Solid state lithium ion conductors and batteries, and methods of making and use thereof

Abstract

The disclosed subject matter relates to solid state lithium ion conductors and batteries (such as pseudo solid state and all solid state batteries), and methods of making and use thereof. For example, disclosed herein are solid state lithium ion conductors comprising: Li3+2x+yzM [III+z]X6-x-yNxOy, wherein M is an alkali metal, an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof; X is a halide; x is from 0 to 6; y is from 0 to 6; z is from -2 to 2; and [III+z] represents the valence of the M-ion(s); with the proviso that: M is not Li; 0 < x + y ≤ 6; and 0 < (3+2z+y-z) ≤ 6. Also disclosed herein are methods of making and use of any of the solid state lithium ion conductors disclosed herein, for example in devices such as a solid state battery.

Description

[0001]11625-006WO1; EX_ID_1038 and 1039 SOLID STATE LITHIUM ION CONDUCTORS AND BATTERIES, AND METHODS OF MAKING AND USE THEREOF CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority to U.S. Provisional Application No. 63 / 530,146 filed August 1, 2023, which is hereby incorporated herein by reference in its entirety. BACKGROUND All-solid-state batteries are considered the next step-change to current lithium-ion batteries owing to its improvement in safety and other performance metrics such as energy density and the ability to fast-charge the battery. There has been significant improvement over the past 15-20 years in the available materials to enable this next-generation technology, namely solid-state electrolytes. However, solid-state electrolytes with improved properties and / or that can be synthesized with inexpensive precursors and manufacturing methods are still needed. The devices, methods, and systems discussed herein address these and other needs. SUMMARY In accordance with the purposes of the disclosed devices, methods, and systems as embodied and broadly described herein, the disclosed subject matter relates to solid state lithium ion conductors and batteries (such as pseudo solid state and all solid state batteries), and methods of making and use thereof. For example, disclosed herein are solid state lithium ion conductors comprising a compound of Formula I: Li3+2x+y-zM[III+z]X6-x-yNxOy I wherein M is an alkali metal, an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof; X is a halide (e.g., F, Cl, Br, I, or a combination thereof); x is from 0 to 6; y is from 0 to 6; z is from -2 to 2; and [III+z] represents the valence of the M-ion(s); with the proviso that: M is not Li; 11625-006WO1; EX_ID_1038 and 1039 the sum of x and y is greater than 0 and less than or equal to 6 (e.g., 0 < x + y ^ 6); and (3+2x+y-z) is greater than 0 and less than or equal to 6 (e.g., 0 < (3+2z+y-z) ^ 6). In some examples of Formula I, M is an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof. In some examples of Formula I, M is a transition metal, a post transition metal, or a combination thereof. In some examples of Formula I, M is a transition metal. In some examples of Formula I, M is Zr. In some examples of Formula I, x is from 0 to 1. In some examples of Formula I, x is from 0 to 0.25. In some examples of Formula I, y is from 0 to 1. In some examples of Formula I, y is from 0.25 to 1. In some examples of Formula I, M is a transition metal and x is from 0 to 1. In some examples of Formula I, M is a transition metal and x is from 0 to 0.25. In some examples of Formula I, M is a transition metal and y is from 0 to 1. In some examples of Formula I, M is a transition metal and y is from 0.25 to 1. In some examples of Formula I, M is Zr and x is from 0 to 1. In some examples of Formula I, M is Zr and x is from 0 to 0.25. In some examples of Formula I, M is Zr and y is from 0 to 1. In some examples of Formula I, M is Zr and y is from 0.25 to 1. In some examples of Formula I, x is from 0 to 1 and y is from 0 to 1. In some examples of Formula I, x is from 0 to 1 and y is from 0.25 to 1. In some examples of Formula I, x is from 0 to 0.25 and y is from 0 to 1. In some examples of Formula I, x is from 0 to 0.25 and y is from 0.25 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 1, and y is from 0 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 1, and y is from 0.25 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 0.25, and y is from 0 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 0.25, and y is from 0.25 to 1. In some examples of Formula I, M is Zr, x is from 0 to 1, and y is from 0 to 1. In some examples of Formula I, M is Zr, x is from 0 to 1, and y is from 0.25 to 1. In some examples of Formula I, M is Zr, x is from 0 to 0.25, and y is from 0 to 1. In some examples of Formula I, M is Zr, x is from 0 to 0.25, and y is from 0.25 to 1. 11625-006WO1; EX_ID_1038 and 1039 In some examples, the solid state lithium ion conductor comprises Li2.25ZrCl5.75O0.25, Li2.5ZrCl5.5O0.5, Li2.7ZrCl5.3O0.7, Li2.75ZrCl5.25O0.75, Li3ZrCl5O, Li3.25ZrCl5N0.25O0.75, Li3.7ZrCl5.35N0.05O0.6, Li2.75ZrCl4.05O0.75F1.2, or a combination thereof. In some examples, the solid state lithium ion conductor comprises Li2.75ZrCl5.25O0.75, Li3.25ZrCl5N0.25O0.75, or a combination thereof. In some examples, the solid state lithium ion conductor has a lithium ion conductivity of from 1 × 10-5Scm-1to 0.1 Scm-1. In some examples, the solid state lithium ion conductor has a lithium ion conductivity of from 0.1 to 1 mS / cm. Also disclosed herein are methods of making any of the solid state lithium ion conductors disclosed herein. In some examples, the methods comprise a mechanochemical synthesis. In some examples, the method comprises combining a plurality of precursors to form a mixture and ball milling the mixture to form the solid state lithium ion conductor. In some examples, the method comprises a two-step ball-milling method. In some examples, the two-step method comprises a first step followed by a second step, the first step comprising planetary ball-milling and the second step comprising high-energy ball milling. In some examples, the methods further comprise a post synthesis thermal treatment, for example to improve the crystallinity of the solid state lithium ion conductor. Also disclosed herein are systems comprising any of the solid state lithium ion conductors disclosed herein. Also disclosed herein are articles comprising any of the solid state lithium ion conductors disclosed herein. Also disclosed herein are devices comprising any of the solid state lithium ion conductors disclosed herein. In some examples, the device is an energy storage device, such as a battery. In some examples, the device is a battery, such as a solid state battery. Also disclosed herein are solid state batteries comprising: a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors disclosed herein (e.g., Formula I); and a composite cathode. The halide solid state electrolyte layer is disposed on and in contact with the composite cathode. The composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. In some examples, the solid state battery further comprises an anode, wherein the halide solid state 11625-006WO1; EX_ID_1038 and 1039 electrolyte layer is sandwiched between and in contact with the anode and the composite cathode. Also disclosed herein are solid state batteries comprising: an anode; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors disclosed herein (e.g., Formula I); and a composite cathode. The halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode. The composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. In some examples, the solid state battery further comprises an interfacial layer comprising an interfacial material. The interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer. The halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode. The anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window, and the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. Also disclosed herein are solid state batteries comprising: an anode; an interfacial layer comprising an interfacial material; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors disclosed herein (e.g., Formula I); and a composite cathode. The interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer. The halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode. The anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window; wherein the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. The composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. In some examples, the interfacial layer is formed in situ. 11625-006WO1; EX_ID_1038 and 1039 In some examples, the interfacial layer has an average thickness of from 1 nanometers (nm) to 100 micrometers (microns, ^m). In some examples, the interfacial layer has an average thickness of from 1 micrometer (micron, ^m) to 20 micrometers. In some examples, the interfacial layer has an ionic conductivity of lithium of from 1 × 10-8Scm-1to 0.1 Scm-1. In some examples, the interfacial material comprises Li6PS5X (where X is Cl, Br, or I), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3xLa2 / 3-xTiO3 (lithium lanthanum titanate (LLTO) perovskite), Li3N, Li3P, Li3PS4, LiBH4, Li2+2xZn1íxGeO4, Li1+xAlxTi2-x(PO4)3(LATP), Li1+xAlxGe2-x(PO4)3 (LAGP), Li10GeP2S12 (LGPS), derivatives thereof (e.g., doped versions thereof), or a combination thereof. In some examples, the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3N, Li3PS4, Li3P, or a combination thereof. In some examples, the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3PS4, or a combination thereof. In some examples, the interfacial layer comprises a plurality of particles of the interfacial material. In some examples, the plurality of particles of the interfacial material have an average particle size of from 1 nanometer (nm) to 25 micrometers (microns, µm). In some examples, the plurality of particles of the interfacial material have an average particle size of from 100 nanometers (nm) to 10 micrometers (microns, µm). In some examples, the anode is formed in situ. In some examples, the anode has a high capacity and / or a high energy density. In some examples, the anode has a specific capacity of from 100 to 4000 mAh / g. In some examples, the anode has a low intercalation voltage. In some examples, the anode has an intercalation voltage of as 1 V or less versus Li+ / Li0. In some examples, the anode comprises a metal, an alloy, an intercalation material, or a combination thereof. In some examples, the anode comprises lithium, silicon, indium, graphite, hard carbon, or a combination thereof. In some examples, the anode comprises lithium (e.g., lithium metal and / or a lithium alloy). In some examples, the anode comprises lithium metal. In some examples, the anode comprises a lithium alloy. In some examples, the anode comprises a lithium-indium alloy, a lithium-magnesium alloy, a lithium-aluminum alloy, a lithium-iron alloy, or a combination thereof. In some examples, the anode comprises a lithium-indium alloy. In some examples, the anode comprises silicon or a silicon composite. In some examples, the anode is a composite (e.g., a composite anode). 11625-006WO1; EX_ID_1038 and 1039 In some examples, the composite anode further includes a binder. In some examples, the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. In some examples, the composite anode further includes a conductive additive. In some examples, the conductive additive comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof. In some examples, the conductive additive comprises carbon black. In some examples, the anode comprises a prelithiated host structure (e.g., a prelithiated silicon anode, a prelithiated silicon-graphite composite anode, a prelithiated graphite, a prelithiated hard carbon, etc.), a silicon-graphite composite anode, or a combination thereof. In some examples, the halide solid state electrolyte layer has an average thickness of from 1 to 100 micrometers (microns, µm). In some examples, the halide solid state electrolyte layer comprises a plurality of particles of the first halide solid state electrolyte. In some examples, the plurality of particles of the first halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 100 micrometers (microns, µm). In some examples, the plurality of particles of the first halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers. In some examples, the electrochemical stability window of the halide solid state electrolyte is compatible with the electrochemical stability window of the composite cathode. In some examples, the cathode active material comprises a high density nickel-rich layered transition metal oxide (e.g., Li[NixMnyCoz]O2 (x+y+z = 1)), LiFe1-xMnxPO4 (LMFP), a lithium iron phosphate (LFP, LiFePO4), lithium manganese oxide (LiMn2O4), nickel-doped lithium manganese oxide (Li[Ni0.5Mn1.5]O4), LiCoO2, LiNiO2, or a combination thereof. In some examples, the cathode active material comprises Li[NixMnyCoz]O2 where x+y+z = 1, LiFePO4, or a combination thereof. In some examples, the conductive additive of the composite cathode comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof. In some examples, the conductive additive of the composite cathode comprises carbon black. 11625-006WO1; EX_ID_1038 and 1039 In some examples, the composite cathode further comprises a binder. In some examples, the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. In some examples, the solid state battery is an all solid state battery. In some examples, the electrolyte of the composite cathode is a plurality of particles comprising a second halide solid state electrolyte. In some examples, the second halide solid state electrolyte has an ionic conductivity of lithium of from 1 × 10-6Scm-1to 1 Scm-1. In some examples, the second halide solid state electrolyte comprises a lithium halide, a sodium halide, or a combination thereof. In some examples, the second halide solid state electrolyte comprises a lithium halide. In some examples, the second halide solid state electrolyte comprises any of the solid state lithium ion conductors disclosed herein (e.g., Formula I). In some examples, the second halide solid state electrolyte comprises Li3-zM[III+z]X6, where X is one or more halides, z is an integer from -2 to 2, and [III+z] represents the valence of the M-ion(s) in the compound. In some examples, the second halide solid state electrolyte and the first halide solid state electrolyte are the same. In some examples, the second halide solid state electrolyte and the first halide solid state electrolyte are different. In some examples, the plurality of particles of second halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 50 micrometers (microns, µm). In some examples, the plurality of particles of second halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers. In some examples, the average particle size of the plurality of particles of the first halide solid state electrolyte and the average particle size of the plurality of particles of the second halide solid state electrolyte are the same. In some examples, the average particle size of the plurality of particles of the first halide solid state electrolyte and the plurality of particles of the second halide solid state electrolyte are different. In some examples, the solid state battery is a pseudo solid state battery. In some examples, the electrolyte of the composite cathode is a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. In some examples, the solid state battery further comprises a first current collector. When the anode is present, the anode is sandwiched between and in contact with the first current collector and the interfacial layer (when present) or the halide solid state electrolyte layer (when 11625-006WO1; EX_ID_1038 and 1039 the interfacial layer is absent). When the anode is absent, the first current collector is in contact with the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent). In some examples, the solid state battery further comprises a second current collector, wherein the cathode is sandwiched between and in contact with the second current collector and the halide solid state electrolyte layer. In some examples, the first current collector and / or the second current collector (when present) independently comprise a metal, a carbon material, or a combination thereof. In some examples, the solid state battery further includes a casing that at least partially surrounds and / or encloses a cell comprising the anode (when present), the interfacial layer (when present), the halide solid state electrolyte layer, the composite cathode, the first current collector (when present), and the second current collector (when present). In some examples, the casing comprises a polymer, a metal, an alloy, a polymer coated metal foil, or a combination thereof. In some examples, the anode is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. In some examples, the interfacial layer is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. In some examples, the solid state battery exhibits an energy density of from 75 Wh / kg to 600 Wh / kg. In some examples, the solid state battery exhibits a specific discharge capacity of from 100 mA h / g to 400 mA h / g when discharged at a rate of from 0.1 C to 10 C. In some examples, the solid state battery is rechargeable. In some examples, the solid state battery exhibits a coulombic efficiency of 80% or more for 100 cycles or more. In some examples, the solid state battery exhibits a coulombic efficiency of 99% or more for 100 cycles or more. In some examples, the solid state battery exhibits a capacity retention of 80% or more for 100 cycles or more. In some examples, the solid state battery exhibits a capacity retention of 90% or more for 100 cycles or more. Also disclosed herein are methods of making any of the solid state batteries disclosed herein. In some examples, the method comprises a dry chemical process in which the cathode and anode (when present) are produced separately and the halide solid state electrolyte material and the interfacial layer (when present) are produced as freestanding films or membranes and the entire cell is sandwiched together. In some examples, the method comprises an iterative wet chemical process where a composite cathode slurry is deposited on the cathode current collector 11625-006WO1; EX_ID_1038 and 1039 and dried, then a slurry comprising the halide solid state electrolyte (and optionally a binding agent) is deposited on the dried cathode and dried, and subsequently the process is repeated for the interfacial layer (when present), before the anode (when present) is placed on top. Also disclosed herein are systems comprising one or more of the solid state batteries disclosed herein. In some examples, the system is an energy storage system. Also disclosed herein are articles comprising one or more of the solid state batteries disclosed herein. In some examples, the article is a vehicle, such as a hybrid electric vehicle or an all-electric vehicle. In some examples, the article comprises an electronic device, such as a portable electronic device, a laptop, a watch, or a cell phone. Additional advantages of the disclosed devices, systems, and methods will be set forth in part in the description which follows, and in part will be obvious from the description. The advantages of the disclosed devices, systems, and methods will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosed devices, systems, and methods, as claimed. The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE FIGURES The accompanying figures, which are incorporated in and constitute a part of this specification, illustrate several aspects of the disclosure, and together with the description, serve to explain the principles of the disclosure. Figure 1. Isometric view of a schematic of the fully crystalline structure for the Li3+2x+y- zM[III+z]X6-x-yNxOy halide solid electrolyte material. The occupancy of each crystallographic position will change with the number of total atoms in the composition. Figure 2. Schematic of the crystalline structure for the Li3+2x+y-zM[III+z]X6-x-yNxOyhalide solid electrolyte material viewed along the a-axis. The occupancy of each crystallographic position will change with the number of total atoms in the composition. Figure 3. Schematic of the crystalline structure for the Li3+2x+y-zM[III+z]X6-x-yNxOy halide solid electrolyte material viewed along the b-axis. The occupancy of each crystallographic position will change with the number of total atoms in the composition. 11625-006WO1; EX_ID_1038 and 1039 Figure 4. Schematic of the crystalline structure for the Li3+2x+y-zM[III+z]X6-x-yNxOy halide solid electrolyte material viewed along the c-axis. The occupancy of each crystallographic position will change with the number of total atoms in the composition. Figure 5. X-ray diffraction pattern of a prepared example halide solid electrolyte material Li2.75ZrCl5.25O0.75 – or Li3+2x+y-zM[III+z]X6-x-yNxOy (x=0, y=0.75, z=1 for Zr4+). Figure 6. X-ray diffraction pattern of a prepared example halide solid electrolyte material Li3.25ZrCl5N0.25O0.75 – or Li3+2x+y-zM[III+z]X6-x-yNxOy (x=0.25, y=0.75, z=1 for Zr4+). Figure 7. Fitted electrochemical impedance spectra of the example halide solid electrolyte materials shown in Figure 5 and Figure 6. These spectra were fit with an equivalent circuit to determine the resistance of the material, which was used to calculate its Li+conductivity provided in Table 1. Figure 8. Equivalent circuit used to fit the electrochemical impedance spectra in Figure 7 and calculate an ionic conductivity. DETAILED DESCRIPTION The devices, methods, and systems described herein may be understood more readily by reference to the following detailed description of specific aspects of the disclosed subject matter and the Examples included therein. Before the present devices, methods, and systems are disclosed and described, it is to be understood that the aspects described below are not limited to specific synthetic methods or specific reagents, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. Also, throughout this specification, various publications are referenced. The disclosures of these publications in their entireties are hereby incorporated by reference into this application in order to more fully describe the state of the art to which the disclosed matter pertains. The references disclosed are also individually and specifically incorporated by reference herein for the material contained in them that is discussed in the sentence in which the reference is relied upon. General Definitions In this specification and in the claims that follow, reference will be made to a number of terms, which shall be defined to have the following meanings. Throughout the description and claims of this specification the word “comprise” and other forms of the word, such as “comprising” and “comprises,” means including but not limited to, and is not intended to exclude, for example, other additives, components, integers, or steps. 11625-006WO1; EX_ID_1038 and 1039 As used in the specification and in the claims, the term “comprising” can include the aspects “consisting of” and “consisting essentially of.” As used in the description and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a composition” includes mixtures of two or more such compositions, reference to “an agent” includes mixtures of two or more such agents, reference to “the component” includes mixtures of two or more such components, and the like. “Optional” or “optionally” means that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where the event or circumstance occurs and instances where it does not. Ranges can be expressed herein as from “about” one particular value, and / or to “about” another particular value. By “about” is meant within 5% of the value, e.g., within 4, 3, 2, or 1% of the value. When such a range is expressed, another aspect includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. Throughout this disclosure, various aspects of the invention can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, a description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, 6 and any whole and partial increments therebetween. This applies regardless of the breadth of the range. When the specific values are disclosed between two end values, it is understood that these end values can also be included. For the terms “for example” and “such as,” and grammatical equivalences thereof, the phrase “and without limitation” is understood to follow unless explicitly stated otherwise. It is further understood that these phrases are used not used in a restrictive sense, but for explanatory purposes. “Exemplary” means “an example of” and is not intended to convey an indication of a preferred or ideal embodiment. 11625-006WO1; EX_ID_1038 and 1039 It is understood that throughout this specification the identifiers “first” and “second” are used solely to aid in distinguishing the various components and steps of the disclosed subject matter. The identifiers “first” and “second” are not intended to imply any particular order, amount, preference, or importance to the components or steps modified by these terms. Spatially relative terms, such as "beneath," "below," "lower," "above," "upper," “bottom,” “top,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein are interpreted accordingly. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements or layers should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," "on" versus "directly on"). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "substantially" means that the subsequently described event or circumstance completely occurs or that the subsequently described event or circumstance generally, typically, or approximately occurs. Still further, the term “substantially” can, in some aspects, refer to at least about 80 %, at least about 85 %, at least about 90 %, at least about 91 %, at least about 92 %, at least about 93 %, at least about 94 %, at least about 95 %, at least about 96 %, at least about 97 %, at least about 98 %, at least about 99 %, or about 100 % of the stated property, component, composition, or other condition for which substantially is used to characterize or otherwise quantify an amount. In other aspects, as used herein, the term “substantially free,” when used in the context of a composition or component of a composition that is substantially absent, is intended to refer to 11625-006WO1; EX_ID_1038 and 1039 an amount that is then about 1 % by weight, e.g., less than about 0.5 % by weight, less than about 0.1 % by weight, less than about 0.05 % by weight, or less than about 0.01 % by weight of the stated material, based on the total weight of the composition. The expressions “ambient temperature” and “room temperature” as used herein are understood in the art and refer generally to a temperature from about 20°C to about 35°C. References in the specification and concluding claims to parts by weight of a particular element or component in a composition denotes the weight relationship between the element or component and any other elements or components in the composition or article for which a part by weight is expressed. Thus, in a mixture containing 2 parts by weight of component X and 5 parts by weight, components Y, X, and Y are present at a weight ratio of 2:5 and are present in such a ratio regardless of whether additional components are contained in the mixture. A weight percent (wt.%) of a component, unless specifically stated to the contrary, is based on the total weight of the formulation or composition in which the component is included. It is understood that the term “salt,” as used herein, refers to a chemical compound that can be formed form a reaction between an acid and a base. It is understood that the term “salt,” as used herein, encompasses both inorganic and organic salts capable of providing the desired properties to the composition. In still further aspects, a cation of the disclosed herein salts is a metal cation. While aspects of the present invention can be described and claimed in a particular statutory class, such as the system statutory class, this is for convenience only and one of ordinary skill in the art will understand that each aspect of the present invention can be described and claimed in any statutory class. Unless otherwise expressly stated, it is in no way intended that any method or aspect set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not specifically state in the claims or descriptions that the steps are to be limited to a specific order, it is in no way intended that an order be inferred in any respect. This holds for any possible non-express basis for interpretation, including matters of logic with respect to the arrangement of steps or operational flow, plain meaning derived from grammatical organization or punctuation, or the number or type of aspects described in the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The organic moieties mentioned when defining variable positions within the general formulae described herein (e.g., the term “halogen”) are collective terms for the individual 11625-006WO1; EX_ID_1038 and 1039 substituents encompassed by the organic moiety. The prefix Cn-Cm preceding a group or moiety indicates, in each case, the possible number of carbon atoms in the group or moiety that follows. The term “ion,” as used herein, refers to any molecule, portion of a molecule, cluster of molecules, molecular complex, moiety, or atom that contains a charge (positive, negative, or both at the same time within one molecule, cluster of molecules, molecular complex, or moiety (e.g., zwitterions)) or that can be made to contain a charge. Methods for producing a charge in a molecule, portion of a molecule, cluster of molecules, molecular complex, moiety, or atom are disclosed herein and can be accomplished by methods known in the art, e.g., protonation, deprotonation, oxidation, reduction, alkylation, acetylation, esterification, de-esterification, hydrolysis, etc. The term “anion” is a type of ion and is included within the meaning of the term “ion.” An “anion” is any molecule, portion of a molecule (e.g., zwitterion), cluster of molecules, molecular complex, moiety, or atom that contains a net negative charge or that can be made to contain a net negative charge. The term “anion precursor” is used herein to specifically refer to a molecule that can be converted to an anion via a chemical reaction (e.g., deprotonation). The term “cation” is a type of ion and is included within the meaning of the term “ion.” A “cation” is any molecule, portion of a molecule (e.g., zwitterion), cluster of molecules, molecular complex, moiety, or atom, that contains a net positive charge or that can be made to contain a net positive charge. The term “cation precursor” is used herein to specifically refer to a molecule that can be converted to a cation via a chemical reaction (e.g., protonation or alkylation). The term “halide” or “halogen” or “halo” as used herein refers to fluorine, chlorine, bromine, and iodine. Solid State Lithium Ion Conductors Disclosed herein are solid state lithium ion conductors. For example, disclosed herein are solid state lithium ion conductor comprising a compound of Formula I: Li3+2x+y-zM[III+z]X6-x-yNxOyI wherein M is an alkali metal, an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof; X is a halide (e.g., F, Cl, Br, I, or a combination thereof); x is from 0 to 6; y is from 0 to 6; 11625-006WO1; EX_ID_1038 and 1039 z is from -2 to 2; and [III+z] represents the valence of the M-ion(s); with the proviso that: M is not Li; the sum of x and y is greater than 0 and less than or equal to 6 (e.g., 0 < (x + y) ^ 6); and (3+2x+y-z) is greater than 0 and less than or equal to 6 (e.g., 0 < (3+2x+y-z) ^ 6). Examples of suitable alkali metals for M include, but are not limited to, Na, K, Rb, Cs, Fr, and combinations thereof. Examples of alkaline earth metals include, but are not limited to, Be, Mg, Ca, Sr, Ba, Ra, and combinations thereof. Examples of transition metals include, but are not limited to, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, and combinations thereof. Examples of post transition metals include, but are not limited to, Al, Ga, In, Sn, Tl, Pb, Bi, Po, and combinations thereof. In some examples of Formula I, M is an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof. In some examples of Formula I, M is a transition metal, a post transition metal, or a combination thereof. In some examples of Formula I, M is a transition metal. In some examples of Formula I, M is Zr. In some examples of Formula I, x is from 0 to 1. In some examples, x is from 0 to 0.25. In some examples of Formula I, y is from 0 to 1. In some examples, y is from 0.25 to 1. In some examples of Formula I, M is a transition metal and x is from 0 to 1. In some examples of Formula I, M is a transition metal and x is from 0 to 0.25. In some examples of Formula I, M is a transition metal and y is from 0 to 1. In some examples of Formula I, M is a transition metal and y is from 0.25 to 1. In some examples of Formula I, M is Zr and x is from 0 to 1. In some examples of Formula I, M is Zr and x is from 0 to 0.25. In some examples of Formula I, M is Zr and y is from 0 to 1. In some examples of Formula I, M is Zr and y is from 0.25 to 1. In some examples of Formula I, x is from 0 to 1 and y is from 0 to 1. In some examples of Formula I, x is from 0 to 1 and y is from 0.25 to 1. In some examples of Formula I, x is from 0 to 0.25 and y is from 0 to 1. In some examples of Formula I, x is from 0 to 0.25 and y is from 0.25 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 1, and y is from 0 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 1, and y is from 0.25 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 0.25, and y is from 0 11625-006WO1; EX_ID_1038 and 1039 to 1. In some examples of Formula I, M is a transition metal, x is from 0 to 0.25, and y is from 0.25 to 1. In some examples of Formula I, M is Zr, x is from 0 to 1, and y is from 0 to 1. In some examples of Formula I, M is Zr, x is from 0 to 1, and y is from 0.25 to 1. In some examples of Formula I, M is Zr, x is from 0 to 0.25, and y is from 0 to 1. In some examples of Formula I, M is Zr, x is from 0 to 0.25, and y is from 0.25 to 1. In some examples, the solid state lithium ion conductor comprises Li2.25ZrCl5.75O0.25, Li2.5ZrCl5.5O0.5, Li2.7ZrCl5.3O0.7, Li2.75ZrCl5.25O0.75, Li3ZrCl5O, Li3.25ZrCl5N0.25O0.75, Li3.7ZrCl5.35N0.05O0.6, Li2.75ZrCl4.05O0.75F1.2, or a combination thereof. In some examples, the solid state lithium ion conductor comprises Li2.75ZrCl5.25O0.75, Li3.25ZrCl5N0.25O0.75, or a combination thereof. In some examples, the solid state lithium ion conductor has a lithium ion conductivity of 1 × 10-5Scm-1or more (e.g., 5 × 10-5Scm-1or more, 1 × 10-4Scm-1or more, 5 × 10-4Scm-1or more, 1 × 10-3Scm-1or more, 5 × 10-3Scm-1or more, 1 × 10-2Scm-1or more, or 5 × 10-2Scm-1or more). In some examples, the solid state lithium ion conductor has a lithium ion conductivity of 0.1 Scm-1or less (e.g., 5 × 10-2Scm-1or less, 1 × 10-2Scm-1or less, 5 × 10-3Scm-1or less, 1 × 10-3Scm-1or less, 5 × 10-4Scm-1or less, 1 × 10-4Scm-1or less, or 5 × 10-5Scm-1or less). The lithium ion conductivity of the solid state lithium ion conductor can range from any of the minimum values described above to any of the maximum values described above. For example, the solid state lithium ion conductor can have a lithium ion conductivity of from 1 × 10-5Scm-1to 0.1 Scm-1(e.g., from 1 × 10-5to 5 × 10-3Scm-1, from 5 × 10-3to 0.1 Scm-1, from 1 × 10-5to 1 × 10-4Scm-1, from 1 × 10-4to 1 × 10-3Scm-1, from 1 × 10-3to 1 × 10-2Scm-1, from 1 × 10-2to 0.1 Scm-1, from 1 × 10-4to 0.1 Scm-1, from 1 × 10-3to 0.1 Scm-1, or from 1 × 10-2to 0.1 Scm-1). In some examples, the solid state lithium ion conductor has a lithium ion conductivity of from 0.1 to 1 mS / cm. The ionic conductivity can be measured using methods known in the art, such as using Electrochemical Impedance Spectroscopy (EIS) and then calculated with an ionic conductivity equation. Methods of Making and Use of Solid State Lithium Ion Conductors Also disclosed herein are methods of making any of the solid state lithium ion conductors described herein. For example, the method comprises a mechanochemical synthesis. In some examples, the method comprises combining a plurality of precursors to form a mixture and ball milling the mixture to form the solid state lithium ion conductor. 11625-006WO1; EX_ID_1038 and 1039 In some examples, the method comprises a two-step ball-milling method. In some examples, the two-step method comprises a first step followed by a second step, the first step comprising planetary ball-milling and the second step comprising high-energy ball milling. In some examples, the method further comprises a post synthesis thermal treatment, for example to improve the crystallinity of the solid state lithium ion conductor. Also disclosed herein are methods of use of any of the solid state lithium ion conductors described herein. For example, also disclosed herein are methods of use of any of the solid state lithium ion conductors described herein, for example in a system, an article, and / or a device. Also disclosed herein are systems, articles, and / or devices comprising any of the solid state lithium ion conductors disclosed herein. For example, the device can be an energy storage device, such as a battery. In some examples, the device is a battery, such as a solid state battery. Solid State Batteries Disclosed herein are solid state batteries, such as pseudo solid state and all solid state batteries, comprising any of the halide solid state electrolytes described herein. For example, disclosed herein are solid state batteries comprising: a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors described herein (e.g., Formula I); and a composite cathode. The halide solid state electrolyte layer is disposed on and in contact with the composite cathode. In some examples, the solid state battery further comprises an anode, and the halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode. In some examples, the anode is formed in situ (e.g. the anode is plated in situ during cycling). For example, disclosed herein are solid state batteries comprising: an anode; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors described herein (e.g., Formula I); and a composite cathode. The halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode. In some examples, the solid state batteries further comprise an interfacial layer comprising an interfacial material, wherein the interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer and the halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode. The anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window, and the electrochemical 11625-006WO1; EX_ID_1038 and 1039 stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. Also disclosed herein are solid state batteries comprising an anode, an interfacial layer comprising an interfacial material, a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors described herein (e.g., Formula I), and a composite cathode. The interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer. The halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode. The anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window, and the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. Anode The solid state batteries disclosed herein comprise an anode. The anode can comprise any suitable material, such as those known in the art. In some examples, the anode is formed in situ (e.g., the anode is plated in situ during cycling). In some examples, the anode has a high capacity and / or a high energy density. For example, the anode has a specific capacity of 100 mAh / g or more (e.g., 125 mAh / g or more, 150 mAh / g or more, 175 mAh / g or more, 200 mAh / g or more, 225 mAh / g or more, 250 mAh / g or more, 300 mAh / g or more, 350 mAh / g or more, 400 mAh / g or more, 450 mAh / g or more, 500 mAh / g or more, 600 mAh / g or more, 700 mAh / g or more, 800 mAh / g or more, 900 mAh / g or more, 1000 mAh / g or more, 1250 mAh / g or more, 1500 mAh / g or more, 1750 mAh / g or more, 2000 mAh / g or more, 2250 mAh / g or more, 2500 mAh / g or more, 2750 mAh / g or more, 3000 mAh / g or more, 3250 mAh / g or more, 3500 mAh / g or more, or 3750 mAh / g or more). In some examples, the anode can have a specific capacity of 4000 mAh / g or less (e.g., 3750 mAh / g or less, 3500 mAh / g or less, 3250 mAh / g or less, 3000 mAh / g or less, 2750 mAh / g or less, 2500 mAh / g or less, 2250 mAh / g or less, 2000 mAh / g or less, 1750 mAh / g or less, 1500 mAh / g or less, 1250 mAh / g or less, 1000 mAh / g or less, 900 mAh / g or less, 800 mAh / g or less, 700 mAh / g or less, 600 mAh / g or less, 500 mAh / g or less, 450 mAh / g or less, 400 mAh / g or less, 350 mAh / g or less, 300 mAh / g or less, 250 mAh / g or less, 225 mAh / g or less, 200 mAh / g or less, 175 mAh / g or less, 150 mAh / g or less, or 125 mAh / g or less). The specific capacity of the anode can range from any of the minimum values described above to any of the maximum 11625-006WO1; EX_ID_1038 and 1039 values described above. For example, the anode can have a specific capacity of from 100 to 4000 mAh / g (e.g., from 100 to 2000 mAh / g, from 2000 to 4000 mAh / g, from 100 to 1000 mAh / g, from 1000 to 2000 mAh / g, from 2000 to 3000 mAh / g, from 3000 to 4000 mAh / g, from 100 to 3500 mAh / g, from 100 to 3000 mAh / g, from 100 to 2500 mAh / g, from 100 to 1500 mAh / g, from 100 to 750 mAh / g, from 500 to 4000 mAh / g, from 750 to 4000 mAh / g, from 1000 to 4000 mAh / g, from 1500 to 4000 mAh / g, from 2500 to 4000 mAh / g, from 250 to 3750 mAh / g, from 500 to 3500 mAh / g, from 750 to 3250 mAh / g, or from 1000 to 3000 mAh / g). The specific capacity of the anode can be calculated and / or theoretical. The specific capacity of the anode can be measured using methods known in the art, such as in an electrochemical cell, similar to charge / discharge cycling of a battery, for example using Galvanostatic cycling. In some examples, the anode has a low intercalation voltage. For example, the anode can have an intercalation voltage of 1 V or less versus Li+ / Li0(e.g., 0.95 V or less, 0.9 V or less, 0.85 V or less, 0.8 V or less, 0.75 V or less, 0.7 V or less, 0.65 V or less, 0.6 V or less, 0.55 V or less, 0.5 V or less, 0.45 V or less, 0.4 V or less, 0.35 V or less, 0.3 V or less, 0.25 V or less, 0.2 V or less, 0.15 V or less, 0.1 V or less, or 0.05 V or less). In some examples, the anode comprises a metal, an alloy, an intercalation material, or a combination thereof. For example, the anode can comprise lithium, silicon, indium, graphite, hard carbon, or a combination thereof. In some examples, the anode comprises lithium (e.g., lithium metal and / or a lithium alloy). In some examples, the anode comprises lithium metal. In some examples, the anode comprises a lithium alloy, such as a lithium-indium alloy, a lithium-magnesium alloy, a lithium- aluminum alloy, a lithium-iron alloy, or a combination thereof. In some examples, the anode comprises a lithium-indium alloy. In some examples, the anode comprises silicon or a silicon composite. In some examples, the anode is a composite (e.g., a composite anode). In some examples, the composite anode further includes a binder. Examples of suitable binders are known in the art. For example, the binder can comprise a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. In some examples, the composite anode further includes a conductive additive. The conductive additive can comprise any suitable material, such as those known in the art. Examples of suitable conductive additives include, but are not limited to, carbon black, modified 11625-006WO1; EX_ID_1038 and 1039 carbon black, graphene, multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, reduced graphene oxide, and combinations thereof. In some examples, the conductive additive comprises carbon black. In some examples, the anode comprises a prelithiated host structure anode (e.g., a prelithiated silicon anode, a prelithiated silicon-graphite composite anode, a prelithiated graphite, a prelithiated hard carbon, etc.), a silicon-graphite composite anode, or a combination thereof. Interfacial Layer In some examples, the solid state batteries disclosed herein further comprise an interfacial layer. Without wishing to be bound by theory, the inclusion of the interfacial layer can overcome the instability of the halide solid state electrolyte layer with the anode (e.g., lithium metal anode) to enable an all-solid-state battery with a halide solid state electrolyte. For example, the integration of the interfacial layer between the halide solid state electrolyte and the anode can stabilize the interface for extended duration and plating / stripping of the anode. The interfacial layer can comprise any suitable material. For example, the interfacial layer can comprise any material such that the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. In some examples, the interfacial layer can be formed in situ from a precursor layer. For example, the precursor layer can comprise a material that reacts (e.g., with the anode) during cycling to form the interfacial layer. Examples of suitable interfacial materials include, but are not limited to, Li6PS5X (where X is Cl, Br, or I), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3xLa2 / 3-xTiO3 (lithium lanthanum titanate (LLTO) perovskite), Li3N, Li3P, Li3PS4, LiBH4, Li2+2xZn1íxGeO4, Li1+xAlxTi2-x(PO4)3 (LATP), Li1+xAlxGe2-x(PO4)3 (LAGP), Li10GeP2S12 (LGPS), derivatives thereof (e.g., doped versions thereof), or a combination thereof. In some examples, the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3N, Li3PS4, Li3P, or a combination thereof. In some examples, the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3PS4, or a combination thereof. In some examples, the interfacial layer has an ionic conductivity of lithium of 1 × 10-8Scm-1or more (e.g., 5 × 10-8Scm-1or more, 1 × 10-7Scm-1or more, 5 × 10-7Scm-1or more, 1 × 10-6Scm-1or more, 5 × 10-6Scm-1or more, 1 × 10-5Scm-1or more, 5 × 10-5Scm-1or more, 1 × 10-4Scm-1or more, 5 × 10-4Scm-1or more, 1 × 10-3Scm-1or more, 5 × 10-3Scm-1or more, 1 × 10-2Scm-1or more, or 5 × 10-2Scm-1or more). In some examples, the interfacial layer has an 11625-006WO1; EX_ID_1038 and 1039 ionic conductivity of lithium of 0.1 Scm-1or less (e.g., 5 × 10-2Scm-1or less, 1 × 10-2Scm-1or less, 5 × 10-3Scm-1or less, 1 × 10-3Scm-1or less, 5 × 10-4Scm-1or less, 1 × 10-4Scm-1or less, 5 × 10-5Scm-1or less, 1 × 10-5Scm-1or less, 5 × 10-6Scm-1or less, 1 × 10-6Scm-1or less, 5 × 10-7Scm-1or less, 1 × 10-7Scm-1or less, or 5 × 10-8Scm-1or less). The ionic conductivity of lithium of the interfacial layer can range from any of the minimum values described above to any of the maximum values described above. For example, the interfacial layer can have an ionic conductivity of lithium of from 1 × 10-8Scm-1to 0.1 Scm-1(e.g., from 1 × 10-8to 5 × 10-4Scm-1, from 5 × 10-4to 0.1 Scm-1, from 1 × 10-8to 5 × 10-7Scm-1, from 5 × 10-7to 1 × 10-5Scm-1, from 1 × 10-5to 5 × 10-3Scm-1, from 5 × 10-3to 0.1 Scm-1, 1 × 10-7to 0.1 Scm-1, from 1 × 10-6to 0.1 Scm-1, from 1 × 10-5to 0.1 Scm-1, from 1 × 10-4to 0.1 Scm-1, from 1 × 10-3to 0.1 Scm-1, or from 1 × 10-2to 0.1 Scm-1). The ionic conductivity of the interfacial layer can be measured using methods known in the art, such as using Electrochemical Impedance Spectroscopy (EIS) and then calculated with an ionic conductivity equation. In some examples, the interfacial layer can have an average thickness of 1 nanometer (nm) or more (e.g., 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 60 nm or more, 70 nm or more, 80 nm or more, 90 nm or more, 100 nm or more, 125 nm or more, 150 nm or more, 175 nm or more, 200 nm or more, 225 nm or more, 250 nm or more, 300 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 600 nm or more, 700 nm or more, 800 nm or more, 900 nm or more, 1 micrometer (micron, ^m) or more, 1.25 ^m or more, 1.5 ^m or more, 1.75 ^m or more, 2 ^m or more, 2.25 ^m or more, 2.5 ^m or more, 3 ^m or more, 3.5 ^m or more, 4 ^m or more, 4.5 ^m or more, 5 ^m or more, 6 ^m or more, 7 ^m or more, 8 ^m or more, 9 ^m or more, 10 ^m or more, 15 ^m or more, 20 ^m or more, 25 ^m or more, 30 ^m or more, 35 ^m or more, 40 ^m or more, 45 ^m or more, 50 ^m or more, 60 ^m or more, 70 ^m or more, 80 ^m or more, or 90 ^m or more). In some examples, the interfacial layer can have an average thickness of 100 micrometers (microns, ^m) or less (e.g., 90 ^m or less, 80 ^m or less, 70 ^m or less, 60 ^m or less, 50 ^m or less, 45 ^m or less, 40 ^m or less, 35 ^m or less, 30 ^m or less, 25 ^m or less, 20 ^m or less, 15 ^m or less, 10 ^m or less, 9 ^m or less, 8 ^m or less, 7 ^m or less, 6 ^m or less, 5 ^m or less, 4.5 ^m or less, 4 ^m or less, 3.5 ^m or less, 3 ^m or less, 2.5 ^m or less, 2.25 ^m or less, 2 ^m or less, 1.75 ^m or less, 1.5 ^m or less, 1.25 ^m or less, 1 ^m or less, 900 nanometers (nm) or less, 800 nm or less, 700 nm or less, 600 nm or less, 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 250 nm or less, 225 nm or less, 200 nm or less, 175 nm or less, 150 nm or less, 125 nm or less, 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, 50 nm or less, 45 nm or less, 40 11625-006WO1; EX_ID_1038 and 1039 nm or less, 35 nm or less, 30 nm or less, 25 nm or less, 20 nm or less, 15 nm or less, 10 nm or less, or 5 nm or less). The average thickness of the interfacial layer can range from any of the minimum values described above to any of the maximum values described above. For example, the interfacial layer can have an average thickness of from 1 nanometer (nm) to 100 micrometers (microns, ^m) (e.g., from 1 nm to 1 ^m, from 1 ^m to 100 ^m, from 1 nm to 10 nm, from 10 nm to 100 nm, from 100 nm to 1 ^m, from 1 ^m to 10 ^m, from 10 ^m to 100 ^m, from 1 nm to 75 ^m, from 1 nm to 50 ^m, from 1 nm to 25 ^m, from 1 nm to 10 ^m, from 1 nm to 1 ^m, from 1 nm to 100 nm, from 1 nm to 50 nm, from 1 nm to 25 nm, from 10 nm to 100 ^m, from 25 nm to 100 ^m, from 50 nm to 100 ^m, from 100 nm to 100 ^m, from 1 ^m to 100 ^m, from 10 ^m to 100 ^m, from 25 ^m to 100 ^m, from 50 ^m to 100 ^m, from 5 nm to 95 ^m, from 10 nm to 90 ^m, from 25 nm to 75 ^m, from 50 nm to 50 ^m, from 75 nm to 25 ^m, from 1 µm to 20 µm, or from 100 nm to 1 ^m). In some examples, the interfacial layer has an average thickness of from 1 micrometer (micron, ^m) to 20 micrometers. The thickness of the interfacial layer can be measured using methods known in the art, such as evaluation by electron microscopy (e.g., scanning electron microscopy, transmission electron microscopy, or a combination thereof) and / or dynamic light scattering. As used herein, the average thickness of the interfacial layer is determined by scanning electron microscopy. In some examples, the interfacial layer can comprises a plurality of particles of the interfacial material. The plurality of particles of the interfacial material can comprise particles of any shape desired for the specific application (e.g., a sphere, a rod, a quadrilateral, an ellipse, a triangle, a polygon, etc.). In some examples, the plurality of particles of the interfacial material can have an irregular shape, a regular shape, an isotropic shape, an anisotropic shape, or a combination thereof. In some examples, the plurality of particles of the interfacial material can have an isotropic shape. In some examples, the plurality of particles of the interfacial material are substantially spherical. The plurality of particles of the interfacial material can have an average particle size. “Average particle size” and “mean particle size” are used interchangeably herein, and generally refer to the statistical mean particle size of the particles in a population of particles. For example, the average particle size for a plurality of particles with a substantially spherical shape can comprise the average diameter of the plurality of particles. For a particle with a substantially spherical shape, the diameter of a particle can refer, for example, to the hydrodynamic diameter. As used herein, the hydrodynamic diameter of a particle can refer to the largest linear distance between two points on the surface of the particle. For an anisotropic particle, the average particle 11625-006WO1; EX_ID_1038 and 1039 size can refer to, for example, the average maximum dimension of the particle (e.g., the length of a rod shaped particle, the diagonal of a cube shape particle, the bisector of a triangular shaped particle, etc.). For an anisotropic particle, the average particle size can refer to, for example, the hydrodynamic size of the particle. Mean particle size can be measured using methods known in the art, such as evaluation by electron microscopy (e.g., scanning electron microscopy, transmission electron microscopy, or a combination thereof) and / or dynamic light scattering. As used herein, the average particle size is determined by scanning electron microscopy. In some examples, the plurality of particles of the interfacial material can have an average particle size of 1 nanometer (nm) or more (e.g., 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 60 nm or more, 70 nm or more, 80 nm or more, 90 nm or more, 100 nm or more, 125 nm or more, 150 nm or more, 175 nm or more, 200 nm or more, 225 nm or more, 250 nm or more, 300 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 600 nm or more, 700 nm or more, 800 nm or more, 900 nm or more, 1 micrometer (micron, ^m) or more, 1.25 ^m or more, 1.5 ^m or more, 1.75 ^m or more, 2 ^m or more, 2.25 ^m or more, 2.5 ^m or more, 3 ^m or more, 3.5 ^m or more, 4 ^m or more, 4.5 ^m or more, 5 ^m or more, 6 ^m or more, 7 ^m or more, 8 ^m or more, 9 ^m or more, 10 ^m or more, 15 ^m or more, or 20 ^m or more). In some examples, the plurality of particles of the interfacial material can have an average particle size of 25 micrometers (microns, µm) or less (e.g., 20 ^m or less, 15 ^m or less, 10 ^m or less, 9 ^m or less, 8 ^m or less, 7 ^m or less, 6 ^m or less, 5 ^m or less, 4.5 ^m or less, 4 ^m or less, 3.5 ^m or less, 3 ^m or less, 2.5 ^m or less, 2.25 ^m or less, 2 ^m or less, 1.75 ^m or less, 1.5 ^m or less, 1.25 ^m or less, 1 ^m or less, 900 nanometers (nm) or less, 800 nm or less, 700 nm or less, 600 nm or less, 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 250 nm or less, 225 nm or less, 200 nm or less, 175 nm or less, 150 nm or less, 125 nm or less, 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, 50 nm or less, 45 nm or less, 40 nm or less, 35 nm or less, 30 nm or less, 25 nm or less, 20 nm or less, 15 nm or less, 10 nm or less, or 5 nm or less). The average particle size of the plurality of particles of the interfacial material can range from any of the minimum values described above to any of the maximum values described above. For example, the plurality of particles of the interfacial material can have an average particle size of from 1 nanometers (nm) to 25 micrometers (microns, ^m) (e.g., from 1 nm to 100 nm, from 100 nm to 25 ^m, from 1 nm to 10 nm, from 10 nm to 100 nm, from 100 nm to 1 ^m, from 1 ^m to 10 ^m, from 10 ^m to 25 ^m, from 1 nm to 20 ^m, from 1 nm to 10 ^m, from 1 nm to 1 ^m, from 1 nm to 100 nm, from 1 nm to 50 nm, from 1 nm to 25 nm, from 10 nm to 25 ^m, from 25 nm to 25 11625-006WO1; EX_ID_1038 and 1039 ^m, from 50 nm to 25 ^m, from 100 nm to 25 ^m, from 1 ^m to 25 ^m, from 5 ^m to 25 ^m, from 10 ^m to 25 ^m, from 10 nm to 20 ^m, from 50 nm to 15 ^m, from 100 nm to 10 ^m, or from 1 to 10 ^m). In some examples, the plurality of particles of the interfacial material can have an average particle size of from 100 nanometers (nm) to 10 micrometers (microns, µm). In some examples, the plurality of particles of the interfacial material can be substantially monodisperse. “Monodisperse” and “homogeneous size distribution,” as used herein, and generally describe a population of particles where all of the particles are the same or nearly the same size. As used herein, a monodisperse distribution refers to particle distributions in which 80% of the distribution (e.g., 85% of the distribution, 90% of the distribution, or 95% of the distribution) lies within 25% of the average particle size (e.g., within 20% of the average particle size, within 15% of the average particle size, within 10% of the average particle size, or within 5% of the average particle size). In some examples, the plurality of particles of the interfacial material can comprise: a first population of particles having a first average particle size, a first particle shape, and a first composition; and a second population of particles having a second average particle size, a second particle shape, and a second composition; wherein the first average particle size and the second average particle size are different, the first particle shape and the second particle shape are different, the first composition and the second composition are different, or a combination thereof. In some examples, the plurality of particles of the interfacial material can comprise a mixture of a plurality of populations of particles, wherein each population of particles within the mixture is different with respect to average particle size, shape, composition, or a combination thereof. Halide Solid State Electrolyte Layer The solid state batteries further comprise a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is any of the solid state lithium ion conductors described herein (e.g., Formula I). In some examples, the halide solid state electrolyte layer has an average thickness of 1 micrometer (micron, ^m) or more (e.g., 5 ^m or more, 10 ^m or more, 15 ^m or more, 20 ^m or more, 25 ^m or more, 30 ^m or more, 35 ^m or more, 40 ^m or more, 45 ^m or more, 50 ^m or more, 55 ^m or more, 60 ^m or more, 65 ^m or more, 70 ^m or more, 75 ^m or more, 80 ^m or more, 85 ^m or more, 90 ^m or more, or 95 ^m or more). In some examples, the halide solid state electrolyte layer can have an average thickness of 100 micrometers (microns, ^m) or less (e.g., 95 ^m or less, 90 ^m or less, 85 ^m or less, 80 ^m or less, 75 ^m or less, 70 ^m or less, 65 11625-006WO1; EX_ID_1038 and 1039 ^m or less, 60 ^m or less, 55 ^m or less, 50 ^m or less, 45 ^m or less, 40 ^m or less, 35 ^m or less, 30 ^m or less, 25 ^m or less, 20 ^m or less, 15 ^m or less, 10 ^m or less, or 5 ^m or less). The average thickness of the halide solid state electrolyte layer can range from any of the minimum values described above to any of the maximum values described above. For example, the halide solid state electrolyte layer can have an average thickness of from 1 to 100 micrometers (microns, ^m) (e.g., from 1 to 50 ^m, from 50 to 100 ^m, from 1 to 20 ^m, from 20 to 40 ^m, from 40 to 60 ^m, from 60 to 80 ^m, from 80 to 100 ^m, from 1 to 80 ^m, from 1 to 60 ^m, from 1 to 40 ^m, from 1 to 10 ^m, from 5 to 100 ^m, from 10 to 100 ^m, from 20 to 100 ^m, from 40 to 100 ^m, from 60 to 100 ^m, from 5 to 95 ^m, from 10 to 90 ^m, or from 20 to 80 ^m). The thickness of the halide solid state electrolyte layer can be measured using methods known in the art, such as evaluation by electron microscopy (e.g., scanning electron microscopy, transmission electron microscopy, or a combination thereof) and / or dynamic light scattering. As used herein, the average thickness of the halide solid state electrolyte layer is determined by scanning electron microscopy. In some examples, the halide solid state electrolyte layer comprises a plurality of particles of the first halide solid state electrolyte. The plurality of particles of the first halide solid state electrolyte can comprise particles of any shape desired for the specific application (e.g., a sphere, a rod, a quadrilateral, an ellipse, a triangle, a polygon, etc.). In some examples, the plurality of particles of the first halide solid state electrolyte can have an irregular shape, a regular shape, an isotropic shape, an anisotropic shape, or a combination thereof. In some examples, the plurality of particles of the first halide solid state electrolyte can have an isotropic shape. In some examples, the plurality of particles of the first halide solid state electrolyte are substantially spherical. The plurality of particles of the first halide solid state electrolyte can have an average particle size. For example, the plurality of particles of the first halide solid state electrolyte can have an average particle size of 1 nanometer (nm) or more (e.g., 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 60 nm or more, 70 nm or more, 80 nm or more, 90 nm or more, 100 nm or more, 125 nm or more, 150 nm or more, 175 nm or more, 200 nm or more, 225 nm or more, 250 nm or more, 300 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 600 nm or more, 700 nm or more, 800 nm or more, 900 nm or more, 1 micrometer (micron, ^m) or more, 1.25 ^m or more, 1.5 ^m or more, 1.75 ^m or more, 2 ^m or more, 2.25 ^m or more, 2.5 ^m or more, 3 ^m or more, 3.5 ^m or more, 4 ^m or more, 4.5 ^m or more, 5 ^m or more, 6 ^m or more, 7 ^m or more, 8 ^m or more, 9 ^m or more, 10 ^m or more, 15 ^m 11625-006WO1; EX_ID_1038 and 1039 or more, 20 ^m or more, 25 ^m or more, 30 ^m or more, 35 ^m or more, 40 ^m or more, 45 ^m or more, 50 ^m or more, 60 ^m or more, 70 ^m or more, 80 ^m or more, or 90 ^m or more). In some examples, the plurality of particles of the first halide solid state electrolyte can have an average particle size of 100 micrometers (microns, µm) or less (e.g., 90 ^m or less, 80 ^m or less, 70 ^m or less, 60 ^m or less, 50 ^m or less, 45 ^m or less, 40 ^m or less, 35 ^m or less, 30 ^m or less, 25 ^m or less, 20 ^m or less, 15 ^m or less, 10 ^m or less, 9 ^m or less, 8 ^m or less, 7 ^m or less, 6 ^m or less, 5 ^m or less, 4.5 ^m or less, 4 ^m or less, 3.5 ^m or less, 3 ^m or less, 2.5 ^m or less, 2.25 ^m or less, 2 ^m or less, 1.75 ^m or less, 1.5 ^m or less, 1.25 ^m or less, 1 ^m or less, 900 nanometers (nm) or less, 800 nm or less, 700 nm or less, 600 nm or less, 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 250 nm or less, 225 nm or less, 200 nm or less, 175 nm or less, 150 nm or less, 125 nm or less, 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, 50 nm or less, 45 nm or less, 40 nm or less, 35 nm or less, 30 nm or less, 25 nm or less, 20 nm or less, 15 nm or less, 10 nm or less, or 5 nm or less). The average particle size of the plurality of particles of the first halide solid state electrolyte can range from any of the minimum values described above to any of the maximum values described above. For example, the plurality of particles of the first halide solid state electrolyte can have an average particle size of from 1 nanometers (nm) to 100 micrometers (microns, ^m) (e.g., from 1 nm to 1 ^m, from 1 ^m to 100 ^m, from 1 nm to 10 nm, from 10 nm to 100 nm, from 100 nm to 1 ^m, from 1 ^m to 10 ^m, from 10 ^m to 100 ^m, from 1 nm to 75 ^m, from 1 nm to 50 ^m, from 1 nm to 25 ^m, from 1 nm to 10 ^m, from 1 nm to 1 ^m, from 1 nm to 100 nm, from 1 nm to 50 nm, from 1 nm to 25 nm, from 10 nm to 100 ^m, from 25 nm to 100 ^m, from 50 nm to 100 ^m, from 100 nm to 100 ^m, from 1 ^m to 100 ^m, from 10 ^m to 100 ^m, from 25 ^m to 100 ^m, from 50 ^m to 100 ^m, from 5 nm to 95 ^m, from 10 nm to 90 ^m, from 25 nm to 75 ^m, from 50 nm to 50 ^m, from 75 nm to 25 ^m, from 100 nm to 20 ^m , or from 100 nm to 10 ^m). In some examples, the plurality of particles of the first halide solid state electrolyte can have an average particle size of from 100 nanometers to 20 micrometers. In some examples, the plurality of particles of the first halide solid state electrolyte can be substantially monodisperse. In some examples, the plurality of particles of the first halide solid state electrolyte can comprise: a first population of particles having a first average particle size, a first particle shape, and a first composition; and a second population of particles having a second average particle size, a second particle shape, and a second composition; wherein the first average particle size and the second average particle size are different, the first particle shape and the second particle shape are different, the first composition and the second composition are different, or a 11625-006WO1; EX_ID_1038 and 1039 combination thereof. In some examples, the plurality of particles of the first halide solid state electrolyte can comprise a mixture of a plurality of populations of particles, wherein each population of particles within the mixture is different with respect to average particle size, shape, composition, or a combination thereof. In some examples, the electrochemical stability window of the halide solid state electrolyte layer is compatible with the electrochemical stability window of the composite cathode. In some examples, the electrochemical stability window of the halide solid state electrolyte layer overlaps with the electrochemical stability window of the interfacial layer and the electrochemical stability window of the composite cathode. In some examples, the halide solid state electrolyte layer is high-voltage stable. For example, the halide solid state electrolyte layer can be stable at a voltage of -0.1 V or more vs. Li+ / Li0(e.g., 0 V or more, 0.5 V or more, 1 V or more, 1.5 V or more, 2 V or more, 2.5 V or more, 3 V or more, 3.5 V or more, 4 V or more, 4.5 V or more, or 5 V or more). In some examples, the halide solid state electrolyte layer can be stable at a voltage of 5.5 V or less vs. Li+ / Li0(e.g., 5 V or less, 4.5 V or less, 4 V or less, 3.5 V or less, 3 V or less, 2.5 V or less, 2 V or less, 1.5 V or less, 1 V or less, 0.5 V or less, or 0 V or less). The voltage at which the halide solid state electrolyte layer is stable can range from any of the minimum values described above to any of the maximum values described above. For example, the halide solid state electrolyte layer can be stable at a voltage of from -0.1 V to 5.5 V vs. Li+ / Li0(e.g., from -0.1 to 2.5 V, from 2.5 to 5.5 V, from -0.1 to 5 V, from -0.1 to 4.5 V, from -0.1 to 4 V, from -0.1 to 3.5 V, from -0.1 to 3 V, from -0.1 to 2.5 V, from -0.1 to 2 V, from -0.1 to 1.5 V, from -0.1 to 1 V, from 0 to 5.5 V, from 0.5 to 5.5 V, from 1 to 5.5 V, from 1.5 to 5.5 V, from 2 to 5.5 V, from 2.5 to 5.5 V, from 3 to 5.5 V, from 3.5 to 5.5 V, from 4 to 5.5 V, from 0 to 5 V, or from 1 to 5 V). As used herein, “stable” means mean no reaction occur or a reaction occurs that is favorable for lithium-transport (e.g., Li-ion conducting reaction products). Composite Cathode The solid state batteries further comprise a composite cathode. The composite cathode comprises a cathode active material, a conductive additive, and an electrolyte. The electrolyte of the composite cathode comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. Cathode Active Material The cathode active material can comprise any suitable material, such as those known in the art. Examples of suitable cathode active materials include, but are not limited to, high density nickel-rich layered transition metal oxides (e.g., Li[NixMnyCoz]O2 (x+y+z = 1)), LiFe1-xMnxPO4 11625-006WO1; EX_ID_1038 and 1039 (LMFP), lithium iron phosphate (LFP, LiFePO4), lithium manganese oxide (LiMn2O4), nickel- doped lithium manganese oxide (Li[Ni0.5Mn1.5]O4), LiCoO2, LiNiO2, and combinations thereof. In some examples, the cathode active material comprises Li[NixMnyCoz]O2 where x+y+z = 1, LiFePO4, or a combination thereof. In some examples, the cathode active material comprises Li[NixMnyCoz]O2 where x+y+z = 1. Conductive Additive The conductive additive can comprise any suitable material, such as those known in the art. Examples of suitable conductive additives include, but are not limited to, carbon black, modified carbon black, graphene, multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, reduced graphene oxide, and combinations thereof. In some examples, the conductive additive comprises carbon black. Binder In some examples, the composite cathode further comprises a binder. Examples of suitable binders are known in the art. For example, the binder can comprise a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. Cathode Electrolyte In some examples, the solid state battery is a pseudo solid state battery. In some examples, the solid state battery is a pseudo solid state battery and the electrolyte of the composite cathode is a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. In some examples, the solid state battery is an all solid state battery. In some examples, the solid state battery is an all solid state battery and the electrolyte of the composite cathode is a plurality of particles comprising a second halide solid state electrolyte. The second halide solid state electrolyte can comprise any suitable material, such as those known in the art. Examples of suitable materials for the second halide solid state electrolyte include, but are not limited to, lithium halides, sodium halides, or a combination thereof. In some examples, the second halide solid state electrolyte comprises a lithium halide. In some examples, the second halide solid state electrolyte comprises any of the solid state lithium ion conductors described herein (e.g., Formula I). In some examples, the second halide solid state electrolyte comprises Li3-zM[III+z]X6, where X is one or more halides (e.g., F, Cl, Br, I, or a combination thereof), z is an integer from - 2 to 2 (e.g., z is -2, -1, 0, 1, or 2), and [III+z] represents the valence of the M-ion(s) in the 11625-006WO1; EX_ID_1038 and 1039 compound. In some examples, M can be a metal, such as a transition metal, a post transition metal, or a combination thereof. In some examples, M can be Y, Zr, In, or a combination thereof. In some examples, M can be Y and / or Zr. In some examples, the second halide solid state electrolyte can comprise Li3YX6, where X is F, Cl, Br, I, or a combination thereof. In some examples, the second halide solid state electrolyte can comprise Li2ZrX6, where X is F, Cl, Br, I, or a combination thereof. In some examples, the second halide solid state electrolyte comprises Li3YCl6, Li2ZrCl6, or a combination thereof. The second halide solid state electrolyte and the first halide solid state electrolyte can be the same or different. In some examples, the second halide solid state electrolyte can have an ionic conductivity of lithium of 1 × 10-6Scm-1or more (e.g., 5 × 10-6Scm-1or more, 1 × 10-5Scm-1or more, 5 × 10-5Scm-1or more, 1 × 10-4Scm-1or more, 5 × 10-4Scm-1or more, 1 × 10-3Scm-1or more, 5 × 10-3Scm-1or more, 1 × 10-2Scm-1or more, 5 × 10-2Scm-1or more, 0.1 Scm-1or more, or 0.5 Scm-1or more). In some examples, the second halide solid state electrolyte can have an ionic conductivity of lithium of 1 Scm-1or less (e.g., 0.5 Scm-1or less, 0.1 Scm-1or less, 5 × 10-2Scm-1or less, 1 × 10-2Scm-1or less, 5 × 10-3Scm-1or less, 1 × 10-3Scm-1or less, 5 × 10-4Scm-1or less, 1 × 10-4Scm-1or less, 5 × 10-5Scm-1or less, 1 × 10-5Scm-1or less, or 5 × 10-6Scm-1or less). The ionic conductivity of lithium of the second halide solid state electrolyte can range from any of the minimum values described above to any of the maximum values described above. For example, the second halide solid state electrolyte can have an ionic conductivity of lithium of from 1 × 10-6Scm-1to 1 Scm-1(e.g., from 1 × 10-6to 1 × 10-3Scm-1, from 1 × 10-3to 1 Scm-1, from 1 × 10-6to 1 × 10-5Scm-1, from 1 × 10-5to 1 × 10-4Scm-1, from 1 × 10-4to 1 × 10-3Scm-1, from 1 × 10-3to 1 × 10-2Scm-1, from 1 × 10-2to 0.1 Scm-1, from 0.1 to 1 Scm-1, from 1 × 10-5to 1 Scm-1, from 1 × 10-4to 1 Scm-1, or from 1 × 10-2to 1 Scm-1). The ionic conductivity can be measured using methods known in the art, such as using Electrochemical Impedance Spectroscopy (EIS) and then calculated with an ionic conductivity equation. The plurality of particles of the second halide solid state electrolyte can comprise particles of any shape desired for the specific application (e.g., a sphere, a rod, a quadrilateral, an ellipse, a triangle, a polygon, etc.). In some examples, the plurality of particles of the second halide solid state electrolyte can have an irregular shape, a regular shape, an isotropic shape, an anisotropic shape, or a combination thereof. In some examples, the plurality of particles of the second halide solid state electrolyte can have an isotropic shape. In some examples, the plurality of particles of the second halide solid state electrolyte are substantially spherical. In some examples, the shape of the plurality of particles of the first halide solid state electrolyte and the 11625-006WO1; EX_ID_1038 and 1039 shape of the plurality of particles of the second halide solid state electrolyte can be the same or different. The plurality of particles of the second halide solid state electrolyte can have an average particle size. For example, the plurality of particles of the second halide solid state electrolyte can have an average particle size of 1 nanometer (nm) or more (e.g., 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 60 nm or more, 70 nm or more, 80 nm or more, 90 nm or more, 100 nm or more, 125 nm or more, 150 nm or more, 175 nm or more, 200 nm or more, 225 nm or more, 250 nm or more, 300 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 600 nm or more, 700 nm or more, 800 nm or more, 900 nm or more, 1 micrometer (micron, ^m) or more, 1.25 ^m or more, 1.5 ^m or more, 1.75 ^m or more, 2 ^m or more, 2.25 ^m or more, 2.5 ^m or more, 3 ^m or more, 3.5 ^m or more, 4 ^m or more, 4.5 ^m or more, 5 ^m or more, 6 ^m or more, 7 ^m or more, 8 ^m or more, 9 ^m or more, 10 ^m or more, 15 ^m or more, 20 ^m or more, 25 ^m or more, 30 ^m or more, 35 ^m or more, 40 ^m or more, or 45 ^m or more). In some examples, the plurality of particles of the second halide solid state electrolyte can have an average particle size of 50 micrometers (microns, µm) or less (e.g., 45 ^m or less, 40 ^m or less, 35 ^m or less, 30 ^m or less, or 25 ^m or less, 20 ^m or less, 15 ^m or less, 10 ^m or less, 9 ^m or less, 8 ^m or less, 7 ^m or less, 6 ^m or less, 5 ^m or less, 4.5 ^m or less, 4 ^m or less, 3.5 ^m or less, 3 ^m or less, 2.5 ^m or less, 2.25 ^m or less, 2 ^m or less, 1.75 ^m or less, 1.5 ^m or less, 1.25 ^m or less, 1 ^m or less, 900 nanometers (nm) or less, 800 nm or less, 700 nm or less, 600 nm or less, 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 250 nm or less, 225 nm or less, 200 nm or less, 175 nm or less, 150 nm or less, 125 nm or less, 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, 50 nm or less, 45 nm or less, 40 nm or less, 35 nm or less, 30 nm or less, 25 nm or less, 20 nm or less, 15 nm or less, 10 nm or less, or 5 nm or less). The average particle size of the plurality of particles of the second halide solid state electrolyte can range from any of the minimum values described above to any of the maximum values described above. For example, the plurality of particles of the second halide solid state electrolyte can have an average particle size of from 1 nanometers (nm) to 50 micrometers (microns, ^m) (e.g., from 1 nm to 1 ^m, from 1 ^m to 50 ^m, from 1 nm to 10 nm, from 10 nm to 100 nm, from 100 nm to 1 ^m, from 1 ^m to 10 ^m, from 10 ^m to 50 ^m, from 1 nm to 25 ^m, from 1 nm to 10 ^m, from 1 nm to 5 ^m, from 1 nm to 750 nm, from 1 nm to 500 nm, from 1 nm to 250 nm, from 1 nm to 100 nm, from 1 nm to 50 nm, from 1 nm to 25 nm, from 5 nm to 50 ^m, from 10 nm to 50 ^m, from 25 nm to 50 ^m, from 50 nm to 50 ^m, from 100 nm to 50 ^m, from 250 nm to 50 ^m, from 500 nm to 50 11625-006WO1; EX_ID_1038 and 1039 ^m, from 750 nm to 50 ^m, from 5 ^m to 50 ^m, from 10 ^m to 50 ^m, from 25 ^m to 50 ^m, from 5 nm to 45 ^m, from 10 nm to 40 ^m, from 50 nm to 30 ^m, from 100 nm to 20 ^m, or from 100 nm to 10 ^m). In some examples, the plurality of particles of the second halide solid state electrolyte can have an average particle size of from 100 nanometers to 20 micrometers. In some examples, the average particle size of the plurality of particles of the first halide solid state electrolyte and the average particle size of the plurality of particles of the second halide solid state electrolyte can be the same or different. In some examples, the plurality of particles of the second halide solid state electrolyte can be substantially monodisperse. In some examples, the plurality of particles of the second halide solid state electrolyte can comprise: a first population of particles having a first average particle size, a first particle shape, and a first composition; and a second population of particles having a second average particle size, a second particle shape, and a second composition; wherein the first average particle size and the second average particle size are different, the first particle shape and the second particle shape are different, the first composition and the second composition are different, or a combination thereof. In some examples, the plurality of particles of the second halide solid state electrolyte can comprise a mixture of a plurality of populations of particles, wherein each population of particles within the mixture is different with respect to average particle size, shape, composition, or a combination thereof. In some examples, the plurality of particles of the first halide solid state electrolyte can comprise a first population of particles having a first average particle size, a first particle shape, and a first composition; and the plurality of particles of the second halide solid state electrolyte can comprise a second population of particles having a second average particle size, a second particle shape, and a second composition; wherein the first average particle size and the second average particle size can be the same or different, the first particle shape and the second particle shape can be the same or different, the first composition and the second composition can be the same or different, or a combination thereof. Current Collector(s) In some examples, the solid state battery further comprises a first current collector. When the anode is present, the anode is sandwiched between and in contact with the first current collector and the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent). When the anode is absent, the current collector is in contact with the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent). 11625-006WO1; EX_ID_1038 and 1039 In some examples, the solid state battery further comprises a second current collector, wherein the cathode is sandwiched between and in contact with the second current collector and the halide solid state electrolyte layer. The first current collector and / or the second current collector (when present) can independently comprise any suitable material, such as those known in the art. For example, The first current collector and / or the second current collector (when present) can independently comprise a metal, a carbon material, or a combination thereof. In some examples, the first current collector and / or the second current collector (when present) can independently comprise a metal foil and / or a metal foam. In some examples, the first current collector and / or the second current collector (when present) can independently comprise copper, nickel, aluminum, or a combination thereof. Examples of suitable carbon- based conductive materials include, but are not limited to graphitic carbon and graphites, including amorphous carbon, carbon black, graphene, and others known in the art. Casing In some examples, the solid state battery can further include a casing that at least partially surrounds and / or encloses a cell comprising the anode (when present), the interfacial layer (when present), the halide solid state electrolyte layer, the composite cathode, the first current collector (when present), and the second current collector (when present). The casing can comprise any suitable material such as those known in the art. For example, the casing can comprise a polymer, a metal, an alloy, a polymer coated metal foil, or a combination thereof. Solid State Battery Properties In some examples, the anode is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. In some examples, the interfacial layer (when present) is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. In some examples, the solid state battery exhibits an energy density of 75 Wh / kg or more (e.g., 100 Wh / kg or more, 125 Wh / kg or more, 150 Wh / kg or more, 175 Wh / kg or more, 200 Wh / kg or more, 225 Wh / kg or more, 250 Wh / kg or more, 275 Wh / kg or more, 300 Wh / kg or more, 325 Wh / kg or more, 350 Wh / kg or more, 375 Wh / kg or more, 400 Wh / kg or more, 425 Wh / kg or more, 450 Wh / kg or more, 475 Wh / kg or more, 500 Wh / kg or more, 525 Wh / kg or more, 550 Wh / kg or more, or 575 Wh / kg or more). In some examples, the solid state battery exhibits an energy density of 600 Wh / kg or less (e.g., 575 Wh / kg or less, 550 Wh / kg or less, 525 Wh / kg or less, 500 Wh / kg or less, 475 Wh / kg or less, 450 Wh / kg or less, 425 Wh / kg or less, 400 11625-006WO1; EX_ID_1038 and 1039 Wh / kg or less, 375 Wh / kg or less, 350 Wh / kg or less, 325 Wh / kg or less, 300 Wh / kg or less, 275 Wh / kg or less, 250 Wh / kg or less, 225 Wh / kg or less, 200 Wh / kg or less, 175 Wh / kg or less, 150 Wh / kg or less, 125 Wh / kg or less, or 100 Wh / kg or less). The energy density of the solid state battery can range from any of the minimum values described above to any of the maximum values described above. For example, the solid state battery can exhibit an energy density of from 75 Wh / kg to 600 Wh / kg (e.g., from 75 to 325 Wh / kg, from 325 to 600 Wh / kg, from 75 to 200 Wh / kg, from 200 to 325 Wh / kg, from 325 to 450 Wh / kg, from 450 to 600 Wh / kg, from 100 to 600 Wh / kg, from 200 to 600 Wh / kg, from 300 to 600 Wh / kg, from 400 to 600 Wh / kg, or from 500 to 600 Wh / kg). The energy density of the solid state battery can be measured and / or calculated using methods known in the art. For example, the energy density of the battery can be determined from the energy the solid state battery can hold and the total weight of the solid state battery. In some examples, the solid state battery exhibits a specific discharge capacity of 100 mA h / g or more when discharged at a rate of from 0.1 C to 10 C (e.g., 125 mA h / g or more, 150 mA h / g or more, 175 mA h / g or more, 200 mA h / g or more, 225 mA h / g or more, 250 mA h / g or more, 275 mA h / g or more, 300 mA h / g or more, 325 mA h / g or more, 350 mA h / g or more, or 375 mA h / g or more). In some examples, the solid state battery exhibits a specific discharge capacity of 400 mA h / g or less when discharged at a rate of from 0.1 C to 10 C (e.g., 375 mA h / g or less, 350 mA h / g or less, 325 mA h / g or less, 300 mA h / g or less, 275 mA h / g or less, 250 mA h / g or less, 225 mA h / g or less, 200 mA h / g or less, 175 mA h / g or less, 150 mA h / g or less, or 125 mA h / g or less). The specific discharge capacity of the solid state battery can range from any of the minimum values described above to any of the maximum values described above. For example, the solid state battery can exhibit a specific discharge capacity of from 100 mA h / g to 400 mA h / g when discharged at a rate of from 0.1 C to 10 C (e.g., from 100 to 250 mA h / g, from 250 to 400 mA h / g, from 100 to 200 mA h / g, from 200 to 300 mA h / g, from 300 to 400 mA h / g, from 150 to 400 mA h / g, from 200 to 400 mA h / g, from 250 to 400 mA h / g, or from 350 to 400 mA h / g). The specific discharge capacity of the solid state battery can be calculated and / or theoretical. The specific discharge capacity of the solid state battery can be measured and / or calculated using methods known in the art. For example, the specific discharge capacity of the solid state battery can be measured using Galvanostatic cycling. In some examples, the solid state battery is rechargeable. In some examples, the solid state battery exhibits a coulombic efficiency of 80% or more (e.g., 85% or more, 90% or more, or 95% or more) for 100 cycles or more. In some examples, the solid state battery exhibits a coulombic efficiency of 99% or more for 100 cycles or more 11625-006WO1; EX_ID_1038 and 1039 (e.g., 99.1% or more, 99.2% or more, 99.3% or more, 99.4% or more, 99.5% or more, 99.6% or more, 99.7% or more, 99.8% or more, or 99.9% or more). The coulombic efficiency of the solid state battery over 100 cycles or more can be calculated and / or measured using methods known in the art. For example, the coulombic efficiency of the solid state battery can be measured by comparing the capacity of the solid state battery at any given cycle against the first cycle. The cycle life of a battery is said to be when the measured capacity of the cell reaches 80% of its original value. In some examples, the solid state battery exhibits a capacity retention of 80% or more (e.g., 85% or more, 90% or more, or 95% or more) for 100 cycles or more. In some examples, the solid state battery exhibits a capacity retention of 90% or more for 100 cycles or more (e.g., 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, 96% or more, 97% or more, 98% or more, or 99% or more). The capacity retention of the solid state battery over 100 cycles or more can be calculated and / or measured using methods known in the art. For example, the capacity retention of the solid state battery can be measured by comparing the capacity of the solid state battery at any given cycle against the first cycle. Methods of Making and Use of Solid State Batteries Also disclosed herein are methods of making and use of any of the solid state batteries disclosed herein. For example, also disclosed herein are methods of making any of the solid state batteries disclosed herein. The methods can, for example, comprise a dry chemical process in which the cathode and anode (when present) are produced separately and the halide solid state electrolyte material and the interfacial layer (when present) are produced as freestanding films or membranes and the entire cell is sandwiched together. In some examples, the methods can comprise an iterative wet chemical process where a composite cathode slurry is deposited on the cathode current collector and dried, then a slurry comprising the halide solid state electrolyte (and optionally a binding agent) is deposited on the dried cathode and dried, and subsequently the process is repeated for the interfacial layer (when present), before the anode (when present) is placed on top. Also disclosed herein are methods of use of any of the solid state batteries disclosed herein, for example in a system and / or an article. Also disclosed herein are systems comprising one or more of the solid state batteries disclosed herein. For example, the system can be an energy storage system. 11625-006WO1; EX_ID_1038 and 1039 Also disclosed herein are articles (e.g., articles of manufacture) comprising one or more of the solid state batteries disclosed herein. For example, the article can be a vehicle, such as a hybrid electric vehicle or an all-electric vehicle. In some examples, the article can comprise an electronic device, such as a portable electronic device, a laptop, a watch, a cell phone, etc. A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments are within the scope of the following claims. The examples below are intended to further illustrate certain aspects of the systems and methods described herein, and are not intended to limit the scope of the claims. EXAMPLES The following examples are set forth below to illustrate the methods and results according to the disclosed subject matter. These examples are not intended to be inclusive of all aspects of the subject matter disclosed herein, but rather to illustrate representative methods and results. These examples are not intended to exclude equivalents and variations of the present invention which are apparent to one skilled in the art. Efforts have been made to ensure accuracy with respect to numbers (e.g., amounts, temperature, etc.) but some errors and deviations should be accounted for. Unless indicated otherwise, parts are parts by weight, temperature is in °C or is at ambient temperature, and pressure is at or near atmospheric. There are numerous variations and combinations of measurement conditions, e.g., component concentrations, temperatures, pressures and other measurement ranges and conditions that can be used to optimize the described process. Example 1 Described herein is a family of lithium conducting materials, known as fast-ion conductors or solid electrolytes. In some examples, the compositions are based on the material compositions of Li3MIIIX6 and Li2MIVX6 – these materials can be generalized to the formula Li3-zM[III+z]X6(where M is a transition metal or post-transition metal cation (or a combination , X is a halide or combination of halide anions, and z is an integer from -2 to 2 with the final exponent number of M representing the valence of the M-ion(s) in the structure). From this starting chemical composition, dopants have been added to create a family of materials of general formula Li3+2x+y-zM[III+z]X6-x-yNxOy. These halide-based materials can be prepared via a purely mechanochemical synthesis. Depending on the degree of crystallinity desired in the material, they can be thermally treated post synthesis to improve the crystallinity of the 11625-006WO1; EX_ID_1038 and 1039 material’s structure. These materials show exceptional lithium-ion conductivity and are made of inexpensive precursors, making them promising candidates for all-solid-state lithium batteries. Introduction. All-solid-state batteries are considered the next step-change to current lithium-ion batteries owing to its improvement in safety and other performance metrics such as energy density and the ability to fast-charge the battery. A factor driving the transition to solid- state batteries is their non-flammability (safety) and proposed ability to enable a lithium metal anode, which can be important for the improvement in performance metrics. Lithium metal is highly reactive and unstable in current liquid electrolytes used in lithium batteries and will can cause catastrophic failure in under 100 cycles that can ignite the flammable liquid electrolyte. There has been significant improvement over the past 15-20 years in the available materials to enable this next-generation technology, namely solid-state electrolytes. The most promising materials that meet the minimum requirement of high lithium-ion conductivity come up short when other considerations are weighed for integration into a full lithium battery. Common materials that are being heavily pursued for towards the possibility of enabling an all- solid-state lithium metal anode battery are the oxides – garnet Li7La3Zr2O12 (LLZO), Li1+xAlxTi2- x(PO4)3 (LATP), Li1+xAlxGe2-x(PO4)3 (LAGP), perovskite Li3xLa2 / 3-xTiO3 LLTO, etc. - and sulfides - Li10GeP2S12 (LGPS), Li7P3S11 (LPS), Li3PS4, argyrodite Li6PS5Cl (LPSCl), etc. Each of these material classes have promising candidate materials with lithium-ion conductivities about the minimum threshold to enable a solid-state battery either for room-temperature or high temperature applications. However, all of the materials discovered to date have significant shortcomings that are either major engineering challenges when it comes to cell design that limit the realized potential of the final solid-state battery, are fundamental material shortcomings that make them impractical to use in a full cell, or are difficult to process in such a way that any realized benefit of the final cell would be negated (expensive and / or extremely difficult processing). Halide-based solid-state electrolyte materials are a relatively recent class of materials that was discovered in 2018. These materials provide a unique combination of properties that make them well-suited for all-solid-state batteries. They are produced with inexpensive precursors and manufacturing methods, have a relatively high ionic conductivity, and a wide electrochemical stability window. The original materials that were introduced were of the composition Li3MX6, where M is a 3+ transition-metal or post transition-metal and X is a group 7 halogen and contained a variable structure depending on halogen anion element. The Li3YCl6 (LYC) composition crystalizes in the P3തm1 space group (distorted NiAs structure) with the Li3YBr6 (LYB) 11625-006WO1; EX_ID_1038 and 1039 composition crystalizes in the C2 / m space group (distorted rock-salt structure). The primary difference between these two compositions is that the LYC material has a hexagonal close- packed-like anion sublattice, while the LYB material has a cubic close-packed-like anion sublattice – for both materials all the cations (Li+and Y3+in this case) are in octahedral site geometries with one third of the available cation sites left vacant. Although these materials possess a relatively high ionic conductivity on the order of 10-4S cm-1after a purely mechanochemical synthesis, only the Li3YBr6 material shows promise of surpassing the material requirement of 10-3S cm-1for ionic conductivity required for a practical room-temperature all- solid-state battery – after a high temperature crystallization step. Therefore, there is still a great need to develop a halide-based solid-electrolyte with > 10-3Scm-1ionic conductivity at room- temperature that can be prepared through an inexpensive mechanochemical synthesis method. Herein, the composition of these base materials was modified to improve the ionic conductivity of the materials closer to the operational range of 10-3Scm-1. These chemical modifications can also improve the interfacial compatibility / stability of the materials with other lithium battery components, such as the cathode active material, the anode active material, and alternative interfacial materials. Additionally, the chemical modifications can make the material more stable across a range of solvents for wet processing the material into a full battery cell. These materials remain inexpensive and demonstrate high ionic conductivity in a low state of crystallinity stemming from their purely mechanochemical synthesis. Detailed description. Described herein is a compositional family of solid electrolyte materials, their method of preparation, and their resulting attributes specifically as they can be applied to their use in all-solid-state batteries or hybrid solid-state batteries. The compositional family of materials described herein is Li3+2x+y-zM[III+z]X6-x-yNxOy (where M is a transition metal or post-transition metal cation (or a combination thereof), X is a halide or combination of halide anions, and z is an integer from -2 to 2 with the final exponent number of M representing the valence of the M-ion(s) in the structure). These materials can be prepared to have a high ionic conductivity though a purely mechanochemical synthesis without the need for a high temperature sintering step. However, a high temperature sintering step can be added to tune the degree of crystallinity for these materials. The ability to obtain a high ionic conductivity without the need of a high temperature synthesis step drastically reduces the manufacturing costs of these materials. Additionally, the ionic conductivity obtained with some of the compositions tested for this disclosure exceeds what has previously been reported for this class of materials. Structure. The materials in the Li3+2x+y-zM[III+z]X6-x-yNxOy compositional family crystallize in the P3തm1 space group (distorted NiAs structure) for halide elements that are higher 11625-006WO1; EX_ID_1038 and 1039 up on the periodic table (Cl and F), but can crystallize in the C2 / m space group (distorted rock- salt structure) for bromine and lower halide elements (iodine). Figure 1 provides an isometric view of the P3തm1 crystal structure where the silver spheres represent lithium atomic positions in the structure, but their occupancy varies depending on the lithium concentration material as reflected in the compositional formula. The blue spheres represent the atomic positions of the halide anion or oxygen / nitrogen anion dopant that is novel to the disclosed material system. Figure 2, Figure 3, and Figure 4 show the distorted NiAs structure along the a, b, and c crystallographic planes, respectively. To demonstrate the feasibility of producing these materials, two compositions were prepared – Li2.75ZrCl5.25O0.75 and Li3.25ZrCl5N0.25O0.75. These materials were prepared by combining stoichiometric amounts of LiCl, ZrCl4, Li3N, and / or Li2O in a ZrO2 jar with ZrO2 grinding media, grinding the precursors for 12 hours in a planetary ball-mill then grinding the mixture for 6 hours in a high-energy ball mill. The resulting materials were tested as is. X-ray diffraction was performed on these two material compositions to confirm their crystal structure. The X-ray diffraction pattern of the Li2.75ZrCl5.25O0.75 material is shown in Figure 5. The sharp peaks designated with a * are attributed to the aluminum sample holder required for air-sensitive sample testing. The other peaks are more diffuse indicating a low degree of crystallinity from the actual halide solid electrolyte material. However, the peak positions indicate that the proper structure was formed without any sign of residual precursor materials or other material impurities. Figure 6 shows the X-ray diffraction pattern of the Li3.25ZrCl5N0.25O0.75 material. The results of this material are similar to that of the other composition. The peaks attributed to the halide solid electrolyte sample are more diffuse, again indicating a low degree of crystallinity, but the peaks are in the right positions to verify that the right structure was formed for this material. For this sample, there was again no indication of residual unreacted precursor material or the formation of any impurity phases. Li+Conductivity. Figure 7 shows the electrochemical impedance spectrum of the synthesized Li2.75ZrCl5.25O0.75 and Li3.25ZrCl5N0.25O0.75 materials. Each sample was compressed into a pellet for electrochemical impedance measurements and tested in a symmetric cell with stainless steel electrodes on both sides of the pellet. The impedance spectra were obtained in the frequency range of 1 MHz to 0.1 Hz with a perturbation voltage of 10 mV. The ionic conductivity values (ı) shown for each material were determined by fitting each spectrum with the equivalent circuit shown in Figure 8. The R2 value obtained via the fitting was then input into the formula, 11625-006WO1; EX_ID_1038 and 1039 ^^ ൌ^ ൈ ^where l is the thickness of the pellet cross-sectional area of the pellet sample, and R is the resistance value (R2 in from the spectrum fitting for the respective material. The calculated ionic conductivity values for all the prepared compositions are provided in Table 1. Table 1. Summary of prepared example halide solid electrolyte material compositions described herein and their measured Li+conductivity. Material Composition Ionic Conductivity (mS / cm) Li22 ZrCl O 2 0272 Example 2 Described herein is a concept for a secondary all-solid-state lithium metal battery consisting of the halide-based ceramic solid electrolyte materials described herein and an interfacial material between this solid electrolyte material and a high-energy density anode – namely silicon (or a silicon composite) and / or lithium metal (or a lithium metal alloy or composite). The interfacial layer can stabilize the interface between the high energy density anode and the halide based solid electrolyte materials. This disclosure encompasses the family of halide solid electrolyte materials described above into an all-solid-state battery. For such batteries, the cathode composite can be reformulated to include some of the solid electrolyte composition. Further, an interlayer can be included between the solid electrolyte and a high energy density anode material, such as a silicon (or silicon composite) or a lithium metal anode (or a composite or alloy thereof). The cathode composite can be deposited on an aluminum foil current collector that can optionally contain a carbon coating. The cathode composite itself can comprise: 1) the cathode active material, 2) the solid electrolyte material, 3) an electronically conductive carbon additive, 11625-006WO1; EX_ID_1038 and 1039 and 4) (optionally) a polymeric binder. The battery can be assembled with a wide range of cathode active materials. Two of the leading industry chemistries for cathode active materials are LiFePO4 and Li[NixMnyCoz]O2 (x+y+z =1). The electrolyte component(s) can comprise the halide-based solid electrolyte compositions disclosed herein above. In some examples, the electrolyte can optionally contain a polymeric binder material. The interfacial layer can comprise a lithium-ion conducting solid that is stable against the halide-based solid electrolyte and the high energy density anode. For example, the interfacial layer can comprise a material with high reduction stability, but high oxidation stability is optional. The anode component can comprise a silicon composite anode (silicon with a conductive carbon additive and binder), or a lithium metal anode (can be pure lithium metal on a copper current collector, a lithium alloy anode, or a composite structure with lithium metal plated within it). In some examples, the anode can comprise a prelithiated silicon anode, a silicon-graphite composite anode, a prelithiated silicon-graphite composite anode, or a combination thereof. In some examples, the battery can comprise an anode-free cell architecture. Methods of making the solid state batteries are also included. For example, the method can comprise a dry chemical process in which the cathode and anode are produced separately and the solid electrolyte material and interlayer material are produced as freestanding films or membranes and the entire cell is “sandwiched” together. In some examples, the method can comprise an iterative wet chemical process where a cathode composite slurry is deposited on the cathode current collector and dried, then a slurry comprising the solid electrolyte and possibly a binding agent is deposited on the dried cathode and dried, and lastly the process is repeated for the interfacial layer before the anode is placed on top. A pressing step to adhere the anode to the cathode / electrolyte / interlayer preassembled sandwich can be applied to ensure a good interface between the cathode and electrolyte as well as the anode and interlayer. EXEMPLARY ASPECTS In view of the described solid state batteries, such as pseudo solid-state and all solid-state batteries, and methods of making and use thereof, herein below are described certain more particularly described aspects of the inventions. The particularly recited aspects should not, however, be interpreted to have any limiting effect on any different claims containing different or more general teachings described herein or that the “particular” aspects are somehow limited 11625-006WO1; EX_ID_1038 and 1039 in some way other than the inherent meanings of the language and formulas literally used therein. Example 1: A solid state lithium ion conductor comprising a compound of Formula I: Li3+2x+y-zM[III+z]X6-x-yNxOy I wherein M is an alkali metal, an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof; X is a halide (e.g., F, Cl, Br, I, or a combination thereof); x is from 0 to 6; y is from 0 to 6; z is from -2 to 2; and [III+z] represents the valence of the M-ion(s); with the proviso that: M is not Li; the sum of x and y is greater than 0 and less than or equal to 6 (e.g., 0 < x + y ^ 6); and (3+2x+y-z) is greater than 0 and less than or equal to 6 (e.g., 0 < (3+2z+y-z) ^ 6). Example 2: The solid state lithium ion conductor of any examples herein, particularly example 1, wherein M is an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof. Example 3: The solid state lithium ion conductor of any examples herein, particularly example 1 or example 2, wherein M is a transition metal, a post transition metal, or a combination thereof. Example 4: The solid state lithium ion conductor of any examples herein, particularly examples 1-3, wherein M is a transition metal. Example 5: The solid state lithium ion conductor of any examples herein, particularly examples 1-4, wherein M is Zr. Example 6: The solid state lithium ion conductor of any examples herein, particularly examples 1-5, wherein x is from 0 to 1. Example 7: The solid state lithium ion conductor of any examples herein, particularly examples 1-6, wherein x is from 0 to 0.25. Example 8: The solid state lithium ion conductor of any examples herein, particularly examples 1-7, wherein y is from 0 to 1. 11625-006WO1; EX_ID_1038 and 1039 Example 9: The solid state lithium ion conductor of any examples herein, particularly examples 1-8, wherein y is from 0.25 to 1. Example 10: The solid state lithium ion conductor of any examples herein, particularly examples 1-9, wherein M is a transition metal and x is from 0 to 1. Example 11: The solid state lithium ion conductor of any examples herein, particularly examples 1-10, wherein M is a transition metal and x is from 0 to 0.25. Example 12: The solid state lithium ion conductor of any examples herein, particularly examples 1-11, wherein M is a transition metal and y is from 0 to 1. Example 13: The solid state lithium ion conductor of any examples herein, particularly examples 1-12, wherein M is a transition metal and y is from 0.25 to 1. Example 14: The solid state lithium ion conductor of any examples herein, particularly examples 1-13, wherein M is Zr and x is from 0 to 1. Example 15: The solid state lithium ion conductor of any examples herein, particularly examples 1-14, wherein M is Zr and x is from 0 to 0.25. Example 16: The solid state lithium ion conductor of any examples herein, particularly examples 1-15, wherein M is Zr and y is from 0 to 1. Example 17: The solid state lithium ion conductor of any examples herein, particularly examples 1-16, wherein M is Zr and y is from 0.25 to 1. Example 18: The solid state lithium ion conductor of any examples herein, particularly examples 1-17, wherein x is from 0 to 1 and y is from 0 to 1. Example 19: The solid state lithium ion conductor of any examples herein, particularly examples 1-18, wherein x is from 0 to 1 and y is from 0.25 to 1. Example 20: The solid state lithium ion conductor of any examples herein, particularly examples 1-19, wherein x is from 0 to 0.25 and y is from 0 to 1. Example 21: The solid state lithium ion conductor of any examples herein, particularly examples 1-20, wherein x is from 0 to 0.25 and y is from 0.25 to 1. Example 22: The solid state lithium ion conductor of any examples herein, particularly examples 1-21, wherein M is a transition metal, x is from 0 to 1, and y is from 0 to 1. Example 23: The solid state lithium ion conductor of any examples herein, particularly examples 1-22, wherein M is a transition metal, x is from 0 to 1, and y is from 0.25 to 1. Example 24: The solid state lithium ion conductor of any examples herein, particularly examples 1-23, wherein M is a transition metal, x is from 0 to 0.25, and y is from 0 to 1. Example 25: The solid state lithium ion conductor of any examples herein, particularly examples 1-24, wherein M is a transition metal, x is from 0 to 0.25, and y is from 0.25 to 1. 11625-006WO1; EX_ID_1038 and 1039 Example 26: The solid state lithium ion conductor of any examples herein, particularly examples 1-25, wherein M is Zr, x is from 0 to 1, and y is from 0 to 1. Example 27: The solid state lithium ion conductor of any examples herein, particularly examples 1-26, wherein M is Zr, x is from 0 to 1, and y is from 0.25 to 1. Example 28: The solid state lithium ion conductor of any examples herein, particularly examples 1-27, wherein M is Zr, x is from 0 to 0.25, and y is from 0 to 1. Example 29: The solid state lithium ion conductor of any examples herein, particularly examples 1-28, wherein M is Zr, x is from 0 to 0.25, and y is from 0.25 to 1. Example 30: The solid state lithium ion conductor of any examples herein, particularly examples 1-29, wherein the solid state lithium ion conductor comprises Li2.25ZrCl5.75O0.25, Li2.5ZrCl5.5O0.5, Li2.7ZrCl5.3O0.7, Li2.75ZrCl5.25O0.75, Li3ZrCl5O, Li3.25ZrCl5N0.25O0.75, Li3.7ZrCl5.35N0.05O0.6, Li2.75ZrCl4.05O0.75F1.2, or a combination thereof. Example 31: The solid state lithium ion conductor of any examples herein, particularly examples 1-30, wherein the solid state lithium ion conductor comprises Li2.75ZrCl5.25O0.75, Li3.25ZrCl5N0.25O0.75, or a combination thereof. Example 32: The solid state lithium ion conductor of any examples herein, particularly examples 1-31, wherein the solid state lithium ion conductor has a lithium ion conductivity of from 1 × 10-5Scm-1to 0.1 Scm-1. Example 33: The solid state lithium ion conductor of any examples herein, particularly examples 1-32, wherein the solid state lithium ion conductor has a lithium ion conductivity of from 0.1 to 1 mS / cm. Example 34: A method of making the solid state lithium ion conductor of any examples herein, particularly examples 1-33, wherein the method comprises a mechanochemical synthesis. Example 35: The method of any examples herein, particularly example 34, wherein the method comprises combining a plurality of precursors to form a mixture and ball milling the mixture to form the solid state lithium ion conductor. Example 36: The method of any examples herein, particularly example 35, wherein the method comprises a two-step ball-milling method. Example 37: The method of any examples herein, particularly example 36, wherein the two-step method comprises a first step followed by a second step, the first step comprising planetary ball-milling and the second step comprising high-energy ball milling. Example 38: The method of any examples herein, particularly examples 35-37, further comprising a post synthesis thermal treatment, for example to improve the crystallinity of the solid state lithium ion conductor. 11625-006WO1; EX_ID_1038 and 1039 Example 39: A system comprising the solid state lithium ion conductor of any examples herein, particularly examples 1-33. Example 40: An article comprising the solid state lithium ion conductor of any examples herein, particularly examples 1-33. Example 41: A device comprising the solid state lithium ion conductor of any examples herein, particularly examples 1-33. Example 42: The device of any examples herein, particularly example 41, wherein the device is an energy storage device, such as a battery. Example 43: The device of any examples herein, particularly example 41 or example 42, wherein the device is a battery, such as a solid state battery. Example 44: A solid state battery comprising: a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any examples herein, particularly examples 1-33; and a composite cathode; wherein the halide solid state electrolyte layer is disposed on and in contact with the composite cathode; wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. Example 45: The solid state battery of any examples herein, particularly example 44, further comprising an anode, wherein the halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode. Example 46: A solid state battery comprising: an anode; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any examples herein, particularly examples 1-33; and a composite cathode; wherein the halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode; wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. Example 47: The solid state battery of any examples herein, particularly example 46, further comprising an interfacial layer comprising an interfacial material, wherein: the interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer; the halide solid state electrolyte layer is sandwiched between and in contact with the 11625-006WO1; EX_ID_1038 and 1039 interfacial layer and the composite cathode; the anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window; and the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode. Example 48: A solid state battery comprising: an anode; an interfacial layer comprising an interfacial material; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any examples herein, particularly examples 1-33; and a composite cathode; wherein the interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer; wherein the halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode; wherein the anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window; wherein the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode; and wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. Example 49: The solid state battery of any examples herein, particularly example 47 or example 48, wherein the interfacial layer is formed in situ. Example 50: The solid state battery of any examples herein, particularly examples 47-49, wherein the interfacial layer has an average thickness of from 1 nanometers (nm) to 100 micrometers (microns, ^m). Example 51: The solid state battery of any examples herein, particularly examples 47-50, wherein the interfacial layer has an average thickness of from 1 micrometer (micron, ^m) to 20 micrometers. Example 52: The solid state battery of any examples herein, particularly examples 47-51, wherein the interfacial layer has an ionic conductivity of lithium of from 1 × 10-8Scm-1to 0.1 Scm-1. Example 53: The solid state battery of any examples herein, particularly examples 47-52, wherein the interfacial material comprises Li6PS5X (where X is Cl, Br, or I), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3xLa2 / 3-xTiO3 (lithium lanthanum titanate (LLTO) perovskite), Li3N, Li3P, Li3PS4, LiBH4, Li2+2xZn1íxGeO4, Li1+xAlxTi2-x(PO4)3 (LATP), Li1+xAlxGe2-x(PO4)3 11625-006WO1; EX_ID_1038 and 1039 (LAGP), Li10GeP2S12 (LGPS), derivatives thereof (e.g., doped versions thereof), or a combination thereof. Example 54: The solid state battery of any examples herein, particularly examples 47-53, wherein the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3N, Li3PS4, Li3P, or a combination thereof. Example 55: The solid state battery of any examples herein, particularly examples 47-54, wherein the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12(LLZO), Li3PS4, or a combination thereof. Example 56: The solid state battery of any examples herein, particularly examples 47-55, wherein the interfacial layer comprises a plurality of particles of the interfacial material. Example 57: The solid state battery of any examples herein, particularly example 56, wherein the plurality of particles of the interfacial material have an average particle size of from 1 nanometer (nm) to 25 micrometers (microns, µm). Example 58: The solid state battery of any examples herein, particularly example 56 or example 57, wherein the plurality of particles of the interfacial material have an average particle size of from 100 nanometers (nm) to 10 micrometers (microns, µm). Example 59: The solid state battery of any examples herein, particularly examples 45-58, wherein the anode is formed in situ. Example 60: The solid state battery of any examples herein, particularly examples 45-59, wherein the anode has a high capacity and / or a high energy density. Example 61: The solid state battery of any examples herein, particularly examples 45-60, wherein the anode has a specific capacity of from 100 to 4000 mAh / g. Example 62: The solid state battery of any examples herein, particularly examples 45-61, wherein the anode has a low intercalation voltage. Example 63: The solid state battery of any examples herein, particularly examples 45-62, wherein the anode has an intercalation voltage of as 1 V or less versus Li+ / Li0. Example 64: The solid state battery of any examples herein, particularly examples 45-63, wherein the anode comprises a metal, an alloy, an intercalation material, or a combination thereof. Example 65: The solid state battery of any examples herein, particularly examples 45-64, wherein the anode comprises lithium, silicon, indium, graphite, hard carbon, or a combination thereof. Example 66: The solid state battery of any examples herein, particularly examples 45-65, wherein the anode comprises lithium (e.g., lithium metal and / or a lithium alloy). 11625-006WO1; EX_ID_1038 and 1039 Example 67: The solid state battery of any examples herein, particularly examples 45-66, wherein the anode comprises lithium metal. Example 68: The solid state battery of any examples herein, particularly examples 45-67, wherein the anode comprises a lithium alloy. Example 69: The solid state battery of any examples herein, particularly examples 45-68, wherein the anode comprises a lithium-indium alloy, a lithium-magnesium alloy, a lithium- aluminum alloy, a lithium-iron alloy, or a combination thereof. Example 70: The solid state battery of any examples herein, particularly examples 45-69, wherein the anode comprises a lithium-indium alloy. Example 71: The solid state battery of any examples herein, particularly examples 45-70, wherein the anode comprises silicon or a silicon composite. Example 72: The solid state battery of any examples herein, particularly examples 45-71, wherein the anode is a composite (e.g., a composite anode). Example 73: The solid state battery of any examples herein, particularly example 72, wherein the composite anode further includes a binder. Example 74: The solid state battery of any examples herein, particularly example 73, wherein the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. Example 75: The solid state battery of any examples herein, particularly examples 72-74, wherein the composite anode further includes a conductive additive. Example 76: The solid state battery of any examples herein, particularly example 75, wherein the conductive additive comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof. Example 77: The solid state battery of any examples herein, particularly example 75 or example 76, wherein the conductive additive comprises carbon black. Example 78: The solid state battery of any examples herein, particularly examples 45-77, wherein the anode comprises a prelithiated host structure (e.g., a prelithiated silicon anode, a prelithiated silicon-graphite composite anode, a prelithiated graphite, a prelithiated hard carbon, etc.), a silicon-graphite composite anode, or a combination thereof. 11625-006WO1; EX_ID_1038 and 1039 Example 79: The solid state battery of any examples herein, particularly examples 44-78, wherein the halide solid state electrolyte layer has an average thickness of from 1 to 100 micrometers (microns, µm). Example 80: The solid state battery of any examples herein, particularly examples 44-79, wherein the halide solid state electrolyte layer comprises a plurality of particles of the first halide solid state electrolyte. Example 81: The solid state battery of any examples herein, particularly example 80, wherein the plurality of particles of the first halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 100 micrometers (microns, µm). Example 82: The solid state battery of any examples herein, particularly example 80 or example 81, wherein the plurality of particles of the first halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers. Example 83: The solid state battery of any examples herein, particularly examples 44-82, wherein the electrochemical stability window of the halide solid state electrolyte is compatible with the electrochemical stability window of the composite cathode. Example 84: The solid state battery of any examples herein, particularly examples 44-83, wherein the cathode active material comprises a high density nickel-rich layered transition metal oxide (e.g., Li[NixMnyCoz]O2 (x+y+z = 1)), LiFe1-xMnxPO4 (LMFP), a lithium iron phosphate (LFP, LiFePO4), lithium manganese oxide (LiMn2O4), nickel-doped lithium manganese oxide (Li[Ni0.5Mn1.5]O4), LiCoO2, LiNiO2, or a combination thereof. Example 85: The solid state battery of any examples herein, particularly examples 44-84, wherein the cathode active material comprises Li[NixMnyCoz]O2 where x+y+z = 1, LiFePO4, or a combination thereof. Example 86: The solid state battery of any examples herein, particularly examples 44-85, wherein the conductive additive comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof. Example 87: The solid state battery of any examples herein, particularly examples 44-86, wherein the conductive additive comprises carbon black. Example 88: The solid state battery of any examples herein, particularly examples 44-87, wherein the composite cathode further comprises a binder. Example 89: The solid state battery of any examples herein, particularly example 88, wherein the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene 11625-006WO1; EX_ID_1038 and 1039 rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof. Example 90: The solid state battery of any examples herein, particularly examples 44-89, wherein the solid state battery is an all solid state battery. Example 91: The solid state battery of any examples herein, particularly example 90, wherein the electrolyte of the composite cathode is a plurality of particles comprising a second halide solid state electrolyte. Example 92: The solid state battery of any examples herein, particularly example 91, wherein the second halide solid state electrolyte has an ionic conductivity of lithium of from 1 × 10-6Scm-1to 1 Scm-1. Example 93: The solid state battery of any examples herein, particularly example 91 or example 92, wherein the second halide solid state electrolyte comprises a lithium halide, a sodium halide, or a combination thereof. Example 94: The solid state battery of any examples herein, particularly examples 91-93, wherein the second halide solid state electrolyte comprises a lithium halide. Example 95: The solid state battery of any examples herein, particularly examples 91-94, wherein the second halide solid state electrolyte comprises the solid state lithium ion conductor of any examples herein, particularly examples 1-33. Example 96: The solid state battery of any examples herein, particularly examples 91-94, wherein the second halide solid state electrolyte comprises Li3-zM[III+z]X6, where X is one or more halides, z is an integer from -2 to 2, and [III+z] represents the valence of the M-ion(s) in the compound. Example 97: The solid state battery of any examples herein, particularly examples 91-96, wherein the second halide solid state electrolyte and the first halide solid state electrolyte are the same. Example 98: The solid state battery of any examples herein, particularly examples 91-96, wherein the second halide solid state electrolyte and the first halide solid state electrolyte are different. Example 99: The solid state battery of any examples herein, particularly examples 91-98, wherein the plurality of particles of second halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 50 micrometers (microns, µm). 11625-006WO1; EX_ID_1038 and 1039 Example 100: The solid state battery of any examples herein, particularly examples 91- 99, wherein the plurality of particles of second halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers. Example 101: The solid state battery of any examples herein, particularly examples 91- 100, wherein the average particle size of the plurality of particles of the first halide solid state electrolyte and the average particle size of the plurality of particles of the second halide solid state electrolyte are the same. Example 102: The solid state battery of any examples herein, particularly examples 91- 100, wherein the average particle size of the plurality of particles of the first halide solid state electrolyte and the plurality of particles of the second halide solid state electrolyte are different. Example 103: The solid state battery of any examples herein, particularly examples 44- 89, wherein the solid state battery is a pseudo solid state battery. Example 104: The solid state battery of any examples herein, particularly example 103, wherein the electrolyte of the composite cathode is a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte. Example 105: The solid state battery of any examples herein, particularly examples 44- 104, wherein the solid state battery further comprises a first current collector, wherein: when the anode is present, the anode is sandwiched between and in contact with the first current collector and the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent); and when the anode is absent, the first current collector is in contact with the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent). Example 106: The solid state battery of any examples herein, particularly examples 44- 105, wherein the solid state battery further comprises a second current collector, wherein the cathode is sandwiched between and in contact with the second current collector and the halide solid state electrolyte layer. Example 107: The solid state battery of any examples herein, particularly example 105 or example 106, wherein the first current collector and / or the second current collector (when present) independently comprise a metal, a carbon material, or a combination thereof. Example 108: The solid state battery of any examples herein, particularly examples 44- 107, wherein the solid state battery further includes a casing that at least partially surrounds and / or encloses a cell comprising the anode (when present), the interfacial layer (when present), the halide solid state electrolyte layer, the composite cathode, the first current collector (when present), and the second current collector (when present). 11625-006WO1; EX_ID_1038 and 1039 Example 109: The solid state battery of any examples herein, particularly example 108, wherein the casing comprises a polymer, a metal, an alloy, a polymer coated metal foil, or a combination thereof. Example 110: The solid state battery of any examples herein, particularly examples 45- 109, wherein the anode is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. Example 111: The solid state battery of any examples herein, particularly examples 44- 110, wherein the interfacial layer is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery. Example 112: The solid state battery of any examples herein, particularly examples 44- 111, wherein the solid state battery exhibits an energy density of from 75 Wh / kg to 600 Wh / kg. Example 113: The solid state battery of any examples herein, particularly examples 44- 112, wherein the solid state battery exhibits a specific discharge capacity of from 100 mA h / g to 400 mA h / g when discharged at a rate of from 0.1 C to 10 C. Example 114: The solid state battery of any examples herein, particularly examples 44- 113, wherein the solid state battery is rechargeable. Example 115: The solid state battery of any examples herein, particularly examples 44- 114, wherein the solid state battery exhibits a coulombic efficiency of 80% or more for 100 cycles or more. Example 116: The solid state battery of any examples herein, particularly examples 44- 115, wherein the solid state battery exhibits a coulombic efficiency of 99% or more for 100 cycles or more. Example 117: The solid state battery of any examples herein, particularly examples 44- 116, wherein the solid state battery exhibits a capacity retention of 80% or more for 100 cycles or more. Example 118: The solid state battery of any examples herein, particularly examples 44- 117, wherein the solid state battery exhibits a capacity retention of 90% or more for 100 cycles or more. Example 119: A method of making the solid state battery of any examples herein, particularly examples 44-118. Example 120: The method of any examples herein, particularly example 119, wherein the method comprises a dry chemical process in which the cathode and anode (when present) are produced separately and the halide solid state electrolyte material and the interfacial layer (when 11625-006WO1; EX_ID_1038 and 1039 present) are produced as freestanding films or membranes and the entire cell is sandwiched together. Example 121: The method of any examples herein, particularly example 119, wherein the method comprises an iterative wet chemical process where a composite cathode slurry is deposited on the cathode current collector and dried, then a slurry comprising the halide solid state electrolyte (and optionally a binding agent) is deposited on the dried cathode and dried, and subsequently the process is repeated for the interfacial layer (when present), before the anode (when present) is placed on top. Example 122: A system comprising one or more of the solid state batteries of any examples herein, particularly examples 46-118. Example 123: The system of any examples herein, particularly example 122, wherein the system is an energy storage system. Example 124: An article comprising one or more of the solid state batteries of any examples herein, particularly examples 46-118. Example 125: The article of any examples herein, particularly example 124, wherein the article is a vehicle, such as a hybrid electric vehicle or an all-electric vehicle. Example 126: The article of any examples herein, particularly example 124, wherein the article comprises an electronic device, such as a portable electronic device, a laptop, a watch, or a cell phone. Other advantages which are obvious and which are inherent to the invention will be evident to one skilled in the art. It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of the claims. Since many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense. The methods of the appended claims are not limited in scope by the specific methods described herein, which are intended as illustrations of a few aspects of the claims and any methods that are functionally equivalent are intended to fall within the scope of the claims. Various modifications of the methods in addition to those shown and described herein are intended to fall within the scope of the appended claims. Further, while only certain representative method steps disclosed herein are specifically described, other combinations of the method steps also are intended to fall within the scope of the appended claims, even if not 11625-006WO1; EX_ID_1038 and 1039 specifically recited. Thus, a combination of steps, elements, components, or constituents may be explicitly mentioned herein or less, however, other combinations of steps, elements, components, and constituents are included, even though not explicitly stated.

Claims

11625-006WO1; EX_ID_1038 and 1039 CLAIMS What is claimed is:

1. A solid state lithium ion conductor comprising a compound of Formula I: Li3+2x+y-zM[III+z]X6-x-yNxOy I wherein M is an alkali metal, an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof; X is a halide (e.g., F, Cl, Br, I, or a combination thereof); x is from 0 to 6; y is from 0 to 6; z is from -2 to 2; and [III+z] represents the valence of the M-ion(s); with the proviso that: M is not Li; the sum of x and y is greater than 0 and less than or equal to 6 (e.g., 0 < x + y ^ 6); and (3+2x+y-z) is greater than 0 and less than or equal to 6 (e.g., 0 < (3+2z+y-z) ^ 6).

2. The solid state lithium ion conductor of claim 1, wherein M is an alkaline earth metal, a transition metal, a post transition metal, or a combination thereof.

3. The solid state lithium ion conductor of claim 1 or claim 2, wherein M is a transition metal, a post transition metal, or a combination thereof.

4. The solid state lithium ion conductor of any one of claims 1-3, wherein M is a transition metal.

5. The solid state lithium ion conductor of any one of claims 1-4, wherein M is Zr.

6. The solid state lithium ion conductor of any one of claims 1-5, wherein x is from 0 to 1.

7. The solid state lithium ion conductor of any one of claims 1-6, wherein x is from 0 to 0.

25.

8. The solid state lithium ion conductor of any one of claims 1-7, wherein y is from 0 to 1.11625-006WO1; EX_ID_1038 and 1039 9. The solid state lithium ion conductor of any one of claims 1-8, wherein y is from 0.25 to 1.

10. The solid state lithium ion conductor of any one of claims 1-9, wherein M is a transition metal and x is from 0 to 1.

11. The solid state lithium ion conductor of any one of claims 1-10, wherein M is a transition metal and x is from 0 to 0.

25.

12. The solid state lithium ion conductor of any one of claims 1-11, wherein M is a transition metal and y is from 0 to 1.

13. The solid state lithium ion conductor of any one of claims 1-12, wherein M is a transition metal and y is from 0.25 to 1.

14. The solid state lithium ion conductor of any one of claims 1-13, wherein M is Zr and x is from 0 to 1.

15. The solid state lithium ion conductor of any one of claims 1-14, wherein M is Zr and x is from 0 to 0.

25.

16. The solid state lithium ion conductor of any one of claims 1-15, wherein M is Zr and y is from 0 to 1.

17. The solid state lithium ion conductor of any one of claims 1-16, wherein M is Zr and y is from 0.25 to 1.

18. The solid state lithium ion conductor of any one of claims 1-17, wherein x is from 0 to 1 and y is from 0 to 1.

19. The solid state lithium ion conductor of any one of claims 1-18, wherein x is from 0 to 1 and y is from 0.25 to 1.

20. The solid state lithium ion conductor of any one of claims 1-19, wherein x is from 0 to 0.25 and y is from 0 to 1.

21. The solid state lithium ion conductor of any one of claims 1-20, wherein x is from 0 to 0.25 and y is from 0.25 to 1.11625-006WO1; EX_ID_1038 and 1039 22. The solid state lithium ion conductor of any one of claims 1-21, wherein M is a transition metal, x is from 0 to 1, and y is from 0 to 1.

23. The solid state lithium ion conductor of any one of claims 1-22, wherein M is a transition metal, x is from 0 to 1, and y is from 0.25 to 1.

24. The solid state lithium ion conductor of any one of claims 1-23, wherein M is a transition metal, x is from 0 to 0.25, and y is from 0 to 1.

25. The solid state lithium ion conductor of any one of claims 1-24, wherein M is a transition metal, x is from 0 to 0.25, and y is from 0.25 to 1.

26. The solid state lithium ion conductor of any one of claims 1-25, wherein M is Zr, x is from 0 to 1, and y is from 0 to 1.

27. The solid state lithium ion conductor of any one of claims 1-26, wherein M is Zr, x is from 0 to 1, and y is from 0.25 to 1.

28. The solid state lithium ion conductor of any one of claims 1-27, wherein M is Zr, x is from 0 to 0.25, and y is from 0 to 1.

29. The solid state lithium ion conductor of any one of claims 1-28, wherein M is Zr, x is from 0 to 0.25, and y is from 0.25 to 1.

30. The solid state lithium ion conductor of any one of claims 1-29, wherein the solid state lithium ion conductor comprises Li2.25ZrCl5.75O0.25, Li2.5ZrCl5.5O0.5, Li2.7ZrCl5.3O0.7, Li2.75ZrCl5.25O0.75, Li3ZrCl5O, Li3.25ZrCl5N0.25O0.75, Li3.7ZrCl5.35N0.05O0.6, Li2.75ZrCl4.05O0.75F1.2, or a combination thereof.

31. The solid state lithium ion conductor of any one of claims 1-30, wherein the solid state lithium ion conductor comprises Li2.75ZrCl5.25O0.75, Li3.25ZrCl5N0.25O0.75, or a combination thereof.

32. The solid state lithium ion conductor of any one of claims 1-31, wherein the solid state lithium ion conductor has a lithium ion conductivity of from 1 × 10-5Scm-1to 0.1 Scm-1.

33. The solid state lithium ion conductor of any one of claims 1-32, wherein the solid state lithium ion conductor has a lithium ion conductivity of from 0.1 to 1 mS / cm.11625-006WO1; EX_ID_1038 and 1039 34. A method of making the solid state lithium ion conductor of any one of claims 1-33, wherein the method comprises a mechanochemical synthesis.

35. The method of claim 34, wherein the method comprises combining a plurality of precursors to form a mixture and ball milling the mixture to form the solid state lithium ion conductor.

36. The method of claim 35, wherein the method comprises a two-step ball-milling method.

37. The method of claim 36, wherein the two-step method comprises a first step followed by a second step, the first step comprising planetary ball-milling and the second step comprising high-energy ball milling.

38. The method of any one of claims 35-37, further comprising a post synthesis thermal treatment, for example to improve the crystallinity of the solid state lithium ion conductor.

39. A system comprising the solid state lithium ion conductor of any one of claims 1-33.

40. An article comprising the solid state lithium ion conductor of any one of claims 1-33.

41. A device comprising the solid state lithium ion conductor of any one of claims 1-33.

42. The device of claim 41, wherein the device is an energy storage device, such as a battery.

43. The device of claim 41 or claim 42, wherein the device is a battery, such as a solid state battery.

44. A solid state battery comprising: a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any one of claims 1-33; and a composite cathode; wherein the halide solid state electrolyte layer is disposed on and in contact with the composite cathode; wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or11625-006WO1; EX_ID_1038 and 1039 a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte.

45. The solid state battery of claim 44, further comprising an anode, wherein the halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode.

46. A solid state battery comprising: an anode; a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any one of claims 1-33; and a composite cathode; wherein the halide solid state electrolyte layer is sandwiched between and in contact with the anode and the composite cathode; wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte.

47. The solid state battery of claim 46, further comprising an interfacial layer comprising an interfacial material, wherein: the interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer; the halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode; the anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window; and the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode.

48. A solid state battery comprising: an anode; an interfacial layer comprising an interfacial material;11625-006WO1; EX_ID_1038 and 1039 a halide solid state electrolyte layer, the halide solid state electrolyte layer being a layer comprising a first halide solid state electrolyte, wherein the first halide solid state electrolyte is the solid state lithium ion conductor of any one of claims 1-33; and a composite cathode; wherein the interfacial layer is sandwiched between and in contact with the anode and the halide solid state electrolyte layer; wherein the halide solid state electrolyte layer is sandwiched between and in contact with the interfacial layer and the composite cathode; wherein the anode, the interfacial layer, the halide solid state electrolyte layer, and the composite cathode each has an electrochemical stability window; wherein the electrochemical stability window of the interfacial layer overlaps with that of the halide solid state electrolyte layer and the anode; and wherein the composite cathode comprises a cathode active material, a conductive additive, and an electrolyte; wherein the electrolyte comprises: a plurality of particles comprising a second halide solid state electrolyte; or a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte.

49. The solid state battery of claim 47 or claim 48, wherein the interfacial layer is formed in situ.

50. The solid state battery of any one of claims 47-49, wherein the interfacial layer has an average thickness of from 1 nanometers (nm) to 100 micrometers (microns, ^m).

51. The solid state battery of any one of claims 47-50, wherein the interfacial layer has an average thickness of from 1 micrometer (micron, ^m) to 20 micrometers.

52. The solid state battery of any one of claims 47-51, wherein the interfacial layer has an ionic conductivity of lithium of from 1 × 10-8Scm-1to 0.1 Scm-1.

53. The solid state battery of any one of claims 47-52, wherein the interfacial material comprises Li6PS5X (where X is Cl, Br, or I), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3xLa2 / 3-xTiO3 (lithium lanthanum titanate (LLTO) perovskite), Li3N, Li3P, Li3PS4, LiBH4, Li2+2xZn1íxGeO4, Li1+xAlxTi2-x(PO4)3 (LATP), Li1+xAlxGe2-x(PO4)3 (LAGP), Li10GeP2S12 (LGPS), derivatives thereof (e.g., doped versions thereof), or a combination thereof.11625-006WO1; EX_ID_1038 and 1039 54. The solid state battery of any one of claims 47-53, wherein the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3N, Li3PS4, Li3P, or a combination thereof.

55. The solid state battery of any one of claims 47-54, wherein the interfacial material comprises Li6PS5Cl (LPSCl), Li7P3S11 (LPS), garnet Li7La3Zr2O12 (LLZO), Li3PS4, or a combination thereof.

56. The solid state battery of any one of claims 47-55, wherein the interfacial layer comprises a plurality of particles of the interfacial material.

57. The solid state battery of claim 56, wherein the plurality of particles of the interfacial material have an average particle size of from 1 nanometer (nm) to 25 micrometers (microns, µm).

58. The solid state battery of claim 56 or claim 57, wherein the plurality of particles of the interfacial material have an average particle size of from 100 nanometers (nm) to 10 micrometers (microns, µm).

59. The solid state battery of any one of claims 45-58, wherein the anode is formed in situ.

60. The solid state battery of any one of claims 45-59, wherein the anode has a high capacity and / or a high energy density.

61. The solid state battery of any one of claims 45-60, wherein the anode has a specific capacity of from 100 to 4000 mAh / g.

62. The solid state battery of any one of claims 45-61, wherein the anode has a low intercalation voltage.

63. The solid state battery of any one of claims 45-62, wherein the anode has an intercalation voltage of as 1 V or less versus Li+ / Li0.

64. The solid state battery of any one of claims 45-63, wherein the anode comprises a metal, an alloy, an intercalation material, or a combination thereof.

65. The solid state battery of any one of claims 45-64, wherein the anode comprises lithium, silicon, indium, graphite, hard carbon, or a combination thereof.11625-006WO1; EX_ID_1038 and 1039 66. The solid state battery of any one of claims 45-65, wherein the anode comprises lithium (e.g., lithium metal and / or a lithium alloy).

67. The solid state battery of any one of claims 45-66, wherein the anode comprises lithium metal.

68. The solid state battery of any one of claims 45-67, wherein the anode comprises a lithium alloy.

69. The solid state battery of any one of claims 45-68, wherein the anode comprises a lithium-indium alloy, a lithium-magnesium alloy, a lithium-aluminum alloy, a lithium-iron alloy, or a combination thereof.

70. The solid state battery of any one of claims 45-69, wherein the anode comprises a lithium-indium alloy.

71. The solid state battery of any one of claims 45-70, wherein the anode comprises silicon or a silicon composite.

72. The solid state battery of any one of claims 45-71, wherein the anode is a composite (e.g., a composite anode).

73. The solid state battery of claim 72, wherein the composite anode further includes a binder.

74. The solid state battery of claim 73, wherein the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof.

75. The solid state battery of any one of claims 72-74, wherein the composite anode further includes a conductive additive.

76. The solid state battery of claim 75, wherein the conductive additive comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof.11625-006WO1; EX_ID_1038 and 1039 77. The solid state battery of claim 75 or claim 76, wherein the conductive additive comprises carbon black.

78. The solid state battery of any one of claims 45-77, wherein the anode comprises a prelithiated host structure (e.g., a prelithiated silicon anode, a prelithiated silicon-graphite composite anode, a prelithiated graphite, a prelithiated hard carbon, etc.), a silicon-graphite composite anode, or a combination thereof.

79. The solid state battery of any one of claims 44-78, wherein the halide solid state electrolyte layer has an average thickness of from 1 to 100 micrometers (microns, µm).

80. The solid state battery of any one of claims 44-79, wherein the halide solid state electrolyte layer comprises a plurality of particles of the first halide solid state electrolyte.

81. The solid state battery of claim 80, wherein the plurality of particles of the first halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 100 micrometers (microns, µm).

82. The solid state battery of claim 80 or claim 81, wherein the plurality of particles of the first halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers.

83. The solid state battery of any one of claims 44-82, wherein the electrochemical stability window of the halide solid state electrolyte is compatible with the electrochemical stability window of the composite cathode.

84. The solid state battery of any one of claims 44-83, wherein the cathode active material comprises a high density nickel-rich layered transition metal oxide (e.g., Li[NixMnyCoz]O2 (x+y+z = 1)), LiFe1-xMnxPO4 (LMFP), a lithium iron phosphate (LFP, LiFePO4), lithium manganese oxide (LiMn2O4), nickel-doped lithium manganese oxide (Li[Ni0.5Mn1.5]O4), LiCoO2, LiNiO2, or a combination thereof.

85. The solid state battery of any one of claims 44-84, wherein the cathode active material comprises Li[NixMnyCoz]O2 where x+y+z = 1, LiFePO4, or a combination thereof.

86. The solid state battery of any one of claims 44-85, wherein the conductive additive comprises a carbon black, a modified carbon black, a graphene, a multi-layer graphene, carbon11625-006WO1; EX_ID_1038 and 1039 fibers, carbon nanotubes, carbon nanospheres, graphite, a reduced graphene oxide, or a combination thereof.

87. The solid state battery of any one of claims 44-86, wherein the conductive additive comprises carbon black.

88. The solid state battery of any one of claims 44-87, wherein the composite cathode further comprises a binder.

89. The solid state battery of claim 88, wherein the binder comprises a polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), cellulose, carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP), ethyl cellulose (EC), copolymers thereof, derivatives thereof, or a combination thereof.

90. The solid state battery of any one of claims 44-89, wherein the solid state battery is an all solid state battery.

91. The solid state battery of claim 90, wherein the electrolyte of the composite cathode is a plurality of particles comprising a second halide solid state electrolyte.

92. The solid state battery of claim 91, wherein the second halide solid state electrolyte has an ionic conductivity of lithium of from 1 × 10-6Scm-1to 1 Scm-1.

93. The solid state battery of claim 91 or claim 92, wherein the second halide solid state electrolyte comprises a lithium halide, a sodium halide, or a combination thereof.

94. The solid state battery of any one of claims 91-93, wherein the second halide solid state electrolyte comprises a lithium halide.

95. The solid state battery of any one of claims 91-94, wherein the second halide solid state electrolyte comprises the solid state lithium ion conductor of any one of claims 1-33.

96. The solid state battery of any one of claims 91-94, wherein the second halide solid state electrolyte comprises Li3-zM[III+z]X6, where X is one or more halides, z is an integer from -2 to 2, and [III+z] represents the valence of the M-ion(s) in the compound.

97. The solid state battery of any one of claims 91-96, wherein the second halide solid state electrolyte and the first halide solid state electrolyte are the same.11625-006WO1; EX_ID_1038 and 1039 98. The solid state battery of any one of claims 91-96, wherein the second halide solid state electrolyte and the first halide solid state electrolyte are different.

99. The solid state battery of any one of claims 91-98, wherein the plurality of particles of second halide solid state electrolyte have an average particle size of from 1 nanometer (nm) to 50 micrometers (microns, µm).

100. The solid state battery of any one of claims 91-99, wherein the plurality of particles of second halide solid state electrolyte have an average particle size of from 100 nanometers to 20 micrometers.

101. The solid state battery of any one of claims 91-100, wherein the average particle size of the plurality of particles of the first halide solid state electrolyte and the average particle size of the plurality of particles of the second halide solid state electrolyte are the same.

102. The solid state battery of any one of claims 91-100, wherein the average particle size of the plurality of particles of the first halide solid state electrolyte and the plurality of particles of the second halide solid state electrolyte are different.

103. The solid state battery of any one of claims 44-89, wherein the solid state battery is a pseudo solid state battery.

104. The solid state battery of claim 103, wherein the electrolyte of the composite cathode is a liquid electrolyte, a polymer electrolyte, and / or a gel electrolyte.

105. The solid state battery of any one of claims 44-104, wherein the solid state battery further comprises a first current collector, wherein: when the anode is present, the anode is sandwiched between and in contact with the first current collector and the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent); and when the anode is absent, the first current collector is in contact with the interfacial layer (when present) or the halide solid state electrolyte layer (when the interfacial layer is absent).

106. The solid state battery of any one of claims 44-105, wherein the solid state battery further comprises a second current collector, wherein the cathode is sandwiched between and in contact with the second current collector and the halide solid state electrolyte layer.11625-006WO1; EX_ID_1038 and 1039 107. The solid state battery of claim 105 or claim 106, wherein the first current collector and / or the second current collector (when present) independently comprise a metal, a carbon material, or a combination thereof.

108. The solid state battery of any one of claims 44-107, wherein the solid state battery further includes a casing that at least partially surrounds and / or encloses a cell comprising the anode (when present), the interfacial layer (when present), the halide solid state electrolyte layer, the composite cathode, the first current collector (when present), and the second current collector (when present).

109. The solid state battery of claim 108, wherein the casing comprises a polymer, a metal, an alloy, a polymer coated metal foil, or a combination thereof.

110. The solid state battery of any one of claims 45-109, wherein the anode is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery.

111. The solid state battery of any one of claims 44-110, wherein the interfacial layer is substantially free of dendrites during a plating / stripping cycle of operation of the solid state battery.

112. The solid state battery of any one of claims 44-111, wherein the solid state battery exhibits an energy density of from 75 Wh / kg to 600 Wh / kg.

113. The solid state battery of any one of claims 44-112, wherein the solid state battery exhibits a specific discharge capacity of from 100 mA h / g to 400 mA h / g when discharged at a rate of from 0.1 C to 10 C.

114. The solid state battery of any one of claims 44-113, wherein the solid state battery is rechargeable.

115. The solid state battery of any one of claims 44-114, wherein the solid state battery exhibits a coulombic efficiency of 80% or more for 100 cycles or more.

116. The solid state battery of any one of claims 44-115, wherein the solid state battery exhibits a coulombic efficiency of 99% or more for 100 cycles or more.

117. The solid state battery of any one of claims 44-116, wherein the solid state battery exhibits a capacity retention of 80% or more for 100 cycles or more.11625-006WO1; EX_ID_1038 and 1039 118. The solid state battery of any one of claims 44-117, wherein the solid state battery exhibits a capacity retention of 90% or more for 100 cycles or more.

119. A method of making the solid state battery of any one of claims 44-118.

120. The method of claim 119, wherein the method comprises a dry chemical process in which the cathode and anode (when present) are produced separately and the halide solid state electrolyte material and the interfacial layer (when present) are produced as freestanding films or membranes and the entire cell is sandwiched together.

121. The method of claim 119, wherein the method comprises an iterative wet chemical process where a composite cathode slurry is deposited on the cathode current collector and dried, then a slurry comprising the halide solid state electrolyte (and optionally a binding agent) is deposited on the dried cathode and dried, and subsequently the process is repeated for the interfacial layer (when present), before the anode (when present) is placed on top.

122. A system comprising one or more of the solid state batteries of any one of claims 46-118.

123. The system of claim 122, wherein the system is an energy storage system.

124. An article comprising one or more of the solid state batteries of any one of claims 46- 118. The article of claim 124, wherein the article is a vehicle, such as a hybrid electric vehicle or an all-electric vehicle.

126. The article of claim 124, wherein the article comprises an electronic device, such as a portable electronic device, a laptop, a watch, or a cell phone.

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