SOLID-BODY BATTERIES

Abstract

Solid-state battery cell, comprising: A Anode electrodes with an anode active material layer arranged on an anode current collector; C Cathode electrodes with a cathode active material layer arranged on a cathode current collector, the cathode active material layer comprising: Cathode active material with particles comprising an outer layer of lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3), where the BET surface area of ​​the particles is in a range of 0.2 to 0.8 m² 2 / g lies; and a solid electrolyte with a D 50 -Size in the range of 4 µm to 12 µm; and S separators arranged between the A anode electrodes and the C cathode electrodes, where A, C and S are integers greater than one.

Description

INTRODUCTION

[0001] The information contained in this section serves to present the general context of the disclosure. Works of the inventors mentioned herein, insofar as they are described in this section, as well as aspects of the description that may not have been prior art at the time of filing, are neither expressly nor implicitly recognized as prior art contrary to the present disclosure.

[0002] Solid-state batteries, which are prior art, are described in US 2018 / 0287209 A1, US 2022 / 0302526 A1, and US 2023 / 0113174 A1. The present disclosure relates to battery cells and, in particular, to high-performance cathode electrodes for solid-state batteries.

[0003] Electric vehicles (EVs), such as battery electric vehicles (BEVs), hybrid vehicles, and / or fuel cell vehicles, comprise one or more electric motors and a battery system with one or more battery cells, modules, and / or packs. A power control system is used to manage the charging and / or discharging of the battery system during charging and / or driving. SUMMARY

[0004] The subject matter of the present invention comprises a solid-state battery cell according to claim 1. Preferred embodiments are described in the dependent claims. A solid-state battery cell comprises A anode electrodes with an anode active material layer arranged on an anode current collector, and C cathode electrodes with a cathode active material layer arranged on a cathode current collector. The cathode active material layer comprises cathode active material with particles comprising an outer layer of lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3), wherein the BET surface area of ​​the particles is in the range of 0.2 to 0.8 m². 2 / g. A solid electrolyte has a D 50 -Size ranges from 4 µm to 12 µm. S separators are arranged between the A anode electrodes and the C cathode electrodes, where A, C and S are integers greater than one.

[0005] In other cases, the particles consist of lithium nickel cobalt manganese (NMC) particles and an outer layer of LiNbO3 and Li2ZrO3. The NMC particles have a diameter of 2 µm. <D 50 < 5 µm. Nickel comprises 50 to 72 mol% of the NMC particles, manganese comprises 8 to 40 mol% of the NMC particles, and cobalt comprises 10 to 20 mol% of the NMC particles. The outer layer has a thickness between 7 nm and 13 nm. The solid electrolyte in the cathode active material layer has a diameter D 90 < 15 µm. The solid electrolyte comprises a sulfide solid electrolyte selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide.

[0006] In other cases, the solid electrolyte is selected from a group consisting of halide-based and hydride-based solid electrolytes. The cathode active material is selected from a group consisting of rock salt layered oxides, spinel, polyanion cathodes, olivine cathodes, other lithium transition metal oxides, surface-coated and / or doped cathode materials, and combinations thereof. The cathode active material layer further comprises a conductive additive selected from a group consisting of carbon black, graphite, graphene, graphene oxide, Super P (registered trademark), acetylene black, carbon nanofibers, carbon nanotubes, and combinations thereof.The cathode active material layer further comprises a binder selected from a group consisting of polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), poly(vinylidene fluoride) (PVDF), nitrile butadiene rubber (NBR), styrene-ethylene-butylene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS) and combinations thereof.

[0007] Not according to the invention: A dry method for producing a cathode electrode for a solid-state battery cell comprises mixing cathode active material, comprising particles with an outer layer comprising LiNbO3 and Li2ZrO3, and a solid electrolyte, comprising particles with a D 50-Size in the range of 4 µm to 12 µm. Addition of a binder and a conductive additive to the cathode active material and the solid electrolyte. Coating of a substrate with cathode active material, the solid electrolyte, the binder, and the conductive additive.

[0008] For other characteristics, the cathode active material is selected from a group consisting of rock salt layered oxides, spinel, polyanion cathodes, olivine cathodes, other lithium transition metal oxides, and surface-coated and / or doped cathode materials. The solid electrolyte is selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, pseudoquaternary sulfide, a halide-based solid electrolyte, and a hydride-based solid electrolyte.

[0009] For other characteristics, the conductive additive is selected from a group consisting of carbon black, graphite, graphene, graphene oxide, Super P (registered trademark), acetylene black, carbon nanofibers, and carbon nanotubes. The binder is selected from a group consisting of polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP) fibrils, perfluoroalkoxyalkane (PFA) fibrils, and / or ethylene tetrafluoroethylene (ETFE) fibrils.

[0010] In other respects, the cathode active material comprises lithium nickel cobalt manganese (NMC) particles with a diameter of 2 µm. <D 50 < 5 µm and the outer layer comprises LiNbO3 with a thickness in the range of 7 nm to 13 nm. Nickel comprises 50 to 72 mol% of the NMC particles, Mn comprises 8 to 40 mol% of the NMC particles, and Co comprises 10 to 20 mol% of the NMC particles.

[0011] Not according to the invention: A wet process for producing a cathode electrode for a solid-state battery cell, in which a mixture is produced comprising a cathode active material comprising particles with an outer layer comprising LiNbO3 and Li2ZrO3, a solid electrolyte comprising particles with a D 50 The mixture comprises a binder, a conductive additive, and a solvent, with a particle size ranging from 4 µm to 12 µm. The process involves applying the mixture to a substrate.

[0012] For other characteristics, the cathode active material is selected from a group consisting of rock salt layered oxides, spinel, polyanion cathodes, olivine cathodes, other lithium transition metal oxides, and surface-coated and / or doped cathode materials. The solid electrolyte is selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, pseudoquaternary sulfide, a halide-based solid electrolyte, and a hydride-based solid electrolyte.

[0013] For other characteristics, the conductive additive is selected from a group consisting of carbon black, graphite, graphene, graphene oxide, Super P (registered trademark), acetylene black, carbon nanofibers, and carbon nanotubes. The binder is selected from a group consisting of sodium carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyvinylidene fluoride (PVDF), nitrile butadiene rubber (NBR), styrene-ethylene-butylene-styrene copolymer (SEBS), and styrene-butadiene-styrene copolymer (SBS).

[0014] In other respects, the cathode active material comprises lithium nickel cobalt manganese (NMC) particles with a diameter of 2 µm < D 50 < 5 µm and the outer layer comprises LiNbO3 with a thickness in the range of 7 nm to 13 nm. Nickel comprises 50 to 72 mol% of the NMC particles, manganese comprises 8 to 40 mol% of the NMC particles, and cobalt comprises 10 to 20 mol% of the NMC particles.

[0015] Further applications of the present disclosure will become apparent from the detailed description, the claims, and the drawings. The detailed description and the specific examples serve only for illustration and are not intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present disclosure will be better understood from the detailed description and the accompanying drawings, whereby: Fig. 1 a lateral cross-sectional view of an example of a solid-state battery cell with cathode electrodes, anode electrodes and separators arranged in a battery cell housing according to the present disclosure; Fig. 2 a more detailed lateral cross-sectional view of an example of a solid-state battery cell with cathode electrodes, anode electrodes and separators according to the present disclosure; Fig. 3 a lateral cross-sectional view of particles of the cathode active material with an outer layer of lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3) and optionally lithium phosphate (Li3PO4) according to the present disclosure; Fig. 4A is a diagram that shows the voltage as a function of the capacitance for different sizes of solid electrolytes; Fig. 4B is a diagram that shows the impedance for different sizes of solid electrolytes; Fig. 4C is a diagram that shows the capacity as a function of cycles for different sizes of solid electrolytes; Fig. 5 is a flowchart that represents an example of dry processing of the cathode electrodes according to the present disclosure; Fig. 6 is a flowchart that provides an example of wet processing of the cathode electrodes according to the present disclosure; Fig. 7 enlarged views of the solid electrolyte and the electrodes for different sizes of the solid electrolyte according to the present disclosure; and Fig. Figure 8 shows enlarged views illustrating the dispersion of the solid electrolyte in the cathode electrodes for different sizes of solid electrolyte according to the present disclosure.

[0017] Reference symbols can be reused in the drawings to identify similar and / or identical elements. DETAILED DESCRIPTION

[0018] While high-performance cathodes for solid-state battery cells (SSB) are shown in connection with electric vehicles according to the present disclosure, the high-performance cathodes for solid-state battery cells can be used in stationary applications and / or other applications.

[0019] A sulfide electrolyte can provide an ionic conductivity comparable to that of carbonate-based electrolytes. However, the performance of a composite cathode electrode with a sulfide electrolyte is impaired by the sluggish ion transport at the interface between the active material and the solid electrolyte, and by the unfavorable ionic conductivity resulting from poor percolation of the solid electrolyte within the electrode.

[0020] A high-performance cathode electrode for a pure solid-state battery (ASSB) according to the present disclosure comprises single-crystal cathode particles with an outer layer of lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3) to prevent interfacial side reactions. The cathode particles are used with a solid electrolyte of a predetermined size to enable efficient ion transport within the cathode electrode. If the solid electrolyte particles in the cathode are too small, strong percolation of the solid electrolyte occurs, resulting in reduced ion transport. Larger solid electrolyte particles exhibit higher porosity and poorer percolation of the solid electrolyte. The thickness of the coating on the cathode particles is also optimized to prevent chemical reactions (which would occur without a coating) while simultaneously optimizing lithium ion transport.

[0021] The cathode electrode can, for example, comprise lithium nickel manganese cobalt (NMC) particles coated with a lithium niobate (LiNbO3) coating (e.g., with a thickness of 10 µm) to inhibit interfacial side reactions. The size of the sulfide solid electrolyte particles (e.g., D) 50 The diameter (e.g., 8 µm) is chosen to allow for efficient ion transport within the cathode electrode. The high-performance composite cathode electrode can, for example, deliver a 3C discharge capacity of 88 mAh / g and a 5C discharge capacity of 74 mAh / g at 25 °C.

[0022] With the following reference to Fig. 1 comprises a solid-state battery cell 10 C, cathode electrodes 20, A anode electrodes 40, and S separators 32, arranged in a predetermined sequence in a stack 12 within a housing 50, where C, S, and A are integers greater than zero. The C cathode electrodes 20-1, 20-2, ..., and 20-C comprise cathode active layers 24 arranged on one or both sides of the cathode current collectors 26. The A anode electrodes 40-1, 40-2, ..., and 40 comprise anode active layers 42 arranged on one or both sides of the anode current collectors 46.

[0023] In some examples, the anode active layers 42 and / or the cathode active layers 24 are freestanding electrodes arranged alongside (or attached to) the current collectors. In some examples, the anode active layers 42 and / or the cathode active layers 24 comprise coatings of one or more active materials, one or more conductive fillers / additives, and / or one or more binders applied to the current collectors. In some examples, the cathode current collectors 26 and / or the anode current collectors 46 comprise wire mesh, foil, and / or expanded metal. In some examples, the current collectors are made of one or more materials selected from a group consisting of copper, stainless steel, brass, bronze, zinc, aluminum, and / or their alloys.The external tabs 28 and 48 can be connected to the current collectors of the cathode electrodes and anode electrodes on the same or opposite sides of the battery stack.

[0024] With the following reference to Fig. 2 and Fig. Figure 3 shows a more detailed example of the solid-state battery cell. Fig. 2 comprises the cathode active material layer 24, cathode active material 210, and solid electrolyte 212 (e.g., sulfide solid electrolyte). The separator 32 comprises a solid electrolyte 220 (e.g., a sulfide solid electrolyte). The anode active material layer 40 comprises anode active material 230 and solid electrolyte 232 (e.g., sulfide solid electrolyte).

[0025] In Fig. 3 comprises the cathode active material 210, single-crystal particles 250 of the cathode active material, and an outer layer 252 applied or otherwise deposited onto a radially outer surface of the particles 250. In some examples, the particles 250 comprise NMC or another cathode active material described below. According to the invention, the outer layer 252 comprises lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3), although other materials may also be used. In some examples, the NMC particles 250 comprise 68 wt.% to 92 wt.% and the outer layer 8 wt.% to 32 wt.%. In some examples, the weight ratio between the particles 250 and the outer layer 252 is 70:30. In some examples, the coated NMC particles inhibit interfacial side reactions, and the solid electrolyte enables efficient ion transport pathways in the cathode electrode.

[0026] In some examples, the particles 250 have a diameter of 2µm < D 50 < 5 µm (e.g., 3.8 µm). According to the invention, the surface area of ​​the particles, as defined by Brunauer, Emmett, and Teller (BET), lies in a range of 0.2 to 0.8 m². 2 / g. In some examples, nickel (Ni) comprises 50 to 72 mol% of the NMC particles, manganese (Mn) comprises 8 to 40 mol%, and cobalt (Co) comprises 10 to 20 mol%. In some examples, the outer layer 252 has a thickness in the range of 7 nm to 13 nm (e.g., 10 nm). In some examples, the sulfide electrolyte 212 has a diameter of 4 µm < D 50 < 12 µm (e.g. 8 µm) and D 90 < 15 µm (e.g., 14.7 µm). In some examples, the sulfide electrolyte 212 has a diameter of 5 µm < D 50 < 10 µm. The ionic conductivity is greater than 1 mS / cm.

[0027] With the following reference to Fig. Sections 4A to 4C show the performance of NMC particles with outer layers of different thicknesses. Fig. 4A shows the voltage as a function of the capacity (mAh / g) for NMC without the outer layer (at 300), NMC with a 5 nm outer layer (at 305), NMC with a 10 nm outer layer (at 310), and NMC with a 15 nm outer layer (at 315). Some of the coated NMC examples (e.g., 5 nm and 10 nm coatings) outperform the uncoated NMC. In Fig. Figure 4B shows the impedance of coated and uncoated NMC. Some of the coated NMC examples (e.g., 5 nm and 10 nm coatings) exhibit lower resistance.

[0028] In Fig. 4C shows the capacitance as a function of cycles. Some of the coated NMC examples (e.g., 5 nm and 10 nm coatings) exhibit higher capacitance than uncoated NMC. As can be seen, the LiNbO3 coating (according to the invention, if it also includes Li2ZrO3) enables an electrochemically stable NMC / SE interface. NMC with the 10 nm coating exhibits the lowest interface resistance with sulfide electrolyte.

[0029] With the following reference to Fig. Figure 5 shows a process 400 for manufacturing a cathode electrode in a dry process. In Figure 410, coated cathode active material and solid sulfide electrolyte particles are mixed. In Figure 414, a binder and a conductive additive are added to the coated cathode active material and the solid sulfide electrolyte and mixed. In Figure 416, the mixture is sheared (e.g., to fibrill the binder) and pressed and / or rolled to form a freestanding cathode membrane. In Figure 418, the membrane is attached to a cathode current collector. In some examples, one or more sets of rollers may be used to apply pressure and / or heat (or another device may be used). In Figure 426, anode electrodes, the cathode electrodes, and separators are arranged in a battery cell.

[0030] With the following reference to Fig. Figure 6 shows a method 500 for manufacturing a cathode electrode. Figure 510 shows the coated cathode active material, the solid sulfide electrolyte, the solvent, the binder, and the conductive additive being mixed. Figure 514 shows the mixture being applied to a cathode current collector. Figure 518 shows the mixture being pressed and / or heated with a roller or other device to form the cathode electrode. Figure 522 shows the anode electrodes, the cathode electrodes, and the separators arranged in a battery cell.

[0031] With the following reference to Fig. 7 and Fig. Section 8 shows the influence of the size of the sulfide solid electrolyte. Fig. Figure 7 shows enlarged views of the solid electrolyte and the cathode electrode. When using 5 µm and 8 µm electrodes, the cathode electrode is packed most tightly after pressing. Random sizes and larger sizes (e.g., 15 µm) exhibit voids after pressing. Fig. 8. The distribution of the sulfide solid electrolyte is more uniform at 5 µm and 8 µm than at random or larger sizes (e.g. 15 µm).

[0032] In some examples, the solid electrolyte comprises a sulfide solid electrolyte selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide, and pseudoquaternary sulfide. Examples of pseudobinary sulfides include the Li₂S-P₂S₅ system (Li₃PS₄, Li₇P₃S₅). 11 and Li 9,6 P3S 12), the Li2S-SnS2 system (Li4SnS4), the Li2S-SiS2 system, the Li2S-GeS2 system, the Li2S-B2S3 system, the Li2S-Ga2S3 system, the Li2S-P2S3 system, the Li2S-Al2S3 system and combinations thereof.

[0033] Examples of pseudoternary sulfides are the Li2O-Li2S-P2S5 system, the Li2S-P2S5-P2O5 system, the Li2S-P2S5-GeS2 system (e.g. Li 3,25 Ge 0,25 P 0,75 S4 and Li 10 GeP2S 12 ), the Li2S-P2S5-LiX(X = F, Cl, Br, I) system (Li6PS5Br, Li6PS5Cl, L7P2S8I and Li4PS4I), the Li2S-As2S5-SnS2 system (Li 3,833 Sn 0,833 As 0,166 S4), the Li2S-P2S5-Al2S3 system, the Li2S-LiX-SiS2 (X = F, Cl, Br, I) system, 0.4LiI-0.6Li4SnS4, Li 11 Si2PS 12 , and combinations thereof.

[0034] Examples of pseudoquaternary sulfides include the Li2O-Li2S-P2S5-P2O5 system, Li 9,54 Si 1,74 P 1,44 S 1,7 Cl 0,3 , Li7P 2,9 Mn 0,1 S 10,7 I 0,3 , Li10,35 [Sn 0,27 Si 1,08 ]P 1,65 S 12 , and combinations thereof.

[0035] In other examples, the solid electrolyte comprises a halide-based solid electrolyte, a hydride-based solid electrolyte, or another solid electrolyte exhibiting low grain boundary resistance. Examples of halide-based solid electrolytes include Li3YCl6, Li3InCl6, Li3YBr6, Li11, and Li2CdC. 14 , Li2MgC 14 , Li2Cd 14 , Li2Zn 14 and Li3OCl. Examples of hydride-based solid electrolytes include LiBH4, LiBH4-LiX (X = Chlorine (Cl), Bromine (Br) or Iodine (I)), LiNH2, Li2NH, LiBH4-LiN H2, Li3AlH6 and combinations thereof.

[0036] In some examples, the cathode active material is selected from a group consisting of rock salt layered oxides, spinel, polyanion cathodes, olivine cathodes, other lithium transition metal oxides, surface-coated and / or doped cathode materials, and low-voltage cathode materials.

[0037] In some examples, the anode active material is selected from a group consisting of carbon-containing material (e.g., graphite, hard carbon, soft carbon, etc.), silicon, silicon mixed with graphite, Li4Ti5O 12 , transition metals (e.g. tin (Sn)), metal oxide / sulfide (e.g. titanium oxide (TiO2), iron sulfide (FeS) etc.) and other lithium-absorbing anode materials.

[0038] Examples of rock salt layer oxides (LiCoO2, LiNiLiNi) x Mn y Co 1-x-y O2, LiNi x Mn y Al 1-x-y O2, LiNi x Mn 1-x O2, Li 1+xMO2). Examples of spinel include LiMn2O4, LiNi 0,5 Mn 1,5 O4. Examples of polyanion cathodes include LiV2(PO4)3). Examples of olivine include LiFePO4 and LiMn x Fe 1-x PO4.

[0039] Examples of surface-coated and / or doped cathode materials are mentioned above and further include LiNbO3 and Li2ZrO3-coated Li-Ni. x Mn y Co 1-x-y O2 and Al-doped LiMn2O4. Examples of low-voltage cathode materials include lithium-containing metal oxide / sulfide (e.g., LiTiS2), lithium sulfide, and sulfur.

[0040] In some examples, the conductive additive is selected from a group consisting of carbon black, graphite, graphene, graphene oxide, Super P (registered trademark), acetylene black, carbon nanofibers, carbon nanotubes and other electronically conductive additives.

[0041] In some examples, the binder is selected from a group consisting of polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), poly(vinylidene fluoride) (PVDF), nitrile butadiene rubber (N BR), styrene-ethylene-butylene-styrene copolymer (SEBS) and styrene-butadiene-styrene copolymer (SBS).

[0042] The foregoing description serves only for illustration and is not intended in any way to limit the disclosure, its application or use.

[0043] The comprehensive teachings of the disclosure can be implemented in a multitude of forms. Although this disclosure includes specific examples, the true scope of the disclosure should not be thereby restricted, since other modifications will become apparent upon study of the drawings, the description, and the following claims. It is understood that one or more steps within a process may be carried out in a different order (or simultaneously) without altering the principles of the present disclosure. Furthermore, although each of the embodiments described above has certain features, one or more of these features, described in relation to any embodiment of the disclosure, may be implemented in any other embodiment and / or combined with features of any other embodiment, even if such combination is not expressly described.In other words, the described embodiments are not mutually exclusive, and combinations of one or more embodiments remain within the scope of this disclosure.

[0044] Spatial and functional relationships between elements (e.g., between modules, circuit elements, semiconductor layers, etc.) are described using various terms, including "connected," "interlocking," "coupled," "adjacent," "next to," "above," "above," "below," and "arranged." If a relationship between a first and a second element is not explicitly described as "direct" in the above disclosure, this relationship may be a direct relationship in which no other intervening elements exist between the first and the second element, or it may be an indirect relationship in which one or more intervening elements (either spatial or functional) exist between the first and the second element.As used herein, the phrase “A, B and / or C” should be interpreted using a non-exclusive logical OR operation as logical (A OR-connected with B OR-connected with C) and not as “at least one of A, at least one of B and at least one of C”.

[0045] In the figures, the direction of an arrow, as indicated by the arrowhead, generally shows the flow of information (e.g., data or instructions) that is relevant to the illustration. For example, if Element A and Element B exchange a variety of information, but the information transmitted from Element A to Element B is relevant to the illustration, the arrow may point from Element A to Element B. This unidirectional arrow does not mean that no other information is transmitted from Element B to Element A. Furthermore, when information is sent from Element A to Element B, Element B may send requests for the information to Element A or acknowledge its receipt.

Claims

[1] Solid-state battery cell comprising: A Anode electrodes with an anode active material layer arranged on an anode current collector; C Cathode electrodes with a cathode active material layer arranged on a cathode current collector, the cathode active material layer comprising: Cathode active material with particles comprising an outer layer of lithium niobate (LiNbO3) and lithium zirconate (Li2ZrO3), where the BET surface area of ​​the particles is in a range of 0.2 to 0.8 m² 2 / g lies; and a solid electrolyte with a D 50 -Size in the range of 4 µm to 12 µm; and S separators arranged between the A anode electrodes and the C cathode electrodes, where A, C and S are integers greater than one. [2] Solid-state battery cell according to claim 1, wherein the particles comprise lithium nickel cobalt manganese (NMC) particles and the outer layer comprises LiNbO3. [3] Solid-state battery cell according to claim 2, wherein the NMC particles have a diameter of 2 µm < D 50 exhibit < 5 µm. [4] Solid-state battery cell according to claim 2, wherein nickel comprises 50 to 72 mol% of the NMC particles, manganese comprises 8 to 40 mol% of the NMC particles and cobalt comprises 10 to 20 mol% of the NMC particles. [5] Solid-state battery cell according to claim 1, wherein the outer layer has a thickness in the range of 7 nm to 13 nm. [6] Solid-state battery cell according to claim 1, wherein the solid electrolyte in the cathode active material layer has a diameter D 90 < 15 µm. [7] Solid-state battery cell according to claim 1, wherein the solid electrolyte comprises a sulfidic solid electrolyte selected from a group consisting of pseudobinary sulfide, pseudoternary sulfide and pseudoquaternary sulfide. [8] Solid-state battery cell according to claim 1, wherein the solid electrolyte is selected from a group consisting of halide-based solid electrolytes and hydride-based solid electrolytes. [9] Solid-state battery cell according to claim 1, wherein the cathode active material is selected from a group consisting of rock salt layered oxides, spinel, polyanion cathodes, olivine cathodes, other lithium transition metal oxides, surface-coated and / or doped cathode materials and combinations thereof. [10] Solid-state battery cell according to claim 1, wherein the cathode active material layer further comprises a conductive additive selected from the group consisting of carbon black, graphite, graphene, graphene oxide, Super P (registered trademark), acetylene black, carbon nanofibers, carbon nanotubes and combinations thereof.

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