Electrode laminate

Abstract

To provide an electrode laminate capable of suppressing breakage of a plurality of electrode collector layers or a collector tab connected to the electrode collector layers.SOLUTION: In an electrode laminate 100 comprising a plurality of multilayer battery units 110, each of the plurality of multilayer battery units 110 includes an anode collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode collector layer in this order. Regarding the electrode laminate, (i) the anode collector layer extends from a first end 110a of the multilayer battery unit 110, and the plurality of multilayer battery units 110 is laminated on each other in such a manner that a plurality of first ends 110a is disposed while being tilted and / or (ii) the cathode collector layer extends from a second end 110b of the multilayer battery unit 110, and the plurality of multilayer battery units 110 is laminated on each other in such a manner that the plurality of second ends 110b is disposed while being tilted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an electrode stack. [Background technology]

[0002] The battery electrode laminate has a plurality of laminated battery units, and the plurality of laminated battery units generally have a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer. The battery electrode laminate is sealed in an internal space surrounded by an exterior material such as a laminate film, and the following batteries are known.

[0003] Patent Document 1 discloses a battery cell in which an electrode assembly having a positive electrode / separator / negative electrode structure is housed in a battery case made of a laminate sheet having a resin layer and a metal layer, the electrode assembly being connected to electrode terminals protruding from the battery case, the electrode assembly having a separator sandwiched between a positive electrode and a negative electrode, each of which has a current collector coated with a mixture containing an electrode active material, at least a portion of the inner surface of the battery case corresponding to the outer surface of the electrode assembly has an upwardly inclined structure or a downwardly inclined structure in vertical cross section, the outer surface of the electrode assembly also having an upwardly inclined structure or a downwardly inclined structure corresponding to the inner surface of the battery case.The battery cell in Patent Document 1 is said to be able to increase the capacity of the battery cell in a safer and more efficient manner and ensure the safety of the battery cell.

[0004] Patent Document 2 discloses a battery having an electrode assembly, multiple current collecting tabs extending from a side surface of the electrode assembly, current collecting terminals connected to the multiple current collecting tabs, and a laminate film housing the electrode assembly and the multiple current collecting tabs, wherein the current collecting tabs have a base portion that is the end of the electrode assembly, a connection portion for connecting to the current collecting terminal, and an intermediate portion connecting the base portion and the connection portion, each of the multiple current collecting tabs has a laminated connection portion in which the connection portions are stacked in the thickness direction, and the current collecting terminal has at least a first surface, a second surface opposite the first surface, and a third surface connecting the first and second surfaces and facing the side surface of the electrode assembly, wherein seal portions of the laminate film are respectively arranged on the first surface and the second surface, and a main surface of the laminated connection portion is arranged on the third surface. Patent Document 2 discloses a battery that suppresses damage to the laminate film caused by the current collecting tabs. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2014-532262 [Patent Document 2] Japanese Patent Application Publication No. 2024-4737 Summary of the Invention [Problem to be solved by the invention]

[0006] For example, in a battery having a structure as disclosed in Patent Document 2, when the electrode current collector layer (negative electrode current collector layer and / or positive electrode current collector layer) or the current collector tab connected to the electrode current collector layer is collected and connected to a current collector terminal at a laminated connection part, the electrode current collector layer or the current collector tab connected to the electrode current collector layer is curved with a high curvature and subjected to a load, which may cause damage to the electrode current collector layer or the current collector tab connected to the electrode current collector layer.

[0007] Therefore, an object of the present disclosure is to provide an electrode stack that can prevent damage to multiple electrode collector layers (positive electrode collector layers and / or negative electrode collector layers) or collector tabs connected to the electrode collector layers. [Means for solving the problem]

[0008] The present disclosure achieves the above object by the following means.

[0009] <Aspect 1> An electrode stack having a plurality of stacked battery units, each of the plurality of stacked battery units includes at least an anode current collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode current collector layer in this order; (i) the negative electrode current collector layer extends from a first end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the first ends being inclined, and / or (ii) the positive electrode current collector layer extends from a second end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the second ends being inclined, Electrode stack. <Aspect 2> 2. The electrode stack of embodiment 1, wherein the plurality of stacked battery units have the same shape as one another. <Aspect 3> (i) and (ii) above are met, and the first end and the second end are opposite ends of the stacked battery unit; 3. The electrode stack according to claim 1 or 2. <Aspect 4> The electrode stack according to any one of aspects 1 to 3, current collecting terminals, and a laminate film that seals the electrode stack together with the current collecting terminals; A solid-state battery having: (a) the negative electrode current collector layers of the plurality of stacked battery units or the negative electrode current collector tabs connected to the negative electrode current collector layers are collected together to form a negative electrode stack connection part, and the negative electrode current collector layers and / or the negative electrode current collector tabs are curved, and the negative electrode stack connection part is connected, at an extending side surface of the negative electrode stack connection part, to an end surface of the current collector terminal that faces the first end part of the electrode stack, and the extending side surface of the negative electrode stack connection part is a surface of the negative electrode stack connection part from which the plurality of first end parts that are arranged at an angle extend, and / or (b) the positive electrode current collector layers or positive electrode current collector tabs connected to the positive electrode current collector layers of the plurality of stacked battery units are gathered together to form a positive electrode stack connection portion, and the positive electrode current collector layers and / or the positive electrode current collector tabs are curved, and the positive electrode stack connection portion is connected, at an extending side surface of the positive electrode stack connection portion, to an end surface of the current collector terminal that faces the second end portion of the electrode stack, and the extending side surface of the negative electrode stack connection portion is a surface of the negative electrode stack connection portion from which the plurality of second end portions that are arranged at an angle extend. solid state battery. [Effects of the Invention]

[0010] The electrode stack of the present disclosure can prevent damage to multiple electrode current collector layers (positive electrode current collector layers and / or negative electrode current collector layers) or to current collector tabs connected to the electrode current collector layers. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic cross-sectional view illustrating an electrode laminate according to the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view illustrating the electrode laminate of the present disclosure. [Figure 3] FIG. 3 is a schematic diagram illustrating an electrode laminate according to the present disclosure. [Figure 4] FIG. 4 is a cross-sectional schematic diagram illustrating a stacked battery unit included in the electrode stack of the present disclosure. [Figure 5]FIG. 5 is a schematic diagram illustrating the solid state battery of the present disclosure. [Figure 6] 6A is a schematic cross-sectional view illustrating a solid-state battery according to the present disclosure, and FIG. 6B is a schematic cross-sectional view illustrating a conventional solid-state battery. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the present disclosure. In addition, in the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted.

[0013] <Electrode laminate> The electrode stack of the present disclosure comprises: An electrode stack having a plurality of stacked battery units, each of the plurality of stacked battery units includes at least an anode current collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode current collector layer in this order; (i) the negative electrode current collector layer extends from a first end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the first ends arranged at an angle, and / or (ii) the positive electrode current collector layer extends from a second end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the second ends arranged at an angle.

[0014] The electrode stack of the present disclosure can prevent damage to multiple electrode current collector layers (positive electrode current collector layers and / or negative electrode current collector layers) or to current collector tabs connected to the electrode current collector layers.

[0015] Without being limited by theory, in a battery in which multiple electrode current collector layers or current collector tabs connected to the electrode current collector layers are collected to form a stacked connection portion, the electrode current collector layers extend from the end of the stacked battery unit, and the multiple stacked battery units are stacked on top of each other with the ends of the multiple stacked battery units arranged at an incline. This reduces the curvature of the curved electrode current collector layer or current collector tab connected to the electrode current collector layer, particularly on the surface facing the extending side of the stacked connection portion, even when the electrode current collector layer or current collector tab connected to the electrode current collector layer is curved and connected to a current collecting terminal, thereby preventing damage to the multiple electrode current collector layers or current collector tabs connected to the electrode current collector layers. Here, the extending side of the stacked connection portion is the surface of the stacked connection portion from which the inclined first end and / or second end extends.

[0016] FIG. 1 is a cross-sectional schematic diagram showing one embodiment of the electrode laminate of the present disclosure, but the present disclosure is not limited to this case.

[0017] First, the electrode stack of the present disclosure will be described with reference to a stacked battery unit 110 shown in FIG. 1A. The electrode stack 100 includes multiple stacked battery units 110, and negative electrode current collector layers 111 extend from first ends 110a of the stacked battery units 110. The multiple stacked battery units 110 are stacked on top of each other with the first ends 110a of the multiple stacked battery units 110 arranged at an angle. By arranging the stacked battery units 110 of the electrode stack 100 at an angle, even when, for example, multiple negative electrode current collector layers are collected, curved, and connected to a current collector terminal, the curvature of the negative electrode current collector layers is reduced, particularly on the surface of the negative electrode current collector layer (particularly, 111c shown in FIG. 6A) facing the extending side surface of the negative electrode stack connection portion, thereby preventing damage to the negative electrode current collector layers.

[0018] Next, the electrode stack of the present disclosure will be described with reference to a stacked battery unit 110 shown in FIG. 1B. A positive electrode current collector layer 115 extends from the second end 110b of the stacked battery unit 110. The stacked battery units 110 are stacked on top of each other with the second end 110b of each stacked battery unit 110 arranged at an angle. By arranging the stacked battery units 110 of the electrode stack 100 at an angle, even when, for example, multiple positive electrode current collector layers are collected, curved, and connected to a current collector terminal, the curvature of the positive electrode current collector layer is reduced, particularly on the surface of the positive electrode current collector layer (particularly 115c shown in FIG. 6A) facing the extending side surface of the positive electrode stack connection portion, thereby preventing damage to the positive electrode current collector layer.

[0019] 1A and 1B have been used to describe an electrode stack in which the first end of the stacked battery unit is inclined, and an electrode stack in which the second end of the stacked battery unit is inclined, but the electrode stack of the present disclosure is not particularly limited as long as the first end and / or the second end of the stacked battery unit is inclined. Furthermore, the first end and / or the second end of the stacked battery unit are not limited to being inclined in their entirety, and only a portion of them may be inclined.

[0020] In the present disclosure, the plurality of stacked battery units preferably have the same shape from the viewpoint of productivity, although this is not particularly limited. The term "same shape" may include, but is not limited to, errors that occur during the manufacturing of the stacked battery units.

[0021] FIG. 2 is a cross-sectional schematic diagram showing one embodiment of the electrode stack of the present disclosure, but the present disclosure is not limited to this case.

[0022] The electrode stack 100 shown in FIG. 2 has multiple battery units 110 of the same shape, with a negative electrode current collector layer 111 extending from a first end 110a of each battery unit 110 and a positive electrode current collector layer 115 extending from a second end 110b of each battery unit 110. The multiple battery units 110 are stacked on top of each other such that the first ends 110a of each battery unit 110 are tilted and the second ends 110b of each battery unit 110 are tilted. By tilting the battery units 110 of the electrode stack 100, even when the multiple negative electrode current collector layers and positive electrode current collector layers are respectively collected, curved, and connected to current collector terminals, the curvature of the negative electrode current collector layers and positive electrode current collector layers is reduced, thereby preventing damage to the negative electrode current collector layers and positive electrode current collector layers.

[0023] By making the multiple battery units the same shape, the electrode stack can be manufactured with higher productivity than when stacking battery units of different shapes and creating a sloped structure at the end of the electrode stack. Furthermore, because the multiple battery units have the same shape, when, for example, the first end 110a of the battery unit 110 is tilted, a sloped structure can also be formed at the opposing end of the battery unit.

[0024] In the present disclosure, the first end and the second end are not particularly limited, but may be opposite ends of the stacked battery unit. Furthermore, the first end and the second end do not have to be entirely tilted, and only a portion of each may be tilted.

[0025] 3A and 3B are schematic diagrams showing one embodiment of the electrode stack of the present disclosure, as viewed from the stacking direction of the electrode stack, but are not limited to this case.

[0026] 3A, the negative electrode current collector layer 111 and the positive electrode current collector layer 115 extend from opposite ends of the stacked battery unit 110, and the first end 110a and the second end 110b of the stacked battery unit are opposite ends of the stacked battery unit 110. On the other hand, in the electrode stack 100 shown in FIG. 3B, the negative electrode current collector layer 111 and the positive electrode current collector layer 115 extend from the stacked battery unit 110 and extend from the end on the same side of the stacked battery unit 110, and the first end 110a and the second end 110b of the stacked battery unit are ends on the same side of the stacked battery unit 110. 3A and 3B, the stacked battery units 110 are stacked one on top of another such that the first ends 110a of the stacked battery units 110 are inclined and the second ends 110b of the stacked battery units 110 are inclined. For example, even when the plurality of negative electrode current collector layers and positive electrode current collector layers are respectively collected, curved, and connected to current collector terminals, the curvature of the negative electrode current collector layers and positive electrode current collector layers is reduced, thereby preventing damage to the negative electrode current collector layers and positive electrode current collector layers. By making the first end and second end opposite each other, the positive and negative electrode terminals of the battery can be arranged at the opposite ends of the battery.

[0027] The first end portion and the second end portion do not necessarily have to be entirely inclined, and only a portion of each may be inclined.

[0028] In the present disclosure, the stacked battery unit has at least an anode current collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode current collector layer, in this order.

[0029] FIG. 4 is a cross-sectional schematic diagram showing one embodiment of a stacked battery unit included in the electrode stack of the present disclosure, but the present disclosure is not limited to this case.

[0030] The stacked battery unit 110 shown in Fig. 4A includes an anode current collector layer 111, an anode active material layer 112, a solid electrolyte layer 113, a cathode active material layer 114, and a cathode current collector layer 115. The stacked battery unit 110 shown in Fig. 4B includes a cathode current collector layer 115, a cathode active material layer 114, a solid electrolyte layer 113, an anode active material layer 112, an anode current collector layer 111, an anode active material layer 112, a solid electrolyte layer 113, a cathode active material layer 114, and a cathode current collector layer 115. Both the stacked battery units shown in Fig. 4A and Fig. 4B include an anode current collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode current collector layer, in this order. The stacked battery unit is not particularly limited, but may be a unit battery having a negative electrode current collector layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer in this order, or may be a plurality of the above unit batteries.

[0031] 《Solid-state battery》 The solid-state battery of the present disclosure comprises: The electrode stack described above, current collecting terminals, and a laminate film that seals the electrode stack together with the current collecting terminals; A solid-state battery having: (a) the negative electrode current collector layers of the plurality of stacked battery units or the negative electrode current collector tabs connected to the negative electrode current collector layers are collected together to form a negative electrode stack connection part, and the negative electrode current collector layers and / or the negative electrode current collector tabs are curved, and the negative electrode stack connection part is connected, at an extending side surface of the negative electrode stack connection part, to an end surface of the current collector terminal that faces the first end part of the electrode stack, and the extending side surface of the negative electrode stack connection part is a surface of the negative electrode stack connection part from which the plurality of first end parts that are arranged at an angle extend, and / or (b) The positive electrode current collector layers or positive electrode current collector tabs connected to the positive electrode current collector layers of the plurality of stacked battery units are gathered together to form a positive electrode stacking connection portion, and the positive electrode current collector layers and / or the positive electrode current collector tabs are curved, and the positive electrode stacking connection portion is connected, at an extending side surface of the positive electrode stacking connection portion, to an end surface of the current collector terminal that faces the second end portion of the electrode stack, and here the extending side surface of the negative electrode stacking connection portion is the surface of the negative electrode stacking connection portion from which the plurality of second end portions that are arranged at an angle extend.

[0032] According to the solid state battery of the present disclosure, damage to the plurality of electrode current collector layers or the current collector tabs connected to the electrode current collector layers can be suppressed.

[0033] If an electrode current collector layer of a solid-state battery or a current collector tab connected to an electrode current collector layer is damaged, there are concerns that the resistance of the solid-state battery will increase, the capacity of the solid-state battery will decrease, and there is also a concern that the solid-state battery may short-circuit. The solid-state battery of the present disclosure can suppress damage to multiple electrode current collector layers or current collector tabs connected to the electrode current collector layers, and is expected to thereby resolve the above concerns.

[0034] FIG. 5 is a schematic diagram showing one embodiment of the solid state battery of the present disclosure, showing an overall view of the solid state battery, but is not limited to this case.

[0035] FIG. 5A shows an electrode stack 100 and a current collecting terminal 200. The electrode stack 100 is electrically connected to the current collecting terminal 200 on one side by a negative electrode current collecting layer extending from a first end of a plurality of stacked battery units. The electrode stack 100 is also electrically connected to the current collecting terminal 200 on the side opposite the side by a positive electrode current collecting layer extending from a second end of a plurality of stacked battery units. FIG. 5B shows a solid-state battery 10. The solid-state battery 10 includes the electrode stack 100, the current collecting terminal 200, and a laminate film 300. In the solid-state battery 10, the electrode stack 100 and the current collecting terminal 200 are sealed by the laminate film 300.

[0036] FIG. 6A is a cross-sectional schematic diagram showing one embodiment of the solid-state battery of the present disclosure, but is not limited to this embodiment.

[0037] First, the solid-state battery 10 will be described near the first end 110a of the plurality of stacked battery units 110. The negative electrode current collector layers 111 of the plurality of stacked battery units 110 are joined together to form a negative electrode stack connection portion 111a. The negative electrode current collector layer 111 is curved, and the extending side surface 111b of the negative electrode stack connection portion 111a is connected to the end surface of the current collector terminal 200 that faces the first end 110a of the electrode stack 100. Here, the extending side surface 111b of the negative electrode stack connection portion is the surface of the negative electrode stack connection portion 111a from which the plurality of first end portions 110a, which are arranged at an angle, extend. By using the electrode stack 100 in which the first end 110a of the stacked battery unit 110 is stacked in an inclined position, a negative electrode stacking connection portion is formed, and the negative electrode current collector layer is curved, and even in a solid-state battery in which the negative electrode stacking connection portion is connected, on the extended side surface of the negative electrode stacking connection portion, to the end surface of the current collector terminal that faces the first end of the electrode stack, the curvature of the curved negative electrode current collector layer is reduced, and in particular the curvature of the curved negative electrode current collector layer (111c shown in FIG. 6A) on the surface that faces the extended side surface is reduced, thereby making it possible to prevent damage to the multiple negative electrode current collector layers.

[0038] Next, the solid-state battery 10 will be described near the second end 110b of the plurality of stacked battery units 110. The positive electrode current collector layers 115 of the plurality of stacked battery units 110 are joined together to form a positive electrode stack connection portion 115a. The positive electrode current collector layer 115 is curved, and the extended side surface 115b of the positive electrode stack connection portion is connected to the end surface of the current collector terminal 200 that faces the second end 110b of the electrode stack 100. Here, the extended side surface 115b of the positive electrode stack connection portion is the surface of the positive electrode stack connection portion 115a from which the plurality of second end portions 110b, which are arranged at an angle, extend. By using an electrode stack 100 in which the second end 110b of the stacked battery unit 110 is stacked in an inclined position, a positive electrode stacking connection portion is formed, and the positive electrode current collector layer is curved, and even in a solid-state battery in which the positive electrode stacking connection portion is connected to the end face of the current collector terminal that faces the second end of the electrode stack on the extended side face of the positive electrode stacking connection portion, the curvature of the curved positive electrode current collector layer is reduced, and in particular the curvature of the curved positive electrode current collector layer on the face that faces the extended side face (115c shown in FIG. 6A) is reduced, thereby making it possible to prevent damage to the multiple positive electrode current collector layers.

[0039] The first end portion and the second end portion do not necessarily have to be entirely inclined, and only a portion of each may be inclined.

[0040] FIG. 6B is a schematic cross-sectional view showing one embodiment of a solid-state battery in the prior art, but is not limited to this case.

[0041] In a solid-state battery 10 according to the prior art, a plurality of stacked battery units 110 are stacked to form an electrode stack 100, but the first end and second end are not tilted but are aligned. First, the vicinity of the first end 110a of the plurality of stacked battery units 110 in the solid-state battery 10 will be described. The negative electrode current collector layers 111 of the plurality of stacked battery units 110 are joined together to form a negative electrode stack joint 111a. The negative electrode stack joint 111a is formed by bending the negative electrode current collector layer 111 and connecting it to the end face of the current collector terminal 200 that faces the first end 110a of the electrode stack 100. In a solid-state battery as illustrated in FIG. 6B, the curvature of the curved negative electrode current collector layer becomes large, and in particular, the curvature of the negative electrode current collector layer on the surface of the negative electrode stack connection part farther from the current collector terminal (111c illustrated in FIG. 6B) becomes large, which may cause damage to the negative electrode current collector layer.

[0042] Next, the vicinity of the second end 110b of the plurality of stacked battery units 110 of the solid-state battery 10 will be described. The positive electrode current collector layers 115 of the plurality of stacked battery units 110 are joined together to form a positive electrode stack joint 115a. The positive electrode stack joint 115a is formed by bending the positive electrode current collector layer 115 and connecting it to the end face of the current collector terminal 200 that faces the second end 110b of the electrode stack 100. In a solid-state battery such as that shown in FIG. 6B, the curvature of the curved positive electrode current collector layer becomes large, particularly the curvature of the positive electrode current collector layer (115c shown in FIG. 6B) on the surface of the positive electrode stack joint farther from the current collector terminal, which may result in damage to the positive electrode current collector layer.

[0043] <<Applications of solid-state batteries>> The solid-state battery in the present disclosure may be, for example, an in-vehicle battery, or may be used as a power source for moving objects other than vehicles (for example, trains, ships, and aircraft), or may be used as a power source for electrical appliances such as information processing devices.

[0044] Electrode laminate and solid-state battery; each component The following describes each of the components of the electrode stack and the solid-state battery.

[0045] In the context of the present disclosure, a "solid-state battery" refers to a battery that uses at least a solid electrolyte as the electrolyte, and thus a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as the electrolyte. Also, in the context of the present disclosure, a solid-state battery may be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as the electrolyte.

[0046] In the present disclosure, a "composite" refers to a composition that can constitute an electrode active material layer, etc., either as it is or by further containing other components. Also, in the present disclosure, a "composite slurry" refers to a slurry that contains a dispersion medium in addition to a "composite" and can be applied and dried to form a positive electrode active material layer, etc.

[0047] The electrode stack includes a plurality of stacked battery units, and the solid-state battery includes the electrode stack, current collecting terminals, and a laminate film.

[0048] <Stacked battery unit> The stacked battery unit includes a negative electrode current collector layer, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer.

[0049] <Negative electrode current collector layer> The material used for the negative electrode current collector layer is not particularly limited, and any material commonly used for negative electrode current collectors in solid-state batteries can be appropriately used. Examples of materials used for the negative electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and carbon sheet. The negative electrode current collector layer may have a coating layer on its surface for the purpose of adjusting resistance, etc.

[0050] The shape of the negative electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0051] The thickness of the negative electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0052] <Negative electrode active material layer> The negative electrode active material layer contains at least a negative electrode active material, and may further contain, optionally, a conductive additive, a binder, a solid electrolyte, and the like. The negative electrode active material layer may also contain various other additives. The contents of the negative electrode active material, solid electrolyte, conductive additive, binder, and the like in the negative electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire negative electrode active material layer (total solid content) is taken as 100 mass%, the content of the negative electrode active material may be 40 mass% or more, 50 mass% or more, or 60 mass% or more, or may be 100 mass% or less, or 90 mass% or less.

[0053] (Negative electrode active material) As the negative electrode active material, various materials can be used that have a potential (charge / discharge potential) at which they absorb and release lithium ions that is lower than that of the positive electrode active material. The material for the negative electrode active material is not particularly limited, and may be metallic lithium or a material capable of absorbing and releasing metal ions such as lithium ions. Examples of materials capable of absorbing and releasing metal ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, and lithium titanate (Li4Ti5O 12 ) and the like can be mentioned, but are not limited to these.

[0054] The alloy-based negative electrode active material is not particularly limited, and examples thereof include Si alloy-based negative electrode active materials and Sn alloy-based negative electrode active materials. Examples of Si alloy-based negative electrode active materials include silicon, silicon oxide, silicon carbide, silicon nitride, and solid solutions thereof. The Si alloy-based negative electrode active material may contain metal elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, and Ti. Examples of Sn alloy-based negative electrode active materials include tin, tin oxide, tin nitride, and solid solutions thereof. The Sn alloy-based negative electrode active material may contain metal elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, and Si.

[0055] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0056] The shape of the negative electrode active material is not particularly limited, and may be any shape commonly used for negative electrode active materials in solid-state batteries. The negative electrode active material may be, for example, in the form of particles or a sheet.

[0057] (solid electrolyte) The material of the solid electrolyte is not particularly limited, and may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a polymer electrolyte.

[0058] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, and argyrodite-type solid electrolytes. Specific examples of sulfide solid electrolytes include Li2S-P2S5-based (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2(Li 13 GeP3S 16 , Li 10 GeP2S 12 ), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x PS6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0059] An example of an oxide solid electrolyte is Li7La3Zr2O 12 , Li 7-x La3Zr 1-x Nb x O 12 , Li 7-3x La3Zr2Al x O 12 , Li 3x La 2 / 3-x TiO3, Li 1+x Al x Ti 2-x (PO4)3, Li 1+x Al x Ge 2-x (PO4)3, Li3PO4, or Li 3+x PO 4-x N x (LiPON), etc.; or combinations thereof.

[0060] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0061] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0062] (Conductive additive) The conductive additive is not particularly limited. The conductive additive may be, for example, vapor grown carbon fiber (VGCF), acetylene black (AB), ketjen black (KB), carbon nanotube (CNT), carbon nanofiber (CNF), etc., but is not limited thereto. The conductive additive may be, for example, particulate or fibrous, and its size is not particularly limited. The conductive additive is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0063] (binder) The binder is not particularly limited. The binder may be, for example, polyvinylidene fluoride (PVdF), butadiene rubber (BR), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), or other materials, but is not limited to these. The binder is not particularly limited, and one type may be used alone, or two or more types may be used in combination.

[0064] The shape of the negative electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like negative electrode active material layer. The thickness of the negative electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0065] The negative electrode active material layer can be produced by applying a known method. For example, the negative electrode active material layer can be easily formed by dry or wet molding a negative electrode composite containing the above-mentioned various components. The negative electrode active material layer may be formed together with the negative electrode current collector layer or may be formed separately from the negative electrode current collector layer.

[0066] <Solid electrolyte layer> The solid electrolyte layer contains at least a solid electrolyte, and may contain a conductive aid, a binder, and the like as needed.

[0067] For the solid electrolyte, the conductive additive, and the binder, reference can be made to the above description of "<Negative electrode active material layer>".

[0068] The thickness of the solid electrolyte layer is not particularly limited, but may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0069] The solid electrolyte layer can be easily formed, for example, by dry or wet molding a solid electrolyte mixture containing the above-mentioned solid electrolyte and a binder.

[0070] <Cathode active material layer> The positive electrode active material layer contains at least a positive electrode active material, and may further contain, optionally, a solid electrolyte, a conductive additive, a binder, etc. The positive electrode active material layer may also contain various other additives. The contents of the positive electrode active material, solid electrolyte, conductive additive, binder, etc. in the positive electrode active material layer may be appropriately determined depending on the desired battery performance. For example, when the entire positive electrode active material layer (total solid content) is taken as 100 mass%, the content of the positive electrode active material may be 40 mass% or more, 50 mass% or more, 60 mass% or more, or 100 mass% or less, or 90 mass% or less.

[0071] (Cathode active material) The material of the positive electrode active material is not particularly limited as long as it can absorb and release lithium ions. Examples of the positive electrode active material include lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganese oxide (LiMnO), and nickel-cobalt-manganese oxide (NCM:LiCO 1 / 3 Ni 1 / 3 Mn 1 / 3 O2), lithium nickel-cobalt-aluminate (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y The material may be, but is not limited to, a different element-substituted Li-Mn spinel having a composition represented by O4 (M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn).

[0072] The positive electrode active material may have a coating layer, although it is not particularly limited. The coating layer is a layer containing a substance that has lithium ion conductivity, low reactivity with the positive electrode active material and the solid electrolyte, and can maintain the shape of the coating layer without flowing even when in contact with the active material and the solid electrolyte. Specific examples of materials that constitute the coating layer include LiNbO3 and Li4Ti5O 12 , Li3PO4, etc., but are not limited to these.

[0073] The shape of the positive electrode active material is not particularly limited as long as it is a general shape for a positive electrode active material of a solid-state battery. The positive electrode active material may be, for example, in the form of particles. The positive electrode active material may be in the form of primary particles or secondary particles formed by agglomeration of a plurality of primary particles. The average particle diameter D of the positive electrode active material 50 The average particle size D may be, for example, 1 nm or more, 5 nm or more, or 10 nm or more, and may be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. 50 is the particle size (median size) at 50% cumulative value in the volume-based particle size distribution determined by laser diffraction / scattering method.

[0074] For the solid electrolyte, conductive additive, and binder that can be contained in the positive electrode active material layer, reference can be made to the above description of "<Negative electrode active material layer>".

[0075] The shape of the positive electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like positive electrode active material layer. The thickness of the positive electrode active material layer is not particularly limited, and may be, for example, 0.1 μm or more, 1 μm or more, or 10 μm or more, and may be 2 mm or less, 1 mm or less, or 500 μm or less.

[0076] The positive electrode active material layer can be produced by applying a known method. For example, the positive electrode active material layer can be easily formed by dry or wet molding a positive electrode composite containing the above-mentioned various components. The positive electrode active material layer may be formed together with the positive electrode current collector layer or may be formed separately from the positive electrode current collector layer.

[0077] <Positive electrode current collector layer> The material used for the positive electrode current collector layer is not particularly limited, and any material commonly used for positive electrode current collectors in solid-state batteries can be appropriately used. Examples of materials used for the positive electrode current collector layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The positive electrode current collector layer may have a coating layer on its surface for purposes such as adjusting resistance. The positive electrode current collector layer may also be a metal foil or a substrate on which the above metals are plated or vapor-deposited.

[0078] The shape of the positive electrode current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Among these, foil is preferred.

[0079] The thickness of the positive electrode current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, and may be 1 mm or less, or 100 μm or less.

[0080] <Collector terminal> The current collector terminal may be electrically connected to, for example, a negative electrode current collector layer or a current collector foil serving as a positive electrode current collector layer. The current collector terminal may also be electrically connected to a negative electrode current collector tab connected to the negative electrode current collector layer or a positive electrode current collector tab connected to the positive electrode current collector layer. The material of the current collector terminal is not particularly limited, but metals such as aluminum and stainless steel (SUS) can be used.

[0081] <Laminating film> The laminate film has a fusion layer and a metal layer. The laminate film is not particularly limited, but may have a fusion layer, a metal layer, and a resin layer in this order.

[0082] (fusion layer) The material of the fusion layer is not particularly limited, but may be polyolefin resin, etc. Examples of polyolefin resins include, but are not limited to, polypropylene (PP) and polyethylene (PE). The thickness of the fusion layer is not particularly limited, but may be 30 μm or more, 40 μm or more, or 50 μm or more, or 110 μm or less, 100 μm or less, or 90 μm or less.

[0083] (metal layer) Examples of materials for the metal layer include, but are not limited to, aluminum, aluminum alloys, stainless steel, etc. The thickness of the metal layer is not particularly limited, but may be 20 μm or more, 30 μm or more, or 40 μm or more, or 70 μm or less, 60 μm or less, or 50 μm or less.

[0084] (resin layer) Examples of materials for the resin layer include, but are not limited to, polyethylene terephthalate, nylon, etc. The thickness of the resin layer is not particularly limited, but may be 70 μm or more, 80 μm or more, or 90 μm or more, or 270 μm or less, 250 μm or less, or 230 μm or less.

[0085] While embodiments of the electrode stacks and solid-state batteries of the present disclosure have been described, those skilled in the art will recognize that modifications are possible without departing from the scope of the claims. [Explanation of symbols]

[0086] 10 solid state battery 100 Electrode laminate 110 stacked battery unit 110a first end 110b second end 111 Negative electrode current collector layer 111a negative electrode laminated connection part 111b: extending side surface of negative electrode laminated connection part 111c: A negative electrode current collector layer on a surface facing the extending side surface of the negative electrode laminated connection portion 112 Negative electrode active material layer 113 Solid electrolyte layer 114 Cathode active material layer 115 Positive electrode current collector layer 115a Positive electrode laminated connection part 115b: extending side surface of positive electrode laminated connection portion 115c: A positive electrode current collector layer on a surface facing the extending side surface of the positive electrode laminated connection portion 120 unit batteries 200 Current collector terminal 300 Laminating Film

Claims

1. An electrode stack having a plurality of stacked battery units, each of the plurality of stacked battery units includes at least an anode current collector layer, an anode active material layer, a solid electrolyte layer, a cathode active material layer, and a cathode current collector layer in this order; (i) the negative electrode current collector layer extends from a first end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the first ends being inclined, and / or (ii) the positive electrode current collector layer extends from a second end of the stacked battery unit, and the plurality of stacked battery units are stacked on one another with the second ends being inclined, Electrode stack.

2. The electrode stack according to claim 1 , wherein the plurality of stacked battery units have the same shape.

3. Satisfying the above (i) and (ii), and the first end and the second end are opposite ends of the stacked battery unit; The electrode stack according to claim 1 .

4. The electrode stack according to any one of claims 1 to 3, current collecting terminals, and a laminate film sealing the electrode stack together with the current collecting terminals; A solid-state battery having: (a) the negative electrode current collector layers or negative electrode current collector tabs connected to the negative electrode current collector layers of the plurality of stacked battery units are joined together to form a negative electrode stack connection portion, and the negative electrode current collector layers and / or the negative electrode current collector tabs are curved, and the negative electrode stack connection portion is connected, at an extending side surface of the negative electrode stack connection portion, to an end surface of the current collector terminal that faces the first end portion of the electrode stack, and the extending side surface of the negative electrode stack connection portion is a surface of the negative electrode stack connection portion from which the plurality of first end portions that are arranged at an angle extend; and / or (b) the positive electrode current collector layers or positive electrode current collector tabs connected to the positive electrode current collector layers of the plurality of stacked battery units are collected together to form a positive electrode stack connection portion, and the positive electrode current collector layers and / or the positive electrode current collector tabs are curved, and the positive electrode stack connection portion is connected, at an extending side surface of the positive electrode stack connection portion, to an end surface of the current collector terminal that faces the second end portion of the electrode stack, and the extending side surface of the negative electrode stack connection portion is a surface of the negative electrode stack connection portion from which the plurality of second end portions that are arranged at an angle extend. solid state battery.

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