Battery

Abstract

To provide a battery capable of improving volumetric efficiency.SOLUTION: The battery has an electrode laminate 100 in which a first current collector layer 110, a first electrode active material layer 120, an electrolyte layer 130, and a second electrode active material layer 140 are laminated in this order. In at least one end of the electrode laminate 100, an end surface 120a of the first electrode active material layer, an end surface 130a of the electrolyte layer, and an end surface 140a of the second electrode active material layer form a flush surface 100a, and the angle 100b formed by the flush surface 100a and a surface of the first current collector layer 110 is less than 90°.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] A battery generally has an electrode laminate in which a positive electrode active material layer, an electrolyte layer, and a negative electrode active material layer are stacked. In this electrode laminate, if the positive electrode active material layer and the negative electrode active material layer come into contact with each other, a short circuit occurs. Therefore, the following laminates for all-solid-state batteries and all-solid-state batteries are known in which the contact between the positive electrode active material layer and the negative electrode active material layer is suppressed.

[0003] Patent Document 1 discloses a laminate for an all-solid-state battery in which a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer are laminated in this order, and at least a part of the edge of the laminate is chamfered. According to the laminate for an all-solid-state battery in Patent Document 1, it is possible to provide a laminate for an all-solid-state battery in which the risk of short-circuiting between the positive electrode active material layer and the negative electrode active material layer is reduced.

[0004] Patent Document 2 discloses an all-solid-state battery in which a positive electrode active material layer is laminated on one side of a solid electrolyte layer and a negative electrode active material layer is laminated on the other side, and the solid electrolyte layer protrudes from the positive electrode active material layer and the negative electrode active material layer by 50 μm to 1000 μm in a direction intersecting the lamination direction. According to the all-solid-state battery in Patent Document 2, even if the positive electrode active material layer or the negative electrode active material layer expands during charge and discharge, the positive electrode active material layer and the negative electrode active material layer are unlikely to come into contact with each other. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-050153 [Patent Document 2] Patent Publication No. 2021-106101 Summary of the Invention [Problem to be solved by the invention]

[0006] In order to suppress short circuits, in addition to Patent Documents 1 and 2, it is also conceivable to form each layer inside the sagging portion of each layer, taking into consideration the portion at the end of the electrode laminate where the composite slurry coating film spreads before drying, that is, the sagging portion. However, in a battery having such an electrode laminate, the sagging portions of each layer of the electrode laminate have a multi-stage configuration, which reduces the volumetric efficiency of the battery.

[0007] Therefore, an object of the present disclosure is to provide a battery that can improve volumetric efficiency. [Means for solving the problem]

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

[0009] <Aspect 1> an electrode laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; At least one end of the electrode stack, an end face of the first electrode active material layer, an end face of the electrolyte layer, and an end face of the second electrode active material layer form a flush surface; and the angle formed between the flush surface and the surface of the first current collector layer is less than 90°; battery. <Aspect 2> The battery according to aspect 1, wherein the angle formed between the flush surface and the surface of the first current collector layer is 20° to 70°. <Aspect 3> 3. The battery of claim 1, wherein the first current collector layer extends beyond a tip of the first electrode active material layer at at least one end of the electrode stack. <Aspect 4> The battery of any one of aspects 1 to 3, wherein the first current collector layer is a negative electrode current collector layer. <Aspect 5> A method for producing the battery according to any one of aspects 1 to 4, comprising the steps of: providing a preliminary laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; The preliminary laminate is cut obliquely from the surface of the second electrode active material layer to produce the electrode laminate. [Effects of the Invention]

[0010] According to the battery of the present disclosure, volumetric efficiency can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram illustrating a battery according to the present disclosure. [Figure 2] FIG. 2 is a schematic diagram illustrating a battery according to the prior art. [Figure 3] FIG. 3 is a schematic diagram for explaining the method for manufacturing a battery according to the present disclosure. 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] In the present disclosure, the battery may be a liquid-based battery containing an electrolytic solution as the electrolyte layer, or a solid-state battery having a solid electrolyte layer as the electrolyte layer. In the present disclosure, a "solid-state battery" refers to a battery that uses at least a solid electrolyte as the electrolyte, and therefore a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as the electrolyte. In the present disclosure, the battery may also be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as the electrolyte.

[0014] "battery" The battery of the present disclosure comprises: an electrode laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; At least one end of the electrode stack, an end face of the first electrode active material layer, an end face of the electrolyte layer, and an end face of the second electrode active material layer form a flush surface; and The angle formed between the flush surface and the surface of the first current collector layer is less than 90°.

[0015] According to the battery of the present disclosure, volumetric efficiency can be improved.

[0016] Without being limited by theory, at least one end of the electrode stack, the end face of the first electrode active material layer, the end face of the electrolyte layer, and the end face of the second electrode active material layer form a flush surface, so that so-called sagging portions are substantially absent, thereby improving volumetric efficiency.

[0017] Furthermore, by making the angle between the flush surface and the surface of the first current collector layer less than 90°, the area of ​​the first electrode active material layer can be made larger than the area of ​​the second electrode active material layer, which may ensure the battery capacity of the first electrode active material layer.

[0018] FIG. 1 is a schematic diagram showing one embodiment of the battery of the present disclosure, but is not limited to this embodiment.

[0019] FIG. 1A is a cross-sectional schematic diagram of the periphery of one end of an electrode laminate 100 included in a battery 10, and FIG. 1B is a schematic diagram of the periphery of one end of the electrode laminate 100 included in the battery 10, viewed from the surface side of the second electrode active material layer. The battery 10 illustrated in FIGS. 1A and 1B has an electrode laminate 100 in which a first current collector layer 110, a first electrode active material layer 120, an electrolyte layer 130, and a second electrode active material layer 140 are stacked in this order. At one end of the electrode laminate 100, the end surface 120a of the first electrode active material layer, the end surface 130a of the electrolyte layer, and the end surface 140a of the second electrode active material layer form a flush surface 100a. Therefore, the electrode laminate 100 of the battery 10 is substantially free of so-called sagging portions, thereby improving the volumetric efficiency of the battery 10. Furthermore, the angle 100b formed between the flush surface 100a and the surface of the first current collector layer 110 is less than 90°, so that the area of ​​the first electrode active material layer can be made larger than the area of ​​the second electrode active material layer, thereby ensuring the battery capacity of the first electrode active material layer.

[0020] FIG. 2 is a cross-sectional schematic diagram showing one embodiment of a battery in the prior art, but is not limited to this case.

[0021] The conventional battery shown in FIG. 2 is obtained by sequentially coating and drying an electrode composite slurry and a solid electrolyte composite slurry to form an electrode stack, and each layer has a sagging portion. Specifically, the battery 10 shown in FIG. 2 has an electrode stack 100 in which a first current collector layer 110, a first electrode active material layer 120, an electrolyte layer 130, and a second electrode active material layer 140 are stacked in this order. The end surface 120a of the first electrode active material layer forms an inclined surface that approaches the first current collector layer 110 as it approaches the tip 120b of the first electrode active material layer. The end surface 130a of the electrolyte layer and the end surface 140a of the second electrode active material layer also form inclined surfaces similar to the end surface 120a of the first electrode active material layer. Each inclined surface is formed in a stepped shape, forming a so-called sagging portion (the area enclosed by a dotted line in FIG. 2). The presence of this sagging portion reduces the volumetric efficiency of the battery.

[0022] In the battery of the present disclosure, the flush surface is not particularly limited, but may be a cut or cut surface.

[0023] 1A and 1B, the end surface 120a of the first electrode active material layer, the end surface 130a of the electrolyte layer, and the end surface 140a of the second electrode active material layer form a flush surface 100a, which may be a cut or milled surface. A battery having the flush surface 100a as a cut or milled surface can be obtained, for example, by removing sagging portions of the electrode active material layer, etc., at the end of the electrode stack by cutting or milling the surface of the second electrode active material layer. By forming the flush surface as a cut or milled surface, for example, the ends of each layer can be processed simultaneously after stacking the layers, allowing batteries to be obtained with high productivity.

[0024] In the battery of the present disclosure, the angle between the flush plane and the surface of the first current collector layer is preferably less than 90° and 20° to 70°. The angle is not particularly limited, but may be 10° or more, 20° or more, 30° or more, 40° or more, 50° or more, 60° or more, 70° or more, or 80° or more, or may be less than 90°, 85° or less, 80° or less, 75° or less, 70° or less, 65° or less, or 60° or less.

[0025] 1A and 1B, the angle 100b formed between the flush surface and the surface of the first current collector layer will be described. The cross-sectional schematic diagram of the battery in FIG. 1A is a cross-section perpendicular to the surface direction of the first current collector layer and perpendicular to the line formed by the tip 120b of the first electrode active material layer, specifically, a cross-section taken at the cutting position shown by the dashed dotted line in FIG. 1B. The angle 100b is the angle formed between the flush surface 100a and the surface of the first current collector layer 110 in the cross-section shown in FIG. 1A. The angle 100b is less than 90° and preferably 20 to 70°.

[0026] In the battery of the present disclosure, at least one end of the electrode laminate, the first current collector layer preferably extends beyond the tip of the first electrode active material layer, although this is not particularly limited.

[0027] 1A and 1B, the electrode laminate 100 includes a first current collector layer 110, a first electrode active material layer 120, an electrolyte layer 130, and a second electrode active material layer 140 laminated in this order. The first current collector layer 110 extends beyond the tip 120b of the first electrode active material layer.

[0028] <Battery manufacturing method> The battery of the present disclosure can be manufactured by a method comprising the following steps: providing a preliminary laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; The preliminary laminate is cut obliquely from the surface of the second electrode active material layer to produce the electrode laminate.

[0029] According to the battery manufacturing method of the present disclosure, a battery with improved volumetric efficiency can be manufactured.

[0030] FIG. 3 is a schematic diagram showing one embodiment of the method for producing a battery according to the present disclosure, but the method is not limited to this embodiment.

[0031] In the method for manufacturing a battery according to the present disclosure, first, as shown in Fig. 3A, a preliminary laminate 101 is provided in which a first current collector layer 110, a first electrode active material layer 120, an electrolyte layer 130, and a second electrode active material layer 140 are laminated in this order. Next, as shown in Fig. 3B, the preliminary laminate 101 is cut obliquely from the surface of the second electrode active material layer 140 using, for example, a cutting blade 200 to produce the electrode laminate 100. In this way, by cutting and removing so-called sagging portions of the electrode active material layers and the like obliquely, a battery with improved volumetric efficiency can be manufactured.

[0032] <Method of Cutting Pre-Laminate> The method for cutting the pre-laminate is not particularly limited, but may be cutting using a cutting blade or laser, or may be cutting by liquid jet processing such as water jet processing.

[0033] <Battery and Battery Manufacturing Method; Each Configuration> Each component of the battery and the method for manufacturing the battery will be described below.

[0034] 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 an electrode active material layer, etc.

[0035] In the battery of the present disclosure, the electrode stack has a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer.

[0036] <First current collector layer> The first current collector layer is not particularly limited, but may be a positive electrode current collector layer or a negative electrode current collector layer. In the battery of the present disclosure, the first current collector layer is not particularly limited, but is preferably a negative electrode current collector layer.

[0037] The material used for the first current collector layer is not particularly limited, and any material commonly used for battery current collectors can be appropriately used. Examples of materials used for the first 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 first current collector layer may have a coating layer on its surface for purposes such as adjusting resistance.

[0038] The shape of the first current collector layer is not particularly limited, but examples thereof include foil, plate, mesh, etc. Of these, foil is preferred.

[0039] The thickness of the first 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.

[0040] <First electrode active material layer> The first electrode active material layer contains at least an electrode active material, and may further contain, optionally, a solid electrolyte, a conductive additive, a binder, and the like.

[0041] The first electrode active material layer is not particularly limited, but may be a positive electrode active material layer or a negative electrode active material layer. In the battery of the present disclosure, the first electrode active material layer is not particularly limited, but is preferably a negative electrode active material layer from the viewpoint of enabling the area of ​​the first electrode active material layer to be larger than the area of ​​the second electrode active material layer.

[0042] When the first electrode active material layer is a positive electrode active material layer, the first electrode active material layer contains a positive electrode active material as the electrode active material, and when the first electrode active material layer is a negative electrode active material layer, the first electrode active material layer contains a negative electrode active material as the electrode active material.

[0043] (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), etc., but are not limited to these.

[0044] 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.

[0045] 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 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.

[0046] (Negative electrode active material) As the negative electrode active material, various materials can be used that have a potential (charge / discharge potential) at which lithium ions are absorbed and released that is lower than that of the positive electrode active material. The material of 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.

[0047] 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, but are not limited to, silicon, silicon oxide, silicon carbide, silicon nitride, and solid solutions thereof. The Si alloy-based negative electrode active material can also include metal elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, Ti, etc. The Sn alloy-based negative electrode active material can also include, but is not limited to, tin, tin oxide, tin nitride, and solid solutions thereof. The Sn alloy-based negative electrode active material can also include metal elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, etc.

[0048] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0049] 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 batteries. The negative electrode active material may be, for example, in the form of particles or a sheet.

[0050] (solid electrolyte) The material of the solid electrolyte is not particularly limited, but may be a sulfide solid electrolyte, an oxide solid electrolyte, a polymer electrolyte, or the like.

[0051] 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 PS 6-x Cl x etc.; or combinations thereof, but are not limited to these.

[0052] 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.

[0053] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0054] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0055] (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.

[0056] (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.

[0057] The shape of the first electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like first electrode active material layer. The thickness of the first 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.

[0058] The first electrode active material layer can be produced by applying a known method, for example, by dry or wet molding an electrode mixture containing the above-mentioned various components to form the first electrode active material layer.

[0059] <Electrolyte layer - solid electrolyte layer> The battery of the present disclosure can be a solid-state battery, i.e., have a solid electrolyte layer as the electrolyte layer. The solid electrolyte layer contains at least a solid electrolyte and may contain a conductive additive, a binder, and the like as needed. For the solid electrolyte, the conductive additive, and the binder, please refer to the description above in "<First electrode active material layer>".

[0060] 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.

[0061] 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.

[0062] <Electrolyte layer-electrolyte> The battery of the present disclosure can be a liquid battery, i.e., have an electrolyte solution as the electrolyte layer, particularly an electrolyte solution held in a separator layer.

[0063] (electrolyte) The electrolyte is not particularly limited, but preferably contains a supporting salt and a solvent.

[0064] The supporting salt (lithium salt) of the electrolyte solution having lithium ion conductivity is not particularly limited, but examples thereof include inorganic lithium salts and organic lithium salts. Examples of inorganic lithium salts include, but are not limited to, LiPF, LiBF, LiClO, and LiAsF. Examples of organic lithium salts include, but are not limited to, LiCF, SO, LiN(CF, SO), LiN(CF, SO), LiN(FSO), LiC(CF, SO), and LiC(CF, SO).

[0065] The solvent used in the electrolyte solution is not particularly limited, but examples thereof include cyclic carbonates, chain carbonates, etc. Examples of cyclic carbonates include, but are not limited to, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), etc. Examples of chain carbonates include, but are not limited to, dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. The electrolyte solution is not particularly limited, but one type may be used alone, or two or more types may be used in combination.

[0066] (separator) The separator is not particularly limited, and any separator commonly used for batteries can be appropriately used, such as a polyolefin-based, polyamide-based, or polyimide-based nonwoven fabric.

[0067] <Second electrode active material layer> The second electrode active material layer contains at least an electrode active material, and may further contain, optionally, a solid electrolyte, a conductive additive, a binder, and the like.

[0068] The second electrode active material layer is not particularly limited, but may be a positive electrode active material layer or a negative electrode active material layer. In the battery of the present disclosure, the second electrode active material layer is not particularly limited, but is preferably a positive electrode active material layer, from the viewpoint of making the area of ​​the first electrode active material layer larger than the area of ​​the second electrode active material layer.

[0069] When the first electrode active material layer is a positive electrode active material layer, the second electrode active material layer contains a negative electrode active material as the electrode active material, and when the first electrode active material layer is a negative electrode active material layer, the second electrode active material layer contains a positive electrode active material as the electrode active material.

[0070] For the electrode active material, solid electrolyte, conductive additive, and binder that can be contained in the second electrode active material layer, the description above in "<First electrode active material layer>" can be referred to.

[0071] The shape of the second electrode active material layer is not particularly limited, and may be, for example, a substantially flat sheet-like second electrode active material layer. The thickness of the second 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.

[0072] The second electrode active material layer can be produced by applying a known method, for example, by dry or wet molding an electrode mixture containing the above-mentioned various components to form the second electrode active material layer.

[0073] <Battery uses, etc.> The battery in the present disclosure is not particularly limited, and may be a lithium-ion secondary battery. The battery in the present disclosure may be, for example, an in-vehicle battery, or may be used as a power source for a moving body other than a vehicle (for example, a train, a ship, or an airplane), or may be used as a power source for an electrical appliance such as an information processing device.

[0074] While embodiments of the disclosed batteries and methods for manufacturing batteries 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]

[0075] 10 batteries 100 Electrode laminate 100a entire surface 100b Angle between the plane and the surface of the first current collector layer 101 Pre-laminate 110 First current collector layer 120 First electrode active material layer 120a End surface of the first electrode active material layer 120b Tip of first electrode active material layer 130 Electrolyte layer 130a End surface of electrolyte layer 140 Second electrode active material layer 140a End surface of second electrode active material layer 200 cutting blade

Claims

1. an electrode laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; At least one end of the electrode stack, an end face of the first electrode active material layer, an end face of the electrolyte layer, and an end face of the second electrode active material layer form a flush surface; and the angle formed between the flush surface and the surface of the first current collector layer is less than 90°; battery.

2. 2. The battery according to claim 1, wherein the angle between the flush plane and the surface of the first current collector layer is 20° to 70°.

3. The battery according to claim 1 , wherein the first current collector layer extends beyond the tip of the first electrode active material layer at at least one end of the electrode stack.

4. 10. The battery of claim 1, wherein the first current collector layer is a negative electrode current collector layer.

5. A method for producing the battery according to any one of claims 1 to 4, comprising the steps of: providing a preliminary laminate in which a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer are laminated in this order; The preliminary laminate is cut obliquely from the surface of the second electrode active material layer to produce the electrode laminate.

Images