Battery

Abstract

To provide a battery that can improve the volumetric efficiency of a battery.SOLUTION: A battery includes a laminate 100 in which a negative electrode current collector layer 110, a negative electrode active material layer 120, an electrolyte layer 130, and a positive electrode active material layer 140 are laminated in this order. At least one end of the laminate 100, a front end 120a of the negative electrode active material layer is located more inward than a front end 110a of the negative electrode current collector layer, a front end 130a of the electrolyte layer is located more inward than a front end 120a of the negative electrode active material layer, and a front end 140a of the positive electrode active material layer is located more inward than a front end 130a of the electrolyte layer, an insulating end member 200 is provided next to an end face 140b of the positive electrode active material layer, and the end face 130b of the electrolyte layer and the end face 120b of the negative electrode active material layer are covered by the insulating end member 200.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In battery manufacturing, an electrode active material layer is generally formed by coating a current collector with an electrode mixture slurry and drying the coated film. In such an electrode active material layer, the edges of the electrode mixture slurry coating film wet and spread before the electrode mixture slurry coating film dries, which can cause so-called sagging portions in the electrode active material layer. The following coating device is known to suppress the occurrence of sagging portions in the electrode active material layer.

[0003] Patent Document 1 discloses a coating device that includes a die that applies the coating liquid to a foil, with lip portions formed on both sides of a slit that ejects the coating liquid at one end, and the width direction of the lip portions is inclined with respect to the width direction of the foil.The coating device in Patent Document 1 is said to be able to suppress variations in basis weight in the coated area that occur due to sagging in a coating device that applies the coating liquid to a foil using a die. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-020098 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when manufacturing a battery in which an anode active material layer, an electrolyte layer, and a cathode active material layer are coated in this order on an anode current collector layer, the slurries for forming each layer must be coated taking into consideration the sagging portions of each layer in order to prevent short-circuiting of the battery, specifically, to prevent the cathode active material layer from contacting the anode current collector layer, the anode active material layer, and the electrolyte layer. In such a battery, the sagging portions have a multi-stage configuration, which reduces the volumetric efficiency of the battery.

[0006] Therefore, an object of the present disclosure is to provide a battery that can improve the volumetric efficiency of the battery. [Means for solving the problem]

[0007] The present disclosure achieves the above object by the following means.

[0008] <Aspect 1> a laminate in which a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer, and a positive electrode active material layer are laminated in this order; and At least one end of the laminate a tip of the negative electrode active material layer is located inside a tip of the negative electrode current collector layer, a front end of the electrolyte layer is located inside a front end of the negative electrode active material layer, a tip of the positive electrode active material layer is located inside a tip of the electrolyte layer, an insulating end member is provided in parallel with an end surface of the positive electrode active material layer; and an end surface of the electrolyte layer and an end surface of the negative electrode active material layer are covered with the insulating end member; battery. <Aspect 2> 2. The battery according to aspect 1, wherein the end face of the negative electrode active material layer forms an inclined surface that approaches the negative electrode current collector layer as it approaches the tip of the negative electrode active material layer. <Aspect 3> The battery according to aspect 1 or 2, wherein the angle between the tangential direction at the tip of the insulating end member and the plane direction of the surface of the negative electrode current collector layer is 45° to 90°. <Aspect 4> The battery according to any one of aspects 1 to 3, wherein the angle between the tangent direction at the tip of the positive electrode active material layer and the plane direction of the surface of the negative electrode current collector layer is 30° to 110°. <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 the negative electrode current collector layer, the negative electrode active material layer, and the electrolyte layer are laminated in this order; and The insulating edge member and the positive electrode active material layer are formed simultaneously on the pre-laminate, or the insulating edge member is formed and then the positive electrode active material layer is formed. [Effects of the Invention]

[0009] According to the battery of the present disclosure, the volumetric efficiency of the battery can be improved. [Brief explanation of the drawings]

[0010] [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 a tangent line. [Figure 4] FIG. 4 is a schematic diagram for explaining the method for manufacturing a battery according to the present disclosure. [Figure 5] FIG. 5 is a schematic diagram illustrating another embodiment of the method for producing a battery according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] 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.

[0013] "battery" The battery of the present disclosure comprises: a laminate in which a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer, and a positive electrode active material layer are laminated in this order; and At least one end of the laminate a tip of the negative electrode active material layer is located inside a tip of the negative electrode current collector layer, a front end of the electrolyte layer is located inside a front end of the negative electrode active material layer, a tip of the positive electrode active material layer is located inside a tip of the electrolyte layer, an insulating end member is provided in parallel with an end surface of the positive electrode active material layer; and The end face of the electrolyte layer and the end face of the negative electrode active material layer are covered with the insulating end member.

[0014] According to the battery of the present disclosure, the volumetric efficiency of the battery can be improved.

[0015] Without being limited by theory, in the present disclosure, by juxtaposing an insulating end member on the end face of the positive electrode active material layer, the occurrence of sagging portions of the positive electrode active material layer can be suppressed, the volume of the sagging portions of the positive electrode active material layer can be reduced, and thereby the volumetric efficiency of the battery can be improved. Note that in conventional technologies that do not use the insulating end member of the present disclosure, the angle between the tangent direction at the tip of the positive electrode active material layer and the plane direction of the surface of the negative electrode current collector layer is often less than 30° in the sagging portions of the positive electrode active material layer.

[0016] Fig. 1 is a schematic diagram showing one embodiment of a battery according to the present disclosure, but is not limited to this case, while Fig. 2 is a schematic diagram showing one embodiment of a battery according to the prior art.

[0017] FIG. 1 shows a cross-sectional schematic diagram of the vicinity of an end portion of a laminate in a battery according to the present disclosure. The laminate 100 included in a battery 10 according to the present disclosure is a laminate in which an anode current collector layer 110, an anode active material layer 120, an electrolyte layer 130, and a cathode active material layer 140 are stacked in this order. At the end portion of the laminate 100, the tip 120a of the anode active material layer is located inside the tip 110a of the anode current collector layer, the tip 130a of the electrolyte layer is located inside the tip 120a of the anode active material layer, and the tip 140a of the cathode active material layer is located inside the tip 130a of the electrolyte layer. Furthermore, an insulating end member 200 is provided next to the end face 140b of the cathode active material layer, and the end face 130b of the electrolyte layer and the end face 120b of the anode active material layer are covered by the insulating end member 200. The insulating end member 200 provided in parallel with the end face 140b of the positive electrode active material layer can suppress the occurrence of sagging portions in the positive electrode active material layer 140, thereby improving the volumetric efficiency of the battery.

[0018] FIG. 2 shows a cross-sectional schematic diagram of the edge of a laminate in a conventional battery. The conventional battery shown in FIG. 2 is obtained, for example, by applying a cathode composite slurry to the surface of an electrolyte layer and drying it to form a cathode active material layer. The cathode active material layer also has a sagging portion. Specifically, in FIG. 2, the laminate 100 is a laminate in which an anode current collector layer 110, an anode active material layer 120, an electrolyte layer 130, and a cathode active material layer 140 are stacked in this order, similar to the battery of the present disclosure. At the edge of the laminate 100, the tip 120a of the anode active material layer is located inside the tip 110a of the anode current collector layer, the tip 130a of the electrolyte layer is located inside the tip 120a of the anode active material layer, and the tip 140a of the cathode active material layer is located inside the tip 130a of the electrolyte layer. However, unlike the battery of the present disclosure, the end surface 140b of the positive electrode active material layer does not have the insulating end member 200, and the end surface 140b of the positive electrode active material layer forms an inclined surface that approaches the electrolyte layer 130 as it approaches the front end 140a of the positive electrode active material layer. Because the end surface of the positive electrode active material layer forms such an inclined surface (a so-called sagging portion), the volumetric efficiency of the battery is lower than that of the battery of the present disclosure.

[0019] The tip of the positive electrode active material layer is not particularly limited, but may be located 1.8 to 3.5 mm inward from the tip of the negative electrode active material layer, and is not particularly limited, but may be located 0 to 1.7 mm inward from the tip of the electrolyte layer.

[0020] In the battery of the present disclosure, the end face of the negative electrode active material layer may be, but is not particularly limited to, an inclined surface that approaches the negative electrode current collector layer toward the tip of the negative electrode active material layer, and similarly, the end face of the electrolyte layer may be, but is not particularly limited to, an inclined surface that approaches the negative electrode active material layer toward the tip of the electrolyte layer.

[0021] In FIG. 1 , the negative electrode active material layer 120 is formed on the negative electrode current collector layer 110, and the end surface 120b of the negative electrode active material layer forms an inclined surface that approaches the negative electrode current collector layer 110 as it approaches the front end 120a of the negative electrode active material layer. For example, when a negative electrode composite slurry is applied to the surface of the negative electrode current collector layer and dried to form a negative electrode active material layer, the end surface of the negative electrode active material layer may form an inclined surface as shown in FIG. 3. Regarding the inclined surface of the negative electrode active material layer, the angle between the tangent direction at the front end of the negative electrode active material layer and the plane direction of the surface of the negative electrode current collector layer is not particularly limited, but may be 0.8° or greater. The electrolyte layer 130 is formed on the negative electrode active material layer 120, and the end surface 130b of the electrolyte layer forms an inclined surface that approaches the negative electrode active material layer 120 as it approaches the front end 130a of the electrolyte layer. For example, when an electrolyte mixture slurry is applied to the surface of a negative electrode active material layer and dried to form an electrolyte layer, the end face of the electrolyte layer may form an inclined surface as shown in Fig. 3. An insulating end member 200 is provided in juxtaposition to the end face 140b of the positive electrode active material layer, and the end face 130b of the electrolyte layer and the end face 120b of the negative electrode active material layer are covered by the insulating end member 200. Even when the negative electrode active material layer or the electrolyte layer has an inclined surface, the insulating end member 200 provided in juxtaposition to the end face 140b of the positive electrode active material layer prevents sagging of the positive electrode active material layer 140, thereby improving the volumetric efficiency of the battery.

[0022] In the battery of the present disclosure, the angle between the tangential direction at the tip of the insulating end member and the plane direction of the surface of the negative electrode current collector layer is not particularly limited, but is preferably 45° to 90°. The angle between the tangential direction at the tip of the insulating end member and the plane direction of the surface of the negative electrode current collector layer may be, for example, 45° or more, 50° or more, 55° or more, 60° or more, 70° or more, or 75° or more, or may be 90° or less, 85° or less, or 80° or less.

[0023] 1, the end face 200b of the insulating end member forms an inclined surface that approaches the negative electrode current collector layer 110 as it approaches the tip 200a of the insulating end member. The tangential direction 200c at the tip of the insulating end member is the direction of a tangent at the tip 200a of the insulating end member to the end face 200b of the insulating end member. The angle 200d between the tangential direction at the tip of the insulating end member and the surface direction of the negative electrode current collector layer is not particularly limited from the viewpoint of covering the end face 130b of the electrolyte layer and the end face 120b of the negative electrode active material layer with the insulating end member 200, and from the viewpoint of the volumetric efficiency of the battery, but is preferably 45° to 90°.

[0024] In the battery according to the present disclosure, the angle between the tangential direction at the tip of the positive electrode active material layer and the in-plane direction of the surface of the negative electrode current collector layer is not particularly limited, but is preferably 30° to 110°. The angle between the tangential direction at the tip of the positive electrode active material layer and the in-plane direction of the surface of the negative electrode current collector layer may be, for example, 30° or more, 35° or more, 40° or more, 45° or more, 50° or more, 55° or more, 60° or more, 65° or more, 70° or more, 75° or more, 80° or more, 85° or more, or 90° or more, or may be 110° or less, 105° or less, 100° or less, 95° or less, or 90° or less.

[0025] 1, the tangential direction 140c at the tip of the positive electrode active material layer is the direction of the tangent line at the tip 140a of the positive electrode active material layer on the end face 140b of the positive electrode active material layer. From the viewpoint of suppressing sagging of the positive electrode active material layer, the angle 140d between the tangential direction at the tip of the positive electrode active material layer and the plane direction of the surface of the negative electrode current collector layer is not particularly limited, but is preferably 50 to 110°.

[0026] In the present disclosure, the term "tangent" refers to a tangent in a cross section perpendicular to the surface direction of each layer and perpendicular to a line formed by the tip of each layer. FIG. 3 is a schematic diagram for explaining the term "tangent," but the present disclosure is not limited to this case. FIG. 3B is a schematic diagram of FIG. 3A viewed from the surface side of the positive electrode active material layer. For example, the tangent 120c of the negative electrode active material layer shown by a dotted line in FIG. 3A is a tangent in a cross section perpendicular to the surface direction of the negative electrode active material layer 120 and perpendicular to a line formed by the tip 120a of the negative electrode active material layer, specifically, a cross section cut at the cutting position shown by the dashed-dotted line in FIG. 3B. The same applies to the tangents of other layers.

[0027] <Battery manufacturing method> The battery of the present disclosure can be manufactured by a method comprising the steps of: providing a preliminary laminate in which a negative electrode current collector layer, a negative electrode active material layer, and an electrolyte layer are laminated in this order; and On the pre-laminate, an insulating edge member and a positive electrode active material layer are simultaneously formed, or the insulating edge member is formed and then the positive electrode active material layer is formed.

[0028] According to the battery manufacturing method of the present disclosure, the occurrence of sagging portions in the positive electrode active material layer can be suppressed.

[0029] FIG. 4 is a schematic diagram showing one embodiment of the method for producing a battery of the present disclosure, but the present disclosure is not limited to this embodiment.

[0030] In the method for manufacturing a battery according to the present disclosure, first, a preliminary laminate 101 is provided, as shown in FIG. 4A. This preliminary laminate 101 is a laminate in which a negative electrode current collector layer 110, a negative electrode active material layer 120, and an electrolyte layer 130 are stacked in this order. At at least one end of the preliminary laminate 101, the leading end 120a of the negative electrode active material layer is located more inward than the leading end 110a of the negative electrode current collector layer, and the leading end 130a of the electrolyte layer is located more inward than the leading end 120a of the negative electrode active material layer. Next, as shown in FIG. 4B, an insulating end member 200 and a positive electrode active material layer 140 are simultaneously formed on the preliminary laminate 101. At this time, the insulating end member 200 is formed so as to cover the end face 130b of the electrolyte layer and the end face 120b of the negative electrode active material layer. The method for simultaneously forming the insulating end member 200 and the positive electrode active material layer 140 is not particularly limited, but may be such that a partition is provided inside the die head of a die coater, and the insulating end member paste and the positive electrode composite slurry, which will be described later, are simultaneously applied to form the insulating end member and the positive electrode active material layer. By simultaneously forming the insulating end member 200 and the positive electrode active material layer 140 in this manner, the insulating end member 200 is juxtaposed to the end surface 140b of the positive electrode active material layer, thereby preventing sagging of the positive electrode active material layer 140.

[0031] FIG. 5 is a schematic diagram showing one embodiment of the method for producing a battery of the present disclosure, but the method is not limited to this embodiment.

[0032] In another embodiment of the method for manufacturing a battery according to the present disclosure, a preliminary laminate 101 is first provided as shown in FIG. 5A. The preliminary laminate 101 is a laminate in which a negative electrode current collector layer 110, a negative electrode active material layer 120, and an electrolyte layer 130 are stacked in this order. At at least one end of the preliminary laminate 101, the leading end 120a of the negative electrode active material layer is located more inward than the leading end 110a of the negative electrode current collector layer, and the leading end 130a of the electrolyte layer is located more inward than the leading end 120a of the negative electrode active material layer. Next, as shown in FIG. 5B, an insulating end member 200 is formed so as to cover the end face 130b of the electrolyte layer and the end face 120b of the negative electrode active material layer. Thereafter, as shown in FIG. 5C, a positive electrode active material layer 140 is formed. By forming the insulating end member 200 in this manner and then forming the positive electrode active material layer 140, the insulating end member 200 blocks the spreading of the positive electrode active material layer, thereby suppressing the occurrence of sagging portions of the positive electrode active material layer 140.

[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 a positive 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.

[0035] <Laminate> In the battery of the present disclosure, the laminate includes an insulating end member, a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer, and a positive electrode active material layer. In the battery of the present disclosure, the laminate may further include, but is not limited to, a positive electrode current collector layer.

[0036] <Insulating end member> The material of the insulating end member is not particularly limited as long as it is an insulator, and examples of the material of the insulating end member include but are not limited to butadiene rubber (BR), styrene-butadiene rubber (SBR), acrylic-butadiene rubber (ABR), nitrile-butadiene rubber (NBR), polyimide, etc.

[0037] The insulating end member can be formed to cover the end faces of the electrolyte layer and the negative electrode active material layer, for example, by applying an insulating end member paste containing the insulating end member and a solvent, drying it, and removing the solvent.

[0038] The insulating end member paste is preferably, but not limited to, non-reactive with the positive electrode composite or positive electrode composite slurry. The viscosity of the insulating end member paste is also, but not limited to, preferably higher than that of the positive electrode composite or positive electrode composite slurry, and may be, for example, 1.0 Pa·s or more, 5.0 Pa·s or more, or 10 Pa·s or more, or 100 Pa·s or less, 50 Pa·s or less, or 30 Pa·s or less. The viscosity of the insulating end member paste can be measured at 23°C using an E-type viscometer.

[0039] <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 a negative electrode current collector in a battery 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 a carbon sheet. The negative electrode current collector layer may have a coating layer on its surface for the purpose of adjusting resistance, etc.

[0040] 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.

[0041] 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.

[0042] <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 solid electrolyte, a conductive additive, a binder, etc. 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, etc. 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.

[0043] (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 described below. 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.

[0044] 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.

[0045] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, graphite, and the like.

[0046] 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.

[0047] (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.

[0048] 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.

[0049] 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.

[0050] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0051] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0052] (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.

[0053] (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.

[0054] 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.

[0055] 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.

[0056] <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 an electrolyte layer. The solid electrolyte layer contains at least a solid electrolyte and may also contain a conductive additive, a binder, etc. as necessary.

[0057] For the solid electrolyte, the conductive additive, and the binder, reference can be made to the above description of "<Negative electrode active material layer>".

[0058] 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.

[0059] 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.

[0060] <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.

[0061] (electrolyte) The electrolyte is not particularly limited, but preferably contains a supporting salt and a solvent.

[0062] 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).

[0063] 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.

[0064] (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.

[0065] <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.

[0066] (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).

[0067] 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.

[0068] 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.

[0069] 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>".

[0070] 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.

[0071] 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.

[0072] <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 a battery positive electrode current collector can be appropriately adopted. 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.

[0073] 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.

[0074] 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.

[0075] 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]

[0076] 10 batteries 100 laminate 101 Pre-laminate 110 Negative electrode current collector layer 110a Tip of negative electrode current collector layer 120 Negative electrode active material layer 120a Tip of negative electrode active material layer 120b End surface of negative electrode active material layer 120c Tangent to the negative electrode active material layer 130 Electrolyte layer 130a Tip of electrolyte layer 130b End face of electrolyte layer 140 Cathode active material layer 140a Tip of positive electrode active material layer 140b End surface of positive electrode active material layer 140c Tangential direction at the tip of the positive electrode active material layer 140d Angle between the tangential direction at the tip of the positive electrode active material layer and the surface direction of the negative electrode current collector layer 200 Insulating end member 200a Tip of insulating end member 200b End surface of insulating end member 200c Tangential direction at the tip of the insulating end member 200d Angle between the tangential direction at the tip of the insulating end member and the surface direction of the negative electrode current collector layer

Claims

1. a laminate in which a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer, and a positive electrode active material layer are laminated in this order; and At least one end of the laminate a tip of the negative electrode active material layer is located inside a tip of the negative electrode current collector layer, a front end of the electrolyte layer is located inside a front end of the negative electrode active material layer, a tip of the positive electrode active material layer is located inside a tip of the electrolyte layer, an insulating end member is provided in parallel with an end surface of the positive electrode active material layer; and an end surface of the electrolyte layer and an end surface of the negative electrode active material layer are covered with the insulating end member; battery.

2. The battery according to claim 1 , wherein the end face of the negative electrode active material layer forms an inclined surface that approaches the negative electrode current collector layer as it approaches the tip of the negative electrode active material layer.

3. 2. The battery according to claim 1, wherein an angle between a tangential direction at the tip of the insulating end member and a plane direction of the surface of the negative electrode current collector layer is 45° to 90°.

4. 2. The battery according to claim 1, wherein an angle between a tangential direction at the tip of the positive electrode active material layer and a plane direction of the surface of the negative electrode current collector layer is 30° to 110°.

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 the negative electrode current collector layer, the negative electrode active material layer, and the electrolyte layer are laminated in this order; and The insulating edge member and the positive electrode active material layer are formed simultaneously on the pre-laminate, or the insulating edge member is formed and then the positive electrode active material layer is formed.

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