All-solid battery and method of manufacturing the same

Abstract

To provide an all-solid battery capable of suppressing reduction of a battery capacity while reducing a possibility of short-circuit even in a case where a plurality of electric cells is included, and a method of manufacturing the same.SOLUTION: An all-solid battery includes a laminate 20 of a plurality of lamination units 22. In each of the plurality of lamination units 22, one or more sets of a first electrode collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second electrode collector are laminated successively. The laminate 20 is formed by mutually laminating each of the plurality of lamination units 22 in at least one of a contact between the first electrode collectors and a contact between the second electrode collectors. An end 28 of each of the plurality of lamination units 22 includes a slope 24 with respect to a lamination face 26 of each of the plurality of lamination units 22, and the laminate 20 has a minimum projection area in a lamination direction of each of the plurality of lamination units 22. A method of manufacturing the same is provided.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an all-solid-state battery and a method for manufacturing the same. [Background technology]

[0002] Among lithium-ion batteries, all-solid-state batteries, which replace the liquid electrolyte with a solid electrolyte, are attracting attention because they are expected to further increase energy density by using a solid electrolyte instead of the conventional liquid electrolyte.

[0003] In an all-solid-state battery, a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector are stacked in this order. Therefore, deformation and / or partial loss of each of these layers can cause a short circuit between the positive electrode and the negative electrode. Various attempts have been made to prevent this.

[0004] For example, Patent Document 1 discloses a laminate 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 also discloses that at least a part of the edge of the laminate is chamfered.

[0005] Patent Document 2 discloses that a laminate is cut out from a sheet in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector are laminated in this order, and this is used as an all-solid-state battery. Patent Document 2 also discloses that when cutting out the laminate, the cut surface has an inclined surface with respect to the laminate surface. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-50153 [Patent Document 2] International Publication No. 2019 / 221010 Summary of the Invention [Problem to be solved by the invention]

[0007] The laminate disclosed in Patent Document 1 has its edges chamfered to prevent deformation and / or detachment of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer, thereby reducing the possibility of short circuits. However, there has been insufficient consideration given to short circuits when the all-solid-state battery includes multiple unit cells. Furthermore, the all-solid-state battery disclosed in Patent Document 2 reduces the possibility of short circuits even when the laminate includes multiple unit cells, but has the problem of reduced battery capacity.

[0008] The present disclosure aims to solve the above-mentioned problems and to provide an all-solid-state battery and a manufacturing method thereof that can reduce the possibility of short circuiting and suppress a decrease in battery capacity even when including a plurality of unit cells. In this specification, unless otherwise specified, a unit cell refers to a battery in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector are arranged (stacked) in this order as a set. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to achieve the above object and have completed the all-solid-state battery and the manufacturing method thereof according to the present disclosure. <Aspect 1> A laminate of a plurality of laminate units is provided, each of the plurality of laminate units includes one or more stacked sets of a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second electrode current collector, stacked in this order; the plurality of laminate units are stacked one on top of the other with the first electrode current collectors in contact with each other and / or the second electrode current collectors in contact with each other to form a laminate, The end portion of each of the plurality of laminate units has an inclined surface with respect to the laminate surface of each of the plurality of laminate units, and The laminate has a minimum projected area in the stacking direction of each of the plurality of laminate units. All-solid-state battery. <Aspect 2> Each of the plurality of laminate units includes a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, a second electrode current collector, a second electrode active material layer, a solid electrolyte layer, a first electrode active material layer, and a first electrode current collector laminated in this order. 2. The all-solid-state battery according to embodiment 1. <Aspect 3> A first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second electrode current collector are stacked in this order to obtain one or more stacked units; preparing a plurality of the laminate units, and stacking the laminate units one on top of another with at least one of the first electrode current collectors in contact with each other and the second electrode current collectors in contact with each other to form a laminate; Providing an inclined surface with respect to the lamination surface at the end of the laminate; adjusting the positions of the plurality of laminate units at contact surfaces of the plurality of laminate units so that the projected area of ​​the laminate in the stacking direction is minimized; A method for manufacturing an all-solid-state battery, comprising: <Aspect 4> A first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, a second electrode current collector, a second electrode active material layer, a solid electrolyte layer, a first electrode active material layer, and a first electrode current collector are arranged in this order to obtain a laminate unit. A method for producing the all-solid-state battery according to aspect 3. [Effects of the Invention]

[0010] According to the present disclosure, an all-solid-state battery can be provided in which the end portions of each of the plurality of stacked units have inclined surfaces with respect to the stacking surface, thereby reducing the possibility of short-circuiting, and the stack has a minimum projected area in the stacking direction, thereby suppressing a decrease in battery capacity.

[0011] Furthermore, according to the present disclosure, it is possible to provide a manufacturing method capable of obtaining a desired all-solid-state battery by providing an inclined surface with respect to the stacking surface at an end of the stack and adjusting the positions of each of the plurality of stack units at their contact surfaces so that the projected area of ​​the stack in the stacking direction is minimized. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing an example of a method for manufacturing an all-solid-state battery. [Figure 2] FIG. 2 is a cross-sectional view showing the structure of a laminate having an inclined surface. [Figure 3] FIG. 3 is a schematic cross-sectional view showing an example of a part of the laminate. [Figure 4] FIG. 4 is an enlarged schematic cross-sectional view of a region P indicated by a dotted line in FIG. [Figure 5] FIG. 5 is an enlarged schematic cross-sectional view of a region Q indicated by a dotted line in FIG. [Figure 6] FIG. 6 is a cross-sectional view showing another embodiment of the formation of a laminate. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the all-solid-state battery and the manufacturing method thereof according to the present disclosure will be described in detail. Note that the all-solid-state battery and the manufacturing method thereof according to the present disclosure are not limited to the embodiments described below.

[0014] Without being bound by theory, the inventors will explain, with reference to the drawings, the reason why the all-solid-state battery of the present disclosure can suppress a decrease in battery capacity while reducing the possibility of a short circuit, even when including a plurality of unit cells.

[0015] Fig. 1 is a cross-sectional view showing an example of a method for manufacturing an all-solid-state battery. Fig. 2 is a cross-sectional view showing a structure of a laminate having an inclined surface. Fig. 3 is a cross-sectional view showing an example of a portion of a laminate of an all-solid-state battery according to the present disclosure. Fig. 4 is a cross-sectional view showing an enlarged region P indicated by a dotted line in Fig. 3.

[0016] When an all-solid-state battery includes a plurality of unit cells, forming each layer into a desired shape and then laminating them requires a large number of steps, so the laminate 20 may be cut as shown in Fig. 1. The dashed line in Fig. 1 indicates the cut surface.

[0017] 2, the cut laminate 20 includes a plurality of stacked laminate units 22. When cutting the laminate 20, the end 28 of the laminate 20 is provided with an inclined surface, thereby reducing the possibility of short circuits. The reason for this will be described later.

[0018] Referring to FIG. 3, in the stack 20, all the stack units 22 overlap each other and the stack 20 effectively functions as a battery when “a ef In contrast, if the laminate 20 does not have an inclined surface, that is, if the laminate surface 26 and the end surface 24 are perpendicular, the area where all the laminate units 22 overlap is substantially within the range indicated by "a," and the battery capacity does not decrease.

[0019] 3, the positions of the laminate units 22 are adjusted so that the laminate 20 has the smallest projected area in the stacking direction of the laminate units 22. ef The range indicated by can be brought closer to the range indicated by a, thereby suppressing the decrease in battery capacity.

[0020] Such position adjustment is achieved by sliding each of the laminate units 22 relative to each other at the interfaces of the laminate units 22. Therefore, the electrode elements of the laminate units 22 are configured so that each of the laminate units 22 can be stacked with the first electrode current collectors in contact with each other and the second electrode current collectors in contact with each other.

[0021] The constituent elements of the all-solid-state battery and the manufacturing method thereof according to the present disclosure, which have been completed based on the findings and the like described above, will be described with reference to the drawings.

[0022] 《All-solid-state battery》 As shown in Fig. 3, the all-solid-state battery 100 of the present disclosure includes a plurality of laminate units 22. The plurality of laminate units 22 are stacked on one another to form a laminate 20. In addition to the laminate 20, the all-solid-state battery 100 also includes electrode tabs, an exterior body, and the like, which are not shown. The electrode tabs, the exterior body, and the like may be in well-known forms. The laminate unit 22 and the laminate 20 will be described below.

[0023] <Stacked unit> The end 28 of each of the multiple laminate units 22 has an inclined surface with respect to the stacking surface 26 of each of the multiple laminate units 22. "The end 28 of the laminate unit 22 has an inclined surface with respect to the stacking surface 26 of the laminate unit" means that the angle θ (0°<θ≦90°) between the stacking surface 26 and the end surface 24 is 0°<θ<90°, that is, θ is not 90° (not perpendicular).

[0024] Fig. 4 is an enlarged schematic cross-sectional view of region P indicated by the dotted line in Fig. 3. The boundary indicated by the dashed-dotted line in Fig. 4 corresponds to the boundary between the laminate unit 22 indicated by the reference symbol "22a" and the laminate unit 22 indicated by the reference symbol "22b" in region P indicated by the dotted line in Fig. 3.

[0025] Each laminate unit 22 has one or more sets of a first electrode current collector 40, a first electrode active material layer 50, a solid electrolyte layer 60, a second electrode active material layer 70, and a second electrode current collector 80 laminated in this order. Each set of the first electrode current collector 40, the first electrode active material layer 50, the solid electrolyte layer 60, the second electrode active material layer 70, and the second electrode current collector 80 constitutes a cell 30. In the embodiment shown in FIG. 4 , two sets of cells 30 are stacked in one laminate unit 22, but the present invention is not limited to this.

[0026] 4, the possibility of short-circuiting of the cell 30 is greatly affected by the short-circuit distance d. The longer the short-circuit distance d, the lower the possibility of short-circuiting of the cell 30.

[0027] The angle θ (0°<θ≦90°) between the stacking surface 36 and the end surface 34, the short-circuit distance d, and the thickness t of the solid electrolyte layer 60 have the relationship d=t / sinθ. As a result, when the end 38 of the cell 30 has an inclined surface with respect to the stacking surface 36, that is, when the end surface 34 is an inclined surface, 0°<θ<90°. <sinθ<1であることから、d> t, which reduces the possibility of a short circuit. Conversely, when the end 38 of the cell 30 does not have an inclined surface with respect to the stacking surface 36, that is, when the end face 34 of the end 38 of the cell 30 is perpendicular to the stacking surface 36, then θ=90°. Therefore, d=t / sin90°=t, which is unfavorable for a short circuit.

[0028] The angle θ may be appropriately determined within the range of 0°<θ<90°. From the viewpoint of sufficiently ensuring the short-circuit distance d described above, θ is preferably 60° or less, 55° or less, 50° or less, or 45° or less. From the viewpoint of preventing chipping, cracking, etc. of the end 38 of the cell 30, θ is preferably 20° or more, 25° or more, 30° or more, or 35° or more.

[0029] <Laminate> 3, the laminate 20 has the smallest projected area in the stacking direction of each of the multiple laminate units 22. This maximizes the area in which all of the laminate units 22 overlap in the laminate 20, thereby suppressing a decrease in battery capacity. "The laminate 20 has the smallest projected area in the stacking direction of each of the multiple laminate units 22" typically refers to the following aspect: That is, the multiple laminate units 22 are stacked one on top of another such that the center positions of each laminate unit 22 are aligned with each other in the plane direction of the laminate units 22, and the end faces 24 of the laminate units 22 are aligned with each other in the plane direction of the laminate units 22.

[0030] The first electrode current collector 40, the first electrode active material layer 50, the second electrode active material layer 70, and the second electrode current collector 80, which are components of the laminate 20, may be a positive electrode current collector, a positive electrode active material layer, a negative electrode active material layer, and a negative electrode current collector, respectively, or may be a negative electrode current collector, a negative electrode active material layer, a positive electrode active material layer, and a positive electrode current collector, respectively.

[0031] Next, the positive electrode current collector, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector will be described.

[0032] <Positive electrode current collector> The material used for the positive electrode current collector is not particularly limited, and any material that can be used as a positive electrode current collector for an all-solid-state battery can be appropriately adopted. Examples of materials used for the positive electrode current collector include, but are not limited to, stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, and conductive resins. The material used for the positive electrode current collector is preferably oxidation-resistant, and aluminum is preferred, for example.

[0033] <Cathode active material layer> The positive electrode active material layer contains a positive electrode active material, and optionally a solid electrolyte, a conductive additive, and a binder. When a solid electrolyte is contained, the solid electrolyte that constitutes the solid electrolyte layer can be used.

[0034] The material of the positive electrode active material is not particularly limited. For example, the positive electrode active material may be lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganese oxide (LiMnO), LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 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).

[0035] <Solid electrolyte layer> The material used for the solid electrolyte layer is not particularly limited, and any material that can be used as a separator layer in a battery can be appropriately used. The solid electrolyte layer may contain a solid electrolyte and, optionally, a binder.

[0036] The material of the solid electrolyte is not particularly limited, and examples thereof include a sulfide solid electrolyte, an oxide solid electrolyte, and a polymer electrolyte.

[0037] 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.

[0038] 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., but are not limited to these.

[0039] The sulfide solid electrolyte and the oxide solid electrolyte may be glass or crystallized glass (glass ceramic).

[0040] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0041] <Negative electrode active material layer> The negative electrode active material layer contains a negative electrode active material, and optionally a solid electrolyte, a conductive additive, and a binder. When a solid electrolyte is contained, the solid electrolyte that constitutes the solid electrolyte layer can be used.

[0042] 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, but are not limited to, alloy-based negative electrode active materials and carbon materials.

[0043] 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 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 elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, and Si. Among these, Si alloy-based negative electrode active materials are preferred.

[0044] The carbon material is not particularly limited, and examples thereof include hard carbon, soft carbon, and graphite.

[0045] <Negative electrode current collector> The material used for the negative electrode current collector is not particularly limited, and any material that can be used as a negative electrode current collector for an all-solid-state battery can be appropriately adopted. Examples of materials used for the negative electrode current collector include, but are not limited to, stainless steel (SUS), aluminum, copper, nickel, iron, titanium, carbon, and conductive resins. The material used for the negative electrode current collector is preferably reduction-resistant, and nickel is preferred, for example.

[0046] <Conductive additive> The conductive additive is not particularly limited, and may be, for example, a carbon material such as VGCF (Vapor Grown Carbon Fiber) or carbon nanofiber, or a metal material, but is not limited thereto.

[0047] <Binder> The binder is not particularly limited, and may be, for example, but not limited to, a material such as polyvinylidene fluoride (PVdF), butadiene rubber (BR), polytetrafluoroethylene (PTFE), or styrene butadiene rubber (SBR), or a combination thereof. 《Manufacturing method》 A method for manufacturing an all-solid-state battery according to the present disclosure (hereinafter, sometimes referred to as the "manufacturing method according to the present disclosure") will be described.

[0048] The manufacturing method of the present disclosure includes preparing a laminate unit, forming a laminate, providing an inclined surface, and adjusting a position. Each step will be described below.

[0049] <Providing stacked units> Fig. 5 is an enlarged schematic cross-sectional view of region Q indicated by a dotted line in Fig. 1. The boundary indicated by a dashed dotted line in Fig. 5 corresponds to the boundary between stacked units 22 indicated by reference numeral 22a and 22 indicated by reference numeral 22b in region Q indicated by a dotted line in Fig. 1.

[0050] In the manufacturing method of the present disclosure, first, an individual laminate unit 22 shown in FIG. 1 is provided. The laminate unit 22 is formed by laminating one or more sets of a first electrode current collector 40, a first electrode active material layer 50, a solid electrolyte layer 60, a second electrode active material layer 70, and a second electrode current collector 80 in this order. In the embodiment shown in FIG. 5, two sets are laminated, and two sets of unit cells 30 are stacked, but this is not limited to this. A commercially available product may be used for the laminate unit 22, or the laminate unit may be obtained by laminating one or more sets of a first electrode current collector 40, a first electrode active material layer 50, a solid electrolyte layer 60, a second electrode active material layer 70, and a second electrode current collector 80 in this order.

[0051] <Laminate formation> A plurality of laminate units 22 are prepared, and the laminate units 22 are stacked on top of each other with the first electrode current collectors 40 in contact with each other and the second electrode current collectors 80 in contact with each other to form the laminate 20. In the embodiment shown in Fig. 5, the laminate units 22 are stacked on top of each other with the first electrode current collectors 40 in contact with each other, but this is not limited to this. The second electrode current collectors 80 may be in contact with each other, or both the first electrode current collectors 40 and the second electrode current collectors 80 may be in contact with each other.

[0052] Fig. 6 is a cross-sectional schematic diagram showing another embodiment of laminate formation. In Fig. 6, first electrode current collectors 40 and second electrode current collectors 80 are stacked together so that they are in contact with each other. In the embodiment shown in Fig. 6, the area sandwiched between the dashed dotted line and the dashed two dotted line is one laminate unit 22.

[0053] <Providing an inclined surface> An inclined surface 24 is provided at an end 28 of the laminate 20 relative to the lamination surface 26. There are no particular limitations on the method for providing the inclined surface 24, but a typical method involves cutting and / or punching at an angle θ to the lamination surface 26, as shown by the dashed line in Fig. 1 .

[0054] <Position adjustment> The positions of the plurality of laminate units 22 are adjusted at the contact surfaces of the laminate units 22 so that the projected area of ​​the laminate 20 in the stacking direction is minimized. The positions of the individual laminate units 22 of the laminate 20 in the state shown in Fig. 2 are adjusted by moving them on the contact surfaces. The contact surfaces are the laminate surfaces of the laminate 20 other than the top and bottom surfaces.

[0055] The contact surface between the first electrode current collector 40 and the first electrode active material layer 50, the contact surface between the first electrode active material layer 50 and the solid electrolyte layer 60, the contact surface between the solid electrolyte layer 60 and the second electrode active material layer 70, and the contact surface between the second electrode active material layer 70 and the second electrode current collector 80 are fixed by a binder or the like contained in the first electrode active material layer 50, the solid electrolyte layer 60, and the second electrode active material layer 70. On the other hand, adjacent laminate units 22 are not fixed because the first electrode current collectors 40 and / or the second electrode current collectors 80 are in contact with each other, and therefore adjacent laminate units 22 can move relative to each other.

[0056] There are no particular limitations on the method for adjusting the position so that the projected area of ​​the laminate 20 in the stacking direction is minimized, but it is typically as follows: The positions of the laminate units 22 are adjusted so that the center positions of the laminate units 22 are aligned with each other in the plane direction of the laminate units 22, and the positions of the end faces of the laminate units 22 are aligned with each other in the plane direction of the laminate units 22.

[0057] Transformation In addition to what has been described so far, the all-solid-state battery and the manufacturing method thereof disclosed herein can be modified in various ways within the scope of the claims. For example, in the cutting process shown in FIG. 1, a plurality of laminates may be cut out to obtain a plurality of all-solid-state batteries. [Explanation of symbols]

[0058] 100 solid state battery 10 Laminated Precursor 14 Laminated Sheet 20 laminate 22 Stacking Unit 30 D cells 24 Slope 34 End face 26, 36 Laminated surface 28, 38 End 40 First electrode current collector 50 First electrode active material layer 60 Solid electrolyte layer 70 Second electrode active material layer 80 Second electrode current collector

Claims

1. The laminated body includes a plurality of laminated units, each of the plurality of laminate units includes one or more stacked sets of a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second electrode current collector, stacked in this order; the plurality of laminate units are stacked one on top of the other with the first electrode current collectors in contact with each other and / or the second electrode current collectors in contact with each other to form a laminate, The end portion of each of the plurality of laminate units has an inclined surface with respect to the laminate surface of each of the plurality of laminate units, and The laminate has a minimum projected area in the stacking direction of each of the plurality of laminate units. All-solid-state battery.

2. each of the plurality of laminate units includes a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, a second electrode current collector, a second electrode active material layer, a solid electrolyte layer, a first electrode active material layer, and a first electrode current collector laminated in this order; The all-solid-state battery according to claim 1 .

3. providing a laminate unit in which one or more sets of a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, and a second electrode current collector are laminated in this order; preparing a plurality of the laminate units, and stacking the laminate units one on top of another with at least one of the first electrode current collectors in contact with each other and the second electrode current collectors in contact with each other to form a laminate; Providing an inclined surface with respect to the lamination surface at the end of the laminate; adjusting the positions of the plurality of laminate units at contact surfaces of the plurality of laminate units so that the projected area of ​​the laminate in the stacking direction is minimized; A method for manufacturing an all-solid-state battery, comprising:

4. providing a laminate unit in which a first electrode current collector, a first electrode active material layer, a solid electrolyte layer, a second electrode active material layer, a second electrode current collector, a second electrode active material layer, a solid electrolyte layer, a first electrode active material layer, and a first electrode current collector are laminated in this order; The method for producing the all-solid-state battery according to claim 3 .

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