Manufacturing method of solid state battery

Abstract

To provide a manufacturing method of a solid state battery capable of reducing a resistance of the solid state battery and suppressing the occurrence of cracks in an electrode.SOLUTION: A manufacturing method of a solid state battery 1 includes: a first A step of obtaining an intermediate layer-negative electrode laminate by pressing in a state in which an intermediate layer 5 is disposed on a negative electrode 2; a second A step of obtaining a first solid electrolyte layer-intermediate layer-negative electrode laminate by pressing in a state in which a material constituting a first solid electrolyte layer 41 is disposed on a surface of the intermediate layer-negative electrode laminate on the side in which the intermediate layer 5 is disposed; a third step of obtaining a second solid electrolyte layer-positive electrode laminate by pressing in a state in which a material constituting a second solid electrolyte layer 43 is disposed on a positive electrode 3; and a fourth step (A) of obtaining an electrode laminate by pressing in a state in which a material constituting a gel electrolyte layer 42 is disposed between a surface of the first solid electrolyte layer-intermediate layer-negative electrode laminate on the side where the first solid electrolyte layer 41 is disposed and a surface of the second solid electrolyte layer-positive electrode laminate on the side where the second solid electrolyte layer 43 is disposed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a solid-state battery. [Background technology]

[0002] In recent years, research and development into solid-state batteries has been conducted to contribute to energy efficiency, ensuring more people have access to affordable, reliable, sustainable and advanced energy.

[0003] As a solid-state battery, an all-solid-state battery in which a solid electrolyte layer is disposed between a positive electrode and a negative electrode is known.

[0004] Patent Document 1 describes a method for manufacturing an all-solid-state battery in which a positive electrode laminate, an intermediate solid electrolyte layer, and a negative electrode laminate are stacked in this order. The positive electrode laminate includes a positive electrode current collector layer, a positive electrode active material layer, and a first solid electrolyte layer, in this order. The negative electrode laminate includes a second solid electrolyte layer, a negative electrode active material layer, and a copper-containing negative electrode current collector layer, in this order. The method for manufacturing an all-solid-state battery includes a first pressing step for pressing the positive electrode laminate, a second pressing step for pressing the negative electrode laminate, and a third pressing step for pressing the positive electrode laminate, the intermediate solid electrolyte layer, and the negative electrode laminate. The pressing pressure in the first pressing step is higher than the pressing pressure in the third pressing step, and the pressing temperature in the first pressing step is 150°C or higher and 175°C or lower. The pressing pressure in the second pressing step is higher than the pressing pressure in the third pressing step, and the pressing temperature in the second pressing step is 125°C or lower. Furthermore, the pressing temperature in the third pressing step is 125° C. or less, and the intermediate solid electrolyte layer is not pressed with a pressure exceeding the pressing pressure in the third pressing step before being pressed in the third pressing step. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-10816 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the manufacturing method of an all-solid-state battery described in Patent Document 1, if the pressing pressure in the first pressing step and the pressing pressure in the second pressing step are high, the first solid electrolyte layer and the second solid electrolyte layer become densified, and cracks occur in the electrodes when pressed in the third pressing step. On the other hand, if the pressing pressure in the first pressing step and the second pressing step are low, the first solid electrolyte layer and the second solid electrolyte layer do not become densified, and the resistance of the all-solid-state battery increases.

[0007] An object of the present invention is to provide a method for manufacturing a solid-state battery that can reduce the resistance of the solid-state battery and suppress the occurrence of cracks in the electrodes. [Means for solving the problem]

[0008] (1) A method for manufacturing a solid-state battery including an electrode laminate in which a negative electrode, an intermediate layer, an electrolyte layer, and a positive electrode are sequentially stacked, the electrolyte layer being a first solid electrolyte layer, a gel electrolyte layer, and a second solid electrolyte layer sequentially stacked in a stacking direction of the electrode laminate, the method comprising: Step 1A of placing a material for the intermediate layer on the negative electrode and pressing the laminate to obtain an intermediate layer-negative electrode laminate; Step 2A of placing a material for the first solid electrolyte layer on a surface of the intermediate layer-negative electrode laminate on which the intermediate layer is located and pressing the laminate to obtain a first solid electrolyte layer-intermediate layer-negative electrode laminate; Step 3 of placing a material for the second solid electrolyte layer on the positive electrode and pressing the laminate to obtain a second solid electrolyte layer-cathode laminate; and Step 4A of placing a material for the gel electrolyte layer between the surface of the first solid electrolyte layer-intermediate layer-negative electrode laminate on which the first solid electrolyte layer is located and the surface of the second solid electrolyte layer-cathode laminate on which the second solid electrolyte layer is located and pressing the laminate to obtain the electrode laminate.

[0009] (2) The method for producing a solid state battery according to (1), wherein the pressing pressure in the step 2A is higher than the pressing pressure in the step 4A.

[0010] (3) The method for producing a solid state battery according to (2), wherein the pressing pressure in the step 2A is 600 MPa or more and 1000 MPa or less.

[0011] (4) The method for producing a solid-state battery according to any one of (1) to (3), wherein the pressing pressure in the third step is higher than the pressing pressure in the fourth step.

[0012] (5) The method for producing a solid state battery according to (4), wherein the pressing pressure in the third step is 800 MPa or more and 1200 MPa or less.

[0013] (6) A method for manufacturing a solid-state battery including an electrode laminate in which a negative electrode, an electrolyte layer, and a positive electrode are sequentially stacked, the electrolyte layer being a first solid electrolyte layer, a gel electrolyte layer, and a second solid electrolyte layer sequentially stacked in a stacking direction of the electrode laminate, the method comprising: a 2B step of arranging a material for the first solid electrolyte layer on the negative electrode and pressing the laminate to obtain a first solid electrolyte layer-negative electrode laminate; a 3B step of arranging a material for the second solid electrolyte layer on the positive electrode and pressing the laminate to obtain a second solid electrolyte layer-cathode laminate; and a 4B step of arranging a material for the gel electrolyte layer between a surface of the first solid electrolyte layer-negative electrode laminate on the side where the first solid electrolyte layer is disposed and a surface of the second solid electrolyte layer-cathode laminate on the side where the second solid electrolyte layer is disposed and pressing the laminate to obtain the electrode laminate.

[0014] (7) The method for producing a solid-state battery according to any one of (1) to (6), wherein the solid-state battery is a solid-state lithium metal battery. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a method for manufacturing a solid-state battery that can reduce the resistance of the solid-state battery and suppress the occurrence of cracks in the electrodes. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view showing a solid-state battery according to one embodiment of the present invention. [Figure 2] 3A to 3C are cross-sectional views illustrating a method for manufacturing an intermediate layer-negative electrode stack. [Figure 3] 4A to 4C are cross-sectional views illustrating a method for manufacturing a first solid electrolyte layer-intermediate layer-negative electrode stack. [Figure 4] 5A to 5C are cross-sectional views illustrating a method for manufacturing a second solid electrolyte layer-positive electrode laminate. [Figure 5] 5A to 5C are cross-sectional views illustrating a method for manufacturing an electrode stack. [Figure 6] 5A to 5C are cross-sectional views illustrating a method for manufacturing a first solid electrolyte layer-negative electrode stack. [Figure 7] 5A to 5C are cross-sectional views illustrating a method for manufacturing an electrode stack. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] [Solid battery] FIG. 1 shows a solid-state battery according to one embodiment of the present invention.

[0019] The solid state battery 1 includes an electrode stack in which an anode 2, an intermediate layer 5, an electrolyte layer 4, a cathode 3, an electrolyte layer 4, an intermediate layer 5, and an anode 2 are sequentially stacked. The electrolyte layer 4 includes a first solid electrolyte layer 41, a gel electrolyte layer 42, and a second solid electrolyte layer 43 stacked in that order in the stacking direction of the electrode stack. In this case, part of the gel electrolyte constituting the gel electrolyte layer 42 may permeate the first solid electrolyte layer 41 and / or the second solid electrolyte layer 43.

[0020] The negative electrode 2 is formed by sequentially stacking a negative electrode composite layer 21 and a negative electrode current collector 22 in the stacking direction of the electrode stack. A negative electrode current collector tab 22a extends from one end of the negative electrode current collector 22.

[0021] The positive electrode 3 has a positive electrode composite layer 31, a positive electrode current collector 32, and a positive electrode composite layer 31 stacked in this order in the stacking direction of the electrode laminate. When the positive electrode 3 is viewed from above in the stacking direction of the electrode laminate, the outer periphery of the positive electrode composite layer 31 is located inside the outer periphery of the positive electrode current collector 32, and an insulating frame 6 is provided on the outer periphery of the positive electrode composite layer 31. When the insulating frame 6 is viewed from above in the stacking direction of the electrode laminate, the outer periphery of the insulating frame 6 is located at approximately the same position as the outer periphery of the positive electrode current collector 32. Here, a positive electrode current collector tab 32a extends from the end of the positive electrode current collector 32 opposite the side from which the negative electrode current collector tab 22a extends.

[0022] The solid-state battery 1 is not particularly limited as long as it includes an electrode laminate in which an anode 2, an intermediate layer 5, an electrolyte layer 4, and a cathode 3 are sequentially stacked. For example, the solid-state battery 1 may include a plurality of cathodes 3. The solid-state battery 1 may also include a single anode 2, a single intermediate layer 5, and a single electrolyte layer 4. In this case, the cathode 3 includes a cathode composite layer 31 and a cathode current collector 32 sequentially stacked in the stacking direction of the electrode laminate. Furthermore, the solid-state battery 1 does not necessarily have to include the intermediate layer 5.

[0023] [Solid-state battery manufacturing method] Next, a method for manufacturing the solid state battery 1 will be described with reference to FIGS.

[0024] (Intermediate layer-negative electrode laminate) The material for the intermediate layer 5 is placed on the surface of the negative electrode 2 on which the negative electrode composite layer 21 is disposed, and the negative electrode 2 is pressed to obtain an intermediate layer-negative electrode laminate L1 (Step 1A; see FIGS. 2 and 3). The method for placing the material for the intermediate layer 5 on the surface of the negative electrode 2 on which the negative electrode composite layer 21 is disposed is not particularly limited, but examples thereof include a method in which the intermediate layer 5 is transferred onto the negative electrode composite layer 21 using an intermediate layer transfer sheet. The intermediate layer transfer sheet can be obtained, for example, by dispersing the material for the intermediate layer 5 in a solvent to form a slurry, which is then applied to a support sheet and dried. The pressing pressure in Step 1A is not particularly limited, but is, for example, 400 MPa or more and 1000 MPa or less. The pressing temperature in Step 1A is not particularly limited, but is, for example, 25°C or more and 150°C or less.

[0025] (first solid electrolyte layer-intermediate layer-negative electrode stack) The material for the first solid electrolyte layer 41 is placed on the surface of the intermediate layer-negative electrode laminate L1 where the intermediate layer 5 is disposed, and the laminate is pressed to obtain a first solid electrolyte layer-intermediate layer-negative electrode laminate L2 (Step 2A; see FIGS. 3 and 5). The method for placing the material for the first solid electrolyte layer 41 on the surface of the intermediate layer-negative electrode laminate L1 where the intermediate layer 5 is disposed is not particularly limited, but examples include a method in which the first solid electrolyte layer 41 is transferred onto the intermediate layer 5 using a first solid electrolyte layer transfer sheet. The first solid electrolyte layer transfer sheet can be obtained, for example, by applying a slurry obtained by dispersing a solid electrolyte having a median diameter of 1 μm or less in a solvent to a support sheet and then drying the slurry. The pressing pressure in Step 2A is preferably higher than the pressing pressure in Step 4A, which will be described later. This densifies the first solid electrolyte layer 41 and suppresses damage and deformation of each layer. The pressing pressure in Step 2A is not particularly limited as long as it can densify first solid electrolyte layer 41, and is, for example, 600 MPa or more and 1000 MPa or less. The pressing temperature in Step 2A is not particularly limited, and is, for example, 25°C or more and 150°C or less.

[0026] The density of the first solid electrolyte layer 41 is not particularly limited, but is, for example, 1.65 g / cm 3 More than 2.00g / cm 3 The porosity of first solid electrolyte layer 41 is not particularly limited, but is, for example, 1% or more and 7% or less. The thickness of first solid electrolyte layer 41 is not particularly limited, but is, for example, 1 μm or more and 7 μm or less.

[0027] (Second solid electrolyte layer-positive electrode laminate) The second solid electrolyte layer-cathode laminate L3 is obtained by pressing the second solid electrolyte layer 43 with the material disposed on both sides of the cathode composite layer 31 and the insulating frame 6 of the cathode 3 (third step; see FIGS. 4 and 5). The method for disposing the material on both sides of the cathode composite layer 31 and the insulating frame 6 of the cathode 3 is not particularly limited, but examples include a method in which the second solid electrolyte layer 43 is transferred onto the cathode composite layer 31 and the insulating frame 6 using a second solid electrolyte layer transfer sheet. The second solid electrolyte layer transfer sheet can be obtained, for example, by applying a slurry obtained by dispersing a solid electrolyte having a median diameter of 1 μm or less in a solvent to a support sheet and then drying the slurry. The pressing pressure in the third step is preferably higher than the pressing pressure in the fourth step (described later). This densifies the second solid electrolyte layer 43 and suppresses damage and deformation of each layer. The pressing pressure in the third step is not particularly limited as long as it can densify the second solid electrolyte layer 43, and is, for example, 800 MPa or more and 1200 MPa or less. The pressing temperature in the third step is not particularly limited, and is, for example, 25°C or more and 1000°C or less.

[0028] The density of the second solid electrolyte layer 43 is not particularly limited, but is, for example, 1.65 g / cm 3 More than 2.00g / cm 3 The porosity of second solid electrolyte layer 43 is not particularly limited, but is, for example, 1% to 7%. The thickness of second solid electrolyte layer 43 is not particularly limited, but is, for example, 1 μm to 7 μm.

[0029] (electrode laminate) The material for the gel electrolyte layer 42 is placed between the surface of the first solid electrolyte layer-intermediate layer-negative electrode laminate L2 on which the first solid electrolyte layer 41 is disposed and the surface of the second solid electrolyte layer-cathode laminate L3 on which the second solid electrolyte layer 43 is disposed, and then pressed to obtain an electrode laminate (Step 4A; see FIG. 5 ). Therefore, even if the first solid electrolyte layer 41 and the second solid electrolyte layer 43 are densified, the occurrence of cracks in the negative electrode 2 and / or the positive electrode 3 is suppressed during pressing. The method for placing the material for the gel electrolyte layer 42 is not particularly limited, but examples include a method in which the gel electrolyte layer 42 is transferred onto the first solid electrolyte layer 41 or the second solid electrolyte layer 43 using a gel electrolyte layer transfer sheet. The gel electrolyte layer transfer sheet can be obtained, for example, by dispersing the material for the gel electrolyte layer 42 in a solvent, applying a slurry to a support sheet, and then drying the slurry. The pressing pressure in Step 4A is not particularly limited as long as it is possible to integrate the electrolyte layer 4, but is, for example, 500 MPa or less.

[0030] The apparatus used to manufacture the solid state battery 1 is not particularly limited, but examples thereof include a roll press and a plate press.

[0031] Next, a method for manufacturing the solid state battery 1 without the intermediate layer 5 will be described with reference to FIGS.

[0032] (First solid electrolyte layer-negative electrode laminate) The material for the first solid electrolyte layer 41 is placed on the surface of the negative electrode 2 on which the negative electrode composite layer 21 is disposed, and the negative electrode laminate L2A is then pressed (step 2B; see FIGS. 6 and 7). The method for placing the material for the first solid electrolyte layer 41 on the surface of the negative electrode 2 on which the negative electrode composite layer 21 is disposed is not particularly limited, but examples include a method in which the first solid electrolyte layer 41 is transferred onto the negative electrode composite layer 21 using a first solid electrolyte layer transfer sheet. The first solid electrolyte layer transfer sheet can be obtained, for example, by applying a slurry obtained by dispersing a solid electrolyte having a median diameter of 1 μm or less in a solvent to a support sheet and then drying the slurry. The pressing pressure is not particularly limited as long as it is possible to densify the first solid electrolyte layer 41.

[0033] (Second solid electrolyte layer-positive electrode laminate) The second solid electrolyte layer-positive electrode laminate L3 is obtained by the method described above (third step; see FIG. 4).

[0034] (electrode laminate) The material for the gel electrolyte layer 42 is placed between the surface of the first solid electrolyte layer-negative electrode laminate L2A on which the first solid electrolyte layer 41 is disposed and the surface of the second solid electrolyte layer-cathode laminate L3 on which the second solid electrolyte layer 43 is disposed, and then pressed to obtain an electrode laminate (step 4B; see FIG. 7 ). Therefore, even if the first solid electrolyte layer 41 and the second solid electrolyte layer 43 are densified, the occurrence of cracks in the negative electrode 2 and / or the positive electrode 3 during pressing is suppressed. The method for placing the material for the gel electrolyte layer 42 is not particularly limited, but examples include a method in which the gel electrolyte layer 42 is transferred onto the first solid electrolyte layer 41 or the second solid electrolyte layer 43 using a gel electrolyte layer transfer sheet. The gel electrolyte layer transfer sheet can be obtained, for example, by dispersing the material for the gel electrolyte layer 42 in a solvent, applying a slurry to a support sheet, and then drying the slurry. The pressing pressure is not particularly limited as long as it is possible to integrate the electrolyte layer 4.

[0035] The apparatus used to manufacture the solid state battery 1 without the intermediate layer 5 is not particularly limited, but examples thereof include a roll press and a plate press.

[0036] The solid-state battery 1 is not particularly limited, but may be, for example, a solid-state lithium metal battery. The following describes the case where the solid-state battery 1 is a solid-state lithium metal battery.

[0037] Negative electrode mixture layer 21 is a lithium metal layer. Negative electrode current collector 22 is not particularly limited, but may be, for example, copper foil.

[0038] The positive electrode composite layer 31 includes a positive electrode active material and may further include a solid electrolyte, a conductive additive, a binder, and the like. The positive electrode active material is not particularly limited as long as it is capable of absorbing and releasing lithium ions, and examples thereof include lithium nickel cobalt manganese composite oxide. The solid electrolyte is not particularly limited as long as it has lithium ion conductivity, and examples thereof include oxide-based electrolytes and sulfide-based electrolytes. The conductive additive is not particularly limited as long as it has electronic conductivity, and examples thereof include carbon black. The binder is not particularly limited as long as it can improve binding properties, and examples thereof include styrene butadiene rubber.

[0039] The positive electrode current collector 32 is not particularly limited, but may be, for example, aluminum foil.

[0040] The first solid electrolyte layer 41 and the second solid electrolyte layer 43 contain a solid electrolyte. The solid electrolyte is not particularly limited as long as it has lithium ion conductivity, and examples thereof include inorganic solid electrolytes such as oxide-based electrolytes and sulfide-based electrolytes. The solid electrolytes constituting the first solid electrolyte layer 41 and the second solid electrolyte layer 43 may be the same or different.

[0041] The gel electrolyte layer 42 includes a matrix resin, an electrolyte, and a solvent. The matrix resin is not particularly limited as long as it can be gelled and can integrate the electrolyte layer 4, and examples thereof include polyethylene oxide. The electrolyte is not particularly limited as long as it has lithium ion conductivity, and examples thereof include lithium salts. The solvent is not particularly limited as long as it can dissolve the electrolyte, and examples thereof include carbonate-based solvents.

[0042] The intermediate layer 5 contains a metal capable of alloying with lithium and amorphous carbon, and may further contain a binder, etc. The metal capable of alloying with lithium and amorphous carbon are preferably nanoparticles. Examples of metals capable of alloying with lithium include tin (Sn), silicon (Si), zinc (Zn), magnesium (Mg), gold (Au), platinum (Pt), palladium (Pd), silver (Ag), aluminum (Al), bismuth (Bi), and antimony (Sb). Examples of amorphous carbon include carbon blacks such as acetylene black, furnace black, and ketjen black, as well as coke and activated carbon. The amorphous carbon may be graphitizable carbon (soft carbon), non-graphitizable carbon (hard carbon), CNT (carbon nanotube), fullerene, or graphene. The binder is not particularly limited as long as it can improve binding properties, and examples include polyvinylidene fluoride (PVDF).

[0043] The intermediate layer 5 has the function of uniformly depositing lithium metal, thereby stabilizing the interface between the intermediate layer 5 and the first solid electrolyte layer 41. When the solid battery 1 has the intermediate layer 5, the solid battery 1 may be an anode-free battery in which a lithium metal layer as the negative electrode mixture layer 21 is not formed at the time of the initial charge. In the anode-free battery, a lithium metal layer as the negative electrode mixture layer 21 is formed after the initial charge / discharge.

[0044] The thickness of the intermediate layer 5 is not particularly limited, but is, for example, 4 μm or more and 10 μm or less.

[0045] The material for forming the insulating frame 6 is not particularly limited, but examples thereof include insulating oxides such as alumina, resins such as polyvinylidene fluoride (PVDF), and rubbers such as styrene-butadiene rubber (SBR).

[0046] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the above embodiments may be modified as appropriate within the scope of the present invention. For example, the solid state battery 1 may further include an exterior body (e.g., a laminate film) that covers the electrode stack. [Explanation of symbols]

[0047] 1 solid state battery 2 negative electrode 21 Negative electrode composite layer 22 Negative electrode current collector 22a Negative electrode current collecting tab 3 Positive electrode 31 Positive electrode mixture layer 32 Positive electrode current collector 32a Positive electrode current collecting tab 4 Electrolyte layer 41 First solid electrolyte layer 42 Gel electrolyte layer 43 Second solid electrolyte layer 5. Middle class 6 Insulation frame L1 Intermediate layer-negative electrode laminate L2 1st solid electrolyte layer-intermediate layer-negative electrode stack L2A 1st solid electrolyte layer-negative electrode stack L3 Second solid electrolyte layer-positive electrode laminate

Claims

1. A method for manufacturing a solid-state battery including an electrode stack in which a negative electrode, an intermediate layer, an electrolyte layer, and a positive electrode are stacked in this order, comprising the steps of: the electrolyte layer includes a first solid electrolyte layer, a gel electrolyte layer, and a second solid electrolyte layer stacked in this order in the stacking direction of the electrode stack; a first step A of placing a material constituting the intermediate layer on the negative electrode and pressing the material to obtain an intermediate layer-negative electrode laminate; a second step A of placing a material for forming the first solid electrolyte layer on a surface of the intermediate layer-negative electrode laminate on which the intermediate layer is disposed, and pressing the laminate to obtain a first solid electrolyte layer-intermediate layer-negative electrode laminate; a third step of placing a material constituting the second solid electrolyte layer on the positive electrode and pressing the material to obtain a second solid electrolyte layer-positive electrode laminate; and a step (4A) of placing a material constituting the gel electrolyte layer between a surface of the first solid electrolyte layer-intermediate layer-negative electrode laminate on which the first solid electrolyte layer is disposed and a surface of the second solid electrolyte layer-cathode laminate on which the second solid electrolyte layer is disposed, and pressing the materials to obtain the electrode laminate.

2. The method for manufacturing a solid-state battery according to claim 1 , wherein the pressing pressure in the second A step is higher than the pressing pressure in the fourth A step.

3. The method for manufacturing a solid-state battery according to claim 2 , wherein the pressing pressure in the second A step is 600 MPa or more and 1000 MPa or less.

4. The method for manufacturing a solid-state battery according to claim 1 , wherein the pressing pressure in the third step is higher than the pressing pressure in the fourth step.

5. The method for producing a solid-state battery according to claim 4 , wherein the pressing pressure in the third step is 800 MPa or more and 1200 MPa or less.

6. A method for manufacturing a solid-state battery including an electrode stack in which a negative electrode, an electrolyte layer, and a positive electrode are stacked in this order, comprising the steps of: the electrolyte layer includes a first solid electrolyte layer, a gel electrolyte layer, and a second solid electrolyte layer stacked in this order in the stacking direction of the electrode stack; a second step B of placing a material constituting the first solid electrolyte layer on the negative electrode and pressing the material to obtain a first solid electrolyte layer-negative electrode laminate; a third step of placing a material constituting the second solid electrolyte layer on the positive electrode and pressing the material to obtain a second solid electrolyte layer-positive electrode laminate; and a fourth step B of placing a material constituting the gel electrolyte layer between a surface of the first solid electrolyte layer-negative electrode laminate on which the first solid electrolyte layer is disposed and a surface of the second solid electrolyte layer-cathode laminate on which the second solid electrolyte layer is disposed, and pressing the materials to obtain the electrode laminate.

7. The method for manufacturing a solid-state battery according to claim 1 or 6, wherein the solid-state battery is a solid-state lithium metal battery.

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