Solid-state battery

Abstract

A problem addressed by this disclosure is to provide a solid-state battery whereby high-pressure pressing and thinning of a solid electrolyte layer is possible and durability can be improved. An embodiment for solving said problem is a solid-state battery structured so as to have a negative electrode layer, a solid electrolyte layer, and a positive electrode layer stacked in the stated order, wherein the solid electrolyte layer comprises one or more layers, and the limit distortion of at least one of those layers is 0.5% or more.

Description

solid state battery

[0001] The present invention relates to a solid-state battery.

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

[0003] Known examples of such secondary batteries include solid-state batteries such as lithium metal batteries and lithium ion secondary batteries, in which a solid electrolyte layer is disposed between a positive electrode layer and a negative electrode layer.

[0004] Known technologies relating to solid-state batteries include technologies relating to all-solid-state batteries that have a first solid electrolyte layer adjacent to a negative electrode and a second solid electrolyte layer located between the first solid electrolyte layer and a positive electrode, in which the first solid electrolyte layer has a smaller Young's modulus than the second solid electrolyte layer (see, for example, Patent Document 1).

[0005] Japanese Patent Application Laid-Open No. 2022-108202

[0006] The technology disclosed in Patent Document 1 suppresses deterioration of the interfacial contact between the solid electrolyte layer and the positive and negative electrode layers by setting the Young's modulus while forming a multi-layered solid electrolyte layer, thereby suppressing voltage drop during self-discharge. However, various functions are required of the solid electrolyte layer. For example, it is important to improve the applicability of the layered solid electrolyte layer to simultaneously press it under high pressure when densifying the positive electrode, and to reduce the thickness to improve energy density. Therefore, there is room for improvement in the desirable specifications of the solid electrolyte layer.

[0007] The present invention has been made in view of the above, and an object of the present invention is to provide a solid-state battery in which the solid electrolyte layer can be pressed under high pressure and made thin, and in which durability can be improved.

[0008] (1) A solid-state battery having a structure in which an anode layer, a solid electrolyte layer, and a cathode layer are stacked in this order, the solid electrolyte layer being composed of one or more layers, and at least one of the layers having a critical strain of 0.5% or more.

[0009] According to the invention of (1), it is possible to provide a solid-state battery that can perform high-pressure pressing and thinning of the solid electrolyte layer, thereby improving durability.

[0010] (2) The solid-state battery according to (1), wherein the solid electrolyte layer is composed of one layer and has a critical strain of 0.5% or more.

[0011] According to the invention (2), in a solid-state battery having one solid electrolyte layer, the function of the solid electrolyte layer can be improved.

[0012] (3) The solid-state battery according to (1), wherein the solid electrolyte layer is composed of two layers, a solid electrolyte layer disposed on a positive electrode side and a solid electrolyte layer disposed on a negative electrode side, and at least one of the solid electrolyte layers has a critical strain of 0.5% or more.

[0013] According to the invention (3), in a solid state battery having two solid electrolyte layers, the function of the solid electrolyte layer can be improved.

[0014] (4) The solid-state battery according to (1), wherein the solid electrolyte layer includes a first solid electrolyte layer, a second solid electrolyte layer, and a third solid electrolyte layer arranged in this order from the positive electrode layer side, and at least any one of the solid electrolyte layers has a critical strain of 0.5% or more.

[0015] According to the invention (4), in a solid state battery having three solid electrolyte layers, the function of the solid electrolyte layer can be improved.

[0016] (5) The solid state battery according to any one of (1) to (4), wherein the solid electrolyte layer having a critical strain of 0.5% or more contains a fluorine-based binder.

[0017] According to the invention of (5), the critical strain of the solid electrolyte layer can be easily controlled to 0.5% or more.

[0018] (6) The solid state battery according to any one of (1) to (5), wherein the content of the binder in the solid electrolyte layer having a critical strain of 0.5% or more is 5% by volume or more and 25% by volume or less.

[0019] According to the invention of (6), the critical strain of the solid electrolyte layer can be easily controlled to 0.5% or more.

[0020] (7) The solid state battery according to any one of (1) to (6), wherein the particle diameter (D50) of the solid electrolyte contained in the solid electrolyte layer having a critical strain of 0.5% or more is 0.1 μm or more and 3 μm or less.

[0021] According to the invention of (7), the limit strain of the solid electrolyte layer can be easily controlled to 0.5% or more, and both thinning of the layer and preferable ionic conductivity can be achieved.

[0022] (8) The solid state battery according to any one of (1) to (7), wherein the particle diameter (D50) of the solid electrolyte contained in the solid electrolyte layer having a critical strain of 0.5% or more is 0.1 μm or more and 1 μm or less.

[0023] According to the invention of (8), the limit strain of the solid electrolyte layer can be easily controlled to 0.5% or more, and both thinning of the layer and preferable ionic conductivity can be achieved.

[0024] (9) The solid state battery according to any one of (1) to (8), wherein the thickness of the solid electrolyte layer having a critical strain of 0.5% or more is 1 μm or more and 23 μm or less.

[0025] According to the invention of (9), the solid electrolyte layer is thinned, thereby improving the energy density of the solid battery.

[0026] (10) The solid-state battery according to (9), wherein the solid electrolyte layer is composed of two layers: a solid electrolyte layer disposed on the positive electrode side and a solid electrolyte layer disposed on the negative electrode side.

[0027] According to the invention of (10), the solid electrolyte layer is thinned, thereby improving the energy density of the solid battery.

[0028] (11) The solid-state battery according to (9), wherein the solid electrolyte layer includes a first solid electrolyte layer, a second solid electrolyte layer, and a third solid electrolyte layer arranged in this order from the positive electrode layer side.

[0029] According to the invention of (11), the solid electrolyte layer is thinned, thereby improving the energy density of the solid battery.

[0030] (12) The solid-state battery according to (11), wherein the first solid electrolyte layer has a limit strain of 0.5% or more.

[0031] According to the invention of (12), it is possible to provide a solid-state battery in which the solid electrolyte layer can be pressed under high pressure and made thin, and durability can be improved.

[0032] (13) The solid state battery according to any one of (1) to (12), wherein at least one of the one or more layers constituting the solid electrolyte layer contains a support.

[0033] According to the invention of (13), the strength of the solid electrolyte layer is improved, so that the solid electrolyte layer can be made thinner and the energy density of the solid battery can be improved.

[0034] 1 is a cross-sectional view showing a solid-state battery according to one embodiment of the present invention.

[0035] [Solid-State Battery] As shown in Fig. 1, the solid-state battery 1 has an electrode laminate in which an anode layer 2, a solid electrolyte layer 4, and a cathode layer 3 are laminated in this order. In this embodiment, the structure in which the anode layer 2, the solid electrolyte layer 4, the cathode layer 3, the solid electrolyte layer 4, and the anode layer 2 are laminated in this order as shown in Fig. 1 will be described as the laminate structure of the solid-state battery 1. However, the structure of the solid-state battery 1 is not limited to the above, and it is sufficient if the solid-state battery 1 has a structure in which the solid electrolyte layer 4 is laminated between the anode layer 2 and the cathode layer 3.

[0036] The solid state battery 1 is not particularly limited, but may be a lithium ion solid state secondary battery or a lithium metal secondary battery.

[0037] (Solid Electrolyte Layer) The solid electrolyte layer 4 in the solid battery 1 is composed of one layer or multiple layers. In the configuration of Fig. 1, the solid electrolyte layer 4 has a first solid electrolyte layer 43 arranged on the positive electrode layer 3 side, a second solid electrolyte layer 42 arranged adjacent to the first solid electrolyte layer 43, and a third solid electrolyte layer 41 arranged on the negative electrode layer 2 side. The configuration of the solid electrolyte layer 4 is not limited to the above. The solid electrolyte layer 4 may be composed of one layer or two layers.

[0038] When the solid electrolyte layer 4 consists of a single layer, the limit strain of that layer is 0.5% or more. When the solid electrolyte layer 4 consists of multiple layers, the limit strain of at least one of the multiple solid electrolyte layers is 0.5% or more. When the solid electrolyte layer 4 includes a layer with a limit strain of 0.5% or more, high-pressure pressing and thinning of the solid electrolyte layer become possible. Furthermore, the durability of the solid-state battery 1 can be improved.

[0039] The thickness of the layer of the solid electrolyte layer 4 having a critical strain of 0.5% or more is preferably 1 μm or more and 23 μm or less. When the solid electrolyte layer 4 is composed of multiple layers, it is preferable that at least the solid electrolyte layer arranged on the cathode layer side (e.g., the first solid electrolyte layer 43 described below) has a critical strain of 0.5% or more and a layer thickness of 1 μm or more and 23 μm or less. When the cathode layer 3 is pressed to densify it, the solid electrolyte layer and the cathode layer 3 can be laminated and pressed. In this case, since the critical strain of the solid electrolyte layer arranged on the cathode layer 3 side, such as the first solid electrolyte layer 43, is 0.5% or more, the solid electrolyte layer can be stretched in accordance with the cathode layer 3 while maintaining its structure. Furthermore, when the solid electrolyte layer is pressed together with the cathode layer 3, the bonding strength between the solid electrolyte layer and the cathode layer 3 is improved.

[0040] In this specification and claims, the term "critical strain" refers to the critical strain measured in a mandrel test. The mandrel test is performed by wrapping a sheet-like solid electrolyte layer densified to a porosity of 4% or less around a cylinder of a predetermined diameter in the circumferential direction, and then reducing the diameter of the cylinder to determine the diameter at which cracks occur. The critical strain is calculated by the following formula (1): Critical strain (%) = t / (D + t) (1)

[0041] In the above formula (1), t represents the thickness of the solid electrolyte layer, and D represents the diameter of the cylinder when a crack occurs.

[0042] The solid electrolyte material constituting the solid electrolyte layer 4 is not particularly limited, and may be any material that can be used as an electrolyte in a solid-state battery. Examples include inorganic solid electrolytes such as sulfide solid electrolyte materials, oxide solid electrolyte materials, halide solid electrolytes, and lithium-containing salts, and polymer solid electrolytes such as polyethylene oxide. The above solid electrolytes may be used alone or in combination of two or more.

[0043] In addition to the solid electrolyte material, the solid electrolyte layer 4 may contain a material that can be used in a solid electrolyte layer of a solid-state battery. For example, the solid electrolyte layer 4 preferably contains a binder. Examples of the binder include a fluorine-based polymer, a nitrile-based polymer, a polyester-based polymer, an acrylic acid-based polymer, a cellulose-based polymer, a styrene-based polymer, a styrene-butadiene (SBR)-based polymer, a vinyl acetate-based polymer, and a urethane-based polymer.

[0044] The binder contained in the layer of the solid electrolyte layer 4 having a critical strain of 0.5% or more is preferably a fluorine-based polymer (fluorine-based binder). Examples of the fluorine-based binder include PVdF (polyvinylidene fluoride). This makes it possible to easily control the critical strain of the solid electrolyte layer to 0.5% or more.

[0045] Of the solid electrolyte layers 4, the first solid electrolyte layer 43 disposed on the positive electrode layer 3 side preferably has a larger binder amount than the second solid electrolyte layer 42 and the third solid electrolyte layer 41. This can suppress the occurrence of cracks in the first solid electrolyte layer 43 when the positive electrode layer 3 is densified by pressing at high pressure with the first solid electrolyte layer 43 joined to the positive electrode layer 3.

[0046] The content of the binder contained in the layer having a critical strain of 0.5% or more in the solid electrolyte layer 4 is preferably 5% by volume or more and 25% by volume or less in the solid electrolyte layer, which makes it possible to easily control the critical strain of the solid electrolyte layer to 0.5% or more.

[0047] The particle size (D50) of the solid electrolyte contained in the layer having a critical strain of 0.5% or more in the solid electrolyte layer 4 is preferably 0.1 μm or more and 3 μm or less, and more preferably 0.1 μm or more and 1 μm or less, which makes it easy to control the critical strain of the solid electrolyte layer to 0.5% or more, and allows both thinning of the layer and desirable ionic conductivity to be achieved.

[0048] It is preferable that a support be contained in at least one of the one or more layers constituting the solid electrolyte layer 4. Examples of the support include three-dimensional structures such as mesh, woven fabric, nonwoven fabric, embossed body, punched body, expanded body, and foamed body.

[0049] (Negative Electrode Layer) The negative electrode layer 2 has an anode active material layer 21 and an anode current collector layer 22. The anode active material layer 21 is not particularly limited and can be made of a material that can be used as an anode active material for a solid-state battery. The anode active material layer 21 is preferably a lithium metal layer in which the anode active material is lithium metal. This is because the solid-state battery 1 according to this embodiment is a lithium metal battery that experiences large expansion and contraction during charging and discharging, and cracks are unlikely to occur in the solid electrolyte layer. The lithium metal includes not only elemental lithium metal but also lithium alloys. The anode active material layer 21 can also be made of silicon-based active materials such as Si and Si alloys, lithium titanate (Li ４ Ti ５ O １２ ), lithium transition metal oxides such as TiO ２ , Nb ２ O ３ and W.O. ３ The conductive material may be composed of transition metal oxides such as those mentioned above, metal sulfides, metal nitrides, carbon materials such as graphite, soft carbon and hard carbon, metallic indium, or the like.

[0050] The negative electrode active material layer 21 may contain materials that can be contained in the negative electrode active material layer of a solid-state battery, in addition to the above. Examples of such materials include a solid electrolyte, a conductive additive, and a binder. Examples of the solid electrolyte include the same solid electrolyte as that contained in the solid electrolyte layer 4. Examples of the conductive additive include carbon black, natural graphite, carbon fiber, and carbon nanotubes. Examples of the binder include the same type of binder as that contained in the solid electrolyte layer described above.

[0051] The negative electrode current collector layer 22 is not particularly limited, and may be made of copper, nickel, stainless steel, aluminum (Al), or the like. Examples of the shape of the negative electrode current collector layer 22 include foil, plate, mesh, nonwoven fabric, and foam. A portion of the negative electrode current collector layer 22 extends in a predetermined direction to form a negative electrode current collector tab 22a.

[0052] (Positive Electrode Layer) The positive electrode layer 3 has a positive electrode active material layer 31 and a positive electrode current collector layer 32. In this embodiment, the positive electrode layer 3 has a configuration in which two positive electrode active material layers 31 are stacked on both sides of one positive electrode current collector layer 32. However, the configuration of the positive electrode layer 3 is not limited to the above, and the positive electrode layer 3 may have a configuration in which one positive electrode active material layer 31 is stacked on one side of one positive electrode current collector layer 32.

[0053] The positive electrode active material layer 31 is not particularly limited and can be made of a material that can be used as a positive electrode active material for a solid-state battery. Examples of the positive electrode active material that can be used to make the positive electrode active material layer 31 include LiCoO ２ , LiNiO ２ , LiCo ｘ Ni ｙ Mn ｚ O ２ (x+y+z=1), LiVO ２ , LiCrO ２ Layered positive electrode active material particles such as LiMn ２ O ４ , Li(Ni ０．２５ Mn ０．７５ ) ２ O ４ , LiCoMnO ４ , Li ２ NiMn ３ O ８Spinel-type positive electrode active materials such as LiCoPO ４ , LiMnPO ４ , LiFePO ４ Olivine-type positive electrode active materials such as solid solution oxides (Li ２ MnO ３ -LiMO ２ (M=Co, Ni, etc.), conductive polymers such as polyaniline and polypyrrole, Li ２ S, CuS, Li-Cu-S compound, TiS ２ , FeS, MoS ２ , sulfides such as Li—Mo—S compounds, mixtures of sulfur and carbon, etc. The positive electrode active material may be one of the above materials, or may be composed of two or more of the above materials.

[0054] An insulating frame 6 may be provided on the outer periphery of the positive electrode active material layer 31. The insulating frame 6 can prevent short-circuiting of the solid state battery 1 and improve its strength. In this embodiment, the insulating frame 6 is arranged so as to cover the side surfaces of the two positive electrode active material layers 31 formed on both sides of the positive electrode current collector layer 32. The insulating frame 6 also abuts against a portion of the stacking surface of the positive electrode current collector layer 32, and has a gap through which a positive electrode current collector tab 32a (described later) extends. The material constituting 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).

[0055] The positive electrode current collector layer 32 is not particularly limited, and can be made of, for example, aluminum, stainless steel, conductive carbon (graphite, carbon nanotubes, etc.), etc. Examples of the shape of the positive electrode current collector layer 32 include foil, plate, mesh, nonwoven fabric, and foam. A portion of the positive electrode current collector layer 32 extends in a predetermined direction to form a positive electrode current collector tab 32a.

[0056] (Intermediate Layer) The intermediate layer 5 is optionally disposed between the anode layer 2 and the solid electrolyte layer 4. For example, when the solid battery 1 is a lithium metal battery, the intermediate layer 5 has the function of uniformly depositing lithium metal. Therefore, the interface between the intermediate layer 5 and the solid electrolyte layer 4 is stabilized. When the solid battery 1 is a lithium metal secondary battery having the intermediate layer 5, the solid battery 1 may be an anode-free battery in which the anode active material layer 21 is not present during the initial charge. In this case, a lithium metal layer is formed as the anode active material layer 21 after the initial charge / discharge. Note that the solid battery 1 does not necessarily have to have the intermediate layer 5.

[0057] The material constituting the intermediate layer 5 is not particularly limited, but examples thereof include metals capable of alloying with lithium and amorphous carbon. 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), antimony (Sb), and indium (In). The metal capable of alloying with lithium may be nanoparticles. Examples of amorphous carbon include carbon blacks such as acetylene black, furnace black, and ketjen black, coke, and activated carbon. The amorphous carbon may be easily graphitized carbon (soft carbon), difficult-to-graphitize carbon (hard carbon), CNT (carbon nanotube), fullerene, or graphene. The intermediate layer may contain a binder in addition to the above materials.

[0058] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. The solid-state battery 1 may have a configuration that can be used in solid-state batteries, such as an exterior body, in addition to the electrode stack shown in FIG.

[0059] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the contents of the following examples.

[0060] [Preparation of Solid Electrolyte Sheet] A dispersion of sulfide solid electrolyte (D50: 0.1 to 3 μm) was applied and dried to prepare a solid electrolyte sheet. In addition to the solid electrolyte, the dispersion contained the binder in the amount shown in Table 1 below. The prepared solid electrolyte sheet was pressed, and the porosity was measured by the following method, and it was confirmed that the porosity was 4% or less.

[0061] (Porosity Measurement) The porosity (%) was measured as follows. First, an SEM cross-sectional photograph of the target solid electrolyte sheet was taken, and voids were extracted within a predetermined area by image processing. Next, the total area of ​​the calculated void portions was calculated, and the value obtained by dividing this by the total area of ​​the corresponding portion was determined as the porosity (%).

[0062] [Measurement of critical strain] A mandrel test was performed using each solid electrolyte sheet prepared as described above to measure the critical strain. Each solid electrolyte sheet was wrapped around a cylinder of a predetermined diameter in the circumferential direction, and the diameter of the cylinder was reduced to determine the diameter at which cracks occurred. The critical strain was calculated using the following formula (1): Critical strain (%) = t / (D + t) (1)

[0063] In the above formula (1), t represents the thickness of the solid electrolyte layer, and D represents the diameter of the cylinder when a crack occurs.

[0064] [Cross-section observation] NCM622 was used as the positive electrode, and each of the solid electrolyte sheets prepared above was attached to it and roll pressed at 980 MPa. The cross section of the pressed sample was observed with an SEM and evaluated according to the following criteria. The results are shown in Table 1. 3: No cracks 2: Complete cracks not observed 1: Cracks present

[0065]

[0066] As shown in Table 1, when a fluorine-based binder is used as the binder, it is clear that the critical strain can be made 0.5% or more by setting the binder concentration in the solid electrolyte layer to 5% by volume or more. Also, when an SBR-based binder is used, it is clear that the critical strain can be made 0.5% or more by setting the binder concentration in the solid electrolyte layer to 20% by volume or more.

[0067] [Fabrication of Test Solid State Battery Cells] Test solid state battery cells were fabricated using the above-described solid electrolyte sheets according to the following procedure.

[0068] [Preparation of Positive Electrode Layer] A 12.0 μm thick aluminum foil was prepared as a positive electrode current collector. 60.0 parts by mass of lithium nickel cobalt manganese composite oxide (NCM622) was used as the positive electrode active material, 35.8 parts by mass of a sulfide solid electrolyte was used as the solid electrolyte, 2.9 parts by mass of acetylene black (DENKA BLACK Li-100, manufactured by Denka Co., Ltd.) was used as the conductive additive, and 1.3 parts by mass of an SBR (styrene butadiene rubber) binder were mixed together. The resulting mixture was dispersed in a solvent to prepare a positive electrode active material slurry. The resulting positive electrode active material slurry was applied to both sides of the positive electrode current collector so that the basis weight after drying was 27.4 mg / cm. ２ The solution was applied using a bar coater so as to form a positive electrode layer, and then dried.

[0069] [Preparation of Negative Electrode Layer] A copper foil having a thickness of 10 μm was prepared as a negative electrode current collector. A metallic lithium foil having a thickness of 6.5 μm was laminated on the surface of the copper foil to prepare a negative electrode layer.

[0070] [Fabrication of Solid-State Battery Cell] The cathode layer, solid electrolyte layer, and anode layer obtained above were stacked and press-bonded to fabricate an electrode laminate. The solid electrolyte layers used were those shown in Tables 2 and 3 below. A test solid-state battery cell was fabricated using the fabricated electrode laminate.

[0071] [Cell charge-discharge test] A charge-discharge test was performed using the test solid-state battery cell obtained as described above. A cell whose second charge-discharge capacity was 95% or more of the first charge-discharge capacity was rated as pass "2". A cell whose second charge-discharge capacity was less than 95% was rated as fail "1". The results are shown in Tables 2 and 3.

[0072] [Voltage Measurement] The test solid state battery cell obtained as described above was fully charged and then left for 24 hours, and the voltage was measured after 20 hours and 24 hours. A voltage difference (ΔV / h) of 1.5 mV or less was rated as pass "2", and a voltage difference of more than 1.5 mV was rated as fail "1". The results are shown in Tables 2 and 3.

[0073]

[0074]

[0075] REFERENCE SIGNS LIST 1 Solid-state battery 2 Anode layer 3 Cathode layer 4 Solid electrolyte layer 41 Third solid electrolyte layer 42 Second solid electrolyte layer 43 First solid electrolyte layer

Claims

1. A solid-state battery having a structure in which an anode layer, a solid electrolyte layer, and a cathode layer are stacked in this order, wherein the solid electrolyte layer consists of one or more layers, and at least one of the layers has a critical strain of 0.5% or more.

2. The solid-state battery according to claim 1, wherein the solid electrolyte layer is composed of a single layer and has a limit strain of 0.5% or more.

3. The solid-state battery according to claim 1, wherein the solid electrolyte layer is composed of two layers, one disposed on the positive electrode side and the other disposed on the negative electrode side, and at least one of the solid electrolyte layers has a critical strain of 0.5% or more.

4. The solid-state battery according to claim 1, wherein the solid electrolyte layer comprises a first solid electrolyte layer, a second solid electrolyte layer, and a third solid electrolyte layer arranged in this order from the positive electrode layer side, and at least one of the solid electrolyte layers has a critical strain of 0.5% or more.

5. The solid state battery according to claim 1, wherein the solid electrolyte layer having a critical strain of 0.5% or more contains a fluorine-based binder.

6. The solid-state battery according to claim 1, wherein the binder content in the solid electrolyte layer having a critical strain of 0.5% or more is 5% by volume or more and 25% by volume or less.

7. The solid-state battery according to claim 1, wherein the particle diameter (D50) of the solid electrolyte contained in the solid electrolyte layer having a critical strain of 0.5% or more is 0.1 μm or more and 3 μm or less.

8. The solid-state battery according to claim 1, wherein the particle diameter (D50) of the solid electrolyte contained in the solid electrolyte layer having a critical strain of 0.5% or more is 0.1 μm or more and 1 μm or less.

9. The solid-state battery according to claim 1, wherein the thickness of the solid electrolyte layer having a critical strain of 0.5% or more is 1 μm or more and 23 μm or less.

10. The solid-state battery according to claim 9, wherein the solid electrolyte layer is composed of two layers: a solid electrolyte layer disposed on the positive electrode side, and a solid electrolyte layer disposed on the negative electrode side.

11. The solid-state battery according to claim 9, wherein the solid electrolyte layer comprises, in order from the positive electrode layer side, a first solid electrolyte layer, a second solid electrolyte layer, and a third solid electrolyte layer.

12. The solid-state battery according to claim 11, wherein the limit strain of the first solid electrolyte layer is 0.5% or more.

13. The solid-state battery according to claim 1, wherein at least one of the one or more layers constituting the solid electrolyte layer contains a support.

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