JP2021012835A - All-solid battery - Google Patents

Abstract

To provide an all-solid battery having an excellent battery characteristic.SOLUTION: An all-solid battery in the present invention is formed by housing a power generation element containing a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode inside a metal container. At least one of the positive electrode, the negative electrode, and the solid electrolyte layer contains a sulfide-based solid electrolyte. A coated layer of gold or platinum is formed in an inner surface of the metal container.SELECTED DRAWING: Figure 2

Description

The present invention relates to an all-solid-state battery having excellent battery characteristics.

An all-solid-state battery having a solid electrolyte layer between the positive electrode and the negative electrode and also containing the solid electrolyte in the positive electrode and the negative electrode can generate lithium ions between the positive electrode and the negative electrode when a trouble such as a short circuit occurs. Abnormal heat generation of the solid electrolyte layer responsible for movement is unlikely to occur, and it has excellent reliability as compared with, for example, a lithium ion secondary battery using an organic electrolytic solution.

Examples of solid electrolytes that can be used in all-solid-state batteries include oxide-based ones, sulfide-based ones, and hydride-based ones. However, since the characteristics of all-solid-state batteries can be further enhanced, sulfide-based solids The application of electrolytes is progressing.

However, the sulfide-based solid electrolyte may generate a reactive gas such as hydrogen sulfide by a direct reaction with the battery material or a reaction with water, and this reactive gas tends to cause deterioration of the battery material. In particular, when the battery container is made of a metal such as stainless steel (metal container), the inner surface is corroded by the above-mentioned reactive gas, so that the contact resistance with the positive electrode and the negative electrode is increased and the battery characteristics are deteriorated. It becomes a factor. Further, when the sulfide-based solid electrolyte itself comes into contact with the inner surface of the metal container, the inner surface of the metal container may be corroded and the battery characteristics may be deteriorated.

On the other hand, studies have also been made to suppress deterioration of battery materials due to sulfide-based solid electrolytes. For example, in Patent Document 1, a battery is provided by using a negative electrode in which a negative electrode active material layer containing a sulfide-based solid electrolyte whose surface layer is coated with a non-sulfide material and a negative electrode active material is formed on the surface of a negative electrode current collector. A technique for suppressing the occurrence of problems due to corrosion of the negative electrode current collector due to the sulfide-based solid electrolyte has been proposed.

However, if the sulfide-based solid electrolyte, which is the medium for the movement of lithium ions in the battery, is coated with another material, the effect of improving the battery characteristics of the all-solid-state battery by using the sulfide-based solid electrolyte is sufficient. There is a risk that it will not be possible to secure it.

By the way, in a battery having a metal battery container, improvement of not only the power generation element inside the battery but also the battery container is being studied from the viewpoint of improving the battery characteristics. For example, in Patent Document 2, in a flat battery having a battery container composed of an outer can, a sealing plate, and a gasket, a nickel plating layer is formed on the surface of a base material constituting the outer can, and the nickel plating layer is formed. A technique for forming a gold-plated layer on the surface of the surface has been proposed.

Japanese Unexamined Patent Publication No. 2015-153628 Japanese Unexamined Patent Publication No. 2006-260983

An object of the present invention is to provide an all-solid-state battery having excellent battery characteristics.

The all-solid-state battery of the present invention comprises a power generation element including a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode in a metal container, and the positive electrode, the negative electrode, and the solid At least one of the electrolyte layers contains a sulfide-based solid electrolyte, and is characterized in that a gold or platinum coating layer is formed on the inner surface of the metal container.

According to the present invention, it is possible to provide an all-solid-state battery having excellent battery characteristics.

It is a vertical sectional view schematically showing an example of the all-solid-state battery of this invention. It is a partially enlarged view of FIG.

In the all-solid-state battery of the present invention, at least one of the positive electrode, the negative electrode and the solid electrolyte layer contains a sulfide-based solid electrolyte, and the inner surface of the metal container containing the power generation element including the positive electrode, the negative electrode and the solid electrolyte layer. A gold or platinum coating layer is formed on the surface.

FIG. 1 shows a vertical cross-sectional view schematically showing an example of the all-solid-state battery of the present invention. In the all-solid-state battery 1 shown in FIG. 1, a laminated electrode body formed by laminating a positive electrode 10 and a negative electrode 20 with a solid electrolyte layer 30 interposed therebetween is interposed between the outer can 40 and the sealing plate 50. It is enclosed in a battery container (a flat battery container called a coin-shaped or button-shaped battery container) formed by the gasket 60. In the all-solid-state battery 1 shown in FIG. 1, the sealing plate 50 is fitted into the opening of the outer can 40 via the gasket 60, and the opening end of the outer can 40 is tightened inward, thereby. When the gasket 60 comes into contact with the sealing plate 50, the opening of the outer can 40 is sealed and the inside of the battery is sealed. Then, the upper surface of the negative electrode 20 in the drawing is electrically connected by contacting the inner surface of the sealing plate 50 which also serves as the negative electrode terminal, and the lower surface of the positive electrode 10 in the drawing is in contact with the inner surface of the outer can 40 which also serves as the positive electrode terminal. It is electrically connected. In the battery shown in FIG. 1, the outer can 40 and the sealing plate 50 correspond to a metal container for accommodating a power generation element.

FIG. 2 shows an enlarged drawing of the circled portion of FIG. The metal container of the all-solid-state battery 1 (sealing plate 50 in FIG. 2) has a nickel layer (base layer) 52 on the surface of the base material 51, and a gold or platinum coating layer 53 on the surface of the nickel layer 52. have. Further, although not shown in FIGS. 1 and 2, the outer can 40, which is a metal container constituting the battery container, also has a nickel layer (underlayer) on its surface, and gold or platinum is used on the surface of the nickel layer. It has a coating layer.

As described above, in the all-solid-state battery of the present invention, the inner surface of the metal container (in the case of a battery container having a metal outer can and a metal sealing plate as shown in FIG. 1, the outer can and the sealing). A coating layer of gold or platinum is formed on the inner surface of the plate). In the all-solid-state battery of the present invention, the action of the coating layer causes the sulfide-based solid electrolyte to come into direct contact with the inner surface of the metal container, or the reactive gas derived from the sulfide-based solid electrolyte is generated inside the battery. However, since it is possible to suppress corrosion of the inner surface of the metal container, it is possible to suppress an increase in contact resistance between the positive electrode or the negative electrode and the metal container, and maintain excellent battery characteristics.

As the battery container including the metal container used for the all-solid-state battery, a flat battery container formed of an outer can and a sealing plate (further, a gasket) as shown in FIG. 1 and a lithium ion secondary battery are widely used. Examples thereof include a square (square cylinder) or cylindrical metal battery container.

For the base material of the metal container, it is possible to use iron, iron-based alloys such as stainless steel, etc., which are used as materials for metal containers in ordinary lithium-ion secondary batteries and all-solid-state batteries. it can. The thickness of the base material is preferably 0.07 to 1.0 mm, for example.

The gold or platinum coating layer formed on the inner surface of the metal container may be formed only of gold (and unavoidable impurities) or platinum (and unavoidable impurities), and may be formed of other elements (such as nickel) as long as the corrosion resistance is not impaired. ) May be contained.

The gold or platinum coating layer can be formed by an electroplating method, a hot-dip plating method, a vapor deposition plating method, or the like.

The thickness of the gold or platinum coating layer is preferably 0.05 μm or more, more preferably 0.1 μm or more, from the viewpoint of better ensuring the above-mentioned effect of its formation. However, even if the coating layer of gold or platinum is thickened, not only the effect is saturated, but also the manufacturing cost of the battery is increased and the productivity is lowered. Therefore, the thickness is 0.5 μm or less. It is preferably 0.2 μm or less, and more preferably 0.2 μm or less.

The gold or platinum coating layer may be formed on the inner surface of the metal container, but may also be formed on the outer surface as shown in FIG.

The gold or platinum coating layer may be formed directly on the surface of the base material constituting the metal container, but as shown in FIG. 2, when formed on the surface of the base layer provided on the base material, for example, gold or It is preferable because the adhesion of the platinum coating layer can be improved and the deterioration of the battery characteristics due to the sulfide-based solid electrolyte can be suppressed to a higher degree. Examples of the base layer include a nickel layer (a layer containing nickel or a nickel alloy and unavoidable impurities).

When the base layer is a nickel layer, it can be formed by an electroplating method, a hot-dip plating method, a vapor deposition plating method, or the like. When the base layer is a nickel layer, the thickness thereof is preferably 1 to 10 μm.

In the case of a battery container having an outer can and a sealing plate, the shape may be polygonal (triangle, quadrangle, pentagon, hexagon, heptagon, octagon) in plan view, and circular or oval in plan view. It may be.

In the case of a battery container having an outer can and a sealing plate, a gasket is usually interposed between the outer can and the sealing plate as shown in FIG. 1, but polypropylene, nylon, etc. are used as the material of the gasket. In addition, if heat resistance is required in relation to the application of the battery, fluororesin such as tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), polyphenylene ether (PEE), polysulphon (PSF) , Polyetherlate (PAR), polyether sulphon (PES), polyphenylene sulfide (PPS), polyether ether ketone (PEEK) and other heat-resistant resins having a melting point of more than 240 ° C. can also be used. Further, when the battery is applied to an application requiring heat resistance, a glass hermetic seal can be used for the sealing.

The positive electrode of an all-solid-state battery contains a positive electrode active material and usually contains a solid electrolyte.

The positive electrode active material is not particularly limited as long as it is a positive electrode active material used in a conventionally known lithium ion secondary battery, that is, an active material capable of storing and releasing Li ions. Specific examples of the positive electrode active material include LiM _x Mn _2-x O ₄ (where M is Li, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Co, Ni, Cu, Al. , Sn, Sb, In, Nb, Mo, W, Y, Ru and Rh, which is at least one element selected from the group consisting of, and is represented by 0.01 ≦ x ≦ 0.5). manganese complex _{oxide, Li x Mn (1-y} -x) Ni y M z O (2-k) F l ( although, M is, Co, Mg, Al, B , Ti, V, Cr, Fe, Cu , Zn, Zr, Mo, Sn, Ca, Sr and W, at least one element selected from the group consisting of 0.8 ≦ x ≦ 1.2, 0 <y <0.5, 0 ≦ z. A layered compound represented by ≦ 0.5, k + l <1, −0.1 ≦ k ≦ 0.2, 0 ≦ l ≦ 0.1), LiCo _1-x M _x O ₂ (where M is Al. , Mg, Ti, Zr, Fe, Ni, Cu, Zn, Ga, Ge, Nb, Mo, Sn, Sb and Ba, at least one element selected from the group consisting of 0 ≦ x ≦ 0.5. ), LiNi _1-x M _x O ₂ (where M is Al, Mg, Ti, Zr, Fe, Co, Cu, Zn, Ga, Ge, Nb, Mo, Sn. , Sb and Ba, at least one element selected from the group consisting of LiM _1-x N _x PO ₄ (where M is), a lithium nickel composite oxide represented by 0 ≦ x ≦ 0.5). , Fe, Mn and Co, at least one element selected from the group, N is Al, Mg, Ti, Zr, Ni, Cu, Zn, Ga, Ge, Nb, Mo, Sn, Sb and Ba. At least one element selected from the group consisting of, such as an olivine-type composite oxide represented by 0 ≦ x ≦ 0.5) and a lithium titanium composite oxide represented by Li ₄ Ti ₅ O _12. Only one of these may be used, or two or more thereof may be used in combination.

As the positive electrode solid electrolyte, a hydride-based solid electrolyte, a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or the like can be used, and only one of these may be used, or two or more thereof may be used in combination. Good. However, in order to improve the battery characteristics, it is desirable to contain a sulfide-based solid electrolyte.

Specific examples of the hydride-based solid electrolyte include a solid solution of LiBH ₄ , LIBH ₄ and the following alkali metal compound (for example, one having a molar ratio of LiBH ₄ to the alkali metal compound of 1: 1 to 20: 1). Can be mentioned. Examples of the alkali metal compound in the solid solution include lithium halide (LiI, LiBr, LiF, LiCl, etc.), rubidium halide (RbI, RbBr, RbiF, RbCl, etc.), and cesium halide (CsI, CsBr, CsF, CsCl, etc.). , At least one selected from the group consisting of lithium amide, rubidium amide and cesium amide.

Specific examples of the sulfide-based solid electrolyte include Li ₂ S-P ₂ S ₃ , Li ₂ S-P ₂ S ₅ , Li ₂ S-P ₂ S _3- P ₂ S ₅ , Li ₂ S-SiS ₂ , LiI-Li ₂ SP ₂ S ₅ , LiI-Li ₂ S-SiS _2- P ₂ S ₅ , Li ₂ S-SiS ₂ -Li ₄ SiO ₄ , Li ₂ S-SiS ₂ -Li ₃ PO ₄ , Li ₃ PS _4- Li ₄ GeS ₄ , Li _3.4 P _0.6 Si _0.4 S ₄ , Li _3.25 P _0.25 Ge _0.76 S ₄ , Li _4-x Ge _1-x P _x S ₄ , Li ₇ P ₃ S _{11 and the} like can be mentioned.

Specific examples of the oxide-based solid electrolyte include Li ₇ La ₃ Zr ₂ O ₁₂ , LiTi (PO ₄ ) ₃ , LiGe (PO ₄ ) ₃ , and LiLaTIO ₃ .

For the positive electrode, for example, a layer (positive electrode mixture layer) containing a positive electrode active material, a solid electrolyte, and a conductive additive or a binder added as needed is provided on one side of the current collector or. A structure formed on both sides or a molded body (positive electrode mixture molded body) obtained by pressure-molding the positive electrode mixture into pellets or the like can be used.

As the binder for the positive electrode, for example, a fluororesin such as polyvinylidene fluoride (PVDF) can be used. Further, as the conductive auxiliary agent for the positive electrode, for example, a carbon material such as carbon black can be used.

When a current collector is used for the positive electrode, a metal foil such as aluminum or stainless steel, a punching metal, a net, an expanded metal, a foamed metal; a carbon sheet; or the like can be used as the current collector.

In manufacturing a positive electrode, for example, in the case of a positive electrode having a current collector, the positive electrode active material, a solid electrolyte, and a conductive auxiliary agent and a binder added as needed are dispersed in a solvent such as xylene. The prepared positive electrode mixture-containing composition (paste, slurry, etc.) is applied to the current collector, dried, and if necessary, pressure-molded by calendering or the like to form a positive electrode on the surface of the current collector. A method of forming a layer of the agent (positive electrode mixture layer) can be adopted.

As the solvent used in the positive electrode mixture-containing composition, it is preferable to select a solvent that does not easily deteriorate the solid electrolyte. In particular, sulfide-based solid electrolytes and hydride-based solid electrolytes cause a chemical reaction with a very small amount of water, and are therefore represented by hydrocarbon solvents such as hexane, heptane, octane, nonane, decane, decalin, toluene, and xylene. It is preferable to use a non-polar aprotic solvent. In particular, it is more preferable to use a super dehydration solvent having a water content of 0.001% by mass (10 ppm) or less. In addition, fluorine-based solvents such as "Bertrel (registered trademark)" manufactured by Mitsui Dupont Fluorochemical, "Zeorolla (registered trademark)" manufactured by Nippon Zeon, and "Novec (registered trademark)" manufactured by Sumitomo 3M, as well as , Dichloromethane, diethyl ether and other non-aqueous organic solvents can also be used.

Further, in the case of a positive electrode composed of a molded body of a positive electrode mixture, a positive electrode mixture prepared by mixing a positive electrode active material, a solid electrolyte, a conductive auxiliary agent added as needed, a binder, and the like is used. It can be formed by compressing by pressure molding or the like.

The composition of the positive electrode mixture in the positive electrode is, for example, preferably the content of the positive electrode active material is 50 to 90% by mass, the content of the solid electrolyte is preferably 10 to 50% by mass, and the content of the binder. The amount is preferably 0.1 to 10% by mass. When the positive electrode mixture contains a conductive auxiliary agent, the content thereof is preferably 0.1 to 10% by mass. Further, the thickness of the positive electrode mixture layer and the thickness of the positive electrode mixture molded body in the positive electrode having the current collector are preferably 50 to 1000 μm.

As the negative electrode of the all-solid-state battery, a negative electrode active material used in a conventionally known lithium ion secondary battery, that is, a negative electrode containing an active material capable of occluding and releasing Li ions is used.

As the negative electrode active material, for example, lithium such as graphite, thermally decomposed carbons, cokes, glassy carbons, calcined organic polymer compounds, mesocarbon microbeads (MCMB), and carbon fibers can be stored and released. One or a mixture of two or more carbon-based materials is used. In addition, simple substances containing elements such as Si, Sn, Ge, Bi, Sb, and In, compounds and alloys thereof; compounds that can be charged and discharged at a low voltage close to that of lithium metals such as lithium-containing nitrides or lithium-containing oxides; lithium metals. Lithium / aluminum alloys; can also be used as the negative electrode active material.

For the negative electrode, a solid electrolyte, a binder such as butyl rubber, chloropyrene rubber, acrylic resin and fluororesin, and, if necessary, a conductive auxiliary agent (carbon material such as carbon black) are appropriately added to the negative electrode active material. The mixture is compressed by pressure molding to form a pellet-shaped molded body (negative electrode mixture molded body), or the current collector is used as a core material to form a molded body (negative electrode mixture layer). Alternatively, the above-mentioned various alloys or lithium metal foils can be used alone or laminated on a current collector as an active material layer.

When the negative electrode contains a solid electrolyte, one or more of the same solid electrolytes as those exemplified above can be used as the solid electrolyte. However, in order to improve the battery characteristics, it is desirable to contain a sulfide-based solid electrolyte.

When a current collector is used for the negative electrode, a copper or nickel foil, punching metal, net, expanded metal, foam metal; carbon sheet; or the like can be used as the current collector.

The negative electrode mixture-containing composition (paste, slurry, etc.) used in producing a negative electrode having a negative electrode mixture layer containing a negative electrode active material and a solid electrolyte is, for example, a negative electrode active material, a solid electrolyte, and a binder. And, if necessary, a conductive auxiliary agent to be used is dispersed in a solvent to prepare. In this case, the binder may be dissolved in the solvent.

As for the solvent used for the negative electrode mixture-containing composition, it is desirable to select a solvent that does not easily deteriorate the solid electrolyte, as with the solvent used for the positive electrode mixture-containing composition, and as the solvent for the positive electrode mixture-containing composition. It is preferable to use various solvents exemplified above, and it is particularly preferable to use a super-dehydrated solvent having a water content of 0.001% by mass (10 ppm) or less.

In the case of a molded body of a negative electrode mixture containing a negative electrode active material and a solid electrolyte, or a negative electrode having a negative electrode mixture layer (negative electrode mixture layer) on the surface of the current collector, the composition of the negative electrode mixture is, for example, The content of the negative electrode active material is preferably 50 to 80% by mass, the content of the solid electrolyte is preferably 20 to 50% by mass, and the content of the binder is 0.1 to 10% by mass. Is preferable. When the negative electrode mixture contains a conductive auxiliary agent, the content thereof is preferably 0.1 to 10% by mass. Further, the thickness of the negative electrode mixture layer and the thickness of the negative electrode mixture molded body in the negative electrode having the current collector are preferably 50 to 1000 μm.

The positive electrode and the negative electrode are used in an all-solid-state battery in the form of a laminated electrode body in which a solid electrolyte layer is interposed and laminated, or a wound electrode body in which the positive electrode body and the negative electrode body are further wound in a spiral shape.

As the solid electrolyte in the solid electrolyte layer of the all-solid-state battery, one or more of the same ones as those exemplified above can be used as the solid electrolyte of the positive electrode. However, in order to improve the battery characteristics, it is desirable to contain a sulfide-based solid electrolyte, and it is more desirable to contain the sulfide-based solid electrolyte in all of the positive electrode, the negative electrode and the solid electrolyte layer.

For the solid electrolyte layer, a composition for forming a solid electrolyte layer prepared by dispersing a solid electrolyte in a solvent is applied onto a base material, a positive electrode, and a negative electrode, dried, and if necessary, pressure molding such as press treatment is performed. It can be formed by doing.

As for the solvent used for the composition for forming the solid electrolyte layer, it is desirable to select a solvent that does not easily deteriorate the solid electrolyte, like the solvent used for the composition containing the positive electrode mixture, and the solvent for the composition containing the positive electrode mixture. It is preferable to use various solvents exemplified above, and it is particularly preferable to use a super-dehydrating solvent having a water content of 0.001% by mass (10 ppm) or less.

The thickness of the solid electrolyte layer is preferably 100 to 200 μm.

The all-solid-state battery of the present invention can be applied to the same applications as conventionally known secondary batteries, but has excellent heat resistance because it has a solid electrolyte instead of an organic electrolyte, and has a high temperature. It can be preferably used for applications that are exposed to.

Hereinafter, the present invention will be described in detail based on Examples. However, the following examples do not limit the present invention.

Example 1
<Preparation of positive electrode>
LiNi _0.6 Co _0.2 Mn _0.2 O ₂ with an average particle size of 3 μm, a sulfide solid electrolyte (Li ₆ PS ₅ Cl), and carbon nanotubes as a conductive aid [“VGCF” manufactured by Showa Denko Co., Ltd. (Product name)] was mixed at a mass ratio of 55:40: 5 and kneaded well to prepare a positive electrode mixture. Next, 90 mg of the positive electrode mixture was placed in a powder molding die having a diameter of 10 mm and pressure-molded using a press machine under the condition of 10 tons / cm ² , to prepare a positive electrode made of a positive electrode mixture molded body. ..

<Formation of solid electrolyte layer>
Next, 45 mg of the sulfide solid electrolyte was charged onto the positive electrode mixture molded body in the powder molding die, and pressure molding was performed using a press machine to perform pressure molding on the positive electrode mixture molded body. A solid electrolyte layer was formed in.

<Manufacturing of negative electrode>
Lithium titanate having an average particle diameter of 35 μm, the sulfide solid electrolyte, and graphite powder as a conductive auxiliary agent were mixed at a mass ratio of 55:40: 5 and kneaded well to prepare a negative electrode mixture. .. Next, the negative electrode mixture: 150 mg was put onto the solid electrolyte layer in the powder molding die, pressure molding was performed using a press machine, and the negative electrode mixture molded body was placed on the solid electrolyte layer. By forming the negative electrode, an electrode laminate in which the positive electrode, the solid electrolyte layer, and the negative electrode were laminated was produced.

<Battery assembly>
As a metal container for accommodating the electrode laminate, a stainless steel outer can and a sealing plate having gold-plated layers having a thickness of 0.1 μm formed on the inner surface and the outer surface were prepared. A nickel-plated layer having a thickness of 5 μm was formed on the outer can and the sealing plate as a base layer for the gold-plated layer.

Next, two carbon sheets having a thickness of 0.3 mm punched into a size of 10 mm in diameter are prepared, and a current collector is inserted between the outer can and the sealing plate and the electrode laminate, respectively. Used as.

After attaching a gasket made of polyphenylene sulfide to the sealing plate, one of the current collectors is arranged on the inner bottom surface of the sealing plate, and the electrode laminate is placed on the current collector so that the negative electrode is on the current collector side. And piled up. Further, another current collector was placed on the positive electrode of the electrode laminate and then covered with the outer can to seal the battery, thereby producing an all-solid-state battery having a coin-shaped shape.

Comparative Example 1
An all-solid-state battery was produced in the same manner as in Example 1 except that an outer can and a sealing plate having no gold-plated layer formed on either the inner surface or the outer surface were used as the metal container for accommodating the electrode laminate. did.

The charge / discharge cycles of the batteries of Example 1 and Comparative Example 1 were repeated under the following conditions in an environment of 100 ° C., and the discharge capacity was measured for each cycle.

Constant current charging is performed at a current value of 0.2 C until the voltage reaches 3.1 V, then constant voltage charging is performed at a voltage of 3.1 V until the current value reaches 0.02 C, and a current value of 0.2 C is performed. The charge / discharge cycle of constant current discharge until the voltage became 1.2 V was repeated for 200 cycles, and the cycle characteristics were evaluated by the ratio of the discharge capacity of the 200th cycle to the discharge capacity of the second cycle (capacity retention rate). The results are shown in Table 1.

In the battery of Comparative Example 1 in which the gold coating layer was not formed on the inner surface of the metal container, the internal resistance of the battery increased due to the corrosion of the inner surface of the metal container that progressed by repeating charging and discharging, and the discharge capacity increased. In contrast to the large decrease, the battery of Example 1 in which the gold coating layer was formed on the inner surface of the metal container suppressed the corrosion of the inner surface of the metal container even after repeated charging and discharging, and maintained a high discharge capacity. We were able to

1 All-solid-state battery 10 Positive electrode 20 Negative electrode 30 Solid electrolyte layer 40 Exterior can 50 Seal plate 51 Base material 52 Nickel layer (base layer)
53 Gold or platinum coating layer 60 Gasket

Claims (2)

An all-solid-state battery in which a power generation element including a positive electrode, a negative electrode, and a solid electrolyte layer interposed between the positive electrode and the negative electrode is housed inside a metal container.
At least one of the positive electrode, the negative electrode and the solid electrolyte layer contains a sulfide-based solid electrolyte.
An all-solid-state battery characterized in that a gold or platinum coating layer is formed on the inner surface of the metal container. The all-solid-state battery according to claim 1, wherein the thickness of the gold or platinum coating layer in the metal container is 0.05 μm or more.

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