# US 2025/0167293 A1 · All-solid-state battery

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- Number: US 2025/0167293 A1
- Document ID: US20250167293A1
- Status: Published application
- Kind: A1
- Application number: 18/839,482
- Filed: 2022-09-28
- Published: 2025-05-22
- Earliest claimed: 2022-02-28
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Hiroshi SATO; Tomoko NAKAMURA; Shota SUZUKI; Ayaka NAGATOMI
- Web page: https://patentgrep.com/patent/US20250167293A1

## CPC

- H01B 1/08: oxides
- H01M 10/0562: Solid materials
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 4/38: of elements or alloys
- H01M 4/405: {Alloys based on lithium}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/662: {Alloys (collectors of lead alloys H01M4/685)}
- H01M 4/664: {Ceramic materials}
- H01M 4/666: {in the form of mixed materials (H01M4/668 takes precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0068: inorganic
- H01M 2300/0071: Oxides
- Y02E 60/10: Energy storage using batteries
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An all-solid-state battery according to the present embodiment includes a sintered body having a positive electrode, a negative electrode and a solid electrolyte layer disposed between the positive electrode and the negative electrode, the solid electrolyte contains a solid electrolyte having a γ-Li3PO4-type crystal structure, and the negative electrode has a layer containing a metal composed of Ag or a Li—Ag alloy and a compound represented by LiαTi5O12 (4≤α≤7).

## Claims

### Claim 1

An all-solid-state battery comprising:
a sintered body having a positive electrode, a negative electrode and a solid electrolyte layer disposed between the positive electrode and the negative electrode,
wherein the solid electrolyte contains a solid electrolyte having a γ-Li3PO4-type crystal structure, and
the negative electrode has a layer containing a metal composed of Ag or a Li—Ag alloy and a compound represented by LiαTi5O12 (4≤α≤7).

### Claim 2 (depends on 1)

The all-solid-state battery according to claim 1,
wherein the negative electrode includes a first layer and a second layer,
the first layer is the layer containing a metal composed of Ag or a Li—Ag alloy,
the second layer is in contact with at least one main surface of the first layer, and
the second layer contains a compound represented by LiαTi5O12 (4≤α≤7).

### Claim 3 (depends on 2)

The all-solid-state battery according to claim 2,
wherein an average thickness of the second layer is 1 μm or more and 4 μm or less.

### Claim 4 (depends on 2)

The all-solid-state battery according to claim 2,
wherein the first layer has a layer containing a Li—Ag alloy.

### Claim 5 (depends on 2)

The all-solid-state battery according to claim 2,
wherein the first layer contains a compound represented by LiαTi5O12 (4≤α≤7).

### Claim 6 (depends on 2)

The all-solid-state battery according to claim 2,
wherein a total volume percent of the metal composed of Ag and the Li—Ag alloy in the first layer is 45% or more and 90% or less.

### Claim 7 (depends on 1)

The all-solid-state battery according to claim 1,
wherein the solid electrolyte contains Li3+xSixP1-xO4 (0.2≤x≤0.6).

### Claim 8 (depends on 1)

The all-solid-state battery according to claim 1,
wherein the positive electrode contains lithium cobaltate.

### Claim 9 (depends on 1)

The all-solid-state battery according to claim 1,
wherein the positive electrode includes a third layer containing Ag and a fourth layer in contact with at least one main surface of the third layer.