# US 2014/0154584 A1 · Sulfide-based solid battery

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- Number: US 2014/0154584 A1
- Document ID: US20140154584A1
- Status: Published application
- Kind: A1
- Application number: 14/236,798
- Filed: 2012-07-27
- Published: 2014-06-05
- Earliest claimed: 2011-08-11
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroshi Nagase; Norihiro Ose; Hajime Hasegawa
- Web page: https://patentgrep.com/patent/US20140154584A1

## CPC

- H01M 10/05: Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence)
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/0562: Solid materials
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 10/052: Li-accumulators
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- 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 object of the present invention is to provide a sulfide-based solid battery which has high charge-discharge capacity especially under high current density conditions. Disclosed is a sulfide-based solid battery including a positive electrode, a negative electrode and a sulfide-based solid electrolyte layer, the sulfide-based solid electrolyte layer being present between the positive electrode and the negative electrode, wherein the negative electrode includes at least a negative electrode active material layer; wherein the negative electrode active material layer includes negative electrode active material fine particles and sulfide-based solid electrolyte fine particles; and wherein the ratio of average particle diameter ra of the negative electrode active material fine particles to average particle diameter rs of the sulfide-based solid electrolyte fine particles (ra/rs) is 2.0 or more.

## Claims

### Claim 1

A sulfide-based solid battery comprising a positive electrode, a negative electrode and a sulfide-based solid electrolyte layer, the sulfide-based solid electrolyte layer being present between the positive electrode and the negative electrode,
wherein the negative electrode comprises at least a negative electrode active material layer;
wherein the negative electrode active material layer comprises negative electrode active material fine particles and sulfide-based solid electrolyte fine particles; and
wherein the ratio of average particle diameter ra of the negative electrode active material fine particles to average particle diameter rs of the sulfide-based solid electrolyte fine particles (ra/rs) is 2.0 or more;
wherein the average particle diameter ra of the negative electrode active material fine particles is 50 μm or less; and
wherein the battery is charged at a current density of 1 C or more.

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The sulfide-based solid battery according to claim 1, wherein the average particle diameter rs of the sulfide-based solid electrolyte fine particles is 0.8 μm or more.

### Claim 4

(canceled)

### Claim 5 (depends on 1)

The sulfide-based solid battery according to claim 1, wherein the ratio of average particle diameter ra of the negative electrode active material fine particles to average particle diameter rs of the sulfide-based solid electrolyte fine particles (ra/rs) is 15 or less.

### Claim 6 (depends on 1)

The sulfide-based solid battery according to claim 1, wherein the average particle diameter ra of the negative electrode active material fine particles is 0.1 μm or more.

### Claim 7 (depends on 1)

The sulfide-based solid battery according to claim 1, wherein the average particle diameter rs of the sulfide-based solid electrolyte fine particles is 10 μm or less.