# US 2021/0280902 A1 · Solid Electrolyte, Method For Producing Solid Electrolyte, And Composite Body

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- Number: US 2021/0280902 A1
- Document ID: US20210280902A1
- Status: Published application
- Kind: A1
- Application number: 17/194,444
- Filed: 2021-03-08
- Published: 2021-09-09
- Earliest claimed: 2020-03-09
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hitoshi YAMAMOTO; Tsutomu TERAOKA; Tomofumi YOKOYAMA
- Web page: https://patentgrep.com/patent/US20210280902A1

## CPC

- H01M 10/0562: Solid materials
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2300/0068: inorganic
- H01M 2300/0071: Oxides
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A solid electrolyte according to the present disclosure is represented by the following compositional formula (1). Li7-x+y(La3-ySry)(Zr2-xMx)O12 (1) In the formula (1), x and y satisfy 0.20≤x<1.50 and 0.00<y<0.30, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

## Claims

### Claim 1

A solid electrolyte, represented by the following compositional formula (1):
Li7-x+y(La3-ySry)(Zr2-xMx)O12 (1)
wherein x and y satisfy 0.20≤x<1.50 and 0.00<y<0.30, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

### Claim 2

A method for producing a solid electrolyte comprising:
a mixing step of mixing multiple types of raw materials containing metal elements included in the following compositional formula (1), thereby obtaining a mixture;
a first heating step of subjecting the mixture to a first heating treatment thereby forming a calcined body; and
a second heating step of subjecting the calcined body to a second heating treatment thereby forming a crystalline solid electrolyte represented by the following compositional formula (1):
Li7-x+y(La3-ySry)(Zr2-xMx)O12 (1)
wherein x and y satisfy 0.20≤x<1.50 and 0.00<y<0.30, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

### Claim 3 (depends on 2)

The method for producing a solid electrolyte according to claim 2, wherein a heating temperature in the first heating step is 500° C. or higher and 650° C. or lower.

### Claim 4 (depends on 2)

The method for producing a solid electrolyte according to claim 2, wherein a heating temperature in the second heating step is 800° C. or higher and 1000° C. or lower.

### Claim 5 (depends on 1)

A composite body, comprising:
an active material; and
the solid electrolyte according to claim 1 that coats a part of a surface of the active material.