SOLID ELECTROLYTE MATERIAL, SOLID STATE BATTERY, AND METHOD FOR PRODUCING SOLID ELECTROLYTE MATERIAL

• US 20140127588A1
• Filed: 06/02/2011
• Published: 05/08/2014
• Est. Priority Date: 06/02/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Kato, Yuki, Hama, Shigenori, Otomo, Takamasa
• Granted Patent: US 9,337,509 B2
• Time in Patent Office: Days
• US Class Current: 429/304
• CPC Class Codes: H01B 1/122 Ionic conductors
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 2300/0088 Composites
• CPC Class Codes: H01M 2300/0094 in the form of layered products, e.g. coatings
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A main object of the present invention is to provide a solid electrolyte material having excellent electron conductivity. The present invention solves the problem by providing the solid electrolyte material including: a solid electrolyte particle; and a carbon coating layer formed on a surface of the solid electrolyte particle.

Claims

1. A solid electrolyte material comprising:

a solid electrolyte particle; and

a carbon coating layer formed on a surface of the solid electrolyte particle.

2. The solid electrolyte material according to claim 1, wherein the carbon coating layer is a layer with no grain boundary.

3. The solid electrolyte material according to claim 1, wherein the carbon coating layer is formed by carbonizing a liquid component.

4. The solid electrolyte material according to claim 1, wherein the solid electrolyte particle is a sulfide solid electrolyte particle.

5. The solid electrolyte material according to claim 1, wherein an electron conductivity of the solid electrolyte material is 1×

10<sup>−

3</sup> S/cm or higher.

6. A solid state battery comprising:

a cathode active material layer;

an anode active material layer; and

a solid electrolyte layer formed between the cathode active material layer and the anode active material layer,

wherein at least one of the cathode active material layer and the anode active material layer contains the solid electrolyte material according to claim 1.

7. A method for producing a solid electrolyte material comprising steps of:

a preparing step of preparing a solid electrolyte particle having a liquid component on its surface; and

a heating step of heating the solid electrolyte particle to carbonize the liquid component to form a carbon coating layer.