ALL-SOLID-STATE BATTERY

• US 20100273062A1
• Filed: 04/27/2010
• Published: 10/28/2010
• Est. Priority Date: 04/28/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nagase, Hiroshi, Tsuchida, Yasushi, Hama, Shigenori, Ueno, Yukiyoshi, Kamiya, Masato
• Granted Patent: US 8,557,445 B2
• Time in Patent Office: Days
• US Class Current: 429/304
• 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 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 6/18 with solid electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An all-solid-state battery includes: a positive electrode active material layer that contains a positive electrode active material, and a first sulfide solid electrolyte material that contacts the positive electrode active material and that substantially does not have a cross-linking chalcogen; a negative electrode active material layer containing a negative electrode active material; and a solid electrolyte layer that is provided between the positive electrode active material layer and the negative electrode active material layer, and that contains a second sulfide solid electrolyte material that substantially has a cross-linking chalcogen.

Claims

1. An all-solid-state battery comprising:

a positive electrode active material layer that includes a positive electrode active material, and a first sulfide solid electrolyte material that contacts the positive electrode active material and that substantially does not have a cross-linking chalcogen;

a negative electrode active material layer containing a negative electrode active material; and

a solid electrolyte layer that is provided between the positive electrode active material layer and the negative electrode active material layer, and that contains a second sulfide solid electrolyte material that substantially has a cross-linking chalcogen.

2. The all-solid-state battery according to claim 1, wherein the cross-linking chalcogen of the first sulfide solid electrolyte material and the cross-linking chalcogen of the second sulfide solid electrolyte material are cross-linking sulfur.

3. The all-solid-state battery according to claim 1, wherein the first sulfide solid electrolyte material is a sulfide of P or Ge.

4. The all-solid-state battery according to claim 1, wherein the positive electrode active material is an oxide positive electrode active material.

5. The all-solid-state battery according to claim 1, wherein the positive electrode active material is coated with a Li ion conductive oxide.

6. The all-solid-state battery according to claim 5, wherein the Li ion conductive oxide is LiNbO₃.

7. The all-solid-state battery according to claim 1, wherein proportion of the cross-linking chalcogen contained in the first sulfide solid electrolyte material is less than or equal to 10 mol %.

8. The all-solid-state battery according to claim 1, wherein proportion of the cross-linking chalcogen contained in the second sulfide solid electrolyte material is greater than or equal to 20 mol %.

9. The all-solid-state battery according to claim 1, wherein amount of the first sulfide solid electrolyte material contained in a surface of a side of the positive electrode active material layer where the positive electrode active material layer contacts the solid electrolyte layer is greater than amount of the first sulfide solid electrolyte material contained in a portion of the positive electrode active material layer where the positive electrode active material layer does not contact the solid electrolyte layer.

10. The all-solid-state battery according to claim 1, wherein the positive electrode active material layer has a thin-film layer that consists only of the first sulfide solid electrolyte material, on a surface of a side of the positive electrode active material layer where the positive electrode active material layer contacts the solid electrolyte layer contacts.

11. The all-solid-state battery according to claim 1, wherein the second sulfide solid electrolyte material has higher Li ion conductivity than the first sulfide solid electrolyte material.