Sulfide-based solid electrolyte for lithium ion batteries

Patent metadata

Field	Value
Publication number	US-9899701-B2
Application number	US-201515326238-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Jul 16, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

Proposed is a new sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte relating to a compound that has a cubic argyrodite type crystal structure and is represented by Li 7-x-2y PS 6-x-y Cl x , and having excellent water resistance and oxidation resistance. Proposed is a sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte containing a compound that has a cubic argyrodite type crystal structure and is represented by compositional formula (1): Li 7-x-2y PS 6-x-y Cl x , in which compositional formula, conditions: 0.8≦x≦1.7 and 0<y≦−0.25x+0.5 are satisfied.

First claim

The invention claimed is:

1. A sulfide-based solid electrolyte for lithium ion batteries comprising a compound having a cubic argyrodite type crystal structure, wherein the compound is represented by compositional formula (1): Li 7-x-2y PS 6-x-y Cl x , and in the compositional formula (1), conditions: 0.8≦x≦1.7 and 0<y≦−0.25x+0.5 are satisfied.

2. The sulfide-based solid electrolyte for lithium ion batteries according to claim 1 , wherein in the compositional formula (1), conditions: 1.0≦x≦1.4 and 0<y≦−0.2x+0.4 are further satisfied.

3. The sulfide-based solid electrolyte for lithium ion batteries according to claim 1 , wherein in the compositional formula (1), condition: 0.15≧[y/(2−x)] is further satisfied.

4. The sulfide-based solid electrolyte for lithium ion batteries according to claim 1 , wherein the sulfide-based solid electrolyte is obtained by mixing a lithium sulfide (Li 2 S) powder, a phosphorus sulfide (P 2 S 5 ) powder, and a lithium chloride (LiCl) powder, and calcining the mixture at 350° C. to 500° C. in an inert atmosphere, or calcining the mixture at 350° C. to 650° C. in an atmosphere containing hydrogen sulfide gas.

5. A lithium ion battery comprising the solid electrolyte according to claim 1 .

6. A lithium ion battery comprising a negative electrode active material containing the solid electrolyte according to claim 1 and carbon.

7. The sulfide-based solid electrolyte for lithium ion batteries according to claim 2 , wherein in the compositional formula (1), condition: 0.15≧[y/(2−x)] is further satisfied.

8. The sulfide-based solid electrolyte for lithium ion batteries according to claim 2 , wherein the sulfide-based solid electrolyte is obtained by mixing a lithium sulfide (Li 2 S) powder, a phosphorus sulfide (P 2 S 5 ) powder, and a lithium chloride (LiCl) powder, and calcining the mixture at 350° C. to 500° C. in an inert atmosphere, or calcining the mixture at 350° C. to 650° C. in an atmosphere containing hydrogen sulfide gas.

9. The sulfide-based solid electrolyte for lithium ion batteries according to claim 3 , wherein the sulfide-based solid electrolyte is obtained by mixing a lithium sulfide (Li 2 S) powder, a phosphorus sulfide (P 2 S 5 ) powder, and a lithium chloride (LiCl) powder, and calcining the mixture at 350° C. to 500° C. in an inert atmosphere, or calcining the mixture at 350° C. to 650° C. in an atmosphere containing hydrogen sulfide gas.

10. A lithium ion battery comprising the solid electrolyte according to claim 2 .

11. A lithium ion battery comprising the solid electrolyte according to claim 3 .

12. A lithium ion battery comprising the solid electrolyte according to claim 4 .

13. A lithium ion battery comprising a negative electrode active material containing the solid electrolyte according to claim 2 and carbon.

14. A lithium ion battery comprising a negative electrode active material containing the solid electrolyte according to claim 3 and carbon.

15. A lithium ion battery comprising a negative electrode active material containing the solid electrolyte according to claim 4 and carbon.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Miyashita Norihiko
• Chikumoto Takashi
• Matsushima Hideaki
• Matsuzaki Kenji

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01P2002/30

  Three-dimensional structures · CPC title

• H01B1/06

  mainly consisting of other non-metallic substances · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01B1/10

  sulfides · CPC title