Sulfide solid electrolyte material, lithium solid-state battery, and method for producing sulfide solid electrolyte material

Patent metadata

Field	Value
Publication number	US-9484597-B2
Application number	US-201514832194-A
Country	US
Kind code	B2
Filing date	Aug 21, 2015
Priority date	Jul 6, 2011
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A sulfide solid electrolyte material contains glass ceramics that contains Li, A, X, and S, and has peaks at 2θ=20.2° and 23.6° in X-ray diffraction measurement with CuKα line. A is at least one kind of P, Si, Ge, Al, and B, and X is a halogen. A method for producing a sulfide solid electrolyte material includes amorphizing a raw material composition containing Li 2 S, a sulfide of A, and LiX to synthesize sulfide glass, and heating the sulfide glass at a heat treatment temperature equal to or more than a crystallization temperature thereof to synthesize glass ceramics having peaks at 2θ=20.2° and 23.6° in X-ray diffraction measurement with CuKα line, in which a ratio of the LiX contained in the raw material composition and the heat treatment temperature are controlled to obtain the glass ceramics.

First claim

The invention claimed is:

1. A method for producing a sulfide solid electrolyte material comprising:
amorphizing a raw material composition containing Li 2 S, a sulfide of A, and LiX to synthesize sulfide glass; and
heating the sulfide glass at a heat treatment temperature equal to or more than a crystallization temperature of the sulfide glass to synthesize glass ceramics having peaks at 2θ=20.2° and 23.6° in X-ray diffraction measurement with CuKα line,
wherein:
A is at least one element selected from the group consisting of P, Si, Ge, Al and B,
X is a halogen, and
a ratio of the LiX contained in the raw material composition and the heat treatment temperature are controlled to obtain the glass ceramics.

2. The method according to claim 1 , wherein a ratio of a peak intensity at 2θ=20.2° to a peak intensity at 2θ=21.0° is 1 or more.

3. The method according to claim 1 , wherein the sulfide solid electrolyte material does not contain cross-linked sulfur.

4. The method according to claim 1 , wherein:
the ratio of the LiX contained in the raw material composition is in a range of about 14% by mole to about 30% by mole, and
an upper limit of the heat treatment temperature is a temperature that allows the synthesis of the glass ceramics of about 200° C.

5. The method according to claim 1 , wherein the ratio of the LiX contained in the raw material composition is 14% by mole or more and less than 30% by mole, and the heat treatment temperature is less than 200° C.

6. The method according to claim 1 , wherein the heat treatment temperature is 170° C. or more.

7. The method according to claim 1 , wherein the heat treatment temperature is 190° C. or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ohtomo Takamasa
• Kawamoto Koji
• Hama Shigenori
• Kato Yuki

Classifications

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M2300/008

  Halides · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title