Method for producing sulfide solid electrolyte material

Patent metadata

Field	Value
Publication number	US-2018233775-A1
Application number	US-201815951734-A
Country	US
Kind code	A1
Filing date	Apr 12, 2018
Priority date	Jun 28, 2013
Publication date	Aug 16, 2018
Grant date	—

Abstract

A sulfide solid electrolyte material having high Li ion conductivity can be obtained by providing a method for producing a sulfide solid electrolyte material that has peaks at 2θ=20.2° and 2θ=23.6° in an X ray diffraction measurement using a CuKα ray, the method including steps of: an amorphizing step of obtaining sulfide glass by amorphization of a raw material composition that includes at least Li2S, P2S5, LiI and LiBr and a heat treatment step of heating the sulfide glass at a temperature of 195° C. or higher.

First claim

1 . A method for producing a sulfide solid electrolyte material that has peaks at 2θ=20.2° and 2θ=23.6° in an X ray diffraction measurement using a CuKα ray, the method comprising steps of:
an amorphizing step of obtaining sulfide glass by amorphization of a raw material composition that contains at least Li 2 S, P 2 S 5 , LiI and LiBr; and
a heat treatment step of heating the sulfide glass at a temperature of 195° C. or higher, wherein
a ratio of the LiBr relative to all the components in the raw material composition is equal to or more than 10 mol % and equal to or less than 20 mol %,
a ratio of the LiI relative to all the components in the raw material composition is equal to or more than 5 mol % and equal to or less than 20 mol %, and
a ratio of the Li 2 S relative to the total of the Li 2 S and the P 2 S 5 in the raw material composition is in the range of 70 mol % to 80 mol %.

2 . The method for producing a sulfide solid electrolyte material according to claim 1 , wherein the sulfide solid electrolyte material has no peaks at 2θ=21.0° and 28.0°.

3 . The method for producing a sulfide solid electrolyte material according to claim 1 , wherein a ratio of the LiI relative to all the components in the raw material composition is more than 5 mol % and less than 15 mol %.

Assignees

• Toyota Motor Co Ltd

Inventors

• Suzuki Tomoya
• Hama Shigenori
• Osada Naoki

Classifications

• C01B25/14

  Sulfur, selenium, or tellurium compounds of phosphorus · CPC title

• C03C4/18

  for ion-sensitive glass · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C03C3/323

  containing halogen, e.g. chalcohalide glasses · CPC title