Method for producing sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-9640837-B2
Application number	US-201615167033-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	Jun 29, 2015
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The present invention is to provide a method for producing such a sulfide solid electrolyte that it has high lithium ion conductivity and the total amount of heat generated by the reaction with the charged anode material that proceeds at around 315° C., is reduced. Disclosed is a method for producing a sulfide solid electrolyte, wherein the method includes: a first step of preparing Li 3 PS 4 having a γ structure, and a second step in which a second step mixture that contains the Li 3 PS 4 having the γ structure obtained in the first step and LiX (where X is halogen) is non-crystallized, and the non-crystallized second step mixture is heated in a temperature range of more than 150° C. and less than 190° C.

First claim

The invention claimed is:

1. A method for producing a sulfide solid electrolyte, wherein the method comprises:
a first step of preparing Li 3 PS 4 having a γ structure, and
a second step in which a second step mixture that contains the Li 3 PS 4 having the γ structure obtained in the first step and LiX (where X is halogen) is non-crystallized, and the non-crystallized second step mixture is heated in a temperature range of more than 150° C. and less than 190° C.

2. The method for producing the sulfide solid electrolyte according to claim 1 , wherein, in the first step, the Li 3 PS 4 having the γ structure is obtained by non-crystallizing a first step mixture that contains Li 2 S and P 2 S 5 in a molar ratio range of 74:26 to 76:24, and crystallizing the non-crystallized first step mixture by heating.

3. The method for producing the sulfide solid electrolyte according to claim 2 , wherein, in the first step, a content of LiX in the first step mixture is less than 5.26% by mole with respect to a total amount of the Li 2 S and P 2 S 5 therein.

4. The method for producing the sulfide solid electrolyte according to claim 1 , wherein the sulfide solid electrolyte has peaks at 2θ=20°, 24° and 30° in X-ray diffraction measurement with CuKα radiation.

5. The method for producing the sulfide solid electrolyte according to claim 1 , wherein, in the second step, the second step mixture is non-crystallized by mechanical milling.

Assignees

• Toyota Motor Co Ltd

Inventors

• Doi Takayoshi

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title