Method for producing a sulfide solid electrolyte

Patent metadata

Field	Value
Publication number	US-2021075056-A1
Application number	US-201816619682-A
Country	US
Kind code	A1
Filing date	May 24, 2018
Priority date	Jun 9, 2017
Publication date	Mar 11, 2021
Grant date	—

Abstract

A method for producing a sulfide solid electrolyte comprising an argyrodite-type crystal structure, wherein phosphorus sulfide having a phosphorus content of 28.3 mass % or less and containing free sulfur is used as the raw material.

First claim

1 . A method for producing a sulfide solid electrolyte comprising an argyrodite-type crystal structure which comprises using phosphorus sulfide as the raw material, wherein the phosphorus sulfide has a phosphorus content of 28.3 mass % or less and contains free sulfur.

2 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide has a phosphorus content of 28.0 mass % or less.

3 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide has a phosphorus content of 27.7 mass % or less.

4 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide contains 0.2 to 2.5 mass % of free sulfur.

5 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus content is adjusted by mixing two or more phosphorus sulfides having different phosphorus contents.

6 . A method for producing a sulfide solid electrolyte comprising an argyrodite-type crystal structure, which comprises using the raw material obtained by adding elemental sulfur to phosphorus sulfide and adjusting a phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur to 28.3 mass % or less.

7 . The method for producing a sulfide solid electrolyte according to claim 6 , wherein the phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur is 28.0 mass % or less.

8 . The method for producing a sulfide solid electrolyte according to claim 6 , wherein the phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur is 27.7 mass % or less.

9 . The method for producing a sulfide solid electrolyte according to claim 6 , wherein the phosphorus sulfide does not contain free sulfur.

10 . The method for producing a sulfide solid electrolyte according to claim 1 , which comprises using lithium halides as the raw material.

11 . The method for producing a sulfide solid electrolyte according to claim 10 , which comprises using two or more types of lithium halide.

12 . The method for producing a sulfide solid electrolyte according to claim 1 , comprising a step of heat treatment under an inert gas atmosphere.

13 . The method for producing a sulfide solid electrolyte according to claim 12 , wherein the heat treatment is performed at 420 to 470° C.

14 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide contains 0.2 to 2.5 mass % of free sulfur and the phosphorus content is adjusted by mixing two or more phosphorus sulfides having different phosphorus contents.

15 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide contains 0.2 to 2.5 mass % of free sulfur, and comprises using the raw material obtained by adding elemental sulfur to phosphorus sulfide and adjusting a phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur to 28.3 mass % or less.

16 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide contains 0.2 to 2.5 mass % of free sulfur, and comprises using the raw material obtained by adding elemental sulfur to phosphorus sulfide and adjusting a phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur to 28.0 mass % or less.

17 . The method for producing a sulfide solid electrolyte according to claim 1 , wherein the phosphorus sulfide contains 0.2 to 2.5 mass % of free sulfur, and comprises using the raw material obtained by adding elemental sulfur to phosphorus sulfide and adjusting a phosphorus content based on the total mass of the phosphorus sulfide and the elemental sulfur to 27.7 mass % or less.

18 . The method for producing a sulfide solid electrolyte according to claim 1 , which comprises using lithium halides and the phosphorus sulfide containing 0.2 to 2.5 mass % of free sulfur as the raw material.

19 . The method for producing a sulfide solid electrolyte according to claim 1 , which comprises using two or more types of lithium halides and the phosphorus sulfide containing 0.2 to 2.5 mass % of free sulfur as the raw material.

Assignees

• Idemitsu Kosan Co

Inventors

• Nakata Akiko
• Maruyama Junpei
• Monoi Miki
• Hashimoto Ryohei

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• C01P2002/86

  by NMR- or ESR-data · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M10/0525

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

• C01P2006/40

  Electric properties · CPC title