Alkali metal halide production method, and sulfide solid electrolyte production method

Patent metadata

Field	Value
Publication number	US-10910669-B2
Application number	US-201716084131-A
Country	US
Kind code	B2
Filing date	Mar 14, 2017
Priority date	Mar 14, 2016
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

Provided is a method for producing an alkali metal halide, including causing a reaction of an alkali metal sulfide and a substance represented by the following general formula (1) in the absence of a solvent or in a solvent except for water: X2 (1), wherein X represents a halogen element.

First claim

The invention claimed is:

1. A method for producing a mixture of an alkali metal halide and an alkali metal sulfide, comprising causing a reaction of an alkali metal sulfide and a substance of the following formula (1) in a solvent excluding water in order to produce the alkali metal halide in mixture with an excess of alkali metal sulfide that remains unreacted and wherein the amount of the excess of alkali metal sulfide that remains unreacted in the mixture is from 4 to 8 times based on molar ratio of the substance represented by the formula (1):
X2 (1)

wherein X represents a halogen element.

2. The method according to claim 1 , comprising causing the reaction using a grinding machine.

3. The method according to claim 2 , wherein the grinding machine is a bead mill or a ball mill.

4. The method according to claim 1 , comprising causing the reaction in wherein the solvent is toluene.

5. The method according to claim 1 , comprising causing the reaction in a solvent in which the solubility of the alkali metal sulfide is 1% by mass or less.

6. The method according to claim 5 , wherein the solvent is a hydrocarbon.

7. The method according to claim 5 , wherein the solvent is an aromatic hydrocarbon.

8. The method according to claim 1 , wherein the alkali metal sulfide is at least one selected from lithium sulfide and sodium sulfide.

9. The method according to claim 1 , wherein the substance is at least one selected from bromine and iodine.

10. A method for producing a sulfide-based solid electrolyte, comprising producing a sulfide-based solid electrolyte using a mixture of alkali metal halide and alkali metal sulfide produced by causing a reaction of an alkali metal sulfide and a substance of the following formula (1) in a solvent excluding water in order to produce the alkali metal halide in mixture with an excess of alkali metal sulfide that remains unreacted and wherein the amount of the excess of alkali metal sulfide that remains unreacted in the mixture is from 4 to 8 times based on molar ratio of the substance represented by the formula (1):
X2 (1)

wherein X represents a halogen element.

11. A method for producing a sulfide-based solid electrolyte according to claim 10 , wherein the mixture of alkali metal halide and alkali metal sulfide comprises a lithium compound and a phosphorus compound, and the resulting electrolyte comprises a lithium compound and a phosphorus compound.

12. The method according to claim 1 , wherein the mixture of an alkali metal halide and an alkali metal sulfide produced is a slurry of solid alkali metal halide and solid alkali metal sulfide in the solvent.

Assignees

• Idemitsu Kosan Co

Inventors

• Makino Takeshi

Classifications

• H01M2300/0091

  in the form of mixtures · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C01D15/04 Primary

  Halides · CPC title

• H01B1/10

  sulfides · CPC title

• H01M10/0525

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