Method for manufacturing silicon clathrate electrode active material, and method for manufacturing lithium-ion battery

Patent metadata

Field	Value
Publication number	US-2024387809-A1
Application number	US-202418632926-A
Country	US
Kind code	A1
Filing date	Apr 11, 2024
Priority date	May 16, 2023
Publication date	Nov 21, 2024
Grant date	—

Abstract

The present disclosure provides a method for manufacturing a silicon clathrate electrode active material capable of improving the treatment efficiency of a sodium-containing silicon clathrate in a sodium removal step and capable of reducing the amount of sodium remaining in the obtained silicon clathrate electrode active material, and a method for manufacturing a lithium-ion battery comprising manufacturing such a silicon clathrate electrode active material. The method of the present disclosure for manufacturing a silicon clathrate electrode active material comprises (a) providing a sodium-containing silicon clathrate; and (b) contacting the sodium-containing silicon clathrate with a hydrogen fluoride solution to remove at least a portion of sodium from the sodium-containing silicon clathrate.

First claim

1 . A method for manufacturing a silicon clathrate electrode active material, comprising the following steps:
(a) providing a sodium-containing silicon clathrate; and (b) contacting the sodium-containing silicon clathrate with a hydrogen fluoride solution to remove at least a portion of sodium from the sodium-containing silicon clathrate.

2 . The method according to claim 1 , wherein the solvent of the hydrogen fluoride solution is a mixed solvent of water and an organic solvent.

3 . The method according to claim 1 , wherein the sodium-containing silicon clathrate has a porous structure.

4 . The method according to claim 1 , wherein the silicon clathrate electrode active material is for a negative electrode active material of lithium-ion batteries.

5 . A method for manufacturing a lithium-ion battery, comprising the following steps
manufacturing a silicone clathrate electrode active material by the method according to claim 1 , and forming an electrode active material layer containing the silicon clathrate electrode active material.

Assignees

• Toyota Motor Co Ltd

Inventors

• Mashimo Naohiro
• Otaki Mitsutoshi
• Yoshida Jun

Classifications

• C23F1/44

  Compositions for etching metallic material from a metallic material substrate of different composition · CPC title

• C23F1/30

  for etching other metallic material · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0525 Primary

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

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title