Negative electrode active material, negative electrode, secondary battery, and method for preparing negative electrode active material

Patent metadata

Field	Value
Publication number	US-2024372074-A1
Application number	US-202418590909-A
Country	US
Kind code	A1
Filing date	Feb 28, 2024
Priority date	May 4, 2023
Publication date	Nov 7, 2024
Grant date	—

Abstract

The negative electrode active material contains: silicon-based particles; and silicon carbide distributed in the silicon-based particles. The content of the silicon carbide is about 0.1 parts by weight to 1 part by weight relative to the total of 100 parts by weight of the negative electrode active material.

First claim

What is claimed is:

1 . A negative electrode active material comprising:
silicon-based particles; and silicon carbide distributed in the silicon-based particles, wherein a content of the silicon carbide is about 0.1 parts by weight to 1 part by weight relative to a total of 100 parts by weight of the negative electrode active material.

2 . The negative electrode active material according to claim 1 , wherein the content of the silicon carbide is about 0.2 parts by weight to 0.8 parts by weight relative to the total of 100 parts by weight of the negative electrode active material.

3 . The negative electrode active material according to claim 1 , wherein in the silicon-based particles, a content of SiOx (x=0) is about 90 parts by weight or more relative to 100 parts by weight of the negative electrode active material.

4 . The negative electrode active material according to claim 1 , wherein in the silicon-based particles, a content of SiOx (0<x<2) is about 10 parts by weight or less relative to 100 parts by weight of the negative electrode active material.

5 . The negative electrode active material according to claim 1 , wherein a content of carbon is about 0.03 parts by weight to 0.3 parts by weight relative to the total of 100 parts by weight of the negative electrode active material.

6 . A negative electrode comprising the negative electrode active material according to claim 1 .

7 . The negative electrode according to claim 6 wherein a content of SiOx (x=0) is about 90 parts by weight or more relative to 100 parts by weight of the negative electrode active material.

8 . The negative electrode according to claim 7 , further comprising a negative electrode conductive material; and a negative electrode binder.

9 . A secondary battery comprising the negative electrode according to claim 6 .

10 . A method of preparing a negative electrode active material, wherein the negative electrode active material contains:
silicon-based particles; and silicon carbide distributed in the silicon-based particles, and a content of the silicon carbide is about 0.1 parts by weight to 1 part by weight relative to the total of 100 parts by weight of the negative electrode active material.

11 . The method according to claim 10 , wherein the content of the silicon carbide is about 0.2 parts by weight to 0.8 parts by weight relative to the total of 100 parts by weight of the negative electrode active material.

12 . The method according to claim 10 , wherein in the silicon-based particles, a content of SiOx (x=0) is about 90 parts by weight or more relative to 100 parts by weight of the negative electrode active material.

13 . The method according to claim 10 , wherein in the silicon-based particles, a content of SiOx (0<x<2) is about 10 parts by weight or less relative to 100 parts by weight of the negative electrode active material.

14 . The method according to claim 10 , wherein a content of carbon is about 0.03 parts by weight to 0.3 parts by weight relative to the total of 100 parts by weight of the negative electrode active material.

15 . A method of preparing a negative electrode active material, the method comprising:
reducing silicon dioxide to silicon through a reaction with carbon; and forming silicon carbide by using remaining carbon after the reduction.

16 . The method according to claim 15 , wherein in the forming of the silicon carbide, the silicon obtained through the reduction is cooled according to a preset cooling speed so as to form the silicon carbide.

17 . The method according to claim 16 , wherein the preset cooling speed is about 20° C./min to 70° C./min.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Sang Hyun
• Kim Donghyuk
• Lee Su Min
• Lee Yong Ju

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• C01B32/956

  Silicon carbide · CPC title