Anode Material and Battery

Patent metadata

Field	Value
Publication number	US-2025149561-A1
Application number	US-202519018923-A
Country	US
Kind code	A1
Filing date	Jan 13, 2025
Priority date	Dec 21, 2023
Publication date	May 8, 2025
Grant date	—

Abstract

Provided are anode material and battery. The anode material includes a primary particle. The primary particle includes silicon grains. An average particle size of the silicon grains of the anode material measured at 25° C. is M 0 nm. After the anode material is heated to 1000° C. under nitrogen protection and then subjected to temperature holding for 1 h, the average particle size of the silicon grains of the anode material measured at a temperature naturally cooled to 25° C. is M1 nm. A crystallization instability degree of the anode material is F, where F=(M 1 -M 0 )/M 0 , M 1 >M 0 , and 0.01≤F≤500.

First claim

What is claimed is:

1 . An anode material, comprising a primary particle, wherein the primary particle comprises silicon grains;
an average particle size of the silicon grains of the anode material measured at 25° C. is M 0 nm; after the anode material is heated to 1000° C. under nitrogen protection and then subjected to temperature holding for 1 h, the average particle size of the silicon grains of the anode material measured at a temperature naturally cooled to 25° C. is M 1 nm; a crystallization instability degree of the anode material is F, wherein F=(M 1 -M 0 )/M 0 , M 1 >M 0 , and 0.01≤F≤500.

2 . The anode material according to claim 1 , meeting at least one of the following features:
(1) after the anode material is heated to 1000° C. at a heating rate of 5° C./min and then subjected to temperature holding for 1 h, the average particle size of the silicon grains of the anode material measured at the temperature naturally cooled to 25° C. is M1 nm, wherein 0.1<M 1 ≤50; (2) the average particle size of the silicon grains of the anode material measured at 25° C. is M0 nm, wherein 0.1≤M 0 ≤20.

3 . The anode material according to claim 1 , wherein an average particle size of the primary particles is 1 nm-100 nm.

4 . The anode material according to claim 1 , comprising a secondary particle, wherein the secondary particle comprises a matrix and the primary particle dispersed in the matrix.

5 . The anode material according to claim 4 , wherein the primary particle has pores, and at least part of the matrix is distributed in the pores of the primary particle.

6 . The anode material according to claim 4 , wherein the matrix comprises a carbon material, and the carbon material comprises at least one of amorphous carbon and graphitized carbon.

7 . The anode material according to claim 4 , further comprising a coating material located on at least partial surface of the secondary particle, wherein the coating material comprises at least one of an amorphous carbon material, a graphitized carbon material, and a polymer.

8 . The anode material according to claim 7 , wherein the coating material meets at least one of the following features:
(1) the coating material comprises the polymer, wherein the polymer comprises at least one of polyacrylic acid, polyacrylonitrile, polyimide, polyurethane, polydopamine, xanthan gum, polypyrrole, polythiophene, polyphenylacetylene, polyaniline, polyacetylene, and tannic acid; (2) the coating material comprises the polymer, and a thickness of a coating layer formed by the coating material is 50 nm-300 nm; (3) the coating material comprises the graphitized carbon material, and the thickness of the coating layer formed by the coating material is 5 nm-100 nm; (4) the coating material comprises the amorphous carbon material, and the thickness of the coating layer formed by the coating material is 10 nm-500 nm.

9 . The anode material according to claim 1 , meeting at least one of the following features:
(1) a mass content of carbon in the anode material is 5%-80%; (2) a mass content of oxygen in the anode material is less than 15%; (3) a mass content of silicon in the anode material is 40%-80%.

10 . The anode material according to claim 1 , wherein a pore volume of the anode material is 0.01 cm 3 /g−0.2 cm 3 /g.

11 . The anode material according to claim 1 , wherein a median particle size of the anode material is 0.5 μm-26 μm.

12 . The anode material according to claim 1 , wherein a specific surface area of the anode material is 0.8 m 2 /g−40 m 2 /g.

13 . The anode material according to claim 1 , wherein a powder tap density of the anode material is 0.3 g/cm 3 -1.3 g/cm 3 .

14 . The anode material according to claim 1 , wherein a powder compaction density of the anode material is 1.2 g/cm 3 -1.8 g/cm 3 .

15 . A battery, comprising the anode material according to claim 1 .

16 . The anode material according to claim 1 , wherein pores are formed on surfaces of the silicon grains through etching treatment.

17 . The anode material according to claim 7 , wherein a thickness of a coating layer formed by the coating material is 5 nm-500 nm.

18 . The anode material according to claim 7 , wherein the polymer include at least one of diblock copolymer, triblock copolymer, and multiblock copolymer.

Assignees

• Btr New Mat Group Co Ltd
• Dingyuan New Energy Tech Co Ltd

Inventors

• An Weili
• He Peng
• Ren Jianguo
• He Xueqin

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/625

  Carbon or graphite · CPC title