Positive electrode active material composition, positive electrode plate, battery, and electric apparatus

Patent metadata

Field	Value
Publication number	US-12456722-B2
Application number	US-202519210797-A
Country	US
Kind code	B2
Filing date	May 16, 2025
Priority date	Mar 24, 2023
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A positive electrode active material composition, a positive electrode plate, a battery, and an electric apparatus are described. The positive electrode active material composition includes a first positive electrode active material and a second positive electrode active material, where the first positive electrode active material includes a core Li a A b Mn f B 1-f P 1-d R d O 4-n D n and a coating layer covering the core. The coating layer comprises one or more of pyrophosphate, phosphate, and carbon. The second positive electrode active material includes a compound LiNi x Co y M 1-x-y O 2 ; and 0.018m+0.003f≤z≤0.02m+0.02f is satisfied.

First claim

The invention claimed is:

1. A positive electrode active material composition comprising a first positive electrode active material and a second positive electrode active material, wherein
the first positive electrode active material comprises a core and a coating layer covering the core; the coating layer comprises one or more of pyrophosphate, phosphate, and carbon; and the core comprises a compound Li a A b Mn f B 1-f P 1-d R d O 4-n D n , wherein
A comprises one or more elements of Zn, Al, Na, K, Mg, Nb, Mo, and W;
B comprises one or more elements of Ti, V, Zr, Fe, Ni, Mg, Co, Ga, Sn, Sb, Nb, and Ge;
R comprises one or more elements of B (boron), S, Si, and N;
D comprises one or more elements of S, F, Cl, and Br;
a is 0.9 to 1.1; b is 0 to 0.1; f is 0.1 to 0.999; d is 0 to 0.11; and n is 0 to 0.1;
the second positive electrode active material comprises a compound LiNi x Co y M 1-x-y O 2 , wherein M comprises one or more elements of Al, Mn, Mg, Nb, Ti, and Ba; 0.5≤x≤0.69; and 0<y<0.31;
and
0.018m+0.003f≤z≤0.02m+0.02f is satisfied,
wherein
m represents a mass percentage of the first positive electrode active material in the positive electrode active material composition; and
z represents a ratio of a coating layer thickness to a particle size D v 50 of the first positive electrode active material.

2. The positive electrode active material composition according to claim 1 , wherein the coating layer thickness of the first positive electrode active material is 2-15 nm.

3. The positive electrode active material composition according to claim 1 , wherein the particle size D v 50 of the first positive electrode active material is 400-1600 nm.

4. The positive electrode active material composition according to claim 1 , wherein f is 0.3 to 0.8.

5. The positive electrode active material composition according to claim 1 , wherein the coating layer of the first positive electrode active material comprises carbon.

6. The positive electrode active material composition according to claim 1 , wherein m is 30%-80%.

7. A positive electrode plate comprising a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer comprises the positive electrode active material composition according to claim 1 .

8. A positive electrode plate comprising a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material; at least one positive electrode film layer has a multi-layer structure; different layers of the at least one positive electrode film layer with the multi-layer structure respectively comprise a first positive electrode active material and a second positive electrode active material; and the first positive electrode active material and the second positive electrode active material according to claim 1 ;
and
0.018m′+0.003f≤z≤0.02m′+0.02f is satisfied,
wherein
m′ represents a mass percentage of the first positive electrode active material in the positive electrode active material;
z represents a ratio of a coating layer thickness to a particle size D v 50 of the first positive electrode active material.

9. The positive electrode plate according to claim 8 , wherein m′ is 30%-80%.

10. A battery comprising the positive electrode active material composition according to claim 1 .

11. A battery comprising the positive electrode plate according to claim 7 .

12. An electric apparatus comprising the positive electrode active material composition according to claim 1 .

13. An electric apparatus comprising the positive electrode plate according to claim 7 .

14. An electric apparatus comprising the battery according to claim 10 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Pan Jianfu
• Xu Xiaofu
• Shang Yibo
• Qin Yiming
• Zhang Xinyu
• Pei Renjie
• He Jianfu
• Liu Qian
• Ye Yonghuang

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/582

  Halogenides · CPC title