Positive electrode material and lithium ion battery

Patent metadata

Field	Value
Publication number	US-10770723-B2
Application number	US-201816134914-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Sep 19, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The examples of the present application provide a positive electrode material and a lithium ion battery. The positive electrode material comprises: a substrate material; and a coating material formed on at least one portion of the surface of the substrate material; the general formula of the substrate material being Li 1+x Co 1-y M y O 2 or LiNi a Co b N 1-a-b O 2 , wherein 0≤x<0.1, 0≤y<0.1 and M is at least one of selected from the group of Mn, Ni, Al, Mg, Ti, Zr, Y, P, Cr; ⅓≤a≤0.82, 0.1≤b≤⅓, 0.6≤a+b, N is at least one of selected from the group of Mn, Al, Mg, Ti, Zr, La, Ce, Y; the coating material includes CeZrO 4-z , wherein 0≤z<0.1. By using a positive electrode material coated with CeZrO 4-z , the direct current (DC) resistance of the lithium ion battery is greatly reduced.

First claim

What is claimed is:

1. A positive electrode material, comprising:
a substrate material; and
a coating material formed on at least one portion of the surface of the substrate material;
the general formula of the substrate material being Li 1+x Co 1−y M y O 2 or LiNi a Co b N 1−a−b O 2 , wherein 0≤x<0.1, 0≤y<0.1 and M is at least one of selected from the group of Mn, Ni, Al, Mg, Ti, Zr, Y, P and Cr; ⅓≤a≤0.82, 0.1≤b ≤⅓, 0.6≤a+b, N is at least one of selected from the group of Mn, Al, Mg, Ti, Zr, La, Ce and Y;
the coating material includes CeZrO 4−z , wherein 0≤z<0.1.

2. The positive electrode material according to claim 1 , wherein the coating material accounts for 0.04% to 1% of the total mass of the positive electrode material.

3. The positive electrode material according to claim 1 , wherein the coating material accounts for 0.1% of the total mass of the positive electrode material.

4. The positive electrode material according to claim 1 , wherein the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 4 to 25 μm.

5. The positive electrode material according to claim 1 , wherein the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 15 μm.

6. The positive electrode material according to claim 1 , wherein 0<y<0.1.

7. The positive electrode material according to claim 1 , wherein a coating layer formed of the coating material has a tetragonal phase structure, and the Ce atoms are in a gradient distribution.

8. The positive electrode material according to claim 1 , wherein both x and y are 0, the coating material accounts for 0.1% of the total mass of the positive electrode material, and the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 15 μm.

9. A positive electrode, comprising:
a positive current collector; and
a positive active material arranged on the positive current collector;
characterized in that the positive active material includes a positive electrode material;
wherein the positive electrode material comprises:
a substrate material; and
a coating material formed on at least one portion of the surface of the substrate material; the general formula of the substrate material being Li 1+x Co 1−y M y O 2 or LiNi a Co b N 1−a−b O 2 , wherein 0≤x<0.1, 0≤y<0.1 and M is at least one of selected from the group of Mn, Ni, Al, Mg, Ti, Zr, Y, P and Cr; ⅓≤a≤0.82, 0.1≤b≤⅓, 0.6≤a+b, N is selected from at least one of Mn, Al, Mg, Ti, Zr, La, Ce and Y; the coating material includes CeZrO 4−z , wherein 0≤z<0.1.

10. The positive electrode according to claim 9 , wherein the coating material accounts for 0.04% to 1% of the total mass of the positive electrode material.

11. The positive electrode according to claim 9 , wherein the coating material accounts for 0.1% of the total mass of the positive electrode material.

12. The positive electrode according to claim 9 , wherein the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 4 to 25 μm.

13. The positive electrode according to claim 9 , wherein the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 15 μm.

14. The positive electrode according to claim 9 , wherein 0<y<0.1.

15. The positive electrode according to claim 9 , wherein a coating layer formed of the coating material has a tetragonal phase structure, and the Ce atoms are in a gradient distribution.

16. The positive electrode according to claim 9 , wherein both x and y are 0, the coating material accounts for 0.1% of the total mass of the positive electrode material, and the substrate material formed with the coating material has the particle size, which corresponds to 50% of the volume distribution of the positive electrode material, of 15 μm.

17. A lithium ion battery, characterized by comprising the positive electrode according to claim 9 .

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zheng Chunfeng
• Xu Leimin

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title