Positive electrode material and lithium ion battery

Patent metadata

Field	Value
Publication number	US-2019088938-A1
Application number	US-201816134914-A
Country	US
Kind code	A1
Filing date	Sep 18, 2018
Priority date	Sep 19, 2017
Publication date	Mar 21, 2019
Grant date	—

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 Li1+xCo1-yMyO2 or LiNiaCobN1-a-bO2, 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; 1/3≤a≤0.82, 0.1≤b≤1/3, 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 CeZrO4-z, wherein 0≤z<0.1. By using a positive electrode material coated with CeZrO4-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; 1/3≤a≤0.82, 0.1≤b≤1/3, 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 particle size corresponding to 50% of the volume distribution of the positive electrode material is 4 to 25 μm.

5 . The positive electrode material according to claim 1 , wherein the particle size corresponding to 50% of the volume distribution of the positive electrode material is 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 particle size corresponding to 50% of the volume distribution of the positive electrode material is 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; 1/3≤a≤0.82, 0.1≤b≤1/3, 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 particle size corresponding to 50% of the volume distribution of the positive electrode material is 4 to 25 μm.

13 . The positive electrode according to claim 9 , wherein the particle size corresponding to 50% of the volume distribution of the positive electrode material is 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 particle size corresponding to 50% of the volume distribution of the positive electrode material is 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

• H01M10/0525

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

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/505

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

• H01M2004/028

  Positive electrodes · CPC title