# US 10,770,723 B2 · Positive electrode material and lithium ion battery

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- Number: US 10,770,723 B2
- Document ID: US10770723B2
- Status: Granted
- Kind: B2
- Application number: 16/134,914
- Filed: 2018-09-18
- Published: 2019-03-21
- Granted: 2020-09-08
- Earliest claimed: 2017-09-19
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Chunfeng Zheng; Leimin Xu
- Web page: https://patentgrep.com/patent/US10770723B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/624: {Electric conductive fillers}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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; 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 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.

## Claims

### Claim 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 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 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 CeZrO4−z, wherein 0≤z<0.1.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 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 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 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 CeZrO4−z, wherein 0≤z<0.1.

### Claim 10 (depends on 9)

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.

### Claim 11 (depends on 9)

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

### Claim 12 (depends on 9)

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.

### Claim 13 (depends on 9)

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.

### Claim 14 (depends on 9)

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

### Claim 15 (depends on 9)

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.

### Claim 16 (depends on 9)

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.

### Claim 17 (depends on 9)

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