# US 2019/0356015 A1 · Lithium ion battery

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- Number: US 2019/0356015 A1
- Document ID: US20190356015A1
- Status: Published application
- Kind: A1
- Application number: 16/414,978
- Filed: 2019-05-17
- Published: 2019-11-21
- Earliest claimed: 2018-05-17
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Ming Zhang; Changlong Han; Hao Zhang; Cuiping Zhang
- Web page: https://patentgrep.com/patent/US20190356015A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/366: {as layered products}
- 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 4/60: of organic compounds
- H01M 10/0418: {with bipolar electrodes}
- H01M 10/0459: {Cells or batteries with folded separator between plate-like electrodes}
- H01M 10/0567: characterised by the additives
- H01M 2300/0025: Organic electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present disclosure provides a lithium ion battery including a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The positive electrode plate includes a positive electrode current collector, and a positive electrode film disposed on a surface of the positive electrode current collector and containing a positive electrode active material. The positive electrode active material includes a matrix, a first coating layer on the matrix in form of discrete islands, and a second coating layer on the first coating layer and the matrix as a continuous layer. The electrolyte includes an additive A and an additive B. The additive A is selected from a group consisting of cyclic sultone compounds represented by Formula 1 and Formula 2, and combinations thereof, and the additive B is one or two selected from lithium difluorobisoxalate phosphate and lithium tetrafluorooxalate phosphate.

## Claims

### Claim 1

A lithium ion battery, comprising:
a positive electrode plate;
a negative electrode plate;
a separator disposed between the positive electrode plate and the negative electrode plate; and
an electrolyte comprising a lithium salt and an organic solvent,
wherein the positive electrode plate comprises a positive electrode current collector, and a positive electrode film disposed on a surface of the positive electrode current collector and containing a positive electrode active material,
the positive electrode active material comprising:
a matrix having a general formula of LixNiyCozMkMepOrAm, where 0.95 x1.05, 0y 1, 0z1, 0k1, 0p0.1, y+z+k+p=1, 1r2, 0m2, m+r2, M is one or two selected from Mn and Al, Me is selected from a group consisting of Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, Y, Nb, and combinations thereof, and A is selected from a group consisting of N, F, S, Cl, and combinations thereof;
a first coating layer, in form of discrete islands, located on the surface of the matrix, the first coating layer being an oxide of a metal element N, the metal element N being selected from a group consisting of Al, Zr, Mg, Ti, Co, Y, Ba, Cd, and combinations thereof; and
a second coating layer, in form of a continuous layer, located on the first coating layer and the surface of the matrix, the second coating layer being an oxide of an element N′, the element N′ being selected from a group consisting of B, Sn, S, P, and combinations thereof,
wherein the electrolyte further comprises an additive A and an additive B,
the additive A being selected from a group consisting of cyclic sultone compounds represented by Formula 1 and Formula 2, and combinations thereof, where in Formula 1, R is a substituted or unsubstituted linear alkylene group having 3 to 8 carbon atoms, and the substituent, if present, is selected from a group consisting of C1-C6 alkyl, halogen, and combinations thereof, and
the additive B being one or two selected from lithium difluorobisoxalate phosphate and lithium tetrafluorooxalate phosphate,

### Claim 2 (depends on 1)

The lithium ion battery according to claim 1, wherein the positive electrode active material has a specific surface area in a range of 0.3 m2/g to 0.8 m2/g.

### Claim 3 (depends on 1)

The lithium ion battery according to claim 1, wherein
a content of the metal element N in the first coating layer is in a range of 0.05% to 1% based upon the mass of the matrix, and
a content of the element N′ in the second coating layer is in a range of 0.05% to 0.8% based upon the mass of the matrix.

### Claim 4 (depends on 1)

The lithium ion battery according to claim 1, wherein
the first coating layer further contains Li; and
the second coating layer further contains Li.

### Claim 5 (depends on 1)

The lithium ion battery according to claim 1, wherein in the matrix, 0.70≤y≤0.95, 0≤z≤0.2, 0≤k≤0.2, 0≤p≤0.05, and y+z+k+p=1.

### Claim 6 (depends on 1)

The lithium ion battery according to claim 1, wherein in a residual lithium material on the surface of the positive electrode active material, a content of LiOH is higher than a content of Li2CO3.

### Claim 7 (depends on 1)

The lithium ion battery according to claim 1, wherein the additive A is selected from a group consisting of the following compounds, and combinations thereof:

### Claim 8 (depends on 1)

The lithium ion battery according to claim 1, wherein
a content of the additive A is in a range of 0.1% to 5%, preferably 0.3% to 3%, further preferably 0.5% to 2% based upon the total mass of the electrolyte;
a content of the additive B is in a range of 0.01% to 3%, preferably 0.1% to 2%, and further preferably 0.2% to 1% based upon the total mass of the electrolyte.

### Claim 9 (depends on 1)

The lithium ion battery according to claim 1, wherein the organic solvent is at least two of ethylene carbonate, propylene carbonate, butylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, 1,4-butyrolactone, methyl propionate, methyl butyrate, ethyl acetate, ethyl propionate, ethyl butyrate, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone.

### Claim 10 (depends on 1)

The lithium ion battery according to claim 1, wherein the electrolyte further comprises one or more of vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, succinonitrile, adipicdinitrile, ethylene sulfate, tris(trimethylsilyl) phosphate, and tris(trimethylsilyl) borate.