# US 10,319,996 B2 · Cathode material for lithium ion secondary battery, method of producing the same, and lithium ion secondary battery

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- Number: US 10,319,996 B2
- Document ID: US10319996B2
- Status: Granted
- Kind: B2
- Application number: 14/815,944
- Filed: 2015-07-31
- Published: 2016-02-18
- Granted: 2019-06-11
- Earliest claimed: 2014-08-13
- Assignees: Microvast Power Systems Co., Ltd.
- Applicants: Microvast Power Systems Co., LTD.
- Inventors: Zhuoqun Zheng; Jian Qiu; Xiaozhen Zhao; Yunhua Nie
- Web page: https://patentgrep.com/patent/US10319996B2

## 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 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/48: of inorganic oxides or hydroxides
- 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
- 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 present invention discloses a cathode material for lithium ion secondary battery. The cathode material is in the form of powder particles. The powder particle includes a bulk portion and a coating portion coated on the outer surface of the bulk portion. The bulk portion is formed of at least one first cathode material which is a lithium-nickel based composite oxide. The first cathode material has electrochemical activity and has high charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li+. The coating portion is formed of at least one second cathode material. The second cathode material has no electrochemical activity or has low charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li+. Lithium ion secondary battery using the cathode material has high energy density, cycling stability, security, and output power.

## Claims

### Claim 1

A cathode material for lithium ion secondary battery, wherein the cathode material is in the form of powder particles, the powder particle includes a bulk portion and a coating portion coated on the outer surface of the bulk portion, the bulk portion is formed of at least one first cathode material which is a lithium-nickel based composite oxide, the first cathode material has electrochemical activity and has high charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li+, the coating portion is formed of at least one second cathode material, the second cathode material has no electrochemical activity or has low charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li+, wherein the first cathode material has a general formula of Li1+δ [Ni1−x−yCoxMy]O2, wherein M is selected at least one metal element from Mn, Na, K, Mg, Ca, Sr, Ba, Al, Ga, In, Ge, Sn, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, Mo, Cd, W, La, Ce, Nd and Sm, wherein 0<δ<0.2, 0<x<0.5, 0<x+y<0.5, and wherein the second cathode material has a general formula of Li 1+η[Mn2−aM′a]O4, wherein M′ is selected at least one metal element from Ni, Co, Na, K, Mg, C, Sr, Ba, A, Ga, In, Ge, Sn, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, Mo, Cd, W, La, Ce, Nd and Sm, wherein 0<η<0.2, 0<a<1.

### Claim 2 (depends on 1)

The cathode material for lithium ion secondary battery of claim 1, wherein the second cathode material is at least one of lithium transition metal oxides.

### Claim 3 (depends on 1)

The cathode material for lithium ion secondary battery of claim 1, wherein in the first cathode material with the general formula of Li1+δ[Ni1−x−yCoxMy]O2, the valence of the metal element Ni and Co is +3, the valence of the metal element M is +2, +3, +4, +5, or +6.

### Claim 4 (depends on 1)

The cathode material for lithium ion secondary battery of claim 1, wherein the weight of the coating portion accounts for 0.1˜10% of the weight of the powder particle.

### Claim 5 (depends on 1)

The cathode material for lithium ion secondary battery of claim 1, wherein an outer surface of the coating portion is dot coated or surface coated with at least one Lewis base.

### Claim 6 (depends on 5)

The cathode material for lithium ion secondary battery of claim 5, wherein the Lewis base is selected from at least one of ZnO, Al2O3, MgO, CaO, ZrO2, TiO2, SnO2 and Sb2O5.

### Claim 7 (depends on 5)

The cathode material for lithium ion secondary battery of claim 5, wherein the weight of the Lewis base accounts for 0.1˜5% of the weight of the powder particle.

### Claim 8 (depends on 1)

The cathode material for lithium ion secondary battery of claim 1, wherein the powder particle is spherical or spheroidal, and the particle diameter is 0.5˜50 μm.

### Claim 9 (depends on 1)

A positive electrode of a lithium ion secondary battery, wherein the positive electrode is made of positive active material which includes the cathode material of claim 1.

### Claim 10 (depends on 1)

A lithium ion secondary battery, wherein the lithium ion secondary battery includes a positive electrode, wherein the positive electrode is made of positive active material which includes the cathode material of claim 1.