# US 2019/0245199 A1 · Positive active material and lithium-ion battery

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- Number: US 2019/0245199 A1
- Document ID: US20190245199A1
- Status: Published application
- Kind: A1
- Application number: 16/249,888
- Filed: 2019-01-16
- Published: 2019-08-08
- Earliest claimed: 2018-02-07
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Qiao Zeng; Kefei Wang
- Web page: https://patentgrep.com/patent/US20190245199A1

## CPC

- H01M 4/364: {as mixtures}
- C01G 51/40: Complex oxides containing cobalt and at least one other metal element
- C01G 51/42: containing alkali metals, e.g. LiCoO2
- C01G 51/50: of the type (MnO2)n-, e.g. Li(CoxMn1-x)O2 or Li(MyCoxMn1-x-y)O2
- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2004/03: obtained by SEM
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/40: Electric properties
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present application provides a positive active material, a positive electrode and a lithium-ion battery. The positive active material comprising a first particle and a second particle, wherein the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M is at least two selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, the element N is at least one selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles. The positive active material of the present application has a good stability and can improve the capacity retention rate of the lithium-ion battery.

## Claims

### Claim 1

A positive active material, comprising a first particle and a second particle, wherein the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M is at least two selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, the element N is at least one selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles.

### Claim 2 (depends on 1)

The positive active material according to claim 1, wherein the first particle has a chemical formula of LinCoxM1-xO2-y, and the second particle has a chemical formula of LinCoxN1-xO2-y, and 0.8≤n≤1.2, 0<x<1, −0.1≤y≤0.2.

### Claim 3 (depends on 1)

The positive active material according to claim 1, wherein the particle diameter of the first particle is smaller than the particle diameter of the second particle.

### Claim 4 (depends on 3)

The positive active material according to claim 3, wherein the particle diameter of the first particle is smaller than Dv50 of the positive active material, and the particle diameter of the second particle is larger than Dv50 of the positive active material.

### Claim 5 (depends on 1)

The positive active material according to claim 1, wherein each of the elements M is contained in the first particle in an amount of more than 200 ppm, and each of the elements N is contained in the second particle in an amount of more than 200 ppm.

### Claim 6 (depends on 1)

The positive active material according to claim 1, wherein the positive active material meets the following formula (1):
(a/b)/(c/d)>1 formula (1)
a represents the total mass of the element M in the first particle;
b represents the mass of the element Co in the first particle;
c represents the total mass of the element N in the second particle;
d represents the mass of the element Co in the second particle.

### Claim 7 (depends on 1)

The positive active material according to claim 1, wherein the positive active material meets the following formula (2):
(A/B)/(C/D)>1 formula (2)
A represents the total molar amount of the element M in the first particle;
B represents the molar amount of the element Co in the first particle;
C represents the total molar amount of the element N in the second particle;
D represents the molar amount of the element Co in the second particle.

### Claim 8 (depends on 6)

The positive active material according to claim 6, wherein the positive active material has a value of (a/b)/(c/d) of 1.3 to 10.

### Claim 9 (depends on 1)

The positive active material according to claim 1, wherein the volume-based particle size distribution curve of the positive active material comprises a first peak and a second peak.

### Claim 10 (depends on 9)

The positive active material according to claim 9, wherein the peak height of the second peak is greater than the peak height of the first peak.

### Claim 11 (depends on 1)

The positive active material according to claim 1, wherein the particle diameter of the positive active material meets the following formula (3):
(Dv90−Dv50)−(Dv50−Dv10)≤2.5 formula (3).

### Claim 12

A positive electrode, wherein comprising a positive active material, wherein the positive active material comprising a first particle and a second particle, wherein the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M is at least two selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, the element N is at least one selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles.

### Claim 13 (depends on 12)

The positive electrode according to claim 12, wherein the particle diameter of the first particle is smaller than the particle diameter of the second particle.

### Claim 14 (depends on 13)

The positive electrode according to claim 13, wherein the particle diameter of the first particle is smaller than Dv50 of the positive active material, and the particle diameter of the second particle is larger than Dv50 of the positive active material.

### Claim 15 (depends on 12)

The positive electrode according to claim 12, wherein each of the elements M is contained in the first particle in an amount of more than 200 ppm, and each of the elements N is contained in the second particle in an amount of more than 200 ppm.

### Claim 16 (depends on 12)

The positive electrode according to claim 12, wherein the positive active material meets the following formula (1):
(a/b)/(c/d)>1 formula (1)
a represents the total mass of the element M in the first particle;
b represents the mass of the element Co in the first particle;
c represents the total mass of the element N in the second particle;
d represents the mass of the element Co in the second particle.

### Claim 17 (depends on 12)

The positive electrode according to claim 12, wherein the positive active material meets the following formula (2):
(A/B)/(C/D)>1 formula (2)
A represents the total molar amount of the element M in the first particle;
B represents the molar amount of the element Co in the first particle;
C represents the total molar amount of the element N in the second particle;
D represents the molar amount of the element Co in the second particle.

### Claim 18

A lithium-ion battery, wherein comprising a positive electrode with a positive active material, wherein the positive active material comprising a first particle and a second particle, wherein the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M is at least two selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, the element N is at least one selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles.

### Claim 19 (depends on 18)

The lithium-ion battery according to claim 18, wherein the compact density of the positive electrode is g/cm3.

### Claim 20 (depends on 18)

The lithium-ion battery according to claim 18, wherein the particle diameter of the first particle is smaller than the particle diameter of the second particle.