# US 2022/0045320 A1 · Positive electrode active material and method for preparing the same

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- Number: US 2022/0045320 A1
- Document ID: US20220045320A1
- Status: Published application
- Kind: A1
- Application number: 16/988,024
- Filed: 2020-08-07
- Published: 2022-02-10
- Earliest claimed: 2020-08-07
- Assignees: LG Chem, Ltd.; The Regents of the University of California
- Applicants: LG Chem, Ltd.; The Regents of the University of California
- Inventors: Chi Ho Jo; Wang Mo Jung; Hyeseung Chung; Ying Shirley Meng
- Web page: https://patentgrep.com/patent/US20220045320A1

## CPC

- 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 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- 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 4/366: {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 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

A method for preparing a positive electrode active material and a positive electrode active material prepared thereby are provided. The method includes a first step of reacting a coating precursor preparation solution including a metal solution containing metal ions included in a coating layer and a chelating agent to prepare a coating precursor, which is a complex in which the metal ions and the chelating agent are combined, and a second step of dry-mixing particles having a specific composition and the coating precursor, followed by firing the mixture to form a coating layer having a specific composition on surfaces of the particles.

## Claims

### Claim 1

A method for preparing a positive electrode active material comprising:
reacting a coating precursor preparation solution comprising a metal solution containing metal ions and a chelating agent to prepare a coating precursor, wherein the coating precursor is a complex in which the metal ions and the chelating agent are combined; and
dry-mixing particles having the composition of Formula 1 or Formula 2 below and the coating precursor to obtain a mixture, followed by firing the mixture to form a coating layer having the composition of Formula 3 below on surfaces of the particles:
Li[Co1-aM1a]O2 [Formula 1]
wherein, in Formula 1 above,
M1 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0≤a<0.1,
Li[NibCocMndM2e]O2 [Formula 2]
wherein, in Formula 2 above,
M2 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0.8≤b<1, 0<c<0.2, 0<d<0.2, 0≤e<0.1, and b+c+d+e=1,
Li[NifCogMnhM3i]O2 [Formula 3]
wherein, in Formula 3 above, M3 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0<f≤0.4, 0≤g≤0.6, 0≤h≤0.6, 0≤i<0.1, and f+g+h+i=1.

### Claim 2 (depends on 1)

The method of claim 1, wherein the chelating agent is a Lewis acid compound including a carboxylic acid group or a nitrogen element.

### Claim 3 (depends on 2)

The method of claim 2, wherein the chelating agent is one or more selected from the group consisting of citric acid, polyvinylpyrrolidone, and glycolic acid.

### Claim 4 (depends on 1)

The method of claim 1, wherein the coating precursor preparation solution is prepared by adding the metal solution containing ions and the chelating agent to a solvent, followed by mixing.

### Claim 5 (depends on 4)

The method of claim 4, wherein the solvent is one or more selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 2,3-butanediol.

### Claim 6 (depends on 1)

The method of claim 1, wherein the average particle diameter (D50) of the coating precursor is 1 nm to 500 nm.

### Claim 7 (depends on 1)

The method of claim 1, wherein the reacting the coating precursor preparation solution is performed at 200° C. to 300° C.

### Claim 8 (depends on 1)

The method of claim 1, wherein the firing is performed at a temperature 800° C. to 900° C.

### Claim 9 (depends on 8)

The method of claim 8, wherein the firing is performed after raising the temperature to 800° C. to 900° C. at a rate of 5° C./min to 10° C./min.

### Claim 10

A positive electrode active material comprising:
particles having the composition of Formula 1 or Formula 2 below; and
a coating layer formed on surfaces of the particles and having the composition of Formula 3 below:
Li[Co1-aM1a]O2 [Formula 1]
wherein, in Formula 1 above,
M1 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0≤a<0.1,
Li[NibCocMndM2e]O2 [Formula 2]
wherein, in Formula 2 above,
M2 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0.8≤b<1, 0<c<0.2, 0<d<0.2, 0≤e<0.1, and b+c+d+e=1,
Li[NifCogMnhM3i]O2 [Formula 3]
wherein, in Formula 3 above,
M3 is one or more selected from the group consisting of B, Mg, Ca, Al, Ti, V, Cr, Fe, Zn, Ga, Y, Zr, Nb, Mo, Ta, and W, and 0<f<0.4, 0≤g≤0.6, 0≤h≤0.6, 0≤i<0.1, and f+g+h+i=1.

### Claim 11 (depends on 10)

The positive electrode active material of claim 10, wherein the surfaces of the particles are completely surrounded by the coating layer.

### Claim 12 (depends on 10)

The positive electrode active material of claim 10, wherein the thickness of the coating layer is 1 nm to 500 nm.

### Claim 13 (depends on 10)

A positive electrode for a lithium secondary battery, the positive electrode comprising the positive electrode active material according to claim 10.

### Claim 14 (depends on 13)

A lithium secondary battery comprising the positive electrode for a lithium secondary battery according to claim 13.