# US 11,299,401 B2 · Positive electrode active material for secondary battery, manufacturing method thereof, and secondary battery including same

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- Number: US 11,299,401 B2
- Document ID: US11299401B2
- Status: Granted
- Kind: B2
- Application number: 16/316,554
- Filed: 2017-12-19
- Published: 2019-10-03
- Granted: 2022-04-12
- Earliest claimed: 2016-12-28
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Ji Hye Kim; Byung Chun Park; So Ra Baek; Tae Gu Yoo; Wang Mo Jung
- Web page: https://patentgrep.com/patent/US11299401B2

## CPC

- C01G 53/42: containing alkali metals, e.g. LiNiO2
- 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 4/364: {as mixtures}
- 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 2002/60: Compounds characterised by their crystallite size
- C01P 2006/10: Solid density
- C01P 2006/12: Surface area
- H01M 2004/028: {Positive electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- 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)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 invention provides a positive electrode active material for a secondary battery, which includes a lithium transition metal oxide including nickel (Ni) and cobalt (Co), and at least one selected from the group consisting of aluminum (Al), manganese (Mn), and a combination thereof. The lithium transition metal oxide is characterized in that the content of nickel (Ni) in the total transition metal elements is 80 mol % or more, and the cation mixing ratio of Ni cations in a lithium layer in the lithium transition metal oxide structure is 1.1% or less.

## Claims

### Claim 1

A method for preparing a positive electrode active material for a secondary battery, comprising:
preparing a lithium transition metal oxide including nickel (Ni) and cobalt (Co), and at least one selected from the group consisting of aluminum (Al), manganese (Mn), and a combination thereof;
rinsing the lithium transition metal oxide with water to remove lithium impurities present on a surface of the lithium transition metal oxide; and
subjecting the lithium transition metal oxide rinsed with water to a high-temperature heat treatment to form a high-temperature heat treated lithium transition metal oxide, wherein
the high-temperature heat treatment includes:
elevating a temperature to an elevated temperature;
maintaining the elevated temperature; and
cooling,
wherein an amount of time spent in the elevating the temperature step is 20 to 30% of a total time of the high-temperature heat treatment,
wherein an amount of time spent in the maintaining step is 40 to 50% of the total time of the high-temperature heat treatment, and
wherein an amount of time spent in the cooling step is 20 to 30% of the total time of the high-temperature heat treatment.

### Claim 2 (depends on 1)

The method of claim 1, wherein the total time of the high-temperature heat treatment is 6 to 10 hours.

### Claim 3 (depends on 1)

The method of claim 1, wherein, in the maintaining the elevated temperature step, the elevated temperature step is 600° C. to 900° C.

### Claim 4 (depends on 1)

The method of claim 1, wherein, in the elevating the temperature step, the temperature is elevated at a rate of step 2 to 7° C./min.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cooling step is natural cooling.

### Claim 6 (depends on 1)

The method of claim 1, wherein the high-temperature heat treatment is performed in an oxygen atmosphere having an oxygen partial pressure of 80% or more.

### Claim 7 (depends on 1)

The method of claim 1, wherein the rinsing is performed using 50 to 100 parts by weight of pure water based on 100 parts by weight of the lithium transition metal oxide.

### Claim 8 (depends on 1)

The method of claim 1, wherein the rinsing is performed at a temperature of −10 to 30° C.

### Claim 9 (depends on 1)

The method of claim 1, wherein the lithium transition metal oxide is represented by Formula 1 below:
LiaNi1-x1-y1-z1Cox1M1y1M2z1M3q1O2 [Formula 1]
(in Formula 1, M1 is at least one selected from the group consisting of Mn, Al, and a combination thereof, and M2 and M3 are each independently at least one selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, W, Mo, and a combination thereof, and 1.0≤a≤1.5, 0<x1≤0.2, 0<y1≤0.2, 0≤z1≤0.1, 0<q1≤0.1, and 0<x1+y1+z1≤0.2).

### Claim 10 (depends on 1)

The method of claim 1, wherein the preparing a lithium transition metal oxide is performed by mixing a precursor represented by Formula 2 below and a lithium-containing raw material, and firing the mixture at 700 to 900° C.:
Ni1-x2-y2-z2Cox2M1y2M2z2(OH)2 [Formula 2]
(in Formula 2, M1 is at least one selected from the group consisting of Mn, Al, and a combination thereof, M2 is at least one selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, W, Mo, and a combination thereof, and 0<x2≤0.2, 0<y2≤0.2, 0≤z2≤0.1, 0≤q2≤0.1, 0<x2+y2+z2≤0.2).

### Claim 11 (depends on 1)

The method of claim 1, wherein the method further comprises:
mixing the high-temperature heat-treated lithium transition metal oxide with at least one selected from the group consisting of H3BO3, B2O3, Al2O3, and a combination thereof to form a mixture, and heat treating the mixture at a temperature of 200 to 500° C. to form a coating layer on the surface of the lithium transition metal oxide.