# US 12,180,088 B2 · Positive electrode active material for secondary battery, manufacturing method thereof, and secondary battery including same

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- Number: US 12,180,088 B2
- Document ID: US12180088B2
- Status: Granted
- Kind: B2
- Application number: 17/689,217
- Filed: 2022-03-08
- Published: 2022-06-16
- Granted: 2024-12-31
- 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/US12180088B2

## 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 positive electrode active material for a secondary battery, comprising:
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, wherein
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,
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; and
the cation mixing ratio of Ni cations in a lithium layer in the lithium transition metal oxide structure is less than 1%,
wherein the positive electrode active material exhibits a maximum value of heat flow of less than 200 mW determined with differential scanning calorimetry (DSC) based on 15 mg sample.

### Claim 2 (depends on 1)

The positive electrode active material of claim 1, wherein the content of lithium by-products present in the positive active material is greater than 0.3 wt % to 1 wt % or less.

### Claim 3 (depends on 1)

The positive electrode active material of claim 1, wherein the lithium transition metal oxide comprises a layered structural phase and a spinel-like structural phase.

### Claim 4 (depends on 1)

The positive electrode active material of claim 1, wherein the positive active material has a crystal density of 4.76 g/cm3 or more.

### Claim 5 (depends on 1)

The positive electrode active material of claim 1, wherein the positive active material has a BET specific surface area of 0.5 m2/g or less.

### Claim 6 (depends on 1)

A positive electrode for a secondary battery comprising the positive electrode active material for a secondary battery of claim 1.

### Claim 7 (depends on 6)

A lithium secondary battery comprising the positive electrode for a secondary battery of claim 6.

### Claim 8 (depends on 1)

The positive electrode active material of claim 1, wherein the positive electrode active material exhibits a maximum peak in a temperature range of 220 to 250° C. determined with differential scanning calorimetry (DSC) based on 15 mg sample.