# US 12,119,488 B2 · Positive electrode active material for lithium secondary battery and lithium secondary battery

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- Number: US 12,119,488 B2
- Document ID: US12119488B2
- Status: Granted
- Kind: B2
- Application number: 15/734,056
- Filed: 2019-06-19
- Published: 2021-07-22
- Granted: 2024-10-15
- Earliest claimed: 2018-06-20
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Na Ri Park; Yeo June Yoon; Sung Ho Ban; Jun Ho Eom; Hyeon Hui Baek; Ki Cheol Shin
- Web page: https://patentgrep.com/patent/US12119488B2

## 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 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- 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}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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

Provided is a lithium secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode includes, as a positive electrode active material, a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 50 atm % or more of total transition metals, and wherein the layered structure of the positive electrode active material is phase-transformed into a spinel structure at a temperature of 300° C. or more in a fully charged state.

## Claims

### Claim 1

A lithium secondary battery comprising:
a positive electrode;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte,
wherein the positive electrode includes, as a positive electrode active material, a lithium composite transition metal oxide which has a layered structure,
wherein the lithium composite transition metal oxide is represented by Chemical Formula 1:
Lix[NiaCobMncMd]O2 [Chemical Formula 1]
wherein, in Chemical Formula 1,
M includes a first doping element and a second doping element,
wherein the first doping element includes Ti and one or more elements selected from the group consisting of Cr, V, Fe, Zn, Cu and Mg, and
the second doping element includes W and one or more elements selected from the group consisting of Nb, Ta, and Mo, and
0.98≤x≤1.2, 0.85≤a≤0.95, 0≤b<0.15, 0<c<0.15, and 0<d<0.15, and
wherein the first doping element is included in an amount of 1,000 ppm to 3,000 ppm based on a total weight of the lithium composite transition metal oxide,
wherein the second doping element is included in an amount of 1,000 ppm to 5,000 ppm based on a total weight of the lithium composite transition metal oxide,
wherein the lithium composite transition metal oxide includes, on a surface thereof, a coating layer including one or more elements selected from the group consisting of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si and S,
wherein the positive electrode active material has a phase-transform temperature of 300° C. or more, wherein the phase-transform temperature is a temperature at which the layered structure is changed to a spinel structure in a fully charged state.

### Claim 2 (depends on 1)

The lithium secondary battery of claim 1, wherein a c parameter of the positive electrode active material, which is measured while raising a temperature to 350° C. in a fully charged state, reaches a maximum at a temperature of 280° C. to 320° C.

### Claim 3

A positive electrode active material for a lithium secondary battery, the positive electrode active material comprising a lithium composite transition metal oxide having a layered structure, wherein the positive electrode active material has a phase-transform temperature of 300° C. or more, the phase-transform temperature is a temperature at which the layered structure is changed to a spinel structure in a fully charged state,
wherein the lithium composite transition metal oxide is represented by Chemical Formula 1:
Lix[NiaCobMncMd]O2 [Chemical Formula 1]
wherein, in Chemical Formula 1,
M includes a first doping element and a second doping element,
wherein the first doping element includes Ti and one or more elements selected from the group consisting of Cr, V, Fe, Zn, Cu and Mg, and
the second doping element includes W and one or more elements selected from the group consisting of Nb, Ta, and Mo, and
0.98≤x≤1.2, 0.85≤a≤0.95, 0≤b<0.15, 0<c<0.15, and 0<d<0.15,
wherein the first doping element is included in an amount of 1,000 ppm to 3,000 ppm based on a total weight of the lithium composite transition metal oxide,
wherein the second doping element is included in an amount of 1,000 ppm to 5,000 ppm based on a total weight of the lithium composite transition metal oxide, and
wherein the lithium composite transition metal oxide includes, on a surface thereof, a coating layer including one or more elements selected from the group consisting of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si and S.