# US 12,191,488 B2 · Positive electrode active material and positive electrode including the same

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- Number: US 12,191,488 B2
- Document ID: US12191488B2
- Status: Granted
- Kind: B2
- Application number: 18/540,301
- Filed: 2023-12-14
- Published: 2024-06-27
- Granted: 2025-01-07
- Earliest claimed: 2022-12-15
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Eun Sol Lho; Jin Tae Hwang; Su Yeon Oh; Byung Chun Park; Sang Min Park; Sang Wook Lee; Seul Ki Kim; Hyeong Ii Kim
- Web page: https://patentgrep.com/patent/US12191488B2

## 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 4/02: Electrodes composed of, or comprising, active material
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 4/366: {as layered products}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 10/052: Li-accumulators
- 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 positive electrode active material includes a nickel-based lithium composite metal oxide having a Ni content of 80 atm % or greater among transition metals except lithium, and in the form of a single particle or pseudo-single particle. The nickel-based lithium composite metal oxide has a coating layer positioned on the surface thereof, wherein the coating layer contains cobalt. The positive electrode active material also satisfies [Equation 1] 1≤XY/Z≤3, wherein X is the molar number (mol %) of Co in the coating layer based on 100 moles of the nickel-based lithium composite metal oxide, Y is the average particle diameter (μm) of nodules of the nickel-based lithium composite metal oxide, and Z is D50 (μm) of the positive electrode active material, wherein Z is from 5 μm to 12 μm.

## Claims

### Claim 1

A positive electrode active material comprising:
a nickel-based lithium composite metal oxide having a Ni content of 80 atm % or greater among transition metals except lithium, wherein the nickel-based lithium composite metal oxide is in a form of a single particle or pseudo-single particle; and
a coating layer positioned on a surface of the nickel-based lithium composite metal oxide, wherein the coating layer includes cobalt,
wherein the positive electrode active material satisfies Equation 1 below:
1
≤
XY
/
Z
≤
3
[
Equation
⁢
1
]
wherein, X (mol %) is a number of moles of Co in the coating layer based on 100 moles of the nickel-based lithium composite metal oxide, Y (μm) is an average particle diameter of nodules of the nickel-based lithium composite metal oxide, and Z (μm) is D50 of the positive electrode active material, wherein Z is from 5 μm to 12 μm, and
wherein the nickel-based lithium composite metal oxide is represented by Formula 2 below:
wherein, M1 is Mn, Al, or a combination thereof, M2 is one or more selected from the group consisting of W, Y, Ba, Ca, Ti, Mg, Ta, and Nb, and 0.8≤a≤1.2, 0.8≤b<1, 0<c<0.2, 0<d<0.2, and 0≤e≤0.1.

### Claim 2 (depends on 1)

The positive electrode active material of claim 1, wherein X is from 1 mol % to 5 mol %.

### Claim 3 (depends on 1)

The positive electrode active material of claim 1, wherein Y is from 1 μm to 10 μm.

### Claim 4 (depends on 1)

The positive electrode active material of claim 1, wherein a ratio of Z to Y (Z/Y) is from 1 to 3.

### Claim 5 (depends on 1)

The positive electrode active material of claim 1, wherein the positive electrode active material comprises a compound other than the nickel-based lithium composite metal oxide of Formula 2 in an amount ranging from 1 mol % to 5 mol % with respect to the nickel-based lithium composite metal oxide.

### Claim 6 (depends on 1)

The positive electrode active material of claim 1, wherein the nickel-based lithium composite metal oxide has an average crystallite size ranging from 170 nm to 300 nm.

### Claim 7 (depends on 1)

The positive electrode active material of claim 1, wherein the nickel-based lithium composite metal oxide has a strain value ranging from 200×10−6 to 380×10−6.

### Claim 8 (depends on 1)

A positive electrode comprising a positive electrode active material layer including the positive electrode active material of claim 1.

### Claim 9 (depends on 8)

The positive electrode of claim 8, wherein the positive electrode active material is included in an amount of 90 wt % to 100 wt % with respect to a total weight of the positive electrode active material layer included in the positive electrode.

### Claim 10 (depends on 8)

The positive electrode of claim 8, wherein a ratio of the positive electrode active material having a size of from 5 μm to 7 μm with respect to an entire positive electrode active material is 80 vol % or greater.

### Claim 11 (depends on 9)

A lithium secondary battery comprising the positive electrode of claim 9; a negative electrode; and an electrolyte.