# US 12,191,484 B2 · Positive electrode material for lithium secondary battery, and positive electrode and lithium secondary battery including same

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- Number: US 12,191,484 B2
- Document ID: US12191484B2
- Status: Granted
- Kind: B2
- Application number: 17/298,818
- Filed: 2019-12-04
- Published: 2022-02-24
- Granted: 2025-01-07
- Earliest claimed: 2018-12-10
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jung Min Han; Dong Hun Lee; Sung Bin Park; Hyung Man Cho; Jin Tae Hwang; Wang Mo Jung
- Web page: https://patentgrep.com/patent/US12191484B2

## 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 4/131: 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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 material and a positive electrode and a lithium secondary battery including the same are provided. The positive electrode material having a bimodal particle size distribution which includes large-diameter particles and small-diameter particles having different average particle diameters (D50), wherein the large-diameter particles are lithium composite transition metal oxide having a nickel content of 80 atm % or more in all transition metals thereof, and the small-diameter particles are a lithium composite transition metal oxide including nickel, cobalt, and aluminum, having a nickel content of 80 atm % to 85 atm % in all transition metals, and having an atomic ratio of the cobalt to the aluminum (Co/Al) of 1.5 to 5.

## Claims

### Claim 1

A positive electrode material having a bimodal particle size distribution, comprising large-diameter particles and small-diameter particles having different average particle diameters (D50),
wherein the large-diameter particles are a lithium composite transition metal oxide having a nickel content of 80 atm % or greater in all transition metals, and
the small-diameter particles are a lithium composite transition metal oxide including nickel, cobalt, and aluminum, having a nickel content of 80 atm % to 85 atm % in all transition metals, and having an atomic ratio of the cobalt to the aluminum (Co/Al) of 1.5 to 5,
wherein the small-diameter particles comprise a lithium composite transition metal oxide represented by Formula 1 below, and
wherein the large-diameter particles comprise a lithium composite transition metal oxide represented by Formula 3 below:
Lix[NiyCozAlwM1v]O2 [Formula 1]
wherein,
M1 is one or more selected from the group consisting of Mn, W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and
0.9≤x≤1.5, 0.8≤y≤0.85, 0<z≤0.1, 0<w≤0.1, 1.5≤z/w≤5, and 0≤v<0.2,
Lia[NibCocM2dM3e]O2 [Formula 3]
wherein,
M2 is Ald1Mnd2,
M3 is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and
0.9≤a≤1.5, 0.8≤b<1, 0<c≤0.15, 0<d<0.2, 0<d1≤0.1, 0<d2<0.2, and 0≤e<0.2.

### Claim 2 (depends on 1)

The positive electrode material of claim 1, wherein the small-diameter particles are a lithium composite transition metal oxide represented by Formula 2 below:
Lix[NiyCozAlwMnv]O2 [Formula 2]
wherein, 0.9≤x≤1.5, 0.8≤y≤0.85, 0<z≤0.1, 0<w≤0.1, 1.5≤z/w≤5, and 0≤v<0.2.

### Claim 3 (depends on 1)

The positive electrode material of claim 1, wherein in the Formula 3, 1.5≤c/d1≤5.

### Claim 4 (depends on 1)

The positive electrode material of claim 1, wherein the average particle diameter (D50) of the small-diameter particles is from 2 to 8 μm.

### Claim 5 (depends on 1)

The positive electrode material of claim 1, wherein the average particle diameter (D50) of the large-diameter particles is from 10 to 20 μm.

### Claim 6 (depends on 1)

The positive electrode material of claim 1, wherein the small-diameter particles and the large-diameter particles are included in a weight ratio of 1:9 to 5:5.

### Claim 7 (depends on 1)

A positive electrode comprising:
a positive electrode current collector; and
a positive electrode active material layer formed on the positive electrode current collector,
wherein the positive electrode active material layer comprises the positive electrode material of claim 1.

### Claim 8 (depends on 7)

A lithium secondary battery comprising:
the positive electrode of claim 7;
a negative electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte.

### Claim 9

A positive electrode material having a bimodal particle size distribution, comprising large-diameter particles and small-diameter particles having different average particle diameters (D50),
wherein the large-diameter particles are a lithium composite transition metal oxide having a nickel content of 80 atm % or greater in all transition metals, and
the small-diameter particles are a lithium composite transition metal oxide including nickel, cobalt, and aluminum, having a nickel content of 80 atm % to 85 atm % in all transition metals, and having an atomic ratio of the cobalt to the aluminum (Co/Al) of 1.5 to 5,
wherein the small-diameter particles comprise a lithium composite transition metal oxide represented by Formula 2 below, and
wherein the large-diameter particles comprise a lithium composite transition metal oxide represented by Formula 3 below:
Lix[NiyCozAlwMnv]O2 [Formula 2]
wherein, 0.9≤x≤1.5, 0.8≤y≤0.85, 0<z≤0.1, 0<w≤0.1, 1.5≤z/w≤5, and 0≤v<0.2,
Lia[NibCocM2dM3e]O2 [Formula 3]
wherein,
M2 is Ald1Mnd2,
M3 is one or more selected from the group consisting of W, Cu, Fe, Ba, V, Cr, Ti, Zr, Zn, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and
0.9≤a≤1.5, 0.8≤b<1, 0<c≤0.15, 0<d<0.2, 0<d1≤0.1, 0<d2<0.2, and 0≤e<0.2.