# US 2025/0096240 A1 · Electrode for lithium secondary battery

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- Number: US 2025/0096240 A1
- Document ID: US20250096240A1
- Status: Published application
- Kind: A1
- Application number: 18/772,010
- Filed: 2024-07-12
- Published: 2025-03-20
- Earliest claimed: 2019-04-04
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Jihee YOON; Taek Soo LEE; Sang Hoon CHOY; Cheolwoo KIM
- Web page: https://patentgrep.com/patent/US20250096240A1

## CPC

- H01M 4/366: {as layered products}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- 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
- H01M 10/052: Li-accumulators
- 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

Provided is an electrode for a lithium secondary battery having excellent resistance and output characteristics while achieving high capacity characteristics due to a high active material content.

## Claims

### Claim 1

An electrode for a lithium secondary battery, the electrode comprising a current collector; a first active material layer formed on the current collector; and a second active material layer formed on the first active material layer,
wherein the first and second active material layers include active materials comprising an active material A having a D50 particle size of 7 μm to 15 μm and an active material B having a D50 particle size of 2 μm or more to less than 7 μm,
the first and second active material layers are different from each other in term of a weight ratio of the active material A:the active material B, and
a ratio of the active material A in the second active material layer is higher than that in the first active material layer, and
the weight ratio of the active material A:the active material B in the second active material layer is higher than 70:30 and 95:5 or less.

### Claim 2 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the weight ratio of the active material A:the active material B in the first active material layer is higher than 50:50 and 70:30 or less.

### Claim 3 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the weight ratio of the active material A:the active material B in the first active material layer is 60:40 to 70:30, and the weight ratio of the active material A:the active material B in the second active material layer is 80:20 to 90:10.

### Claim 4 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the D50 particle size of the active material A is 7 μm to 11 μm, and the D50 particle size of the active material B is 2 μm to 6 μm.

### Claim 5 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the D50 particle size of the active material A is 8 μm to 10.5 μm, and the D50 particle size of the active material B is 3.5 μm to 6 μm.

### Claim 6 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the active material A and the active material B are homogeneous or heterogeneous positive electrode active materials.

### Claim 7 (depends on 6)

The electrode for a lithium secondary battery of claim 6, wherein the homogeneous or heterogeneous positive electrode active material comprises lithium-manganese oxides, lithium-cobalt oxides, lithium-nickel oxides, lithium-nickel-manganese oxides, lithium-nickel-cobalt oxides, lithium-manganese-cobalt oxides, lithium-nickel-manganese-cobalt oxides, or lithium-nickel-cobalt-transition metal (M) oxide, wherein M is one or more selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg, and Mo.

### Claim 8 (depends on 6)

The electrode for a lithium secondary battery of claim 6, wherein the active material A and the active material B comprise the homogeneous positive electrode active compounds of lithium-nickel-manganese-cobalt oxides.

### Claim 9 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein a loading capacity deviation between the first active material layer and the second active material layer is 0% to 10%.

### Claim 10 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein each of the first and second active material layers has a loading capacity of 12 mg/cm2 to 16 mg/cm2.

### Claim 11 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein each of the first and second active material layers has a thickness of 35 μm to 45 μm.

### Claim 12 (depends on 1)

The electrode for a lithium secondary battery of claim 1, wherein the active materials A and B are lithium-manganese oxides, lithium-cobalt oxides, lithium-nickel oxides, lithium-nickel-manganese oxides, lithium-nickel-cobalt oxides, lithium-manganese-cobalt oxides, lithium-nickel-manganese-cobalt oxides, or lithium-nickel-cobalt-transition metal (M) oxide wherein M is one or more selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg, and Mo.