# US 12,770,885 B2 · Negative electrode, method for manufacturing the same, and secondary battery comprising the same

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- Number: US 12,770,885 B2
- Document ID: US12770885B2
- Status: Granted
- Kind: B2
- Application number: 17/768,690
- Filed: 2020-11-06
- Published: 2024-01-25
- Granted: 2026-10-20
- Earliest claimed: 2019-11-08
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Yeon Suk Hong; Suk Il Youn; Joon Kwon
- Web page: https://patentgrep.com/patent/US12770885B2

## CPC

- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 10/052: Li-accumulators
- H01M 2004/027: {Negative electrodes}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

Disclosed is a method for manufacturing of a negative electrode, a negative electrode, and a secondary battery, wherein the method includes forming a polymer layer on a rear surface of a current collector, forming a preliminary negative electrode active material layer on a front surface of the current collector, and forming a pre-lithiation layer including lithium on the preliminary negative electrode active material layer, wherein the polymer layer includes a copolymer having a first unit represented by Formula 1, and at least one of a second unit represented by Formula 2 or a third unit represented by Formula 3.

## Claims

### Claim 1

A negative electrode comprising:
a current collector having a front surface and a rear surface which respectively have a continuous surface;
a negative electrode active material layer on the front surface of the current collector; and
a polymer layer on the rear surface of the current collector,
wherein the negative electrode active material layer is not in direct contact with the polymer layer,
wherein the negative electrode active material layer is in direct contact with the current collector, and
wherein the polymer layer comprises a copolymer having a first unit represented by Formula 1, and at least one of a second unit represented by Formula 2 or a third unit represented by Formula 3:
wherein, in Formula 3, R is each independently H or CH2CO2H.

### Claim 2 (depends on 1)

The negative electrode of claim 1, wherein a weight average molecular weight of the copolymer is from 200,000 g/mol to 1,000,000 g/mol.

### Claim 3 (depends on 1)

The negative electrode of claim 1, wherein a weight average molecular weight of the copolymer is from 300,000 g/mol to 600,000 g/mol.

### Claim 4 (depends on 1)

The negative electrode of claim 1, wherein an amount of a sum of the second unit represented by Formula 2 and the third unit represented by Formula 3 present in the copolymer is from 10 mol % to 90 mol %.

### Claim 5 (depends on 1)

The negative electrode of claim 1, wherein a thickness of the polymer layer is from 0.1 μm to 10 μm.

### Claim 6 (depends on 1)

The negative electrode of claim 1, further comprising lithium on the negative electrode active material layer.

### Claim 7 (depends on 1)

A secondary battery comprising the negative electrode of claim 1.