# US 12,603,288 B2 · Binder, and electrode and lithium secondary battery comprising same

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- Number: US 12,603,288 B2
- Document ID: US12603288B2
- Status: Granted
- Kind: B2
- Application number: 18/744,164
- Filed: 2024-06-14
- Published: 2024-10-03
- Granted: 2026-04-14
- Earliest claimed: 2017-10-16
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Taek Gyoung Kim; Joo Hyeong Lee; Kyung Oh Kim; Doo Kyung Yang
- Web page: https://patentgrep.com/patent/US12603288B2

## CPC

- H01M 4/622: {being polymers}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/38: of elements or alloys
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 10/052: Li-accumulators
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0082: Organic polymers
- 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 binder, an electrode and a lithium secondary battery comprising the same are described, wherein the binder includes a first block including a polymer containing functional groups substitutable with lithium ions and a second block. The second block may include a polymer containing oxygen atoms in the main chain. With such a binder, it is possible to prevent the agglomeration of the slurry for preparing the electrode, thereby preventing the occurrence of cracks on the surface of the electrode and improving the life characteristics of the lithium secondary battery.

## Claims

### Claim 1

A method for preparing an electrode slurry, comprising:
(i) providing an electrically conductive material;
(ii) providing an electrode active material;
(iii) providing a binder; and
(iv) mixing the electrically conductive material, the electrode active material and the binder in a solvent to form a slurry;
wherein the slurry has a solids content of 27.2% to 27.5%;
wherein the binder consists of a random copolymer including a first block and a second block;
wherein the first block is PAA (polyacrylic acid);
wherein the second block is mono-methyl polyethylene glycol acrylate;
wherein the random copolymer comprises 50 wt. % to 90 wt. % of the first block and 10 wt. % to 50 wt. % of the second block;
wherein a weight ratio of the first block to the second block is 80:20; and
wherein the binder has a weight-average molecular weight of 150,000 to 700,000.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the binder has a weight-average molecular weight of 400,000 to 700,000.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the binder has a weight-average molecular weight of 700,000.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the slurry comprises 0.1 to 10 wt. % of the binder, 30 to 95 wt. % of the electrode active material and 2 to 60 wt. % of the electrically conductive material based on the contents of solids.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the electrode slurry is a positive electrode slurry.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the electrode slurry is a negative electrode slurry.

### Claim 7 (depends on 1)

A method for preparing an electrode, comprising coating the electrode slurry prepared according to the method of claim 1 onto a current collector.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the binder has a weight-average molecular weight of 700,000.

### Claim 9 (depends on 7)

The method according to claim 7, wherein the binder has a weight-average molecular weight of 400,000 to 700,000.

### Claim 10 (depends on 7)

The method according to claim 7, wherein the slurry comprises 0.1 to 10 wt. % of the binder, 30 to 95 wt. % of the electrode active material and 2 to 60 wt. % of the electrically conductive material based on the contents of solids.

### Claim 11 (depends on 7)

The method according to claim 7, wherein the slurry has a solids content of 27.2%.

### Claim 12 (depends on 7)

The method according to claim 7, wherein the electrode is a positive electrode.

### Claim 13 (depends on 7)

The method according to claim 7, wherein the electrode is a negative electrode.

### Claim 14 (depends on 1)

An electrode prepared by coating the electrode slurry prepared according to the method claim 1 onto a current collector and drying to remove the solvent.

### Claim 15 (depends on 14)

The electrode according to claim 14, wherein the roughness of the electrode is 3.6 Sa, μm to 3.7 Sa, μm.

### Claim 16 (depends on 14)

The electrode according to claim 14, wherein the adhesive force of the electrode is 2.2 gf/cm to 8.9 gf/cm.

### Claim 17 (depends on 14)

The electrode according to claim 14, wherein the electrode is a positive electrode.

### Claim 18 (depends on 14)

The electrode according to claim 14, wherein the electrode is a negative electrode.

### Claim 19 (depends on 14)

A lithium secondary battery comprising the electrode of claim 14.