# US 2019/0173086 A1 · Lithium secondary battery and binder for anode of the lithium secondary battery

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- Number: US 2019/0173086 A1
- Document ID: US20190173086A1
- Status: Published application
- Kind: A1
- Application number: 16/038,054
- Filed: 2018-07-17
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: Hyundai Motor Company; Kia Motors Corporation; Incheon University Industry Academic Cooperation Foundation
- Applicants: Hyundai Motor Company; Kia Motors Corporation; Incheon University Industry Academic Cooperation Foundation
- Inventors: Seung-Min OH; Yeolmae YEO; KiSeok KOH; Yoon Sung LEE; Tae-Hyun KIM; Kukjoo LEE; Junyoung MUN
- Web page: https://patentgrep.com/patent/US20190173086A1

## CPC

- H01M 4/622: {being polymers}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/4295: {Natural cotton, cellulose or wood}
- H01M 50/44: Fibrous material
- H01M 50/417: Polyolefins
- H01M 2004/027: {Negative electrodes}
- 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

Disclosed herein is a lithium secondary battery capable of improving an output characteristic, a life characteristic, and stability of electrode adhesion by using a binder containing dopamine-polymerized heparin in an anode containing silicon. In accordance with an aspect of the present disclosure, a lithium secondary battery includes: a cathode; an anode; a separation film disposed between the cathode and the anode; and an electrolyte, wherein the anode comprises a binder containing carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), and polysaccharide including a sulfonate functional group and an amine group.

## Claims

### Claim 1

A lithium secondary battery comprising:
a cathode;
an anode;
a separation film disposed between the cathode and the anode; and
an electrolyte,
wherein the anode comprises a binder containing carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), and polysaccharide including a sulfonate functional group and an amine group.

### Claim 2 (depends on 1)

The lithium secondary battery according to claim 1, wherein the binder comprises the CMC of 10 wt % or less (except for zero).

### Claim 3 (depends on 1)

The lithium secondary battery according to claim 1, wherein the binder comprises the SBR of 10 wt % or less (except for zero).

### Claim 4 (depends on 1)

The lithium secondary battery according to claim 1, wherein the binder comprises the CMC and the SBR of 10 wt % or less (except for zero).

### Claim 5 (depends on 1)

The lithium secondary battery according to claim 1, wherein the polysaccharide comprises dopamine-polymerized heparin.

### Claim 6 (depends on 5)

The lithium secondary battery according to claim 5, wherein the binder comprises dopamine-polymerized heparin of 20 wt % or less (except for zero).

### Claim 7 (depends on 1)

The lithium secondary battery according to claim 1, wherein the binder comprises polysaccharide of 20 wt % or less (except for zero).

### Claim 8 (depends on 1)

The lithium secondary battery according to claim 1, wherein the anode comprises graphite and silicon.

### Claim 9

A binder for an anode of a lithium secondary battery, comprising:
carboxymethyl cellulose (CMC) of 10 wt % or less (except for zero);
styrene-butadiene rubber (SBR) of 10 wt % or less (except for zero); and
dopamine-polymerized heparin of 20 wt % or less (except for zero).

### Claim 10 (depends on 9)

The binder according to claim 9, wherein a total content of the CMC and the SBR is 10 wt % or less (except for zero).

### Claim 11 (depends on 9)

The binder according to claim 9, wherein a content of the CMC is 5 wt % or less (except for zero).

### Claim 12 (depends on 9)

The binder according to claim 9, wherein a content of the SBR is 5 wt % or less (except for zero).

### Claim 13 (depends on 9)

The binder according to claim 9, wherein a content of the dopamine-polymerized heparin is 10 wt % or less (except for zero).