# US 9,437,875 B2 · Highly elastic physically cross-linked binder induced by reversible acid-base interaction for high performance silicon anode

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- Number: US 9,437,875 B2
- Document ID: US9437875B2
- Status: Granted
- Kind: B2
- Application number: 14/682,599
- Filed: 2015-04-09
- Published: 2016-08-11
- Granted: 2016-09-06
- Earliest claimed: 2015-02-09
- Assignees: Incheon University Industry Academic Cooperation Foundation
- Applicants: Incheon University Industry Academic Cooperation Foundation
- Inventors: Tae Hyun Kim; Sang Hyun Lim; Ho Dong Chu; Kuk Joo Lee
- Web page: https://patentgrep.com/patent/US9437875B2

## CPC

- H01M 4/622: {being polymers}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/386: {Silicon or alloys based on silicon}
- 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 a highly elastic physically cross-linked binder induced by reversible acid-base interaction for high performance silicon anode, and more particularly to a highly elastic physically cross-linked binder induced by reversible acid-base interaction for high performance silicon anode, in which the binder has excellent stiffness and elasticity. To this end, the polymer binder that is physically crosslinked with a crosslinking agent by acid-base interaction may include a crosslinking agent that is physically bound with the binder for silicon anode by reversible acid-base interaction with the binder for silicon anode.

## Claims

### Claim 1

A highly elastic physically cross-linked binder induced by reversible acid-base interaction for high performance silicon anode, the binder comprising:
a binder for silicon anode, wherein the binder is at least one selected from the group consisting of poly(acrylic acid) (PAA), carboxymethyl cellulose (CMC), and alginate; and
a crosslinking agent that is physically bound with the binder for silicon anode by reversible acid-base interaction.

### Claim 2 (depends on 1)

The binder of claim 1, wherein the silicon anode is prepared by using silicon or silicon-graphite composite material.

### Claim 3 (depends on 1)

The binder of claim 1, wherein the crosslinking agent is basic.

### Claim 4 (depends on 3)

The binder of claim 3, wherein the crosslinking agent comprises both a hydrogen bond donor and a hydrogen bond acceptor.

### Claim 5 (depends on 3)

The binder of claim 3, wherein the crosslinking agent is at least one selected from the group consisting of poly(benzimidazole), guanidine-based polymers, imidazole-based polymers, polyaniline polymers, and polypyridine-based polymers.

### Claim 6 (depends on 1)

The binder of claim 1, wherein the binder for silicon anode is poly(acrylic acid) (PAA), and the crosslinking agent is poly(benzimidazole).

### Claim 7 (depends on 1)

The binder of claim 1, wherein the crosslinking agent is contained in an amount of 1 to 3% by weight compared to a weight of the binder for silicon anode.