# US 10,319,972 B2 · Separator for rechargeable battery and rechargeable battery including the same

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- Number: US 10,319,972 B2
- Document ID: US10319972B2
- Status: Granted
- Kind: B2
- Application number: 14/945,345
- Filed: 2015-11-18
- Published: 2016-05-26
- Granted: 2019-06-11
- Earliest claimed: 2014-11-21
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Iwao Fukuchi
- Web page: https://patentgrep.com/patent/US10319972B2

## CPC

- H01M 50/431: Inorganic material
- H01M 50/417: Polyolefins
- H01M 50/42: Acrylic resins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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 separator for a rechargeable battery includes a substrate and a coating layer on at least one surface of the substrate, wherein the coating layer includes a binder including an acrylic resin, the binder including the acrylic resin includes a carboxyl group-containing acrylic monomer and an acrylic acid derivative monomer, and the carboxyl group-containing acrylic monomer and the acrylic acid derivative monomer are present in a mole ratio of about 20:80 to about 80:20. The binder for a rechargeable battery has high heat resistance and strong adherence, and improves the cycling characteristics of the battery.

## Claims

### Claim 1

A separator for a rechargeable battery, comprising:
a substrate and a coating layer on at least one surface of the substrate,
wherein:
the coating layer comprises a binder including an acrylic resin,
the binder including the acrylic resin is a copolymerization acrylic resin in which a carboxyl group-containing acrylic monomer and an acrylic acid derivative monomer are copolymerized,
the carboxyl group-containing acrylic monomer comprises an alkali metal salt or an ammonium salt,
the acrylic resin comprises the alkali metal salt or the ammonium salt,
the acrylic acid derivative monomer is at least one selected from acrylonitrile, methacrylonitrile, 2-cyanoethylacrylate, 2-cyanoethylmethacrylate, isobornyl acrylate, 2,2,2-trifluoroethylacrylate, methyl (meth)acrylate, butyl (meth)acrylate, ethyl (meth)acrylate, 2-ethylhexyl(meth)acrylic acid, hydroxyethyl acrylate, 1H,1H-pentafluoropropyl acrylate, 2,2,3,3-tetrafluoropropyl acrylate, polyadamantyl acrylate, and acrylamide, and
the carboxyl group-containing acrylic monomer and the acrylic acid derivative monomer are present in a mole ratio of about 20:80 to about 80:20.

### Claim 2 (depends on 1)

The separator of claim 1, wherein the carboxyl group-containing acrylic monomer comprises at least one selected from acrylic acid, methacrylic acid, maleic acid, mono methyl maleic acid, 2-carboxylethyl acrylate, and 2-carboxylethyl methacrylate.

### Claim 3 (depends on 1)

The separator of claim 1, wherein the coating layer further comprises a non-water-soluble resin.

### Claim 4 (depends on 3)

The separator of claim 3, wherein the non-water-soluble resin comprises polyvinylidene fluoride, a non-water-soluble acrylic resin, or a combination thereof.

### Claim 5 (depends on 1)

The separator of claim 1, wherein the coating layer further comprises polyvinyl alcohol.

### Claim 6 (depends on 1)

The separator of claim 1, wherein the coating layer further comprises inorganic particles.

### Claim 7 (depends on 6)

The separator of claim 6, wherein the inorganic particles comprise alumina, boehmite, or a combination thereof.

### Claim 8 (depends on 1)

A rechargeable battery comprising the separator of claim 1.

### Claim 9 (depends on 8)

The rechargeable battery of claim 8, wherein the carboxyl group-containing acrylic monomer comprises at least one selected from acrylic acid, methacrylic acid, maleic acid, mono methyl maleic acid, 2-carboxylethyl acrylate, and 2-carboxylethyl methacrylate.

### Claim 10 (depends on 8)

The rechargeable battery of claim 8, wherein the coating layer further comprises a non-water-soluble resin.

### Claim 11 (depends on 10)

The rechargeable battery of claim 10, wherein the non-water-soluble resin comprises polyvinylidene fluoride, a non-water-soluble acrylic resin, or a combination thereof.

### Claim 12 (depends on 8)

The rechargeable battery of claim 8, wherein the coating layer further comprises polyvinyl alcohol.

### Claim 13 (depends on 8)

The rechargeable battery of claim 8, wherein the coating layer further comprises inorganic particles.

### Claim 14 (depends on 13)

The rechargeable battery of claim 13, wherein the inorganic particles comprise alumina, boehmite, or a combination thereof.