Separator for rechargeable battery and rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-2016149190-A1
Application number	US-201514945345-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Nov 21, 2014
Publication date	May 26, 2016
Grant date	—

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.

First claim

What is claimed is:

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 comprises 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.

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

3 . The separator of claim 1 , wherein the acrylic acid derivative monomer is at least one selected from a nitrile group-containing acrylic monomer, an acrylic acid ester, and acrylamide.

4 . The separator of claim 3 , wherein the nitrile group-containing acrylic monomer is at least one selected from acrylonitrile, metacrylonitrile, 2-cyanoethylacrylate, and 2-cyanoethylmetacrylate.

5 . The separator of claim 1 , wherein the carboxyl group-containing acrylic monomer comprises an alkali metal salt or an ammonium salt.

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

7 . The separator of claim 6 , wherein the non-water-soluble resin comprises polyvinylidene fluoride, a non-water-soluble acrylic resin, or a combination thereof.

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

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

10 . The separator of claim 9 , wherein the inorganic particles comprise alumina, boehmite, or a combination thereof.

11 . A rechargeable battery comprising the separator of claim 1 .

12 . The rechargeable battery of claim 11 , wherein the carboxyl group-containing acrylic monomer is at least one selected from acrylic acid, metacrylic acid, maleic acid, mono methyl maleic acid, 2-carboxylethyl acrylate, and 2-carboxylethyl methacrylate.

13 . The rechargeable battery of claim 11 , wherein the acrylic acid derivative monomer is at least one selected from a nitrile group-containing acrylic monomer, an acrylic acid ester, and acrylamide.

14 . The rechargeable battery of claim 13 , wherein the nitrile group-containing acrylic monomer is at least one selected from acrylonitrile, metacrylonitrile, 2-cyanoethylacrylate, and 2-cyanoethylmetacrylate.

15 . The rechargeable battery of claim 11 , wherein the carboxyl group-containing acrylic monomer comprises an alkali metal salt or an ammonium salt.

16 . The rechargeable battery of claim 11 , wherein the coating layer further comprises a non-water-soluble resin.

17 . The rechargeable battery of claim 16 , wherein the non-water-soluble resin comprises polyvinylidene fluoride, a non-water-soluble acrylic resin, or a combination thereof.

18 . The rechargeable battery of claim 11 , wherein the coating layer further comprises polyvinyl alcohol.

19 . The rechargeable battery of claim 11 , wherein the coating layer further comprises inorganic particles.

20 . The rechargeable battery of claim 19 , wherein the inorganic particles comprise alumina, boehmite, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Fukuchi Iwao

Classifications

• H01M50/431 Primary

  Inorganic material · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/42

  Acrylic resins · CPC title

• H01M50/417

  Polyolefins · CPC title