Separator for rechargeable battery and rechargeable battery including the same

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.