Separator for rechargeable battery and rechargeable battery including the same

A separator for a rechargeable battery, the separator comprising:

• a porous substrate, and a coating layer located on at least one surface of the porous substrate,
• wherein the coating layer comprises a crosslinked product of a mixture of a first binder and a second binder and a crosslinking agent, and a mixture of a first filler and a second filler, and
• wherein the first binder is an aqueous binder,
• the second binder comprises a carboxyalkyl cellulose-based compound or a salt thereof,
• the crosslinking agent comprises citric acid,
• the citric acid is included in a range of about 5 parts by weight to about 50 parts by weight with respect to 100 parts by weight of the total of the first binder and the second binder,
• the second filler comprises a fibrous filler, and
• the weight ratio of the second filler to the first filler is in a range of about 1:1 to about 1:200.

A separator for a rechargeable battery, the separator comprising:

• a porous substrate, and a coating layer located on at least one surface of the porous substrate,
• wherein the coating layer comprises a crosslinked product of a mixture of a first binder and a second binder and a crosslinking agent, and a filler,
• wherein the first binder is an aqueous binder, and the second binder comprises a carboxyalkyl cellulose-based compound or a salt thereof,
• the crosslinking agent comprises a mixture of citric acid and an aziridine-based crosslinking agent, and
• the citric acid and the aziridine-based crosslinking agent are included at a weight ratio in a range of about 80:20 to about 20:80 with respect to 100 parts by weight of the mixture of the citric acid and the aziridine-based crosslinking agent.