SEPARATOR FOR RECHARGEABLE BATTERY AND LITHIUM RECHARGEABLE BATTERY COMPRISING SAME

Provided is a separator for a rechargeable battery, including a porous substrate and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a binder including a fluorine-based binder and a (meth)acryl-based binder, and a filler, the fluorine-based binder includes a first structural unit derived from vinylidene fluoride and a second structural unit derived from at least one monomer of hexafluoropropylene, chlorotrifluoroethylene, trifluoroethylene, ethylene tetrafluoride, and ethylene monomers, and 10 wt% or less of the second structural unit is included based on the fluorine-based binder, the fluorine-based binder includes a first fluorine-based binder having a weight average molecular weight of 800,000 to 1,500,000 and a second fluorine-based binder having a weight average molecular weight of less than or equal to 600,000, and the (meth)acryl-based binder has pencil hardness of 5H or higher.