Separator for rechargeable battery and rechargeable lithium battery including the same

A separator for a rechargeable battery, the separator comprising:

• a porous substrate and an adhesive layer on at least one surface of the porous substrate, wherein:
• the adhesive layer includes a first binder, a second binder, and a filler,
• the first binder includes a structural unit derived from vinylidene fluoride, a structural unit derived from a monomer having at least one hydroxy group, and a structural unit derived from hexafluoropropylene, the structural unit derived from hexafluoropropylene being included in an amount in a range of 5% or greater to less than or equal to about 10 wt % based on a total weight of the first binder, and a weight average molecular weight of the first binder ranging from about 800,000 to about 1,500,000, and
• the second binder includes a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the structural unit derived from hexafluoropropylene being included in an amount in a range that is 5% or greater and less than 10 wt % based on a total weight of the second binder, and a weight average molecular weight of the second binder being less than 500.000.