| abstract |
A separator for a secondary battery comprising a porous substrate and an adhesive layer disposed on at least one side of the porous substrate, wherein the adhesive layer includes a first binder, a second binder and a filler, wherein the first binder is a structure derived from vinylidene fluoride And a structural unit derived from hexafluoropropylene, wherein the structural unit derived from hexafluoropropylene is contained in an amount of 10% by weight or less based on the first binder, and the weight average molecular weight of the first binder is 800,000 To 1,500,000, the second binder comprises a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, and the structural unit derived from hexafluoropropylene has a structural unit derived from 10 < RTI ID = 0.0 > By weight or less, and the weight of the second binder Average molecular weight is 600,000 or less relates to a rechargeable lithium battery including this separator and a secondary battery. |