Separator for lithium secondary battery, and lithium secondary battery comprising same

A separator for a lithium secondary battery, comprising

• a substrate, and
• a heat-resistance porous layer disposed on at least one surface of the substrate and including a cross-linked binder
• wherein the cross-linked binder has a cross-linking structure formed from a compound represented by Chemical Formula 2.
• wherein, in Chemical Formula 2,
• X1 to X3 are an oxyethylene group, respectively,
• X4 is an oxyethylene group or a C1 to C10 alkyl group, when X4 is the oxyethylene group, n4 is an integer ranging from 1 to 10 and m is 1 and when X4 is the C1 to C10 alkyl group, n4 is 1 and m is 0,
• R1 to R4 are a functional group of a (meth)acrylate group, a hydroxy group, a carboxyl group, an ester group, a cyanate group, an isocyanate group, an amino group, a thiol group, a C1 to C10 alkoxy group, a vinyl group, or a heterocyclic group,
• each of a1 to a4 are an integer ranging from 1 to 10,
• each of n1 to n3 are an integer ranging from 0 to 10, and at least one of n1 to n4 is an integer ranging from 1 to 10.