Separator for rechargeable lithium battery and rechargeable lithium battery comprising same

A separator for a rechargeable lithium battery, comprising

• a porous substrate, and
• an adhesive layer on the porous substrate,
• wherein the adhesive layer includes a particle-type binder having a core-shell structure including a core and a shell surrounding the core,
• the core includes a first polymer having a glass transition temperature of less than or equal to 30° C.,
• the shell includes a second polymer having a glass transition temperature of greater than or equal to 40° C.,
• the particle-type binder has a diameter of 50 nm to 500 nm, and
• wherein the particle-type binder includes one or more (meth)acrylate structural units represented by Chemical Formula 1;
• at least one selected from among a phenyl group-containing structural unit represented by Chemical Formula 2 and a cyano group-containing structural unit represented by Chemical Formula 3;
• and an ester group-containing structural unit represented by Chemical Formula 4:
• wherein, in Chemical Formula 1,
• R1 is hydrogen or a C1 to C5 alkyl group,
• R2 is a C1 to C10 alkyl group,
• * is a linking point;
• wherein, in Chemical Formula 2 to Chemical Formula 4,
• R3 to R5 are independently hydrogen or a C1 to C5 alkyl group,
• R6 is a C1 to C10 alkyl group,
• Ra to Re are independently hydrogen or a C1 to C5 alkyl group,
• L1 to L3 are independently a C1 to C5 alkyl group,
• x, y, and z are independently an integer of 0 to 2, and
• * is a linking point,
• wherein at least one selected from among the first polymer and the second polymer includes a structural unit represented by Chemical Formula 5 or Chemical Formula 6:
• wherein, in Chemical Formula 5 and In Chemical Formula 6,
• R7 and R8 are independently a C1 to C5 alkyl group,
• l and o of the first polymer are each independently 50 mol % to 60 mol %, m and p are each independently 0 mol % to 10 mol %, and n and q are each independently 30 mol % to 50 mol %,
• l and o of the second polymer are each independently 10 mol % to 30 mol %, m and p are each independently 50 mol % to 70 mol %, and n and q are each independently 10 mol % to 30 mol %, and
• * is a linking point.