| abstract |
A separator for a rechargeable lithium battery and a rechargeable lithium battery, the separator including a substrate, and a heat-resistant porous layer on at least one side of the substrate, the heat-resistant porous layer including an imide-based copolymer, wherein the imide-based copolymer includes a first repeating unit represented by Chemical Formula 1 and a second repeating unit represented by Chemical Formula 2: |