SEPARATOR FOR SECONDARY BATTERY AND SECONDARY BATTERY INCLUDING THE SAME

Disclosed is a separator for a secondary battery, including: a porous polymer substrate having a plurality of pores; and a porous coating layer disposed on at least one surface of the porous polymer substrate and including a plurality of inorganic particles and a urethane bond-containing crosslinked polymer, wherein the urethane bond-containing crosslinked polymer is disposed partially or totally on the surfaces of the inorganic particles so that the inorganic particles may be interconnected and fixed, and the urethane bond-containing crosslinked polymer has a glass transition temperature (Tg) of-15 to 32°C. A secondary battery including the separator is also disclosed.