SEPARATOR FOR POWER STORAGE DEVICE, POWER STORAGE DEVICE, LITHIUM ION SECONDARY BATTERY, AND COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a separator for a power storage device, which is excellent in adhesion to an electrode.SOLUTION: A separator for a power storage device comprises a base material and a layer that is formed on at least a part on at least one surface of the base material and that contains a thermoplastic polymer. In the separator for the power storage device, the thermoplastic polymer includes a copolymer having an ethylenically unsaturated monomer with a cycloalkyl group as a monomeric unit.