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

摘要

PROBLEM TO BE SOLVED: To provide a separator for power storage devices which is superior in adhesion with an electrode.SOLUTION: A separator for power storage devices comprises: a base material; and a layer formed on at least one part on at least one side of the base material and including a thermoplastic polymer. The thermoplastic polymer includes a copolymer having, as monomer units, 2-66 mass% of an ethylenic unsaturated monomer having a chain alkyl group with 8 or more carbon atoms, and 34-98 mass% of other monomers copolymerizable with the ethylenic unsaturated monomer having a chain alkyl group with 8 or more carbon atoms.