Porous film composition for lithium ion secondary battery, separator with protective layer for lithium ion secondary battery, electrode with protective layer for lithium ion secondary battery, and lithium ion secondary battery

摘要

PROBLEM TO BE SOLVED: To provide a porous film composition for lithium ion secondary batteries which enables the formation of a porous film superior in strength and electrolyte diffusibility.SOLUTION: A porous film composition for lithium ion secondary batteries comprises: a non-conductive organic fiber; and particulate polymer. The non-conductive organic fiber has an average fiber diameter of 0.01-1 m. The non-conductive organic fiber and the particulate polymer each have a reactive functional group. Between the reactive functional group of the non-conductive organic fiber, and the reactive functional group of the particulate polymer, a dehydration reaction can occur.