SEPARATOR FOR POWER STORAGE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a separator for a power storage device which enables the suppression of increase in ion resistance while enhancing the adhesiveness between a separator and an electrode.SOLUTION: A separator for a power storage device comprises at least a base material including a porous film, and a thermoplastic polymer layer formed in at least a partial region of at least one face of the base material. After immersing the separator in an electrolytic solution, the aperture ratio in a projection plane per unit area of the surface of the thermoplastic polymer layer is 1-20%.SELECTED DRAWING: Figure 1