| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound porous film and a method for manufacturing the same, having both a shutdown function and a heat-resistant shape holding function, and without jeopardizing film usage characteristics of ventilation, quality of a film material of film stability and surface smoothness or the like, charge and discharge characteristics, and durability or the like.SOLUTION: The compound porous film includes a polyimide layer and a porous film with ventilation, with a thickness of the film of 4 to 300 μm, a ventilation resistance in Gurley values of 10 to 1,000 sec/100 cc. The polyimide layer itself does not have ventilation, and two-dimensionally covers at least one of the surfaces of the porous film, and is formed in a two-dimensional pattern having a number of openings making the porous film exposed on the surface. |
