| abstract |
The purpose is to provide a laminated porous film having shutdown characteristics, which are important in terms of ensuring safety, while also having excellent air permeation performance, which contributes to electrical performance, when used as a separator for a battery. The present invention is a laminated porous film characterized by comprising: a porous film layer having a thickness of 10 µm or more, the main component thereof being a thermoplastic resin composition having a crystal-melting peak temperature of 150−250°C; and a nonwoven fiber layer having a fiber diameter of 1 µm or less, the main component thereof being a thermoplastic resin composition having a crystal-melting peak temperature of 100°C to less than 150°C; the air permeability of the laminated porous film being 10−10,000 s/100 mL. |