| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated porous film suitable as a separator for a non-aqueous electrolyte secondary battery, which excels in safety against an internal short circuit caused by penetration of a foreign substance represented by a nailing test, in a non-aqueous electrolyte secondary battery having an increased battery capacity.SOLUTION: There is provided a laminated porous film in which a porous layer containing a heat-resistant material is laminated on at least one surface of a porous layer including a polyolefin, which satisfies the following expression (I): 0.1136×α+0.0819×β+3.8034≥4.40 (I). α: the film resistance value (Ω cm) of the laminated porous film, β: the volume value (cc/m) of the heat-resistant material included per 1 mof the porous layer containing the heat-resistant material.SELECTED DRAWING: None |
