| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery separator low in internal resistance of a battery and excellent in durability.SOLUTION: In a battery separator having a porous film layer containing a porous support body and inorganic fine particles, the inorganic fine particles are aluminum oxide-based composites obtained by hydrothermal synthesis and represented by AlO(OH)(1.0<x≤1.3, 0.4≤y<1.0, 2x+y=3). |
