| 摘要 |
<p>A separator for nonaqueous secondary batteries, which is formed of a composite membrane that is provided with: a porous base that contains a thermoplastic resin; and a heat-resistant porous layer that is provided on one surface or both surfaces of the porous base and contains an organic binder and an inorganic filler. The composite membrane has a tortuosity of from 1.5 to 2.0 (inclusive).</p> |
