SEPARATOR AND NONAQUEOUS ELECTROLYTE BATTERY PREPARED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide a separator preventing the life of a battery from decreasing and achieving a high level of safety, and to provide a nonaqueous electrolyte battery prepared therewith.

SOLUTION: A microporous film 35 has surface roughness in maximum height being 30% of the film thickness or lower in the case where the film thickness is in the range of 5 to 12 μm, or surface roughness in maximum height being 4 μm or lower in the case where the film thickness is thicker than 12 μm and is 25 μm at the maximum. The pore number N calculated using the formula (1) is 200 per 1 μm2or greater. N=(ε×L×S)/äπ×(d/2)2×τ×L} (1) (ε: porosity, L: film thickness (μm), S: area (μm2), d: average pore diameter (μm), and τ: tortuosity).

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