Battery separators with reduced splitting propensity

Details Battery separators with reduced splitting propensity Battery separators with reduced splitting propensity

B - Operations, Transporting

01

D

B01D 71/26 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2314455

A split resistant microporous membrane is provided for use in preparing a battery separator. The microporous membrane has a TD tensile strength to MD tensile strength ratio of from about 0.12 to about 1.2, preferably from about 0.5 to about 1. The microporous membrane is made by a process which includes the steps of preparing a film precursor by blown film extrusion at a blow-up ratio of at least 1.5, annealing the film precursor, and stretching the resultant annealed film precursor to form the microporous membrane.

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