Microporous membrane, battery separator and battery

Details Microporous membrane, battery separator and battery Microporous membrane, battery separator and battery

2011-07-19

2011-07-19

Ridley, Basia (Department: 1725)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer or spacer insulating structure

C429S142000, C428S516000, C156S244110

Reexamination Certificate

active

07981536

ABSTRACT:
Disclosed herein is multi-layer, microporous polyolefin membrane comprising a first porous layer comprising primarily a polyethylene, and a second porous layer comprising a polyethylene resin and polypropylene, the polypropylene having a weight-average molecular weight of 6×105or more and a heat of fusion (measured by a differential scanning calorimeter) of 90 J/g or more, a fraction of the polypropylene having a molecular weight of 5×104or less being 5% or less by mass.

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