BATTERY SEPARATOR AND METHOD OF PRODUCING THE SAME
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United States of America Patent
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Issued Date -
May 5, 2016
app pub date -
Aug 25, 2014
filing date -
Aug 30, 2013
priority date (Note) -
Abandoned
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Abstract
A battery separator which is a laminated polyolefin microporous membrane, comprising a polyolefin microporous membrane, and a modifying porous layer comprising a water-soluble resin or water-dispersible resin, and fine particles, the modifying porous layer being laminated on at least one surface of the polyolefin microporous membrane, wherein the polyolefin microporous membrane comprises a polyethylene resin and has (a) a shutdown temperature (a temperature at which an air resistance measured while heating the polyolefin microporous membrane at a temperature rise rate of 5° C./min reaches 1×105 sec/100 cc) of 135° C. or lower, (b) a rate of air resistance change (a gradient of a curve representing dependency of the air resistance on temperature at an air resistance of 1×104 sec/100 cc) of 1×104 sec/100 cc/° C. or more, (c) a transverse shrinkage rate at 130° C. (measured by thermomechanical analysis under a load of 2 gf at a temperature rise rate of 5° C./min) of 20% or less, and a thickness of 16 μm or less, the shutdown temperature difference between the polyolefin microporous membrane and the laminated polyolefin microporous membrane being 4.0° C. or less. A method of producing the same.
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