Polyolefin Microporous Membrane and Separator For Lithium Ion Secondary Battery
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United States of America Patent
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app pub date -
Jul 26, 2013
filing date -
Dec 19, 2008
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Abstract
A polyolefin microporous membrane that can realize a lithium ion secondary battery having favorable resistance against foreign matters or the like, and high cycle characteristics at a high temperature is provided. The present invention provides a polyolefin microporous membrane having a ratio of tensile strength in a length direction to that in a width direction of 0.75 to 1.25, and a thermal shrinkage rate in the width direction at 120° C. of less than 10%.
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