Polyolefin and ceramic battery separator for non-aqueous battery applications
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United States of America Patent
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Nov 6, 2012
Grant Date -
Jul 14, 2011
app pub date -
Mar 5, 2007
filing date -
Mar 5, 2007
priority date (Note) -
Expired
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Abstract
A ceramic microporous polyolefin battery separator membrane, high in air permeability, low in shrinkage and improved temperature resistance addresses the safety requirements of lithium ion batteries. The separators made by the current invention consists of one or more polyolefin polymers and kaolin fillers comprised of aluminum oxide and silicon oxide. The membranes of current invention have a thickness of 5-200 microns, air permeability of 1-200 sec/10 cc (Gurley seconds), and average pore diameter of less than 1 micron.
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