SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Mar 1, 2018
app pub date -
Aug 29, 2017
filing date -
Aug 31, 2016
priority date (Note) -
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Abstract
A nonaqueous electrolyte secondary battery which includes, as a nonaqueous electrolyte secondary battery separator or as a base material of a nonaqueous electrolyte secondary battery laminated separator, a porous film containing a polyolefin-based resin as a main component and containing phosphoric esters in an amount of not less than 5 ppm and not more than 700 ppm in terms of a mass ratio relative to total mass of the porous film is excellent in rate characteristic maintaining property.
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