Separator for lithium ion secondary battery, method for manufacture thereof, and lithium ion secondary battery
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United States of America Patent
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Jun 3, 2014
Grant Date -
Jul 14, 2011
app pub date -
Sep 11, 2009
filing date -
Sep 12, 2008
priority date (Note) -
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Abstract
Disclosed are a separator for lithium ion secondary batteries, having an inorganic layer formed from inorganic particles, characterized in that the inorganic particles have a particle diameter distribution in which the 50% cumulative particle diameter D50 is in the range of 100 nm to 500 nm, the 10% cumulative particle diameter D10 is 0.5D50 or more, and the 90% cumulative particle diameter D90 is 2D50 or less; a method for manufacturing the separator; and a lithium ion secondary battery using the separator. When the separator is used, there can be produced a lithium ion secondary battery in which a short circuit caused by contraction or melting can be definitely prevented, as well as the current density applied to the electrodes during charging and discharging is uniform so that charging and discharging can be efficiently achieved.
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