LITHIUM BATTERY SEPARATOR WITH SHUTDOWN FUNCTION
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United States of America Patent
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Issued Date -
Jan 24, 2013
app pub date -
Jan 19, 2012
filing date -
Jan 19, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This invention relates to separators for batteries and other electrochemical cells, especially lithium-ion batteries, having a shutdown mechanism. The separator is a laminate that contains a nonwoven nanoweb and a porous layer composed of a plurality of thermoplastic particles having particle size smaller than the mean flow pore size of the nanoweb. The shutdown layer melts and starts to flow at a desired temperature, and restricts the ion flow path, resulting in a substantial decrease in ionic conductivity of the separator at the desired shutdown temperature, while leaving the separator intact.
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