PET nonwoven fabric for separator for secondary battery and separator for secondary battery comprising the same
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United States of America Patent
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Nov 29, 2016
Grant Date -
Aug 6, 2015
app pub date -
Nov 9, 2012
filing date -
Oct 25, 2012
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Abstract
A PET nonwoven fabric for a separator for a secondary battery includes first fibers composed of PET having a melting temperature of 240° C. or more and second fibers composed of PET having a melting temperature of 180˜220° C., respective fibers having two types of fibers having different diameters, and has a fine pore size and uniform pore distribution and exhibits superior surface properties, low surface defects, high mechanical strength and excellent mass production. Even when the temperature of a battery is increased to 200° C. or more, the PET nonwoven fabric has heat resistance which prevents thermal runaway and does not generate melting and shrinking.
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