SEPARATOR FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING THE SAME
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United States of America
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Issued Date -
Apr 22, 2021
app pub date -
Oct 14, 2020
filing date -
Oct 14, 2020
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Abstract
A separator for a rechargeable lithium battery including a porous substrate and a heat resistant layer on at least one surface of the porous substrate is disclosed. The heat resistant layer includes a crosslinked binder and a filler, the crosslinked binder includes a crosslinked polymer of an urethane-based compound including at least three curable functional groups and having a molecular weight of greater than or equal to about 10,000, and a (meth)acrylate-based compound including at least two curable functional groups and a molecular weight of less than or equal to about 1,000. The filler includes silica particles having a functional group on the surface. The functional group is selected from a (meth)acrylate group, a vinyl group, a hydroxy group, an epoxy group, an oxane group, an oxetane group, an ester group, and an isocyanate group. A rechargeable lithium battery including the separator is also disclosed.
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