| CPC H01M 50/449 (2021.01) [C08L 79/08 (2013.01); C09D 7/65 (2018.01); C09D 7/68 (2018.01); C09D 133/02 (2013.01); C09D 133/26 (2013.01); H01M 10/0525 (2013.01); H01M 10/44 (2013.01); H01M 50/491 (2021.01); C08K 5/5406 (2013.01); C08K 5/5419 (2013.01); C08L 2207/53 (2013.01); C08L 2312/08 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] | 15 Claims |
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1. A coating layer composition for a separator of a rechargeable lithium battery, the coating layer composition comprising:
a heat-resistant binder;
a hydroxy group-containing polyimide particle;
a functional group-containing silane cross-linking agent; and
a solvent,
wherein the functional group comprises at least one selected from the group consisting of a hydroxy group, an alkoxy group, a halogen group, an amino group, a vinyl group, and a glycidoxy group,
wherein the functional group-containing silane cross-linking agent comprises at least one selected from the group′ consisting of alkylalkoxysilane, vinylalkoxysilane, glycidoxyalkylalkoxysilane, aminoalkylalkoxy silane, mercaptoalkylalkoxysilane, halogenated alkylalkoxysilane, vinylhalosilane, and alkylacyloxy silane,
wherein the functional group-containing silane cross-linking agent is included in an amount of 0.5 wt % to 10 wt % based on a total solid weight of the coating layer composition, and
wherein the hydroxy group-containing polyimide particle comprises a structural unit represented by Chemical Formula 1-5
 wherein 10≤m≤400 and 10≤l≤400, and
wherein the heat-resistant binder comprises a (meth)acrylic copolymer comprising:
a first structural unit derived from (meth)acrylamide;
a second structural unit derived from (meth)acrylic acid, (meth)acrylate or (meth)acrylonitrile; and
a third structural unit derived from (meth)acrylamidosulfonic acid or a salt of (meth)acrylamidosulfonic acid.
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