| CPC H01M 50/446 (2021.01) [H01M 10/052 (2013.01); H01M 50/403 (2021.01); H01M 50/42 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01)] | 10 Claims |
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1. A separator for a lithium secondary battery comprising:
a porous substrate; and
a coating layer comprising a binder and inorganic particles formed on one surface or both surfaces of the porous substrate,
wherein the binder is a binder comprising: (a) 68 to 93 mol % of a (meth)acrylamide-based monomer polymerization unit, (b) 6 to 31 mol % of a (meth)acryl-based monomer polymerization unit containing a hydroxyl group, and (c) 0.005 to 0.041 mol % of a polyfunctional (meth)acrylamide-based monomer polymerization unit,
wherein (b) the (meth)acryl-based monomer polymerization unit containing a hydroxyl group is represented by the following Chemical Formula 2:
 wherein
R2 is hydrogen or a C1 to C6 alkyl group, and
L1 is a linear or branched C1 to C6 alkylene group.
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10. A method of producing a separator for a lithium secondary battery, the method comprising:
(s1) preparing a slurry composition comprising a binder and inorganic particles; and
(s2) applying the slurry composition on one surface or both surfaces of a porous substrate to form a coating layer,
wherein the binder is a binder comprising: (a) 66 to 93 mol % of a (meth)acrylamide-based monomer polymerization unit, (b) 6 to 31 mol % of a (meth)acryl-based monomer polymerization unit containing a hydroxyl group, and (c) 0.005 to 0.041 mol % of a polyfunctional (meth)acrylamide-based monomer polymerization unit,
wherein (b) the (meth)acryl-based monomer polymerization unit containing a hydroxyl group is represented by the following Chemical Formula 2:
 wherein
R2 is hydrogen or a C1 to C6 alkyl group, and
L1 is a linear or branched C1 to C6 alkylene group.
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