CPC H01M 50/417 (2021.01) [H01M 4/622 (2013.01); H01M 10/0525 (2013.01); H01M 50/409 (2021.01); H01M 50/42 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/461 (2021.01); H01M 50/489 (2021.01)] | 13 Claims |
1. A separator for a rechargeable lithium battery, comprising
a porous substrate, and
an adhesive layer on the porous substrate,
wherein the adhesive layer includes a particle-type binder having a core-shell structure including a core and a shell surrounding the core,
the core includes a first polymer having a glass transition temperature of less than or equal to 30° C.,
the shell includes a second polymer having a glass transition temperature of greater than or equal to 40° C.,
the particle-type binder has a diameter of 50 nm to 500 nm,
wherein the particle-type binder includes one or more (meth)acrylate structural units represented by Chemical Formula 1; at least one selected from among a phenyl group-containing structural unit represented by Chemical Formula 2 and a cyano group-containing structural unit represented by Chemical Formula 3; and an ester group-containing structural unit represented by Chemical Formula 4:
![]() wherein, in Chemical Formula 1,
R1 is hydrogen or a C1 to C5 alkyl group,
R2 is a C1 to C10 alkyl group,
* is a linking point;
![]() wherein, in Chemical Formula 2 to Chemical Formula 4,
R3 to R5 are independently hydrogen or a C1 to C5 alkyl group,
R6 is a C1 to C10 alkyl group,
Ra to Re are independently hydrogen or a C1 to C5 alkyl group,
L1 to L3 are independently a C1 to C5 alkyl group,
x, y, and z are independently an integer of 0 to 2, and
* is a linking point, and
wherein the first polymer includes 0 to 0.2 mole of the phenyl group-containing structural unit represented by Chemical Formula 2 or the cyano group-containing structural unit represented by Chemical Formula 3 and 0.5 mole to 0.8 mole of the ester group-containing structural unit represented by Chemical Formula 4 based on 1 mole of the (meth)acrylate structural unit represented by Chemical Formula 1.
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