Separator for rechargeable battery and rechargeable battery including the same

1. A separator for a rechargeable battery, the separator comprising:

a porous substrate, and

a heat-resistant layer on at least one surface of the porous substrate

wherein the heat-resistant layer includes a compound represented by Chemical Formula 1 or a cross-linked product thereof:

(R) n1 —Ar—OH  [Chemical Formula 1]

wherein, in Chemical Formula 1,

Ar is a C6 to C20 aryl group;

n1 is an integer ranging from 5 to 19;

the Rs are the same or different and are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 cycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof; and

at least one R is a substituted or unsubstituted C2 to C50 alkenyl group.

2. The separator as claimed in claim 1 , wherein the compound represented by Chemical Formula 1 is a compound represented by Chemical Formula 1a:

wherein, in Chemical Formula 1a,

R 1 to R 5 are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 cycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof, and

at least one of R 1 to R 5 is a substituted or unsubstituted C2 to C50 alkenyl group.

3. The separator as claimed in claim 2 , wherein at least one of R 1 to R 5 of Chemical Formula 1a is a hydroxy group.

4. The separator as claimed in claim 3 , wherein R 1 of Chemical Formula 1a is a hydroxy group.

5. The separator as claimed in claim 4 , wherein R 5 of Chemical Formula 1 a is a substituted or unsubstituted C2 to C50 alkenyl group.

6. The separator as claimed in claim 1 , wherein:

the heat-resistant layer includes the cross-linked product of the compound represented by Chemical Formula 1, and

the cross-linked product of the compound represented by Chemical Formula 1 has a weight average molecular weight of about 1,000 g/mol to about 50,000 g/mol.

7. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes at least one of a cross-linkable compound differing from the compound represented by Chemical Formula 1 and a non-cross-linkable compound.

8. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes polyvinylidene fluoride (PVdF), a polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, a polyethylene-vinylacetate copolymer, polyethyleneoxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyanoethyl cellulose, cyanoethylsucrose, pullulan, carboxymethyl cellulose, an acrylonitrile-styrene-butadiene copolymer, or a combination thereof.

9. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes an inorganic filler, an organic filler, an organic/inorganic filler, or a combination thereof.

10. The separator as claimed in claim 9 , wherein:

the heat-resistant layer includes the inorganic filler, and

the inorganic filler is or includes a metal oxide, a semi-metal oxide, a metal fluoride, a metal hydroxide, or a combination thereof.

11. The separator as claimed in claim 9 , wherein:

the heat-resistant layer includes the organic filler, and

the organic filler is or includes an acrylic compound, an imide compound, an amide compound, or a combination thereof.

12. The separator as claimed in claim 9 , wherein:

the heat-resistant layer includes the inorganic filler, and

the inorganic filler is or includes Al 2 O 3 , SiO 2 , TiO 2 , SnO 2 , CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 , SrTiO 3 , BaTiO 3 , Mg(OH) 2 , Mg 3 (OH) 2 Si 4 O 10 , or a combination thereof.

13. The separator as claimed in claim 1 , wherein the porous substrate includes a polyolefin.

14. The separator as claimed in claim 1 , wherein the porous substrate includes a single layer or two or more layers.

15. A rechargeable lithium battery, comprising

a positive electrode,

a negative electrode, and

a separator as claimed in claim 1 between the positive electrode and the negative electrode.

16. A separator for a rechargeable battery, the separator comprising:

a porous substrate, and

a heat-resistant layer on at least one surface of the porous substrate

wherein the heat-resistant layer includes a compound represented by Chemical Formula 1a or a cross-linked product thereof:

wherein, in Chemical Formula 1a,

R 1 is a hydroxy group,

R 5 is a substituted or unsubstituted C2 to C50 alkenyl group, and

R 2 to R 4 are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 ycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof.