Binder and separator containing same
A binder includes a polymer and ceramic particles modified with silane coupling agent. The polymer contains structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, and a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer is (50 to 58):(40 to 44):(2 to 6). The first-type monomer is selected from one or more compounds of formula I, the second-type monomer is selected from one or more compounds of formula II, and the third-type monomer is selected from one or more compounds of formula III.
1. A binder comprising:
a polymer containing structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer being (50 to 58):(40 to 44):(2 to 6); and
ceramic particles modified with silane coupling agent;
wherein:
the first-type monomer is selected from one or more compounds of formula I:
wherein, R 1 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 2 is selected from a substituted er straight-chain C 4-15 alkyl group, a substituted branched-chain C 4-15 alkyl group, a substituted C 3-6 cycloalkyl group, and a substituted isobornyl group, a substituent group for the substituted straight-chain C 4-15 alkyl group or the substituted branched-chain C 4-15 alkyl group is a hydroxyl group, and a substituent group for the substituted C 3-6 cycloalkyl group or the substituted isobornyl group is selected from a hydroxyl group and a C 1-6 chain alkyl group;
the second-type monomer is selected from one or more compounds of formula II:
wherein, R 3 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group; and
the third-type monomer is selected from one or more compounds of formula III:
wherein, R 4 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 5 is selected from a hydrogen atom, a hydroxy C 1-6 alkyl group, and a C 1-6 alkoxy group.
2. The binder according to claim 1 , wherein:
R 1 is selected from a straight-chain or branched-chain C 2-6 alkyl group; and/or
R 3 is selected from a straight-chain or branched-chain C2-6 alkyl group; and/or
R 4 is selected from a straight-chain or branched-chain C1-6 alkyl group; and/or
R 5 is selected from a hydroxy C 2-6 alkyl group, and a C 1-4 alkoxy group.
3. The binder according to claim 1 , wherein a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer is (50 to 57):(41 to 44):(2 to 6).
4. The binder according to claim 1 , wherein the polymer has a weight-average molecular weight of 60,000 to 120,000.
5. The binder according to claim 1 , wherein the ceramic particles modified with silane coupling agent has a median particle size D v 50 of 200 nm to 980 nm.
6. The binder according to claim 1 , wherein the silane coupling agent is selected from one or more compounds of formula IV:
wherein, R 6 , R 7 , and R 8 are independently selected from a straight-chain or branched-chain C 1-6 alkyl group; R 9 is selected from a C 2-6 alkenyl group and a C 1-6 straight alkyl group, wherein at least one hydrogen atom on a carbon atom on an end of the C 1-6 straight alkyl group is substituted with a substituent group selected from amino, 2,3-epoxypropyloxy, and methacryloyloxy.
7. The binder according to claim 1 , wherein a weight ratio of the ceramic particles and the silane coupling agent is (97.5 to 99.9):(0.1 to 2.5).
8. The binder according to claim 1 , wherein a weight ratio of the polymer and the ceramic particles is (40 to 90):(10 to 60).
9. The binder according to claim 1 , wherein the polymer is applied to the ceramic particles.
10. A separator, comprising:
a base layer; and
a coating provided on at least one surface of the base layer, wherein the coating comprises the binder according to claim 1 .
11. The binder according to claim 1 , wherein:
R 1 is selected from a straight-chain or branched-chain C 2-6 alkyl group.
12. The binder according to claim 1 , wherein:
R 3 is selected from a straight-chain or branched-chain C 2-6 alkyl group.
13. The binder according to claim 1 , wherein:
R 4 is selected from a straight-chain or branched-chain C 1-6 alkyl group.
14. A binder comprising:
a polymer containing structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer being (50 to 58):(40 to 44):(2 to 6); and
ceramic particles modified with silane coupling agent;
wherein:
the first-type monomer is selected from one or more compounds of formula I:
wherein, R 1 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 2 is selected from a substituted or unsubstituted straight-chain or branched-chain C 1-15 alkyl group, a C 3-6 cycloalkyl group, and an isobornyl group, wherein in a case of substitution, a substituent group is selected from a hydroxyl group and a C 1-6 chain alkyl group;
the second-type monomer is selected from one or more compounds of formula II:
wherein, R 3 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group; and
the third-type monomer is selected from one or more compounds of formula III:
wherein, R 4 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 5 is selected from a hydroxy C 2-6 alkyl group and a C 1-6 alkoxy group.
15. A binder comprising:
a polymer containing structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer being (50 to 58):(40 to 44):(2 to 6); and
ceramic particles modified with silane coupling agent;
wherein:
the first-type monomer is selected from one or more compounds of formula I:
wherein, R 1 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 2 is selected from a substituted or unsubstituted straight-chain or branched-chain C 1-15 alkyl group, a C 3-6 cycloalkyl group, and an isobornyl group, wherein in a case of substitution, a substituent group is selected from a hydroxyl group and a C 1-6 chain alkyl group;
the second-type monomer is selected from one or more compounds of formula II:
wherein, R 3 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group;
the third-type monomer is selected from one or more compounds of formula III:
wherein, R 4 is selected from a hydrogen atom and a straight-chain or branched-chain C 1-6 alkyl group, and R 5 is selected from a hydrogen atom, a hydroxy C 1-6 alkyl group, and a C 1-6 alkoxy group; and
the silane coupling agent is selected from one or more compounds of formula IV:
wherein, R 6 , R 7 , and R 8 are independently selected from a straight-chain or branched-chain C 1-6 alkyl group, R 9 is selected from a C 1-6 straight alkyl group, and at least one hydrogen atom on a carbon atom on an end of the C 1-6 straight alkyl group is substituted with 2,3-epoxypropyloxy.
16. The binder according to claim 15 , wherein:
R9 is selected from 3-aminopropyl and 3-(2,3-epoxypropoxy) propyl.
17. A secondary battery comprising the binder according to claim 1 .
18. A battery module, comprising the secondary battery according to claim 17 .
19. A battery pack, comprising the battery module according to claim 18 .
20. An electric apparatus, comprising the secondary battery according to claim 17 .