Polysiloxane-based compound and solid polymer electrolyte composition using the same
View Patent ↗This invention relates to a polysiloxane-based compound and a solid polymer electrolyte composition prepared using the same. More particularly, the present invention relates to a polysiloxane-based polymer, which promotes easy cross-linking and also enables to control the level of cross-linking according to the concentration of an acryl group by introducing a polyalkyleneoxide group and an acryl group are introduced as side chains to the backbone of methylsiloxane polymer.
1. A polysiloxane-based compound having the following structure 1 wherein a polyalkyleneoxide group and an acryl group are introduced as side chains to the backbone of methylsiloxane polymer,
wherein R 1 , R 2 and R 3 are independently a hydrogen atom or a methyl group; n and m are independently an integer of from 1 to 1,000; p and q are independently an integer of from 0 to 20 with the proviso that p and q are not 0 simultaneously; and r is an integer of from 1 to 20.
2. A polysiloxane-based cross-linker for solid polymer electrolyte having the following structure 1 wherein a polyalkyleneoxide group and an acryl group are introduced as side chains to the backbone of methylsiloxane polymer,
wherein R 1 , R 2 and R 3 are independently a hydrogen atom or a methyl group; n and m are independently an integer of from 1 to 1,000; p and q are independently an integer of from 0 to 20 with the proviso that p and q are not 0 simultaneously; and r is an integer of from 1 to 20.
3. A solid polymer electrolyte composition comprising:
(a) about 0.1 to 95 wt. % of a cross-linker having the following structure 1,
(b) about 0.1 to 95 wt. % of at least one thermoplastic agent selected from the group consisting of polyalkyleneglycol dialkyl ether having the following structure 2, polymethyl(polyalkyleneoxide)siloxane having the following structure 3, and a non-aqueous polar solvent;
(c) about 3 to 40 wt. % of a lithium salt; and
(d) about 0.1 to 5 wt. % of a curable initiator,
wherein R 1 , R 2 and R 3 are independently a hydrogen atom or a methyl group; n and m are independently an integer of from 1 to 1,000; p and q are independently an integer of from 0 to 20 with the proviso that p and q are not 0 simultaneously; and r is an integer of from 1 to 20; and
wherein R 4 and R 5 are independently a C 1 -C 10 linear or branched alkyl group; R 6 , R 7 and R 8 are independently a hydrogen atom or a methyl group; o, p and q are independently an integer of from 0 to 20 with the proviso that o, p and q are not 0 simultaneously;
wherein R 9 and R 10 are independently a hydrogen atom or a methyl group; x is an integer of from 1 to 1,000; p and q are independently an integer of from 0 to 20 with the proviso that p and q are not 0 simultaneously.
4. A solid polymer electrolyte thin film manufactured by coating the solid polymer electrolyte composition of claim 3 .
5. A solid polymer electrolyte for small-sized lithium-polymer secondary batteries manufactured so that it comprises the solid polymer electrolyte composition of claim 3 .
6. A solid polymer electrolyte for large capacity lithium-polymer secondary batteries manufactured so that it comprises the solid polymer electrolyte composition of claim 3 .