하이드로 실릴레이션을 이용한 리튬 이차전지용 고분자막 제조 및 특성

Abstract

Crosslinked network polysiloxanes containing oligo ethylene oxide and phenol units, as internal free chains have been synthesized by hydrosilylation of polysiloxane precursor having PEO and phenol units with diallyl terminated poly(ethylene glycol). The polymer electrolytes were formed by complexing with LiClO4 electrolyte salt and exhibited lower conductive property by adding phenol units compared to them without phenols. Their mechanical properties, however, were improved by rigid aromatic structure of phenol group. The ion conductivity of the network polymer electrolytes are in the range of 6.5×10-7 to 1.3×10-5 S/cm and depends on the ratio of phenol units (in terms of Si–H amount of the siloxane precursor). The significant enhancement of the conductivity was observed when propylene carbonate was added as a plasticizer. The gel electrolyte with propylene carbonate increased the ion conductivity of 1.4×10-4 which can be used on a commercial LIPB.