폴리에틸렌옥사이드계 고체 고분자전해질의 특성에 미치는 과불화폴리에테르 첨가 효과

Abstract

We studied perfluoropolyether addition effect on the properties of poly(ethylene oxide)-based solid polymer electrolytes (SPE). PFPE/PEO PU prepared with 1/99, 5/95, 10/90, and 20/80 of PFPE/PEO wt. ratio. PFPE/PEO PU/LiCF3SO3 was prepared from lithium trifluoromethane sulfonate (LiCF3SO3). The glass transition temperatures (Tg) and melting temperatures (Tm) of PEO phases from differential scanning calorimetric analysis (DSC) were similar in salt-free PFPE/PEO PU series regardless of PFPE/PEO wt. ratio. In a series of PFPE/PEO PU/LiCF3SO3, Tg of PEO phase slightly increased with increasing PFPE contents. In both series of PFPE/PEO PU and PFPE/PEO PU/LiCF3SO3, the surface energies calculated by contact angle decreased with the increase of PFPE contents due to PFPE phase localized on the surface. Thermal stability from thermogravimetric analysis (TGA) was slightly decreased with increasing PFPE contents in both PFPE/PEO PU and PFPE/PEO PU/LiCF3SO3. Ionic conductivity of PFPE/PEO PU/LiCF3SO3 was slightly increased with the increase of PFPE contents.