Effects of the Addition of TiO{sub}2 Nanoparticles for Polymer Electrolytes Based on Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethylene oxide-co-ethylene carbonate) Membranes

摘要

We have attempted to combine a typical gel and a typical solvent-free polymer electrolyte through the conception of a pore-filling polymer electrolyte; instead of organic solvents, a viscous poly(ethylene oxide-co-ethylene carbonate) (P(EO-EC))/LiCF{sub}3SO{sub}3/TiO{sub}2 electrolyte mixture is filled into the pores of a porous poly(vinylidene fluorideco-hexafluoropropylene) (P(VdF-HFP))/P(EO-EC)/TiO{sub}2 membrane. The porous membrane with 10 wt% TiO{sub}2 showed better performance (e.g., high uptake and good mechanical strength) than the others and was therefore selected as an optimal matrix to prepare a polymer electrolyte. All polymer electrolytes obeyed Arrhenius behavior and showed linear enhancement of ionic conductivity with increasing the temperature. In addition, maximum conductivity of 4.7 × 10{sup}(-5) S cm{sup}(-1) at 25°C was obtained for the polymer electrolyte containing 1.5 wt% TiO{sub}2 in electrolyte mixture.