Studies on electrochemical behaviour of PVdF-HFP based ionic liquid gel polymer electrolyte

Abstract

Ionic liquid gel polymer electrolyte (ILGPE) film consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) and 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] with different composition ratio were prepared through solution casting technique. The prepared films were subjected to impedance, temperature dependence, and total ionic transference number analysis. Ionic conductivity for each ILGPEs were measured at room temperature and with increasing temperature ranging from 303 to 373K. The maximum room temperature ionic conductivity is found to be 2.84 × 10-3 S cm-1 for film containing 60% composition ratio of [Bmim][BF4]. Temperature dependence analysis showed that the ionic conductivity of the ILGPEs increased with increasing temperature and seem to obey Arrhenius behaviour. Total ionic transference number showed that ions are the major charge carriers in this system.