Study on PVDF-HFP Based Nanocomposite Polymer Electrolytes for Energy Storage Devices Dispersed with Various Nano-Fillers

Using the solution casting method, various compositions of nanocomposite polymer electrolyte (NCPE) films were successfully synthesised, including Polyvinylideneflouride-co-hexafluoropropylene (PVDF-HFP) as a host, Magnesium chloride (MgCl2) as an ionic salt and various concentrations of nanosized ceramic fillers -TiO2, MgO, ZnO and Al2O3. Effect of dispersion of various ceramic filler in SPE on ionic conductivity of SPE has been discussed. The best bulk conductivity ( ) achieved at room temperature for optimum conducting composition (OCC) of solid polymer electrolyte is 4.69x10-7 S/cm-phase-Ist. Further on addition of filler-phase IInd, conductivity increased and achieved highest for composition i.e. PVDF-HFP: MgCl2: ZnO (70:30:3) of NCPE is 1.25x10-5 S/cm and from temperature dependence study we got highest for OCC of NCPE at 110 0C is 1.24x10-4 S/cm. Impedance Spectroscopy was used to measure the electrical properties of all samples in the frequency range 42Hz-5MHz and the temperature range 30 -1100C. To characterise the structural properties of these NCPE films, X-ray Diffraction (XRD) was used. The ion transport number tion 0.99 for OCC of NCPE system obtained by Wagner’s dc polarization technique.