Studies on conductivity and dielectric properties of PEO/PVP nanocomposite electrolytes for energy storage device applications

Investigations on sodium-ion conducting polymer blend electrolyte systems based on PEO/ PVP, complexed with NaIO4 salt and TiO2 nanofiller, are presented in this report. The complexed polymer blend electrolytes were prepared in the form of dimensionally stable and free-standing films by conventional solution cast technique. Micro Raman and XRD studies confirmed the miscibility between PEO and PVP and the complexation of the salt with PEO/PVP polymer host. TEM measurements were carried out to evaluate size & distribution of the dispersed TiO2 nanofiller. Complex impedance spectroscopy was performed in the 1 Hz – 1 MHz frequency range within the temperature range from room temperature to 343 K. Ionic conductivity of blend electrolytes increased with the increase of TiO2 nanofiller concentration. Electrical conductivity and dielectric properties of NaIO4 salt-complexed blend PEO/PVP/Na+ electrolytes were analyzed as a function of TiO2 nanofiller concentration.