Effect of Al₂O₃ on structural and dielectric properties of PVP-CH₃COONa based solid polymer electrolyte films for...

Nanocomposite polymer (NCP) films were prepared by doping sodium acetate (CH₃COONa) in polymer of polyvinyl pyrrolidone (PVP) by complete dispersion of aluminum oxide (Al₂O₃) with different wt% proportions using solution cast method. The acquired NCP films were systematically characterized. The crystalline structure of the prepared NCP films was confirmed by XRD. The little agglomeration and grain sizes involved in the films were analyzed by SEM. The chemical bond formation and interchange reaction between the host, dopant salt and the nanofiller were confirmed by FTIR and Raman. The lowest energy bandgap values were observed to be 3.0 eV for the synthesized film with wt% ratio of PVP + CH₃COONa:Al₂O₃ (80:20:1%). The highest ionic conductivity was found to be 1.05 × 10^-3 S/cm for the prepared film with wt% ratio of PVP + CH₃COONa:Al₂O₃ (80:20:1%). From the charge discharge characteristics it was concluded that the film with wt% ratio of PVP + CH₃COONa:Al₂O₃ (80:20:1%) possesses long durability when compared to the other prepared films.