Impedance study of PVA/PEG/LiClO_4/TiO_2 nanocomposite solid polymer blend electrolyte

摘要

Composite solid polymeric electrolytes (CSPE) of PVA/PEG/LiClO_4 and nanocomposite solid polymeric electrolytes (NSPE) of PVA/PEG/LiClO_4/TiO_2 films were prepared via solution casting technique using water as the solvent. TiO_2 nano powder was prepared from the sulfate process and characterized by the XRD and SEM techniques. The structural interactions of the prepared films were studied by FTIR. Ionic conductivity of the prepared CSPE and NSPE films were measured using AC impedance method at a wide temperature range from 298.15 to 348.15 K in frequency range 50-100 MHz. The measured ionic conductivity results from Nyquist plot were compared with calculations results from equivalent circuit model. The temperature dependence of ionic conductivity of the prepared CSPE and NSPE films was expressed by Arrhenius model and the ionic conductivity activation energy was reported to be 0.86 and 0.89 eV respectively.