synthesis and characterization of polymer gel electrolyte

Abstract

A series of polymer gel electrolyte with a wide range of concentrations of solvent to salt ratio have been prepared by the gelation method with suitable choice of polymer (PVdF), solvent (DMF) and salt (NaI). The presence of both crystalline and amorphous phases (i.e. semi-crystalline nature) was observed from XRD graph. Further this observation was confirmed by SEM micrographs. The dielectric and electrical properties of the material were studied by the dielectric spectroscopic technique in a wide frequency range at room temperature. The relative dielectric constant decreases with increase in frequency. The graph of a.c. conductivity versus frequency for different concentrations showed a frequency independent plateau in the higher frequency region and dispersion in the lower frequency region. The complex impedance plot explained the bulk properties of the material in the high frequency region which further helped in calculating the d.c. conductivity.