Preparation and Characterization of Polymer Electrolytes

Abstract

Two groups of polymer electrolyte having Na+ ion as the principal charge carrier have been prepared and analyzed with different experimental conditions. In the present study, sodium perchlorate (NaClO4) as the salt and two different polymers (i.e. Polyethylene Oxide (CH2 -CH2-O) and Polyurethane (RNHCOOR′)) as polymer host were taken for polymer-salt complexation. The polymer electrolytes were prepared by the solution cast method having different O/Na ratio (O/Na=0, 4, 8, 20, 40, 60, 80, 100). The structural and microstructural characterization has been carried out using X-ray diffraction (XRD) and Scanning electron microscopy (SEM) analysis. XRD analysis shows the formation of polymer-salt complex with the existence of both crystalline and amorphous phases in the materials. Again the formation of salt-polymer complexation has been confirmed by FTIR analysis by observing the COC stretching modes. The electrical property of the polymer electrolytes were carried out using complex impedance analysis in the frequency range of 100 mHz to 1 MHz at room temperature. AC conductivity, dielectric property and impedance data were presented with respect to different frequency and different compositions.