Dielectric properties of Polymer Electrolyte

Abstract

A series of polymer electrolyte having Na+ ion as the principal charge carrier has been prepared by solution casting technique and analyzed with different experimental techniques. In the present study, sodium iodide (NaI) was taken as the salt and poly (ethylene oxide), PEO was taken as the polymer host for polymer-salt complexation. Solution cast method was used to prepare polymer electrolytes of different polymer to salt ratio (O/Na= 0, 20, 40, 60, 80, 100). The structural characterization was carried out using X-ray diffraction. The XRD pattern showed the formation of polymer-salt complexation with the existence of both crystalline and amorphous phases in the materials. This semicrystalline nature of polymer electrolyte was observed by microstructural characterization using Scanning Electron Microscope. The electrical properties of polymer electrolytes were carried out using complex impedance analysis in the frequency range of 100 mHz to 1MHz at room temperature. Dielectric properties, a.c. conductivity and impedance data were analyzed with respect to different frequency and different compositions.