Dielectric properties of polymer electrolyte

Abstract

The preliminary structural, microstructural and dielectric properties of the polymer electrolytes based on Polyethylene oxide (PEO) as polymer and Sodium Iodide (NaI) as salt were investigated. The samples were prepared by solution cast method by taking different concentration of O/Na ratio (i.e., O/Na =0, 20, 40, 60, 80, 100). The structural characterization was carried out by using X ray diffraction (XRD) technique which shows that the polymer electrolyte is semi-crystalline in nature. From the XRD data the crystallite size and inter planar spacing of the polymer electrolyte were also calculated. The surface morphology was analysed by Scanning electron microscope (SEM) which shows the presence of spherulites which is the crystalline phase and it is separated by amorphous boundary. The electrical properties of the polymer electrolyte were studied using complex impedance analysis. In order to optimize the conductivity and dielectric properties, dielectric parameter, ac conductivity, and impedance of the polymer electrolyte samples were analysed.