Studies of composite films of polyethylene oxide doped with potassium hexachloroplatinate

Abstract

AbstractThe permittivity and conductivity relaxation processes of polyethylene oxide (PEO) composite along with potassium hexachloroplatinate (K2PtCl6) electrolytes additive forming PEO/K2PtCl6 complex composite have been investigated. The complex composite has been used as a model for dry‐polymer electrolytes (PEs) due to the fact that, the anion is large enough for mimicking the immobilized anion in real dry‐polymer electrolytes. Stand‐free composite films with 0%, 1%, 3%, and 5% concentrations of K2PtCl6 have been studied using broadband dielectric spectroscopy in the temperatures range from 150 K until 345 K. The microstructural dynamics revealed the α‐, β‐, and σ‐relaxations and their salient spectral characteristics at various concentrations of K2PtCl6 in PEO. The experimental ε” master curves were fitted to HN function for one and/or two relaxation peaks with and without the electrical conductivity contribution in order to investigate the relaxation time (τ), dielectric strengths (Δε), modulus formalism (M”) and the electrical conductivitie (σ). The translational and reorientational degrees of freedom of PEO/K2PtCl6 complex composites are responsible for the relaxation behavior which is predicted to be correlated to the relaxation behavior of the polymer electrolyte below and above the glass transition temperature (Tg). The relaxation time (τ) deduced from β‐relaxation follows Arrhenius‐like behavior while that deduced from α‐relaxation process follows Vogel–Tamman–Fulcher (VTF) behavior.