Dielectric properties of polyethylene oxide doped with NH4I salt

Abstract

Dielectric parameters were studied over a frequency range from 10 Hz to 335 kHz at room temperature as a function of frequency and salt concentration. Permittivity (ε′) and dielectric loss (ε′′) data were fitted in the frequency domain using Yan and Rhodes model in order to estimate the relaxation times for PEO electrolytes. Due to the excellent fitting obtained using this model, PEO/NH4I electrolytes can be presented in equivalent circuit as RC in parallel circuits connected in series Addition of NH4I salt to PEO host, however, will increase AC conductivity, permittivity and dielectric loss while shortening relaxation time and reduces the melting temperature of PEO electrolytes. This study shows that the relaxation process of these electrolytes is due to viscoelastic relaxation or non-Debye relaxation with two values of relaxation time. ©2009 The Society of Polymer Science, Japan.