Study of Dielectric Properties and Ion Transport Parameters in Chitosan-Barium Nitrate Based Solid Polymer Electrolytes

摘要

In this report, dielectric properties and ion transport parameters in chitosan (CS) based solid polymerelectrolyte (SPE) were examined. In this study, various amount of barium nitrate Ba(NO 3 ) 2 wasdissolved in CS host polymer to synthesize solid polymer electrolytes (SPEs). The dielectric constantand dielectric loss increased with increasing Ba(NO 3 ) 2 . On the basis of Trukhan model, the ion transportparameters, such as mobility (μ), diffusion coefficient (D), and charge carrier number density (n) werecalculated successfully. Due to higher concentration of salt, enlargement of dielectric loss along with arise in dielectric constant was perceived. Electrode polarization allowed an extensive dispersion ofdielectric constant spectra that transpired at low frequency region. The interesting observation is the losstangent peaks shifted to higher frequency region and the intensity decreased with an increase intemperature. The increase of μ and D are related to shifting of tanδ to high frequency sides withincreasing temperature. The decrease of n is correlated with decrease of tanδ peak with temperature. Themechanism of ion transport was investigated in the polymer via the tanδ spectra. The ion transportparameters are found to be 9×10 -8 cm 2 /s, 0.8×10 17 /cm 3 , and 3×10 -6 cm 2 /Vs for D, n, and μ, respectivelyat ambient temperature. All these parameters have shown increasing as temperature increased. Theelectric modulus parameters were studied in an attempt to understand the relaxation dynamics and toclarify the relaxation process and ion dynamics relationship.