Ion dynamics behavior in solid polymer electrolyte

A conducting polymer system, having room temperature conductivity ~ 1.26 × 10− 4 S/cm (for 50% NaI concentration) and ionic transference number ~ 0.80, has been prepared by mixing NaI in a novel polymer host (synthesized polymer + poly (ethylene oxide)). Mobility (μ) and total number of charge carriers (N), estimated from dielectric parameters, have a value of ~ 1.65 × 10− 2 cm2 V− 1 s− 1 and 4.70 × 1016 cm− 3 respectively. Inverse relationship between conductivity power law exponent n and N/N0 (fractional number of dissociated charge carriers) is explained in terms of statistical nature of ion dynamics. The temperature dependence of “n” studied separately in universal power law (UPL) and super linear power law (SLPL) region revealed that exponent n responds differently to temperature in these two different regions. Ion hopping frequency (ωp), obtained from universal power law (UPL) region, is used for scaling of conductivity and permittivity curves. Conductivity scaling followed a master curve Y = 1 + Xn, having n = 0.85 ± 0.07, covering both UPL as well as SLPL region which confirms that both phenomena have the same origin.