Fig. 2a shows the AC conductivity of the Starch/PVALiBr
nano composite polymer electrolytes at room temperature with different contents of silica nanoparticles. AC conductivity spectra have proved fruitful in exploring not only the electrical aspects but some structural rather micro structural aspects of disordered solid like nanocomposite polymer electrolytes. From the Fig. 2a it is discernable that the conductivity of the sample S-3 with the Starch/PVA polymer electrolytes with different contents of silica nano particles. The decrease in the real part of the impedance supports the increase in ac conductivity [29]. The overall study of the ac conductivity spectra reveals the considerable effect of the silica nanoparticles in the polymer electrolyte samples. Fig. 2b shows the frequency dependent conductivity of the highest conducting
sample S-3 with 3 wt% nano fumed silica for the temperature range 30–90 _C. The drastic increase in the conductivity at elevated temperatures is the outcome of the synergized contributions of the increased segmental motion and multiplication in the number of charge carriers. The high frequency plateau observed in the higher temperatures reflects the increase in dc conductivity.