| Summary: | The current solid electrolytes suffer from low ionic conductivity and interfacial instability. To improve the performance of the electrolyte, the addition of additives to the solid electrolyte is being extensively investigated. A sodium ion conducting solid electrolyte system was prepared via solid state reaction technique. Sodium Iodide (NaI) and Sodium Phosphate (Na3PO4) were mixed in varied compositions and the optimum composition obtained with the highest conductivity at room temperature was used to study the effect of polymer additive by using Poly(L– Leucine)–1,3–diamino propane (PLL). The effect of PLL on the electrical conductivity of the binary compound was investigated by Electrical Impedance Spectroscopy (EIS) technique. Results from EIS have proven this compound to be superionic with maximum conductivity in the range of 10−3 S cm−1. Fourier Transform Infrared Spectroscopy (FTIR) analysis revealed the band of C=O at 1650 cm−1 experienced shifting indicates some interaction has occurred. © 2016 Trans Tech Publications, Switzerland.
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