Impact of EC-plasticizer on electrical and dielectrical properties of PEO/PVdF/NaNO₃ solid polymer electrolyte systems

Ethylene carbonate (EC) based plasticized solid polymer electrolyte (PSPE) systems have been prepared with PEO (polyethylene oxide) and PVdF (polyvinylidene fluoride) as copolymers, sodium nitrate as a salt by using solution casting technique. In this investigation the wt% of PEO, PVdF, NaNO3 maintain constant and EC wt% varies. The addition of small concentration of EC to PSPE systems facilitates fast ion conduction through it. As a result, the effective number of charge carriers mobility within the polymer matrix. The maximum conductivity has been observed for PPNE-5 system at ambient temperature. The characteristic studies (XRD, FTIR, SEM and DSC) have been carried out for all the systems. The electrical, dielectrical and complex impedance spectroscopic properties have been studied by using an impedance analyzer. Wagner's polarization method has been used for the investigation of ion transference number.