Impact of polymer blending on ionic conduction mechanism and dielectric properties of sodium based PEO-PVdF solid polymer electrolyte systems

Solid polymer blend electrolyte systems have been prepared with Poly (ethylene oxide) (PEO), Poly (Vinylidene fluoride) (PVdF) and complexed with NaNO3 salt by using solution cast method. The complexation of salt with polymer blend has been verified by X-Ray diffractogram, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopic studies. AC and DC conductivity measurements on these polymer blends were carried out by changing the weight percentages of PEO and PVdF with a constant weight percentage of NaNO3. The electric modulus(M') and the dielectric properties for all the polymer blend systems have been investigated with impedance spectroscopy in the frequency range 100–30 MHz. The variation of ionic conductivity of the blend polymer electrolyte systems with temperature followed Arrhenius behaviour and the maximum ionic conductivity 9.334 × 10−5 S cm−1 was observed for PEO:PVdF:NaNO3 (80:20:5) at room temperature which is attributed to the formation of the amorphous phase.