Structural and Ionic conductivity studies of aluminium doped PVP-MgBr 2 Nano composite films

Abstract

Abstract In this present study, nano composite polymer films are prepared based on PVA and Magnesium Bromide (MgBr2) with doping of additive plasticizers (Al2O3) with different ratios using Solution cast technique. XRD pattern confirms the semi crystalline nature of the polymer films. The ionic conductivity of the prepared films is measured by using AC impedance spectroscopy and it is found to be at 10− 2 S/cm. The electrical conductivity studies are carried out by DC ionic conductivity set up and for the composition 85 (PVP):15(MgBr2):0.1(Al2O3), the high ionic conductivity is found to be at \(1.25\times {10}^{-2} \text{S}/\text{c}\text{m}\) at room temperature. The conductivity is found to rise with an increase in temperature. The temperature dependent conductivity of the polymer electrolyte follows the Arrhenius relationship which shows hopping of ion mechanism in the polymer matrix. The transference numbers are calculated using Wagner DC Polarization technique and the majority of charge carrier’s are found to be ions rather than electrons. The charge distribution is studied at electrode–electrolyte interface by dielectric properties. Finally a solid state battery has been fabricated with the combination of Mg/(PVP + MgBr2:Al2O3)/(I2 + C + electrolyte) and discharge characteristics of the cell measured is up to 180 Hrs.