A Polymer electrolyte film with sodium ion conduction comprising of polyvinyl chloride (PVC), polycarbonate (PC) and NaClO4 as salt were prepared by solvent casting technique.
The addition of polymer PC to PVC significantly decreases the water absorbing property of PVC based electrolytes. The structural and variation in film morphology investigation of the polymer electrolyte was carried out with XRD, FTIR and SEM. Optical absorption studies were carried out in the 200-600 nm wavelength range and absorption edge and band gap were estimated for pure and NaClO4 doped films. The impedance spectroscopy studies in the temperature range 303- 363 K shows that the conductivity increases with increasing dopant concentration. The polymer electrolyte displayed Arrhenius behaviour of conductivity with temperature. Complex impedance plots (Cole–Cole plots) were drawn to find frequency dependent conductivity (ac). Conductivity data shows that Activation energy decreases with increasing ionic conductivity. The transference number was measured to study suitability of this polymer film for battery applications. Transference number data shows that the charge transport in this polymer electrolyte is predominantly due to the ions (tion= 0.98). Using the electrolyte, cells with a configuration Na/(PVC+PC + NaClO4)/(I2+ C + electrolyte) were fabricated and their discharge profiles studied.
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