In the present work, polymer electrolyte (PE) film consisting of poly(vinyl alcohol) (PVA) with magnesium bromide
(MgBr2) as electrolytic salt, tetraethylene glycol dimethyl ether (TEGDME) as plasticizer and Li2O at
different concentration (0.02, 0.04, 0.06 wt.%) as the filler has been prepared by solution casting technique.
The polymeric film was flexible and self-standing with proper mechanical strength and studied for application
in a solid-state rechargeable magnesium battery. The interactions between the filler and PVA chains are
studied by X-ray and thermogravometric analyses. The conductivity increased with addition of filler reached
to ∼10−5 S · cm−1 at 0.04 wt.% Li2O. The frequency dependence of ac conductivity obeys Jonscher power
law. The estimated value of Mg+2 ion transference number is found to be 0.7 for high conducting film. A solid
state battery based on the optimum polymer electrolyte with a configuration MgPEV2O5 has exhibited an
open circuit voltage of 1.5 V. Also this battery has exhibited a discharge capacity ≈6.11 mA h. The discharge
characteristics are found to be satisfactory as a laboratory cell.