Rechargeable magnesium cells will be an important storage medium when the sustainable economy of the future is looking towards an alternative to lithium ion batteries as the energy storage medium. Rechargeable magnesium cells with Mg metal anode and graphite fluoride cathode were assembled with graft copolymer (PVDF‐g‐PAN50) soaked in imidazolium based ionic liquid and basic electrochemical studies, cyclic voltammetry and impedance were carried out to analyze the performance of the copolymer. Cyclic voltammetric studies show good mobility of Mg ions in the copolymer and also reversibility of Mg ions in the cathode material. Impedance studies reveal reduced resistance of the cell which may be due to formation of thinner or better conducting solid electrolyte interface on the electrode. Charge‐discharge results of the test cells with grafted copolymer revealed negligible capacity loss.