Polyacrylonitrile–sulfolane–CuX2 (X=Cl, Br, CF3SO3) solid polymer electrolyte

A series of polyacrylonitrile–sulfolane–CuX2 (PAN–TMS–CuX2, where X=Cl, Br, CF3SO3) polymer electrolytes, of thickness between 0.03 and 0.07 cm, were prepared by means of the solution cast technique. The solvent content was as high as 60–70 wt.%. Conductivities of the foils obtained from impedance measurements were of the order of 10−3 Ω−1 cm−1. Temperature variation of the conductivity for all the systems studied was of the Arrhenius type. Exchange current density at the Cu∣electrolyte interface, determined from the Tafel plot, was of the order of milliampere (mA). Cyclic voltammetry showed the irreversible character of the copper plating–stripping process.