Ionic conductance behavior of polymeric electrolytes containing magnesium salts and their application to rechargeable batteries
Abstract Polymeric electrolytes consisting of oligo(ethylene oxide)-grafted polymethacrylate (PEO-PMA) matrix, linear polyether and magnesium salts have been prepared, and their electrochemical behavior as solid Mg 2+ ion conductors has been examined. Thermal analyses showed that the obtained polymeric electrolytes are homogeneous and amorphous over a wide temperature range. The conductivity depended much on the kind of the dissolved magnesium salt. The highest conductivity was obtained for the polymeric electrolyte containing Mg[(CF 3 SO 2 ) 2 N] 2 (>10 −4 S cm −1 at room temperature). The dc polarization of a Pt/Mg cell using the polymeric electrolyte proved that Mg 2+ is mobile in the present polymeric system. A prototype cell was constructed using the polymeric electrolyte with a Mg (or Li) anode and a V 2 O 5 cathode, where the intercalation–deintercalation of Mg 2+ occurred reversibly.