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 Mg2+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[(CF3SO2)2N]2(>10-4S cm-1at room temperature). The dc polarization of a Pt/Mg cell using the polymeric electrolyte proved that Mg2+is mobile in the present polymeric system. A prototype cell was constructed using the polymeric electrolyte with a Mg (or Li) anode and a V2O5cathode, where the intercalation-deintercalation of Mg2+occurred reversibly. © 2002 Elsevier Science B.V. All rights reserved.
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