Rechargeable magnesium batteries using a novel polymeric solid electrolyte

Solid-state magnesium (Mg) batteries have been constructed with a novel pol ymeric electrolyte that conducts Mg2+ ion at ambient temperature. The polym eric electrolyte consisting of oligo(ethylene oxide)-grafted polymethacryla te and a linear polyether dissolving an Mg salt showed as high ionic conduc tivity as 0.4 mS cm(-1) at 60 degreesC. A test cell made of a V2O5 cathode and an Mg metal anode (Mg/V2O5) with the Mg2+-conducting polymeric electrol yte showed the first discharge capacity of about 100 mAh g (V2O5)(-1). The discharge capacity and the rechargeability of the cell were improved when M g metal was substituted by Li metal. The discharge and recharge profile of the cell using an Mg-doped V2O5 anode (MgxV2O5/V2O5) proved that the presen t polymeric Mg2+-ion conductor will help to develop an all-solid rechargeab le Mg-ion battery. (C) 2001 The Electrochemical Society.