Abstract
Solid polymer electrolytes (SPEs) of poly(ethyleneoxide) and magnesium triflate, which are plasticized with propylene carbonate (PC), ethylene carbonate (EC) and a mixture of PC and EC, are studied for their conductivity, ac impedance of the Mg ∣ SPE interface, cyclic voltammetry, infrared spectroscopy and differential scanning calorimetry. In the presence of plasticizers, the ionic conductivity ( σ ) increases from a value of 1×10 −8 S cm −1 to about 1×10 −5 S cm −1 at ambient temperature. The σ is found to follow a VTF relationship with temperature. The values of the activation energy, pre-exponential factor and equilibrium glass transition temperature are shown to depend on the concentration of plasticizer. Ac impedance studies indicate lower interfacial impedance of Mg/plasticized SPE than stainless steel/plasticized SPE. The impedance spectra are analyzed using a non-linear least square curve fitting technique and the interfacial resistance of Mg/plasticized SPE is evaluated. The cyclic voltammetric results suggest a quasireversible type of Mg/Mg 2+ couple in plasticized SPE.
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