Abstract
Solid polymer electrolytes are fast replacing the liquid ones because of their numerous advantages such as high energy density, long cycling life, fast charging, low leakage currents and easy fabrication in a variety of shapes. Although most of the reports are based on Li-ion batteries, focus is slowly shifting to develop electrolytes with Group II elements such as Magnesium and Calcium because of their easy availability and moderate ionic activity.In this work, we have complexed polymer polyvinyl alcohol with Magnesium Chloride (MgCl2·6H2O) at different weight percentages. DC conductivity studies were conducted using a two probe setup. It is seen that the activation energy of the system depends on ionic conductivity which in turn depend on the percolating interfacial effect, i.e. anions adsorb on the surface of fillers (and then break up the ion pair and lead to increased interfacial ionic conductivity.This increased conductivity is partly due to the doping and partly due to midgap energy levels developing due to formation of polarons and bipolarons in the composite gel polymer electrolyte .
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