Electrical conductivity studies on composite polymer electrolyte based on ionic liquid

Abstract

PEO: IL(1-ethyl-3-methylimidazolium Tosylate) and (PEO: IL) + xAl 2O3 polymer composite films have been obtained by (a) hot press and (b) solution cast techniques. The films prepared by hot press techniques give higher conductivity than their corresponding solution-casted samples. The PEO: IL polymer films conductivity has been found to increase with the amount of IL in PEO polymer matrix at a given temperature. The temperature dependence conductivity of PEO: IL films have been studied and discussed for the films prepared by two preparatory methods (a) hot press and (b) solution cast. The temperature dependence of conductivity exhibited an Arrhenius-type thermally activated behaviour. The ceramic filler Al2O3 concentration-dependent conductivity of PEO + IL (20 wt.%) film shows two conductivity maxima at 2 and 10 wt.%, respectively, which has been explained on the basis of double percolation threshold model. © 2010 Taylor & Francis.