Effect of Iron Oxide on Ionic Conductivity of Polyindole Based Composite Polymer Electrolytes

Composite polymer electrolytes (CPE) have recently received a great attention due to their potential application in solid state batteries. A novel polyindole based Fe2O3 dispersed CPE containing lithium perchlorate has been prepared by sol-gel method. The crystallinity, morphology and ionic conductivity of composite polymer electrolyte were examined by XRD, scanning electron microscopy, and impedance spectroscopy, respectively. The XRD data reveals that the intensity of the Fe203 has decreased when the concentration of the polymer is increased in the composite. This composite polymer electrolyte showed a linear relationship between the ionic conductivity and the reciprocal of the temperature, indicative of the system decoupled from the segmental motion of the polymer. Thus Polyindole-Iron oxide composite polymer electrolyte is a potential candidate for lithium ion electrolyte batteries. The complex impedance data for this has been analyzed in different formalisms such as permittivity (epsilon) and electric modulus (M). The value of epsilon' for CPE decreases with frequency, which is a normal dielectric behavior in polymer nanocomposite.