JMS_V4_N2_RP1 Rajiv Kumar Shuchi Sharma Naresh Dhiman Dinesh Pathak Journal on Material Science 2347–615X 4 2 1 8 Impedance Spectroscopy, Diethyl Carbonate, Ion Aggregates, Conductivity, pH, Viscosity In this paper, proton and lithium conducting polymer gel electrolytes containing ortho-nitrobenzoic acid, lithium hexafluorophosphate, diethyl carbonate, polymethylmethacrylate have been prepared and characterized by impedance spectroscopy. The ionic conductivity, pH and viscosity of the electrolytes have been studied as a function of acid/salt and polymer concentration. In both proton and lithium conducting polymer gel electrolytes, the ionic conductivity has been found to increase with an increase in acid/salt and polymer concentration. In proton conducting polymer gel electrolytes, an increase in conductivity has been explained to be due to the dissociation of undissociated + acid or ion aggregates present in the electrolytes, which increases the free H ion concentration and this has been monitored by pH measurements. Similar results have also been observed for lithium ion conducting polymer gel electrolytes. An increase in conductivity with polymer addition has been explained by “Breathing Polymeric Chain Model”, which shows that the polymer plays an active role in enhancing the conductivity along with an increase in mechanical strength, which is advantageous for their use in various applications. July – September 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=8124