TitleStudy of Relaxation Dynamics and Ion Conduction Mechanism of Composite Polymer Electrolyte and Gel Polymer Electrolyte
Abstract Secondary Lithium-Polymer rechargeable batteries are evolving as one of the reliable energy conversion devices. So far, Lithium-Ion batteries are widely used because of their higher energy and power density with casing economy. Till date in most of the commercial lithium batteries, liquid carbonate based electrolytes are used which are having various demerits like leakage, electrode corrosion, limited temperature ranges of operation etc. For this reason, polymer electrolytes are widely studied to replace the conventional liquid electrolytes. Polymer electrolytes can also be used in other energy storage/conversion devices like super-capacitors, fuel cells etc. Though, a lot of positive prospects are observed in polymer electrolytes but its success in practical devices are limited due to their low ionic conductivity. Therefore, in this study, based on literature review, two approaches are considered to increase the ionic conductivity of polymer electrolytes. First technique is to prepare composite polymer electrolytes and second one is by making gel polymer electrolyte. In this study polymer composite electrolytes and gel polymer electrolytes have been prepared using solution casting technique and phase inversion technique respectively. Various characterization techniques such as XRD, FE-SEM, FTIR and Broadband Dielectric Spectroscopy have been adopted to characterize these materials. In both the cases room temperature dc conductivity of the order of Scm-1 have been achieved. Moreover, the ion conduction mechanism in polymer electrolytes in general are more speculative than confirmative. The ion conduction mechanism in polymer composite electrolytes and gel polymer electrolytes are also discussed using different phenomenological approach and theoretical model based analysis. Relaxation dynamics of polymer composite electrolytes are also analyzed in detail. These studies are supposed to develop methodology to further improve the dc conductivity of polymer electrolytes. A detail explanation on these above mentioned subject matter will be presented in the seminar.