Ionic Conduction of Blend Poly (Vinylidene Fluoride-Hexafluoro Propylene) and Poly (Methyl Methacrylate)-Grafted Natural Rubber Based Solid Polymer Electrolyte

摘要

The complex of Poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP), Poly (methylmethacrylate)-grafted natural rubber (MG49) (70/30) with lithium trifluoromethane sulfonate(LiCF3SO3) based solid polymer electrolyte has been prepared using solution casting technique. Theelectrochemical impedance spectroscopy (EIS) has been used to measure the ionic conductivity. Thiswork has demonstrated that the addition of an optimum content of LiCF3SO3 enhance the ionicconductivity of polymer electrolyte films and conductivity values were found to depend upon the4 -1 concentration of LiCF3SO3. The highest ionic conductivity achieved at 1.9710藟 S cm for 25 wt. %of LiCF3SO3 at room temperature. By applying the temperature range from 303 K to 373 K the-3 -1conductivity rise and the maximum conductivity obtained at 5.6510 S cm at 373 K. The interactionbetween Li ion and F atom in the structure of PVDF-HFP and O atom in MG49 resulting the formationof complex proved by the study of fourier transform infrared spectroscopy (FTIR). The amorphicityand crystallinity of electrolyte films have been characterized by x-ray diffraction (XRD) whichindicates decrease in the degree of crystallinity by increasing of salt concentration. Scanning electronmicroscopy (SEM) appeals that there is no phase separation in the blend. Furthermore the nature oflithium salt has been found to influence the morphology of the polymer-blended electrolytes byimprovement of surface morphology from rough to smooth with increasing salt content.