Electrochemical Performance of Lithium Sulfur Batteries with Plasticized Polymer Electrolytes based on P(VdF-co-HFP)

Abstract

The plasticized polymer electrolytes based on polyvinylidene fluoride-co-hexafluoropropylene (P(VdF-co-HFP)), tetra (ethylene glycol) di-Me ether (TEGDME), and lithium perchlorate (LiClO4) are prepd. for the lithium sulfur batteries by soln. casting with a doctor-blade. The polymer electrolyte with EO: Li ratio of 16:1 shows the max. ionic cond., 6.5 × 10-4 S/cm at room temp. To understand the effect of the salt concn. on the electrochem. performance, the polymer electrolytes are characterized using electrochem. impedance spectroscopy (EIS), IR spectroscopy, viscometer, and differential scanning calorimeter (DSC). The optimum concn. and mobility of the charge carriers could lead to enhance the utilization of sulfur active materials and the cyclability of the Li/S unit cell. [on SciFinder(R)]