Dual Nature Embedded Electrode Investigated through Deis Technique for Lithium Ion Sulfur Battery

Abstract

The development of new energy storage technology has become an essential part to sustain the growth and progress of the society. In this respect, lithium ion batteries are one of the promising candidates to alleviate the growing energy crises and are attractive from the stability point of view but it is lacking the high power density and energy density. Lithium sulfur battery has high theoretical energy density of 2600 Wh/kg, and the abundance of sulfur open the scope of the battery to meet the market requirements. We report the lithium ion sulfur characteristics of the battery by using a versatile technique called dynamic electrochemical impedance spectroscopy analysis (DEIS). The cell configuration based on partially exfoliated carbon nanotube, graphene, and sulfur composite used as cathode and lithium foil as anode in LiTFSI, DOL/DME electrolyte, shows dual electrochemical behavior. The morphological features of the electrode material are probed by transmission electron microscopy as well as scanning electron microscopy. Through analysis of DEIS, cyclic voltammetry and galvanostatic cycling reveal dual nature of Li-ion and Li-S batteries. The cell operated in Li-ion battery condition shows a stable capacity of about 900mAh/g.