Sulfur-encapsulated carbon templet as a structured cathode material for secondary sodium-sulfur battery

Sodium sulfur (Na-S) battery is an electrochemical energy stowage stratagem which has been labelled as a practicable aspirant for extensive grid-ion verve stowage structures. Na-S battery consumes a high energy concentration as well as a high thermodynamic efficiency of charge and discharge rotations. In this aspect, sulfur is a promising cathode material due to its capability of intercalating two electrons simultaneously in addition to its low cost and natural abundance. Due to the insulating nature of sulfur, a carbon matrix is introduced and encapsulates the sulfur. In this work, coconut carbon, rGO, and MWCNT acted as a various carbon matrix synthesized by the melt diffusion method. Further, physical and electrochemical studies have been investigated. Interestingly, S/rGO exhibits an initial discharge capacity of 965 mAhg-1 at 0.1C with a coulombic efficiency of 81%.