Synthesis and Electrochemical Performance of PEG-MnO₂–Sulfur Composites Cathode Materials for Lithium–Sulfur Batteries

Lithium–Sulfur (Li–S) batteries have been achieved great attention in recent years owing to its high theoretical capacity (1675 mAh/g) and energy density (2600 Wh/kg). PEG embedded MnO₂/Sulfur composite was prepared via solid state reaction method. The composite was characterized by Transmission electron microscopy, scanning electron microscopy and X-ray diffractometer. MnO₂ effectively suppress the diffusion of polysulfides and add a mechanical strength to the electrode. PEG binds the MnO₂ and S, resulting in the minimization of active material loss and improves the electrochemical performance in lithium sulfur batteries. The PEG/MnO₂/Sulfur composite exhibits discharge capacity of 647 mAh/g even after 30 cycles with appreciable sustainability. Therefore, the resulting PEG/MnO₂/Sulfur composite exhibited as a desirable cathode material for Li–S battery.