Electrochemical Characterization of Nano-Structured Graphene Oxide/CNT Electrodes Containing Sulfur for Lithium Rechargeable Cells

Graphene Oxide (GO)/CNT-sulfur (S) composites were prepared by a method, in which PDDA coated on the CNT could interact with negatively charged GO. It was found that the GO/CNT-S composites showed the enhanced charge transfer by conducting network of GO/CNT and the improved sulfide ion movement. It is related to the improved surface area, because positively charged CNT would be used as a modifier for graphene sheets exfoliation. Electrochemical performances of prepared composites were evaluated in lithium-ion cells by cyclic voltammetry and galvanostatic cycling. When applied as the cathode material in lithium sulfur cells, GO/CNT-S composites exhibited a high reversible capacity of 1152.9 mAh g⁻¹ in the first cycle and maintain a satisfactory cyclability. The results indicate that the GO/CNT-S composites based lithium sulfur cells have a potential to replace the current lithium-ion cells.