Synthesis of graphene oxide/sulfur composites for advanced lithium-sulfur batteries

The graphene oxide is successfully synthesized via modified hummers method, and the graphene oxide/sulfur composites are synthesized via melt diffusion method. The GO/S composites are used in lithium-sulfur battery to enhance its electrochemical performance. Higher initial capacity and better rate performance can be achieved, which can be attributed to the interlayer structure of the graphene oxide and the functional groups on the graphene oxide. The GO/S composites with high sulfur loading of 65.3 wt% exhibit high initial capacity of 1128 mAh g(-1) at 0.1 C. After 100 cycles, the GO/S composites still remain a discharge capacity of 603 mAh g(-1); the coulombic efficiency is nearly 100%.

Automated summary

Graphene oxide was synthesized successfully using a modified hummers method and graphene oxide/sulfur composites were then prepared via melt diffusion method to enhance the performance of lithium-sulfur batteries. The composites exhibited higher initial capacity and improved rate performance, attributed to the unique interlayer structure of graphene oxide and its functional groups.