A simple approach to synthesize nanosized sulfur/graphene oxide materials for high-performance lithium/sulfur batteries

作者：Zhang Yongguang; Zhao Yan; Bakenov Zhumabay^*

来源：Ionics, 2014, 20(7): 1047-1050.

DOI：10.1007/s11581-014-1165-5

• Graphene oxide
• Lithium/sulfur battery
• Nanostructured sulfur cathode
• Porous structure

We report on a simple and facile synthesis route for the sulfur/graphene oxide composite via ultrasonic mixing of the nano-sulfur and graphene oxide aqueous suspensions followed by a low-temperature heat treatment. High-resolution transmission and scanning electronic microscopy observations revealed the formation of a highly porous structure consisting of sulfur with uniform graphene oxide coating on its surface. The resulting sulfur/graphene oxide (S/GO) composite exhibited high and stable specific discharge capacities of 591 mAh g(-1) after 100 cycles at 0.1 C and good rate capability. This enhanced electrochemical performance could be attributed to the effective confining the polysulfides dissolution and accommodation of the volume changes during the Li-S electrochemical reaction by the functional groups on the graphene oxide coating layer. Furthermore, the highly developed porous structure of S/GO composite favors the enhanced ion transport and electrolyte diffusion.

• 出版日期2014-7