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