Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1047-1050 |
| Number of pages | 4 |
| Journal | Ionics |
| Volume | 20 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 2014 |
Keywords
- Graphene oxide
- Lithium/sulfur battery
- Nanostructured sulfur cathode
- Porous structure
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)