Long-cycle stability for Li-S batteries by carbon nanofibers/reduced graphene oxide as host cathode material
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3D network structure of carbon nanofibers (CNF) chemically cross-linked with reduced graphene oxide (RGO) sheet was successfully prepared by electrospinning a dispersion of polyacrylonitrile (PAN) and graphene oxide (GO) sheets in dimethylformamide followed by heat treatment. Cathodes made with such composites after infused with sulfur (CNF-RGO/S) were able to deliver an initial reversible capacity of 730 mAh/g and 378 mAh/g after 500 cycles at 0.1 C. Even at a high rate of 5 C, the CNF-RGO/S experienced the capacity of 227 mAh/g and no capacity fade after 400 cycles. In contrast, the capacity of an electrode without adding RGO decayed dramatically. The CNF matrix provides stable mechanical stability and shortens diffusion paths. The addition of RGO sheets increase the contact area with the electrolyte and speed up the reaction rate. These results demonstrate that the 3D network structure is of great potential as the cathode for long-cycle and high-rate rechargeable Li-S batteries.
KeywordsCarbon nanofiber Graphene Electrospinning Li-S batteries
This work was supported by Nature Science Foundation of China (NO: 11702234, 11602213), and the Nature Science Foundation of Hunan province (NO: 2018JJ3488, 2017JJ3301).
- 19.Zhou G (2017) Graphene–pure sulfur sandwich structure for ultrafast, long-life lithium-sulfur batteries[M]//design fabrication and electrochemical performance of nanostructured carbon based materials for high-energy lithium–sulfur batteries. Springer, Singapore, pp 75–94Google Scholar
- 29.Song J, Wang X, Chang CT (2014) Preparation and characterization of graphene oxide[J]. J Nanomater 2014:1–6Google Scholar
- 32.Shahriary L, Athawale AA (2014) Graphene oxide synthesized by using modified hummers approach[J]. Int J Renew Energy Environ Eng 2(01):58–63Google Scholar