Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7740429 | Journal of Power Sources | 2013 | 20 Pages |
Abstract
A method for synthesizing nano-sulfur/polypyrrole/graphene nanosheet (nano-S/PPy/GNS) ternary composite with a dual-layered structure is described. By taking advantage of both capillary force driven self-assembly of polypyrrole on graphene nanosheets and adhesion ability of polypyrrole to sulfur, we develop a stable and ordered nano-S/PPy/GNS composite cathode for lithium/sulfur (Li/S) batteries. The high dispersion of nanoscopic sulfur on the surface of PPy/GNS composite and good electrical conductivity of GNS seems to benefit the sulfur utilization and the reactivity of the composite. Furthermore, PPy plays an important role in retarding diffusion of polysulfides out of the electrode. The resulting nano-S/PPy/GNS composite cathode delivers a high initial capacity of 1415.7 mAh gâ1, remaining a reversible capacity of 641.5 mAh gâ1 after 40 cycles at 0.1 C rate.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yongguang Zhang, Yan Zhao, Aishuak Konarov, Denise Gosselink, Hayden Greentree Soboleski, P. Chen,