期刊
JOURNAL OF POWER SOURCES
卷 241, 期 -, 页码 517-521出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.05.005
关键词
Lithium-sulfur battery; Sulfur cathode; Sulfur/polypyrrole/graphene nanosheets composite; Conducting sulfur composite
资金
- Positec
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Canada Research Chairs (CRC) program
- NSERC
- China Scholarship Council
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 g(-1), remaining a reversible capacity of 641.5 mAh g(-1) after 40 cycles at 0.1 C rate. (C) 2013 Elsevier B.V. All rights reserved.
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