TY - JOUR
T1 - A novel nano-sulfur/polypyrrole/graphene nanocomposite cathode with a dual-layered structure for lithium rechargeable batteries
AU - Zhang, Yongguang
AU - Zhao, Yan
AU - Konarov, Aishuak
AU - Gosselink, Denise
AU - Soboleski, Hayden Greentree
AU - Chen, P.
N1 - Funding Information:
This research was financially supported by Positec, the Natural Sciences and Engineering Research Council of Canada (NSERC) , Canadian Foundation for Innovation (CFI) and the Canada Research Chairs (CRC) program. The TEM research described in this paper was performed at the Canadian Centre for Electron Microcsopy at McMaster University, which is supported by NSERC and other government agencies. One of the authors (YZ) thanks the China Scholarship Council for Study Abroad Scholarship.
PY - 2013/6/10
Y1 - 2013/6/10
N2 - 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.
AB - 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.
KW - Conducting sulfur composite
KW - Lithium-sulfur battery
KW - Sulfur cathode
KW - Sulfur/polypyrrole/graphene nanosheets composite
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U2 - 10.1016/j.jpowsour.2013.05.005
DO - 10.1016/j.jpowsour.2013.05.005
M3 - Article
AN - SCOPUS:84878597670
SN - 0378-7753
VL - 241
SP - 517
EP - 521
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
