• 文献标题:   A novel nano-sulfur/polypyrrole/graphene nanocomposite cathode with a dual-layered structure for lithium rechargeable batteries
  • 文献类型:   Article
  • 作  者:   ZHANG YG, ZHAO Y, KONAROV A, GOSSELINK D, SOBOLESKI HG, CHEN P
  • 作者关键词:   lithiumsulfur battery, sulfur cathode, sulfur/polypyrrole/graphene nanosheets composite, conducting sulfur composite
  • 出版物名称:   JOURNAL OF POWER SOURCES
  • ISSN:   0378-7753 EI 1873-2755
  • 通讯作者地址:   Univ Waterloo
  • 被引频次:   80
  • DOI:   10.1016/j.jpowsour.2013.05.005
  • 出版年:   2013

▎ 摘  要

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.