A novel nano-sulfur/polypyrrole/graphene nanocomposite cathode with a dual-layered structure for lithium rechargeable batteries

Yongguang Zhang, Yan Zhao, Aishuak Konarov, Denise Gosselink, Hayden Greentree Soboleski, P. Chen

Research output: Contribution to journalArticle

93 Citations (Scopus)

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 g-1, remaining a reversible capacity of 641.5 mAh g -1 after 40 cycles at 0.1 C rate.

Original languageEnglish
Pages (from-to)517-521
Number of pages5
JournalJournal of Power Sources
Volume241
DOIs
Publication statusPublished - Jun 10 2013

Keywords

  • Conducting sulfur composite
  • Lithium-sulfur battery
  • Sulfur cathode
  • Sulfur/polypyrrole/graphene nanosheets composite

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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