High performance sulfur/nitrogen-doped graphene cathode for lithium/sulfur batteries

Yan Zhao, Zagipa Bakenova, Yongguang Zhang, Huifen Peng, Hongxian Xie, Zhumabay Bakenov

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

A sulfur/nitrogen-doped graphene (S/N-G) composite was synthesized by simple sonicated mixing of nanosized sulfur suspension and nitrogen-doped graphene suspension followed by heat treatment. Scanning electron microscopy and energy dispersive spectroscopy mapping showed the formation of a porous structure with uniform distribution of sulfur and nitrogen-doped graphene. Electrochemical performance reveals that the resultant S/N-G composite exhibits a high reversible capacity of 1355 mAh g−1 at the initial cycle, with 823 mAh g−1 remaining after 80 cycles at 0.1 C. Moreover, a reversible capacity of 475 mAh g−1 could still be obtained at 2.5 C. Such an electrochemical performance of S/N-G composite is superior to the graphene counterpart. The enhanced electrochemical performance can be attributed to the introduction of nitrogen-doped graphene with the N functionalization, which provides both a more effective electron conduction path and a stronger physical and chemical confinement setting for elemental sulfur and resident polysulfides.

Original languageEnglish
Pages (from-to)1925-1930
Number of pages6
JournalIonics
Volume21
Issue number7
DOIs
Publication statusPublished - Jul 25 2015

Keywords

  • Cathode material
  • Lithium/sulfur battery
  • Simple sonicated mixing
  • Sulfur/nitrogen-doped graphene (S/N-G) composite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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