A novel lithium/sulfur battery based on sulfur/graphene nanosheet composite cathode and gel polymer electrolyte

Yongguang Zhang, Yan Zhao, Zhumabay Bakenov

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A novel sulfur/graphene nanosheet (S/GNS) composite was prepared via a simple ball milling of sulfur with commercial multi-layer graphene nanosheet, followed by a heat treatment. High-resolution transmission and scanning electronic microscopy observations showed the formation of irregularly interlaced nanosheet-like structure consisting of graphene with uniform sulfur coating on its surface. The electrochemical properties of the resulting composite cathode were investigated in a lithium cell with a gel polymer electrolyte (GPE) prepared by trapping 1 mol dm−3 solution of lithium bistrifluoromethanesulfonamide in tetraethylene glycol dimethyl ether in a polymer matrix composed of poly(vinylidene fluoride-co-hexafluoropropylene)/poly(methylmethacrylate)/silicon dioxide (PVDF-HFP/PMMA/SiO2). The GPE battery delivered reversible discharge capacities of 809 and 413 mAh g−1 at the 1st and 50th cycles at 0.2C, respectively, along with a high coulombic efficiency over 50 cycles. This performance enhancement of the cell was attributed to the suppression of the polysulfide shuttle effect by a collective effect of S/GNS composite cathode and GPE, providing a higher sulfur utilization.

Original languageEnglish
Article number137
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 1 2014
Externally publishedYes

Keywords

  • Gel polymer electrolyte
  • Graphene nanosheet
  • Lithium/sulfur battery
  • Nanostructured sulfur cathode
  • Poly(vinylidene fluoride-co-hexafluoropropylene)/poly(methylmethacrylate)/silicon dioxide polymer matrix

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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