Poly(vinylidene fluoride-co-hexafluoropropylene)/poly(methylmethacrylate)/ nanoclay composite gel polymer electrolyte for lithium/sulfur batteries

Yongguang Zhang, Yan Zhao, Zhumabay Bakenov, Denise Gosselink, P. Chen

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

A gel polymer electrolyte (GPE) was developed by trapping 1 M solution of lithium hexafluorophosphate (LiPF6) in organic carbonate mixture in a polymer matrix composed of poly(vinylidene fluoride-co-hexafluoropropylene)/ poly(methylmethacrylate)/montmorillonite nanoclay (PVDF-HFP/PMMA/MMT). The physical and electrochemical properties of the resulting gel polymer electrolyte were investigated. AC impedance spectroscopy revealed that the ionic conductivity of gel polymer electrolyte containing 5 wt% MMT attains a maximum value of 3.06∈×∈10-3 S cm-1 at room temperature. Li/S cells assembled with the GPE-delivered reversible discharge capacities of 1,418 and 1,071 mAh g-1 in the first and 100th cycles at 0.1 C, respectively, along with high coulombic efficiency (about 100 %) over 100 cycles. The excellent cycle performance was attributed to the suppression of shuttle effect by the gel polymer electrolyte leading to the higher sulfur utilization in the cell. Even at a high C rate (1 C), the system still delivered 492 mAh g-1 specific discharge capacity, demonstrating the good ionic conductivity of the GPE.

Original languageEnglish
Pages (from-to)1111-1116
Number of pages6
JournalJournal of Solid State Electrochemistry
Volume18
Issue number4
DOIs
Publication statusPublished - Apr 2014

Keywords

  • Gel polymer electrolyte
  • Lithium/sulfur polymer battery
  • Nanostructured sulfur cathode
  • Poly(vinylidene fluoride-co-hexafluoropropylene)/ poly(methylmethacrylate)/montmorillonite nanoclay (PVDF-HFP/PMMA/MMT) polymer matrix

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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