Polyterthiophene/CNT composite as a cathode material for lithium batteries employing an ionic liquid electrolyte

S. R. Sivakkumar, Patrick C. Howlett, Bjorn Winther Jensen, Maria Forsyth, Douglas R. MacFarlane

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A polyterthiophene (PTTh)/multi-walled carbon nanotube (CNT) composite was synthesised by in situ chemical polymerisation and used as an active cathode material in lithium cells assembled with an ionic liquid (IL) or conventional liquid electrolyte, LiBF4/EC-DMC-DEC. The IL electrolyte consisted of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) containing LiBF4 and a small amount of vinylene carbonate (VC). The lithium cells were characterised by cyclic voltammetry (CV) and galvanostatic charge/discharge cycling. The specific capacity of the cells with IL and conventional liquid electrolytes after the 1st cycle was 50 and 47 mAh g-1 (based on PTTh weight), respectively at the C/5 rate. The capacity retention after the 100th cycle was 78% and 53%, respectively. The lithium cell assembled with a PTTh/CNT composite cathode and a non-flammable IL electrolyte exhibited a mean discharge voltage of 3.8 V vs Li+/Li and is a promising candidate for high-voltage power sources with enhanced safety.

Original languageEnglish
Pages (from-to)6844-6849
Number of pages6
JournalElectrochimica Acta
Volume54
Issue number27
DOIs
Publication statusPublished - 2009 Nov 30
Externally publishedYes

Keywords

  • Conducting polymer cathode
  • Ionic liquid electrolyte
  • Lithium battery
  • Polyterthiophene
  • Polythiophene

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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  • Cite this

    Sivakkumar, S. R., Howlett, P. C., Winther Jensen, B., Forsyth, M., & MacFarlane, D. R. (2009). Polyterthiophene/CNT composite as a cathode material for lithium batteries employing an ionic liquid electrolyte. Electrochimica Acta, 54(27), 6844-6849. https://doi.org/10.1016/j.electacta.2009.06.091