Polyterthiophene/CNT composite as a cathode material for lithium batteries employing an ionic liquid electrolyte |
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Authors: | S.R. Sivakkumar Patrick C. Howlett Bjorn Winther-Jensen Maria Forsyth Douglas R. MacFarlane |
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Affiliation: | a School of Chemistry, Monash University, Clayton, Victoria 3800, Australia b Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia c ARC Centre for Electromaterials Science, Australia |
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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. |
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Keywords: | Conducting polymer cathode Polythiophene Polyterthiophene Ionic liquid electrolyte Lithium battery |
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