Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 159, Issue 10, Pages A1624-A1629Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.042210jes
Keywords
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Funding
- Natural Science Foundation of China [50825203, 21175050]
- 863 program [2011AA11290, 2011DFB70020]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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Conducting polymer polypyrrole (PPy) was revisited as cathode material for lithium-ion battery. Synthesis condition, microstructure, doping effect and electrochemical performance were systematically investigated. Chemical polymerization was employed to synthesize PPy with sodium p-toluenesulfonate (pTSNa) as anionic dopant. Fe-2(SO4)(3) center dot xH(2)O, ammonium persulfate (APS) and FeCl3 center dot 6H(2)O were used as oxidants respectively. The product was carefully characterized by elemental analysis, conductivity measurement, scanning electron microscopy, Fourier transform infrared spectroscopy and electrochemical impedance spectroscopy. Experiments show that the oxidant and the molar ratio of pTSNa to monomer pyrrole (Py) strongly influence the yield, conductivity, composition, structure, morphology and electrochemical performance. As a cathode material, the PPy obtained with Fe-2(SO4)(3) center dot xH(2)O as oxidant at [pTSNa]/[Py] = 2.0 exhibits the best performance, which gives a discharge capacity up to 122.5 mAh g(-1) at current density of 7.2 mA g(-1) and a capacity retention of 89.9% after 600 cycles at 72 mA g(-1). (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.042210jes] All rights reserved.
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