Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 660, Issue 1, Pages 108-113Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.06.013
Keywords
Lithium iron phosphate; Polyaniline; Self-assembly; Electrochemical performance; Lithium-ion batteries
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Funding
- Natural Science Foundation of Distinguished Young Scientists [50825203]
- 863 program [2009AA03Z225, 2011AA11290]
- Natural Science Foundation of Hubei Province [2008CDA026]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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Carbon-coated LiFePO4 (C-LFP) composites incorporated with electrochemically-active conducting polymer polyaniline (PANI) are fabricated via a self-assembly process. Inorganic acids HCl, H2SO4 and H3PO4 are used as dopants for PANI. The C-LFP/PANI composites are characterized by thermogravimetric analysis, scanning electron microscopy, electrochemical impedance spectroscopy, Raman spectra and four-probe resistivity measurements. Our results show that a remarkable improvement in capacity and rate capability can be achieved in the C-LFP/PANI composite cathodes doped with HCl and H3PO4. The C-LFP/PANI-HCl composite exhibits the best electrochemical performance, which gives a ca. 15% capacity enhancement at 0.2 C and 40% enhancement at 5 C compared to the parent C-LFP. The mechanism for the enhancement has been discussed. (C) 2011 Elsevier B.V. All rights reserved.
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