Structural and Electrochemical Characterization of Pure LiFePO 4 and Nanocomposite C- LiFePO 4 Cathodes for Lithium Ion Rechargeable Batteries

Kumar, Arun; Thomas, R.; Karan, N. K.; Saavedra-Arias, J. J.; Singh, M. K.; Majumder, S. B.; Tomar, M. S.; Katiyar, R. S.

doi:10.1155/2009/176517

Title: Structural and Electrochemical Characterization of Pure ${LiFePO}_{4}$ and Nanocomposite C- ${LiFePO}_{4}$ Cathodes for Lithium Ion Rechargeable Batteries

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Journal of Nanotechnology

DOI:https://doi.org/10.1155/2009/176517· OSTI ID:1197868

Kumar, Arun ^[1]; Thomas, R. ^[1]; Karan, N. K. ^[1]; Saavedra-Arias, J. J. ^[1]; Singh, M. K. ^[2]; Majumder, S. B. ^[3]; Tomar, M. S. ^[4]; Katiyar, R. S. ^[1]

Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3343, USA
Centre of Material Sciences, University of Allahabad, Allahabad 211002, India
Materials Science Center, Indian Institute of Technology, Kharagpur 721302, India
Department of Physics, University of Puerto Rico, Mayaguez, PR 00680-9016, USA

Pure lithium iron phosphate ( ${LiFePO}_{4}$ ) and carbon-coated ${LiFePO}_{4}$ (C- ${LiFePO}_{4}$ ) cathode materials were synthesized for Li-ion batteries. Structural and electrochemical properties of these materials were compared. X-ray diffraction revealed orthorhombic olivine structure. Micro-Raman scattering analysis indicates amorphous carbon, and TEM micrographs show carbon coating on ${LiFePO}_{4}$ particles. Ex situ Raman spectrum of C- ${LiFePO}_{4}$ at various stages of charging and discharging showed reversibility upon electrochemical cycling. The cyclic voltammograms of ${LiFePO}_{4}$ and C- ${LiFePO}_{4}$ showed only a pair of peaks corresponding to the anodic and cathodic reactions. The first discharge capacities were 63, 43, and 13 mAh/g for C/5, C/3, and C/2, respectively for ${LiFePO}_{4}$ where as in case of C- ${LiFePO}_{4}$ that were 163, 144, 118, and 70 mAh/g for C/5, C/3, C/2, and 1C, respectively. The capacity retention of pure ${LiFePO}_{4}$ was 69% after 25 cycles where as that of C- ${LiFePO}_{4}$ was around 97% after 50 cycles. These results indicate that the capacity and the rate capability improved significantly upon carbon coating.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NNX08AB12A

OSTI ID:: 1197868

Journal Information:: Journal of Nanotechnology, Journal Name: Journal of Nanotechnology Vol. 2009; ISSN 1687-9503

Publisher:: Hindawi Publishing CorporationCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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