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Submicron-Sized Clusters of LiFePO4-C Nanoparticles for Lithium-Ion Battery Cathodes

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Submicron-sized clusters of LiFePO4-C nanoparticles were synthesized using a rheological phase reaction method. X-ray diffraction (XRD), scanning electron microscope (SEM), and high resolution transmission electron microscope (HRTEM) observations show that the as-prepared LiFePO4-C composite has good crystallinity consisting of submicron-sized clusters of carbon-coated LiFePO4 nanoparticles with size of around 50 nm. Both the graphite and disordered carbon are observed in the LiFePO4-C from the Raman spectroscopy and a low intensity ratio of the D band to that of the G band (I D /I G = 0.687) is obtained, confirming the high electronic conductivity of this material. The second cycle discharge capacities are 169.6, 131.4, and 95.6 mAh · g–1 at 0.1, 1.0, and 5.0 C, respectively. Excellent cycling performance with a discharge capacity of 80.9 mAh · g–1 is still maintained even at a high current density of 10 °C. Our results suggest that this material is a promising cathode material for lithium ion batteries.
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Document Type: Research Article

Publication date: 01 November 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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