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Effects of Carbon Precursors on LiFePO4/C Nanocomposites for Lithium-Ion Batteries

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Here we report the synthesis of LiFePO4/C nanocomposite cathode materials for lithium ion batteries using a novel solution-based technique. Our technique is a modified version of traditional sol–gel technique and utilizes chelating agents which simultaneously create a coating of carbon on the LiFePO4 nanoparticles. Two different chelating agents namely, poly vinyl alcohol (PVA) and citric acid were investigated. Different amounts of chelating agent were used in the starting solution to give different ratios of LiFePO4 to Carbon in the final product. Materials thus synthesized were thoroughly characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectrometer (FTIR), Raman spectroscopy, and electrochemical measurements. We find that chelating agents with short carbon chains (such as citric acid) performs better than agents with long carbon chains (such as PVA), and the carbon/lithium atomic ratios in the starting solution are optimized to be between 4:2 and 6:2.
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Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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