Abstract
Carbon-coated olivine-structured LiFePO4/C composites are synthesized via an efficient and low-cost carbothermal reduction method using Fe2O3 as iron source at a relative low temperature (600 °C). The effects of two kinds of carbon sources, inorganic (acetylene black) and organic (sucrose), on the structures, morphologies, and lithium storage properties of LiFePO4/C are evaluated in details. The particle size and distribution of the carbon-coated LiFePO4 from sucrose (LiFePO4/SUC) are more uniform than that obtained from acetylene black (LiFePO4/AB). Moreover, the LiFePO4/SUC nanocomposite shows superior electrochemical properties such as high discharge capacity of 156 mAh g−1 at 0.1 C, excellent cyclic stability, and rate capability (78 mAh g−1 at 20 C), as compared to LiFePO4/AB. Cyclic voltammetric test discloses that the Li-ion diffusion, the reversibility of lithium extraction/insertion, and electrical conductivity are significantly improved in LiFePO4/SUC composite. It is believed that olivine-structured LiFePO4 decorated with carbon from organic carbon source (sucrose) using Fe2O3 is a promising cathode for high-power lithium-ion batteries.
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Acknowledgements
This work was supported by the NSFC (21501071), China Postdoctoral Science Foundation funded project (2014M561577, 2014M561572), the Technology Innovation Fund of Science and Technology Enterprises in Jiangsu Province (BC2014206), the Science and Technology Support Project in Jiangsu Province (BE2014008, BE2014008-2).
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Wang, Y., Li, H., Chen, M. et al. Synthesis and electrochemical performance of LiFePO4/C cathode materials from Fe2O3 for high-power lithium-ion batteries. Ionics 23, 377–384 (2017). https://doi.org/10.1007/s11581-016-1910-z
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DOI: https://doi.org/10.1007/s11581-016-1910-z