Abstract
Core–shell LiFePO4/C composite was synthesized via a sol–gel method and doped by fluorine to improve its electrochemical performance. Structural characterization shows that F− ions were successfully introduced into the LiFePO4 matrix. Transmission electron microscopy verifies that F-doped LiFePO4/C composite was composed of nanosized particles with a ~3 nm thick carbon shell coating on the surface. As a cathode material for lithium-ion batteries, the F-doped LiFePO4/C nanocomposite delivers a discharge capacity of 162 mAh/g at 0.1 C rate. Moreover, the material also shows good high-rate capability, with discharge capacities reaching 113 and 78 mAh/g at 10 and 40 C current rates, respectively. When cycled at 20 C, the cell retains 86% of its initial discharge capacity after 400 cycles, demonstrating excellent high-rate cycling performance.
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Acknowledgment
This work was supported by a grant from Natural Science Foundation of Anhui province (Grant no. 090410178).
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Pan, F., Wang, Wl. Synthesis and characterization of core–shell F-doped LiFePO4/C composite for lithium-ion batteries. J Solid State Electrochem 16, 1423–1427 (2012). https://doi.org/10.1007/s10008-011-1544-z
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DOI: https://doi.org/10.1007/s10008-011-1544-z