Open Conference Systems, International Conference on Electrochemical Energy and Technology

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HYDROTHERMAL SYNTHESIS OF SPHERICAL Fe2.80(PO4)1.98O0.26(OH)1.82 PRECURSOR OF LiFePO4/C CATHODE MATERIAL FOR LITHIUM BATTERIES
Qing-Yu Li

Last modified: 2014-10-08

Abstract


LiFePO4/C was synthesized by a simple one-step solid state route using Fe2.80(PO4)1.98O0.26(OH)1.82 microspheres as raw materials. The spherical precursors were synthesized via a hydrothermal process. With the assist of surfactant, The pyrolysis of the selected surfactant at high temperature reduces higher valence to Fe2+ and coats carbon on the synthesized LiFePO4 particles in situ. Both the LiFePO4/C and the Fe2.80(PO4)1.98O0.26(OH)1.82 precursors were characterized by XRD, TG, SEM, TEM, and Raman spectroscopy. The as-synthesized LiFePO4/C composite shows excellent high-rate capability with discharge capacities reaching 165.3 and 128.2 mAhg-1 at 0.1 and 5 C current rates, respectively. Furthermore, the LiFePO4/C material composed of microspheres has a high tap density (1.5 gcm-3). The as-prepared LiFePO4/C material can be the cathode material of lithium ion batteries for large-scale applications.

References


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