Synthesis of LiFePO₄/C composite as a cathode material for lithium-ion battery by a novel two-step method
Date
2012
Authors
Zhang, L.
Xiang, H.
Zhu, X.
Yang, W.
Wang, H.
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Journal article
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Journal of Materials Science, 2012; 47(7):3076-3081
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Le Zhang, Hongfa Xiang, Xuefeng Zhu, Weishen Yang, Haihui Wang
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Abstract
In this study, LiFePO4/C is synthesized via a novel two-step method. The first step is the synthesis of nano-sized intermediate FePO4 by a modified sol–gel method. A fast and full combustion procedure is involved to remove carbon and control the size of the intermediate particles. The second step is to prepare LiFePO4/C by combining solid-state reaction with controllable carbon coating. This two-step method is facile to prepare nano-sized LiFePO4 and easy to optimize the carbon content for surface coating. X-ray diffraction shows that the LiFePO4/C composite possesses good crystallinity. Spherical morphology with a diameter of 30–150 nm is observed by scanning electron microscope and transmission electron microscope. Electrochemical measurements indicate that the LiFePO4/C composite exhibits discharge capacities of 162, 144, 126, and 106 mAh g−1 at 0.1, 1, 2, and 5C, respectively. No capacity fading is observed in 50 cycles.
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© Springer Science+Business Media, LLC 2011