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Electrochemical properties of single-phase LiFePO4 synthesized using LiF as Li precursor and hydrogen and carbon gel as reducing agents

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Abstract

LiFePO4 samples have been synthesized by mixing stoichiometric amounts of (NH4)2HPO4, FeC2O4·2H2O, and LiF. During synthesis, carbon gel was used as the carbon source. Single-phase LiFePO4 can be formed when the heating temperature ranges from 650 to 800 °C and it is decomposed into Li4P2O7, Li3PO4, Fe2P, and Li3P7 when the temperature comes to 850 °C. We find that the ratio of the lattice parameter (a/c) decreases with the increasing temperature, thereby increasing the Li+ diffusion channel length. Both the decrease of a/c and the abrupt crystal growth are expected to contribute to the monotonic decrease of the initial capacity of the samples. The sample heated at 650 °C with a smaller uniform particle size and relative higher specific surface area (8.2 m2/g) shows an excellent electrochemical performance. The initial specific capacity of 156.7(3) mAh/g is obtained at the rate of C/10.

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Acknowledgements

This work was supported by NSFC Grant (No. 50772039) and by the Science and Technology Bureau of Guangdong government (No. 07118058). The authors are indebted to Prof. G. L. Lv of Zhejiang University of China and Prof. C. Dong of Institute of Physics, Chinese Academy of Science for their assistance with the XRD experiments. We also thank Prof. Y. J. Zhao and Prof. X. Chen of South China University of Technology for the correction on the language.

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Authors and Affiliations

  1. School of Physics, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Y. Z. Dong, Y. M. Zhao, L. Chen, Z. F. He & Y. H. Chen

  2. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, People’s Republic of China

    H. Duan

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  1. Y. Z. Dong
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  2. Y. M. Zhao
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  3. H. Duan
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  4. L. Chen
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Correspondence to Y. M. Zhao.

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Dong, Y.Z., Zhao, Y.M., Duan, H. et al. Electrochemical properties of single-phase LiFePO4 synthesized using LiF as Li precursor and hydrogen and carbon gel as reducing agents. J Solid State Electrochem 14, 131–137 (2010). https://doi.org/10.1007/s10008-009-0798-1

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