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Optimized electrochemical performance of LiMn0.9Fe0.1−x Mg x PO4/C for lithium ion batteries

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Title: Optimized electrochemical performance of LiMn0.9Fe0.1−x Mg x PO4/C for lithium ion batteries
Authors: Yi, Huihua1, Hu, Chenglin1, Fang, Haisheng hsfang1981@yahoo.com.cn, Yang, Bin1, Yao, Yaochun1, Ma, Wenhui1, Dai, Yongnian1
Source: Electrochimica Acta. Apr2011, Vol. 56 Issue 11, p4052-4057. 6p.
Subjects: Electrochemistry, Lithium-ion batteries, Solid state chemistry, Temperature effect, X-ray diffraction, Cations, Magnesium
Abstract: Abstract: A series of LiMn0.9Fe0.1−x Mg x PO4/C (x =0, 0.01, 0.02, 0.05) was synthesized by a solid state reaction, and the effect of synthesis temperature and Fe/Mg ratio on the electrochemical performance of the obtained materials was investigated by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and electrochemical measurements. The electrochemical performance of the Fe and Mg co-substituted LiMnPO4 was obviously improved with increasing synthesis temperature from 650 to 800°C, but further increase led to an abrupt capacity loss due to the impurity formation. The Fe and Mg co-substitution could remarkably enhance the electrochemical activity of LiMnPO4 compared with the Fe substitution only, but too high level of Mg doping would worsen the rate capability. The LiMn0.9Fe0.09Mg0.01PO4/C synthesized at 800°C demonstrated the optimum electrochemical performance with a high capacity and an excellent rate capability. Even discharged at the rate of 10C, a capacity of 60mAhg−1 was still observed. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: A series of LiMn0.9Fe0.1−x Mg x PO4/C (x =0, 0.01, 0.02, 0.05) was synthesized by a solid state reaction, and the effect of synthesis temperature and Fe/Mg ratio on the electrochemical performance of the obtained materials was investigated by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and electrochemical measurements. The electrochemical performance of the Fe and Mg co-substituted LiMnPO4 was obviously improved with increasing synthesis temperature from 650 to 800°C, but further increase led to an abrupt capacity loss due to the impurity formation. The Fe and Mg co-substitution could remarkably enhance the electrochemical activity of LiMnPO4 compared with the Fe substitution only, but too high level of Mg doping would worsen the rate capability. The LiMn0.9Fe0.09Mg0.01PO4/C synthesized at 800°C demonstrated the optimum electrochemical performance with a high capacity and an excellent rate capability. Even discharged at the rate of 10C, a capacity of 60mAhg−1 was still observed. [Copyright &y& Elsevier]
ISSN:00134686
DOI:10.1016/j.electacta.2011.01.121