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Improved electrochemical performance of the spherical LiNi0.5Mn1.5O4 particles modified by nano-Y2O3 coating

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Abstract

The large-scale use of LiNi0.5Mn1.5O4 as the cathode material for lithium-ion battery has so far been hindered by some drawbacks, for example, the interfacial side reactions between the high-voltage charged LiNi0.5Mn1.5O4 and the liquid electrolyte. Herein, the spherical LiNi0.5Mn1.5O4 is synthesized via co-precipitation method, and then the as-prepared LiNi0.5Mn1.5O4 is modified by nano-Y2O3 coating through heterogeneous nucleation route in order to improve its electrochemical performance. The effects of nano-Y2O3 coating on structural and electrochemical performance of LiNi0.5Mn1.5O4 are systematically investigated by X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy, atomic absorption spectroscopy, and electrochemical measurements. The results demonstrate that the surface of LiNi0.5Mn1.5O4 particle is uniformly encapsulated by nano-Y2O3 coating. Meanwhile, although the nano-Y2O3 coating can still keep the spinel structure of LiNi0.5Mn1.5O4, it can apparently improve its electrochemical performance. The nano-Y2O3-coated LiNi0.5Mn1.5O4 sample can deliver an initial discharge capacity of 126.1 mAh g−1 with the capacity retention of 97.7 % after 300 cycles at current rate of 1 C at 25 °C. Particularly, the nano-Y2O3-coated LiNi0.5Mn1.5O4 sample exhibits excellent capacity retention of 91.6 % after 100 cycles even at elevated temperature and a rate of 2 C.

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Acknowledgments

This work was funded by the National Natural Science Foundation of China under project no. 51272221, Scientific and Technical Achievement Transformation Fund of Hunan Province under project no. 2012CK1006, Key Project of Strategic New Industry of Hunan Province under project no. 2013GK4018, and Science and Technology Plan Foundation of Hunan Province under project no. 2013FJ4062.

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Authors and Affiliations

  1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Key Laboratory of Electrochemical Energy Storage and Conversion of Hunan Province, School of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, China

    Weicheng Wen, Xiukang Yang, Xianyou Wang & Long Ge Hongbo Shu

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  1. Weicheng Wen
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  2. Xiukang Yang
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  3. Xianyou Wang
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  4. Long Ge Hongbo Shu
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Correspondence to Xianyou Wang or Long Ge Hongbo Shu.

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Wen, W., Yang, X., Wang, X. et al. Improved electrochemical performance of the spherical LiNi0.5Mn1.5O4 particles modified by nano-Y2O3 coating. J Solid State Electrochem 19, 1235–1246 (2015). https://doi.org/10.1007/s10008-015-2743-9

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