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Ionothermal synthesis and enhanced electrochemical performance of nanostructure Cr-doped LiMn2O4 for lithium-ion batteries

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Abstract

LiCr x Mn2−x O4 (x = 0, 0.02, 0.05, 0.12) materials were effectively synthesized by imidazolium-based ionic liquid as reaction medium at ambient pressure. The morphologies of Cr-doped LiMn2O4 via calcination were characterized by scanning electron microscopy (SEM). SEM reveals that the LiCr0.12Mn1.88O4 sample has regular nanostructure and a uniform particle size of 50–100 nm. Among the four samples prepared in ionic liquid, the charge/discharge tests indicate that LiCr0.12Mn1.88O4 presents the best performance of rate capacity and cycle stability. A typical LiCr0.12Mn1.88O4 delivers the initial discharge capacity of 129.6 mAh g−1 and behaves a quite slow capacity fading with 96.8 % of initial capacity remained after 200 cycles at 0.5 C in the voltage range of 3.4–4.3 V. The improved electrochemical performance can be attributed to Cr doping and recyclable ionothermal method. Furthermore, this ionothermal synthesis is believed to provide a new reaction route for lithium-ion battery materials with mild reaction conditions.

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Acknowledgments

This work was supported by the Science and Technology Project of Anhui Province (1301022077) and the Science and Technology Project of Land and Resources of Anhui Province (2012-k-18).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Xueliang Li, Qiao Zhou, Hongliu Wang & Shuai Liu

  2. Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemistry and Chemical Engineering, Hefei, 230009, People’s Republic of China

    Xueliang Li, Qiao Zhou, Hongliu Wang & Shuai Liu

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  1. Xueliang Li
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  2. Qiao Zhou
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  3. Hongliu Wang
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  4. Shuai Liu
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Correspondence to Xueliang Li.

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Li, X., Zhou, Q., Wang, H. et al. Ionothermal synthesis and enhanced electrochemical performance of nanostructure Cr-doped LiMn2O4 for lithium-ion batteries. Ionics 21, 1517–1523 (2015). https://doi.org/10.1007/s11581-014-1352-4

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  • DOI: https://doi.org/10.1007/s11581-014-1352-4

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