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Improved Li-Storage Performance of Li4Ti5O12 Coated with C[BOND]N Compounds Derived from Pyrolysis of Urea through a Low-Temperature Approach

Authors

  • Huilin Pan,

    1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
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  • Liang Zhao,

    1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
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  • Prof. Yong-Sheng Hu,

    Corresponding author
    1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
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  • Prof. Hong Li,

    1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
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  • Prof. Liquan Chen

    1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (P.R. China)
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Abstract

A uniform and thin amorphous layer of a C[BOND]N compound was coated on porous Li4Ti5O12 by pyrolysis of urea on its surface at a rather low temperature of 400 °C in an Ar atmosphere. Such a C[BOND]N coating layer greatly improved the electrochemical performance of Li4Ti5O12. After coating, Li4Ti5O12 showed good rate and excellent cycling performance. Reversible capacities for the coated sample of 134 and 105 mAh g−1 were obtained at current rates of 5C and 10C, respectively, in the voltage range of 1–2.2 V, which is approximately two and five times higher than those of pristine Li4Ti5O12 at the same current rates. Excellent capacity retention of 95.8 % was achieved for the coated sample after 2000 cycles in a half cell at a 2C rate.

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