Binary Li4Ti5O12-Li2Ti3O7 Nanocomposite as an Anode Material for Li-Ion Batteries

Authors

  • Guan-Nan Zhu,

    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
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  • Long Chen,

    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
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  • Yong-Gang Wang,

    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
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  • Con-Xiao Wang,

    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
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  • Ren-Chao Che,

    1. Department of Materials Science and Advanced Materials Laboratory, Fudan University, Shanghai 200438, China
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  • Yong-Yao Xia

    Corresponding author
    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China
    • Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China.
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Abstract

Li4Ti5O12 typically shows a flat charge/discharge curve, which usually leads to difficulty in the voltage-based state of charge (SOC) estimation. In this study, a facile quench-assisted solid-state method is used to prepare a highly crystalline binary Li4Ti5O12-Li2Ti3O7 nanocomposite. While Li4Ti5O12 exhibits a sudden voltage rise/drop near the end of its charge/discharge curve, this binary nanocomposite has a tunable sloped voltage profile. The nanocomposite exhibits a unique lamellar morphology consisting of interconnected nanograins of ≈20 nm size with a hierarchical nanoporous structure, contributing to an enhanced rate capability with a capacity of 128 mA h g−1 at a high C-rate of 10 C, and excellent cycling stability.

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