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Crystallinity-Controlled Titanium Oxide–Carbon Nanocomposites with Enhanced Lithium Storage Performance

Authors

  • Yuanyuan Zhou,

    1. Green Chemical Technology Division, Korea Research Institute of Chemical Technology (KRICT)&, University of Science and Technology (UST), Daejeon 305-600 (Korea), Fax: (+82) 42-860-7389
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  • Dr. Jinwoo Lee,

    1. Department of Chemical Engineering, Pohang University of Science and Technology, Kyungbuk 790-784 (Korea)
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  • Dr. Chul Wee Lee,

    1. Green Chemical Technology Division, Korea Research Institute of Chemical Technology (KRICT)&, University of Science and Technology (UST), Daejeon 305-600 (Korea), Fax: (+82) 42-860-7389
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  • Mihye Wu,

    1. Green Chemical Technology Division, Korea Research Institute of Chemical Technology (KRICT)&, University of Science and Technology (UST), Daejeon 305-600 (Korea), Fax: (+82) 42-860-7389
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  • Dr. Songhun Yoon

    Corresponding author
    1. Green Chemical Technology Division, Korea Research Institute of Chemical Technology (KRICT)&, University of Science and Technology (UST), Daejeon 305-600 (Korea), Fax: (+82) 42-860-7389
    • Green Chemical Technology Division, Korea Research Institute of Chemical Technology (KRICT)&, University of Science and Technology (UST), Daejeon 305-600 (Korea), Fax: (+82) 42-860-7389
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Abstract

Nanocomposites of crystalline-controlled TiO2–carbon are prepared by a novel one-step approach and applied in anodes of lithium ion batteries. In our nanocomposite anodes, the Li+ capacity contribution from the TiO2 phase was enormous, above 400 mAh g−1 (Li1+xTiO2, x>0.2), and the volumetric capacity was as high as 877 mAh cm−3 with full voltage utilization to 0 V versus Li/Li+, which resulted in higher energy density than that of state-of-the-art titania anodes. For the first time, it was clearly revealed that the capacity at 1.2 and 2.0 V corresponded to Li+ storage at amorphous and crystalline TiO2, respectively. Furthermore, improvements in the rate capability and cycle performance were observed; this was attributed to resistance reduction induced by higher electrical/Li+ conduction and faster Li+ diffusion.

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