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Aligned Titania Nanotubes as an Intercalation Anode Material for Hybrid Electrochemical Energy Storage

Authors

  • Da-Wei Wang,

    1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China)
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  • Hai-Tao Fang,

    1. School of Materials Science and Engineering, Harbin Institute of Technology 92 West Dazhi Street, Harbin 150001 (P.R. China)
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  • Feng Li,

    1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China)
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  • Zhi-Gang Chen,

    1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China)
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  • Qi-Sheng Zhong,

    1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China)
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  • Gao Qing Lu,

    1. Australian Research Council Centre for Functional Nanomaterials, AIBN and School of Engineering The University of Queensland, Brisbane, QLD 4072 (Australia)
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  • Hui-Ming Cheng

    Corresponding author
    1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China)
    • Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016 (PR China).
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  • We thank Mr. Tao Sun for experimental suggestions. The authors acknowledge financial support from the National Natural Science Foundation of China (No. 50632040). Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

A new hybrid electrochemical cell incorporating aligned titania nanotubes (ATNTs) as the anode and ordered mesoporous carbon (OMC) as the cathode is demonstrated. The concept is characterized by the optimization of ionic transport in the anode and ionic uptake in the cathode. The ionic transport in the anode can be enhanced by reducing the tube length and wall thickness of the ATNTs. The ionic transport and uptake at the cathode is significantly improved by the combination of ordered mesopores and high specific surface area in the OMC. Remarkably, these hybrid electrochemical energy storage cells are capable of delivering a high energy density of 25 W h kg−1 and a high power density of 3000 W kg−1 at a short current-draining time of 30 s, more than two times higher than in previously reported hybrid cells. Another advantage of these hybrid cells is that they are safe and stable for long periods of operation owing to the absence of dendrite lithium metal and a solid electrolyte interphase. In terms of the fundamental electrochemistry, the superior performance of the hybrid cells is attributed to shortened electrolyte penetration depth and lithium ion diffusion distance in the ATNT anode, facilitating an effective lithiation anode process, and to the fast anion uptake at the cathode.

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