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Unveiling TiNb2O7 as an Insertion Anode for Lithium Ion Capacitors with High Energy and Power Density

Authors

  • Dr. Vanchiappan Aravindan,

    Corresponding author
    1. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)
    • Vanchiappan Aravindan, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

      Seeram Ramakrishna, Centre for Nanofibers and Nanotechnology, Department of Mechanical Engineering, National University of Singapore, Singapore 117576 (Singapore)===

      Srinivasan Madhavi, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

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    • These authors contributed equally to this work.

  • Dr. Jayaraman Sundaramurthy,

    1. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)
    2. Environmental and Water Technology, Center of Innovation, Ngee Ann Polytechnic, Singapore 599489 (Singapore)
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    • These authors contributed equally to this work.

  • Akshay Jain,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576 (Singapore)
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  • Dr. Palaniswamy Suresh Kumar,

    1. Environmental and Water Technology, Center of Innovation, Ngee Ann Polytechnic, Singapore 599489 (Singapore)
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  • Dr. Wong Chui Ling,

    1. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)
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  • Prof. Seeram Ramakrishna,

    Corresponding author
    1. Centre for Nanofibers and Nanotechnology, Department of Mechanical Engineering, National University of Singapore, Singapore 117576 (Singapore)
    • Vanchiappan Aravindan, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

      Seeram Ramakrishna, Centre for Nanofibers and Nanotechnology, Department of Mechanical Engineering, National University of Singapore, Singapore 117576 (Singapore)===

      Srinivasan Madhavi, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

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  • Prof. Madapusi P. Srinivasan,

    1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576 (Singapore)
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  • Prof. Srinivasan Madhavi

    Corresponding author
    1. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)
    2. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
    • Vanchiappan Aravindan, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

      Seeram Ramakrishna, Centre for Nanofibers and Nanotechnology, Department of Mechanical Engineering, National University of Singapore, Singapore 117576 (Singapore)===

      Srinivasan Madhavi, Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Singapore 637553 (Singapore)===

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Abstract

This is the first report of the utilization of TiNb2O7 as an insertion-type anode in a lithium-ion hybrid electrochemical capacitor (Li-HEC) along with an activated carbon (AC) counter electrode derived from a coconut shell. A simple and scalable electrospinning technique is adopted to prepare one-dimensional TiNb2O7 nanofibers that can be characterized by XRD with Rietveld refinement, SEM, and TEM. The lithium insertion properties of such electrospun TiNb2O7 are evaluated in the half-cell configuration (Li/TiNb2O7) and it is found that the reversible intercalation of lithium (≈3.45 mol) is feasible with good capacity retention characteristics. The Li-HEC is constructed with an optimized mass loading based on the electrochemical performance of both the TiNb2O7 anode and AC counter electrode in nonaqueous media. The Li-HEC delivers very high energy and power densities of approximately 43 Wh kg−1 and 3 kW kg−1, respectively. Furthermore, the AC/TiNb2O7 Li-HEC delivers a good cyclability of 3000 cycles with about 84 % of the initial value.

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