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TiNb2O7 anode for high energy and power Li-ion hybrid electrochemical capacitor

Researchers in Singapore report the first use 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. 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 3 000  cycles with about 84 % of the initial value. A paper on their work is published in the journal ChemSusChem.

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.

—Aravindan et al.

Resources

  • Aravindan, V., Sundaramurthy, J., Jain, A., Kumar, P. S., Ling, W. C., Ramakrishna, S., Srinivasan, M. P. and Madhavi, S. (2014) “Unveiling TiNb2O7 as an Insertion Anode for Lithium Ion Capacitors with High Energy and Power Density,” ChemSusChem doi: 10.1002/cssc.201400157

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