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Issue 4, 2017
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Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries

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Abstract

Flexible and freestanding MoO2/Mo2C imbedded carbon fibers (MoO2/Mo2C ICFs) have been successfully synthesized via an integrated procedure including electrospinning, thermo-plastication in air and reduction/carbonization at high temperature. A series of techniques such as SEM, TEM, N2 adsorption–desorption analysis, XRD, TGA, IR and XPS have been employed to systemically characterize the MoO2/Mo2C ICFs. In particular, it is observed that the MoO2/Mo2C ICFs derived from phosphomolybdic acid have more highly porous structures than those derived from molybdic acid. Most impressively, the obtained MoO2/Mo2C ICFs are directly used as binder- and current collector-free anode materials for LIBs, which exhibit desirable rate capability and satisfactory cycling performance. The electrochemical investigations illustrated that the MoO2/Mo2C ICFs could deliver an initial discharging capacity of 1422.0 mA h g−1 with an original coulombic efficiency of 63.3%, and the subsequent reversible capacity could reach as high as 1103.6 mA h g−1 even after 70 cycles at a current density of 0.1 A g−1. Such a capacity is larger than the theoretical capacity of MoO2 (838 mA h g−1) and pure carbon fibers (460.5 mA h g−1). More importantly, the MoO2/Mo2C ICFs exhibited an excellent rate performance with a capacity of 445.4 mA h g−1 even at a charging current density of 1.6 A g−1. The remarkable enhancement in rate capability and long cycling performance resulted from a synergistic effect between the MoO2 nanoparticles and porous carbon fiber matrix. This methodology can be widely extended to fabricate other metal oxide/carbon composites for significant energy storage and conversion applications.

Graphical abstract: Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries

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Publication details

The article was received on 05 Nov 2016, accepted on 15 Dec 2016 and first published on 15 Dec 2016


Article type: Paper
DOI: 10.1039/C6CP07569J
Phys. Chem. Chem. Phys., 2017,19, 2908-2914

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    Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries

    H. Li, H. Ye, Z. Xu, C. Wang, J. Yin and H. Zhu, Phys. Chem. Chem. Phys., 2017, 19, 2908
    DOI: 10.1039/C6CP07569J

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