Structural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage

Daniel Scott Charles, Mikhail Feygenson, Katharine Page, Joerg Neuefeind, Wenqian Xu and Xiaowei Teng ()
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Daniel Scott Charles: University of New Hampshire
Mikhail Feygenson: Oak Ridge National Laboratory
Katharine Page: Oak Ridge National Laboratory
Joerg Neuefeind: Oak Ridge National Laboratory
Wenqian Xu: Advanced Photon Source, Argonne National Laboratory
Xiaowei Teng: University of New Hampshire

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and instabilities even in layered electrodes. Here we report that water induces structural rearrangements of the vanadium-oxygen octahedra and enhances stability of the highly disordered potassium-intercalated vanadium oxide nanosheets. The vanadium oxide nanosheets engaged by structural water achieves high capacity (183 mAh g−1 in half-cells at a scan rate of 5 mV s−1, corresponding to 0.89 charge per vanadium) and excellent cyclability (62.5 mAh g−1 in full cells after 5,000 cycles at 10 C). The promotional effects of structural water on the disordered vanadium oxide nanosheets will contribute to the exploration of disordered structures from earth-abundant elements for electrochemical energy storage.

Date: 2017
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DOI: 10.1038/ncomms15520

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