%0 Journal Article
%A Charles, Daniel Scott
%A Feygenson, Mikhail
%A Page, Katharine
%A Neuefeind, Joerg
%A Xu, Wenqian
%A Teng, Xiaowei
%T Structural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage
%J Nature Communications
%V 8
%@ 2041-1723
%C London
%I Nature Publishing Group
%M FZJ-2017-06257
%P 15520 -
%D 2017
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000401849900001
%R 10.1038/ncomms15520
%U https://juser.fz-juelich.de/record/837288