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000837288 1001_ $$0P:(DE-HGF)0$$aCharles, Daniel Scott$$b0
000837288 245__ $$aStructural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage
000837288 260__ $$aLondon$$bNature Publishing Group$$c2017
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000837288 520__ $$aAqueous 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.
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000837288 7001_ $$0P:(DE-Juel1)169262$$aFeygenson, Mikhail$$b1
000837288 7001_ $$00000-0002-9071-3383$$aPage, Katharine$$b2
000837288 7001_ $$00000-0002-0563-1544$$aNeuefeind, Joerg$$b3
000837288 7001_ $$0P:(DE-HGF)0$$aXu, Wenqian$$b4
000837288 7001_ $$0P:(DE-HGF)0$$aTeng, Xiaowei$$b5$$eCorresponding author
000837288 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms15520$$gVol. 8, p. 15520 -$$p15520 -$$tNature Communications$$v8$$x2041-1723$$y2017
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