Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15520
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Funding
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0010286]
- DOE Office of Science [DE-AC02-06CH11357]
- National Science Foundation [147791]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory [DE-AC05-00OR22725]
- U.S. Department of Energy (DOE) [DE-SC0010286] Funding Source: U.S. Department of Energy (DOE)
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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.
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