TY  - JOUR
AU  - Charles, Daniel Scott
AU  - Feygenson, Mikhail
AU  - Page, Katharine
AU  - Neuefeind, Joerg
AU  - Xu, Wenqian
AU  - Teng, Xiaowei
TI  - Structural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage
JO  - Nature Communications
VL  - 8
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2017-06257
SP  - 15520 -
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000401849900001
DO  - DOI:10.1038/ncomms15520
UR  - https://juser.fz-juelich.de/record/837288
ER  -