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Na3V(PO4)(2) : A new layered-type cathode material with high water stability and power capability for Na-ion batteries

Cited 18 time in Web of Science Cited 20 time in Scopus
Authors
Kim, Jongsoon; Yoon, Gabin; Kim, Hyungsub; Park, Young-Uk; Kang, Kisuk
Issue Date
2018-06
Citation
Chemistry of Materials, Vol.30 No.11, pp.3683-3689
Abstract
We introduce Na3V(PO4)(2) as a new cathode material for Na-ion batteries for the first time. The structure of Na3V(PO4)(2) was determined using X-ray diffraction and Rietveld refinement, and its high water stability was clearly demonstrated. The redox potential of Na3V(PO4)(2) (similar to 3.5 V vs Na/Na+) was shown to be sufficiently high to prevent the side reaction with water (Na extraction and water insertion), ensuring its water stability in ambient air. Na3V(PO4)(2) also exhibited outstanding power capability, with similar to 79% of the theoretical capacity being delivered at 15C. First-principles calculation combined with electrochemical experiments linked this high power capability to the low activation barrier (similar to 433 meV) for the well-interconnected two-dimensional Na diffusion pathway. Moreover, outstanding cyclability of Na3V(PO4)(2) (similar to 70% retention of the initial capacity after 200 cycles) was achieved at a reasonably fast current rate of 1C.
ISSN
0897-4756
URI
http://hdl.handle.net/10371/164975
DOI
https://doi.org/10.1021/acs.chemmater.8b00458
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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