Na3V(PO4)(2) : A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries

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Title
Na3V(PO4)(2) : A New Layered-Type Cathode Material with High Water Stability and Power Capability for Na-Ion Batteries
Author(s)
Jongsoon Kim; Gabin Yoon; Hyungsub Kim; Young-Uk Park; Kisuk Kang
Publication Date
2018-06
Journal
CHEMISTRY OF MATERIALS, v.30, no.11, pp.3683 - 3689
Publisher
AMER CHEMICAL SOC
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. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5274
ISSN
0897-4756
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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