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Probing microstructure and phase evolution of α-MoO<sub>3</sub> nanobelts for sodium-ion batteries by <i>in situ</i> transmission electron microscopy [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 447-456 : digital, PDF file
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The fundamental electrochemical reaction mechanisms and the phase transformation pathways of layer-structured α-MoO3 nanobelt during the sodiation/desodiation process to date remain largely unknown. In this study, to observe the real-time sodiation/desodiaton behaviors of α-MoO3 during electrochemical cycling, we construct a MoO3 anode sodium-ion battery inside a transmission electron microscope (TEM). Utilizing in situ TEM and electron diffraction pattern (EDP) observation, α-MoO3 nanobelts are found to undergo a unique multi-step phase transformation. Upon the first sodiation, α-MoO3 nanobelts initially form amorphous NaxMoO3 phase and are subsequently sodiated into intermediate phase of crystalline NaMoO2, finally resulting in the crystallized Mo nanograins embedded within the Na2O matrix. During the first desodiation process, Mo nanograins are firstly re-oxidized into intermediate phase NaMoO2 that is further transformed into amorphous Na2MoO3, resulting in an irreversible phase transformation. Upon subsequent sodiation/desodiation cycles, however, a stable and reversible phase transformation between crystalline Mo and amorphous Na2MoO3 phases has been revealed. In conclusion, our work provides an in-deepth understanding of the phase transformation pathways of α-MoO3 nanobelts upon electrochemical sodiation/desodiation processes, with the hope of assistance in designing sodium-ion batteries with enhanced performance.
Report Numbers
E 1.99:bnl--112456-2016-ja
bnl--112456-2016-ja
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Note
Published through SciTech Connect.
07/15/2016.
"bnl--112456-2016-ja"
"KC0403020"
Nano Energy 27 C ISSN 2211-2855 AM
Weiwei Xia; Feng Xu; Chongyang Zhu; Huolin L. Xin; Qingyu Xu; Pingping Sun; Litao Sun.
Funding Information
SC0012704
View MARC record | catkey: 24065033