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Direct Observation of an Anomalous Spinel-to-Layered Phase Transition Mediated by Crystal Water Intercalation

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Authors
Kim, Sangryun; Nam, Kwan Woo; Lee, Soyeon; Cho, Woosuk; Kim, Joo-Seong; Kim, Byung Gun; Oshima, Yoshifumi; Kim, Ju-Sik; Doo, Seok-Gwang; Chang, Hyuk; Aurbach, Doron; Choi, Jang Wook
Issue Date
2015-12
Citation
Angewandte Chemie - International Edition, Vol.54 No.50, pp.15094-15099
Keywords
Birnessitecrystal waterlayered cathode materialsphase transitionsspinels
Abstract
The phase transition of layered manganese oxides to spinel phases is a well-known phenomenon in rechargeable batteries and is the main origin of the capacity fading in these materials. This spontaneous phase transition is associated with the intrinsic properties of manganese, such as its size, preferred crystal positions, and reaction characteristics, and it is therefore very difficult to avoid. The introduction of crystal water by an electrochemical process enables the inverse phase transition from spinel to a layered Birnessite structure. Scanning transmission electron microscopy can be used to directly visualize the rearrangement of lattice atoms, the simultaneous insertion of crystal water, the formation of a transient structure at the phase boundary, and layer-by-layer progression of the phase transition from the edge. This research indicates that crystal water intercalation can reverse phase transformation with thermodynamically favored directionality.
ISSN
1433-7851
URI
http://hdl.handle.net/10371/164658
DOI
https://doi.org/10.1002/anie.201505487
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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