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Hierarchical surface atomic structure of a manganese-based spinel cathode for lithium-ion batteries

Cited 45 time in Web of Science Cited 49 time in Scopus
Authors
Lee, Sanghan; Yoon, Gabin; Jeong, Minseul; Lee, Min-Joon; Kang, Kisuk; Cho, Jaephil
Issue Date
2015-01
Citation
Angewandte Chemie - International Edition, Vol.54 No.4, pp.1153-1158
Keywords
cathodesepitaxial coatinghierarchical atomic structureslithium-ion batterieslithium manganese oxide
Abstract
The increasing use of lithium-ion batteries (LIBs) in high-power applications requires improvement of their high-temperature electrochemical performance, including their cyclability and rate capability. Spinel lithium manganese oxide (LiMn2O4) is a promising cathode material because of its high stability and abundance. However, it exhibits poor cycling performance at high temperatures owing to Mn dissolution. Herein we show that when stoichiometric lithium manganese oxide is coated with highly doped spinels, the resulting epitaxial coating has a hierarchical atomic structure consisting of cubic-spinel, tetragonal-spinel, and layered structures, and no interfacial phase is formed. In a practical application of the coating to doped spinel, the material retained 90% of its capacity after 800cycles at 60 degrees C. Thus, the formation of an epitaxial coating with a hierarchical atomic structure could enhance the electrochemical performance of LIB cathode materials while preventing large losses in capacity.
ISSN
1433-7851
URI
http://hdl.handle.net/10371/165067
DOI
https://doi.org/10.1002/anie.201408853
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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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