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Cho, Jaephil
Nano Energy Storage Material Lab.
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Hierarchical surface atomic structure of a manganese-based spinel cathode for lithium-ion batteries

Author(s)
Lee, SanghanYoon, GabinJeong, MinseulLee, Min-JoonKang, KisukCho, Jaephil
Issued Date
2015-01
DOI
10.1002/anie.201408853
URI
https://scholarworks.unist.ac.kr/handle/201301/10263
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/anie.201408853/abstract
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.54, no.4, pp.1153 - 1158
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 800 cycles at 60°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.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1433-7851
Keyword (Author)
CathodesEpitaxial coatingHierarchical atomic structuresLithium manganese oxideLithium-ion batteries
Keyword
LIMN2O4 SPINELTEMPERATURE PERFORMANCECAPACITY LOSSESLISTABILITYALELECTROCHEMISTRY1ST-PRINCIPLESDISSOLUTIONELECTRODES

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