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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Doubling the capacity of lithium manganese oxide spinel by a flexible skinny graphitic layer

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Title
Doubling the capacity of lithium manganese oxide spinel by a flexible skinny graphitic layer
Author
Noh, Hyun KukPark, Han-SaemJeong, Hu YoungLee, Sang UckSong, Hyun-Kon
Issue Date
2014-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.53, no.20, pp.5059 - 5063
Abstract
By coating nanoparticular lithium manganese oxide (LMO) spinel with a few layers of graphitic basal planes, the capacity of the material reached up to 220 mAhg-1 at a cutoff voltage of 2.5 V. The graphitic layers 1) provided a facile electron-transfer highway without hindering ion access and, more interestingly, 2) stabilized the structural distortion at the 3 V region reaction. The gain was won by a simple method in which microsized LMO was ball-milled in the presence of graphite with high energy. Vibratory ball milling pulverized the LMO into the nanoscale, exfoliated graphite of less than 10 layers and combined them together with an extremely intimate contact. Ab initio calculations show that the intrinsically very low electrical conductivity of the tetragonal phase of the LMO is responsible for the poor electrochemical performance in the 3 V region and could be overcome by the graphitic skin strategy proposed.
URI
https://scholarworks.unist.ac.kr/handle/201301/4322
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84900002553
DOI
10.1002/anie.201400490
ISSN
1433-7851
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ECHE_Journal Papers
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