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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries

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Title
Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries
Author
Mun, JunyoungYim, TaeeunPark, Jang HoonRyu, Ji HeonLee, Sang-YoungKim, Young GyuOh, Seung M.
Issue Date
2014-08
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.4, pp.5802
Abstract
Room-temperature ionic liquid (RTIL) electrolytes have attracted much attention for use in advanced, safe lithium-ion batteries (LIB) owing to their nonvolatility, high conductivity, and great thermal stability. However, LIBs containing RTIL-electrolytes exhibit poor cyclability because electrochemical side reactions cause problematic surface failures of the cathode. Here, we demonstrate that a thin, homogeneous surface film, which is electrochemically generated on LiCoO2 from an RTIL-electrolyte containing an unsaturated substituent on the cation (1-allyl-1-methylpiperidinium bis(trifluoromethanesulfonyl)imide, AMPip-TFSI), can avert undesired side reactions. The derived surface film comprised of a high amount of organic species from the RTIL cations homogenously covered LiCoO2 with a ,25 nm layer and helped suppress unfavorable thermal reactions as well as electrochemical side reactions. The superior performance of the cell containing the AMPip-TFSI electrolyte was further elucidated by surface, electrochemical, and thermal analyses.
URI
https://scholarworks.unist.ac.kr/handle/201301/6411
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84906814331
DOI
10.1038/srep05802
ISSN
2045-2322
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ECHE_Journal Papers
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