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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
Lee, Sang-YoungMun, JunyoungYim, TaeeunPark, Jang HoonRyu, Ji HeonKim, Young GyuOh, Seung M.
Keywords
BEHAVIOR; SPINEL; CATHODES; PYRROLIDINIUM; SUBSTITUENTS; TEMPERATURE; CHALLENGES; CARBONATE; GRAPHITE; SOLVENT
Issue Date
201408
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.4, no., pp.1 - 6
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.
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DOI
http://dx.doi.org/10.1038/srep05802
ISSN
2045-2322
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ECHE_Journal Papers
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