Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries
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- Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries
- Lee, Sang-Young; Mun, Junyoung; Yim, Taeeun; Park, Jang Hoon; Ryu, Ji Heon; Kim, Young Gyu; Oh, Seung M.
- BEHAVIOR; SPINEL; CATHODES; PYRROLIDINIUM; SUBSTITUENTS; TEMPERATURE; CHALLENGES; CARBONATE; GRAPHITE; SOLVENT
- Issue Date
- NATURE PUBLISHING GROUP
- SCIENTIFIC REPORTS, v.4, no., pp.1 - 6
- 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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