Enhancement of the Li+ ion transfer reaction at the LiCoO2 interface by 1,3,5-trifluorobenzene

Byeongjin Baek, Cheolsoo Jung

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


This work presents a method of enhancing the kinetics of the interfacial reaction using 1,3,5-trifluorobenzene (TFB) which is used as an electron acceptor due to its locally biased polarity and as a source of rearranging the layer of the electrolyte around LiCoO2 electrode, not a SEI layer source. The full cells with TFB show a decrease in irreversible capacity loss during the first charge-to-discharge process, regardless of the SEI layer formation, and also show better discharge properties even at high rate conditions. The charge transfer resistance (Rct) of the LiCoO2 half cell with TFB shows the smaller resistance than that of the TFB free half cell, and the activation energy calculated from the Rct was 24.7 kJ/mol for the TFB free half cell and 19.3 kJ/mol for the half cell with TFB. In addition, the film resistance of the half cell with TFB shows higher value when the temperature is below 283 K. Since Rct is related to the transfer resistance of the solvated Li+ ions on the surface of the LiCoO2 electrode, it will help design the electrolyte to improve the transfer velocity of Li+ ions around the cathode electrode for high power Li ion battery.

Original languageEnglish
Pages (from-to)3307-3311
Number of pages5
JournalElectrochimica Acta
Issue number9
StatePublished - 30 Mar 2010


  • 1,3,5-Trifluorobenzene
  • Activation energy
  • Charge transfer resistance
  • Interfacial reaction
  • Li ion battery


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