Pyrrolidinium cation-based ionic liquids with different functional groups: Butyl, butyronitrile, pentenyl, and methyl butyrate

Byeongjin Baek, Sangjun Lee, Cheolsoo Jung

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Four pyrrolidium (PY)-based ILs were synthesized from TFSI- ions and PY + ions functionalized by butyl, butyronitrile, pentenyl, and methyl butyrate as an electrolyte for Li ion batteries. The ILs with a lower T m had a much higher viscosity and lower conductivity because of the biased electron distribution in their quaternary ammonium cations. The potential windows of the ILs demonstrated stability above 5.0 V and all of the synthesized ILs showed evidence of forming a SEI layer on the graphite electrode. The peak currents for reduction on the graphite electrode and for oxidation on the LiCoO 2 electrode were 100 times stronger in PY(butyl)TFSI and PY(pentenyl)TFSI than in PY(butyronitrile)TFSI and PY(methyl butyrate)TFSI. This difference resulted from the electrolyte conductivity which is deeply related to the solvation strength between Li + ions and the functional groups of the ILs.

Original languageEnglish
Pages (from-to)6220-6234
Number of pages15
JournalInternational Journal of Electrochemical Science
Volume6
Issue number12
StatePublished - Dec 2011

Keywords

  • Functional group
  • Ionic liquid
  • Li ion batteries
  • Pyrrolidinium

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