Electrochemical stability of bis(trifluoromethanesulfonyl)imide-based ionic liquids at elevated temperature as a solvent for a titanium oxide bronze electrode

Junyoung Mun, Yoon Seok Jung, Taeeun Yim, Hyun Yeong Lee, Hyo Jin Kim, Young Gyu Kim, Seung M. Oh

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Four different electrolytes are prepared by dissolving a Li salt in three different room-temperature ionic liquids (RTILs) and also in a conventional organic solvent. The cathodic (electrochemical reduction) stability of these electrolytes is compared at both ambient and elevated temperature by potential cycling on a TiO2-B electrode. At room temperature, the stability of pyrrolidinium- and piperidinium-based RTILs is comparable with that of the carbonate-based organic solvent, which is in contrast to the severely decomposed imidazolium-based RTIL. At elevated temperature (120 °C), the imidazolium-based RTIL undergoes even more significant cathodic decomposition that results in the deposition of a resistive surface film and leads to eventual cell degradation. By contrast, the cathodic decomposition and concomitant film deposition are not serious with pyrrolidinium- and piperidinium-based RTILs even at this high-temperature, so that the TiO2-B/Li cell operates with reasonably good cycle performance. The latter two RTILs appear to be promising solvents for lithium-ion batteries that are durable against occasional exposure to high-temperature.

Original languageEnglish
Pages (from-to)1068-1074
Number of pages7
JournalJournal of Power Sources
Volume194
Issue number2
DOIs
Publication statusPublished - 2009 Dec 1

Bibliographical note

Funding Information:
The study was supported by the WCU program through KOSEF funded by the Ministry of Education, Science and Technology (400-2008-0230). The authors also wish to acknowledge the Research Center for Energy Conversion and Storage for financial support.

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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