Performance and thermal stability of LiCoO2 cathode modified with ionic liquid

Sang Young Lee, Hyun Hang Yong, Seok Koo Kim, Je Young Kim, Soonho Ahn

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A unique approach for improving the thermal stability of LiCoO2 cathode is presented, which is based on the treatment of LiCoO2 with ionic liquid (BDMIPF6, butyldimethylimidazolium-hexafluorophosphate), instead of traditional electrolyte modification. The electrolyte modification by the BDMIPF6 addition deteriorates the C-rate performances especially at high charge/discharge rates, with slightly improving the exothermic reaction between delithiated (charged) LiCoO2 and electrolytes. On the other hand, the BDMIPF6-modified cathode noticeably improves the thermal stability as well as little changes the C-rate performances. This is believed mainly due to the preferential location of BDMIPF6 in the LiCoO2 cathode rather than in the carbon anode, which might make it possible that the BDMIPF6 could effectively contribute to the suppression of exothermic reaction of delithiated LiCoO2 with electrolytes, with little affecting the electrolyte and the carbon anode.

Original languageEnglish
Pages (from-to)732-735
Number of pages4
JournalJournal of Power Sources
Volume146
Issue number1-2
DOIs
Publication statusPublished - 2005 Aug 26

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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