Methyl difluoroacetate inhibits corrosion of aluminum cathode current collector for lithium ion cells

Tetsuya Kawamura, Takaaki Tanaka, Minato Egashira, Izumi Watanabe, Shigeto Okada, Jun Ichi Yamaki

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Cathode current collectors made of aluminum are corroded by LiN(SO 2CF3)2/ethylene carbonate + dimethyl carbonate (1:1 in volume ratio) electrolyte above 3.7 V. Therefore, the electrolyte cannot be used for 4 V lithium rechargeable batteries. By contrast, LiN(SO 2CF3)2/methyl difluoroacetate (CHF 2COOCH3, MFA) electrolyte showed good inhibition of aluminum corrosion, and a Li/LiCoO2 cell with an aluminum cathode current collector exhibited good cycle performance when the LiN(SO 2CF3)2/MFA electrolyte was used. X-ray photoelectron spectroscopy of the aluminum surface treated by LiN(SO 2CF3)2MFA electrolyte showed that the inhibition of corrosion derives from a passivation film made of an organic compound on the aluminum surface.

Original languageEnglish
Pages (from-to)A459-A463
JournalElectrochemical and Solid-State Letters
Volume8
Issue number9
DOIs
Publication statusPublished - 2005

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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