Methyl Difluoroacetate Inhibits Corrosion of Aluminum Cathode Current Collector for Lithium Ion Cells

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