Linear-Sweep Thermammetry Study on Corrosion Behavior of Al Current Collector in Ionic Liquid Solvent

Abstract

The corrosion behavior of Al foil as the current collector for lithium-ion batteries is studied by linear-sweep thermammetry. The onset temperature for Al pitting corrosion depends on Li salt that is dissolved in an ionic liquid solvent; lithium bis(trifluoromethanesulfonyl)imide . With , no corrosion current is observed until . X-ray photoelectron spectroscopy study reveals that this Al surface is covered by Al–F compound (presumably ). Due to the formation of a highly passivating layer in this electrolyte, the high voltage positive electrode coated on Al foil can be successfully cycled at without electrode failure.