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 (LiTFSI) < lithium bis(perfluoroethanesulfonyl)imide (LiBETI) < LiPF 6 < LiBF 4 . With LiBF 4 , no corrosion current is observed until 110 ° C . X-ray photoelectron spectroscopy study reveals that this Al surface is covered by Al–F compound (presumably AlF 3 ). Due to the formation of a highly passivating AlF 3 layer in this electrolyte, the high voltage LiNi 0.5 Mn 1.5 O 4 positive electrode coated on Al foil can be successfully cycled at 65 ° C without electrode failure.
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Mun et al. (2010) studied this question.
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