Abstract
Effect of fluoride additives was investigated in organic solvents containing LiCF 3SO 3 to prevent the corrosion of aluminum current collector for lithium ion batteries. LiClO 4 was also examined for comparison. Among examined LiBF 4, LiPF 6, LiAsF 6, LiSbF 6 and LiClO 4, LiBF 4 was the best additive to suppress the corrosion of aluminum because its oxidation potential is close to that of CF 3SO − 3 anion. Corrosion currents for aluminum in a complex fluoride- or LiClO 4-added solvents became smaller in the order, LiSbF 6>LiAsF 6>LiClO 4>LiPF 6>LiBF 4. Oxidation potential of ClO − 4 is nearly the same as that of CF 3SO − 3. However, the corrosion currents were similar to or slightly larger than those observed in LiPF 6-added solvents. SEM images of electrochemically oxidized aluminum samples indicated that the level of corrosion well coincided with the observed corrosion currents. The corrosion mechanism of aluminum was also proposed.
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