Unveiling the passivation and corrosion process of cathode aluminum current collector in lithium-ion battery

To ensure reliable deployment of stable high-voltage LIBs, investigating the corrosion behavior and underlying mechanism of the Al current collector is imperative. This research on Al corrosion in LiPF6 6 electrolyte indicates that the stability of the passivation layer (AlF3/Al2O3) 3 /Al 2 O 3 ) is significantly affected by the operating voltage. The corrosion resistance, R pit , displays a nonlinear distribution with a peak at 4 V, and pitting occurs beyond 4 V. The heterogeneous and wrinkled AlF3 3 layer triggers localized breakdown. The established model of pitting initiation and expansion is supported by morphological evolution, quantitative component analysis, and electrochemical test results.