Effects of Li Solvation Structures on Aluminum Corrosion in Ether-Based Electrolyte Solutions with Lithium Bis(Fluorosulfonyl)imide (LiFSI).

Lithium bis(fluorosulfonyl)imide (LiFSI) is widely used in lithium-metal batteries to form a stable lithium fluoride (LiF)-based solid electrolyte interphase (SEI). However, the FSI⁻ itself fails to create a protective passivation layer on aluminum (Al) current collectors, leading to Al⁺ dissolution and severe corrosion. While fluorinated ether solvents have shown promise in mitigating Al corrosion, the mechanisms remain unclear.