with the fractured surface visible. The lithium foil was supported by a stainless-steel sample holder that also served as the current collector. The sample was then loaded into a custom-built mechanical air-free sample transfer system to transport between the glovebox and a FEI Helios NanoLab 600i FIB/SEM system. The air-free transfer system was observed to have water and oxygen contaminants lower than 0. was connected to the stainless-steel current collector and microprobe via an electrical feedthrough in the FIB/SEM system. The tungsten probe acted as the working electrode, and the lithium-metal foil served as the counter electrode in a two-electrode cell configuration. The tungsten probe was cut using the FIB system to have the shape of a truncated cone with the terminal end having a diameter of 5-8 µm. The sample holder was electrically isolated from the FIB/SEM stage and grounded to avoid any ground loop or static charging issues. The electronic resistance of the tungsten probe and sample stage combined was measured to be less than 20 Ω.