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Figure 4: Characterization of Li-metal deposition by ex situ SEM. Li was plated on copper foil at the current density of 1 mA cm-2 with a fixed capacity of 2 mAh cm-2 in 1m and 3m electrolytes at different temperatures. (a) Top-view SEM images of deposition morphology of Li in 1m electrolyte at 27°C; (b) 1m electrolyte at 60°C; (c) 3m electrolyte at 27°C; (d) 3m electrolyte at 60°C.