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Figure 3: Voltage profiles and the corresponding in situ optical images of Li deposition morphologies under different conditions. (a) The voltage profiles of in situ cells and deposition morphologies of Li in 1m electrolyte at room temperature. After half an hour, Li dendrites grew up explosively, just like a tree branch. (b) The voltage profiles of in situ cells and deposition morphologies of Li in 1m electrolyte at 60°C. The explosive growth of Li dendrites was greatly suppressed, and three dendrites fused into one gradually (the red arrows). (c) The voltage profiles of in situ cells and deposition morphologies of Li in 3m electrolyte at room temperature. The anode surface was rough and coarse. (d) The voltage profiles of in situ cells and deposition morphologies of Li in 3m electrolyte at 60°C. The anode surface was dense and smooth without Li dendrites.