Fig. 4
Investigation of the stability of lithium metal anode in Li|Li symmetric cells. a The cycling performances and voltage profiles of lithium plating/stripping in the Li|Li symmetric cells. The current density was 1 mA cm−2. The insets are the illustration images of the lithium anodes. b–d scanning electron microscope (SEM) images of the lithium metal after 50 cycles in b TEMPO electrolyte, c DEGDME electrolyte, and d IL-TEMPO electrolyte. Scale bars are 10 µm in b–d. e The schematic illustration of the SEI formation on lithium metal anode within the IL-TEMPO electrolyte
