fig2

Figure 2. (A) CE in Li||Cu cells by Aurbach’s test method with Li stripping/plating at 0.5 mA cm^-2 and 1 mAh cm^-2. The lithium plating/stripping behaviors of Li||Li symmetric cells at (B) 0.5 mA cm^-2 and 1 mAh cm^-2 and (C) 1 mA cm^-2 and 3 mAh cm^-2. SEM image of the Li anode after Li plating/stripping at 1 mA cm^-2 and 3 mAh cm^-2 in (D) the base electrolyte and (E) LiDFOB-contenting electrolytes. (F) Nyquist plots of Li||Li cells after cycling for 400 h at 1 mA cm^-2 and 3 mAh cm^-2 in the electrolyte with and without LiDFOB additive. (G) XPS spectra of O 1s, C 1s, F 1s, P 2p, and P 2s/B1s for the cycled Li anode in different electrolytes.