To find the potentials of interest, linear sweep voltammetry (LSV) from open circuit potential (OCP) to 0.1 V vs. Li QRE at 5 mV/s is shown in Figure for different concentrations of the H2O additive. We note that there are 2 peaks that systematically change with the water concentration, i.e. the reaction at ~1.3 V, which increases with increasing the amount of water, and the reaction at ~1.7 V, which increases and shifts to ~1.95 V (SI-2). We note here that the current density of these peaks is still a few factors smaller than those typically found for the electrochemical reduction of (100 ppm of) HF . The behavior of both these peaks is consistent with the results of Aurbach et al. upon the addition of water, where it should be noted that in that work the peak around ~1.7 V was also affected by the presence of oxygen (see methods). The inset of Figure shows a cyclic voltammogram (CV) at 5 mV/s for 10 cycles for the 25 mM electrolyte. Strikingly, we observe that the peak at ~1.3 V is passivated in the second cycle, as in reference , but reappears and splits in subsequent cycles.