Figure shows the CV of the cell in 0.5 M LiTFSI/DMSO saturated with O 2 and Ar. The scan rate was 50 mV/s from the OCP (-3 V) up to 2,0 V for the cathodic scan and from 2.0 V up to 4.8 V for the anodic scan. The CV for the O 2 reduction show a two cathodic peaks at 2.80 V and 2.57 V, attributed to the reduction of O 2 to LiO 2 and Li 2 O 2 , respectively. The anodic branch of the CV exhibits three peaks at 3.64 V, 4.19 V, and 4.53 V of lower intensity, indicating that the species formed during the ORR are not fully oxidized during the OER. The first peak was assigned to the oxidation of LiO 2 and the other two to the oxidation of Li 2 O 2 . No peaks were observed in the CV when the electrolyte saturated with Ar.