Since it was described for the first time by Abraham and Jiang in 1996, the Li-O 2 battery (LOB) has attracted enormous research attention, aiming to approach its outstanding theoretical energy density, close to 3500 Wh.kg , needed to improve the autonomy of electrical vehicles beyond the limit imposed by the Li-ion batteries. It is now well-known that there are important technical challenges for developing any practical LOB, namely, high charge potential, low discharge capacities, and poor electrolyte and cathode stability that strongly limit discharge-charge cycle efficiency and power density. The mechanisms of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in a LOB operating with aprotic solvents have been clarified by several authors. Thus, the ORR discharge reaction leading to the formation of Li 2 O 2 on the cathode can occurs through surface or solution routes where, in both cases, the first step is the reduction of O 2 to the superoxide radical