Figure shows the current density as a function of time during a chronoamperometry (CA) at an oxidation potential of 4.19 V during 150 seconds, performed after the CV (Figure ). The fact the current density does not vanish, indicates the presence of a remainder Li 2 O 2 deposit on the HOPG surface. This is also confirmed by the AFM image (Figure ), where the presence of this deposit is visualized. The size of the holes on the deposit increases during the oxidation process, and new holes appear, particularly near the step edges. In Figure , the topographic profiles after the CA, reveals a slight decrease of the deposit roughness, suggesting a reduction in the particle height due to oxidation. These results agree with the scenario proposed by Byon et al., where the thinner parts of the Li 2 O 2 deposit oxidize first, forming the small holes, while the broader parts oxidize in the lateral direction, being a limitation for the charge transport toward the Li 2 O 2 surface.