Impedance Analysis for Oxygen Reduction in a Lithium Carbonate Melt

When the same experiment is performed in SO2C12-solvate mixed electrolytes, this potential difference de-creases to 570 inV. Figure 9b clearly indicates that the film is easier to remove in this electrolyte, since the first oxida-tion step occurs at a potential of 4.1 V against 4.4 V in SO2C12, LiA1C14 2M electrolyte. That leads us to suppose that this first oxidation step is due to the oxidation of free chlorides, since Li § ions are tied up as complexes with the solvate, whereas free chloride ions do not exist in the SO2C12 pure electrolyte. These results are in agreement with the previous data re-corded by impedance measurements, pointing out the ef-fect of the different morphology of the film obtained when solvate is present in the electrolyte. Conclusion