Electrochemistry of Noble Metal Electrodes in Aprotic Organic Solvents ContainingLithium Salts

摘要

The electrochemical behavior of various non-aqueous organic electrolyte systemshas been investigated using inert metal electrodes. The system studies included propylene carbonate, dimethoxyethane and tetrahydrofuran solutions of LiC10, LiAsF6, LiSO3CF3 and Bu4NC104. The electrode metals included polycrystalline gold and silver. Various techniques including cyclic voltammetry, FTIR and XPS were used to characterize the main electrochemical reactions that occur in these systems. Several separate film forming processes have been identified, including reduction of solvent, the salt, and traces of oxygen and water. The surface films formed in these processes lead to the apparent stability of these systems at low potentials. Li UPD was also examined and was found to be controlled by the nature of the surface films through which lithium is deposited.