The electrochemical stability of copper substrate was studied in three different lithium-ion battery electrolytes. Cyclic voltammetry was used to study the oxidation-reduction behavior of copper in these electrolyte solutions. The reduction of electrolyte and its effect on the oxidation of copper was also studied. Bulk electrolysis was used to quantitatively study the dissolution of copper in dry electrolytes and in electrolytes doped with impurities of H 2 O or HF. The stability of copper was closely related to the composition of the electrolytes. Impurities dramatically increased the oxidation tendency of copper.
Many techniques are available for the determination of diffusion coefficients of ions in aqueous solutions. A review of classical and modern techniques is presented. Non-electrochemical methods are discussed briefly. Electrochemical methods reviewed include chronoamperometry, chronopotentiometry, polarography, and h drod namics. Selected values of the diffusion coefficients determined by these electrochemical methods of the metallic ions Ag', Bi XI , Cd Y, , Cu", In"', Pb", TI', and Zn" are presented.
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