Authors : S. Tolani
Page Nos : 1295-1304
Description :
Cycling performance of Li-ion cell was studied by using electrochemical impedance spectroscopy (EIS). The stability of uncoated copper (Cu) foils and graphite-coated copper (Cu-C) foils in lithium-ion battery electrolytes were extensively studied in this paper. The electrochemical behavior and stability of the Cu foils and Cu-C foils were studied. Cyclic voltammetry was used to study the redox behavior of the foils in the 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 the foils in dry electrolytes and in electrolytes doped with impurities of H2O or HF. It was found that the graphite coating greatly influenced the redox behavior of the copper substrate and provided some protection to the copper from oxidation. Impurities increases the oxidation tendency of both Cu foils and Cu-C foils and may influence the integrity of the Cu-C foil electrode. A lithium-ion battery is a family of rechargeble battery types in which Lithium ions move from the negative electrode to the positive electrode during discharge, and back when charging. Li-ion batteries use anintercalated lithium compound as the electrode material, compared to the metallic lithium used in the non-rechargeble lithium battery.
