ELECTROCHEMICAL LITHIUM-DOPING OF OIL COKE THERMOTREATED IN AIR

A procedure is developed for a prolonged thermal treatment of coke pow ders in air. Variations in the structure and electrochemical propertie s of the coke that are caused by the calcining are studied. The charge -discharge curves and cyclic voltammograms are presented for electrode s prepared from oil coke, in solutions of lithium salts in aprotic sol utions. The degree of the electrolyte decomposition, occurring over th e course of the electrochemical lithium-doping of cokes, is estimated. The thermal treatment is found to facilitate an increase in the rever sible capacity and promote stability of the electrode operation during the cycling process. This is probably connected with alterations in t he energy state and morphology of the surface of coke particles.