COKES AS NEGATIVE ELECTRODES IN SECONDARY BATTERIES

The lithium intercalated carbons (LixC6) have replaced the metallic li thium negative electrodes in secondary lithium batteries. In order to improve high energy density and long cycle life, it is necessary to fi nd those carbonaceous materials that have an excellent lithium interca lation and de-intercalation capacity. In this work, the electrochemica l behaviour of various cokes in ethylene carbonate (EC) and dimethyl c arbonate (DMC) electrolyte were investigated by charge and discharge c ycling processes and cyclic voltammetry technique. The petroleum coke (C342) has the highest capacity during cycling and the lowest irrevers ible capacity loss during the first cycle. Cyclic voltammetry revealed that the cycle efficiencies of three cokes are very high.