Chemical Diffusion Coefficient of Lithium in Carbon Fiber

In order to obtain safer and more reversible negative electrodes for lithium secondary batteries, intensive research on various carbon materials, such as pyrolytic carbon, polyacrylonitrile- (PAN) based carbon, petroleum coke-based carbon, pitch-based carbon, etc., has been carried out in recent years. Electrochemical investigations on coal pitch-based carbon fiber (heat-treated at 2,800 C) were carried out. The open-circuit voltages of the Li{vert_bar}Li{sub x}C{sub 6} cell were lower than 0.15 V vs. Li/Li{sup +} in the range of 0.15 0.2.« less