Faradaic adsorption of Li on carbon. A novel concept for the capacity of the anode of the Li-ion secondary batteries

Use of Faradaic adsorption (FAd) of lithium on the carbon surface is a novel concept proposed by us for providing an additional capacity for the carbon anode of Li-ion secondary batteries. Since the capacity is, in general, proportional to the effective specific surface area, implying that an active carbon having a very high specific surface area is expected to provide a very large adsorption capacity. Issues in the FAd process have been found in its poor reproducibility and cycleability. In the present paper, the condition to obtain a stable high current CV peak was examined in detail. We found that cleaning the surface and maintaining a good electrical contact are the most important key factors.