Abstract
Several WCL6-graphite intercalation compounds (GICs) were prepared by heating graphite and WCL6 in a vacuum-sealed glass tube at 400°C. The cathodic behavio of WCL6-GIC was investigated by the galvanostatic and cyclic voltammetric measurements in non-aqueous solutions (1 mol·dm-3 LiClO4 in propylene carbonate (PC) or dimethyl sulfoxide (DMSO)). Electrochemical lithium insertion proceeded in two steps as was the case for CrO3- and MoCl5-GICs. The first and the second lithium insertion steps were considered to correspond to the insertion of desolvated Li+ ion and that of solvated Li+ ion, respectively. The first step was more reversible than the second one. The insertion of solvated Li+ ions to WCL6-GIC might increase the irreversibility of insertion/extraction process of lithium.
