Improving the performance of graphite anodes in rechargeable lithium batteries

A low cost graphite was examined as a negative electrode for rechargeable Lithium batteries. The use of an electrolyte solution consisting of LiPF6 (1 mol dm(-3)) in ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 2:1 resulted in a capacity loss of 35% on the first cycle. When small quantities of dimethyl pyrocarbonate (DMPC) were added to the binary electrolyte system, the capacity loss on the first cycle was only 18% and thereafter a practical capacity value of 357 mA h g(-1) was sustained for more than 50 cycles, representing more than 2000 h of cycling. (C) 1998 Elsevier Science S.A. All rights reserved.