▎ 摘　　要

We prepared improved graphene films by freeze drying solvated graphene films, which greatly reduced the serious restacking of graphene layers when they were face-to-face stacked. The results show that the improved graphene film had more corrugations and a larger interplanar distance than the usual graphene films prepared by vacuum filtration leading to improved electrochemical performance. The discharge and charge capacities of the battery were 1189.3 and 645.2 mAh.g(-1), respectively, for the first cycle at 50 mA.g(-1) and the charge capacity remained above 305 mAh.g(-1) after 400 cycles. These values are higher than those of the graphene film prepared by vacuum filtration. Moreover, the mass and cost of the electrode were reduced significantly compared with the commercial graphite-based anode, which is made by coating a mixture of an active material, a polymeric binder, and an electric current collector.