中文摘要：

对溶剂化的石墨烯薄膜进行冷冻干燥处理得到改性的石墨烯薄膜,这种处理可以降低干燥过程中石墨烯片层之间严重的再堆叠.结果表明改性的石墨烯薄膜具有更多的折皱和更大的层间距,并提高了电化学性能.在电流密度为50 mA·g~（-1）时,该电池首次循环的放电和充电比容量分别为1189.3和645.2 mAh·g~（-1）,400次循环后充电比容量仍然超过305 mAh·g~（-1）,显著高于使用传统真空过滤得到的石墨烯薄膜的电化学性能.此外,相对于传统的石墨电极（包括活性物质、聚合物粘结剂和导电集流体）,石墨烯薄膜电极的质量和成本有明显的下降.

英文摘要：

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.