减少再堆叠改性的石墨烯薄膜在锂离子电池中的应用(英文)  

Improved Graphene Film by Reducing Restacking for Lithium Ion Battery Applications

作　　者：杨晓伟[1] 何雨石[1] 廖小珍[1] 马紫峰[1] 

机构地区：[1]上海交通大学化学工程系,上海200240

出　　处：《物理化学学报》2011年第11期2583-2586,共4页Acta Physico-Chimica Sinica

基　　金：supported by the National Key Basic Research Program of China(2007CB209705);National Natural Science Foundation of China(21006063,21073120);Science and Technology Commission of Shanghai Municipality,China(10DZ1202702)~~

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.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.

关 键 词：石墨烯薄膜 冷冻干燥 再堆叠 电极 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动] O484[理学—固体物理]