石墨烯及其复合自支撑膜研究进展

作为新一代超级电容器电极材料,石墨烯具有比表面积高、化学稳定性和力学性能优异等特点。但是,制备致密度高、结构稳定性好的石墨烯电极时往往需要添加黏结剂,而黏结剂的引入会削弱电极材料的电化学性能,制备石墨烯及其复合自支撑膜是解决该问题的有效手段之一。介绍了石墨烯自支撑膜的成膜方法,包括抽滤诱导自组装、气液界面自组装、涂覆法和层层自组装等传统方法,以及一种新颖的低温旋切成膜方法。着重总结了导电聚合物/石墨烯、金属氧化物/石墨烯及三元石墨烯基复合膜的研究进展。提出了石墨烯及其复合自支撑导电膜未来的发展趋势,包括开发新型、简便、量产的薄膜电极制备技术、控制石墨烯及其复合自支撑膜的微观结构、将各种成膜方法运用于制作便携式电子器件或柔性电池中等。

Research Progress on Graphene and Its Composite Free-Standing Films

Graphene is an electrode material for the new generation of supercapacitors with high specific surface area,excellent chemical stability and mechanical properties.However,the binder is usually added to obtain the graphene electrodes with chemical stability and high density,which will affect the electrochemical performance of the electrods.The free-standing graphene and its composite film is one of the effective ways to solve the problem.The formation methods of graphene free-standing film were introduced,including traditional methods such as suction filtration induced self-assembly,gas-liquid interface self-assembly,coating and layer by layer self-assembly and a novel low-temperature rotary method.The research progress of graphene-based conductive composite films including conductive polymers/graphene,metal oxides/graphene and multi-component composite films was mainly summarized.The future development trends of graphene and its composite free-standing conductive films were proposed,including the development of the new,simple and scaled preparation technology for film electrodes,effective controls of the microstructure of graphene and its composite free-standing films,and applications of various film forming methods in portable electronic devices or flexible batteries.