碳纳米管与还原氧化石墨烯构建高倍率石墨电极

Constructing Graphite Electrode with High-Rate by Carbon Nanotube and Reduced Graphene Oxide

通过在金属铜箔上均匀排布碳纳米管宏观膜(carbon nanotubes(CNTs)macro film,CMF),制成复合集流体(Cu-CMF),从而改善活性物质与集流体的结合性,降低电池界面电阻,在活性材料石墨中掺杂还原氧化石墨烯(r GO),增大了活性物质石墨颗粒间的接触位点,最后获得高比容量和化学稳定性的电池。采用扫描电子显微镜和电化学测试对复合集流体的微观形貌及电化学性能等进行表征。结果表明,基于Cu-CMF复合集流体掺杂r GO的石墨电极,在2 C倍率下发挥101.5 m Ah·g^(-1)的比容量,是未掺杂基于铜箔集流体的石墨电极(26.3 m Ah·g^(-1))的3.7倍以上,表现出优异的倍率性能。

The interfacial resistance would be reduced significantly by coating carbon nanotubes(CNTs)macro film(CMF)on metallic copper foil for composite current collector(Cu-CMF),which will improve the adhesion between the active materials and current collectors.In addition,mixing the reduced graphene oxide(rGO)in graphite will further increase the contact area between the active materials.Thereby high specific capacity and electrochemical stability of the graphite electrode can be obtained.The microstructure and electrochemical properties of the electrodes were tested by SEM and electrochemical measurements.The results indicate that the graphite electrode has a specific capacity of101.5 m Ah·g^(-1)at a rate of 2C based on Cu-CMF current collector mixed with rGO,which is 3.7 times(26.3 m Ah·g^(-1))higher than that of the untreated graphite electrode with copper current collector.