GS-SSCNTs-MnNPs复合材料的制备与锂离子电池负极性能研究

在超声环境下,采用强氧化法将多壁碳纳米管(MWCNTs)切割成长径比小于5的超短碳纳米管(SSCNTs),通过简单的湿化学法将其与MnO_x纳米颗粒(Mn_xNPs)植入还原性氧化石墨烯片层中,热处理后,形成GS-SSCNTs-MnNPs纳米复合材料.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X-射线衍射(XRD)等制备材料的形貌结构,采用循环伏安和恒流充放电研究其锂离子电池负极性能.结果表明:GS-SSCNTs-MnNPs纳米复合材料在180 mA?g^-1电流密度下具有高达1 100 mA?h?g^-1的可逆容量,且表现出优异的功率和循环稳定性能,循环100圈之后,仍具有高达837 mA?h?g^-1的可逆容量(1 440 mA?g^-1).

The Preparation of Graphene/Super Short Carbon Nanotubes/MnO2 Nanocomposites as and Anode Performance of Lithium-Ion Batteries

Multiwalled carbon nanotubes(MWCNTs)are cut into super short carbon nanotubes(SSCNTs)with aspect ratio of less than 5by using strong oxidation method under ultrasonic environment.RGO-SSCNT-MnO₂nanocomposites are designed by a simple wet chemical method and heat treatment,which makes SSCNTs and MnO_xnanoparticles(Mn_xNPs)into RGO layers.The morphology of nanocomposites is investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray diffraction(XRD).The performanceof anode is studied by cyclic voltammetry and constant current charge/dischargefor lithium-ion batteries.The results show that the composites have a reversible capacity of 1 100 mA?h?g^-1in the current density of 180 mA?g^-1,and exhibite excellent power and cycling stabilities.After 100 cycles in current density of 1 440 mA?h? g^-1,the compositesstill have a reversible capacity of 837 mA?h? g^-1.