【摘要】 采用氧化石墨烯（Graphene oxide,GO）与固相法制备的Li₂Ru_0.6Mn_0.4O₃复合得到Li₂Ru_0.6Mn_0.4O₃/GO复合电极材料,并利用X射线衍射（X-ray diffraction,XRD）、扫描电子显微镜（Scanning electron microscope,SEM）、透射电子显微镜（Transmission electron microscope,TEM）和能谱仪（Energy dispersive spectrometer,EDS）分别对其晶体结构、形貌进行了表征。氧化石墨烯不仅可以改善Li₂Ru_0.6Mn_0.4O₃的导电性,而且可减小其在电解液中因溶解而发生的副反应。电化学测试表明:复合后电极材料的循环性能和倍率性能得到了明显的改善,200圈以后容量依然为初始容量的87.5%;5C大倍率的充放电后,电流密度回到0.1C时,容量保持在初始容量的95%以上。更多还原

【Abstract】 Li₂Ru_0.6Mn_0.4O₃/Graphene oxide（GO）composite material is obtained by mixing GO and the solid-state prepared Li₂Ru_0.6Mn_0.4O₃.The microstructure,morphology and electrochemical performances of product are analyzed by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive spectrometer（EDS）and electrochemical tests.Mildly oxidized graphene oxide mixing is found to improve the battery performance by enhancing the conductivity and protecting the cathode surface from undesired reactions with the electrolyte.The electrochemistry results show that the material exhibits better rate capacity than that of Li₂Ru_0.6Mn_0.4O₃ since the composite GO demonstrates the enhanced electronic conductivity.Accordingly,Li₂Ru_0.6Mn_0.4O₃/GO exhibits 87.5% capacity retention after 200 cycles in the cycling test,and at a large current of 5C,Li₂Ru_0.6Mn_0.4O₃/GO is able to deliver 95% of the 0.1Ccapacity.更多还原