Chem.J.ChineseUniversities,2023,44(2),2022046220220462(1/8)CHEMICALJOURNALOFCHINESEUNIVERSITIES高等学校化学学报研究论文CoO纳米颗粒/石墨烯纳米纤维复合材料的制备及电化学性能胡诗颖,沈佳艳,韩峻山,郝婷婷,李星(宁波大学材料科学与化学工程学院,宁波315211)摘要用石墨烯和Co(CH3COO)2·4H2O作为原料,利用超声辅助法合成了锂离子电池的负极材料CoO纳米颗粒/中空石墨烯纳米纤维复合物.采用X射线衍射(XRD)确定材料的物相组成,采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察材料的表面形貌和微观结构,采用X射线光电子能谱(XPS)确定材料的价态结构.采用循环伏安、恒电流充放电和交流阻抗谱表征材料的电化学性能.结果显示,在100mA/g的电流密度下,循环了160次后,可逆容量仍超过800mA/g,库仑效率保持在99%以上.该材料优异的电化学性能主要归因于石墨烯的中空纤维结构,中空内部可以容纳电解液,能直接将离子输送到颗粒表面,实现了离子的快速传输;二维中空纤维搭建成三维网络结构,实现了三维电子传导网络.关键词中空石墨烯纳米纤维;负极材料;锂离子电池;电化学性能中图分类号O646文献标志码Adoi:10.7503/cjcu20220462PreparationofCoONanoparticles/HollowGrapheneNanofiberCompositesandItsElectrochemicalPerformancesHUShiying,SHENJiayan,HANJunshan,HAOTingting,LIXing*(SchoolofMaterialsScienceandChemicalEngineering,NingboUniversity,Ningbo315211,China)AbstractUsingthegraphenesandCo(CH3COO)2·4H2Oasrawmaterials,theCoOnanoparticles/hollowgraphenenanofibercompositesweresynthesizedbytheultrasound-assistedmethodastheanodematerialsforlithium-ionbatteries.X-raydiffraction(XRD)wasusedtodeterminethephasecompositionsofthematerials,scanningelectronmicroscope(SEM)andtransmittingelectronmicroscope(TEM)wereusedtoobservethesurfacemorphologiesandmicrostructuresofthematerials,andX-rayphotoelectronspectroscopy(XPS)wasusedtodeterminethevalencestructuresofthematerials.Cyclicvoltammetry,galvanostaticchargeanddischarge,andACimpedancespectroscopytestswereperformedonthematerialstocharacterizeitselectrochemicalperformances.Theelectrochemicalperfor⁃mancesofthecompositematerialsshowedthatthereversiblecapacitystillexceeded800mA/gandthecoulombiceffic...