石墨烯复合材料作为高性能锂离子电池负极材料.pdf

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1、物理化学学~(WuliHuaxueXuebao1l650ActaPhys．一Chim．Sin．2014，301，1650-1658September[Article]doi：10．3866／PKU．WHXB201406181www．whxb．pku．edu．ell静电自组装方法合成的具有多孔三维网络结构的Fe3O4，石墨烯复合材料作为高性能锂离子电池负极材料刘建华’刘宾虹L李洲鹏(浙江大学材料科学与工程系，杭州310027；浙江大学化学与生物工程系，杭州310027)摘要：采用静电自组装方法，分两步合成Fe(OH)dGO前驱体(GO：氧化石墨烯)，再通过水热反应和600

2、。C高纯氮气气氛下煅烧，获得了FesOd石墨烯复合材料．通过X射线衍射(XRD)、扫描电镜(SEM)、高分辨透射电镜(HRTEM)、拉曼(Raman)光谱等多种分析，发现该复合材料具有三维多孔石墨烯网络结构．把合成的这种Fe。Od石墨烯复合材料作为锂离子电池负极材料．电化学测试结果表明其具有优良的电化学性能：首次放电容量为1390mAh·g～，50次循环后容量为819mAh·g一．通过对比实验表明，三维石墨烯网络结构的形成对复合材料的电化学循环稳定性起着关键作用．关键词：FeaOd石墨烯复合材料：自组装：锂离子电池负极材料；循环稳定性；速度容量中图分类号：0646Fe3

3、OdGrapheneCompositeswithaPorous3DNetworkStructureSynthesizedthroughSelf-AssemblyunderElectrostaticInteractionsasAnodeMaterialsofHigh-PerformanceLi-IonBatteriesLIUJian—Hua’LIUBin—Hong’LIZhou—PengfDepatmentofMaterialsScience＆Engineering,ZhejiangUniversity,Hangzhou310027,R．China；Departmento

4、fChemical＆BiologicalEngineering,ZhejiangUniversity,Hangzhou310027,R．China、Abstract：Fe3Odgraphenecompositeswithaconductive。porousthree—dimensional(3D)graphenenetworkweresynthesizedthroughafacilemethod．Inthepreparationprocess，Fe(0H)3colloidwasformed／nsitubyaddingFeCI3solutiontoaboilinggrap

5、heneoxide(GO)suspension，withFe(OH)dGOprecipitatedbecauseoftheelectrostaticinteractionbetweenthetwocomponents．TheprecipitatewasseparatedandaddedtoasecondG0suspensiontoachieveadditionalGOencapsulation．ThisseIf-assembledFe(OH)dGOprecursorwasthenhydrothermalyandheattreated．resultingintheform

6、ationofFe3Odgraphenecomposites．X-raydi仟raction(XRD)，scanningelectronmicroscopy(SEM)，high—resolutiontransmissionelectronmicroscopy(HRTEM)，andRamanspectroscopyresultsrevealedthattheFe3Odgraphenecompositespossessafavorable3Dporousgraphenenetworkembedding50一f0100-nm—sizedFe3CI4nanopadicles．T

7、heFe3OdgraphenecompositesexhibitgoodelectrochemicaIperformanceasananodemateriaIforLi-ionbakeries．TheelectrodecomposedoftheFe3OJgraphenecompositedeliveredacapacityof1390mAh·gforthefirstlithiationandretainedacapacityof819mAh·g～after50cycles．Theelectrodesalsoexhibitedgoodrat