四氧化三铁/石墨烯纳米复合材料的静电自组装制备及储锂性能  

Colloid Electrostatic Self-assembly Synthesis of Ferroferric Oxide/Reduced Graphene Oxide Nanocomposites for Lithium Storage

作　　者：王艳坤 WANG Yankun(College of Economic Environment,Henan Finance University,Zhengzhou 450046,China)

机构地区：[1]河南财政金融学院环境经济学院,郑州450046

出　　处：《材料导报》2021年第16期16008-16014,16020,共8页Materials Reports

基　　金：国家自然科学基金(21373189);河南省科技计划项目(212102311111)。

摘　　要：采用一种简单便捷的溶胶静电自组装技术,经高温煅烧还原制得四氧化三铁/还原氧化石墨烯纳米复合材料(FGCM)。经X射线衍射技术(XRD)、透射电子显微镜(TEM)、热重分析技术(TGA)、傅里叶变换红外光谱(FT-IR)、拉曼(Raman)光谱、X射线光电子谱(XPS)及N 2吸附-脱附实验等方法对复合材料的结构、组成及形貌进行了表征。结果显示,粒径约7 nm的球状Fe_(3)O_(4)颗粒均匀紧密地分散在还原氧化石墨烯(rGO)褶皱状表面,从而有效地避免了Fe_(3)O_(4)颗粒的团聚。将制备的FGCM作为锂离子电池负极材料研究其锂电性能,由于Fe_(3)O_(4)和rGO两组分之间的协同效应,在100 mA·g^(-1)的充放电流密度下,其首次放电比容量高达1405 mAh·g^(-1),经100次充放电循环后其放电比容量仍高达663 mAh·g^(-1)。此外,复合材料亦呈现持久的循环稳定性与优异的倍率性能。研究表明,FGCM是一种集石墨烯和四氧化三铁的优点于一体的优良的锂离子电池负极材料。Asimple and fast colloid electrostatic self-assembly method which followed a heat treatment process was adopted to prepare the ferroferric oxide/reduced graphene oxide composite nanomaterials(FGCM).The crystal structure,chemical composition and morphology of as-synthesized nanocomposites were characterized by X-ray diffraction(XRD),thermogravimetric analysis(TGA),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),Raman microscopy,X-ray photoelectron spectroscopy(XPS)and N 2 adsorption-desorption experiments.The analyses showed that spherical Fe_(3)O_(4) particles about 7 nm were loaded uniformly and tightly onto reduced graphene oxide(rGO)sheets surface,and,as a result,the aggregating of the Fe_(3)O_(4) nanoparticles was effectively prevented.The electrochemical properties of FGCM were investigated for a potential anode material in lithium-ion batteries(LIBs).FGCM showed a high specific capacity of 1405 mAh·g^(-1) in the initial discharge at current density of 100 mA·g^(-1),the specific capacitance still retained as high as 663 mAh·g^(-1) even after 100 cycles because of synergistic effect between the pure Fe_(3)O_(4) and rGO components.In addition,the composites also presented significantly durable cycling stability and superior rate capability.These results indicate that the FGCM is a promising electrode material which combines the advantages of graphene and ferroferric oxide for high performance LIBs.

关 键 词：石墨烯 四氧化三铁 静电自组装 复合材料 锂离子电池 

分 类 号：O648.1[理学—物理化学]