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采用静电自组装方法,分两步合成Fe(OH)3/GO前驱体(GO:氧化石墨烯),再通过水热反应和600°C高纯氮气气氛下煅烧,获得了Fe3O4/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Fe3O4/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1390 mAh·g-1,50次循环后容量为819 mAh·g-1.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.
The Fe (OH) 3 / GO precursor (GO: graphene oxide) was synthesized by electrostatic self-assembly method in two steps and then calcined by hydrothermal reaction and high purity nitrogen atmosphere at 600 ° C to obtain Fe3O4 / graphene composite Materials.According to the analysis of X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and Raman spectroscopy, we found that the composites have three-dimensional porous graphene network structure.The synthesized The Fe3O4 / graphene composites as lithium ion battery cathode material, electrochemical test results show that it has excellent electrochemical properties: the first discharge capacity of 1390 mAh · g-1, after 50 cycles capacity of 819 mAh · g- 1. The comparative experiments show that the formation of three-dimensional graphene network structure plays a key role in the electrochemical cycling stability of the composites.