Fe3O4/RGO复合材料的制备及其电化学性能研究

Synthesis of Fe_3O_4/RGO composites and their electrochemical performance

以改进Hummers法合成的氧化石墨烯(GO)为前驱体,通过水热法结合烧结工艺制备了四氧化三铁/还原氧化石墨烯(Fe_3O_4/RGO)复合材料。利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)等手段对复合材料的理化性能进行表征;通过充放电测试、循环伏安(CV)和电化学阻抗谱(EIS)等技术,综合考察了材料的储锂性能及电化学性能增强机制。结果表明,在200和600 m A/g电流密度下,Fe_3O_4/RGO复合负极循环60次后的放电比容量分别保持在709和479 mAh/g,表现出良好的倍率性能;相较于纯Fe_3O_4负极,复合负极呈现出更优异的锂电性能,其电化学性能的改善得益于RGO能增强材料的电导性和结构稳定性。

With reduced graphene oxide （RGO） as the precursor, Fe3O4/RGO composites were synthesized via a hydrothermal method combined with annealing treatment;the crystalline phase, microstructure and component of Fe3O4/RGO composites were characterized by XRD, SEM, TEM and Raman spectra.As a new type of lithium battery electrode materials, their electrochemical performance and the corresponding performance enhanced mechanism were investigated by the CV and EIS tests.The results indicate that high loading Fe3O4/RGO anodes after charge-discharge 60 cycles show high reversible capacities of 709mAh/g at 200mA/g and 479mAh/g at 600mA/g, with a very good rate performance.Compared with the Fe3O4 electrodes, Fe3O4/RGO electrodes exhibit better electrochemical performance, which is associated with a synergy between the stable RGO matrix and its good conductivity;such a nano-sized configuration may not only facilitate the electron conduction but also help to maintain the structural integrity of active materials.