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以苯甲醇为溶剂,通过多壁碳纳米管(MWCNTs)上的芳环和苯甲醇苯环之间π-π共轭效应,自由的引入羟基基团,Fe3+静电吸附在MWCNTs网络结构的表面,进而溶剂热法一步合成Fe3O4/碳纳米管(Fe3O4/MWCNTs)“核-壳”复合材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和高倍透射电镜(HRTEM)对样品的结构和形貌进行表征,结果表明Fe3O4尺寸约为10nm,稳固地生长在碳纳米管壁上。Fe3O4/碳纳米管复合材料作为锂离子电池负极材料时呈现出优异的电化学特性:电极材料在充放电速率为0.1A/g下循环100次之后所达到的可逆比容量为487mAh/g,循环稳定性明显优于Fe3O4电极。且在2A/g的大电流密度条件下可达到的可逆比容量为389mAh/g。
With benzyl alcohol as the solvent, hydroxyl groups were introduced freely through the π-π conjugation between the aromatic rings on the MWCNTs and the benzene ring. The adsorption of Fe3 + on the surface of the network structure of MWCNTs, Then the Fe3O4 / CNTs (Fe3O4 / MWCNTs) “core-shell ” composites were synthesized by solvothermal method. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-power transmission electron microscope (HRTEM). The results showed that the size of Fe3O4 was about 10 nm and grew steadily on the wall of carbon nanotubes. Fe3O4 / carbon nanotube composites exhibit excellent electrochemical performance as negative electrode materials for lithium ion batteries: the reversible capacity reached 487mAh / g after the electrode material is cycled 100 times at a charge / discharge rate of 0.1 A / g, and the cycle The stability is obviously better than Fe3O4 electrode. And the reversible capacity achievable at a high current density of 2 A / g is 389 mAh / g.