锂电池负极材料Fe_3O_4/C多孔纳米片的制备及其电化学性能

Preparation and electrochemical performance of porous Fe_3O_4/C nanosheets as anode materials for lithium-ion batteries

以柠檬酸钠作为表面活性剂调控六方片状铁醇盐(Fe-EG)的生长过程,实现Fe-EG纳米片的厚度可控制备,并将其作为前驱体在N_2条件下450℃热处理3 h,获得多孔超薄Fe_3O_4/C纳米片。利用X线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、拉曼光谱(Raman)、透射电子显微镜(TEM)和红外光谱仪(IR)等分析方法对Fe-EG前驱体和Fe_3O_4/C纳米片进行物相测定和微结构观察,并分析了Fe-EG纳米片的生长机制。结果表明:Fe_3O_4/C纳米片作为锂电池负极材料表现出优异的电化学性能,0.4 A/g电流密度条件下循环100次后高达898.3m A·h/g的放电比容量以及5 A/g条件下518.3 m A·h/g的倍率性能。

The ultrathin porous Fe3O4/C nanosheets were prepared using Na-citrate to mediate the growth of hexagonal Fe-ethylene glycolate（ Fe-EG） nanosheets and annealing the precursors at 450 ℃ in N2.X-ray diffraction（ XRD）,field emission scanning electron microscope（ FESEM）,Raman spectroscopy,transmission electron microscope（ TEM） and infrared spectrometer（ IR） were employed for the phase identification and microstructural observations of the obtained Fe-EG and Fe3O4/C nanosheets and the formation mechanism of Fe-EG was investigated. In particular,the as-prepared Fe3O4/C nanocomposites were shown to possess superior electrochemical performance as anode materials in Li-ion batteries,featured by a reversible capacity of 898. 3 mA·h/g at 0. 4 A/g over 100 cycles and rate capacity of 518. 3mA·h/g at 5 A/g.