多级结构还原氧化石墨烯包覆的钴铁氧体的合成及电化学性能

Synthesis and Electrochemical Performance of Reduced Graphene Oxide Coated Cobalt Iron Oxide with Hierarchical Structure

以水滑石为前驱体合成微米花/纳米片多级结构过渡金属复合氧化物Co Fe2O4,一种高性能锂离子电池负极材料。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等技术手段对其进行结构表征,发现得到的复合氧化物为单一晶相,且具有多级结构。电化学性能测试表明,得到的负极材料具有高比容量和倍率性能。通过还原氧化石墨烯(r GO)对Co Fe2O4进行表面包覆制备Co Fe2O4/r GO,其循环稳定性得到大幅度提高。

Binary transition metal oxide CoFe2O4 as a high capacity anode material for lithium-ion batteries with the microflower/nanosheet hierarchical structure was synthesized by layered double hydrotalcite-like precursors. The CoFe2O4 and reduced graphene oxide（rGO） coated CoFe2O4 （CoFe2Oa/rGO） materials were characterized by powder X-ray diffraction （XRD）, scanning electron microscope （SEM）, transmission electron microscope （TEM） techniques. The electrochemical performances of the CoFe2O4 and CoFe2Oa/rGO electrodes were examined in terms of cyclic vohammetry and discharge/charge profiles. The electrodes exhibit high capacity and rate capacity. Furthermore, the cyclic performance of CoFe2O4/rGO electrode is better than that of the CoFe2O4 electrode.