Shen Lisha, Song Huawei, Yang Gongzheng, Wang Chengxin
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11063-8. doi: 10.1021/acsami.5b01452. Epub 2015 May 19.
The intrinsic electronic conductivity can be improved by doping efficiently. CoxFe3-xO4 nanostructures have been synthesized for the first time to improve the conductivity of lithium battery electrode. The solid solution CoxFe3--xO4 were characterized by X-ray diffraction pattern (XRD), Raman spectrum, scanning electron microscopy (SEM), transmission electron microscope (TEM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The results show that the doping enlarge the lattice spacing but the structure of Co3O4 is stable in the Li-ion intercalation/deintercalation process. The AC impedance spectrum reveals the conductivity is well improved. In addition, the solid solution CoxFe3-xO4 exhibit excellent electrochemical characteristics. The electrodes with 20% molar ratio of Fe ions own a reversible capacity of 650.2 mA h g(-1) at a current density of 1 A g(-1) after 100 cycles.
通过有效掺杂可提高本征电子导电性。首次合成了CoxFe3-xO4纳米结构以提高锂电池电极的导电性。采用X射线衍射图谱（XRD）、拉曼光谱、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、电化学阻抗谱（EIS）和循环伏安法（CV）对固溶体CoxFe3-xO4进行了表征。结果表明，掺杂增大了晶格间距，但Co3O4的结构在锂离子嵌入/脱嵌过程中是稳定的。交流阻抗谱表明导电性得到了很好的改善。此外，固溶体CoxFe3-xO4表现出优异的电化学特性。在1 A g(-1)的电流密度下循环100次后，铁离子摩尔比为20%的电极具有650.2 mA h g(-1)的可逆容量。
