MFe2O4(M=Co,Zn)中空微球的气泡模板法合成及在锂离子电池中的应用

本文设计并开发了一种气泡模板辅助合成方法，并应用于制备具有中空结构的自组装铁酸盐微球. 采用该方法获得了颗粒尺寸为350nm、颗粒分布均匀的中空微球MFe2O4(M=Co,Zn). 把这两种中空结构材料作为锂电池负极，组装成电池后，在2 Ag-1的电流密度条件下进行充放电测试，发现CoFe2O4的首次放电容量达到1339 mAhg?1，首次充电容量为936 mAhg?1，20次循环后充电容量保持在446 mAhg-1；与之相比，ZnFe2O4的首次放电容量达到1402mAhg?1，首次充电容量为992 mAhg?1，20次循环后充电容量保持在634 mAhg?1. 这两种材料的电化学性能均优于文献报道的同类实心材料的性能，表明自组装中空结构在改善材料锂电性能方面有明显优势.

Bubble Template Synthesis of MFe2O4(M = Co, Zn) Hollow Microspheres and Their Application in Li-ion Batteries

In this work, we designed and developed a bubble template-assisted method to prepare self-assembled ferrite hollow microspheres, by which homogeneously distributed CoFe2O4 (M=Co, Zn) hollow microspheres with the particle sizes of around 350 nm were obtained. The obtained hollow microspheres were assembled into cells and evaluated as negative electrodes of Li-ion battery by galvanostatic charge-discharge technique at a current density of 2 Ag-1. It was found that the first discharge and charge capacities were 1339 mAhg?1 and 936 mAhg?1 for CoFe2O4, and 1402 mAhg?1 and 992 mAhg?1 for ZnFe2O4. After 20 cycles, the charge capacities of CoFe2O4 and ZnFe2O4 remained 446 mAhg?1 and 634 mAhg?1, respectively, which are better than those previously reported. It indicates that self-assembled hollow structures are promising in improving the electrochemical performance for lithium ion battery applications.