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

摘要

设计并开发了一种气泡模板辅助合成方法,并将其用于制备具有中空结构的自组装铁酸盐微球.获得r颗粒尺寸为350 nm,颗粒分布均匀的中空微球MFe2O4(M=Co,zn).将2种中空结构材料作为锂电池负极,组装成电池后,在2 A/g的电流密度下进行充放电测试,发现CoFe2O4的首次充电、放电容量分别达到761和1057 mA·h/g,20次循环后充电容最保持在262 mA·h/g;相比之下,znFe204的首次充电、放电容量分别达到817和1120 mA·h/g,20次循环后充电容量保持在450 mA·h/g.%We designed and developed a bubble template-assisted method to prepare self-assembled ferrite hollow microspheres, by which homogeneously distributed CoFe2 O4 ( 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 A/g. It was found that the first discharge and charge capacities were 1057 and 761 mA · h/g for CoFe2O4, and 1120 and 817 mA · h/g for ZnFe204. After 20 cycles, the charge capacities of CoFe204 and ZnFe2O4 remained 262 and 450 mA · h/g, respectively.