基于金属有机骨架材料为前驱物的锂电负极材料α-Fe2O3的合成及性能表征

摘要

采用基于铁离子构筑的金属有机骨架化合物(MIL-53-Fe、MIL-88-Fe、MIL-100-Fe)为模板,通过简单的煅烧处理,制备出三种不同形貌的α-Fe2O3.结果表明当其作为锂离子电池负极材料时,以MIL-53-Fe为前驱物制备的α-Fe2O3具有最优异的电化学性能,当电流为0.1 C时,首次放电容量超过1 100 mA·h/g,在电流为1 C循环100次后,容量保持在245 mA·h/g.%Based on iron organic frameworks(MIL-53-Fe, MIL-88-Fe, MIL-100-Fe) as template, three kinds of porous α-Fe2O3are prepared by a simple calcining treatment in air.When tested as anode material for lithium batteries, the experiment results indicate that the calcined MIL-53-Fe has the best electrochemical performance.When at a rate of 0.1 C, it delivered a exceeded capacity of 1 100 mA·h/g.After 100 cycles at 1 C, comparable capacity of 245 mA·h/g could be achieved.