FeSb2纳米棒的溶剂热合成与电化学脱嵌锂性能

用溶剂热法合成了作为一种新型锂离子电池负极材料的FeSb2纳米棒. 高分辨透射电镜(HRTEM)观察表明, FeSb2纳米棒的直径为20～40 nm, 长度为0.2～1.0 μm. 恒流充放电测试和循环伏安测试显示, FeSb2纳米棒首次可逆容量达到543 mAh?g?1, 经过10次循环后, 可逆容量保持在353 mAh?g?1. 虽然首次库仑效率仅为64%, 但仍明显优于FeSb2纳米颗粒, 并在10次循环后基本稳定在90%. FeSb2纳米棒在循环过程中仍可能发生粉化和破裂, 导致电极逐渐失效.

Solvothermal Synthesis and Electrochemical Lithiation/Delithiation Performance of FeSb2 Nanorods

FeSb2 nanorods, as a potential anode material for lithium-ion batteries, were prepared by solvothermal method in the present work. High-resolution transmission electron microscopy (HRTEM) observations show that the FeSb2 nanorods are 20～40 nm in diameter and 0.2～1.0 μm in length. The charge-discharge measurements and cyclic voltammetry tests reveal that the FeSb2 nanorods exhibit the high initial reversible capacity of 543 mAh?g?1 and an approving cycling stability with 353 mAh?g?1 after 10 cycles. Although the initial coulomb efficiency of the FeSb2 nanorods is only 64%, it is better than that of FeSb2 nano-particles and maintains at 90% after 10 cycles. However, the FeSb2 nanorods could be pulverized and cracked during the cyclic voltammetry test resulting in the failure of the electrode.