离子液体热合成法制备钒酸铁材料及其电化学性能研究

Ionothermal synthesis of iron vanadate for the electrochemical application

摘要:

以离子液体溴化-1-丁基-3-甲基咪唑酸盐[Bmim]Br作为反应溶剂和模板剂，采用离子液体热合成法获得前驱体FeVO4·1.1H2O纳米棒，通过焙烧和后处理成功地合成了FeVO4纳米微球，并将其用于锂离子电池负极材料。通过XRD、XPS、BET等表征技术研究制备样品的结构和形态。FeVO4电极在高电流密度下表现出优异的循环性能和电化学性能，其在100 mA g-1下具有1471.58 mAh g-1的初始放电容量，并且在300 mA g-1下100次循环后保持了783 mAh g-1的比容量。该优异的电化学性能可能归因于电极材料的纳米级尺寸和独特的球形状态。

Abstract:

A precursor FeVO4·1.1H2O nanorod was obtained through the ionothermal synthesis method with the ionic liquid bromide-1-butyl-3-methylimidazolate [Bmim]Br as the reaction solvent, and then the FeVO4 nano-microsphere was successfully synthesized by calcination and post-treatment of the precursor FeVO4·1.1H2O, which was used as the cathode material for the lithium ion battery. Structure and morphology properties of samples prepared were characterized through XRD, XPS and BET methods. The FeVO4 electrode showed an initial discharge capacity of 1471.58 mAh g-1 at 100 mA g-1, and maintained the specific capacity of 783 mAh g-1 after 100 cycles at 300 mA g-1. Besides the nanoscale size of the electrodes, the improved rate performance is mainly attributed to the unique spherical state.