离子液体热合成法制备钒酸铁及其电化学性能  

Ionothermal synthesis and electrochemical performance of ferric vanadate

作　　者：赵鹬[1] 李忠英 雷福红 张宇婷 李世友[1] ZHAO Yu;LI Zhongying;LEI Fuhong;ZHANG Yuting;LI Shiyou(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《精细化工》2024年第6期1354-1361,共8页Fine Chemicals

基　　金：国家自然科学基金项目(21763016)。

摘　　要：以离子液体1-丁基-3-甲基咪唑酸溴盐([Bmim]Br)为反应溶剂,采用离子液体热合成法制备了钒酸铁前驱体,通过煅烧和后处理成功地合成了粒径均一、排布密集的FeVO_(4)纳米颗粒。采用SEM、XRD、XPS、TEM、N_(2)吸附-脱附对材料的结构和形貌进行了表征。以FeVO_(4)纳米颗粒为负极材料构建了锂离子电池,采用恒流充电放电测试、循环伏安法(CV)和电化学阻抗对电池进行了电化学性能评价。结果表明,Fe VO_(4)电极作为锂离子电池负极材料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300 mA/g电流密度下的初始放电比容量为1471.58 mA·h/g,在300 mA/g下循环100次后,仍获得783.00 mA·h/g的高比容量,其优异的电化学性能可能归因于电极材料的纳米级尺寸。FeVO_(4)nanoparticles with uniform particle size were successfully synthesized from calcination and post-treatment of the ferric vanadaten precursor,which was prepared by ionothermal synthesis method using ionic liquid 1-butyl-3-methylimidazolium bromide([Bmim]Br)as reaction solvent.The structure and morphology of the obtained samples were then characterized by SEM,XRD,XPS,TEM and N_(2)adsorption-desorption.The FeVO_(4)nanoparticles were further used as anode material to construct lithium-ion batteries,and the electrochemical performance of the battery was evaluated by constant current charging and discharging test,cyclic voltammetry(CV)and electrochemical impedance.The results showed that the FeVO_(4)electrode showed excellent cycling and electrochemical performance at high current density,with an initial discharge capacity of 1471.58 mA·h/g at 300 mA/g.After 100 cycles at 300 mA/g,a high specific capacity of 783.00 mA·h/g was obtained.This excellent electrochemical performance might be attributed to the nanoscale size of the electrode material.

关 键 词：钒酸铁 离子液体热合成法 锂离子电池 负极材料 有机电化学 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程] TQ138.11[化学工程—无机化工]