中文摘要：

采用离子液体1-丁基-3-甲基咪唑双（三氟甲烷磺酰）亚胺盐（[Bmim][TFSI]）辅助合成了Fe3O4纳米粒子，研究了其磁、电化学方面的性能，并利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）等对样品进行了表征。实验结果表明：以该离子液体为稳定剂合成的Fe3O4纳米粒子平均直径约为20nm，且形貌均一，在室温下表现出超顺磁性，饱和磁化强度为68．13emu／g。将所得Fe3O4纳米粒子应用于锂离子电池负极材料，在电流密度为0．1A／g条件下，首次充放电比容量分别高达1025mAh／g和1428mAh／g。

英文摘要：

Fe304 nanoparticles were synthesized using ionic liquid 1-butyl-3-methyl imidazolium bis （trifluoromethane sulfonyl ） imide （ [ Bmim ] [ TFSI ] ） as a stabilizer. The magnetic and electrochemical performances of as-synthesized Fe304 nanoparticles were studied. The structure and morphology of as- synthesized Fe304 nanoparticles were characterized by X-ray diffraction （XRD） and scanning electron microscopy（SEM）. The results show that the morphology of products is uniform and the average particle size of the synthesized nanoparticles is found to be 20 nm. The as-synthesized Fe304 nanoparticles exhibit superparamagnetic behavior with saturation magnetization of 68.13 emu/g at room temperature. Additionally, galvanostatic chare and discharge were tested with the Fe3O4 nanoparticles as anode of materials lithium ion batteries at the current density of 0. 1 A/g. The first charge and discharge capacities of the Fe304 nanoparticles are 1025 mAh/g and 1428 mAh/g, respectively.