铁源对锂离子电池Li_2FeSiO_4@C正极材料的结构和电化学性能影响  

Influence of the iron source on structure and electrochemical performance of anode material Li_2FeSiO_4@C for lithium ionic battery

作　　者：张庆堂[1] 刘浪浪[1] 闫超[1] 

机构地区：[1]兰州理工大学石油化工学院,兰州730050

出　　处：《化工新型材料》2017年第6期224-226,共3页New Chemical Materials

基　　金：国家自然科学基金项目(21466020)

摘　　要：采用草酸亚铁、柠檬酸铁为铁源通过高温固相法均合成了2种硅酸亚铁锂@碳(Li_2FeSiO_4@C)锂离子电池正极材料(分别标记为LFS-1和LFS-2)。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、恒电流充放电等分析方法,研究铁源对Li_2FeSiO_4@C结构和性能的影响。XRD分析结果表明,LFS-1和LFS-2样品的XRD谱图均发现Fe_3O_4杂质峰,LFS-2样品的杂质峰含量较高。SEM分析得出LFS-2样品的纳米颗粒尺寸较小。电化学测试表明LFS-2样品具有良好的电化学性能。Li_2FeSiO_4@C anode material（desinated as LFS1 and LFS2）were synthesized from ferrous oxalate and ferric citrate by a facile solid-state reaction method,respenctively.Effect of the iron source on structure and performance of Li_2FeSiO_4@C was studied and analyzed by X-ray diffraction（XRD）,scanning electron microscope（SEM）and galvanostatic charge-discharge test,etc.XRD analysis results indicated that LFS-1 and LFS-2 both showed some Fe_3O_4 impurity.LFS-2 samples had higher content of Fe_3O_4 impurity peak.SEM analysis demonstrated that nanoparticles size of LFS-2 samples was smaller.Electrochemical tests manifested that LFS-2 samples showed excellent electrochemical performance.

关 键 词：Li2FeSiO4@C 锂离子电池 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]