电化学合成磷酸铁锂正极材料的前驱体  

Electrochemical Synthesis of LiFePO_4 Cathode Materials Precursor

作　　者：邓凌峰[1] 魏银烨[1] 

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《材料导报》2011年第24期54-57,共4页Materials Reports

基　　金：湖南省自然科学基金(09JJ6017);林科大校青年基金

摘　　要：以NH4H2PO4、锂盐和纯铁为主要原料,采用电化学法合成磷酸锂铁前驱体,再通过磷酸锂铁前驱体合成锂离子电池正极材料LiFePO4/C。通过X射线衍射(XRD)、扫描电镜(SEM)及充放电性能测试等方法对其晶体结构、微观形貌和电化学性能进行分析研究。结果表明,LiFePO4/C具有单一的橄榄石型晶体结构。其中在无水乙醇溶剂中合成的LiFePO4/C正极材料粒径细小且分布均匀,具有最好的电化学性能,在0.2C的放电电流下,首次放电比容量达到142.3mAh/g,充放电循环30次后放电比容量仍保持在141.2mAh/g。LiFePO4 precursor was synthesized by electrochemical method using NHI H2PO, lithium salt and pure iron as main raw material, and lithium ion battery positive electrode material LiFeP（/I/C was synthesized by LiFe PO1 precursor. The crystalline structure, morphology and electrochemical performances of LiFePO4/C were investiga ted by X-ray diffraction, scanning electromicroscope,and charge-discharge measurements. The results show that LiFe PO1/C is simple pure phase olivine-type crystal structure. It is noted that the LiFePO,/C composite cathode materials have small and uniform particle sizes, and thus excellent electrochemical performance with the first discharge specific capacity of 142.3mAh/g at the rate of 0. 2C. After 30times cycling,the discharge specific capacity is 141.2mAh/g.

关 键 词：电化学合成 磷酸铁锂 锂离子电池 前驱体 

分 类 号：TM912[电气工程—电力电子与电力传动]