Li_3V_2(PO_4)_3/C复合正极材料的合成及电化学性能  

Synthesis and Electrochemical Properties of Li_3V_2(PO_4)_3/C

作　　者：刘民忠[1] 郭学益[1] 

机构地区：[1]中南大学冶金科学工程学院,长沙410083

出　　处：《微细加工技术》2008年第3期35-39,共5页Microfabrication Technology

摘　　要：通过碳热还原法合成了锂离子电池正极材料Li3V2(PO4)3,研究了球磨和碳含量对Li3V2(PO4)3的合成和电化学性能的影响。利用XRD、SEM和电化学测试对Li3V2(PO4)3进行研究表明,经过球磨合成的样品XRD晶面衍射峰的强度增强,样品颗粒均匀细化;样品中随着碳含量的增加,其XRD晶面衍射峰的强度减弱,样品颗粒趋于细化;经过球磨4 h,且原料中碳过量30%合成的Li3V2(PO4)3样品的首次放电容量为117 mAh/g,常温下循环30次后容量为105 mAh/g,在55℃高温下循环30次后容量103 mAh/g。The cathode material Li3V2 （PO4）3 for lithium batteries was prepared by a carbon-thermal reduction （CTR） process, effect of ball milling and carbon contents on the synthesis and electrochemical properties of Li3V2（PO4）3 was studied. The property of the Li3V2（PO4）3 was investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical measurement. The results show that ball milling can make the intensity of diffraction apices of the sample increases and particle size becomes smaller together with homogenous distribution. The intensity of diffraction apices decreases and particle size becomes smaller with the increase of carbon contents. The initial discharge specific capacity of Li3V2（PO4）3 samples was 117 mAh/g, after 50 cycles the capacity retains 105 mAh/g, 103 mAh/g at room temperature and at 55 ℃,respectively.

关 键 词：锂离子电池 正极材料 LI3V2(PO4)3 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]