四甘醇作碳源合成Li_3V_2(PO_4)_3正极材料及其电化学性能  

Synthesis and electrochemical performance of Li_3V_2(PO_4)_3 cathode material with tetraglycol as carbon source

作　　者：高峻峰[1] 孟玲菊[1] 张圣洁[1] 卢宇轩 陈鸿利[1] 

机构地区：[1]河北民族师范学院,河北承德067000

出　　处：《电源技术》2016年第9期1765-1767,共3页Chinese Journal of Power Sources

基　　金：承德市财政局资助项目(CZ2012003)

摘　　要：以LiOH·H_2O、NH_4VO_3、H_3PO_4为原料,四甘醇为还原剂,在水相中制备Li_3V_2（PO4）_3前驱体,在惰性气氛中850℃焙烧8 h得到锂电池正极材料Li_3V_2（PO_4）_3。X射线衍射光谱法（XRD）、扫描电子显微镜法（SEM）和恒电流充放电测试表明,所得样品为单斜Li_3V2（PO4）_3,厚度约为0.5μm的片状结晶;在3.0~4.3 V（vs.Li/Li＋）电压范围内以0.1 C、1 C充放电,首次放电比容量分别为123.1和113.5 m Ah/g,1 C充放电40次循环后放电比容量为111.1 m Ah/g,容量保持率为98%,具有良好的倍率性能和循环性能。Lithium vanadium phosphate cathode materials were synthesized by tetraglycol reduction process. The physical and electrochemical performance of the prepared materials were characterized through XRD, SEM and galvanostatic charge-discharge test. The results show that products calcined at 850 ℃ for 8 h have monoclinic crystal structure. At 0.1 C and 1 C, the initial discharge specific capacities are 123.1 and 113.5 mAh/g. After 40 cycles, the discharge specific capacity is 111.1 mAh/g at 1 C. The capacity retention is 98%. The synthesized material has good rate and cycling performance.

关 键 词：LI3V2(PO4)3 四甘醇 锂离子电池 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]