三甘醇作碳源合成Li_3V_2(PO_4)_3正极材料  

Synthesis and electrochemical performance of Li_3V_2(PO_4)_3 cathode material via tetraglycol process

作　　者：高峻峰[1] 孟玲菊[1] 孔红红[1] 李小红[1] 陈鸿利[1] GAO Jun-feng;MENG Ling-ju;KONG Hong-hong;LI Xiao-hong;CHEN Hong-li(Department of Chemistry, Hebei Nonnal University for Nationalities, Chengde Hebei 067000, China)

机构地区：[1]河北民族师范学院化学与化工学院,河北承德067000

出　　处：《电源技术》2017年第7期968-970,共3页Chinese Journal of Power Sources

基　　金：河北省科技支撑计划项目(13214408D);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,三甘醇为还原剂,在水相中制备Li_3V_2(PO_4)_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。XRD、SEM和恒电流充放电测试表明,所得的样品为纯相单斜Li_3V_2(PO_4)_3,结晶为10~20 mm的团粒结构;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120.0和114.9 mAh/g,1 C充放电35次循环后放电比容量为112.1 mAh/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 material was synthesized by tetraglycol process.Physical and electrochemical performances of as-prepared materials were characterized through XRD,SEM and galvanostatic charge-discharge test.The results show that products produced by calcining at850℃for8h have a single phase crystal structure.At0.1and1,the initial discharge specific capacities are120.0and114.9mAh/g.After35cycles,the initial discharge specific capacity is112.1mAh/g at1.The capacities efficiency is98%.The synthesized material has a 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]