Li_(1-x)Cr_xFePO_4的微波合成研究  

Study on Synthesis of Li_(1-x)Cr_xFePO_4 by Microwave Processing

作　　者：徐徽[1] 刘卫平[1] 苏元智[1] 石西昌[1] 杨喜云[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《材料导报》2011年第14期150-152,共3页Materials Reports

基　　金：国家科技支撑计划"十一五"重大项目(2008BAB35B04)

摘　　要：采用机械球磨结合微波法合成了Cr3+掺杂锂离子电池正极材料Li1-xCrxFePO4。通过X射线衍射(XRD)、扫描电镜(SEM)和恒电流充放电测试研究了Cr3+掺杂方式和掺杂量对样品的物相结构、形貌和电化学性能的影响。实验结果表明,微波法可以快速合成Li1-xCrxFePO4正极材料;以共沉淀掺杂方式合成的样品Li0.99Cr0.01-FePO4具有最好的电化学性能,在室温下以20mA/g进行充放电测试,其首次放电容量为153.59mAh/g,10次循环之后还有149.29mAh/g,容量保持率为97.20%。The Li1-xCrxFePO4 cathode materials for lithium-ion battery were synthesized by means of mechanical ball-milling and microwave processing. The effects of different ways of Cr^3＋-doping and the amounts of doped-Cr^3＋ on the crystalline structure, morphology of particles and electrochemical properties of the resultant products were investigated by XRD,SEM and constant current charge-discharge test. The experimental results reveal that a Li1-xCrxFePO4 cathode material can be synthesized quickly by microwave processing. And the sample Li0.99 Cr0.01 FePO4 doped by coprecipitation method shows the best electrochemical performance. The initial specific discharge capacity is 153.59mAh/g in tile charge-discharge test （20mA/g） at room temperature and its specific discharge capacity keeps 149.29mAh/g by 97.20% after 10 cycles.

关 键 词：LIFEPO4 正极材料 Cr3+掺杂 微波 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]