LiFePO_4/C正极材料的微波合成及性能研究  

Study on Microwave Synthesis and Properties of LiFePO_4/C Cathode Materials

作　　者：徐徽[1] 刘卫平[1] 苏元智[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12期148-150,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辐射工艺合成C包覆锂离子电池正极材料LiFePO4/C。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不同C源和掺C量对样品物相结构、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LiFePO4/C正极材料;以乙炔黑作为C源,掺杂8%(质量分数)所合成的样品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148.44mAh/g,10次循环后仍有144.74mAh/g,容量保持率为97.51%。The LiFePO4/C cathode materials for lithium-ion battery were synthesized by means of mechanical ball-milling and microwave processing. The effects of different C-suppliers and the amounts of C-coating on the crystalline structure, morphology of particles and electrochemical properties of the resultant products were investigated by X-ray diffraction, scanning electro-microscopy and constant current charge-discharge test. The experimental results reveal that LiFePO4/C cathode material can be synthesized quickly by microwave processing. And the sample synthesized with 8wt% acetylene black shows the best electrochemical performance. The intial specific discharge capacity is 148. 44mAh/g achieved in the charge-discharge test（20mA/g） at room temperature and its specific discharge capacity keeps 144. 74mAh/g by 97. 51% after 10 times cycling.

关 键 词：LIFEPO4/C 正极材料 C包覆 微波合成 锂离子电池 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]