喷雾干燥法合成球形LiFePO_4/C材料研究  

Synthesis of spherical LiFePO_4/C by spray drying

作　　者：刘旭恒[1,2] 赵中伟[1] 黄少波[1] 张有新[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《电源技术》2012年第7期937-941,共5页Chinese Journal of Power Sources

基　　金：中南大学博士后基金资助项目;国家重点基础研究发展计划支持项目(2007 CB 613603)

摘　　要：以FePO4.2 H2O、Li2CO3为原料,以葡萄糖为碳源和还原剂,采用喷雾干燥法合成球形LiFePO4/C材料,研究了浆料固含量和进料速率对颗粒大小的影响。X射线衍射(XRD)和扫描电镜(SEM)分析表明:喷雾干燥法合成的LiFePO4/C具有完整的橄榄石型结构,颗粒呈规整的类球状。在室温下测试了LiFePO4/C材料的充放电性能。结果表明,材料具有良好的电化学性能。750℃所得LiFePO4/C材料在0.2 C、0.5 C、1 C和3 C电流密度下的首次放电比容量分别为144.1、139.2、135.5 mAh/g和125.1mAh/g;材料循环性能良好,经10次循环后,材料的放电比容量都保持在99%以上。LiFePO4/C material was synthesized by spray drying using FePO4·2 H2O and Li2CO3 as raw materials and glucose as carbon source and reducing agent. The effects of solid content of slurry and feed rate on particle size were investigated. The results of x-ray diffraction （XRD） and scanning electron microscopy （SEM） analysis show that spherical particles synthesized by spray drying has a complete olivine structure. The electrochemical tests of the charge-discharge process at room temperature show that the cathode material has good electrochemical performance. The LiFePO4/C has an initial discharge specific capacity of 144.1, 139.2, 135.5 mAh/g and 125.1mAh/g at 0.2, 0.5, 1 C and 3 C rate, respectively. The recycling performance of LiFePO4/C is good. The material discharge capacity remains at 99% after 10 cycles.

关 键 词：锂离子电池 LIFEPO4/C 喷雾干燥 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]