草酸协助合成改进磷酸锰锂的性能  

Improving the performance of lithium manganese phosphate by oxalic acid-assisted synthesis

作　　者：易惠华[1,2] 胡成林[1,2] 

机构地区：[1]湖北理工学院化学与材料工程学院,湖北黄石435003 [2]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《电池》2013年第6期337-339,共3页Battery Bimonthly

基　　金：湖北省教育厅基金(Q20134403);湖北理工学院科技创新团队项目(13xtz09);湖北理工学院引进人才项目(13xjz02R;13xjz03R)

摘　　要：通过草酸（OA）协助，采用固相反应方法合成了碳包覆磷酸锰锂（LiMnPO4）材料。用XRD、场发射扫描电镜（FE—SEM）和充放电测试对样品进行分析。添加草酸可抑制颗粒生长和杂质生成，提高LiMnPO4的电化学活性。添加草酸的样品电极极化更轻，循环性能和倍率性能更稳定，放电比容量比未使用草酸的样品提高20～63mAh／g。Carbon coated lithium manganese phosphate （LiMnPO4）material was synthesized by solid-state reaction method with oxalic acid（OA） assisting. The sample was analyzed by XRD,field emission scanning electron microscopy（FE-SEM） and charge/ discharge tests. The addition of OA could suppress the growth of particle and the formation of impurity, enhance the electrochemical activity of LiMnPO4. The sample added OA had less polarization and more stable cycle performance and high rate performance. Its specific discharge capacity was 20 - 63 mAh/g higher than the sample without added OA.

关 键 词：锂离子电池 磷酸锰锂(LiMnPO4) 草酸(OA) 碳包覆 极化 

分 类 号：TM912.9[电气工程—电力电子与电力传动]