磷化渣制备多元掺杂LiFePO_4/C正极材料的研究  

Research of multi-doped LiFePO_4/C cathode materials preparation with phosphating sludge

作　　者：刘肖强 张素娜[1] 吴敏昌[2] 乔永民[2] 王利军[1] 

机构地区：[1]上海第二工业大学环境与材料工程学院,上海201209 [2]上海杉杉科技有限公司,上海201209

出　　处：《电源技术》2017年第10期1392-1395,共4页Chinese Journal of Power Sources

基　　金：浦东新区科技发展基金创新资金(PKJ2014-Z03);上海第二工业大学校基金(A01GY16GX02)

摘　　要：采用水热酸洗法对磷化渣进行提纯,以得到的含有微量Zn、Ca等元素的FePO_4为原料,利用碳热还原法制备多元掺杂LiFePO_4/C正极材料。利用X射线荧光光谱仪(EDX)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电化学工作站及恒流充放电仪对材料的组分、晶体结构、形貌及电化学性能进行了分析和表征。结果表明:磷化渣提纯后得到的FePO_4纯度较高;合成的LiFePO_4/C正极材料晶体结构为橄榄石型,其首次放电比容量为146.28 mAh/g,首次库仑效率为94.05%,同时表现出较好的倍率和循环性能。A hydrothermal acid pickling method was employed to purify phosphating sludge,multi-doped LiFePO4/C cathode materials were synthesized by carbothermal reduction method,using the FePO4which contained trance Zn,Ca and other elements as raw material.The component,crystal structure,morphology,electrochemical performance of the material were analyzed and characterized by EDX,XRD,SEM,electrochemical working station and constant current charge-discharge instrument.The results show that the purity of FePO4 which comes from puried phosphating sludge is higher.The crystal structure of the synthesized LiFePO4/C cathode material was olivine type,its initial discharge capacity was 146.28 mAh/g and its initial coulomb efficiency was 94.05%.At the same time,this material shows better rate and cycle performance.

关 键 词：磷化渣 水热酸洗法 磷酸铁锂 多元掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]