补锂回收正极材料LiNi0.5Co0.2Mn0.3O2  

Recycle cathode material LiNi0.5Co0.2Mn0.3O2 by supplementing lithium salt

作　　者：梅铭 向黔新 祝巧凤 张晓 MEI Ming;XIANG Qian-xin;ZHU Qiao-feng;ZHANG Xiao(Guizhou Zhenhuci Electro-Chemical Inc,Ltd.,Guiyang,Guizhou 550016,China;Guizhou Zhenhtia Electro-Chemleal Co.,Ltd.,Guiyang,Guizhou 550016,China)

机构地区：[1]贵州振华新材料股份有限公司,贵州贵阳550016 [2]贵州振华新材料有限公司,贵州贵阳550016

出　　处：《电池》2019年第1期86-88,共3页Battery Bimonthly

基　　金：贵阳国家高新技术开发区科技计划项目(GXCX02017-011)

摘　　要：对锂离子电池生产过程中产生的异常LiNi0.5Co0.2Mn0.3O2(NCM523)浆料采用热处理及补锂回收"受浆料中聚偏氟乙烯(PVDF)分解产生的HF的影响,正极材料腐蚀产生锂缺陷(约生成1.77‰以上的LiF及AlF3)。对不同补锂量的回收物料及副反应物用SEM.XRD和电感耦合等离子体原子发射光谱(ICP-AES)进行分析,并使用补锂制备的回收NCM523物料制备全电池,进行高温循环性能研究添加的单水氢氧化锂并经烧结制备的回收NCM523物料,具有较好的高温(60℃)稳定性,在3.0-4.2V以0.7C充电、0.5C放电循环700次,容量保持率在90%以上。The abnormal LiNi0.5Co0.2Mn0.3O2(NCM523) slurry produced in the preparing process of Li-ion battery was heat treated and recycled by supplementing lithium. Since the effect of 11V which produced by decomposition of poly(vinylidene fluoride)(PVDF), the cathode material had lithium defect by corrosion, above 1.77‰ lithium fluoride and aluminum fluoride was collected. The recycled materials with different lithium addition and the by-products were analyzed by SEM, XRD and inductively coupled plasma (ICP). Recycled NCM523 material supplemented lithium was used to prepared full battery, the high-temperature cycle performance was studied. Recycled NCM523 material which supplemented 1‰~3‰ lithium hydroxide monohydrate and after sintering showed fine high temperature cycle stability, when cycled 700 times in 3.0 - 4.2 V at 60℃ with 0.7 C charge and 0.5 C discharge,the capacity retention was above 90 %.

关 键 词：镍钴锰酸锂 锂盐 烧结 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]