高温固相法再生废旧磷酸铁锂电池正极材料  

Regeneration of Cathode Materials in Spent Lithium Iron Phosphate Batteries by Using High Temperature Solid-Phase Method

作　　者：梁力勃 杨生龙 罗茂枭 赖飞燕 张晓辉 梁冬梅[2] LIANG Li-bo;YANG Sheng-long;LUO Mao-xiao;LAI Fei-yan;ZHANG Xiao-hui;LIANG Dong-mei(Guangxi Hezhou Guidong Electronic Technology Co Ltd,Hezhou 542899,Guangxi,China;College of Materials and Chemical Engineering,Hezhou University,Hezhou 542899,Guangxi,China)

机构地区：[1]广西贺州市桂东电子科技有限责任公司,广西贺州542899 [2]贺州学院材料与化学工程学院,广西贺州542899

出　　处：《矿冶工程》2021年第3期120-123,128,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51964013);贺州市创新驱动发展专项(贺科创ZX1907001);广西科学研究与技术开发计划(桂科AA17202004);广西区级教学改革重点项目(2019JGZ150)。

摘　　要：通过强碱溶液浸泡过程分离废旧磷酸铁锂(LiFePO_(4))电池中的正极材料与铝箔集流体,经过热处理、砂磨混合和高温焙烧实现了(LiFePO_(4))的再生利用。采用XRD、SEM对再生样品的物相和形貌进行表征,结果表明,再生(LiFePO_(4))材料颗粒分布在纳米尺度下,粒径分布均匀,无团聚现象。电化学性能测试结果表明,在0.1C和5C电流密度下,再生(LiFePO_(4))放电比容量分别为165.2和101.5 mAh/g;在1C倍率下循环100次后,材料容量为150.1 mAh/g,保持率为97.85%,表现出较好的倍率和循环性能。该再生工艺简单、合成的材料电化学性能良好,为加快废旧磷酸铁锂电池回收和再生提供了新的借鉴。A spent lithium iron phosphate((LiFePO_(4)))battery was soaked in NaOH solution for the separation between the cathode material and the aluminium foil current collector therein.After a series of processes,including heat treatment,sand milling and mixing,and high temperature roasting,the regeneration of (LiFePO_(4)) was actualized.The phase structure and morphology of the regenerated (LiFePO_(4)) were characterized by X-ray power diffraction and scanning electron microscope.It is found that the generated (LiFePO_(4)) has its nanoscale particles distributed uniformly without agglomeration.The electrochemical test results reveal that the regenerated (LiFePO_(4)) can display a specific discharge capacity of 165.2 and 101.5 mAh/g at 0.1 C and 5 C respectively;it still displays a discharge capacity of 150.1 mAh/g after 100 cycles at 1 C,with a capacity retention of 97.85%,which indicates a good rate preformance and cycling performance.The process is simple and the generated product displays good electrochemical performances,indicating that the research can provide a reference for speeding up recycling and regeneration of spent (LiFePO_(4)) batteries.

关 键 词：废旧电池 正极材料 磷酸铁锂 电池回收 再生利用 锂离子电池 

分 类 号：TM911[电气工程—电力电子与电力传动]