摘要
为实现失效磷酸铁锂(LiFePO_(4))电池正极材料的回收和再利用,采用仪器分析和表征方法,研究LiFePO_(4)正极材料失效前、后的理化性质。结果表明:失效后LiFePO_(4)电池正极材料中含有大量的Fe、P、Ni,少量的Cu、Co和微量的F元素,晶相结构未发生明显改变,Fe主要以Fe^(2+)和Fe^(3+)形式存在;LiFePO_(4)电池正极片失效后表面呈现不规则的波浪状缺陷和坑状凹陷;在失效过程中,LiFePO_(4)正极材料颗粒表面产生裂纹,破碎后形成的小颗粒变得黏连、杂乱和团聚,降低正极材料的电化学性能;失效后颗粒表面出现的约20 nm厚的PVDF膜结构影响颗粒表面的疏水性,降低浮选效率。
In order to recover and reuse the cathode material of lithium iron phosphate(LiFePO_(4))battery,physicochemical properties of LiFePO_(4)cathode material before and after failure were studied by instrumental analysis and characterization methods.The results show that the cathode material of LiFePO_(4)battery contains a large amount of Fe,P and Ni,a small amount of Cu and Co,and trace of F.The crystal structure of cathode material does not change significantly,and Fe mainly exists in the form of Fe^(2+)and Fe^(3+).Irregular wavy defects and pit-like depressions appear on the surface of cathode plate of failed LiFePO_(4)battery.During the failure process,cracks occur on the surface of LiFePO_(4)cathode material particles,and the small particles formed after crushing become adhesive,disorderly and agglomerate,which reduce the electrochemical performance of the cathode material.After the failure,the PVDF membrane with a thickness of about 20 nm appears on the particle surface,which affect the hydrophobicity of the particle surface and reduce the flotation efficiency.
作者
李家皓
韦能
李金龙
Sabereh Nazari
何亚群
LI Jiahao;WEI Neng;LI Jinlong;Sabereh Nazari;HE Yaqun(School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China;Hengchuang Ruineng Environmental Protection Technology Co.,Ltd.,Huizhou 516200,China)
出处
《中国粉体技术》
CAS
CSCD
2022年第6期91-98,共8页
China Powder Science and Technology
基金
广东省重点专项研发计划项目,编号:2020B090919003。
关键词
磷酸铁锂电池
正极材料
失效电池
理化性质
lithium iron phosphate battery
cathode material
failed battery
physicochemical properties
作者简介
第一作者:李家皓(1997—),男,硕士研究生,研究方向为矿业工程。E-mail:Ts21040077a31@cumt.edu.cn。;通信作者:何亚群(1963—),男,教授,博士,博士生导师,研究方向为矿物加工工程。E-mail:yqhe@cumt.edu.cn。
