Analysis of roasting process of electrode mixture of waste lithium ion batteries
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摘要：
废弃锂离子电池电极材料的分离具有巨大的经济效益和环境效益.采用焙烧工艺分离石墨负极和正极材料(镍钴锰酸锂),使用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)和电子探针显微分析仪(EPMA)对正、负极混合物元素组成、相组成和颗粒元素表面分布进行了表征.结果表明,最佳焙烧温度和时间分别为650℃和2h,而且在不破坏正极材料相组成的前提下,焙烧过程有效去除了负极石墨和电极颗粒表面黏结剂聚偏氟乙烯(polyvinylidene fluoride,PVDF),正极材料得到了有效富集.与原物料相比,焙烧后的物料经研磨后,细粒级含量进一步增加,0.005mm以下物料体积比例达到了16.3%,因此,焙烧是一种有效的预处理方法,可使电极材料颗粒在研磨过程中完全解离,进而使电极材料再利用.
The separation of electrode materials in waste lithium ion batteries would have great economic and environmental benefits.Roasting process was carried out in this study to separate graphite anode and cathode material,namely,nickel cobalt lithium manganate.Its performances on the elemental composition,phase composition and particle element surface distribution were evaluated by X-ray fluorescence spectrometer(XRF),X-ray diffractometer(XRD)and electron probe microanalyzer(EPMA).The results showed that the optimum roasting temperature and time are 650℃and 2 h,respectively,and on the premise of not destroying the phase composition of the cathode material,the graphite anode and polyvinylidene fluoride(PVDF)on the surface of the electrode particles were effectively removed during the roasting process,and the cathode material was effectively enriched.Compared with the raw material,the content of fine particles in the roasted material was further increased after grinding,and the volume percentage of the material below 0.005 mm reached 16.3%.Therefore,the roasting process is an effective pretreatment for full dissociation of electrode material particles in the grinding process and further in the reutilization of electrode materials.
作者：
王帅 周蕊 王震威 王超 谢卫宁
Wang Shuai;Zhou Rui;Wang Zhenwei;Wang Chao;Xie Weining(Advanced Analysis and Computation Center,China University of Mining and Technology,Xuzhou 221116,China)
机构地区：
中国矿业大学现代分析与计算中心
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2021年第3期59-65,共7页
基金：
国家自然科学基金(51904295) 江苏省自然科学基金(BK20180647) 中国矿业大学实验技术研究与开发项目(S2020D003).
关键词：
废弃锂离子电池 焙烧 电极 元素 颗粒
waste lithium ion batteries roasting electrode elements particle
分类号：
X751 [环境科学与工程—环境工程]
