非溶剂水添加对溶剂剥离正极材料与集流体的影响  

Effect of adding non-solvent water on separation of cathode material and current collector

作　　者：邵佳文 阮丁山 周游 李强 陈嵩 胡俊杰 SHAO Jia-wen;RUAN Ding-shan;ZHOU You;LI Qiang;CHEN Song;HU Jun-jie(Guangdong Brunp Recycling Technology Co.,Ltd.,Foshan 528100,China;Guangdong Provincial Key Laboratory of Battery Recycling,Foshan 528100,China)

机构地区：[1]广东邦普循环科技有限公司,广东佛山528100 [2]广东省电池循环利用企业重点实验室,广东佛山528100

出　　处：《现代化工》2023年第9期172-175,共4页Modern Chemical Industry

基　　金：广东省电池循环利用企业重点实验室项目(2021B1212050002)。

摘　　要：通过聚偏氟乙烯(PVDF)在不同体系中的溶解性差异对其进行溶解与去除,从而剥离废锂电池正极极片的活性物质与铝箔集流体。通过调控N-甲基吡咯烷酮(NMP)溶剂中H_(2)O的质量分数来溶解和去除有机粘结剂PVDF,考察了非溶剂水添加对电池极片剥离效果的影响。结果表明,非溶剂水添加质量分数为0~5%、温度为80℃、超声处理60 min、固液比为1∶5、搅拌速率为600 r/min的条件下,极片剥离效果较好,最佳剥离率为99.62%。在此基础上进行了PVDF的析出去除及NMP循环回用可行性探究。对比传统溶剂溶解法,非溶剂水的添加具有环保性、经济性的优点。Polyvinylidene fluoride(PVDF)is dissolved and removed by utilizing its different solubility in different systems,therefore separating the active substances and aluminum foil collector on cathode pole pieces of spent lithium battery.Firstly,H_(2)O/NMP system is used as the co-solvent to dissolve and remove PVDF,an organic binder in cathode poly pieces,and the effect of the addition of non-solvent water on the separating effect of the battery electrode pole pieces is investigated.The optimal conditions for the separation are obtained as follows:the addition amount of non-solvent water is 0%-5%,the temperature is 80℃,ultrasonic cleaning time is 60 min,the solid-liquid ratio is 1:5,and the stirring speed is 600 r·min^(-1).Under the optimal conditions,the separating rate reaches 99.62%.On this basis,the feasibility is performed on removing PVDF and recycling NMP.Compared with the traditional solvent dissolution method,the addition of non-solvent water has advantages in environmental protection and economic growth.

关 键 词：非溶剂水添加剂 有机粘结剂PVDF 极片剥离 锂电池回收 

分 类 号：X705[环境科学与工程—环境工程]