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H₂O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, H₂O/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.

邵佳文(1998-),女,硕士,工程师,研究方向为废旧锂离子电池资源化利用,13020713229@163.com