废旧三元锂电池正极材料的还原酸浸回收与再生  

Recovery and Regeneration of Spent Ternary Lithium Battery Cathode Materials by Reducing Acid Leaching

作　　者：徐子贤 潘波[3] 何玲[1,2] 孙为民 董其铮[1,2] XU Zixian;PAN Bo;HE Ling;SUN Weimin;DONG Qizheng(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Shangrao Vocational Technical College,Shangrao 334109,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学有色金属先进加工与回收国家重点实验室,兰州730050 [3]上饶职业技术学院,江西上饶334109

出　　处：《有色金属工程》2023年第9期64-70,共7页Nonferrous Metals Engineering

基　　金：甘肃省重点研发项目(20YF8WA063)。

摘　　要：采用磷酸为浸出剂,葡萄糖为还原剂,回收三元锂电池正极材料,研究了酸浸过程中磷酸浓度、葡萄糖浓度、固液比、温度、时间对Li、Ni、Co、Mn浸出率的影响。结果表明,最佳浸出工艺参数条件为:磷酸浓度4 mol/L、葡萄糖浓度0.5 mol/L、固液比20 g/L、反应温度80℃、反应时间60 min,在此条件下,Li、Ni、Co、Mn的浸出率可分别达到97.3%、96.54%、96.59%、95.31%。利用未反应收缩核模型拟合了酸浸过程的动力学数据,结果显示浸出过程由表面化学反应所控制。使用共沉淀—固相法再生正极材料,所得材料结晶性良好,元素分布均匀,实现了三元锂电池正极材料的再生。The positive electrode material of ternary lithium batteries was recovered via using phosphoric acid as the leaching agent and glucose as the reducing agent.The effects of phosphoric acid concentration,glucose concentration,solid-liquid ratio,temperature,and time on the leaching rate of Li,Ni,Co,and Mn during the acid leaching process were studied.The results showed that the optimal leaching process parameters were:phosphoric acid concentration 4 mol/L,glucose concentration 0.5 mol/L,solid-liquid ratio 20 g/L,reaction temperature 80℃,and reaction time 60 min.Under these conditions,the leaching rates of Li,Ni,Co,and Mn could reach 97.3%,96.54%,96.59%,and 95.31%,respectively.The kinetic data of the acid leaching process was fitted using the unreacted shrinking core model,and the results showed that the leaching process was controlled by surface chemical reactions.The co precipitation solid phase method was used to regenerate the positive electrode material,resulting in good crystallinity and uniform element distribution,achieving closed-loop regeneration of the positive electrode material for ternary lithium batteries.

关 键 词：废旧锂离子电池 三元正极材料 葡萄糖 磷酸 再生 

分 类 号：TF803.2[冶金工程—有色金属冶金]