Yang Xuan, Zhang Yingjie, Meng Qi, Dong Peng, Ning Peichao, Li Qingxiang
Faculty of Materials Science and Engineering, Kunming University of Science and Technology Kunming 650093 China.
National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Battery Materials of Yunnan Province, Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology Kunming 650093 China
RSC Adv. 2020 Dec 23;11(1):268-277. doi: 10.1039/d0ra09297e. eCollection 2020 Dec 21.
The novel strategy of multi-step directional precipitation is proposed for recovering valuable metals from the leachate of cathode material obtained by mechanical disassembly from mixed spent lithium-ion batteries. Based on thermodynamics and directional precipitation, Mn is selectively precipitated under conditions of MRNM (molar ratio of (NH)SO to Mn) = 3, pH = 5.5 and 80 °C for 90 min. Ni was then selectively precipitated using CHNO under conditions of pH = 6, MRCN (molar ratio of CHNO to Ni) = 2, 30 °C and 20 min. Then, the pH was adjusted to 10 to precipitate Co as Co(OH). Finally, Li was recovered by NaCO at 90 °C. The precipitation rates of Mn, Ni, Co, and Li reached 99.5%, 99.6%, 99.2% and 90%, respectively. The precipitation products with high purity can be used as raw materials for industrial production based on characterization. The economical and efficient recovery process can be applied in industrialized large-scale recycling of spent lithium-ion batteries.
提出了一种多步定向沉淀的新策略，用于从通过机械拆解混合废旧锂离子电池获得的正极材料浸出液中回收有价金属。基于热力学和定向沉淀原理，在(NH)SO与Mn的摩尔比（MRNM）=3、pH=5.5、80℃下反应90分钟的条件下，Mn被选择性沉淀。然后，在pH=6、CHNO与Ni的摩尔比（MRCN）=2、30℃下反应20分钟的条件下，使用CHNO选择性沉淀Ni。接着，将pH值调至10，使Co以Co(OH)的形式沉淀。最后，在90℃下用NaCO回收Li。Mn、Ni、Co和Li的沉淀率分别达到99.5%、99.6%、99.2%和90%。经表征，高纯度的沉淀产物可作为工业生产的原料。该经济高效的回收工艺可应用于废旧锂离子电池的工业化大规模回收。
