退役三元正极材料锂离子电池化学沉淀法回收锂工艺热力学研究

Study on the Thermodynamic Process of Lithium Recovery by Chemical Precipitation of Degraded Ternary Cathode

退役三元正极材料锂离子电池锂资源再利用是减少环境污染、解决锂资源短缺的重要方法之一.从退役三元正极材料锂离子电池湿法处理过程中化学沉淀法回收锂流程出发,研究了LiCl、Li_(2)SO_(4)、LiNO_(3)体系不同沉淀回收锂反应的热力学.结果表明:在热力学角度,磷酸钠对于三种体系均有着适宜的沉淀效果;采用氟化物做沉淀剂时,氟盐要优于氢氟酸用于沉淀反应;相比于其他沉淀剂,碳酸钠用于Li_(2)SO_(4)体系沉锂效果最不好.

The reuse of lithium resources in decommissioned ternary cathode material Li-ion battery is one of the important ways to reduce environmental pollution and solve the shortage of lithium resources.Starting from the process of lithium recovery by chemical precipitation in the wet treatment process of decommissioning ternary anode material Li-ion battery,the thermodynamics of lithium recovery by different precipitation of LiCl,Li_(2)SO_(4)and LiNO_(3)systems were studied.The results show that sodium phosphate has a suitable precipitation effect for the three systems from the perspective of thermodynamics.When fluoride is used as precipitating agent,fluorine salt is better than hydrofluoric acid for precipitating reaction.Compared with other precipitating agents,the effect of sodium carbonate on lithium deposition in Li_(2)SO_(4)system is the worst.