废旧锂离子电池中有价金属的回收(英文)

Recovery of Metal Values From Spent Lithium-ion Batteries

采用超声波分离电极材料-酸浸-钴锂沉淀新工艺分离并回收了废旧锂离子电池中的有价金属。超声波分离中所研究溶剂的分离效果为:NMP>DMF>DMSO丙酮。超声波处理可降低分离温度与时间。采用该工艺,电极材料用NMP于40℃超声波处理15min可完全剥离;所剥离电极材料中99.4%的钴锂可酸浸出;酸浸液中99.5%的钴离子可以高密度球形CoC2O4回收;钴沉淀分离后,滤液中94.5%的锂离子可以Li2CO3沉淀回收。以所回收钴锂化合物制备的LiCoO2具有良好的电化学性能。

A new process involving ultrasonic separation of electrode materials, acid dissolution, precipitation of cobalt and lithium has been applied to recover metals values from spent lithium-ion batteries. The effect of organic solvent on separation of electrode decrease as the order： NMP 〉 DMF 〉 DMSO〉〉Acetone. Ultrasonic treatment can reduce the separation temperature and times. In the optimized process, electrode materials can be separated completely when ultrasonic-treated with NMP at 40℃ for 15min, 99.4% of Co and Li of separated electrode materials can be acid-leached, 99. 5% of cobalt ion in acid solution can be recovered easily as spherical CoC2 O4 powders, and 94. 5% of Li in the surplus filtrate can be recovered as Li2CO3 after the deposition of cobalt. The LiCoO2 , prepared from the recovered compounds of cobalt and lithium, is found to have good elecrtochemical performance.