Recovery of Metal Values From Spent Lithium-ion Batteries

摘要

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°C 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 CoC2O4 powders, and 94.5% of Li in the surplus filtrate can be recovered as Li2CO3 after the deposition of cobalt. The LiCoPO2, prepared from the recovered compounds of cobalt and lithium, is found to have good elecrtochemical performance.