| 英文摘要 |
At present there was only one battery recovery factory in Taiwan which reclaimed mercury from manganese batteries and alkaline zinc-manganese dioxide batteries. The spent lithium-ion batteries are all exported outside the border. When chemical precipitation method was employed to recovery metals from the new type of NCM (Nickel, Cobalt, Manganese) lithium-ion batteries the three metals co-precipitated and produced a low value material. The first-year project of this research studied the best parameters of reclaiming technology employed to recovery the anodic materials from spent lithium-ion battery. These parameters included types of leaching solution, extraction solvent, concentration of stripping solution, solution pH, bath temperature and operation time. The project had accomplished analysis of the composition of NCM (LiNiO2/LiCoO2/LiMn2O4) and lithium cobalt oxide batteries. The best acid solution for dissolution of anodic materials (NCM and lithium cobalt oxide) was a mixture of H2SO4 and H2O2. Two extraction stages were used to separate Manganese, Cobalt and Nickel, respectively. Acid leaching liquor of anodic material was extracted by solvent and separated into Mn extracting oil phase and Co/Ni raffinate solution. The Co/Ni raffinate solution was extracted by another solvent and separated into Co extracting oil phase and Ni raffinate solution. Mn extracting oil phase and Co extracting oil phase were respectively stripping by acid solution. The final electrowinning films of cobalt prepared by different anodic materials and different recovery processes revealed the extraction process improved the purity and value of the recovered cobalt.
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