Preparation of LiNi1/3Co1/3Mn1/3O2 cathode materials from spent Li-ion batteries

摘要

A recycling process including separation of electrode materials by ultrasonic treatment,acid leaching,Fe-removing,precipitation of cobalt,nickel,manganese and lithium has been applied successfully to recycle spent lithium-ion batteries and to synthesize LiNi1/3Co1/3Mn1/3O2.When ultrasonic treatment with 2-nitroso-4-methylphenol(NMP) at 40 °C for 15 min,the electrode materials are separated completely.Above 99% of Co,Ni,Mn and Li,95% of Fe in the separated electrodes are acid-leached in the optimized conditions of 2 mol/L H2SO4,1.2 H2O2.H2SO4 (molar ratio),70 ,1 °C .10 initial S.L ratio,and 1 h.99.5% of Fe and less than 1% of Co,Ni,Mn in the leaching solution can be removed in the conditions of initial pH value 2.0.2.5 adjusted by adding 18% Na2CO3,90 °C and stirring time 3 h.After adjusted to be equal by adding NiSO4,CoSO4 and MnSO4 solution,97.1% of Ni,Co,Mn in the Fe-removing surplus leaching solution can be recovered as Ni1/3Co1/3Mn1/3(OH)2.94.5% of Li in the surplus filtrate after the deposition of Co,Ni and Mn can be recovered as Li2CO3.The LiNi1/3Co1/3Mn1/3O2,prepared from the recovered compounds,is found to have good characteristics of the layered structure and elecrtochemical performance.