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 lit...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 ℃ 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∶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 ℃ 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.展开更多
基金Project(20051D0500403) supported by the Cultivation of Excellent Talents Program of Beijing Municipal Ministry of Organization, China
文摘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 ℃ 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∶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 ℃ 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.
