In this work, we recover cobalt from waste 18650-type lithiumion batteries by acid leaching. The cathode material is completely dissolved, after leaching waste batteries by using 10 mol/L industrial sulfuric acid at 70℃ for 1 h. The rate of cobalt leaching is nearly 100%. Removal of sodium carbonate, iron, aluminum and other impurities from the leaching solution was well performed by adjusting the pH to 2-3 with stirring vigorously. Finally, under the conditions of 55℃-60℃ of 240 A/m2 current density, electrodeposition current efficiency was 90.01%, the quality of the electrical output achieved cobalt 1A standard electrolytic cobalt, cobalt until greater than 90% yield. The process is easy and suitable for large-scale lithiumion batteries used in the recovery of valuable metals.
Jin, Y.-J., Mei, G.-J. and Li, S.-Y. (2006) Study on Cobaltous Recovery from Cathode Leachate of Lithium-Ion Battery by Salting Out. Acta Scientiae Circumstantiae, 26, 1122-1125. (In Chinese) Wang, X.-F., Kong, X.-H. and Zhao, Z.-Y. (2001) Rcovery of Metal in Lithium ion Battery. Battery Bimonthly, 31, 14-15. (In Chinese)
Lupi, C., Pasquali, M. and Dell’Era, A. (2005) Nickel and Cobalt Recycling from Lithium-Ion Batteries by Electrochemical Processes. Waste Management, 25, 215-220. http://dx.doi.org/10.1016/j.wasman.2004.12.012
Barbieri, E.M.S., Lima, E.P.C., Lelis, M.F.F., et al. (2014) Recycling of Cobalt from Spent Li-Ion Batteries as β- Co(OH)2 and the Application of Co3O4 as a Pseudocapacitor. Journal of Power Sources, 270, 158-165. http://dx.doi.org/10.1016/j.jpowsour.2014.07.108
Zhao, J.M., Shen, X.Y., Deng, F.L., et al. (2011) Synergistic Extraction and Separation of Valuable Metals from Waste Cathodic Material of Lithium Ion Batteries Using Cyanex272 and PC-88A. Separation and Purification Technology, 78, 345-349. http://dx.doi.org/10.1016/j.seppur.2010.12.024