Chemical and electrochemical recycling of the nickel, cobalt, zinc and manganese from the positives electrodes of spent Ni-MH batteries from mobile phones

► A recycling process was developed for the positive electrodes of Ni-MH batteries. ► Chemical and electrochemical recycling methods for the Ni, Co, Zn and Mn. ► β-Ni(OH)2, Co(OH)2, Zn(OH)2 and Mn3O4 were recycled by chemical precipitation. ► The electrodeposited material contains Ni, Co, CoO, Co(OH)2, and Mn3O4.