Method for separating nickel, cobalt and manganese from retired power lithium battery positive electrode material

The invention relates to the field of battery material recovery, in particular to a method for separating nickel, cobalt and manganese from a retired power lithium battery positive electrode material.The method comprises the following steps: carrying out overcharge treatment on a positive electrode material obtained by disassembling a retired power lithium battery, separating aluminum foil on thesurface of the positive electrode material, and performing crushing to obtain a positive electrode material; putting the positive electrode material into a hydrogen chloride aqueous solution for leaching, filtering to remove insoluble solid impurities, adding an alkaline regulator into the residual solution to regulate the pH value to be weakly acidic, and filtering again to remove precipitates to obtain a filtrate; and carrying out rotary evaporation and concentration on the filtrate to obtain a concentrated solution, heating the concentrated solution until the solvent is not decomposed to generate gas, further perfo