Method for recycling and preparing positive electrode material from waste lithium iron phosphate batteries

A method for recycling and preparing a cathode material from waste lithium iron phosphate batteries, comprising:

• (1) discharging the waste lithium iron phosphate batteries, drying an electrolyte inside the waste lithium iron phosphate batteries, then crushing to obtain crushed pieces, and stripping the crushed pieces to obtain a black powder;
• (2) mixing the black powder obtained in step (1) with a benzene sulfonate, and then reacting in a fluidized bed to obtain a black powder with carbon and fluorine being removed;
• (3) adding an acid into the black powder with carbon and fluorine being removed in step (2), performing solid-liquid separation to obtain a solution A and a solid A;
• and then, adding an alkali into the solution A until no precipitation is generated, and performing solid-liquid separation to obtain a solution B and a solid B;
• and
• (4) mixing the solid A and the solution B obtained in step (3), adding at least one of a lithium supplement agent, an iron supplement agent or a phosphate to obtain a mixture, then adding a reducing agent into the mixture, and sintering to obtain the cathode material.