Method of recovering lithium19151537

Abstract

The present disclosure relates to a method of recovering lithium, the method including (i) heat-treating, at 220 to 280° C., (a) a waste cathode comprising a cathode active material layer applied to a current collector, the cathode active material layer including a cathode material having an olivine structure, a binder, and carbon; or (b) cathode active material layer powder obtained by crushing the waste cathode, to recover the cathode material having an olivine structure in powder form; (ii) dissolving the recovered cathode material powder having an olivine structure in an aqueous acetic acid solution to prepare a cathode material solution; (iii) adding an aqueous hydrogen peroxide (H2O2) solution to the cathode material solution and obtaining lithium-dissolved leachate and a leaching residue; (iv) separating the leachate and the leaching residue; and (v) concentrating the leachate, wherein, in step (ii), based on 1 mol of a cathode active material in the recovered cathode material powder, the aqueous acetic acid solution contains 0.8 to 1.2 mol of acetic acid, and in step (iii), based on 1 mol of the cathode active material in the recovered cathode material powder, the aqueous hydrogen peroxide solution contains 0.4 to 0.6 mol of hydrogen peroxide.

Dependencies are inferred from the claim text.