Method For Regenerating Positive Electrode Active Material, Regenerated Positive Electrode Active Material Manufactured Thereby, And Secondary Battery Comprising Same

Abstract: The present invention relates to a method for regenerating a positive electrode active material, a regenerated positive electrode active material manufactured thereby, and a secondary battery comprising same and, more specifically, to a method for regenerating a positive electrode active material, a regenerated positive electrode active material manufactured thereby, and a secondary battery comprising same, wherein the method comprises the steps of: (a) pulverizing a waste positive electrode including a current collector and a positive electrode active material layer coated thereon with a pin mill under dry conditions to obtain the positive electrode active material layer as a powder; (b) heat-treating the positive electrode active material layer powder at 460-530? in the air to recover the positive electrode active material; (c) adding a lithium precursor to the recovered positive electrode active material and annealing at 400-1000?; and (d) washing the annealed positive electrode active material with a washing solution. The method for regenerating a positive electrode active material according to the present invention has the advantages that: the binder and the conductive material can be easily removed even at a lower heat treatment temperature than the prior art; damage to the positive electrode active material due to washing can be minimized; the loss of lithium in the positive electrode active material is reduced to restore the crystalline structure with a small amount of a lithium precursor, along with the recovery of a positive electrode active material superior in battery characteristics; no acids are used for the recovery and regeneration processes, which is eco-friendly and reduces process costs because of no requirement for the neuralization and waste water treatment in response thereto; no metal elements are discarded by regenerating the positive electrode active material as it is without decomposing the positive electrode active material; and there is no risk of toxic gas generation or explosion because no organic solvents are used.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents