Methods for preparing cathode active material precursor material and cathode active material for lithium secondary battery, and cathode active material for lithium secondary battery prepared according to same
AssigneeDongwoo Fine-Chem Co., Ltd.
InventorsMyung-Jin Kim, Ji-Hoon Lee, Bong-Jin Choi
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Abstract
The present disclosure provides: a method for preparing a cathode active material precursor material by using a high-nickel-content waste lithium secondary battery; a method for preparing a cathode active material for a lithium secondary battery, including a cathode active material precursor material prepared by the method for preparing a cathode active material precursor material; and a cathode active material for a lithium secondary battery, prepared according to the method for preparing a cathode active material for a lithium secondary battery.
Claims9
A method for preparing a cathode active material precursor material using a waste lithium secondary battery, the method comprising:
- (1) leaching a cathode active material of the waste lithium secondary battery to obtain a leachate;
- and
- (2) mixing a polar solvent and an alkaline solution and then dissolving an oxime-based material to form a saponified oxime-based material that is saponified to 50% or more;
- and
- (3)precipitating nickel by adding 2 to 20 w/v % of a saponified oxime-based material to the leachate.
Dependencies are inferred from the claim text.