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US 12,676,349 B2Granted
Methods for manufacturing positive electrode active material precursor material and positive electrode active material for secondary lithium battery, and positive electrode active material for secondary lithium battery manufactured thereby
AssigneeDongwoo Fine-Chem Co., Ltd.
InventorsMyung-Jin Kim, Ji-Hoon Lee, Bong-Jin Choi
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Abstract
The present invention relates to a method of preparing a precursor material of a positive electrode active material from a waste lithium secondary battery, to a method of preparing a lithium secondary battery positive electrode active material including a precursor material prepared by the same precursor preparation method, and to a lithium secondary battery positive electrode active material prepared by the same positive electrode active material preparation method.
Claims9
A method of preparing a precursor material of a positive electrode material, the method comprising:
- (1) obtaining leachate containing Mn, Ni, and Co by leaching a positive electrode active material of a waste lithium secondary battery;
- (2) obtaining an Mn salt comprising manganese sulfate by performing primary solvent extraction on the leachate with a first phosphoric acid-based material;
- (3) obtaining a Ni salt comprising nickel sulfate by precipitating the raffinate of the primary solvent extraction with an oxime-based material;
- and
- (4) obtaining a Co salt comprising cobalt sulfate by performing secondary solvent extraction on the leachate having undergone the precipitation, with a second phosphoric acid-based material.
2 more elements
Dependencies are inferred from the claim text.