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US 12,258,279 B2Granted
Method for recovering lithium precursor from waste lithium secondary battery positive electrode material
AssigneeSK Innovation Co., Ltd.
InventorsSukjoon Hong, Jiyun Park, Jeongbae Yoon, Seungok Lee, Jimin Kim, Sungreal Son
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Abstract
A method for reducing waste by recovering a lithium precursor including: a) mixing a waste lithium secondary battery positive electrode material with urea to prepare a first mixture; b) firing the first mixture to prepare a second mixture; and c) subjecting the second mixture to water washing to obtain lithium hydroxide.
Claims8
A method for reducing waste by recovering a lithium precursor, the method comprising:
- a) dry mixing a waste lithium secondary battery positive electrode material with urea reducing agent to prepare a first mixture;
- b) firing the first mixture to prepare a second mixture containing lithium hydroxide, wherein the firing is performed solely in an inert atmosphere and the firing temperature ranges from 450° C. to 650° C.;
- and
- c) mixing the second mixture with water to provide an aqueous solution containing a lithium precursor.
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A method for reducing waste by recovering a lithium precursor from a waste lithium secondary battery positive electrode material, the method comprising:
- a) pulverizing the waste lithium secondary battery positive electrode material to produce a pulverized mixture containing lithium;
- b) dry mixing the pulverized mixture with urea reducing agent to produce a first mixture;
- c) firing the first mixture to obtain a preliminary precursor mixture containing the lithium, wherein the firing is performed solely in an inert atmosphere and the firing temperature ranges from 450° C. to 650° C.;
- d) mixing the preliminary precursor mixture with water to produce an aqueous solution containing lithium hydroxide.
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Dependencies are inferred from the claim text.