US 12,258,279 B2
Method for recovering lithium precursor from waste lithium secondary battery positive electrode material
Sukjoon Hong, Daejeon (KR); Jiyun Park, Daejeon (KR); Jeongbae Yoon, Daejeon (KR); Seungok Lee, Daejeon (KR); Jimin Kim, Daejeon (KR); and Sungreal Son, Daejeon (KR)
Assigned to SK INNOVATION CO., LTD., Seoul (KR)
Appl. No. 18/255,807
Filed by SK INNOVATION CO., LTD., Seoul (KR)
PCT Filed Nov. 30, 2021, PCT No. PCT/KR2021/017806
§ 371(c)(1), (2) Date Jun. 2, 2023,
PCT Pub. No. WO2022/119262, PCT Pub. Date Jun. 9, 2022.
Claims priority of application No. 10-2020-0166203 (KR), filed on Dec. 2, 2020.
Prior Publication US 2023/0416103 A1, Dec. 28, 2023
Int. Cl. H01M 10/54 (2006.01); C01D 1/30 (2006.01); H01M 6/52 (2006.01); H01M 10/052 (2010.01)
CPC C01D 1/30 (2013.01) [H01M 10/54 (2013.01); H01M 6/52 (2013.01); H01M 10/052 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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.