US 12,218,323 B2
Method for reusing active material using positive electrode scrap
Se-Ho Park, Daejeon (KR); Min-Seo Kim, Daejeon (KR); Doo-Kyung Yang, Daejeon (KR); and Myung-Hwan Kim, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/788,705
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Nov. 6, 2020, PCT No. PCT/KR2020/015556
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/241819, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 10-2020-0062372 (KR), filed on May 25, 2020.
Prior Publication US 2023/0045467 A1, Feb. 9, 2023
Int. Cl. H01M 10/54 (2006.01); C01G 51/00 (2006.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/54 (2013.01) [C01G 51/42 (2013.01); H01M 4/525 (2013.01); C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2006/40 (2013.01); C01P 2006/80 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for producing a reusable positive electrode active material, comprising:
(a) thermally treating positive electrode scrap comprising an active material layer on a current collector in air for thermal decomposition of a binder and a conductive material in the active material layer, to separate the current collector from the active material layer, and collecting an active material in the active material layer;
(b) washing the active material collected from the step (a) for 1 hour or less using a lithium precursor aqueous solution which is basic in an aqueous solution and drying; and
(c) annealing the washed active material without adding an additional lithium precursor to obtain a reusable active material,
wherein the thermal treatment is performed at 300 to 650° C. for 1 hour or less.