US 11,901,528 B2
Method of making a reusable active material by using positive electrode scrap
Min-Seo Kim, Daejeon (KR); Se-Ho Park, Daejeon (KR); and Doo-Kyung Yang, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/792,637
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Jan. 15, 2021, PCT No. PCT/KR2021/000615
§ 371(c)(1), (2) Date Jul. 13, 2022,
PCT Pub. No. WO2022/004981, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 10-2020-0079624 (KR), filed on Jun. 29, 2020.
Prior Publication US 2023/0041348 A1, Feb. 9, 2023
Int. Cl. H01M 10/00 (2006.01); H01M 10/54 (2006.01); C01G 53/00 (2006.01); C22B 7/00 (2006.01); H01M 4/1315 (2010.01)
CPC H01M 10/54 (2013.01) [C01G 53/50 (2013.01); C22B 7/001 (2013.01); H01M 4/1315 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of making a reusable positive electrode active material, comprising:
(a) thermally treating positive electrode scrap comprising a lithium composition transition metal oxide positive electrode 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-1) washing the active material collected from the step (a) with a lithium compound solution which is basic in an aqueous solution;
(b-2) mixing the active material washed from the step (b-1) with a lithium precursor solution and spray drying; and
(c) annealing the active material spray dried from the step (b-2) to obtain a reusable active material.