US 11,769,880 B2
Method of mixing cathode active material
Sang Mok Park, Gwangju-si (KR); Seung Min Oh, Incheon (KR); Woo Young Jin, Busan (KR); Ji Eun Lee, Hwaseong-si (KR); Sang Hun Lee, Paju-si (KR); Ko Eun Kim, Cheongju-si (KR); Jun Ki Rhee, Suwon-si (KR); and Yoon Sung Lee, Suwon-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed on Aug. 27, 2021, as Appl. No. 17/460,036.
Claims priority of application No. 10-2020-0151290 (KR), filed on Nov. 12, 2020.
Prior Publication US 2022/0149374 A1, May 12, 2022
Int. Cl. H01M 4/60 (2006.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 4/04 (2006.01)
CPC H01M 4/60 (2013.01) [H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 4/621 (2013.01); H01M 4/624 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of mixing a cathode active material in a process of manufacturing a cathode of a lithium secondary battery, comprising:
a preparation step of preparing a lithium compound removal solution in which PAA (polyacrylic acid) is mixed with a solvent, wherein in the preparation step, the lithium compound is LiOH;
a removal step of reacting the lithium compound removal solution with the cathode active material, on a surface of which the lithium compound is present, thus removing the lithium compound present on the surface of the cathode active material;
a mixing step of mixing the cathode active material, which is mixed with the lithium compound removal solution, with a conductive material and a binder; and
between the removal step and the mixing step, a reaction maintenance step of maintaining a reaction for 20 minutes or more so that the LiOH present in the cathode active material is reacted with the PAA to generate Li-PAA.