公开(公告)号：US20250140828A1

公开(公告)日：2025-05-01

申请号：US18834753

申请日：2023-01-16

Applicant: BASF TODA BATTERY MATERIALS LLC

Inventor： Junji KASHIWAGI ,  Kazumichi KOGA ,  Daisuke MORITA

IPC: H01M4/505 ,  H01M4/02 ,  H01M4/04 ,  H01M4/36 ,  H01M4/525 ,  H01M10/052

Abstract: This invention provides a method for treating positive electrode active material particles comprising steps of a lithium-nickel composite is introduced into water and stirred to prepare a slurry; an aluminum-containing solution is dripped onto the slurry while the slurry is stirred; the slurry on which the aluminum-containing solution has been dripped is filtered to obtain a cake-like compound; and the cake-like compound is dried by performing a heat treatment, and a Li—Al hydroxide coating layer is formed on surfaces of secondary particles of the lithium-nickel composite, and at least part of grain boundary portions formed by adjacent primary particles located on the outermost surface, among a plurality of primary particles constituting the secondary particles, and thus possible to restrict any more cracking of particles than necessary and to control the amount of residual lithium, and a deterioration in battery characteristics can be restricted, even with repeated use over long time.