公开(公告)号：US20250149558A1

公开(公告)日：2025-05-08

申请号：US18940619

申请日：2024-11-07

Applicant: Samsung SDI Co., Ltd.

Inventor： Aram CHOI ,  Dongwook SHIN ,  Soonkie HONG ,  Seungyeon CHOI ,  Minah CHA ,  Soohyeon KIM ,  Jeuk HA ,  Minhan KIM

IPC: H01M4/36 ,  C01G53/00 ,  H01M4/02 ,  H01M4/525 ,  H01M10/052

Abstract: A positive electrode active material, a preparation method thereof, and a positive electrode including the same, and a rechargeable lithium battery are provided. The positive electrode active material including particles having a core of a lithium nickel-based composite oxide, and a nickel reduction layer arranged on the surface of the core and containing nickel with an oxidation number of less than about 3+. The nickel reduction layer has a thickness of less than, or equal to, about 10 nanometer from a surface of the particle to a center of the particle.

公开(公告)号：US20220388865A1

公开(公告)日：2022-12-08

申请号：US17804999

申请日：2022-06-01

Applicant: Samsung SDI Co., Ltd.

Inventor： Soohyeon KIM ,  Sungsoo KIM ,  Jangwook LEE ,  Seungyeon CHOI

IPC: C01G53/00 ,  H01M10/0525 ,  C01F17/32

Abstract: A composite cathode active material, a method of preparing the composite cathode active material, and a lithium secondary battery including a cathode including the composite cathode active material are provided. The composite cathode active material includes: a nickel-based active material including about 60 mol % or more of nickel; and a coating layer on a surface of the nickel-based active material, the coating layer including a lanthanide composite. The composite cathode active material includes or is in the form of single crystal particles having an average particle diameter in a range of about 2 μm to about 8 μm.