公开(公告)号：US20210408528A1

公开(公告)日：2021-12-30

申请号：US17359143

申请日：2021-06-25

Applicant: Samsung SDI Co., Ltd.

Inventor： Youngjoo CHAE ,  Gwiwoon KANG ,  Youngsun KONG ,  Sangmi KIM ,  Youngki KIM ,  Jinyoung KIM ,  Jaeyoung JEONG ,  Soonkie HONG

IPC: H01M4/36 ,  H01M4/525 ,  H01M10/0525 ,  C01G53/00

Abstract: Disclosed herein are a nickel-based lithium metal composite oxide, a method of preparing the same, and a lithium secondary battery including a positive electrode including the same. The nickel-based lithium metal composite oxide includes secondary particles including aggregates of primary particles, wherein a content of nickel in the nickel-based lithium metal composite oxide is 50 mol % or more, based on the total content of transition metals in the nickel-based lithium metal composite oxide, the secondary particles include large secondary particles having a particle size of 10 μm or more and small secondary particles having a particle size of 5 μm or less, and the content of nickel in the large secondary particles is larger than the content of nickel in the small secondary particles.