公开(公告)号：US20210066712A1

公开(公告)日：2021-03-04

申请号：US16960791

申请日：2019-03-06

Applicant: Samsung SDI Co., Ltd.

Inventor： Young-Ki KIM ,  Soonrewl LEE ,  Young-Hun LEE ,  Jiyeon JANG ,  Ickkyu CHOI ,  Mingzi HONG ,  Soonkie HONG

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  H01M4/134 ,  H01M4/1391 ,  H01M4/1395 ,  H01M4/04 ,  H01M10/0525

Abstract: The present invention relates to a positive electrode active material for a rechargeable lithium battery and a rechargeable lithium battery including same, wherein the positive electrode active material comprises a core and a surface layer formed on the surface of the core, the core comprising a first crystalline structure, the surface layer comprising a first crystalline structure and a second crystalline structure different from the first crystalline structure, the first crystalline structure being present more than the second crystalline structure in the surface layer.

公开(公告)号：US20200067090A1

公开(公告)日：2020-02-27

申请号：US16547422

申请日：2019-08-21

Applicant: Samsung SDI Co., Ltd.

Inventor： Soonkie HONG ,  Young-Ki KIM ,  Soonrewl LEE ,  Young-Hun LEE ,  Jiyeon JANG ,  Ickkyu CHOI ,  Mingzi HONG

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/131 ,  C01G51/00

Abstract: A positive active material for use in a positive electrode and a rechargeable lithium battery includes a lithium cobalt oxide including a secondary particle having an average particle diameter of about 15 μm to about 25 μm, wherein the secondary particle includes a plurality of primary particles having an average particle diameter of about 2 μm to about 10 μm, and the positive active material has a pellet density of greater than or equal to about 3.80 g/cm3. A method of manufacturing the positive active material includes heat-treating a cobalt-containing compound at a temperature of greater than or equal to about 900° C. to form a cobalt oxide comprising Co3O4 and CoO, and reacting the cobalt oxide with a lithium compound to prepare the lithium cobalt oxide.