US 12,394,785 B2
Cathode for lithium secondary battery and lithium secondary battery including the same
Min Gu Kang, Daejeon (KR); Min Suk Kang, Daejeon (KR); and Soo Ho Kim, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Feb. 15, 2022, as Appl. No. 17/671,686.
Claims priority of application No. 10-2021-0020392 (KR), filed on Feb. 16, 2021.
Prior Publication US 2022/0271278 A1, Aug. 25, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/131 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/131 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/621 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A cathode for a lithium secondary battery, comprising:
a cathode current collector; and
a cathode active material layer comprising a first cathode active material layer and a second cathode active material layer sequentially stacked on the cathode current collector, wherein the first cathode active material layer comprises a first cathode active material particle having a secondary particle structure, and the second cathode active material layer comprises a second cathode active material particle having a single particle shape,
wherein an adhesive force of the first cathode active material layer to a surface of the cathode current collector is greater than an adhesive force of the second cathode active material layer to a surface of the first cathode active material layer; and a ratio of the adhesive force of the first cathode active material layer to the surface of the cathode current collector relative to the adhesive force of the second cathode active material layer to the surface of the first cathode active material layer is from 1.4 to 8.1, and
wherein a ratio of the content of the binder in the first cathode active material layer relative to the content of the binder in the second cathode active material layer is from 2 to 4.