US 12,482,813 B2
Cathode for lithium secondary battery and lithium secondary battery including the same
Min Gu Kang, Daejeon (KR); Sang Han Lee, Daejeon (KR); and Yong Hyun Cho, 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. 17/671,706.
Claims priority of application No. 10-2021-0020435 (KR), filed on Feb. 16, 2021.
Prior Publication US 2022/0263078 A1, Aug. 18, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 9 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 first cathode active material particles having a secondary particle structure, and the second cathode active material layer comprises second cathode active material particles having a single particle shape, and
wherein a ratio of a SPAN value defined as Equation 1 of the second cathode active material particles relative to a SPAN value defined as Equation 1 of the first cathode active material particles is in a range from 2 to 4.5:

OG Complex Work Unit Math
wherein, in Equation 1, D10, D50 and D90 are particle diameters at cumulative volume percents of 10%, 50% and 90%, respectively, in a cumulative volume particle diameter distribution,
wherein the SPAN value of the second cathode active material particles is in a range from 1.17 to 1.7, and the SPAN value of the first cathode active material particles is in a range from 0.3 to 0.6.