US 12,074,310 B2
Lithium secondary battery
Soo Ho Kim, Daejeon (KR); Min Gu Kang, Daejeon (KR); Young Hoon Do, Daejeon (KR); and Yong Hyun Cho, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Jul. 14, 2022, as Appl. No. 17/865,075.
Application 17/865,075 is a continuation of application No. 16/247,732, filed on Jan. 15, 2019, granted, now 11,430,975.
Claims priority of application No. 10-2018-0005123 (KR), filed on Jan. 15, 2018.
Prior Publication US 2022/0352494 A1, Nov. 3, 2022
Int. Cl. H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/131 (2013.01) [H01M 4/364 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium secondary battery, comprising:
a first cathode active material including a first lithium metal oxide containing nickel and including a concentration gradient region between a central portion and a surface, the first lithium metal oxide having a secondary particle structure; and
a second cathode active material including a second lithium metal oxide containing nickel, cobalt, and manganese, the lithium metal oxide having a single particle structure,
wherein a content of nickel at an entire region of the first cathode active material is greater than a content of nickel included in the second cathode active material,
wherein a blending weight ratio of the first cathode active material and the second active material is in a range from 30:70 to 10:90,
wherein a molar ratio of manganese included in the second cathode active material relative to a total number of moles of metals included in the second cathode active material excluding lithium is 0.313 to 0.353.