US 11,990,605 B2
Lithium secondary battery and method of fabricating the same
Duck Chul Hwang, Daejeon (KR); Kyung Bin Yoo, Daejeon (KR); and Kook Hyun Han, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on May 9, 2022, as Appl. No. 17/739,231.
Application 17/739,231 is a continuation of application No. 16/986,994, filed on Aug. 6, 2020, granted, now 11,355,743.
Application 16/986,994 is a continuation of application No. 15/815,795, filed on Nov. 17, 2017, granted, now 10,756,331, issued on Aug. 25, 2020.
Claims priority of application No. 10-2016-0154283 (KR), filed on Nov. 18, 2016; and application No. 10-2017-0120352 (KR), filed on Sep. 19, 2017.
Prior Publication US 2022/0336788 A1, Oct. 20, 2022
Int. Cl. H01M 4/136 (2010.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 50/124 (2021.01)
CPC H01M 4/136 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0435 (2013.01); H01M 4/131 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/625 (2013.01); H01M 10/0565 (2013.01); H01M 50/124 (2021.01); H01M 50/1245 (2021.01); H01M 4/1391 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 2300/0082 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A cathode for lithium secondary battery, comprising:
a cathode current collector; and
a cathode active material layer formed on the cathode current collector, and including a first lithium metal oxide particle and a second lithium metal oxide particle,
wherein each of the first lithium metal oxide particle and the second lithium metal oxide particle contains nickel (Ni), manganese (Mn) and cobalt (Co),
wherein the first lithium metal oxide particle includes a concentration gradient region formed only at a specific region between a central portion and a surface portion of the first lithium metal oxide particle,
wherein each of Ni, Mn and Co in the second lithium metal oxide particle has a constant concentration composition,
wherein, in the concentration gradient region, Ni has a continuously decreasing concentration in a direction from the central portion to the surface portion, Mn has a continuously increasing concentration in a direction from the central portion to the surface portion, and Co has a constant concentration,
wherein the first lithium metal oxide particle has a constant concentration composition between the central portion and the concentration gradient region, and has a constant concentration composition between the concentration gradient region and the surface portion,
wherein the first lithium metal oxide particle has a form of secondary particle in which a plurality of primary particles are aggregated, the primary particles include a particle having a rod-type shape,
wherein a blending weight ratio of the first lithium metal oxide particle and the second lithium metal oxide particle is in a range from 6:4 to 1:9.