US 12,308,424 B2
Electrode, lithium battery including the same, and method of manufacturing the same
Ilkyong Kwon, Yongin-si (KR); Hyun Nam, Yongin-si (KR); Donggeun Lee, Yongin-si (KR); and Jinhyon Lee, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Feb. 22, 2022, as Appl. No. 17/652,009.
Claims priority of application No. 10-2021-0023688 (KR), filed on Feb. 22, 2021.
Prior Publication US 2022/0271276 A1, Aug. 25, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0585 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/623 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 2004/021 (2013.01)] 19 Claims
 
1. An electrode comprising:
an electrode active material layer comprising an electrode active material and a binder; and
an electrode current collector on one surface or between two surfaces of the electrode active material layer; and
wherein the electrode active material layer includes: a first electrode active material layer including a first electrode active material and a first binder and contacting the electrode current collector; and a second electrode active material layer on the first electrode active material layer and comprising a second electrode active material layer and a second binder,
wherein the first electrode active material layer has, as measured by a surface and interfacial cutting analysis system (SAICAS), a first ratio of change of vertical relative force (FVR) between a first point, which is 5% away from a surface of the first electrode active material layer facing away from the electrode current collector, and a second point, which is 5% away from a surface of the electrode current collector with respect to a total thickness of the first electrode active material layer,
the second electrode active material layer has, as measured by the SAICAS, a second ratio of change of vertical relative force (FVR) between a third point, which is 5% away from a surface of the second electrode active material layer facing away from the first electrode active material layer, and a fourth point, which is 5% away from the surface of the first electrode active material layer with respect to the total thickness of the second electrode active material layer, and
the first ratio of change of the first electrode active material layer differs from the second ratio of change of the second electrode active material layer, and the second ratio of change of the second electrode active material layer is 300% or less.