US 12,394,786 B2
Electrode, secondary battery comprising electrode and method for preparing electrode
Jong Hyuk Lee, Daejeon (KR); Hee Gyoung Kang, Daejeon (KR); and Mi Ryeong Lee, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Mar. 31, 2022, as Appl. No. 17/710,448.
Claims priority of application No. 10-2021-0043065 (KR), filed on Apr. 2, 2021.
Prior Publication US 2022/0320502 A1, Oct. 6, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/0471 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An electrode comprising:
an electrode current collector and an electrode active material layer on at least one surface of the electrode current collector,
wherein the electrode active material layer has a thickness of 200 μm or more, and when the electrode active material layer is divided into three portions of a surface layer portion, a middle layer portion, and a lower layer portion in a thickness direction, a difference in porosity between the surface layer portion and the lower layer portion by XRM analysis is 10% or less, and
wherein the electrode has a weight loss ratio of 2.5 wt % or more between TGA 200 and 500° C.