US 12,334,511 B2
Electrode, secondary battery comprising the same, and method for preparing the same
Byung Chan Kang, Daejeon (KR); Yong Hee Kang, Daejeon (KR); Sung Jun Park, Daejeon (KR); and Byoung Wook Jo, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Dec. 30, 2021, as Appl. No. 17/565,554.
Claims priority of application No. 10-2021-0002295 (KR), filed on Jan. 8, 2021.
Prior Publication US 2022/0223921 A1, Jul. 14, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/1393 (2010.01)
CPC H01M 10/0587 (2013.01) [H01M 4/0404 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electrode for a secondary battery, comprising:
an electrode current collector; and
an electrode active material layer formed on at least one surface of the electrode current collector,
wherein the electrode active material layer comprises an H1 region, an H2 region and an H3 region sequentially provided from an end of the electrode active material layer toward a center,
the H2 region comprises an inclined section in which a thickness increases from the H1 region toward the H3 region,
the H1 region is a region having the end of the electrode active material layer as a starting point, and any one point between 4 and 5 mm from the starting point as an endpoint,
the H2 region is a region having an endpoint of the H1 region as a starting point, and any one point between 8 and 9 mm from the end of the electrode active material layer as an endpoint, and
the electrode satisfies the following formulas (1) and (2),
0.2≤h1/h2≤0.7  (1)
h2/h3≥0.9  (2),
where h1 is an average thickness of the H1 region, h2 is an average thickness of the H2 region, and h3 is an average thickness of the H3 region.