US 11,855,248 B2
Electrode for secondary battery
Hyo Mi Kim, Daejeon (KR); and Kwang Ho Jeong, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jul. 14, 2021, as Appl. No. 17/375,055.
Claims priority of application No. 10-2020-0087785 (KR), filed on Jul. 15, 2020.
Prior Publication US 2022/0020995 A1, Jan. 20, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/36 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/622 (2013.01) [H01M 4/366 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electrode for a secondary battery comprising:
a current collector;
a first electrode mixture layer disposed on at least one surface of the current collector and including carboxymethyl cellulose and styrene butadiene rubber,
wherein the styrene butadiene rubber included in the first electrode mixture layer comprises 40 to 90 mol % of a butadiene monomer based on a total content of a monomer; and
a second electrode mixture layer disposed on the first electrode mixture layer and including carboxymethyl cellulose, wherein a weight average molecular weight of the carboxymethyl cellulose included in the first electrode mixture layer is less than a weight average molecular weight of the carboxymethyl cellulose included in the second electrode mixture layer,
wherein the second electrode mixture layer further comprises styrene butadiene rubber, a weight of the styrene butadiene rubber included in the second electrode mixture layer is equal to or less than a weight of styrene butadiene rubber included in the first electrode mixture layer, and the styrene butadiene rubber included in the second electrode mixture layer comprises 5 to 35 mol % of a butadiene monomer based on a total content of a monomer.