US 11,699,791 B2
Binder for secondary battery and secondary battery including the same
Joon Sup Kim, Daejeon (KR); Sun Young Kim, Daejeon (KR); Dong Gun Lee, Daejeon (KR); and Jee Hee Lee, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Aug. 13, 2020, as Appl. No. 16/992,592.
Claims priority of application No. 10-2019-0100436 (KR), filed on Aug. 16, 2019; and application No. 10-2020-0002114 (KR), filed on Jan. 7, 2020.
Prior Publication US 2021/0050595 A1, Feb. 18, 2021
Int. Cl. H01M 4/62 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 4/38 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/622 (2013.01) [H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/364 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 10 Claims
 
1. A binder for a secondary battery, comprising:
a copolymer having a first repeating unit represented by Chemical Formula 1 below, a second repeating unit represented by Chemical Formula 2 below, and a third repeating unit represented by Chemical Formula 3 below,
wherein a ratio of a number of the first repeating unit (A) and a sum of a number of the second repeating unit and a number of the third repeating unit (B) is 90:10 to 52:48,
a ratio of the number of the second repeating unit and the number of the third repeating unit is 67:33 to 1:99, and
a weight average molecular weight of the copolymer is 225 kDa to 2,000 kDa;

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 2, R1 is hydrogen or an alkyl group having 1 to 5 carbon atoms;

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 3, R2 is hydrogen or an alkyl group having 1 to 5 carbon atoms,
Mn+ is Li+, Na+, NH4+, Ca2+, Mg2+, Al3+ or Ga3+, and
n is an integer of 1 to 3.