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;
wherein, in Chemical Formula 2, R1 is hydrogen or an alkyl group having 1 to 5 carbon atoms;
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.
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