| abstract |
A composition serving as a binder with well-balanced peel strength, high-rate discharge capacity retention ratio, and penetration resistance, a slurry for positive electrode, and a secondary battery using the composition is provided. n According to the present invention, a composition containing a graft copolymer is provided. The graft copolymer has a stem polymer and a plurality of branch polymers, the stem polymer has a polyvinyl alcohol structure, each of a first monomer unit and a second monomer unit is included in at least one of the plurality of branch polymers, the second monomer unit is different from the first monomer unit, when a content of the polyvinyl alcohol structure in the composition is C PVA % by mass and a total content of the first monomer unit and the second monomer unit in the composition is C M % by mass, the ratio of the content of the polyvinyl alcohol structure to the total content of the first monomer unit and the second monomer unit (C PVA /(C M +C PVA )) is 0.05 to 0.7, and the composition has a swelling degree of 200 to 900% with respect to propylene carbonate. |