| abstract |
The present invention provides an aqueous binder for a secondary battery capable of imparting excellent binding properties and good slurry stability, a composition for a mixture layer of a secondary battery electrode obtained by using the binder, and a secondary battery electrode. To do. A binder for a secondary battery electrode containing a carboxyl group-containing polymer or a salt thereof, wherein the carboxyl group-containing polymer is a structural unit derived from an ethylenically unsaturated carboxylic acid monomer with respect to all structural units thereof. Is contained in an amount of 50% by mass or more and 99.9% by mass or less, and 0.1% by mass or more and 4.9% by mass or less of structural units derived from the nitrile group-containing ethylenically unsaturated monomer. |