Electrode mixture, secondary battery, and composition

Abstract

Provided is an electrode mixture including: an electrode active material; an organic solvent; a binder; and an additive; wherein the binder contains a fluorine-containing copolymer containing a vinylidene fluoride unit and a fluorinated monomer unit, provided that the vinylidene fluoride unit is excluded from the fluorinated monomer unit; the additive is a polymer material containing the following repeating unit: —[CH—CHR]— wherein R is a chain or cyclic amide group, a nitrile group, or a substituted alkyl group formed by substituting at least one of hydrogen atoms of an alkyl group having 1 to 4 carbon atoms with a chain or cyclic amide group or a nitrile group; a content of the binder is 0.1 to 1.6 parts by mass with respect to 100 parts by mass of the electrode active material; and a content of the additive is 0.001 to 0.2 parts by mass with respect to 100 parts by mass of the electrode active material.