Composition for forming secondary battery electrode, secondary battery electrode, and secondary battery

A composition which contains at least one of an electrode active material (A) and a carbon material (B) as a conductive assistant;

• an aqueous liquid medium (D);
• and an amphoteric dispersant (C) prepared by neutralizing at least some carboxyl groups in a copolymer obtained by copolymerizing the following monomers with a basic compound:
• ethylenically unsaturated monomer having an aromatic ring (c1), which is selected from styrene, α-methylstyrene, and benzyl(meth)acrylate:
• 5 to 70% by weight;
• ethylenically unsaturated monomer having a carboxyl group (c2), which is selected from maleic acid and alkyl monoesters thereof, fumaric acid and alkyl monoesters thereof, itaconic acid and alkyl monoesters thereof, citraconic acid and alkyl monoesters thereof, phthalic acid β-(meth)acryloxyethyl monoester, isophthalic acid β-(meth)acryloxyethyl monoester, terephthalic acid β-(meth)acryloxyethyl monoester, succinic acid β-(meth)acryloxyethyl monoester, acrylic acid, methacrylic acid, crotonic acid, and cinnamic acid:
• 15 to 60% by weight;
• ethylenically unsaturated monomer having an amino group (c3), which is selected from dim ethylaminoethyl(meth)acrylate, diethyl aminoethyl(meth)acrylate, methylethylaminoethyl(meth)acrylate, dimethylamino styrene, and diethylamino styrene:
• 1 to 80% by weight;
• and
• other monomer (c4) except the monomers (c1) to (c3), which is selected from alkyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, 4-hydroxybutyl(meth)acrylate and alkylene glycol(meth)acrylate:
• 0 to 79% by weight, wherein the total of the monomers (c1) to (c4) are 100% by weight.