Dispersant composition for electrochemical device, conductive material dispersion liquid for electrochemical device, slurry for electrochemical device electrode, electrode for electrochemical device, and electrochemical device

A conductive material dispersion liquid for an electrochemical device comprising at least:

• a dispersant composition for an electrochemical device containing a polymer A;
• a conductive material;
• and a solvent, and having a solid content concentration of not less than 0.01 mass % and not more than 10 mass % and a viscosity at a shear rate of 10 s−1 of not less than 0.05 Pa·s and not more than 15.0 Pa·s, wherein
• the polymer A includes a acrylonitrile monomer unit an alkylene structural unit derived from 1,3-butadiene, or the polymer A includes the acrylonitrile monomer unit and a 2-ethylhexyl acrylate monomer unit, a styrene monomer unit, and a methacrylic acid monomer unit,
• the polymer A satisfies at least one of the following features I and II:
• feature I:
• the polymer A includes the acrylonitrile monomer unit in a proportion of not less than 15 mass % and not more than 50 mass % and proportional content of the alkylene structural units derived from 1,3-butadiene in the polymer A is 40 mass % or more and is 90 mass % or less, when all repeating units in the polymer A are taken to be 100 mass %, and an iodine value of the polymer A is 1 mg/100 mg or more and 60 mg/100 mg or less, and
• feature II:
• proportional content of the acrylonitrile monomer unit in the polymer A is not less than 15 mass % and not more than 50 mass % and a rest of the polymer A is occupied by the 2-ethylhexyl acrylate monomer unit, the styrene monomer unit, and the methacrylic acid monomer unit,
• the dispersant composition including the polymer A and the substituted phenol has an intrinsic viscosity of not less than 0.15 dL/g and less than 1.20 dL/g when dissolved in N-methyl-2-pyrrolidone and measured at a temperature of 25° C., and
• the conductive material is one or more carbon nanotubes and
• the dispersant composition for an electrochemical device further contains not less than 0.01 mass % and not more than 0.2 mass % of a substituted phenol relative to the polymer A.