Carbon nanotube dispersion composition, mixture slurry, electrode film, and secondary battery

A carbon nanotube dispersion composition comprising carbon nanotubes (A), a dispersant (B), and a solvent (C), wherein

• a particle diameter D50 at a cumulative volume of 50% according to laser diffraction particle size distribution measurement is 0.3 to 7 μm, and
• the carbon nanotube dispersion composition satisfies (1) and (2) below:
• (1) the dispersant (B) is a polymer that has a weight average molecular weight of 5,000 or more and 360,000 or less and comprises a carboxyl group-containing structural unit derived from at least one of (meth)acrylic acid and (meth)acrylate having a carboxyl group, wherein
• a content ratio of the carboxyl group-containing structural unit is 80 mass % or more based on a mass of the polymer;
• and
• (2) in a case where the particle diameter D50 at a cumulative volume of 50% according to laser diffraction particle size distribution measurement of the carbon nanotube dispersion composition is X [μm], and a pH is Y, X and Y satisfy (Formula a) and (Formula b) below:
• Y
• ≥
• -
• 0
• .
• 1
• ⁢
• 4
• ⁢
• 9
• ⁢
• X
• +
• 4
• .545
• (
• Formula
• ⁢
• a
• )
• Y
• ≤
• -
• 0
• .
• 1
• ⁢
• 3
• ⁢
• 4
• ⁢
• X
• +
• 5
• .140
• ,
• (
• Formula
• ⁢
• b
• )
• a BET specific surface area according to nitrogen adsorption measurement of the carbon nanotubes (A) is 100 m2/g or more and 1200 m2/g or less,
• in the case where the BET specific surface area is 100 m2/g or more and less than 700 m2/g, a G/D ratio is 0.8 or more and 8 or less, and
• in the case where the BET specific surface area is 700 m2/g or more and 1200 m2/g or less, the G/D ratio is 30 or more and 100 or less, and
• wherein no dispersant other than the dispersant (B) is present.