CARBON BLACK, SLURRY, AND LITHIUM ION SECONDARY BATTERY

Carbon black having a specific surface area of 150 m2/g or more and 400 m2/g or less and a hydrochloric acid absorption amount of 30 mL/5 g or more, wherein, when a 3 mass% slurry is prepared using N-methyl-2-pyrrolidone as a dispersion medium, the slurry viscosity at 25°C and a shear rate of 10 s-1 is 200 mPa·s or more and 1,200 mPa·s or less.