BINDER COMPOSITION FOR SECONDARY BATTERY ELECTRODE, CONDUCTIVE MATERIAL PASTE COMPOSITION FOR SECONDARY BATTERY ELECTRODE, SLURRY COMPOSITION FOR SECONDARY BATTERY ELECTRODE, ELECTRODE FOR SECONDARY BATTERY, AND SECONDARY BATTERY

A binder composition for a secondary battery electrode contains a polymer that includes a nitrile group-containing monomer unit, an aromatic vinyl monomer unit, and a linear alkylene structural unit and that has a residual mercaptan content, by mass, of not less than 1 ppm and not more than 50 ppm.