Method for producing carboxymethyl cellulose salt for electrode of non-aqueous electrolyte secondary battery, electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

摘要

Carboxymethylcellulose salt for electrodes of non-aqueous electrolyte secondary batteries that can achieve both prevention of defects such as streaks and pinholes on the electrode coating surface, and excellent adhesion strength to current collectors and adhesion strength between active materials The purpose is to provide. (1) Alkaline celluloseation using a mixed solvent in which the mixing ratio (mass ratio) of alcohol having 3 or less carbon atoms and water is 75:25 to 95: 5, and the alkali concentration relative to water is 25 to 40% by mass A reaction step, (2) an etherification reaction step in which the reaction is carried out in an excess of alkali of 0.2 to 0.5 mol per anhydroglucose unit of the cellulose, (3) an acid is added after completion of the etherification reaction, and the pH of the reaction mixture is increased. And (4) after completion of the neutralization step, the mixed solvent is removed, an alkali is added, and the pH of the reaction mixture is adjusted to 8.0 to 9.0. The manufacturing method including the heating process which heat-processes for 30 to 120 minutes at 40-70 degreeC after adjustment.