Manufacturing method of carboxymethyl cellulose salt for electrode of nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A manufacturing method of a carboxymethyl cellulose salt for an electrode of a nonaqueous electrolyte secondary battery in which an etherification reaction is performed after an alkali cellulose reaction of a base and a cellulose, characterized in that the following steps are comprised:

• (1) an alkali cellulose reaction step in which a mixed solvent having a mixing ratio (a mass ratio) of 75:25 to 95:5 of an alcohol having a carbon number of 3 or less and a water is used, and a concentration of the base to the water is 25 mass % to 40 mass %;
• (2) an etherification reaction step in which a reaction is carried out under an excess base of 0.2 moles to 0.5 moles per unit of an anhydroglucose of the cellulose;
• (3) a neutralization step in which an acid is added after the etherification reaction is complete to adjust a pH of the reaction mixture to 6.0 to 8.0;
• and
• (4) a heating step in which the mixed solvent is removed after the neutralization step is complete, and a base is added to adjust the pH of the reaction mixture to 8.0 to 9.0, and then a heat treatment is performed at 40° C. to 70° C. for 30 minutes to 120 minutes.