METHOD FOR PRODUCING CARBOXYMETHYL CELLULOSE SALT FOR ELECTRODES OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The purpose of the present invention is to provide a carboxymethyl cellulose salt for the electrode of a nonaqueous electrolyte secondary battery, which is capable of achieving a good balance between prevention of defeats such as streaks and pinholes on a coated electrode surface and excellent adhesive strength to a current collector or excellent adhesive strength between active materials. A manufacturing method which includes: (1) an alkali cellulose reaction step wherein a mixed solvent having a mixing ratio (a mass ratio) of an alcohol having a carbon number of 3 or less and water of 75:25 to 95:5 is used, and the concentration of the base to the water is 25 to 40 mass%; (2) an etherification reaction step wherein a reaction is carried out under an excess base of 0.2 to 0.5 moles per unit of an anhydroglucose of the cellulose; (3) a neutralization step wherein acid is added after the etherification reaction is complete to adjust the pH of the reaction mixture to 6.0 to 8.0; and (4) a heating step wherein 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 to 70°C for 30 to 120 minutes.