Method for manufacturing electrochemical device electrode

A method for manufacturing an electrochemical device electrode using composite particles for an electrochemical device electrode having an electrode active material (A), a particulate binder resin (B), a water-soluble polymer (C), and a composite (D) of a water-soluble polymer (d′) and crystalline cellulose (d″), the method comprising:

• a step of obtaining the composite (D) by wet mixing and drying the crystalline cellulose (d″) and the water-soluble polymer (d′) containing a cellulose-based polymer and/or a polysaccharide-based polymer, the composite being the crystalline cellulose (d″) surface-treated with the water-soluble polymer (d′) containing a cellulose-based polymer and/or a polysaccharide-based polymer;
• a step of preparing a slurry for composite particles having a viscosity of 10 to 3,000 mPa·s by dispersing or dissolving the electrode active material (A), the particulate binder resin (B), the water-soluble polymer (C), and the composite (D) in a solvent;
• a step of obtaining composite particles for an electrochemical device electrode by spray drying the slurry for composite particles;
• and
• a step of molding the composite particles into an electrode active material layer by supplying the composite particles on a current collector, followed by the composite particles being directly subjected to pressure molding on the current collector, wherein
• the particulate binder resin (B) is a conjugated diene-based polymer or an acrylate-based polymer,
• the water-soluble polymer (C) is at least one selected from the group of a cellulose-based polymer, polyacrylic acid, polyvinyl alcohol, and poly-N-vinylacetamide,
• 1 to 15 parts by weight of the particulate binder resin (B) on a dry weight basis are contained with respect to 100 parts by weight of the electrode active material (A),
• 0.2 to 1.3 parts by weight of the water-soluble polymer (C) are contained with respect to 100 parts by weight of the electrode active material (A),
• 0.1 to 1.2 parts by weight of the composite (D) are contained with respect to 100 parts by weight of the electrode active material (A), and
• a weight ratio (C)/(D) of the water-soluble polymer (C) to the composite (D) is 0.2 to 15.