Method for producing composite particles for electrochemical device electrode

A method for producing composite particles for an electrochemical device electrode, wherein the composite particles comprising an electrode active material and 0.1 to 10 parts by weight of a binder relative to 100 parts by weight of the electrode active material based on a dry weight, the binder having a glass transition temperature of −30 to 30° C., the method comprising:

• preparing a composite particle slurry containing the electrode active material and the binder;
• adjusting a viscosity of the composite particle slurry;
• drying the composite particle slurry to obtain granulated particles;
• and
• classifying the granulated particles to obtain the composite particles having a cumulative 10% diameter (D10 diameter) of 20 μm or more and 100 μm or less in a particle diameter distribution in terms of a volume,
• wherein the composite particles as a powder have a pressure loss of 5.0 mbar or less and a dynamic repose angle of 20° or more and less than 40°,
• wherein the pressure loss is determined by stacking the composite particles into a composite particle layer having a height of 40 mm, compressing the composite particle layer at a force of 10 kPa, passing an air at 2 m/s through the compressed composite particle layer, and measuring a pressure difference before and after passing of the air through the compressed composite particle layer to give the pressure loss.