Patent ID: 10164260

Abstract:
Provided is a method for producing a positive electrode for a nonaqueous electrolyte secondary battery having superior electrical conductivity with high productivity. The production method disclosed herein includes the following steps: a first kneading step (S10) for kneading electrically conductive carbon fine particles and a hydrophobic binder that gels when contacted by water, in N-methyl-2-pyrrolidone (NMP); a second kneading step (S20) for adding a positive electrode active material and water to a first kneaded product obtained in the first kneading step followed by additional kneading; and a step (S30) for forming a positive electrode active material layer on the surface of a positive electrode current collector by coating a second kneaded product obtained in the second kneading step on the positive electrode current collector. The first kneaded product contains moisture, and the ratio of the mass of the moisture to the mass of the NMP is 0.002 or less in the first kneaded product, while in the second kneading step (S20), the water is added at a mass ratio of 0.0022 to 0.0115 based on the mass of the NMP.