DEVICE AND METHOD FOR MANUFACTURING ACTIVE MATERIAL MIXTURE

When mixing is performed to make an active material mixture while circulating a dispersion medium through a rotor provided with stirring blades, the solid electrolyte is likely to aggregate, and it is difficult to reduce the particle size of the mixture. There is a problem that the temperature of the material is likely to increase when the rotation speed of the rotor is increased in order to reduce the particle size of the mixture. In order to solve this problem, provided is a method for manufacturing an active material mixture, the method including: supplying and dispersing a solid electrolyte in a dispersion medium while circulating the dispersion medium (a first dispersion step); and thereafter supplying and dispersing an active material and a conductive material in the dispersion medium (a second dispersion step), wherein an average rotation speed of the rotor in the second dispersion step is lower than an average rotation speed of the rotor in the first dispersion step. Aggregation of the solid electrolyte can be suppressed by separately performing the first dispersion step and the second dispersion step, and the increase in temperature of the active material mixture can be reduced by lowering the rotation speed of the rotor in the second dispersion step.