ELECTRODE BASE MATERIAL, ELECTRODE BASE MATERIAL LAMINATE, ELECTRODE, SECONDARY BATTERY, AND METHODS FOR MANUFACTURING SAME

Provided is a material sheet comprising a resin base material and a particle layer comprising an active material particle and a solid electrolyte particle, an average circle-equivalent diameters of the active material particles and the solid electrolyte particles satisfy specific relationship, when, among the solid electrolyte particles, particles exceeding a specific size are defined as the first solid electrolyte particles, and particles equal to or less than a specific size are defined as the second solid electrolyte particles, the active material particles and the first solid electrolyte particles are arranged adjacently, and in cross-section observation of the particle layer, at least 80 number % of the second solid electrolyte particle is predominantly distributed on a side of the particle layer in contact with the resin base material or on a side opposite to the resin base material relative to a reference line.