POSITIVE ELECTRODE FOR ALL-SOLID SECONDARY BATTERY AND ALL-SOLID SECONDARY BATTERY INCLUDING THE SAME

A positive electrode for an all-solid secondary battery including a sulfide-based solid electrolyte includes a first positive active material having an average particle diameter of about 15 μm to about 20 μm, a second positive active material having an average particle diameter of about 2 μm to about 6 μm, and a solid electrolyte, wherein at least one selected from the first positive active material and the second positive active material includes a coating layer including a lithium ion conductor, and each of the first positive active material and the second positive active material includes a core and a shell, wherein the shell includes a nickel-based active material containing cobalt. An all-solid secondary battery includes the positive electrode.