ELECTRODE ACTIVE MATERIAL AND METHOD FOR PRODUCING ELECTRODE ACTIVE MATERIAL

An electrode active material including: a powder material that contains a Si phase composed of Si in which an element X is dissolved and a SiX compound phase composed of a compound of Si and the element X, in which the powder material has a cumulative 50% particle diameter D50 of 0.1 μm or more and 1.0 μm or less and a cumulative 99% particle diameter D99 of 3.0 μm or less, and the element X is at least one selected from Fe, Ti, Cr, Mn, Co, Ni, Zr, B, and P.