Electrode active material and method for producing electrode active material

Abstract

This invention relates to an electrode active material, comprising: a powder material containing a Si phase composed of Si dissolved in it and a SiX compound phase composed of a compound of Si and element X, wherein the powder material has a cumulative 50% particle size D50 of 0.1 μm and 1.0 μm and a cumulative 99% particle size D99 of 3.0 μm and 1.0 μm and ..., and the element X is selected from at least one of Fe, Ti, Cr, Mn, Co, Ni, Zr, B and P. 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 Co, Ni, Zr, B, and P.

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