Importance

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Abstract

An active material comprising silicon and a compound represented by M_xSi_y, where x and y satisfy 0.1≤x/y≤7.0, and M represents one or more metalloid elements other than Si and metal elements, wherein the content of Si elements is more than 50 wt %, the content of M is less than 38 wt %, and the content of oxygen elements is less than 30 wt %; D₅₀ and D_max are less than 4.0 μm and less than 25 μm, respectively; and in an X-ray diffraction pattern measured by an X-ray diffractometer (XRD) using CuKα1 rays, the full width at half maximum of a peak A appearing at 2θ=28.42°±1.25° is 0.25° or more, and when the peak intensity of a peak B belonging to the compound is defined as I_B and the peak intensity of the peak A is defined as I_A, the ratio (I_A/I_B) of the I_A to the I_B is less than 1.

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First Claim