| 摘要 |
A secondary battery having a high capacity and superior cycle characteristics and an anode active material used for it are provided. The anode active material contains, as an element, at least tin (Sn), iron (Fe), cobalt (Co), and carbon (C). A carbon content is in the range from 11.9 wt % to 29.7 wt %, a total ratio of iron and cobalt to a total of tin, iron, and cobalt is in the range from 26.4 wt % to 48.5 wt %, and a cobalt ratio to a total of iron and cobalt is in the range from 9.9 wt % to 79.5 wt %. A reactive phase capable of reacting with an electrode reactant is included. A half-width of a diffraction peak obtained by X-ray diffraction (peak observed at diffraction angle 2theta of between 41 degrees and 45 degrees) is 1.0 degree or more.
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