| 摘要 |
An anode active material capable of preventing shape deformation due to expansion and shrinkage and a battery using the anode are provided. An anode active material layer contains a powdery anode active material containing Si or Sn as an element. The average degree of circularity of the anode active material is 0.90 or less. By decreasing the average degree of circularity, the surface area becomes wide, and the reactive region becomes large. As a result, an intense local reaction is prevented, and the number of cracks resulting from expansion and shrinkage are reduced.
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