| 摘要 |
[Problem] To provide a means that makes achieving sufficient cycle durability possible, while taking sufficient advantage of the high capacity properties characteristic of solid-solution positive electrode materials, in an electrical device such as a lithium-ion secondary battery having a positive electrode using a solid-solution positive electrode active material. [Solution] As the Si-containing alloy to be contained in the negative electrode active material layer, the present invention uses an alloy having a prescribed composition and a structure obtained by dispersing a silicide phase containing a transition metal silicide in a parent phase having amorphous or low-crystalline silicon as the principal component thereof, wherein the ratio (B/A) of the diffraction peak intensity B of the transition metal silicide in the range of 2θ=37-45°C to the diffraction peak intensity A of the Si (111) surface in the range of 2θ=24-33°C, when measuring using X-ray diffraction using CuKα1 rays, falls within a prescribed range. As the solid-solution positive electrode active material to be included in the positive electrode active material layer, the present invention uses a prescribed metal-doped solid solution. |
