二次電池用負極材

Japanese Patent JP7291762

B2

A negative electrode material for a secondary battery according to the present invention includes a matrix containing silicon oxide, a composite oxide of one or more doping elements selected from the group includingan alkali metal, an alkaline earth metal, and a post-transition metal, and silicon, or a mixture thereof; and silicon nanoparticles dispersed and embedded in the matrix, wherein in an X-ray diffraction pattern using a CuKα ray, a ratio (A₁/A₂) of an area (A₁) of a first peak present in a region where a diffraction angle 2θ is 10° to 27.4° to an area (A₂) of a second peak present in a region where the diffraction angle 2θ is 28 ± 0.5° is 0.8 to 6, and the following Expression 1 is satisfied, 1