Abstract: A negative electrode material for a secondary battery includes a matrix containing silicon oxide, a composite oxide of one or more doping elements selected from the group consisting of an 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 a hardness and a Young's modulus measured by a nanoindentation test are 4.0 GPa or more and 40 GPa or more, respectively, and in an X-ray diffraction pattern using a CuK? ray, a ratio (A1/A2) of an area (A1) of a first peak present in a region where a diffraction angle 2? is 10° to 27.4° to an area (A2) of a second peak present in a region where the diffraction angle 2? is 28±0.5° is 0.8 to 6.

Abstract: A negative electrode material for a secondary battery includes a matrix containing silicon oxide, a composite oxide of one or more doping elements selected from an 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.

Abstract: Provided is a negative electrode material for a secondary battery. The negative electrode material for a secondary battery contains: a matrix containing a silicon oxide, a complex oxide of one or more doping elements selected from the group consisting of an alkali metal, an alkaline earth metal and a post-transition metal, and silicon, or a mixture thereof; and silicon nanoparticles dispersed and impregnated in the matrix, wherein the negative electrode material for a secondary battery satisfies the following Equation: 1<WN(Si)/WN(ref), wherein WN(ref) is a central wavenumber of a Raman peak of bulk single-crystal silicon, and WN(Si) is a central wavenumber of a Raman peak of nanoparticulate silicon contained in the negative electrode material.