Patent ID: 8889294

Claim:
A negative electrode material for a secondary battery with a non-aqueous electrolyte, the negative electrode material comprising, prior to a first charge: a silicon-silicon oxide composite doped with lithium; and a carbon coating formed on a surface of the silicon-silicon oxide composite, wherein: a ratio I(SiC)/I(Si) of a peak intensity I(SiC) attributable to SiC of 2θ=35.8±0.2° to a peak intensity I(Si) attributable to Si of 2θ=28.4±0.2° satisfies a relation of I(SiC)/I(Si)≦0.03, when an x-ray diffraction is performed on the negative electrode material using a Cu—Kα ray, and a peak attributable to lithium aluminate is further observed in the negative electrode material for a secondary battery with a non-aqueous electrolyte, when the x-ray diffraction is performed on the negative electrode material using a Cu—Kα ray.