Patent ID: 8753774
Filing Date: 2014-06-17
Classification: H01M,Y02E

Abstract:
1. A negative electrode material for a secondary battery with a non-aqueous electrolyte comprising at least: a silicon-silicon oxide composite having a structure that silicon particles having a size of 0.5 to 50 nm are dispersed to silicon oxide in an atomic order and/or a crystallite state, the silicon-silicon oxide composite having a Si/O molar ratio of 1/0.5 to 1/1.6; and a carbon coating formed on a surface of the silicon-silicon oxide composite at a coating amount of 1 to 40 mass % with respect to an amount of the silicon-silicon oxide composite, wherein at least the silicon-silicon oxide composite is doped with lithium at a doping amount of 0.1 to 20 mass % with respect to an amount of the silicon-silicon oxide composite, and 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 x-ray diffraction using Cu—Kα ray.