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Abstract

Provided is a negative-electrode material powder for a lithium-ion secondary battery including a conductive carbon film on the surface of a silicon oxide powder, in which the total content of tar components is not less than 1 ppm and not more than 4000 ppm, and in the Raman spectrum, peaks exist at 1350 cm⁻¹ and 1580 cm⁻¹, while the peak at 1580 cm⁻¹ has a half-value width of not less than 50 cm⁻¹ and not more than 100 cm⁻¹. In the negative-electrode material powder, a specific surface area is preferably not less than 0.3 m²/g and not more than 40 m²/g, and the proportion of the conductive carbon film is preferably not less than 0.2 mass % and not more than 10 mass %. This makes it possible to provide a negative-electrode material powder which can be used to obtain a lithium-ion secondary battery with large discharge capacity and satisfactory cycle characteristics.

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First Claim