POWDER FOR LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE MATERIAL, LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE, CAPACITOR NEGATIVE ELECTRODE, LITHIUM ION SECONDARY BATTERY, AND CAPACITOR

Provided is a negative-electrode material powder used for a lithium-ion secondary battery having a large discharge capacity and sufficient cycle characteristics as being durable in use. The powder for the battery includes a conductive carbon film on a lower silicon oxide powder, surface and satisfies requirements that: Si in SiC is 15.1 wt% or less in content, or A3 (=A2-A1) is 15.1 or less, given A1 (wt%): Si content measured by acid solution process, and A2 (wt%): Si content measured by alkali solution process; and a specific resistance is 30,000 ©cm or less. In the lower silicon oxide powder, a maximum value P1 of SiO x -derived halos appearing at 2¸=10° to 30° and a value P2 of the strongest line peak of Si (111) appearing at 2¸=28.4±0.3°, in XRD using CuK± beam, preferably satisfy P2/P1