In a lithium ion secondary battery using a negative electrode material powder including a lower silicon oxide powder as a negative electrode material, a charge electric potential at 0.45-1.0 V relative to a Li reference upon initial charging results in a l...

Provided is a negative-electrode material powder for a lithium-ion secondary battery including a conductive carbon film on the surface of a lower silicon oxide powder, in which the total content of tar components measured by TPD-MS is not less than 1 ppm b...

A negative electrode material powder for a lithium ion secondary battery having a conductive carbon film on the surface of a lower-silicon-oxide powder; wherein a specific surface area in BET measurement ranges from more than 0.3 m/g to 40 m/g, and no SiC ...

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 lowe...

Provided is a negative-electrode material powder for lithium-ion secondary battery including a silicon-rich layer on the surface of a lower silicon oxide powder, and a negative-electrode material powder for said battery comprising a silicon oxide powder, c...

Provided is a negative electrode active material for a lithium-ion secondary battery, comprising SiO x that has an intensity ratio A 1 /A 2 of 0.1 or less in spectra measured by a Fourier transform infrared spectrometer after subjecting the SiO x to evacua...

Provided is SiO, wherein the amount of generated HO gas detected in a temperature range of 200 to 800°C in a temperature-programmed desorption gas analysis is 680 ppm or less. The amount of the generated HO is desirably 420 ppm or less. In addition, in a ...

Provided is a silicon oxide in the form of powder, which is used for a negative electrode active material of a lithium-ion secondary battery and is represented by SiO, wherein, when the silicon oxide is measured by use of an X-ray diffractometer comprising...

Provided is a silicon oxide to be used for a negative electrode active material of a lithium-ion secondary battery, characterized in that : a g-value measured by an ESR spectrometer is in the range of not less than 2.0020 to not more than 2.0050; and given...