Provided are a negative electrode active material for a rechargeable lithium battery, which includes a first silicon oxide and a second silicon oxide with a particle diameter differing from the one of the first silicon oxide, a negative electrode including...

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 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...

A lithium ion secondary cell having a high capacity, improved first charge/discharge efficiency and improved cycle performance is obtainable using as the negative electrode material a lithium-containing silicon oxide powder having the formula: SiLixOy wher...

A silicon oxide powder represented by the formula: SiOx wherein 1.05 ≤ x ≤ 1.5 and having a BET specific surface area of 5-300 m/g is useful as a negative electrode material to construct a lithium ion secondary cell having a high capacity and improved ...