Patent ID: 8105718

Claim:
A negative electrode material for non-aqueous electrolyte secondary batteries, comprising an active material and 1 to 20% by weight of a binder, wherein said active material comprises silicon oxide particles and silicon particles, and the silicon particles are present in an amount of not more than 50% by weight based on the active material, wherein the silicon oxide particles are silicon oxide particles coated on their surface with a graphite coating, and said silicon oxide particles coated on their surface with a graphite coating are present in an amount of 70 to 95% by weight based on the active material, said graphite coating, on Raman spectroscopy, exhibits scattering peaks having an intensity I 1330 and I 1580 at 1330 cm −1 and 1580 cm −1 , an intensity ratio I 1330 /I 1580 being in the range: 1.5<I 1330 /I 1580 <3.0, and the coated silicon oxide particles, on solid NMR ( 29 Si-DDMAS) analysis, exhibit a signal area S -84 around −84 ppm and a broad signal area S -110 centering around −110 ppm, an area ratio S -84 /S -110 being in the range: 0.5<S -84 /S -110 <1.1.