Patent ID: 8920977

Claim:
A negative electrode material for nonaqueous electrolyte secondary battery, comprising a carbon material (A) and a carbon material (B), wherein the carbon material (A) is a multilayer-structure carbon material comprising a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, and wherein the carbon material (A) has: an interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method of 3.37 Å or less; a crystallite size (Lc) of 900 Å or more; a tap density of 0.8 g/cm 3 or more; and a Raman R value, as a ratio of a peak intensity near 1,360 cm −1 to a peak intensity near 1,580 cm −1 in the argon ion laser Raman spectrum, from 0.25 to 0.6, and wherein the carbon material (B), which is not a multilayer-structure carbon material, comprises a graphitic particle, and wherein the carbon material (B) has: an interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method of 3.37 Å or less; a crystallite size (Lc) of 900 Å or more; a tap density of 0.8 g/cm 3 or more; a Raman R value, as a ratio of a peak intensity near 1,360 cm −1 to a peak intensity near 1,580 cm −1 in the argon ion laser Raman spectrum, from 0.2 to 0.5; and an average degree of circularity, as determined by a flow-type particle analyzer, of 0.9 or more.