| abstract |
The present invention relates to a negative electrode material containing nanosilicon, amorphous carbon and graphite, having a 10% diameter (D 10 ) of 3.5 to 9 μm in terms of volume-based cumulative distribution, a BET specific surface area of 1 to 5 m 2 / (A / B) of the peak area (A) derived from Si in the vicinity of 99 eV to the peak area (B) derived from the silicon oxide near 103 eV observed in the photoelectron spectroscopy (XPS) is 0.01 to 0.10 , And a composite material in which amorphous carbon containing nanosilicon is attached to the surface of graphite particles, and a lithium ion battery using the same. The negative electrode material of the present invention has a high discharging capacity of 600 mAh / g or more, a high initial coulomb efficiency, and a high cycle characteristic, and the characteristics (initial culm efficiency and cycle characteristics) of the lithium ion battery using the negative electrode material are improved. |