| abstract |
Disclosed are a negative electrode material for a lithium ion secondary battery, a negative electrode for a lithium ion secondary battery, and a lithium ion secondary battery that have a high capacity and excellent cycle performance. A negative electrode material for a lithium ion secondary battery includes silicon (Si) particles, graphitic particles, and a carbonaceous material, and a peak (P Si ) near 900 cm −1 observed by a Raman spectrum. the intensity ratio of 1350 cm -1 vicinity of the peak (P D) a is the average value of (P Si / P D) is 0.15 or more, a peak around 1350 cm -1 which is observed in the Raman spectrum (P D) The average value of R values (P D / P G ), which is the intensity ratio of the peak (P G ) near 1580 cm −1, is 0.9 to 1.2, and its standard deviation is 0.1 or less. , pore volume, measured by mercury porosimetry a 1.4ml / g~2.0ml / g, the specific surface area obtained by BET method comprises composite particles is 5m 2 / g~20m 2 / g Consists of. [Selection figure] None |