| 摘要 |
A negative electrode material for lithium ion secondary batteries, which contains (A) a spheroidized or ellipsoidized natural graphite having an average particle diameter of 5-35 mum and an average aspect ratio of less than 2.0, (B) a bulk mesophase graphitized material having an average particle diameter of 2-25 mum and an average aspect ratio of less than 2.0 and (C) a flake graphite having an average particle diameter of 1-15 mum, said average particle diameter being smaller than the average particle diameter of the bulk mesophase graphitized material (B), and an average aspect ratio of 5.0 or more, at a specific mass ratio; a negative electrode for lithium ion secondary batteries, which uses this negative electrode material for lithium ion secondary batteries; and a lithium ion secondary battery. |
