| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite carbon material for negative electrodes of lithium ion secondary battery, having higher capacity than the theoretical capacity of graphite, high energy density, excellent charging/discharging cycle characteristics, and excellent initial irreversible capacity. SOLUTION: A composite carbon material for negative electrodes of lithium ion secondary battery includes graphite core particles and a carbide layer formed on the surface of each graphite core particle. The carbide layer contains metal particles or metal compound particles which store and discharge lithium or a set of metal particles or metal compound particles which store and discharge lithium and graphite particles. The particle size aspect ratio is 1.0-2.0. COPYRIGHT: (C)2009,JPO&INPIT
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