| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbonaceous material having high charge and discharge capacity and superior cycle characteristics, at the same time. SOLUTION: Composite particles 3, each of which contains at least silicon and carbon and has a smaller particle diameter than that of a graphite particle 2, are dispersedly disposed around the graphite particle 2 in which a spacing d002 of a (002) plane obtained by wide-angle X-ray diffraction is less than 0.337 nm, and the graphite particle 2 and the composite particles 3 are coated by an amorphous carbon film 4. In this composite particle 3, a conductive carbon material is disposed around a Si grain comprising crystalline silicon, and the Si grains and the conductive carbon material are coated by a hard carbon film. Si grains are of a SiO2 phase, SiC phase and SiB4 phase deposited in the crystalline Si phase. The carbonaceous material 1 having this characteristic is adopted. |
