| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbon material, in which discharge capacity reaches about 350-370 Ah/kg which close to is theoretical capacity, initial efficiency is kept higher than 90%, and specific surface area is less than 3 m2/g, when it is used as a negative electrode material of a lithium secondary battery. SOLUTION: This carbon material is formed by impregnating a graphite-based material acting as a core material in organic compound at 10-300 deg.C, separating it from the organic compound, adding organic solvent to this separated carbon material, cleaning and treating them at 10-300 deg.C, carbonizing them, crushing and/or classifying them, and adjusting their grain sizes. The surface of particles comprising the carbon particles or carbon particles aggregate is covered by low crystalline carbon, plane spacing (d002) of a plane (002) in an X-ray wide-angle diffraction method is d002<=0.337(nm), and in ESR spectrum measured at cryogenic temperature below 10 K, line width of at least one peak of peaks belonging to carbon and appearing at 3200-3400 gauss is not less than 100 gauss. |
