| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery negative electrode material and its manufacturing method in which charge and discharge capacity is large, and battery performance having excellent cycle characteristics is equipped. SOLUTION: Lithium secondary battery negative electrode material is made of carbon material in which its carbon fiber surface is coated by the carbide of thermosetting resin, a lattice spacing (d002 ) value by X-ray diffraction is d002 <0.343nm at a carbon fiber portion, d002 <0.340nm at a resin carbonized portion, and weight ratios of carbon fiber and resin carbide are 1:0.5 to 2. Solution prepared by dissolving the thermosetting resin in organic solvent is impregnated into a carbon fiber sheet, is cured so as to coat the carbon fiber surface by the thermosetting resin, and the same is carbonized in temperatures from 2,000 to 3,000 deg.C in a non-oxidizing atmosphere so as to manufacture the negative electrode material. |
