| 摘要 |
PROBLEM TO BE SOLVED: To improve the charge and discharge efficiency of a battery by forming a battery negative electrode material by use of a carbon material containing 0.1-5.0wt.%, calculated in terms of element, of at least one of alkali metal, alkali earth metal and phosphor. SOLUTION: To 99 parts by weight of a resol resin, 1 parts by weight of potassium hydroxide and 8 parts by weight of pure water are mixed, and the resulting mixture is heated at 500 deg.C for 5 hours and carbonized. The carbide is pulverized, and a part of it is heated to a reaching temperature in a prescribed nitrogen flow together with an alumina-made crucible, and baked with holding this temperature for 1 hour to further carbonize it. This carbonaceous material contains 0.1-5.0wt.%, calculated in terms of element, of at least one of alkali metal, alkali earth metal and phosphor. Thus, a charging capacity of the theoretical capacity of graphite or more can be realized. |
