| 摘要 |
PURPOSE: To provide a battery having high voltage, high capacity and excellent charge-discharge cycle service life characteristics by manufacturing a negative electrode by integrating hardly graphitizable carbon and easily graphitizable carbon. CONSTITUTION: Phenol formaldehyde resin is carbonized in nitrogen, and is formed as hardly graphitizable carbon, and afterward, after a surface of this resin carbon is covered with melting-conditioned pitch coke being easily graphitizable carbon, heat treatment is performed. A fluororesin type binder is mixed in this carbon material, and they are formed in a paste shape, and this paste is applied to both surfaces of copper foil, and it is rolled after drying, and a negative electrode 4b is obtained. A positive electrode lead 5 and a negative electrode lead 6 are installed on respective positive electrode 4a and negative electrode 4b, and are wound in a spiral shape through a separator 4c, and are housed in a battery case 1. |
