| 摘要 |
PURPOSE:To improve the cycle lifetime characteristic by providing a plate, to which the spheroidal carbon particulate having the ramellar structure is added, in the active material. CONSTITUTION:A plate, to which the spheroidal carbon particulate having the ramellar structure is added, is provided in the active material. Since the surface area of the spheroidal carbon particulate having the ramellar structure is smaller than that of conventional graphite because of the spherical form thereof, the generation of Co2 to be caused in the amorphous part is reduced, and peeling of layer is reduced. Especially, since layer-to-layer spacing of the spheroidal carbon particulate heat-processed under 1000-1500 deg.C is more randam in comparison with the one heat-processed under more than 2000 deg.C and perfectly graphitized, peeling of layer is further hard to be generated. Furthermore, since the distribution is good because of the spherical form with the even particulates, the utilization factor and the cycle lifetime characteristic can be improved with a little quantity of addition. |
