To provide a carbon material at a low production cost without hindering the stability of the electrolyte while restricting a specific surface area small by forming the carbon material for negative electrode out of a burned body of the mixture of at least one kind of the artificial graphite and the natural graphite and a carbon material containing a volatile component.
At least one part of the surface of a carbon material is coated with a volatile component burned material of the volatile component containing carbon material, and as the volatile component containing carbon material, an artificially coating carbon material is used, and a carbon material for negative electrode having a degree of crystallization of the burned coating body lower than that of the carbon material as a core material is obtained. Desirably, at least one kind of the artificial graphite and the natural graphite and a carbon material containing a volatile component are mixed for burning, and carbonizing burning or graphitizing burning is used so as to manufacture the carbon material for negative electrode. As a lithium secondary battery having this carbon material as a structural element, a non-aqueous lithium secondary battery or a lithium polymer secondary battery is manufactured.
KATSUURA MASAMITSU
FUJIWARA RYOICHI
FUJIWARA HIROMI
NAKAGAWA YOSHITERU
AZUHATA TOSHIO
