| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve charge and discharge cycle characteristics of a high energy-density lithium secondary battery, and improve or maintain discharge rate characteristics, low-temperature discharge characteristics, and safety (heat resistance). <P>SOLUTION: The lithium secondary battery is prepared by using a negative electrode wherein active material composed of a mixture consisting of an artificial graphite particle A that has been obtained by kneading and granulating the base material made by crushing a bulk mesophase pitch, a pitch, and/or a thermosetting resin in a softened state and by making it carbonized/graphitized, and a sherical graphite particle B of which circularity is large, is fixed on the copper core material. This enables to improve the charge and discharge cycle characteristics of the high energy-density lithium secondary battery, and at the same time to provide the battery that is superior in the discharge rate characteristics, the low-temperature discharge characteristics, and safety (heat resistance). <P>COPYRIGHT: (C)2004,JPO |
