| abstract |
(57) [Abstract] [Purpose] In a lithium secondary battery, the output energy density and the discharge capacity per unit volume are increased to improve the charge / discharge cycle characteristics. [Structure] Acceleration energy of 5 to 5 for 1 g of carbon material Lithium ion 1 × 10 −6 to 1 × 10 −3 g at 00 keV Is injected to obtain a carbon electrode suitable as a negative electrode for a lithium secondary battery. When lithium ions are injected, a carbon electrode in which lithium ions have a peak distribution inside the carbon material is obtained. As the carbon material, a carbon material having a graphite crystalline portion and an amorphous portion can be used. Carbon materials include petroleum or coal pitch, aromatic resins, mesocarbon micro beads, carbonaceous particles composed of quinoline insoluble matter, It is obtained by firing at about 500 to 3000 ° C. |