CARBON MATERIAL FOR SECONDARY BATTERY NEGATIVE ELECTRODE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a carbon material with capacity exceeding a theoretical electric capacity of a graphite family material as a negative electrode material of a lithium ion secondary battery by decreasing irreversible capacity in the state that the initial charging capacity is held high, and increasing reversible capacity at the same time. SOLUTION: This carbon material is a carbonized baking material of a mixture of 70-95 wt.% cured product of graphitization retardant thermosetting resin and 30-5 wt/% non-cured easily graphitizable phenol resin. Capacity exceeds 500 mA.hr/g, irreversible capacity is 200 mA.hr/g or less, and reversible capacity is 370 mA.hr/g or more. This material is manufactured by mixing 70-95 wt.% cured product of graphitization retardant thermosetting resin and 30-5 wt.% non-cured easily graphitizable phenol resin and baking and carbonizing the mixture in an inert gas atmosphere.