Patent ID: 6730135
Filing Date: 2004-05-04
Classification: C01B,C01P,H01M,Y02E,Y10T

Abstract:
A method of preparing a negative active material having no particular shape for a lithium secondary battery, comprising the steps of:dissolving a coal tar pitch or a petroleum pitch in an organic solvent to remove all organic-insoluble components therefrom and to obtain organic-soluble components; heat-treating the organic-soluble components at a temperature in the range of 400 to 450Â° C. for 4 hours or more under an inert atmosphere to thereby produce at least 50 weight percent of mesophase particles having no particular shape based on the pitch; coking the pitch including mesophase particles; carbonizing the coked pitch; pulverizing the carbonized pitch; and graphitizing the pulverized pitch.