PRODUCTION OF CARBONACEOUS MATERIAL AND BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To produce economically a carbonaceous material having high performance as a material for negative electrodes of lithium-ion secondary battery without use of a solvent of troublesome handling, such as quinoline. SOLUTION: This carbonaceous material, which is used as a material for negative electrodes of lithium-ion secondary batteries, is produced by steps of: heat-treating vacuum pitch until its quinoline-insoluble content becomes 50-85wt.% so as to form mesophase pitch; powdering the obtained mesophase pitch to fine particles having an aspect ratio of 2 or less; oxidizing the powder; and carbonizing and graphitizing the oxidized powder.