| abstract |
PROBLEM TO BE SOLVED: To produce a graphite powder for a negative electrode of a lithium ion secondary battery having a high crystallinity and a high discharge capacity from a mesophase obtained by heat treatment of tar and / or pitch. SOLUTION: The mesophase comprises carbonization, graphitization, and pulverization, and the pulverization step is performed before the carbonization step and / or Alternatively, it is performed later in a non-oxidizing atmosphere (eg, an inert gas atmosphere, under vacuum or reduced pressure). |