NEGATIVE ELECTRODE CARBON MATERIAL, METHOD FOR PRODUCING NEGATIVE ELECTRODE CARBON MATERIAL, NEGATIVE ELECTRODE FOR LITHIUM SECONDARY CELL, AND LITHIUM SECONDARY CELL

摘要

In order to provide a negative electrode carbon material capable of providing a lithium secondary battery improved in the capacity and the rate characteristic, there are carried out a first heat treatment of subjecting graphite particles to a heat treatment in an oxidizing atmosphere, and following the first heat treatment, a second heat treatment of subjecting the resulting graphite particles to a heat treatment in an inert gas atmosphere at a higher temperature than in the first heat treatment.