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 by which a lithium secondary cell with improved capacity and rate characteristics is obtained, the following steps are performed: a first heat treatment step for heat-treating graphite particles in an oxygen atmosphere; and, after the first heat treatment step, a second heat treatment step for heat-treating the graphite particles in an inert gas atmosphere at a temperature higher than that use in the first heat treatment step.