METHOD FOR MANUFACTURING GRAPHITE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a graphite material for a lithium ion secondary battery having a low specific surface area and excellent in performance such as electrode density, initial efficiency, and load characteristics, and to provide a method for manufacturing the graphite material for the lithium ion secondary battery.SOLUTION: In graphite material for a lithium ion secondary battery, a coating layer comprising carbide is formed on surfaces of pressed graphite particles formed by pressing natural graphite globular particles and/or natural graphite massive particles. A method for manufacturing the graphite material for the lithium ion secondary battery includes: a pressing step for obtaining the pressed graphite particles by pressing the natural graphite globular particles and/or the natural graphite massive particles; and a coating step for coating the obtained pressed graphite particles with a carbon material precursor, then heating it to obtain a carbon coating.