GRAPHITE NEGATIVE ELECTRODE MATERIAL AND MANUFACTURING METHOD THEREOF, AND NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY USE AND LITHIUM SECONDARY BATTERY THAT ARE ARRANGED BY USE OF GRAPHITE NEGATIVE ELECTRODE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a graphite negative electrode material for lithium secondary battery use which is high in tap density and less in fine powder amount, a manufacturing method thereof, and a negative electrode for lithium secondary battery use and a lithium secondary battery that are arranged by use of the graphite negative electrode material.SOLUTION: A method for manufacturing a graphite negative electrode material for lithium secondary battery use comprises the steps of: using a pitch material including 20 mass% or less of quinoline insoluble as a material to perform a thermal treatment of the material; conglobating the material subjected to the thermal treatment; baking the material subjected to the conglobation; and graphitizing the material subjected to the baking according to circumstances. In the graphite negative electrode material for lithium secondary battery use, the average circularity is 0.90 or larger; the average total number of particles is 3×10/g or less; the ratio (d/d) of a 90%-particle diameter to a 10%-particle diameter in a volume-based particle size distribution is 1.5-2.8; and the minimum particle diameter (d) is 3.5 m or larger.