AMORPHOUS CARBON MATERIAL FOR LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE, GRAPHITIC CARBON MATERIAL, LITHIUM ION SECONDARY BATTERY ARRANGED BY USE THEREOF, AND METHOD FOR MANUFACTURING CARBON MATERIAL FOR LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE

摘要

PROBLEM TO BE SOLVED: To provide a carbon material for a lithium ion secondary battery negative electrode which achieves a high-level of an initial efficiency and high-level cycle characteristics in good balance, and can be arranged to have a high density.SOLUTION: An amorphous carbon material is used as a negative electrode material of a lithium ion secondary battery. The amorphous carbon material has a circularity of 0.7-0.9, and an average particle diameter of 1-30 μm. In the amorphous carbon material, the content of transition metal is 700-2500 ppm in total.