AMORPHOUS CARBON MATERIAL AND GRAPHITE CARBON MATERIAL FOR NEGATIVE ELECTRODES OF LITHIUM ION SECONDARY BATTERIES, LITHIUM ION SECONDARY BATTERY USING SAME, AND METHOD FOR PRODUCING CARBON MATERIAL FOR NEGATIVE ELECTRODES OF LITHIUM ION SECONDARY BATTERIES

摘要

This amorphous carbon material is used as a material for a negative electrode of a lithium-ion secondary battery. The material has a circularity of 0.7 to 0.9, both inclusive, a mean particle size of 1 µm to 30 µm, both inclusive, and a total content of transition metals of 700 ppm to 2500 ppm, both inclusive.