LITHIUM ION SECONDARY BATTERY

摘要

The present invention relates to a negative electrode for a lithium ion secondary battery, characterized in containing a negative electrode active material containing a first carbon and a second carbon, the first carbon begin spherical graphite, and the second carbon being bulk graphite. The sulfur concentration (Sx) in the first carbon and the sulfur concentration (Sy) in the second carbon are respectively in a range of 0 ppm to 300 ppm.