NEGATIVE ELECTRODE ACTIVE MATERIAL, AND NEGATIVE ELECTRODE AND SECONDARY BATTERY WHICH INCLUDE THE SAME

The present invention relates to a negative electrode active material comprising: artificial graphite particles; and sulfur (S) distributed in the artificial graphite particles, wherein the sulfur content in the negative electrode active material is 15 ppm to 40 ppm. A negative electrode and secondary battery that comprise the negative electrode active material can have both improved output characteristics and capacity characteristics, as well as improved initial efficiency.