NEGATIVE ACTIVE MATERIAL, AND NEGATIVE ELECTRODE AND SECONDARY BATTERY COMPRISING SAME

The present invention provides a negative electrode active material including artificial graphite particle, wherein a thermal expansion coefficient measured by a specific method is in a range of 108 × 10/K to 150 × 10/K. The negative electrode active material of the present invention has excellent adhesion to an electrode, and has excellent processability and long-term cycle life characteristics accordingly, and the negative electrode including the negative electrode active material has high capacity and excellent initial efficiency.