NEGATIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY, METHOD OF PRODUCING THE SAME, AND NEGATIVE ELECTRODE FOR SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

A negative electrode active material for a secondary battery including: natural graphite particles; and a carbon coating layer on a surface and in an inside of the natural graphite particles. The negative electrode active material for a secondary battery has a porosity of 3% to 13%.