Negative electrode active material having high output characteristics and lithium secondary battery including the same

A negative electrode active material comprising:

• lithium titanium oxide particles,
• wherein the lithium titanium oxide particles have an average particle diameter (D50) of 0.5-9 μm, a specific surface area of 3-7 m2/g, and a pellet density of 1.7 g/cc or more under a pressure of 64 MPa, and the lithium titanium oxide is represented by the following Chemical Formula 1,
• wherein the lithium titanium oxide particles are a mixture of primary particles with secondary particles, and a weight ratio of the primary particles to the secondary particles is between 1:9 and 4:6:
• [Chemical Formula 1]
• LixTiyOzMw
• Wherein M is any one selected from the group consisting of Zr, B, Sn, S, Be, Ge and Zn, or a combination of two or more of them, 0.5≤x≤5, 1≤y≤5, 2≤z≤12, and 0≤w<0.1.