ANODE FOR SODIUM SECONDARY BATTERY, AND SODIUM SECONDARY BATTERY COMPRISING SAME

The present invention relates to a negative electrode for a sodium secondary battery including a current collector; a lower negative electrode active material layer disposed on the current collector; and an upper negative electrode active material layer disposed on the lower negative electrode active material layer, wherein the lower negative electrode active material layer includes a first negative electrode active material particle and a second negative electrode active material particle, the upper negative electrode active material layer includes a third negative electrode active material particle and a fourth negative electrode active material particle, each of the first negative electrode active material particle to the fourth negative electrode active material particle includes hard carbon, an average particle diameter (D50) of the first negative electrode active material particle is larger than an average particle diameter (D50) of the second negative electrode active material particle, an average particle diameter (D50) of the third negative electrode active material particle is larger than an average particle diameter (D50) of the fourth negative electrode active material particle, a weight of the first negative electrode active material particle is greater than a weight of the second negative electrode active material particle, and a weight of the third negative electrode active material particle is less than a weight of the fourth negative electrode active material particle.