| abstract |
A negative active material for a secondary battery, an electrode for a secondary battery including the same, a secondary battery, and a manufacturing method thereof are disclosed. The negative active material for a secondary battery includes a core carbon material whose edge is partially or entirely coated with a carbide layer, wherein a particle size distribution (PSD) broad value ranges from 0.1 to 0.85 and, when the negative active material is pressed at a pressure of 2 tons, a pore volume rate before and after the compression is 0.2 or greater. A discharge capacity, efficiency, and capacity retention in a long-term cycle can be improved by optimizing the PSB broad value related to a particle distribution among physical properties of a carbon material-based negative active material for a secondary battery, and a pore volume rate of the negative active material before and after compression. |