Negative active material for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same

摘要

The invention relates to a negative active material for a rechargeable lithium battery including silicon oxide particles represented by SiO x (where 0.5‰¤x‰¤1.5) having a concentration gradient such that the atom% concentration of silicon is decreased as a function of the depth from the surface of each particle to the center of the particle, and the atom% concentration of oxygen (O) increased.