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

摘要

PURPOSE: A negative active material for a lithium secondary battery is provided to ensure excellent thermal stability and cycle lifetime characteristic. CONSTITUTION: A negative active material for a lithium secondary battery comprises a core including silicon oxides represented by chemical formula 1: SiO_x, and a surface-treated layer which surrounds the surface of the core and includes metal oxides represented by chemical formula 2: M_yO_z. The metal of the metal oxide is included in the amount of 0.1-20 weight% based on the total weight of the negative active material for a lithium secondary battery In chemical formula 1, 0 < x < 2. In chemical formula 2, M is metal, 0 < y < 5, and 0 < z < 20.