| abstract |
i) a silicon oxide composite comprising Si, ii) a silicon oxide represented by SiO x (0<x≤2), and iii) a magnesium silicate containing Si and Mg; and It is located on the surface of the silicon oxide composite and includes a carbon coating layer comprising a carbon-based material, During X-ray diffraction analysis, peaks due to Mg 2 SiO 4 and MgSiO 3 are simultaneously displayed, and peaks due to MgO are not observed, Had a ratio I (Mg 2 SiO 4) / I (MgSiO 3) of the peak intensity I (Mg 2 SiO 4) and the peak intensity I (MgSiO 3) attributable to MgSiO 3 attributable to the Mg 2 SiO 4 is less than 1 , At this time, the peak attributed to the Mg 2 SiO 4 is observed at 2θ = 32.2 ± 0.2˚, the peak attributed to the MgSiO 3 is observed at 2θ = 30.9 ± 0.2˚, Provided are a negative active material having a moisture content of less than 200 ppm when measuring moisture content at 250° C. by a Karl Fisher method, a method for preparing the same, and an anode including the same. |