NEGATIVE ACTIVE MATERIAL, METHOD FOR PREPARING THE SAME, AND RELATED SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND APPARATUS

The present application discloses a negative active material, a method for preparing the same, and related secondary batteries, battery modules, battery packs and apparatus. The negative active material includes a core material and a polymer-modified coating layer on at least a part of its surface; the core material includes one or more of silicon-based materials and tin-based materials; the coating layer includes sulfur element and carbon element; in the Raman spectrum of the negative active material, the negative active material has scattering peaks at the Raman shifts of 900 cm˜960 cm, 1300 cm˜1380 cmand 1520 cm˜1590 cm, respectively, in which the scattering peak at the Raman shift of 900 cm˜960 cmhas a peak intensity recorded as I, the scattering peak at the Raman shift of 1520 cm˜1590 cmhas a peak intensity recorded as I, and Iand IG satisfy 0.2≤I/I≤0.8.