Silicon-oxygen compound, preparation method thereof, and related battery module, battery pack and device

A silicon-oxygen composite having a chemical formula of SiOx, in which 0<x<2;

• sulfur element having a content of 20 ppm-600 ppm;
• and
• manganese element having a content from 5 ppm to 300 ppm,
• wherein a mass ratio of the sulfur element to the manganese element is from 1.5 to 10.0,
• wherein an X-ray diffraction pattern of the silicon-oxygen composite has:
• a first diffraction peak at a position where the diffraction angle 2θ is 26°-30°, wherein the full width at half maxima of the first diffraction peak is 0.8°-3.2°;
• a second diffraction peak at a position where the diffraction angle 2θ is 46°-50°, wherein the full width at half maxima of the second diffraction peak is 1.0°-4.2°;
• and
• a third diffraction peak at a position where the diffraction angle 2θ is 54°-58°, wherein the full width at half maxima of the third diffraction peak is 0.8°-4.5° wherein a content of the manganese element is from 5 ppm to 300 ppm.