Silicon-oxygen composite material, anode material, anode and lithium ion battery and preparation method thereof

Abstract

Providing a silicon-oxygen composite material, an anode material and a preparation method thereof. The silicon-oxygen composite material has a size D10 of in a range of 3.0 μm to 8.2 μm. In the present disclosure, by controlling the particle size D10 of the silicon-oxygen composite material to between 3.0 μm and 8.2 μm, on the one hand, the uniformity of pre-lithiation can be improved, the nano-silicon cannot be exposed on a surface of the particles, and desired improvement of initial Coulombic efficiency and good cycle stability can be obtained; on the other hand, the silicon-oxygen composite material has a suitable electron and ion conduction channels, and internal resistance of the particles is small, which improves the rate performance and cycle performance of the material.

Dependencies are inferred from the claim text.