Preparation method of nano-silicon composite negative electrode material packaged by porous titanium-based metal organic framework

The invention discloses a preparation method of a porous titanium-based metal organic framework encapsulated nano silicon composite negative electrode material, which comprises the following steps: preparing titanium-based metal organic framework powder, and carrying out solvothermal reaction on an organic ligand and a metal titanium organic matter to generate a titanium-based metal organic bone powder; the method comprises the following steps: adding titanium-based metal organic framework powder into mixed gas containing silicon source gas, and carrying out pyrolytic deposition to obtain an intermediate product TOSi; and adding the intermediate product TOSi into a carbon source gas, and carrying out carbon carbide wrapping on the intermediate product TOSi through a chemical deposition method to obtain the porous titanium-based metal organic framework packaged nano silicon composite negative electrode material C (at) TOSi coated with a carbon layer on the surface. The expansion of the silicon-based negative e