Molybdenum dioxide, titanium dioxide and nitrogen-doped carbon nano composite material and preparation method of negative electrode of lithium ion battery

The invention relates to a preparation method of a molybdenum dioxide, titanium dioxide and nitrogen-doped carbon nano composite material and a lithium ion battery negative electrode thereof in the technical field of lithium ion battery materials, polystyrene spheres are used as a template, absolute ethyl alcohol is used as a solvent, tetrabutyl titanate is used as a titanium source, and the molybdenum dioxide, titanium dioxide and nitrogen-doped carbon nano composite material is prepared in the presence of acetonitrile and ammonia water. Stirring and reacting to prepare PS-coated TiO2 nanospheres with core-shell structures, and then calcining under the protection of nitrogen to obtain hollow TiO2 nanospheres; the preparation method comprises the following steps: preparing hollow TiO2 nanospheres, dispersing the hollow TiO2 nanospheres in deionized water, and encapsulating molybdenum dioxide nanoparticles in the hollow TiO2 nanospheres by taking ammonium molybdate tetrahydrate as a molybdenum source in the pr