Preparation method of mesoporous carbon material with high mesoporous rate and application of mesoporous carbon material in silicon-carbon negative electrode

The invention provides a preparation method of a mesoporous carbon material with high mesoporous rate and application of the mesoporous carbon material in a silicon-carbon negative electrode. According to the invention, styrene, a (methyl) acrylic acid (ester) compound and a vinyl silane compound are used as comonomers to prepare the organic silicon modified styrene-acrylic emulsion; then uniformly mixing biomass powder, an organic silicon modified styrene-acrylic emulsion, a surfactant and a sodium hydroxide solution, drying, heating in an inert atmosphere for carbonization, cooling, washing and drying to obtain prefabricated mesoporous activated carbon, dipping the prefabricated mesoporous activated carbon in an epoxy silane coupling agent solution, taking out after dipping, drying, heating in an inert atmosphere, cooling, washing and drying to obtain the mesoporous activated carbon. The mesoporous carbon material with high mesoporous rate is obtained; and mixing the mesoporous carbon material with graphite