Preparation method of mesoporous silicon-carbon composite material, mesoporous silicon-carbon composite material and application of mesoporous silicon-carbon composite material

The invention discloses a preparation method of a mesoporous silicon-carbon composite material, the mesoporous silicon-carbon composite material and application of the mesoporous silicon-carbon composite material, and the preparation method of the mesoporous silicon-carbon composite material comprises the following operation steps: S11) uniformly mixing a silicon dioxide molecular sieve, an active agent and organic carbonate, adding the mixture into a resin solution, and uniformly dispersing to obtain a mixed solution; s12) performing spray drying on the mixed solution, pre-carbonizing at the temperature of 500-700 DEG C for at least 5 hours, preferably 6-24 hours, and performing acid pickling to obtain a pre-carbonized intermediate material; and S13) transferring the pre-carbonized intermediate material into carbonization equipment, introducing carbon dioxide active gas with the flow range of 500-2000 SCCM into the carbonization equipment, and carbonizing for 1-6 hours at the temperature of 800-1200 DEG C to