Core-shell silicon, selenium tin sulfide and carbon nanosphere structure material, preparation method of core-shell silicon, selenium tin sulfide and carbon nanosphere structure material, lithium ion battery silicon-based negative electrode and battery

The invention provides a core-shell silicon, selenium tin sulfide and carbon nanosphere structure material and a preparation method thereof, a lithium ion battery silicon-based negative electrode and a battery, tin salt is used as a raw material, 1, 3, 5-trimesic acid is used as an organic ligand, and the tin salt and silicon particles are subjected to solvothermal reaction in an organic mixed solvent to synthesize Si-Sn-Mal; by taking powdered sulfur as a vulcanizing agent and argon as protective gas, carrying out high-temperature calcination to generate a Si-coated SnS2 nano composite material; and finally, selenium powder is used as a selenylation agent. And calcining and selenizing to generate a special three-dimensional core-shell Si (at) SnS0. 5Se0. 5 (at) C nano spherical structure material. The material with the special structure provides more active sites in the charging and discharging process, the problem of volume expansion is solved, the battery has better stability, and the nano material has the