Preparation method for silicon/graphite/solid electrolyte composite negative electrode material

The invention discloses a preparation method for a silicon/graphite/solid electrolyte composite negative electrode material. The preparation method comprises the following steps of: firstly, mixing silicon powder, graphite, a binder, a conductive agent and a solid electrolyte to prepare a dispersion liquid, and then performing spray granulation and drying; and adding asphalt for kneading, sintering at high temperature, crushing, sieving and demagnetizing to obtain the silicon/graphite/solid electrolyte composite negative electrode material. According to the material prepared by the method, a conductive network is formed by utilizing conductive agents such as carbon nanotubes, carbon nanofibers and graphene, so that the conductivity of the material is improved; a high temperature-resistantsolid electrolyte is added, the effect of partial electrolyte can be replaced, an ionic conductance medium is achieved when the electrolyte enters the active material, the use amount of the electrolyte is reduced, and when an