Solid electrolyte and preparation method and application thereof

The embodiment of the invention relates to a solid electrolyte and a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion batteries. The embodiment of the invention aims to solve the technical problem of low battery performance caused by zinc metal negative electrode dendritic crystal, hydrogen evolution, corrosion and positive electrode material dissolution caused by aqueous electrolyte in the practical application of the existing zinc ion battery. The preparation method of the solid electrolyte provided by the embodiment of the invention comprises the following steps: mixing natural inorganic mineral substances subjected to centrifugal impurity cleaning with a zinc salt electrolyte for ion exchange, and drying to obtain the solid electrolyte. The solid electrolyte provided by the embodiment of the invention has zinc ion conducting capacity, can allow reversible shuttle of zinc ions and guide uniform deposition of the zinc ions, and can inhibit dissolution of a p