Solid-state battery and in-situ polymerization preparation method thereof

The invention relates to the field of batteries, in particular to an in-situ polymerization preparation method of a solid-state battery, which comprises the following steps: injecting electrolyte into a battery shell containing a battery cell, and then packaging for in-situ polymerization; the battery cell comprises a positive plate, a diaphragm and a negative plate which are compounded in sequence; the diaphragm comprises a base membrane and a modified layer prefabricated on the surface of the base membrane; the modified layer comprises a modifier A, a modifier B and a binder; wherein the modifying agent A is prepared from at least one of LiPF6, LiBF4, LiBOB and LiClO4, and the modifying agent B is prepared from at least one of LiPF6, LiBF4, LiBOB and LiClO4; the modifier B is prepared from at least one of AlF3, SbF5, LiCl and LiBr; the weight ratio of the modifier A to the modifier B is (0.05-5): 1; the electrolyte comprises a basic electrolyte and an olefinic bond-containing polymeric monomer dissolved in