The invention provides a lithiated clay mineral PVDF-based composite
solid-state
electrolyte membrane, a preparation method and application thereof, and a quasi-
solid-state battery, and belongs to the technical field of
solid-state
lithium batteries. The preparation method comprises the following steps: mixing
lithium halide,
clay minerals and water for the first time, and carrying out
ion exchange reaction to obtain lithiated
clay minerals; mixing lithiated
clay minerals, PVDF, organic
lithium salt and an
organic solvent for the second time to obtain composite
slurry; and applying the composite
slurry to the surface of a substrate, and carrying out thermocuring to obtain the lithiated clay mineral PVDF-based composite solid
electrolyte membrane. The lithiated clay mineral is introduced into a mixed
system of PVDF and organic lithium salt, so that the
crystallinity of PVDF can be effectively reduced, an amorphous region is increased, conversion of PVDF crystals to beta-type PVDF is promoted, and the dissociation process of the lithium salt in the
electrolyte is promoted; meanwhile, the lithiated clay mineral is introduced, so that the
ionic conductivity can be obviously improved, an
electrochemical window is widened, the
mechanical property is improved, and the growth of lithium dendrites is inhibited.