This invention provides a novel dry-process
electrolyte membrane, its preparation method, and its application, belonging to the field of
solid-state battery technology. The
electrolyte membrane is prepared by a dry film-forming process after combining a highly elastic and viscous
halide with a
solid electrolyte; the highly elastic and viscous
halide includes Li3McXb6, derivatives of Li3McXb6, and Li... x Md y N 1‑ y Cl q and Li x Md y N 1‑y Cl q The electrolyte membrane comprises at least one of the following derivatives: Mc, In, Al, Ti, Y, Dy, Gd, Ge, Sc, Zr, and Yb; and Md comprises at least one of In, Y, Al, Zr, Sc, and Ge. This electrolyte membrane exhibits low
porosity and high tensile strength, with a more compact internal structure, reducing internal defects in the battery. The increased tensile strength suppresses
lithium dendrite penetration, preventing internal short circuits and thus achieving superior battery cycle performance.