Composite solid electrolyte membrane and method for manufacturing the same, secondary battery, and electric device

Abstract

The application provides a composite solid electrolyte membrane and a preparation method thereof, a secondary battery and an electric device. The preparation method comprises the following steps: forming a first mixed solution of a precursor solution of an oxide solid electrolyte and a pore-forming agent, and forming a porous oxide solid electrolyte membrane by using a flow casting method; dissolving a lithium salt and a tackifier in an organic solvent to obtain an ionic liquid; and infiltrating the ionic liquid into the porous oxide solid electrolyte membrane by applying pressure to obtain the composite solid electrolyte membrane. The application provides a method for efficiently and uniformly filling the porous oxide solid electrolyte membrane. The composite solid electrolyte membrane has high ion conductivity and interface contact, realizes rapid infiltration of the ionic liquid and efficient utilization of the porous oxide solid electrolyte membrane, and has high ion conductivity and interface contact. The application also provides application of the composite solid electrolyte membrane in the secondary battery, and the secondary battery has high energy density and cycle life performance.

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