Solid electrolyte interface modification film for lithium battery and preparation method thereof

Abstract

The invention relates to an interfacial modification membrane for a solid electrolyte for a lithium battery and a preparation method thereof. The interfacial modification membrane for the solid electrolyte for the lithium battery is characterized in that a layer of interfacial modification membrane is attached to one face or both faces of a solid electrolyte. The preparation method of the interfacial modification membrane comprises the following steps of: (1) selecting a fast-ionic conductor or a uniform mixture of a lithium-ion active material and water; (2) forming a target material by compressing the fast-ionic conductor or the uniform mixture, sintering the target material for 3-24 hours at the temperature of 500-1200 DEG C, and then, carrying out natural cooling with a furnace; and (3) attaching the target material to the face or the both faces of the solid electrolyte through magnetron sputtering, laser evaporation or electron beam evaporation, thereby obtaining the interfacial modification membrane for the solid electrolyte. According to the interfacial modification membrane for the solid electrolyte for the lithium battery and the preparation method thereof, as the layer of interfacial modification membrane is attached to the face / faces of the solid electrolyte playing a diaphragm role, the interfacial impedance between the solid electrolyte and an electrolytic solution and other types of electrolytes is reduced, the ion transmission capacity of an interface layer of the solid electrolyte is improved, and the discharge performance of the battery is effectively improved; and the preparation method is simple, and the large-scale production is facilitated.

Description

technical field

[0001] The invention belongs to the technical field of lithium batteries, in particular to a solid electrolyte interface modification film for lithium batteries and a preparation method thereof. Background technique

[0002] Lithium-air battery is a new type of battery, including metal lithium electrode, air electrode and solid electrolyte. As a battery with extremely high specific energy, lithium-air battery has a theoretical energy density close to that of gasoline.

[0003] At present, the structure of lithium-air batteries generally uses a solid electrolyte as a separator to separate the lithium electrode and the air electrode in the battery case into two regions, so that the lithium electrode is isolated from the air electrode. An electrolyte (lithium ion electrolyte or solid electrolyte) is added to the lithium electrode area, and an aqueous electrolyte is added to the air electrode area. The solid electrolyte blocks the transfer of water and oxygen i...

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