Preparation method of lithium lanthanum niobium oxygen solid electrolyte diaphragm

Abstract

The invention relates to a preparation method of a lithium lanthanum niobium oxygen solid electrolyte diaphragm, and belongs to the field of electrochemical engineering and ceramic industry. The method comprises the following steps that lithium carbonate, acetic acid and lithium hydroxide are taken as lithium sources, the mixed material powder is sintered in advance to form lithium lanthanum niobium oxygen solid electrolyte powder, then a powder body is placed in a crucible, is compacted by vibration, and is then directly sintered at high temperature to obtain a compact block body; and the block body is cut and grinded to obtain a lithium lanthanum niobium oxygen solid electrolyte diaphragm sheet. The method avoids the complicated mold tableting process in the traditional method, does no need a high-tension apparatus, and does not need the addition of a sintering assistant either; and the powder body is aggregated to form the compact block body by utilizing the surface tension of a liquid phase generated through melting of the lithium salt at high temperature. The preparation method has the advantages of simple process, smoothness and compactness of a product, easy large-scale production and the like, and is particularly suitable for the preparation of the lithium lanthanum niobium oxygen solid electrolyte diaphragm in a solid state battery.

Description

technical field [0001] The invention relates to a preparation method of a lithium lanthanum niobium oxygen solid electrolyte diaphragm, which belongs to the fields of electrochemical engineering and ceramic industry. Background technique [0002] Due to the use of organic electrolytes in traditional lithium-ion batteries, there are potential dangers such as combustion and explosion. The new generation of lithium-ion batteries, the so-called "all-solid-state batteries", uses solid electrolytes instead of flammable organic electrolytes, which fundamentally solves the safety problem of batteries. Solid electrolytes can be broadly classified into polymers and inorganic substances. High molecular polymers have low ionic conductivity at room temperature, making it difficult to apply in all-solid-state batteries. However, although inorganic solid electrolytes are difficult to produce large-scale membranes. [0003] There are many kinds of inorganic solid electrolytes, and the cu...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex and cumbersome process, time-consuming and labor-intensive, and easy contamination of samples when preparing lithium-lanthanum-niobium-oxygen solid electrolyte diaphragms by traditional methods, and to provide a preparation method for lithium-lanthanum-niobium-oxygen solid electrolyte diaphragms

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