Preparation method of oxide solid electrolyte diaphragm

Abstract

The invention relates to a preparation method of an oxide solid electrolyte diaphragm, belonging to the fields of electro chemical engineering and ceramic industry. The method comprises the following steps: by using lithium carbonate or lithium hydroxide as a lithium source, putting previously prepared solid electrolyte powder in a crucible, and directly sintering at high temperature to obtain a compact block; and carrying out cutting and sanding on the block to obtain the solid electrolyte diaphragm sheet. The method avoids the complex mold preforming process in the conventional method; and the mechanical energy is converted into the surface free energy of the powder granules by ball milling, the excessive low-melting-point lithium salt is molten at high temperature to generate the liquid phase which is covered on the powder particle surfaces, and the powder automatic aggregates under the action of surface tension, so that the surface free energy is lowered, thereby forming the compact solid electrolyte block. The method has the advantages of simple technique, smooth and compact finished product and the like, can easily implement large-scale production, and is especially suitable for preparing oxide solid electrolyte diaphragms in the solid secondary battery.

Description

technical field [0001] The invention relates to a preparation method of an oxide 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. Although inorganic solid electrolytes are difficult to produce on a large scale, they have high ionic conductivity, good selectivity, and long service life, and have become the mainstream of rese...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of pre-pressing the diaphragm before sintering in the traditional solid-state method, easy deformation during the sintering process, and easy damage in the post-processing, etc., and provide a high ionic conductivity with simple process, flat and compact finished product, and easy scale-up Preparation method of oxide solid electrolyte separator

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