Preparation method of sulfide solid electrolyte material

Abstract

The invention provides a preparation method of a sulfide solid electrolyte material. The preparation method comprises the following steps: sulfide lithium ion conductor electrolyte powder, an adhesive and a solvent are mixed, and electrolyte slurry is obtained; the electrolyte slurry is uniformly stirred and dispersed, and uniform electrolyte slurry is obtained; the uniform electrolyte slurry is uniformly coated on a PET film, the electrolyte slurry which is coated on the PET film is dried at a set drying temperature, in order to evaporate the solvent part, and an electrolyte film is obtained; the electrolyte film is taken from the PET film, and the electrolyte film is cut according to a certain specification; the adhesive and the residual solvent in the cut electrolyte film are discharged, and a compact sulfide lithium ion conductor electrolyte sheet is obtained. The preparation method of the sulfide solid electrolyte material can effectively solve the problem that when an electrolyte sheet is prepared according to the prior preparation method of the all solid state electrolyte sheet, the electrolyte sheet which is thicker influences electrical performance of an all solid state battery.

Description

technical field [0001] The invention relates to the technical field of sulfide solid electrolyte materials, in particular to a preparation method of a sulfide solid electrolyte material. Background technique [0002] Because lithium secondary batteries have many advantages such as large output power, high energy density, long service life, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance and no environmental pollution, it has become It is the first choice of rechargeable power source for portable electronic products today, and it is also considered to be the most competitive vehicle power battery. Therefore, at present, lithium secondary batteries have entered thousands of households and become an inseparable part of society. In general, lithium secondary batteries mainly include liquid lithium secondary batteries and solid lithium secondary batteries. Among solid-state lithium secondary batteries, ...

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a method for preparing a sulfide solid electrolyte material, so as to solve the problem that the thickness of the electrolyte sheet is relatively thick in the preparation method of the existing all-solid electrolyte sheet, which will affect the performance of the all-solid electrolyte sheet. The problem of the electrical performance of the battery

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