Sulfide solid electrolyte and preparation method thereof

• Main Authors: XU NING, FU PINGPING, SONG YINGJIE, MA QIANQIAN
• Format: Patent
• Language: Chinese; English
• Published: 28.04.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention discloses a high-steady-state sulfide solid electrolyte and a preparation method thereof. The preparation method comprises the steps of firstly, carrying out sanding and high-temperaturesolid-phase reaction to obtain an oxide-modified double-compound sulfide lithium ion battery solid electrolyte, and then coating the surface of the solid electrolyte with a lithium phosphate fast ionconductor layer by a magnetron sputtering method. The preparation method has the main beneficial effects that the sulfide solid electrolyte is modified by adding the oxide, and metal ions enter crystal lattices, so that the structural stability of sulfide can be effectively improved; the surface of the sulfide solid electrolyte is coated with a layer of lithium phosphate fast ion conductor, so that the high ion diffusion coefficient of the solid electrolyte can be maintained, and the structural stability of the sulfide can be effectively improved. 本发明公开了一种高稳态硫化物固态电解质及其制备方法。包括如下步骤：首先通过砂磨和高温固相反应得到氧化物修饰型二重复合硫化物锂离子电池固态电解质