Separable and recyclable sulfide-type solid electrolyte and its application

Abstract

The invention relates to a separable and recoverable sulfide-type solid electrolyte and its application. The sulfide-type solid electrolyte is a P-free Sn-based sulfide with a general formula of Li a sn b A c S d Wherein A is an element for doping and replacing Sn, at least one selected from As, Sb, Bi, Si, W, Mo, and 0<a≤4, 0≤b≤1, 0≤c≤0.3, d=4; the sulfide-type solid electrolyte is dissolved in water, and the sulfide-type solid electrolyte after absorbing water is heat-treated, and the material crystal structure after heat treatment is the same as the material crystal structure of the original sulfide-type solid electrolyte Similarly, the decrease of ionic conductivity is less than 5%; the temperature of the heat treatment is 150°C-700°C.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a separable and recoverable sulfide-type solid electrolyte and its application. Background technique [0002] As a key technology to achieve high safety and high energy density batteries, all-solid-state batteries have attracted extensive attention from academia and industry. All-solid-state batteries use solid-state electrolytes with high thermal stability, density, and mechanical strength as ionic conductors to replace organic electrolytes and separators used in liquid lithium-ion batteries, which can effectively solve the flammability of organic electrolytes and the penetration of negative lithium dendrites. The diaphragm causes problems such as short circuit, which greatly improves the safety of the battery. In recent years, with the emergence of ultrafast solid-state ionic conductors, the long-range migration and transportation of lithium ions in the electrolyte is no lon...

AI Technical Summary

Problems solved by technology

[0005] In short, the extremely poor air stability of sulfide solid-state electrolytes affects the production, storage, and transportation of sulfide solid-state electrolyte materials, and the production and use of sulfide all-solid-state batteries.

The above-mentioned links need to be isolated from water and oxygen, and are carried out in a vacuum environment and an inert gas atmosphere, which severely limits the production of sulfide solid electrolytes, increases the difficulty of preparation and processing, and limits their large-scale application in all-solid-state lithium batteries. , Increase the cost of production and processing

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