A kind of preparation method of sulfide solid-state electrolyte and all-solid-state lithium-sulfur battery

Abstract

The invention discloses a preparation method of a sulfide solid electrolyte and an all-solid lithium-sulfur battery. The invention adopts a simple and easy liquid phase synthesis method to prepare a solid electrolyte with high ion conductivity. The method is easy to operate. Compared with the traditional ball milling method, the raw materials of this method react thoroughly and have extremely high reactivity, which can Greatly improve the production efficiency of solid electrolyte. At the same time, using the liquid phase method to prepare the solid electrolyte can reduce the energy consumption of the ball milling process, thereby reducing the production cost of the solid electrolyte. In addition, the present invention also assembles the solid electrolyte prepared by the liquid phase method into an all-solid lithium-sulfur battery. Under the cycle test, better battery cycle performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a sulfide solid electrolyte and an all-solid lithium-sulfur battery. Background technique [0002] With the depletion of non-renewable energy such as fossil energy, the development of new renewable energy has become a hot spot in the current society. The invention of lithium-ion batteries in the 1990s has greatly helped to solve the energy crisis. However, the current lithium-ion batteries and There are many problems, the most important of which is that there is a flammable and explosive organic electrolyte in the system. Once leaked, it will cause damage to human life and property. Therefore, it is necessary to apply lithium-ion batteries to market commodities on a large scale. , It is imminent to solve the safety problem of batteries. In order to fundamentally solve the problem of battery safety, the electrolyte in the battery must be repl...

AI Technical Summary

Problems solved by technology

[0003] At the same time, people are increasingly pursuing the energy density of batteries. S has a very high theoretical energy density and the price of sulfur is low. Therefore, lithium-sulfur batteries have become ideal high-energy-density energy storage materials. There are also many problems in the battery, including that the positive electrode material is prone to produce polysulfides during the discharge process, and dissolves in the electrolyte, which seriously affects the Li in the battery. + The reversibility of deposition and deintercalation causes severe battery capacity attenuation. This effect is called the shuttle effect of lithium-sulfur batteries.

At the same time, the active substance sulfur is easily soluble in the organic electrolyte, resulting in poor cycle performance and serious attenuation of the battery

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