Process for manufacturing lithium sulfur battery

Abstract

The invention discloses a process for manufacturing a lithium sulfur battery. The process comprises the following steps: adding polyacrylonitrile resin micro powder and diatomite into a high-speed mixing stirrer according to a mass ratio of 36-39 to 64-61, adding an NMP solvent which accounts for 6-24 weight percent of the diatomite to serve as a raw material, performing pretreatment, and performing repeated dipping and high-temperature evaporation in an NMP solution of lithium salt (namely a 6-9 weight percent of NMP solution containing lithium polysulfide, lithium methylaminobutyrate, lithium perchlorate and lithium phosphate), thereby preparing a positive material; preparing all-solid-state electrolyte of the lithium sulfur battery from lithium methylaminobutyrate, lithium perchlorate and lithium phosphate; and adsorbing molten metal lithium through pores of carbon-containing diatomite at 630-660 DEG C when metal lithium and the formed carbon-containing diatomite electrode are in a vacuum electric heating furnace, thereby finishing preparation of a negative material. The all-solid-state electrolyte of the lithium sulfur battery prepared by the process has high sulfur containing capacity, high ion transport capacity and high conductive performance, and the high rate performance and high cycle performance of the lithium sulfur battery can be improved.

Description

[0001] Field [0002] The invention relates to a lithium-sulfur battery all-solid electrolyte and a preparation method thereof, belonging to the field of new energy. Background technique [0003] With the development of human society, problems such as energy shortage and environmental pollution have become increasingly prominent, and people's understanding and requirements for chemical power sources have become higher and higher, prompting people to continuously explore new energy storage systems based on chemical power sources. Lithium metal-based batteries have led the development of high-performance chemical power sources in recent decades. With the successful commercialization of lithium-ion batteries, countries around the world are stepping up research on lithium-ion power batteries for vehicles. However, due to factors such as energy density, safety, and price, conventional lithium-ion batteries such as lithium cobalt oxide, lithium manganese oxide, and lithium iron pho...

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide an all-solid-state electrolyte obtained by compounding porous carbon and sulfur in the prior art because of its limited ability to adsorb active substance sulfur and poor conductivity, which limits its application in batteries. All-solid-state electrolyte for lithium-sulfur batteries with high rate performance and high cycle performance of sulfur batteries

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