Method for synthesizing sulfide solid electrolyte

Abstract

The invention relates to a method for synthesizing a sulfide solid electrolyte. The method comprises the following steps of: weighing raw materials according to a composition proportion of a sulfide solid electrolytic tank in a dry argon atmosphere, and performing plasma ball milling in a ball milling tank, wherein the raw materials comprise pure lithium, powdered sulfur and phosphorus pentasulfide; under the protection of a dry inert atmosphere, performing heat treatment on the powder obtained after ball milling in the step 1 at the temperature of 350-550 DEG C for 1-5 hours, and performing rapid shock cooling after heat treatment; and crushing and granulating the product subjected to heat treatment in the step 2 to obtain the sulfide electrolyte. The method does not need to adopt a lithium sulfide raw material, directly uses the pure lithium and sulfur powder which are low in price as raw materials, and adopts a plasma ball milling technology, so that the pure lithium, the sulfur powder and phosphorus pentasulfide raw materials can directly form a solid electrolyte precursor; and the performance of the synthesized solid electrolyte is equivalent to that of a solid electrolyte obtained by adopting an existing method.

Description

technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a method for synthesizing a sulfide solid electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in digital products, electric vehicles, energy storage power stations and other fields. Due to the use of liquid electrolyte in traditional lithium-ion batteries, the safety problem cannot be completely solved. Solid-state batteries, including all-solid-state batteries, can effectively solve the problem of battery safety due to the use of non-flammable solid-state electrolytes. Among the developed solid electrolytes, the sulfide solid electrolytes (Li-P-S, Li-P-S-Cl, Li-Ge-P-S Li-Sn-P-S, Li-Si-P-S-Cl) are known for their high room temperature conductivity, thermal With good stability and wide electrochemical window, it has outstanding advantages in high-power and room-temperature solid-state batteries, and is a solid-state electrolyte mat...

AI Technical Summary

Problems solved by technology

The disadvantage is that the ionic conductivity of the obtained sulfide solid electrolyte is low

[0006] All of the above methods require the use of high-purity lithium sulfide raw materials. The current high price of high-purity lithium sulfide severely limits the practical application of sulfide solid electrolytes. Therefore, the low-cost method for developing synthetic sulfide solid electrolytes is to promote sulfide electrolytes and sulfide solid state The key to the practical use of batteries

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