Method for preparing high-purity lithium sulfide based on solution double decomposition method

By using a solution metathesis method to heat-treat lithium sulfide at low temperature and low pressure, complex impurities were removed, solving the problem of lithium carbonate impurities in lithium sulfide preparation. This enabled the preparation of high-purity lithium sulfide and improved electrolyte and battery performance.

CN121573645APending Publication Date: 2026-02-27XIAN JINGZHI NEW MATERIAL TECHNOLOGY CO LTD
4 Cites 1 Cited by

Patent Information

Application Number
CN202511993676.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-02-27

AI Technical Summary

Technical Problem

In existing lithium sulfide preparation processes, lithium sulfide and ethanol form a complex Li2S·EtOH, which thermally decomposes at high temperatures to generate lithium carbonate impurities, affecting electrolyte and battery performance.

Method used

High-purity lithium sulfide was prepared by heat-treating the solid product under low temperature (200-300℃) and low pressure (10-1000Pa) conditions using a solution metathesis method to break the weak interactions of lithium bonds, remove complex impurities, and prepare the product.

Benefits of technology

It effectively removes Li2S·EtOH impurities from lithium sulfide, avoids the formation of lithium carbonate impurities at high temperatures, improves the ionic conductivity of the electrolyte and battery, reduces production hazards and costs, and meets the purity requirements of high-end solid-state batteries.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a method for preparing high-purity lithium sulfide based on a solution double decomposition method, and belongs to the technical field of battery materials, and the method comprises the following steps: adding lithium chloride and sodium sulfide into ethanol, mixing, and reacting in the mixing process to generate lithium sulfide; performing solid-liquid separation on the reaction system to obtain a solid product; washing the solid product with tetrahydrofuran and drying; and continuously introducing inert gas into the heat treatment chamber to purge a solid product in the heat treatment chamber, carrying out heat treatment on the solid product under the conditions of 200-300 DEG C and 10-1000 Pa, and removing complex impurities in the solid product to obtain the high-purity lithium sulfide. Compared with the prior art, the method has the advantages that the Li2S.EtOH impurity in the lithium sulfide is removed, the lithium carbonate impurity generated by the reaction of the impurity at high temperature is reduced, and the risk of electrolyte and battery performance is further reduced.
Need to check novelty before this filing date? Find Prior Art