Method for preparing lithium metal through low-temperature melting electrolysis

Abstract

The invention provides a method for preparing lithium metal through low-temperature melting electrolysis. According to the method, the temperature of molten salt (from 450 DEG C to 350 DEG C or below)can be can greatly lowered, the corrosion of chlorine to device materials can be reduced, and therefore the lithium metal is efficiently prepared. The method for preparing the metal lithium through electrolysis comprises the steps that a mixture of LiX (X=Cl, Br and I) and LiOH is heated to be in a 350-DEG C molten state, low-melting-point Li2 (OH) nX2-n is prepared, Li2 (OH) nX2-n serves as an electrolysis raw material, and the metal lithium is prepared through electrolysis in a molten salt state.

Description

technical field [0001] The invention relates to a method for preparing metal lithium by electrolysis of molten salt at a lower temperature. Background technique [0002] Lithium metal is the lightest metal in nature, with small atomic weight and low redox potential. Lithium battery is the most widely used energy storage device in the energy field. Lithium alloys and salts are also widely used in the preparation of glass ceramics and aerospace high-strength materials. [0003] In the past two decades, lithium-ion batteries have been widely used in energy storage devices for mobile electronics. In recent years, with the gradual popularization of electric vehicles powered by lithium-ion batteries, the global demand for lithium-containing cathode materials has grown rapidly. Driven by the continuous growth of demand for upstream metal lithium. So far, the industrial production of metal lithium has adopted the method of producing metal lithium by electrolysis of a melt electrol...

AI Technical Summary

Problems solved by technology

LiOH or Li is generally used in industry 2 CO 3 As a raw material, react with HCl to prepare anhydrous LiCl, and then add anhydrous KCl in proportion to electrolysis. At present, the main problems of this molten electrolysis method are: (1) maintaining a high temperature of 450 degrees Celsius requires a large amount of energy consumption; (2) under high temperature The chlorine gas that generates is more serious to the corrosion of reaction device, and is big to environmental pollution, must be collected and processed; (3) the preparation cost of anhydrous LiCl and anhydrous KCl raw material is higher, causes overall production cost higher

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