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A kind of preparation method of high Li content lithium alloy

A lithium alloy and content technology, which is applied in the field of preparation of high Li content lithium alloys, can solve problems such as solvent destruction, and achieve the effects of reducing energy consumption, reducing costs and low prices.

Active Publication Date: 2020-12-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Quasi-ionic liquids are a class of green solvents that have developed rapidly in recent years. They have many advantages such as new types, many types, designability, low price, wide electrochemical window, high conductivity, and simple synthesis. They are used in catalysis, organic synthesis, dissolution, The application of electrochemistry and other fields has been continuously expanded with the deepening of people's cognition; since the 21st century, a large number of documents have reported the application of electrodeposition in deep eutectic solvents to prepare metals and alloys. Metals include aluminum, iron, copper, and silver. , gallium, manganese, molybdenum, etc. Alloys include aluminum, platinum, chromium, zinc, manganese, magnesium, etc. However, due to the relatively negative deposition potential of lithium, most solvents are destroyed before the precipitation of metal lithium

Method used

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  • A kind of preparation method of high Li content lithium alloy
  • A kind of preparation method of high Li content lithium alloy
  • A kind of preparation method of high Li content lithium alloy

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] Under an argon atmosphere, mix urea powder and lithium salt powder, heat to 100°C under stirring, and continue stirring until a transparent liquid is obtained as a molten salt electrolyte; wherein the molar ratio of urea powder to lithium salt powder is 3; The lithium salt powder is lithium chloride;

[0049] The molten salt electrolyte is placed in the electrolytic cell, and under the condition of argon atmosphere, constant potential electrodeposition is carried out. The electrolytic cell is a single-chamber electrolytic cell with a structure such as image 3As shown, the single-chamber electrolytic cell body 5 is provided with a single-chamber electrolytic cell cathode plate 3, a single-chamber electrolytic cell first anode plate 2 and a reference electrode plate 10, and the single-chamber electrolytic cell cathode plate 3 is located in the single-chamber electrolytic cell In the middle part of the body 5, the first anode plate 2 and the reference electrode plate 10 o...

Embodiment 2

[0052] Method is with embodiment 1, and difference is:

[0053] (1) urea powder and lithium salt powder are mixed and heated to 80°C under stirring conditions, the molar ratio of urea powder and lithium salt powder is 5; the lithium salt powder is lithium fluoride;

[0054] (2) The material of the cathode plate is magnesium, and the material of the anode plate is platinum; the electrodeposition temperature is 80°C, the electrolysis time is 2h; the cathode potential is -0.5V;

[0055] (3) After the cathode plate is taken out, place it in ethylene carbonate, soak it at a temperature of 80°C for 3 hours, then dry it for 24 hours at a vacuum degree of ≤50Pa and a temperature of 80°C, and make a lithium alloy with a high Li content on the surface of the cathode plate , containing Li16.54% by mass percentage, and the rest is magnesium.

Embodiment 3

[0057] Method is with embodiment 1, and difference is:

[0058] (1) urea powder and lithium salt powder are mixed and heated to 120°C under stirring conditions, the molar ratio of urea powder and lithium salt powder is 2; the lithium salt powder is lithium bromide;

[0059] (2) The material of the cathode plate is copper, and the material of the anode plate is tungsten; the temperature of electrodeposition is 120°C, the electrolysis time is 0.5h; the cathode potential is -0.3V;

[0060] (3) After taking out the cathode plate, place it in ethylene carbonate, soak it for 2.5 hours at a temperature of 80°C, and then dry it for 24 hours at a vacuum degree of ≤50Pa and a temperature of 90°C to make lithium with a high Li content on the surface of the cathode plate. The alloy contains Li17.23% by mass percentage, and the rest is copper.

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Abstract

A method for preparing a high-Li-content lithium alloy, comprising the following steps: (1) mixing and stirring urea powder and lithium salt powder under the condition of an argon atmosphere to obtain a molten salt electrolyte; (2) providing the molten salt electrolyte in an electrolytic cell, and carrying out constant-potential electrolytic deposition or constant-current electrolytic deposition under the condition of the argon atmosphere; and (3) after the constant-potential electrolytic deposition or constant-current electrolytic deposition is finished, taking out a cathode plate with a lithium alloy deposited on the surface thereof, carrying out surface cleaning, and then drying to prepare a high-Li-content lithium alloy on the surface of the cathode plate. The present invention is featured with short technological process and low production temperature, and the prepared high-Li-content lithium alloy can be directly used for preparing different grades of lithium alloys.

Description

technical field [0001] The invention belongs to the technical field of low-temperature electrolytic metallurgy, and in particular relates to a preparation method of a lithium alloy with high Li content. Background technique [0002] Lithium is the lightest metal in nature. Adding metal lithium to aluminum alloy can reduce the density of the alloy, improve the elastic modulus, specific strength, specific stiffness, corrosion resistance and other advantages of the alloy, and it is widely used in the aerospace field; Magnesium-lithium alloy is the lightest metal structural material, with high specific strength, specific stiffness and excellent shock resistance, etc., and is an ideal structural material. [0003] The traditional method of producing lithium alloy is mainly the ingot metallurgy method, which is a method in which lithium and other high-purity metals are smelted under vacuum conditions according to a certain ratio, and directly cast into ingots; the lithium alloy pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C25C7/02
CPCC25C3/36C25C7/005C25C7/025
Inventor 高炳亮刘智伟刘成员李启明牛宏坤王聪
Owner NORTHEASTERN UNIV LIAONING
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