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Lithium metal alloy and preparation method and application thereof

A lithium metal and alloy technology, applied in the field of lithium metal alloy and its preparation, can solve problems such as retention, limited industrial application, and inability to produce large-scale production, and achieves easy operation, stable circulation, excellent lithium ion transmission capacity and mechanical performance effect

Active Publication Date: 2019-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method only stays in the experimental stage and cannot be mass-produced, which limits its industrial application.

Method used

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  • Lithium metal alloy and preparation method and application thereof
  • Lithium metal alloy and preparation method and application thereof
  • Lithium metal alloy and preparation method and application thereof

Examples

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preparation example Construction

[0036] The preparation method of metal lithium alloy provided by the invention comprises the following steps:

[0037] 1) Extracting alkali metal salt solids from lithium ore leachate or purified lithium brine;

[0038] Wherein, the alkali metal salt solids include lithium salt solids, sodium salt solids, potassium salt solids, rubidium salt solids and cesium salt solids;

[0039] 2) heating the alkali metal salt solid obtained in step 1) under an inert gas until it completely melts;

[0040] 3) Melting and electrolyzing the melted alkali metal salt solid under inert gas for 1-10 hours to obtain metal lithium alloy;

[0041] Among them, the electrolytic current density is 1 ~ 50mA / cm 2 , The electrolysis temperature is 400 ~ 850 ℃.

[0042] The concentration ratio of lithium / magnesium and lithium to boron in the purified lithium brine or lithium ore leaching solution in step 1) is greater than 1, and the alkali metal content is greater than 10 mg / L.

[0043] The preparatio...

Embodiment 1

[0047] Add a sufficient amount of 5mol / L HTFSI solution and 3mol / L (t-BAMBP) solvent to the concentrated brine of Qinghai Xitaijinel Salt Lake after purification as 1,3-dioxolane (DOL), and separate the liquids to obtain Add 3mol / L hydrochloric acid to the organic solution containing LiTFSI and other alkali metal salts, and back-extract the alkali metals to obtain the corresponding alkali metal chloride salt solution, and evaporate the water to obtain the corresponding alkali metal chloride salt solid.

[0048] Mix the above alkali metal salt chloride solids evenly, add them into the electrolytic cell, and heat until the solids are completely melted. The temperature of the electrolytic cell is constant at 400°C, the cathode potential is controlled at -4.1V, and the constant DC current density is 50mA / cm 2 The electrolysis was carried out for 10 hours at low temperature, and lithium, sodium, potassium, rubidium and cesium were collected. Cool to obtain the lithium alloy, cast ...

Embodiment 2

[0051] Take 5L of a certain lepidolite leach solution after purification, add a sufficient amount of 6mol / L HClO 4 Solution, and the s-BAMBP of 1mol / L, the solvent is ethylene glycol dimethyl ether (DME), carry out 5 stages of countercurrent extraction. LiClO-containing 4 and other organic solutions of alkali metal salts, and then add 8 mol / L hydrochloric acid to obtain an alkali metal chloride salt solution, evaporate water, and dry to obtain lithium, sodium, potassium, rubidium, and cesium chloride solids.

[0052] Mix the above alkali metal salts evenly, add them into the electrolytic cell, and heat until the solids are completely melted. The whole system is in an argon atmosphere. Stabilize the above electrolyte to 850°C, the cathode potential is constant at -3.5V, at a constant DC current of 1mA / cm 2 electrolysis for 1 h. Lithium, sodium, potassium, rubidium, and cesium were collected, cooled to obtain a lithium alloy with a purity of 98.4%, and the obtained lithium a...

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Abstract

The invention provides a lithium metal alloy and a preparation method and an application thereof. The method comprises steps that alkali metal salt solid is extracted from lithium ore lixivium or purified lithium brine; the alkali metal salt solid is heated under inert gas till the alkali metal salt solid is completely melted; the melted alkali metal salt solid is melt-electrolyzed under inert gas for 1-10 hours to obtain the metal lithium alloy. The method is advantaged in that the method is simple in process, easy to operate and can realize comprehensive utilization of resources. The prepared lithium alloy has good electrochemical stability, excellent lithium ion transport capacity and mechanical properties and can be applied to metal lithium batteries to improve coulombic efficiency, specific capacity and cycle stability of the batteries.

Description

technical field [0001] The invention relates to the field of metallurgical physics and chemistry, in particular to a metal lithium alloy and its preparation method and application. Background technique [0002] With the development of the times, traditional lithium-ion batteries are limited by their theoretical capacity and energy density, and cannot meet the needs of emerging high-energy-density energy storage devices. On the one hand, metal lithium has a very high theoretical specific capacity (3860mAh / g), the lowest redox potential (-3.04V vs SHE), and its theoretical specific capacity is about 10 times that of traditional graphite materials. Especially in terms of providing power for electric vehicles, lithium metal batteries show obvious advantages in endurance. Lithium, on the other hand, is an important rare element and is known as an "energy metal". Lithium metal and its compounds have been widely used in the fields of electronics, metallurgy, chemical industry, me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/40H01M4/62H01M4/134H01M10/0525C22B3/40C22B26/12C22C24/00C25C3/02
CPCC22B26/12C22C24/00C25C3/02C22B3/409H01M4/134H01M4/362H01M4/405H01M4/628H01M10/0525H01M2004/027Y02E60/10Y02P10/20
Inventor 颜果春柳天成王接喜李新海胡启阳谭磊王志兴郭华军彭文杰
Owner CENT SOUTH UNIV
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