Method for preparing lithium sulfide from lithium sulfate

A lithium sulfate and lithium sulfide technology, applied in chemical instruments and methods, lithium compounds, inorganic chemistry, etc., can solve the problems of cumbersome preparation methods and high prices of lithium sulfide, and achieve the effects of easy control of the reaction, simple steps and low reaction temperature.

Active Publication Date: 2021-03-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing lithium sulfide preparation methods which are tedious and expensive, and provide a new method for the synthesis and preparation of lithium sulfide which meets the requirements of scientific research with high efficiency and low cost.

Method used

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  • Method for preparing lithium sulfide from lithium sulfate

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Experimental program
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Effect test

Embodiment 1

[0026] Under the protection of argon atmosphere, weigh lithium hydride and lithium sulfate in a molar ratio of 8:1, pour them into an agate mortar and mix thoroughly, then transfer them to the reactor and heat to 500°C at a heating rate of 2°C / min. , keep the temperature for 2h, cool down to room temperature after the reaction is completed, extract the gas in the reactor and reach a vacuum state, transfer it to an argon protective atmosphere, open the reactor, and take out the powder to obtain a powder containing lithium sulfide. Then, the above powder is dissolved with absolute ethanol, and the filtrate is heated at 50°C for 10 h after suction filtration to evaporate, and then the lithium sulfide powder can be obtained. figure 1 According to its corresponding X-ray diffraction pattern, the obtained product is a single phase of lithium sulfide.

Embodiment 2

[0028] Under the protection of argon atmosphere, weigh lithium hydride and lithium sulfate in a molar ratio of 8:2, pour them into an agate mortar and mix thoroughly, then transfer them to the reactor and heat to 200°C at a heating rate of 1°C / min. , keep the temperature for 100h, cool down to room temperature after the reaction is completed, extract the gas in the reactor and reach a vacuum state, transfer it to an argon protective atmosphere, open the reactor, and take out the powder to obtain a powder containing lithium sulfide. Then, the above powder was dissolved in absolute ethanol, and after suction filtration, the filtrate was heated at 80° C. for 1 h to evaporate, and then the lithium sulfide powder was obtained.

Embodiment 3

[0030] Under the protection of helium atmosphere, weigh lithium hydride and lithium sulfate in a molar ratio of 8:0.5, pour them into an agate mortar and mix thoroughly, then transfer them to the reactor and heat to 800°C at a heating rate of 5°C / min. , kept for 1 h, cooled to room temperature after the reaction, pumped out the gas in the reactor and reached a vacuum state, transferred it to a helium protective atmosphere, opened the reactor, and took out the powder to obtain a powder containing lithium sulfide. Then, the above powder was dissolved in absolute ethanol, and after suction filtration, the filtrate was heated at 60° C. for 5 h to evaporate, and then the lithium sulfide powder was obtained.

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Abstract

The invention belongs to the technical field of material synthesis, and particularly relates to a method for preparing lithium sulfide from lithium sulfate. Aiming at the common defects of high price,difficulty in purity guarantee and the like of commercial lithium sulfide, the invention discloses a method for preparing high-purity lithium sulfide by using a simple heating method, lithium hydrideand lithium sulfate are used as raw materials, the lithium sulfide powder can be obtained through simple processes of heating, heat preservation, purification and the like, the method is simple and rapid, and the lithium sulfide with relatively high purity can be prepared at low cost.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing lithium sulfide by utilizing lithium sulfate. Background technique [0002] As a promising energy storage system, lithium-sulfur batteries have been highly valued by researchers. The elemental sulfur in traditional lithium-sulfur battery cathode materials is being used by emerging cathode materials due to its shortcomings such as high volume effect and low conductivity. replaced. The lithium sulfide cathode has ideal prelithiation properties and high theoretical specific capacity (1166 mA h g -1 ), is expected to become a new generation of lithium-sulfur battery cathode materials. Because lithium sulfide is in a fully lithiated state (unlike elemental sulfur), non-lithium metal anode materials (such as silicon or tin) can be used to avoid the formation of lithium metal dendrites and other safety issues. In addition to its compatibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M4/58H01M10/0525
CPCC01D15/00H01M4/5815H01M10/0525H01M2004/028C01P2002/72C01P2006/40C01P2006/80Y02E60/10
Inventor 梁初胡梦茹王凯黄辉张文魁甘永平张俊夏阳
Owner ZHEJIANG UNIV OF TECH
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