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Method for preparing lithium sulfide by solid-liquid mixing and heating

A solid-liquid mixing and solid-liquid mixing technology is applied in the field of preparing lithium sulfide by using solid-liquid mixing and heating, which can solve the problems of complicated preparation process, impure products, expensive reactants and the like, and achieves simple process, few steps and low cost. Effect

Pending Publication Date: 2020-12-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods for preparing lithium sulfide generally have disadvantages such as cumbersome preparation process, complicated and harsh preparation conditions, expensive reactants or impure products, which lead to the high price of lithium sulfide in the market and limit the research speed and application of lithium sulfide.

Method used

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  • Method for preparing lithium sulfide by solid-liquid mixing and heating

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Effect test

Embodiment 1

[0026] Under an argon atmosphere, uniformly mix lithium hydroxide and carbon disulfide at a molar ratio of 1:1, transfer to a closed reactor, heat up to 300°C at a heating rate of 2°C / min, keep it warm for 5 hours, and cool down after the reaction is completed To 100°C, use a vacuum pump to pump out the gas in the reactor, transfer it to an argon protective atmosphere, open the reactor, take out the powder and pour it into absolute ethanol, fully dissolve it and filter it, and heat the filtrate to evaporate the absolute ethanol That is, lithium sulfide powder is obtained. figure 1 According to its corresponding X-ray diffraction pattern, the obtained product is lithium sulfide.

Embodiment 2

[0028] Under a mixed atmosphere of argon and helium, uniformly mix lithium hydroxide and carbon disulfide at a molar ratio of 6:1, transfer to a closed reactor, heat up to 500°C at a heating rate of 5°C / min, and keep the temperature for 1h. After the reaction is completed, the temperature is lowered to 100°C, the gas in the reactor is pumped out with a vacuum pump, and transferred to a protective atmosphere mixed with argon and helium, the reactor is opened, the powder is taken out and poured into absolute ethanol, fully dissolved and pumped out. Filtrate, heat and evaporate the filtrate to obtain lithium sulfide powder.

Embodiment 3

[0030] In a helium atmosphere, uniformly mix lithium oxide and carbon disulfide at a molar ratio of 1:1, transfer to a closed reactor, heat up to 450°C at a heating rate of 5°C / min, keep it warm for 10 hours, and cool down to At 100°C, use a vacuum pump to pump out the gas in the reactor, transfer it to a helium protective atmosphere, open the reactor, take out the powder and pour it into absolute ethanol, fully dissolve it and filter it, heat and evaporate the filtrate to obtain lithium sulfide powder body.

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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 through solid-liquid mixing and heating. The invention disclosesa method for preparing high-purity lithium sulfide in order to overcome the defects that the demand of a scientific research institution for lithium sulfide is increased and an existing preparation method is tedious in step and harsh in condition. According to the method, the lithium sulfide powder with relatively high purity can be obtained only by simply mixing and heating the raw materials andcarrying out subsequent purification treatment, the preparation method provided by the invention is simple and convenient, industrial production is easy to realize, the manufacturing cost is low, andthe purity of the obtained lithium sulfide is relatively high.

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 using solid-liquid mixing and heating. Background technique [0002] Lithium-sulfur batteries are considered to be one of the most promising next-generation batteries (Jiang, Li 2 S-based Li-ionsulfur batteries: progress and prospects), while lithium sulfide Li 2 S is a hot spot in the research of lithium-sulfur batteries. Compared with traditional lithium-sulfur batteries that use sulfur as the positive electrode of the battery, lithium sulfide as the positive electrode material has many advantages: (1) Lithium sulfide is already the final reaction of lithium and sulfur During the first charging process, there will be no volume expansion effect, thus ensuring the safety of the positive electrode material; (2) Lithium sulfide has a very high melting point (938 ° C), this thermal stability also ensures that lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/22H01M4/58H01M10/052
CPCC01B17/22H01M4/5815H01M10/052H01M2004/028C01P2002/72Y02E60/10
Inventor 梁初胡梦茹王凯甘永平黄辉张文魁夏阳张俊
Owner ZHEJIANG UNIV OF TECH
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