Preparation method of alkali metal and alkaline earth metal sulfide

An alkaline earth metal and alkali metal technology, applied in the direction of alkali metal sulfide/polysulfide, magnesium/calcium/strontium/barium sulfide/polysulfide, etc. , high equipment requirements, to achieve the effect of high yield, short reaction time and low cost of raw materials

Active Publication Date: 2022-03-18
UNIV OF SCI & TECH BEIJING
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  • Claims
  • Application Information

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Problems solved by technology

However, most of the technical processes have problems such as cumbersome process, time-consuming and energy-consuming, high equipment requirements, high cost, etc., and

Method used

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  • Preparation method of alkali metal and alkaline earth metal sulfide
  • Preparation method of alkali metal and alkaline earth metal sulfide
  • Preparation method of alkali metal and alkaline earth metal sulfide

Examples

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Effect test

Embodiment 1

[0024] Lithium hydroxide and thiourea were mixed in a molar ratio of 1:2.6, ground in a mortar for 20 minutes, then transferred to a crucible, placed in a tube furnace, and kept at 400°C for 3 hours under argon to obtain lithium sulfide, X The ray diffraction pattern see figure 1 ;

Embodiment 2

[0026] Sodium chloride and thiourea were mixed according to the molar ratio of 1:3.2, ground in a mortar for 20 minutes, then transferred to a crucible, placed in a tube furnace, and kept at 400°C for 2.5 hours under argon to obtain sodium sulfide. X-ray diffraction pattern see figure 2 ;

Embodiment 3

[0028] Mix calcium hydroxide and thiourea at a molar ratio of 1:3, grind in a mortar for 30 minutes, transfer to a crucible, place in a tube furnace, and keep warm at 550°C for 12 hours under argon to obtain calcium sulfide, X The ray diffraction pattern see image 3 ;

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Abstract

The invention relates to a preparation method of alkali metal and alkaline earth metal sulfide. The preparation method comprises the following steps: (1) uniformly mixing a substance containing alkali metal or alkaline earth metal and thiourea according to a molar ratio of alkali metal or alkaline earth metal element in the substance containing alkali metal or alkaline earth metal to sulfur element in thiourea of 1: (0.4-8); (2) heating the uniform mixture in vacuum or in a certain atmosphere, and carrying out heat preservation for a period of time; and (3) after the heat preservation is finished, naturally cooling the product to room temperature, and then taking out the product, namely the alkali metal and alkaline earth metal sulfide. The method can be used for preparing alkali metal and alkaline earth metal sulfides such as lithium sulfide, sodium sulfide, potassium sulfide, magnesium sulfide, calcium sulfide, strontium sulfide and barium sulfide, the selected raw materials are low in cost, the time for obtaining the product is short, the operation is simple, the equipment requirement is low, the yield is high, and industrial mass production is easy.

Description

technical field [0001] The invention relates to the field of energy materials, in particular to a method for preparing alkali metal and alkaline earth metal sulfides. Background technique [0002] Current lithium-ion battery technology in industrial applications is limited by ~300Wh / kg energy density, while high theoretical specific capacity and energy density, low-cost rechargeable alkali-sulfur batteries are considered to be the most promising next-generation storage batteries. It is one of the energy technologies, but direct use of alkali metals as negative electrode materials is likely to cause problems such as dendrites, and it is difficult to guarantee battery cycle life and safety issues. However, alkali metal sulfides are used as positive electrode materials, and non-alkali metal silicon, tin, graphite negative electrodes Collocation can achieve high capacity while improving safety and making it easier to realize practical applications. Alkaline earth metal sulfides...

Claims

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Application Information

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IPC IPC(8): C01B17/24C01B17/42
CPCC01B17/24C01B17/42C01P2002/72C01P2006/80Y02E60/10
Inventor 李平马智慧史洁韩坤
Owner UNIV OF SCI & TECH BEIJING
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