Preparation and application of lithium sulfide Li2S

Overview of lithium sulfide Li2S powder

Lithium sulfide, molecular formula: Li2S, is lithium sulfide, molecular weight: 45.95. White to yellow crystals. It has an anti-fluorite structure. The specific gravity is 1.66 (water = 1), the melting point is 938°C, and the boiling point is 1372°C. It is easily soluble in water, soluble in ethanol, soluble in acid, and insoluble in alkali. It can be used as a potential electrolyte material in rechargeable lithium-ion batteries.

Lithium sulfide is an inorganic compound with the molecular formula Li2S. It will crystallize in the form of anti-fluorite, called salt (Li+) 2S2-. It forms a solid yellow-white deliquescent powder. In the air, hydrogen sulfide (rotten egg smell) is easily released. Lithium sulfide is a source of lithium that is moderately soluble in water and acid and is used for purposes compatible with sulfate. Sulfate compounds are salts or esters of sulfuric acid, formed by substituting one or two hydrogens with metals.

Hydrogen sulfide can be released by acid. It can react with nitric acid solution, but hydrobromic acid and hydroiodic acid can only be oxidized by oxygen when heated to about 300°C in the air without producing sulfur dioxide. Is to generate lithium sulfate.

Lithium sulfide is usually slightly harmful to water bodies. Do not expose unsubstituted or large amounts of products to the ground, waterways or sewage systems, and believe that the government does not allow the discharge of materials into the surrounding environment.

In the air, it is easy to absorb water vapor and hydrolyze, releasing highly toxic hydrogen sulfide gas. Hydrogen sulfide can be liberated by acid; it can react violently with nitric acid, but hydrobromic acid and hydroiodic acid can only decompose it when heated. It reacts slowly with concentrated sulfuric acid, but reacts violently with dilute sulfuric acid. When heated to about 300°C in the air, it is oxidized by oxygen, but does not generate sulfur dioxide, but generates lithium sulfate.

Lithium sulfide Li2S powder preparation

The lithium sulfide is prepared as follows: under the protection of an argon atmosphere, 0.57 g of silicon sulfide powder and 0.37 g of lithium oxide are uniformly mixed and then added to a ball mill tank. Then put the ball into the ball mill jar and seal it. The ratio of the total mass of the grinding ball to the total mass of the material is 40:1. At room temperature, the ball milling tank was continuously ball milled at a speed of 500 r/min for 12 hours. After the reaction, under an argon atmosphere, take out the solid product from the ball mill tank and add it to benzene, and separate the solid from the liquid to obtain a benzene solution of silicon sulfide. Distillate and recover liquid benzene and solid silicon sulfide at 85°C. The separated solid is added to ethanol, after solid-liquid separation, the solution is distilled at 120°C to obtain a solid, and the solid is dried at 100°C to obtain lithium sulfide powder. The resulting product is pure phase lithium sulfide.

1) Preparation of lithium iron sulfide, which is characterized by comprising: a first step of mixing iron sulfide (a) and sulfur to obtain a mixture of iron sulfide (a) and sulfur, and then combining the iron sulfide (a) and sulfur The mixture is fired in an inert gas environment to obtain a sulfide that is roughly a single phase in X-ray diffraction analysis, and the composition ratio of iron to sulfur (Fe/S) is 0.90 or more and less than 1.00 in terms of molar ratio Iron (b); In the second step, the iron sulfide (b) and lithium sulfide are mixed to obtain a mixture of the iron sulfide (b) and lithium sulfide, and then the mixture of the iron sulfide (b) and lithium sulfide is prepared It is fired in a lively gas environment to obtain lithium iron sulfide represented by Li2FeS2.

2) Preparation of a positive electrode material doped with lithium carbon sulfide core-shell structure, including the following steps: Step (1): Mix lithium sulfide with metal oxide powder, and then put it in a sealed ball milling jar, and then put it in The ball mill performs ball milling to obtain doped nano lithium sulfide; step (2): add the carbon source to ethanol while stirring, and dissolve to form an ethanol solution containing the carbon source; step (3): disperse the obtained nano lithium sulfide into the ethanol solution Then, the ethanol solution containing the carbon source is added dropwise to the suspension, and added to the muffle furnace protected by inert gas to react to obtain carbon-coated lithium sulfide; step (4): the carbon-coated lithium sulfide and Graphene is added to tetrahydrofuran, and the solvent is evaporated to obtain a graphene/carbon-coated doped lithium sulfide composite material. The doped metal ion of the present invention can change the crystal structure of lithium sulfide, which is beneficial to the improvement of the electrical conductivity of the lithium sulfide body and improves its electrochemical performance.

Lithium sulfide (Li2S) is a product specially designed for high-performance batteries and can be used as a precursor for electrode materials or solid electrolytes. As an electrode material, it not only has high capacity, but also overcomes many problems caused by pure sulfur electrodes.

Lithium sulfide is an anti-fluorite semiconductor (band gap of 3.865eV). It exists in an orthogonal and cubic structure. The densities of the orthogonal and cubic structures are 1.75g/cm3 and 1.63g/cm3, respectively.

Lithium sulfide has been studied as a superconductor similar to MgB2. It is also used as a positive electrode material for rechargeable lithium-sulfur batteries.

Lithium sulfide Li2S powder price

The price of lithium sulfide will vary randomly with factors such as lithium sulfide production costs, transportation costs, international situations, and market supply and demand. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for lithium sulfide, please feel free to send an inquiry to get the latest price of lithium sulfide Li2S.

Lithium sulfide Li2S powder supplier

As a global lithium sulfide supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (chromium sulfide, zinc sulfide, nickel sulfide), high-purity targets, functional ceramics and structural devices, and provides OEM services.