6 results about "Silicon disulfide" patented technology

The invention provides a preparation method of high-purity lithium sulfide, which comprises the following steps: (1) under the protection of inert atmosphere, mixing and dispersing silicon sulfide and lithium fluoride, transferring into a reactor, heating the material in the reactor to a certain temperature under the inert atmosphere, and keeping the temperature for a certain time for reaction to obtain a lithium sulfide crude product and silicon fluoride gas; and (2) dissolving the lithium sulfide crude product in an organic solvent, filtering to remove insoluble impurities, concentrating, and drying to obtain the high-purity lithium sulfide. The preparation method is simple and efficient, and the prepared lithium sulfide is high in purity.

The application discloses a quasi-solid-state sodium battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The quasi-solid-state sodium battery electrolyte provided by the application comprises a photocuring agent, a sodium ion electrolyte and a two-dimensional material; the two-dimensional material comprises one or more of fluorinated graphene, titanium nitride, boron nitride, silicon disulfide, tungsten disulfide and silicon carbide. The quasi-solid-state sodium battery electrolyte provided by the application has good mechanical strength and mechanical stability, can reduce the resistance of the quasi-solid-state sodium battery electrolyte, and improve the ionic conductivity; when the quasi-solid-state sodium battery electrolyte is applied to a sodium metal battery, the sodium metal battery has higher specific capacity under small and large rates, and can maintain long-time cycle stability.

This invention discloses a sulfide solid electrolyte, its preparation method, and a battery, belonging to the field of battery material technology. The preparation of the sulfide solid electrolyte includes: thermally reacting the raw materials for the preparation of the sulfide solid electrolyte; tangentially filtering the material obtained after the thermal reaction; and spray-drying the solid obtained from the tangential flow filtration. The raw materials include a first precursor, a second precursor, and a solvent. The first precursor includes lithium sulfide, and the second precursor includes at least one selected from phosphorus pentasulfide, silicon sulfide, germanium sulfide, tin sulfide, sodium sulfide, potassium sulfide, ammonium sulfide, calcium sulfide, and arsenic sulfide. This method has a relatively simple process flow and operation, low energy consumption and cost, and high production efficiency, making it suitable for industrial production. The sulfide solid electrolyte obtained in this way is relatively soft, making it easier to contact the positive and negative electrodes under extrusion conditions during the further preparation of the battery, improving density, thereby facilitating electron transport and reducing losses.

This invention discloses a method for preparing rare earth sulfides and colorants. The method uses rare earth oxides, molybdenum sulfide, and elemental silicon as raw materials. First, molybdenum sulfide and elemental silicon undergo a high-temperature reaction to generate silicon sulfide gas. Then, the silicon sulfide gas undergoes a reducing sulfidation reaction of the rare earth oxides to generate the corresponding rare earth sulfides. Finally, the reaction product is leached with alkali to remove soluble impurities, followed by filtration, rinsing, and drying to obtain high-purity rare earth sulfides. This process yields rare earth sulfide powder and ultrafine molybdenum silicide powder as a byproduct. Furthermore, the phase and color of the rare earth sulfides can be controlled by doping with alkali metals and alkaline earth metals. This invention is a novel method for synthesizing rare earth sulfide powder. Compared to other methods, it has the following advantages: universal applicability, low raw material cost, safe and controllable reaction process, high purity of reaction products with no solid waste generation, and ease of industrial-scale production.

The present invention provides a β-cesium cadmium silicon sulfide compound, a β-Cs2CdSi4S10 infrared nonlinear optical crystal, as well as their preparation methods and applications. The β-cesium cadmium silicon sulfide compound has a chemical formula β-Cs2CdSi4S10 and a molecular weight of 755.04. The β-Cs2CdSi4S10 infrared nonlinear optical crystal belongs to the tetragonal crystal system, its space group is I-4, and its unit cell parameters are: a=8.4233(7) Å, c=14.6136(12) Å, and the unit cell volume is 1036.86(19) Å3. The present invention adopts a vacuum packaging method to prepare a β-Cs2CdSi4S10 infrared nonlinear optical crystal. By using the kurtz-berry method, it was found that the frequency doubling effect of β-Cs2CdSi4S10 crystal is approximately 1.1-1.2 times that of AgGaS2(AGS). By using the UV-visible diffuse reflection, it was found that the β-Cs2CdSi4S10 crystal has the crystal bandgap of 4.21 eV, the UV cutoff edge of 254 nm, and the infrared transparency range greater than 13 μm. The preparation method of the β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention is simple, with a short growth period, and avoids the leakage and contamination of raw materials. The β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention can be used to fabricate conversion devices for high-power laser output applications and has important applications in atmospheric remote sensing and communication fields.