4 results about "Sodium polysulfide" patented technology

This invention discloses a WS2 / WO2 composite material, its preparation method, and its application in sodium-sulfur batteries, belonging to the field of functional material preparation technology. The method includes: mixing cyclohexanol and oleic acid evenly to obtain a mixed solvent; adding tungsten hexachloride to the mixed solvent and stirring at room temperature until dissolved to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, washing, and drying to obtain W2 / WO2. 18 O 49 Powder; W 18 O 49 After the powder and sulfur source undergo a thermally controlled reaction under an inert atmosphere, a WS2 / WO2 composite material is obtained. This invention prepares a WS2 / WO2 composite material with a unique three-dimensional heterostructure through a simplified two-step method. By integrating the strong adsorption properties of WS2 and the high catalytic activity of WO2, and through interfacial coupling, the conversion of sodium polysulfides is synergistically accelerated. At the same time, its preparation process is significantly more complex than existing technologies, and can effectively suppress the shuttle effect, improve reaction kinetics, and enhance battery cycle stability.

This invention relates to a sodium polysulfide-based cyanide-free zinc-inhibiting composite inhibitor for lead-zinc separation, comprising, by weight: 1-2 parts sodium polysulfide, 3-5 parts zinc sulfate, 1-4 parts sodium metabisulfite, and 0.1-1.5 parts organic selectivity modifier; the sodium polysulfide is Na₂S. x The formula is: x = integers from 2 to 4; the organic selective regulator is one of L-cysteine, tannin, and modified corn starch; sodium polysulfide is the core zinc-inhibiting component; zinc sulfate and sodium polysulfide work synergistically to enhance the inhibition effect on sphalerite; and the organic selective regulator further strengthens the selectivity of "inhibiting zinc but not lead," reducing lead mineral loss. This invention's composite inhibition does not require operation under strongly alkaline conditions; only neutral slurry is needed to achieve efficient inhibition, significantly reducing the amount of lime used and avoiding the problem of excessively high alkalinity in the return water. This reduces the neutralization cost of return water treatment and fundamentally solves the problem of scaling and clogging in return water and slurry pipelines.

This invention utilizes microwave-assisted rapid preparation of Ni-ZIF-8 derived carbon materials. Using this material as the main component, sulfur is loaded as the active material to prepare the cathode material, which is then assembled into an RT Na-S battery. The process is simple, structurally stable, and exhibits excellent electrochemical performance, possessing certain practical application value. By introducing metallic nickel to modify the basic structure of ZIF-8, the derivative acquires certain catalytic capabilities, and the precursor Ni-ZIF-8 is prepared using a simple synthetic reaction. Then, by introducing a microwave absorber, rapid carbonization is achieved under microwave irradiation to obtain the Ni-ZIF-8 derived carbon material. The drastic temperature change causes the bulk structure of the precursor to break down during carbonization, preserving the high specific surface area and abundant active sites of traditional ZIFs while enhancing the material's conductivity. Relying on the high specific surface area, abundant active sites, and excellent conductivity of the Ni-ZIF-8 derived carbon material, the synergistic effect of "physical adsorption-chemical adsorption-catalytic conversion" effectively suppresses sodium polysulfide shuttle, reduces internal battery polarization, and exhibits excellent electrochemical performance.

This application belongs to the field of battery technology, specifically disclosing a battery cell, a method for preparing the battery cell, a battery device, and an electrical device. The battery cell provided in this application includes a positive electrode sheet, which includes a positive electrode active material. The positive electrode active material includes a sulfur-carbon composite material, which includes a porous carbon material and a sulfur-containing active material supported on the porous carbon material. The sulfur-containing active material includes any one or more of elemental sulfur, sodium sulfide, or sodium polysulfide. The porous carbon material has micropores and mesopores, which are interconnected to form a tortuous pore structure. The negative electrode sheet includes a sodium metal sheet. The battery cell provided in this application improves battery capacity by reducing the loss of positive electrode active material during battery cycling.