6results about "Lead halides" patented technology

This invention discloses a ligand-assisted redeposition method for preparing lead halide perovskite nanocrystals. The preparation includes the following steps: (1) Weighing powders in sequence according to the following mass values: 0.147 g lead bromide, 0.085 g cesium bromide, and 0.09 g zinc bromide; (2) Placing the raw materials into a glass bottle containing solution A and stirring magnetically for 0.5 h, then adding the mixed solution into the glass bottle and stirring magnetically for 0.5 h until the solution is clear and transparent; (3) At room temperature, adding the precursor solution to a vigorously stirred antisolvent and stirring for 1 min to obtain a crude solution of lead halide perovskite nanocrystals, which is then centrifuged and purified to obtain the lead halide perovskite nanocrystal solution. The new preparation method of lead halide perovskite nanocrystals provided by this invention proposes a new preparation method of lead halide perovskite nanocrystals by changing the type of antisolvent and adding zinc bromide, and simplifies the purification steps and optimizes the luminescence properties of inorganic lead halide perovskite materials. The preparation method of the present invention has the advantages of low cost, simple operation and rapid preparation; the method of the present invention can prepare inorganic lead halide perovskite nanocrystal materials with adjustable luminescence range, good photoluminescence performance and high stability.

Disclosed is a method for manufacturing formamidine for perovskite materials for atomic layer deposition (ALD). The method for manufacturing formamidine according to the present invention comprises the steps of: (a) maintaining the temperature of a reactor at or below 20°C; (b) introducing a formamidine-acid compound, a basic compound, and water into the reactor; and (c) maintaining the temperature of the reactor at 60-70°C, and then raising the temperature to 70-80°C to manufacture the formamidine.

This invention belongs to the field of waste resource recycling and optoelectronic material preparation technology, specifically relating to a method for preparing perovskite light-emitting / photovoltaic devices by recycling lead metal from waste lead-acid batteries. This method focuses on recycling waste lead-acid batteries through a "wet-fire-wet" green process. The disassembled electrode plates undergo desulfurization, calcination, and halogenation processes to recrystallize and obtain lead halides (PbI2 and PbBr2), which are then used as raw materials for preparing high-performance perovskite light-emitting / photovoltaic devices. The purpose of this invention is to solve the technical problems of complex production processes, high energy consumption, high cost, low recovery rate, and limited applicability in existing waste lead-acid battery recycling processes. It provides a method for purifying halides from lead paste materials from waste lead-acid batteries, changing the traditional approach to lead paste recycling. This method is simple, easy to operate, consumes little energy, has a high recovery rate, produces high-purity recycled products, and does not generate wastewater or waste gas byproducts, achieving the goal of energy conservation and emission reduction.

Disclosed are a perovskite material for a solar cell, the perovskite material having improved storage stability due to the addition of CsI, and a method for preparing same. A method for preparing a perovskite material according to the present invention comprises the steps of: (a) mixing cesium iodide (CsI), formamidinium iodide (FAI), and lead iodide (PbI2); (b) adding an organic solvent to the mixed mixture and then stirring at 100-140°C; and (c) filtering the stirred black powder under reduced pressure and then drying to prepare a CsdFAePbI3 (d+e=1) perovskite material.

The application belongs to the field of perovskite materials, and discloses high-purity lead bromide and a production method thereof. The production method of the high-purity lead bromide comprises the following steps: heating and stirring a lead acetate solution, adding a hydrobromic acid solution dropwise into the lead acetate solution, keeping the reaction under the condition of heating and stirring, and then sequentially cooling, aging, solid-liquid separation, washing and drying the obtained solid particles, so that the high-purity lead bromide is obtained. The production method provided by the application controls the reaction system in an acidic environment, which can accelerate the precipitation reaction rate of lead ions and bromine ions, promote the rapid generation of lead bromide crystals, adjust the system dissolution balance in the acidic environment, reduce the solubility product Ksp of lead bromide, reduce the loss of lead ions, ensure that the lead ions are fully converted into lead bromide precipitates, and further improve the yield and purity of the product.

The application discloses a method for wetly and cooperatively recovering lead and zinc from manganese fly ash and preparing trimanganese tetraoxide, valuable elements in the manganese fly ash are separated and recovered through hydrometallurgical technologies such as water immersion for salt removal, selective leaching of zinc by using dilute hydrochloric acid with a specific concentration, complex leaching of lead by using an acidic sodium chloride solution, and the like, and finally, trimanganese tetraoxide products, lead compounds and zinc compounds are obtained; the application replaces a traditional sulfuric acid system with a hydrochloric acid system, thereby avoiding adverse effects of impurity calcium sulfate on experiments; through accurate control of leaching conditions and an innovative washing process, a complex pollution problem caused by introduction of chloride ions is effectively solved, efficient and high-selectivity separation and recovery of manganese, lead and zinc are realized, a process flow is simple, product purity is high, and the application provides a comprehensive solution with economic efficiency and low carbon for recovery of the manganese fly ash.