10 results about "Vanadium chloride" patented technology

The invention provides a method for preparing a vanadium electrolyte from a waste vanadium-based battery positive electrode material. The method comprises the following steps: crushing a waste vanadium-based lithium ion / sodium ion battery positive electrode material to obtain positive electrode powder; mixing with a reducing agent, granulating, and calcining in an inert atmosphere to obtain carbon-containing pellets; performing chlorination reaction after crushing and grinding; the gaseous product is subjected to step-by-step condensation separation to obtain phosphorus oxychloride, vanadium trichloride and residues, and the residues comprise lithium chloride and / or sodium chloride and can be recycled; dissolving phosphorus oxychloride in water to obtain a mixed solution of phosphoric acid and hydrochloric acid, and dissolving vanadium trichloride in hydrochloric acid or mother liquor to obtain a solution; concentrating, crystallizing and separating to obtain vanadium trichloride crystals and mother liquor, and recycling the mother liquor; and dissolving the crystals in an acid solution, supplementing hydrochloric acid and / or sulfuric acid, and carrying out electrolytic adjustment to obtain the vanadium electrolyte. According to the method, vanadium and phosphorus elements in the waste vanadium-based lithium / sodium ion battery positive electrode material can be recycled and converted into the vanadium electrolyte, the recycling process is short, and the energy consumption cost in the recycling process is low.

The invention relates to a preparation method of a phosphorus defect bimetallic oxygen evolution catalyst. The preparation method comprises the following steps: S1, dissolving 2.4 mmol of nickel chloride hexahydrate, 0.8 mmol of vanadium chloride and 300mg of urea in 80ml of deionized water, and uniformly stirring for 10 minutes; s2, putting a product obtained in the step S1 and foamed nickel into a 100ml reaction kettle, reacting at 120 DEG C for 12 hours, and drying in a drying box after reaction; s3, putting the product in S2 and 0.8 g of sodium dihydrogen phosphate into a tubular furnace, heating to 350 DEG C at a heating rate of 3 DEG C / min in an argon atmosphere, and reacting for 3 hours to obtain nickel vanadium phosphide loaded foamed nickel; and S4, the product obtained in the S3 is put into a sodium borohydride solution to be soaked for 30 min, the product is taken out and dried, and a final product, namely the nickel vanadium phosphide loaded foamed nickel with the vacancy defect, is obtained.

The application belongs to the technical field of water electrolysis catalysts, and particularly relates to a preparation method of a three-dimensional core-shell structure composite material, which comprises the following steps: dissolving nickel nitrate, vanadium chloride and urea in a mixed solvent, and carrying out a hydrothermal reaction with foamed nickel; after cooling, washing and drying, NiV-LDH is obtained; thiourea is dissolved in water, and a hydrothermal reaction is carried out with the NiV-LDH; after cooling, washing and drying, V-doped Ni3S2 is obtained; a nickel salt is added into ultrapure water, and an electrochemical method is directly used for electrodeposition, so that the V-doped Ni3S2 core-shell structure composite material coated with NiOOH is obtained. The application also relates to the V-doped Ni3S2 core-shell structure composite material coated with NiOOH prepared by the above method and application thereof.

The present invention relates to the technical field of chemical metallurgy, and provides a method for preparing and purifying high-purity vanadium sponge. The method comprises: preparing a vertical vacuum reduction furnace, adding a reducing agent thereto, removing air from the furnace and introducing a protective gas thereinto; performing heating, adding vanadium chloride, then performing smelting, and after removal, placing same into a distillation furnace for heating and temperature-holding treatments; and finally, placing a product into a crucible in an electron beam furnace, performing evacuation, heating same to perform smelting, introducing a protective gas into the electron beam furnace after smelting, and cooling same to room temperature, so as to obtain a vanadium sponge product. In the present invention, high-purity vanadium sponge is prepared from a chloride of vanadium by means of a new metallothermic reduction-distillation method, and is further purified by means of vacuum electron beam refining. Therefore, the common technical problems of a long process, a low product purity, etc., during the preparation of high-purity vanadium metal by means of traditional methods are solved.

The invention is suitable for the technical field of electrochemistry, and provides an S-NiV-LDH catalyst and a preparation method and application thereof.The preparation method comprises the following steps that cut foamed nickel is sequentially washed with nitric acid, ethyl alcohol and deionized water under ultrasound and dried; the preparation method comprises the following steps: dissolving nickel chloride hexahydrate, vanadium chloride, urea and thiourea in deionized water, stirring, transferring into a hydrothermal reaction kettle with a polytetrafluoroethylene lining containing treated foamed nickel, carrying out hydrothermal reaction, cooling to room temperature, washing, and carrying out vacuum drying to obtain the S-NiV-LDH catalyst. The preparation method provided by the invention is simple and convenient, and required equipment and raw materials are rich in source, easy to obtain and easy to repeat.

The invention discloses mangiferin / vanadium / PVP (Polyvinyl Pyrrolidone) composite nanoparticles as well as a preparation method and application thereof, and belongs to the field of nano medical materials. The composite nano particle disclosed by the invention is formed by self-assembling mangiferin, vanadium trichloride hexahydrate and polyvinyl pyrrolidone under the coordination action. The preparation method is simple and convenient, conditions are mild, the prepared nanoparticles are uniform in particle size, have good water dispersibility and photothermal conversion performance and have inherent bacteriostatic activity on various bacteria, and the antibacterial effect can be synergistically enhanced under irradiation of near-infrared light. The material has application prospects in the biomedical fields of antibiosis, photo-thermal therapy preparations and the like.

This invention belongs to the field of vanadium chemical industry, and particularly relates to a method for vanadium precipitation from sodium vanadium chloride solution, comprising the following steps: a) adjusting the pH of the sodium vanadium chloride solution to 6-7 with sulfuric acid and stirring to obtain a pre-adjusted vanadium solution; b) adjusting the pH of the pre-adjusted vanadium solution to 3.5-5.5 with vanadium pentoxide and stirring to obtain a further adjusted vanadium solution; c) mixing the further adjusted vanadium solution with ammonium salt and carrying out a vanadium precipitation reaction at 45-60°C; then raising the temperature of the reaction system to above 92°C to continue vanadium precipitation, obtaining a vanadium precipitate. The method provided by this invention can reduce the amount of sulfuric acid used for vanadium precipitation, and has good economic and environmental benefits.

The invention discloses a high-efficiency wide-pH self-supporting electro-catalytic material and a preparation method thereof, and relates to the technical field of electro-catalytic material preparation, and the preparation method comprises the following steps: carrying out ultrasonic cleaning and drying on a carbon / carbon matrix, then carrying out pre-oxidation treatment, mixing copper chloride, vanadium trichloride and polyvinylpyrrolidone with deionized water, taking the carbon / carbon matrix as a cathode, and preparing the high-efficiency wide-pH self-supporting electro-catalytic material. Taking high-purity graphite as an anode and the prepared solution as electrolyte to perform deposition reaction, taking out a sample after cooling, drying, putting a carbon / carbon-based composite material obtained by deposition treatment into a ceramic boat, putting sodium hypophosphite into another ceramic boat, simultaneously putting into a tubular furnace, and calcining in a nitrogen atmosphere to obtain the self-supporting electro-catalytic material. According to the high-efficiency wide-pH self-supporting electro-catalytic material and the preparation method thereof, the dispersity of catalytic components can be improved, and the problems that the performance of a catalytic active material is reduced and the catalytic active material is easy to fall off due to the use of a binder in a powder electro-catalyst can be avoided.

The application discloses a kind of all-vanadium redox battery electrolyte and its preparation method and application, belong to the technical field of preparation of flow battery.The all-vanadium redox battery electrolyte includes positive electrolyte and negative electrolyte, the positive electrolyte includes the following raw materials: vanadyl sulfate, vanadium pentoxide, sulfuric acid, organic phosphoric acid stabilizer and carbon nanotube;The negative electrolyte includes the following raw materials: vanadium trichloride, vanadium dichloride, sulfuric acid, organic phosphoric acid stabilizer and carbon nanotube.The preparation method includes raw material preparation, dissolving mixing, adding stabilizer and carbon nanotube and adjusting pH value and the like steps.The electrolyte prepared by the application can effectively inhibit precipitation crystallization, reduce battery internal resistance, improve energy conversion efficiency, prolong battery service life and promote commercial application of all-vanadium redox battery.

The invention discloses a metal ion intercalation vanadium pentoxide nanobelt as well as a preparation method and application thereof, and belongs to the technical field of battery material application. The preparation method comprises the following steps: heating alkali metal nitrate in an air atmosphere until the alkali metal nitrate is molten, then adding vanadium trichloride for reaction, cooling, washing, filtering and drying to obtain the metal ion intercalated vanadium pentoxide nanobelt. The method is short in reaction time, mild in condition, simple in process, high in yield and suitable for industrial production. The obtained nanobelt has uniform morphology and a stable interlayer pillared structure, the conductivity, the specific capacity and the cycling stability of the zinc ion battery positive electrode material can be remarkably improved, and the capacity retention rate of an electrode can reach 98.5% after the electrode is circulated 1200 times at the multiplying power of 5 A.g <-1 >. The invention provides an efficient and reliable way for preparing the high-performance zinc ion battery positive electrode material.