50 results about "Nickel compounds" patented technology

The invention discloses a method for preparing high-purity nickel acetate from crude nickel carbonate in the technical field of nickel compound purification, which comprises the following steps: mixing the crude nickel carbonate with deionized water to obtain a suspension, and adding glacial acetic acid to react to obtain a nickel acetate solution; then a specially-made hierarchical-pore titanium silicalite molecular sieve loaded bimetallic nanocluster material is added for purification treatment, the material is obtained through precise preparation, the method comprises the steps of carrier modification, bimetallic loading, hydrophobic modification, activation balance and the like, and the material has excellent impurity adsorption capacity and chemical stability; carrying out concentration crystallization and solid-liquid separation on the purified solution to obtain wet nickel acetate crystals; the mother liquor is subjected to adsorption treatment again, crystals in the mother liquor are recycled, and finally all the crystals are combined and dried to obtain a high-purity nickel acetate product. The process is simple and efficient, the purity of the prepared nickel acetate exceeds 98.5%, the content of each impurity is superior to the industrial standard, and the mother liquor can be recycled, is environment-friendly and is suitable for industrial production.

The invention discloses a preparation method of high-dispersion superfine spherical nickel powder, which comprises the following steps: preparing nickel salt, a complexing agent and a dispersing agent into a nickel salt aqueous solution, converting a precipitant aqueous solution into precipitant micro-nano aerosol, adding the precipitant micro-nano aerosol into the nickel salt aqueous solution, and carrying out gas-liquid phase confinement micro-zone pre-reaction to obtain the high-dispersion superfine spherical nickel powder. And carrying out homogeneous hydrothermal reaction and vacuum roasting to obtain the high-dispersion superfine spherical nickel powder. According to the method, low-cost and low-pollution soluble nickel salt is used as a nickel source, aerosol confinement microcell reaction is established, controllable preparation of spherical nickel particles with high purity, high sphericity degree, high dispersity and uniform morphology is achieved, the high-dispersion superfine spherical nickel powder is effectively obtained under the conditions of low cost and low energy consumption, and the method is suitable for industrial production. The high-dispersion superfine spherical nickel powder meets the requirements of high-dispersion superfine spherical nickel powder required by inner electrode slurry of various sizes for the MLCC, meanwhile, the high-dispersion superfine spherical nickel powder has good fluidity, and preparation of high-performance inner electrode slurry of the MLCC is facilitated.

A photoelectric synthesis method for ketone compounds, the present invention relates to the field of organic photoelectric synthesis technology. The present invention solves the technical problem that existing reaction technologies are difficult to achieve in-situ activation of aromatic formic acid and direct coupling with hydrocarbons to prepare ketone compounds. The present invention continuously irradiates the reaction system and passes a constant current, uses carboxylic acid and hydrocarbons as reactants, forms chlorine radicals through an iron catalyst, and the chlorine radical intermediates extract hydrogen from the hydrocarbons to obtain an alkyl radical. At the same time, an acyl nickel compound intermediate is formed at the cathode, and then the intermediate captures the alkyl radical, and a reduction elimination process occurs to obtain a ketone product. This reaction uses the electrons provided by the current in the system as a cheap and clean oxidant, avoiding the use of an external oxidant, and the reaction operation is simple and the conditions are mild. The ketone compounds prepared by the present invention are used in the field of treatment of neurodegenerative diseases.

The invention discloses a self-supporting compound lithium ion battery electrode and a preparation method thereof. The preparation method of the self-supporting compound electrode comprises the following steps: (1) reacting a mixed aqueous solution of an iron-containing compound, a nickel-containing compound and urea with a conductive substrate to obtain a self-supporting substrate containing an iron / nickel precursor; and (2) carrying out annealing treatment on the self-supporting substrate containing the iron / nickel precursor in an ammonia gas atmosphere, cooling, and then purging and passivating by inert gas to obtain the self-supporting compound electrode loaded with the nano Fe3O4 / Ni3FeN. The preparation method provided by the invention is simple and low in cost, and the self-supporting electrode has good cycling stability and rate capability, is suitable for industrial large-scale production, and can be widely applied to the field of lithium ion battery materials.

A positive electrode active material having both higher capacity and safety is provided. Provided is a method for manufacturing a positive electrode active material, including forming a mixed solution containing a cobalt compound and a nickel compound dissolved; making the mixed solution react with an alkaline aqueous solution to obtain a suspension in which a cobalt nickel hydroxide is precipitated; performing first suction filtration of the suspension with use of water; and after the first suction filtration, performing second suction filtration with use of an organic solvent. In the cobalt nickel hydroxide, an atomic ratio of nickel in the sum of an atomic ratio of cobalt and the atomic ratio of nickel is greater than 0 and less than or equal to 0.01.

This invention relates to the field of conductive paste technology, and discloses a silver-coated nickel conductive paste for photovoltaic cells and its preparation method. The conductive paste comprises 65-85 parts of nickel-based alloy core@Ag composite powder, 15-30 parts of auxiliary silver powder, 2-4 parts of glass powder, 25-35 parts of organic carrier, and 0.2-0.8 parts of interface adaptant. The alloying element in the nickel-based alloy core is selected from one or more of P, B, and Si, with P content of 0.5%-5.0%, B content of 0.1%-2.0%, and Si content of 1.0%-4.0%. The interface adaptant is selected from organosilver or organonickel compounds. Alloying reduces the Ag / Ni interface energy to inhibit dewetting, and the interface adaptant is used to repair micro-defects in situ, improve the integrity of the silver shell, reduce contact resistance, and improve cell efficiency and reliability.

The invention relates to the technical field of positive electrode materials, in particular to a modified positive electrode material, a preparation method thereof, a positive electrode plate and an electrochemical device. The modified positive electrode material comprises a high-nickel ternary positive electrode material and lanthanum nickel oxide coated on the surface of the high-nickel ternary positive electrode material, the high-nickel ternary positive electrode material is LiNixCoyMnzO2, x is greater than or equal to 0.6, and x + y + z = 1. The modified positive electrode material provided by the invention has excellent ionic conductivity, electronic conductivity and capacity retention rate, and the first efficiency and the specific capacity are effectively improved. In addition, the raw material lanthanum and nickel compounds of the lanthanum-nickel oxide are relatively low in cost, so that the cost of the positive electrode material is not greatly increased, and the application prospect is good.

A method of producing a positive electrode active material includes: obtaining a mixture by mixing a nickel-containing compound and a lithium compound, the nickel-containing compound being at least one of a nickel-containing hydroxide and a nickel-containing oxide; obtaining a molded body by molding the mixture; and calcinating the molded body at 750 to 1000° C. under an oxygen atmosphere using a rotary kiln having a furnace having an inner wall composed of an alloy including Cr. A maximum diameter of the molded body is 18 to 50 mm, and a density of the molded body is 1.5 to 4 g / cm3.

The invention discloses a supported Ni-based alloy catalyst preparation method, which comprises: S1, dissolving a tungsten compound in water, loading on an Al2O3 carrier through an impregnation method, aging, drying, and roasting in air to obtain an intermediate; and S2, dissolving a nickel compound in water, loading the nickel compound on the intermediate through an impregnation method, aging, drying, roasting in air, and performing reduction treatment in an H2 atmosphere to obtain the catalyst. The catalyst is high in activity, good in selectivity and stability, simple in preparation method and low in cost.

An electrode assembly, a secondary battery, and an electrical apparatus. The electrode assembly includes a positive electrode plate, a negative electrode plate and a separator. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one side surface of the positive electrode current collector. The positive electrode film layer in the present application includes a nickel-containing compound and a binder. A molar percentage content of a nickel element in the nickel-containing compound based on a total molar amount of transition elements is Y, and a mass percentage content of the binder in the positive electrode film layer is X; and it is satisfied: Y / X<53.

This invention proposes a catalyst, preparation method, and application for the hydrodeoxygenation of sulfolane to tetrahydrothiophene. These catalysts address the technical challenges of expensive raw materials and catalysts, as well as complex process conditions, in the catalytic hydrogenation of thiophene and direct sulfidation of tetrahydrofuran. The synthesis of tetrahydrothiophene from sulfolane undergoes mild reaction conditions, and the entire production process produces only water as a byproduct, with no other pollutants. The catalyst incorporates a nickel-containing compound and a precious metal salt as active components. The active components are then reacted with a solution of a metal oxide (aluminum oxide or molybdenum oxide) precursor in a water bath with stirring. The resulting sample is then dried and calcined to produce the catalyst. Catalytic performance evaluation demonstrated a maximum sulfolane conversion of 97.5% and a tetrahydrothiophene selectivity of 98.0%.

The invention discloses a Ni-doped Bi4O5Br2 bifunctional photocatalyst as well as a preparation method and application thereof. The preparation method of the photocatalyst comprises the following steps: dissolving a bismuth-containing compound in ethylene glycol to form a solution A; dissolving a bromine-containing compound in ethanol to form a solution B; dropwise adding the solution B into the solution A to form a solution C; adding a nickel-containing compound into the solution C to form a reaction solution; and transferring the reaction solution into a reaction kettle for heating, and after the reaction is completed, filtering, washing and drying to obtain Ni-doped Bi4O5Br2 powder. According to the invention, Ni is doped into Bi4O5Br2, the Bi4O5Br2 has double functions of LSPR effect and impurity energy level engineering, the LSPR effect of Ni enables infrared light to be converted into hot electrons and heat energy and provides thermodynamic driving force for CO2 activation, and Ni doping also generates impurity energy level which can capture carriers and effectively inhibit recombination of electrons and holes, so that the performance of the Bi4O5Br2 is improved. The carbon dioxide reduction effect of the photocatalyst is remarkably improved through the dual-function synergistic effect.

One embodiment of the present invention provides a novel positive electrode active material, or a highly safe secondary battery. The positive electrode active material is manufactured in such a manner that after a nickel compound (also referred to as a precursor) containing nickel, cobalt, and manganese is obtained by a coprecipitation method, a mixture obtained by mixing a lithium compound and the nickel compound is heated at a first heating temperature, the heated mixture is crushed or ground and then heated at a second heating temperature which is higher than the first temperature, and magnesium is mixed and a third heat treatment is performed.

A method for producing a nickel compound, the method including: a step for preparing a starting material metal oxide which contains a first metal containing at least nickel and a second metal; a step for mixing the starting material metal oxide and an aqueous acid solution so as to obtain a first solution that contains ions of the first metal and the second metal by acid leaching; a first generation step for neutralizing the first solution with a first alkali so as to generate a solid content that contains the second metal and a second solution that contains at least ions of the first metal; a step for solid-liquid separating the second solution and the solid content; a second generation step for mixing the second solution and a second alkali that contains at least a metal hydroxide and ammonia so as to generate a nickel compound that contains at least nickel as the first metal and a third solution; and a step for solid-liquid separating the nickel compound and the third solution.

Provided is a method for producing a nickel compound, the method including: a step for preparing raw material metal compounds which include a first metal including at least nickel and a second metal including at least one component selected from the group consisting of magnesium, calcium, iron, silicon, zinc, copper, aluminum, and chromium; a step for mixing the raw material metal compounds with an aqueous acid solution for acid leaching to produce a first solution containing ions of the first metal and the second metal; a first production step for neutralizing the first solution with a first alkali to produce a solid matter containing the second metal and a second solution containing at least ions of the first metal; a step for subjecting the second solution and the solid matter to solid / liquid separation; a second production step for mixing the second solution with a second alkali including at least ammonia to produce a nickel compound containing at least nickel as the first metal and a third solution; and a step for subjecting the nickel compound and the third solution to solid / liquid separation.

An alkaline storage battery includes a positive electrode. The positive electrode includes a positive electrode mixture. The positive electrode mixture contains a nickel compound and a metal compound. The nickel compound is a positive electrode active material The metal compound is a compound of at least one metal element selected from the group consisting of titanium, niobium, tungsten, vanadium, molybdenum, zirconium, and tantalum. A ratio Wm / Wn of a mass Wm of the metal compound contained in the positive electrode mixture to a mass Wn of the nickel compound contained in the positive electrode mixture in terms of nickel hydroxide ranges from 0.2 / 100 to 5.0 / 100. The metal compound contains iron at a mass ratio ranging from 10 ppm to 10000 ppm. A ratio We / Wp of a mass We of the alkaline electrolyte to a mass Wp of the positive electrode mixture ranges from 0.35 to 1.0.

The application relates to the technical field of preparation of new carbon materials, and discloses a nano carbon cage and a preparation method and application thereof, the preparation method comprising the following steps: (1) physically mixing pitch and a nickel-containing compound, and then baking to obtain an intermediate product; wherein the softening point of the pitch is 130-300 DEG C; the baking temperature is 700-1200 DEG C, and the time is 60-240 min; (2) acid washing the intermediate product. The preparation method of the nano carbon cage can effectively improve the carbon yield and reduce the raw material cost by using pitch as a carbon source without using a template agent; the prepared carbon cage has high graphitization degree, thin cage wall, good specific capacity and good rate performance.

The invention discloses a cracking catalyst and a preparation method and application thereof, the cracking catalyst comprises a first component and a second component, the first component is a nickel modified ZSM-5 molecular sieve; and the second component is amorphous silica-alumina loaded with an active metal component. The preparation method of the cracking catalyst comprises the following steps: (1) treating a ZSM-5 molecular sieve to obtain a first ZSM-5 molecular sieve; (2) treating the first ZSM-5 molecular sieve with an ammonium salt solution to obtain a second ZSM-5 molecular sieve; (3) treating the second ZSM-5 molecular sieve and a nickel-containing compound solution to obtain a first material; (4) treating the amorphous silicon-aluminum and the active metal precursor solution to obtain a second material; and (5) mixing the first material, the second material and water, drying and roasting to obtain the cracking catalyst. The invention also provides a plastic and heavy oil co-conversion process. After the cracking catalyst is used, the yield of a liquid product can be obviously improved, carbon deposition of the catalyst is reduced, and the service life of the catalyst is prolonged.

This invention relates to the field of asymmetric catalytic hydrogenation, specifically to a method for preparing chiral chromone or chromane carboxylic acid compounds. The method involves preparing a chiral catalyst from a nickel compound and ligands. By controlling the combination of the nickel compound-ligand-solvent, enantioselective hydrogenation of the conjugated C=C bonds of the substrate chromone carboxylic acid compound is achieved, yielding the semi-reduced product chiral chromone carboxylic acid; or, further, the carbonyl group is reduced, and carbonyl reduction and dehydroxylation reactions are carried out at room temperature under trifluoroacetic acid and triethylsilane conditions to obtain the fully reduced product chiral chromane carboxylic acid. The catalytic system of this invention is simple to construct, and the selectivity can be controlled by the solvent system. It maintains high conversion and excellent enantioselectivity even under high S / C conditions, making it suitable for the efficient preparation of chiral chromone / chromane skeletal carboxylic acid compounds.

The invention discloses a preparation method for sodium chloride assisted synthesis of an oxygen vacancy-rich perovskite oxygen carrier and application. The preparation method comprises the following steps: S1, mixing a lanthanide compound, an iron compound and a nickel compound to obtain a primary raw material; s2, adding sodium chloride into the primary raw material to obtain a primary mixture; s3, grinding the primary mixture, putting the ground primary mixture into a tubular furnace, heating the tubular furnace from normal temperature to 800-850 DEG C, and calcining to obtain an intermediate product; s4, after the intermediate product is naturally cooled, sodium chloride contained in the intermediate product is removed through water washing operation, and the oxygen vacancy-enriched perovskite oxygen carrier is prepared. The invention relates to an application of an oxygen-vacancy-rich perovskite oxygen carrier. The oxygen-vacancy-rich perovskite oxygen carrier can be used in a preparation step of preparing synthesis gas by a methane chemical looping. The invention relates to an application of sodium chloride in synthesis of an oxygen-vacancy-rich perovskite oxygen carrier. The sodium chloride can be applied to synthesis and preparation steps of the oxygen-vacancy-rich perovskite oxygen carrier.

Disclosed is a method for producing a polymer, the method comprising polymerizing a conjugated diene monomer in the presence of a lanthanide-based catalyst system, the lanthanide-based catalyst system comprising: (i) a lanthanide-containing compound, (ii) triethylaluminum, (iii) aluminum hydride, and (iv) a halogen-containing compound; or a method for producing a polymer, the method comprising polymerizing a conjugated diene monomer in the presence of a lanthanide-based catalyst system, the lanthanide-based catalyst system comprising: (i) a nickel-containing compound, (ii) triethylaluminum, (iii) aluminum hydride, and (iv) a halogen-containing compound selected from a fluorine-containing compound and a chlorine-containing compound.

This invention discloses a method for preparing petroleum coke, comprising the following steps: pre-sulfurizing a catalyst, followed by hydrodesulfurization treatment with aromatic-enriched oil slurry; then polycondensation treatment, collecting the primary fraction; then secondary fractionation of the primary fraction, collecting the secondary fraction; and finally, delayed coking of the secondary fraction to obtain petroleum coke. In the catalyst preparation process, a porous γ-Al₂O₃ support coated with a chitosan layer is impregnated in a mixed aqueous solution of nickel and molybdenum compounds, followed by calcination to obtain the catalyst. This invention selects a suitable catalyst for hydrodesulfurization and combines it with appropriate process conditions to obtain a fraction with good flowability and containing a suitable amount of cycloalkane structure, achieving simultaneous adjustment of the reaction rate and flowability during delayed coking, ultimately obtaining petroleum coke. The petroleum coke obtained by this invention, after graphitization treatment, exhibits high graphitization degree and high capacity.

The application discloses a method for recycling lithium, nickel, cobalt and manganese in waste ternary lithium batteries by step leaching, and comprises the following steps: 1) pretreatment: calcining positive and negative electrode powders of the waste ternary lithium batteries for standby; 2) leaching and separating lithium: mixing the calcined powder in the step 1) with a lithium leaching agent to leach lithium, and after the leaching is completed, performing first solid-liquid separation to obtain a lithium carbonate solution; 3) leaching and separating nickel: mixing the solid obtained by the first solid-liquid separation with a nickel leaching agent to leach nickel, and after the leaching is completed, performing second solid-liquid separation to obtain a nickel compound solution; 4) leaching and separating manganese: mixing the solid obtained by the second solid-liquid separation with a manganese leaching agent to leach manganese, and after the leaching is completed, performing third solid-liquid separation to obtain a manganese compound solution, and the solid obtained by the third solid-liquid separation is a mixture of a cobalt compound and carbon. The application can deeply separate the nickel, cobalt, manganese and lithium, has high recovery rate, can realize continuous production and is suitable for industrial production.

Provided is a nickel recovery method for efficiently recovering nickel from a nickel solution containing 2,2'- bipyridine and a nickel compound generated in an organic chemical reaction process.　The nickel recovery method according to the present invention comprises: (a) a step for preparing a nickel solution containing 2,2'- bipyridine and a nickel compound generated in an organic chemical reaction process; (b) a step for adding an alkali metal perchlorate to the nickel solution to form a tris (2,2'- bipyridine) perchlorate nickel salt serving as an ion pair; and (c) a step for recovering the tris (2,2'- bipyridine) perchlorate nickel salt.

An aerosol-assisted chemical vapor-deposition (AACVD) method of making nickel sulfide (NiS) nanowires. The method includes depositing a nickel carbamate compound onto a conductive support by an AACVD technique to form nickel sulfide (NiS) nanowires on the conductive support, where the nanowires are present directly on a surface of the conductive support. The NiS electrode prepared by the process of the present disclosure showed excellent OER activity in 1.0 M KOH solution, with a low Tafel value (60 mV dec−1) and good OER stability. The NiS nanowires, as prepared, can be used in energy conversion devices such as batteries, fuel cells, and supercapacitors.

The application discloses a preparation method of high-dispersion superfine spherical nickel powder, which comprises the following steps: preparing a nickel salt aqueous solution by mixing a nickel salt, a complexing agent and a dispersing agent, converting a precipitant aqueous solution into a precipitant micro-nano aerosol, adding the precipitant micro-nano aerosol into the nickel salt aqueous solution, performing a gas-liquid phase limited micro-region pre-reaction, obtaining a suspension containing a nickel compound, then performing a homogeneous hydrothermal reaction and vacuum calcination, and obtaining the high-dispersion superfine spherical nickel powder. The application uses low-cost and low-pollution soluble nickel salt as a nickel source, establishes a limited micro-region reaction of aerosol, realizes controllable preparation of high-purity, high-sphericity, high-dispersity and uniform-morphology spherical nickel particles, effectively obtains the high-dispersion superfine spherical nickel powder under the conditions of low cost and low energy consumption, meets the requirements of high-dispersion superfine spherical nickel powder for various scale internal electrode slurries of MLCC, and has good fluidity, which is helpful to preparation of high-performance MLCC internal electrode slurry.

The application discloses high-purity sulfur-containing active nickel particles and a preparation method thereof. A nickel sulfur / nickel compound is added into a nickel melt, and refining is carried out under electromagnetic stirring to obtain a nickel sulfur melt. Then, the nickel sulfur melt is cast in a mold to obtain a high-purity nickel sulfur ingot. The ingot is subjected to hot isostatic pressing to obtain a compacted blank. The blank is cut according to the size of a finished product to obtain the high-purity sulfur-containing active nickel particles. The nickel sulfur / nickel compound is selected from one of a nickel block wrapped with a nickel sulfur compound, a nickel foil wrapped with a nickel sulfur compound and a nickel sintered body containing a nickel sulfur compound. The application adds sulfur into nickel by a specific method through vacuum induction smelting, and realizes preparation of a nickel sulfur ingot with high-purity composition, stable sulfur content and no segregation by combining with electromagnetic stirring in the whole process. Subsequently, a targeted processing technology is adopted according to the large brittleness of the nickel sulfur to complete batch production of the high-purity sulfur-containing active nickel particles. The preparation method is low in comprehensive cost, small in environmental pollution and suitable for industrialized production.

Embodiments of the present application relate to a high-nickel compound and a preparation method therefor. According to one embodiment of the present application, the high-nickel compound has a chemical general formula of LiaNixCoyMnzMbO2·cα·dβ, where 1≤a≤1.2, 0<b≤0.01, 0<c≤0.01, 0<d≤0.02, 0.8≤x≤1, 0≤y<0.12, 0≤z≤0.2, and x+y+z=1; M is a doping element; α is a first coating material, and β is a second coating material. Some other embodiments of the present application further provide a method for preparing a high-nickel compound. The high-nickel compound and the preparation method therefor provided by the embodiments of the present application can effectively solve the problems encountered in the traditional technology.

This invention discloses a method for preparing a nickel single-atom catalyst based on lignin-based activated carbon and its application in electrocatalytic CO2 reduction. The method uses lignin-based activated carbon as the carbon support, melamine as the nitrogen source, and a nickel-containing compound as the metal source. A process of doping followed by loading is employed to prepare the lignin-based activated carbon nickel single-atom catalyst. Application to electrocatalytic CO2 reduction revealed that, in H-type electrolytic cell tests, the catalyst exhibited high CO selectivity and CO bias current density across a wide potential range of -0.7 to -1.0 V vs RHE, demonstrating excellent catalytic activity. Compared to traditional catalysts, the carbon support used in this method is a renewable solid waste resource, resulting in low raw material costs and a simple and easy-to-operate preparation process. This method not only provides guidance for the application of lignin-based activated carbon in the field of electrocatalysis but also reduces the preparation cost of CO2 reduction electrocatalysts.