969 results about "Mixed metal" patented technology

The invention provides an in-situ modified lithium-rich manganese-based precursor and a preparation method and application thereof.The preparation method comprises the following steps that a nickel-cobalt-manganese mixed metal salt solution, a precipitator solution and a complexing agent solution are introduced into a base solution for a first coprecipitation reaction, and after the first coprecipitation reaction is finished, feeding is stopped; and introducing a doped nickel-cobalt-manganese mixed metal salt solution, a precipitant solution, a complexing agent solution and a carbon source solution into a system after the first coprecipitation reaction is finished, and carrying out a second coprecipitation reaction to obtain the in-situ modified lithium-rich manganese-based precursor. According to the preparation method, doping elements and a carbon source are introduced when the lithium-rich manganese-based precursor is prepared through the coprecipitation reaction, in-situ uniform construction of oxygen vacancies and a carbon coating layer on the surface of the material is synchronously achieved, the in-situ modified lithium-rich manganese-based precursor is obtained, the treatment step of subsequent secondary coating can be reduced, the production cost can be reduced, and the method is suitable for industrial production. The technological process is shortened.

The invention relates to the technical field of battery materials, in particular to a ternary precursor, a preparation method thereof and a ternary positive electrode material. The preparation method of the ternary precursor comprises the following steps: preparing a mixed metal salt solution containing a nickel source, a cobalt source and a manganese source; the mixed metal salt solution, alkali liquor and a complexing agent are added into the base solution for a coprecipitation reaction, and the coprecipitation reaction comprises the steps that a nucleation reaction is conducted when the pH value of a reaction system ranges from 12 to 13, and then the pH value is gradually reduced to 11 or above along with the growth reaction till product particles reach the target particle size, in the process of gradually reducing the pH value to 11 or above, at least two times of pH value constant time exist, and the pH value constant time of one time is 40 hours or above; and carrying out solid-liquid separation on the product after the coprecipitation reaction is finished to obtain the ternary precursor. According to the preparation method, the ternary precursor material which is narrow in span distribution, small in particle and stable can be obtained.

The invention relates to methods for synthesizing an engineered adsorbent suitable for the selective extraction of lithium from brine solutions. The invention describes the advantages of introducing mixed metal oxides into the crystal lattice of anatase titania precursor. The invention offers significant advantages, including high adsorption capacity of the ion sieve, enhanced chemical stability of the sorbent, and higher lithium selectivity.

The invention relates to the technical field of solar cells, in particular to a back contact solar cell, a preparation method thereof and a cell assembly, a mixed metal electrode structure is adopted, a fine gate electrode in an overlapping area of a main gate electrode and the fine gate electrode is removed, and a metal composite layer below the fine gate electrode is used for replacing a traditional fine gate electrode, so that the back contact solar cell is obtained. A cross structure in space between the fine gate electrode and the main gate electrode is avoided, poor short circuit caused by insufficient effective insulation thickness is reduced, improvement of the yield of the battery is facilitated, meanwhile, the discontinuous length of the fine gate electrode and the width of the main gate electrode are limited, a more abundant error range is provided for welding of a welding strip, and the welding quality of the battery is improved. By limiting the ratio of the thickness of the composite conductive layer to the width of the composite conductive layer in the first direction, the linear resistivity of the composite conductive layer is guaranteed, and extra power loss caused by too high resistivity is avoided; a fine gate electrode is replaced by the flat composite conductive layer, so that the thickness of the insulating layer is greatly reduced, and the material cost of the insulating layer is saved.

The invention discloses a metal oxide modified high-entropy alloy catalyst and a preparation method and application thereof, the metal oxide modified high-entropy alloy catalyst is a supported Ni-Ga-Cu-In-Zn-Fe high-entropy alloy catalyst with a mixed metal oxide of X, Mg and Al as a carrier, the metal X is Zr or Ce, preferably Zr; the catalyst is prepared through a one-step precipitation method, a co-precipitation and impregnation method or a two-step precipitation method by utilizing the characteristic that main body laminate composition and elements of a layered hydroxide (LDHs) material are adjustable; the metal oxide modified high-entropy alloy catalyst has the characteristics of high catalyst metal particle dispersity, high catalytic activity, good selectivity and long service life due to the introduction of ZrO2 or CeO2, and can reach a higher CO2 conversion rate in a relatively low temperature interval, so that the CO2 conversion rate and the single-pass yield of methanol are remarkably improved, and the catalyst has the advantages of low cost and high efficiency. Therefore, the utilization efficiency of carbon resources is improved, and the method has a good industrial application prospect.

Cu-based catalysts with excellent thermal stability for selective hydrogenation and a preparation method thereof are provided. The method includes: first, six mixed metal salts are instantaneously nucleated in an alkaline solution by the nucleation / crystallization isolation method, to prepare high-entropy composite metal hydroxides (H-LDHs) with uniform element distribution and similar metal proportions. Furthermore, well-crystallized high-entropy oxides (HEOs) are obtained based on the structural topology characteristics of H-LDHs, and a series of Cu-Mx / HEOs catalysts with flexible adjustable catalytic microzone geometries and electronic structures are obtained using the HEOs as precursors.

A method of producing a particulate lithium mixed metal oxide cathode material comprising the steps of providing an organic compound, having a melting point above 50° C., providing a lithium compound, providing two or more metal compounds, mixing the organic compound, the lithium compound, and the two or more metal compounds to form a mixture, calcining the mixture at a calcining temperature, in an atmosphere containing oxygen to combust the organic compound and to form a lithium mixed metal oxide, cooling the lithium mixed metal oxide to below 60° C., and sizing the cooled lithium mixed metal oxide to produce particulate lithium mixed metal oxide having a predetermined average particle size.

The invention discloses a low-cost Ir-Sn oxide electro-catalytic anode, which is prepared by the following steps: pretreating a titanium substrate to form a rough structure with uniform overall distribution on the surface of the titanium substrate, then coating a mixed metal salt solution of titanium and tantalum on the surface of the titanium substrate, and preparing an intermediate layer with a compact structure by using a thermal decomposition method, thereby obtaining the low-cost Ir-Sn oxide electro-catalytic anode. And finally, circularly coating the surface of the intermediate layer with a noble metal salt solution, and performing high-temperature sintering to form a noble metal oxide catalyst layer. In the precious metal salt solution used by the electrocatalytic anode, the use amount of precious metal with high cost is relatively low, and the production cost can be greatly reduced on the premise of ensuring the electrocatalytic performance and the service life.

The invention discloses a composite aluminum plate with an embedded mixed melting layer microstructure and a cast-rolling preparation method of the composite aluminum plate, and belongs to the technical field of aluminum alloy material preparation, the composite aluminum plate comprises a coating aluminum alloy, a matrix aluminum alloy and an embedded brazing flux mixed melting layer, the coating aluminum alloy is connected with the matrix aluminum alloy through the embedded brazing flux mixed melting layer, and the matrix aluminum alloy is connected with the embedded brazing flux mixed melting layer. The pre-embedded brazing flux mixed melting layer is a controllable mixed metal layer formed by mixing pre-embedded brazing flux metal and a fusion layer formed by a solid-liquid cast rolling process, the cast rolling preparation method is a coating-cast rolling combined preparation method, and the method has the advantages of being short in process, high in production efficiency, high in pre-embedded layer control precision and the like, and large-scale production of products is facilitated.

The invention discloses a high-entropy alloy system high-temperature brazing filler metal and a preparation method and application thereof, and relates to the technical field of welding materials.The preparation method comprises the following steps that iron powder, cobalt powder, nickel powder, copper powder and molybdenum powder are weighed and evenly mixed, and mixed metal powder is obtained; the mixed metal powder is put into a first ball milling tank, argon is introduced, ball milling is conducted for at least 15 h, and alloyed powder is obtained; the alloyed powder is put into a mold and sintered in the hydrogen atmosphere at the temperature of 1000-1200 DEG C, and a sintered blank is obtained; the sintered briquette is crushed into particles, the particles are put into a second ball milling tank, ball milling is conducted for at least 20 h in the argon atmosphere, and high-entropy alloy powder is obtained; and weighing the high-entropy alloy powder, borax and polyvinyl alcohol, and uniformly mixing to obtain the high-entropy alloy system high-temperature brazing filler metal. The prepared high-entropy alloy system high-temperature brazing filler metal has the advantages of being good in component uniformity, high in performance stability and excellent in wettability and filling performance, and the welding quality of a brazed joint can be effectively guaranteed.

The present disclosure includes mixed metal catalysts, including electrocatalysts, which can be applied to reduce the need for Ir, while exhibiting desirable performance. Mixed metal electrocatalyst materials on the invention catalysts comprising Ir, Ru and Pd, catalysts comprising Ru and Pd, and catalysts comprising Ir and Pd.

An engineered adsorbent for the selective extraction of lithium from brine solutions. Mixed metal oxides are introduced into the crystal lattice of anatase titania precursor. The invention offers significant advantages, including high adsorption capacity of the ion sieve, enhanced chemical stability of the sorbent, and higher Lithium selectivity.

The invention provides a lithium manganese iron phosphate precursor and a preparation method thereof, lithium manganese iron phosphate, a lithium ion battery and electric equipment, and relates to the technical field of new energy. Primary particles of the lithium manganese iron phosphate precursor provided by the invention are thick-sheet-shaped, the side surfaces of the primary particles are porous, the large-size primary particles and the porous lithium manganese iron phosphate precursor have many defects, are easy to grind and have excellent processability, Li < + > is easier to react with manganese iron phosphate in the sintering process to generate lithium manganese iron phosphate with high sphericity degree, the compaction density is high, and the lithium manganese iron phosphate precursor has good performance. No other impure phase is generated, and the capacity and the rate capability are good. According to the preparation method of the lithium manganese iron phosphate precursor provided by the invention, the ammonium manganese iron phosphate hydrate with large-size primary particles can be generated by adding excessive phosphorus sources into the mixed metal salt solution. Furthermore, pyrophosphorylation is generated through high-temperature calcination, a large number of air holes are generated, and finally the porous lithium iron manganese phosphate precursor is generated.

The invention relates to a positive electrode material precursor with a stable structure and a preparation method and application thereof.The preparation method comprises the following steps that a metal salt solution, ammonia water, a complexing agent solution and a precipitator solution are mixed in a base solution in a parallel flow mode, a co-precipitation reaction is conducted, and the positive electrode material precursor with the stable structure is obtained; a complexing agent in the complexing agent solution comprises ammonia water and organic acid, and the molar ratio of ammonium radicals in the ammonia water to carboxyl groups in the organic acid is (0.1-5): 1. According to the preparation method of the positive electrode material precursor provided by the invention, by using the specific complexing agent solution, the crystal face size of the obtained positive electrode material is adjusted, and the crystal structure of the obtained positive electrode material precursor is optimized, so that the crystal structure stability of the corresponding positive electrode material is improved.

Mixed metal metal-organic frameworks (MM-MOFs) of copper-1,3,5-benzenetricarboxylate (BTC), M-Cu-BTC, wherein M is Zn(II), Ni(II), Co(II), and / or Fe(II) may be made using post-synthetic exchange (PSE) with metal ions. Such MM-MOFs may be used in H2 storage, especially Ni(II) and Co(II) MM-MOFs. Selected metal exchanged materials can provide gravimetric H2 uptake around 1.63 wt. % for Zn—Cu-BTC, around 1.61 wt. % for Ni—Cu-BTC, around 1.63 wt. % for Fe—Cu-BTC, and around 1.12 wt. % for Co—Cu-BTC.

The invention discloses iridium series mixed metal oxide titanium anode plate welding equipment, and relates to the technical field of welding equipment, the iridium series mixed metal oxide titanium anode plate welding equipment comprises a welding rack, a welding mechanism and an anode plate clamp, and the welding rack comprises adjustable supporting legs. The equipment stability is ensured through the adjustable supporting feet and the workbench structure, the anode plate clamp is matched with the first servo motor and the second servo motor on the portal frame to drive the threaded rod and the adjusting sliding block structure, the welding mechanism can be accurately positioned on the X / Y axis, flexible adjustment of a three-dimensional space welding path is achieved in combination with Z-axis downward pressing control of the telescopic cylinder, and the welding efficiency is improved. The integration of the process database and the touch display screen simplifies the parameter calling process, the microcontroller feeds back welding data in real time through the visual monitoring assembly, the consistency of the welding quality is effectively guaranteed, the protection assembly reduces the harm of intense light radiation to operators, and then the automation efficiency and safety are improved. And the titanium anode plate welding efficiency and the finished product qualification rate are remarkably improved.

The invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

The invention discloses a hydrophilic carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. Comprising the following steps: 1) adding a hydrophilic carbon-based material and mixed metal salt into an ethylene glycol solution, and ultrasonically mixing uniformly to obtain a reaction solution; and 2) heating an ethylene glycol solution to 200-240 DEG C through an oil bath, then slowly adding the reaction liquid prepared in the step 1) into the ethylene glycol solution, carrying out heating treatment for 0.5-2 hours, cooling, and centrifuging to prepare the carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst. The prepared hydrophilic carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst has high activity, and generated hydrogen bubbles are smaller and can be separated from the surface of an electrode more easily.

The invention relates to the technical field of batteries, and discloses a pre-lithiated positive electrode precursor and a preparation method thereof, a positive electrode material, a positive electrode plate and a battery. The preparation method of the pre-lithiated positive electrode precursor comprises the following steps: preparing a mixed metal salt solution containing a nickel source, a manganese source and an M metal source; carrying out spray pyrolysis treatment on the mixed metal salt solution to obtain a spray pyrolysis precursor; and mixing the spray pyrolysis precursor with a first lithium source, and carrying out first sintering treatment to obtain the pre-lithiated positive electrode precursor. The lithium element is introduced into the core body of the precursor material through pre-lithiation, growth of precursor crystal grains is promoted, the lithium element has high reaction activity, oxidation and rearrangement of metal ions can be promoted, formation of a more compact oxide structure is facilitated, the size of the crystal grains is increased, hollowing is reduced, and the performance of the material is improved. Therefore, the tap density of the spray pyrolysis positive electrode precursor is improved.

The invention relates to an iron-containing precursor and a preparation method and application thereof.The preparation method comprises the steps that a mixed metal salt solution is prepared, the mixed metal salt solution at least contains ferrous ions and a reducing agent, and the mass ratio of the ferrous ions to the reducing agent is 50: 1-100: 1; a complexing agent and water are mixed to serve as a base solution, a mixed metal salt solution, the complexing agent and a precipitator are added into the base solution, and a first-stage reaction, a second-stage reaction and a third-stage reaction are sequentially carried out; the volume percentages of the added complexing agent in the added mixed metal salt solution are X1, X2, X3 and X1lt respectively; x2lt; x1 / X3 is more than or equal to 0.65 and less than or equal to 0.75; and after the third-stage reaction is completed, preparing an iron-containing precursor. According to the method, a traditional batch method is optimized, the stability and repeatability of production batches are improved, and the prepared precursor is narrow in particle size distribution, uniform in morphology and high in sphericity degree.

An engineered adsorbent for the selective extraction of lithium from brine solutions. Mixed metal oxides are introduced into the crystal lattice of anatase titania precursor. The invention offers significant advantages, including high adsorption capacity of the ion sieve, enhanced chemical stability of the sorbent, and higher Lithium selectivity.

The invention provides a method for synthesizing a nanoscale single crystal lithium-rich manganese-based positive electrode material by a molten salt method. The method comprises the following steps: 1, sequentially pouring deionized water and a complexing agent aqueous solution into a continuous stirred tank reactor; 2, pumping a mixed metal salt solution of a nickel source, a cobalt source and a manganese source and a precipitator, continuously stirring at a certain temperature, aging, and carrying out suction filtration, washing and drying to obtain a carbonate precursor; and 3, mixing the carbonate precursor and a lithium source according to a certain stoichiometric ratio, adding molten salt, and calcining and washing the powdery mixture to obtain the nano-scale single-crystal lithium-rich manganese-based positive electrode material. According to the method, the nanoscale single crystal particles can be directly formed, so that the Li < + > diffusion distance is effectively shortened, the influence of a grain boundary on lithium ion diffusion is avoided, and the electrochemical reaction active area is increased; and the material also has a more favorable microstructure, and material structure deterioration caused by an electrochemical-mechanical effect in a battery cycle process is relieved.

The invention discloses a preparation method of a novel mixed metal oxide coating titanium electrode, and relates to the technical field of electrode preparation, the method comprises the following specific steps: titanium substrate pretreatment: a titanium plate is sequentially subjected to gradient polishing with 120-800-mesh abrasive paper, the polished titanium substrate is subjected to hydrochloric acid solution etching, argon plasma surface activation and drying treatment, and a titanium substrate is obtained; obtaining a clean substrate surface with proper roughness; through the low-temperature plasma treatment, pulsed bias magnetron sputtering and laser-induced atomic layer deposition (LA-ALD) combined technology, the binding force of the coating and the titanium substrate is remarkably improved, high-energy particles are used for bombarding the surface of the titanium substrate in the low-temperature plasma treatment, residual impurities are effectively removed, the surface roughness and active sites are increased, and the surface hardness of the titanium substrate is improved. In the pulsed bias magnetron sputtering process, the surface of the substrate is further cleaned through periodic ion bombardment, atomic diffusion and mixing between the coating and the substrate are promoted, a transition layer structure is formed, and therefore the binding force is greatly enhanced.

Acrolein is produced by selectively oxidizing allyl alcohol over a first mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The first mixed metal oxide catalyst comprises oxides of molybdenum and bismuth. Acrylic acid is produced by selectively oxidizing the acrolein over a second mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The second mixed metal oxide catalyst has a different composition from the first mixed metal oxide catalyst.

The invention discloses an ultrahigh-temperature multi-element iridium alloy material and a preparation method thereof, and belongs to the technical field of alloy materials. The iridium alloy material comprises the following elements in percentage by mass: 53 to 58.5 percent of Ir, 40 percent of Ta, 0.5 to 2 percent of Y and 1 to 5 percent of Re. The preparation method of the iridium alloy material comprises the following steps: weighing Ir, Ta, Y and Re metal powder in proportion and uniformly mixing; blank pre-pressing treatment is conducted on the evenly-mixed metal powder, the metal powder is die-cast into a block, and a pressed blank is obtained; the pressed blank is smelted through an electric arc smelting method, and an iridium alloy crude product is obtained after smelting is finished; and the smelting is repeated for more than 7 times, so that the pressed blank is uniformly smelted, the content of each component reaches the standard, and the iridium alloy material is prepared. According to the iridium alloy material, through the synergistic effect of multiple elements and the preparation technology, the triple effects of structural distortion strengthening, high-temperature stability and oxidation film integrity are achieved. And due to the high mixed entropy, a similar high-entropy alloy structure is formed, the high-temperature oxidation resistance is remarkably improved, and the alloy is suitable for various ultra-high-temperature environments.

Methods and systems for sorting mixed metal scrap may first determine a sorting attribute of each article of metal scrap, and subsequently mark each article with a machine-readable or visually identifiable mark according to the sorting attribute. The articles of mixed metal scrap can be sorted along a high throughput conveyance using a series of sensors to scan the articles for the machine-readable marks, and rapidly sorting marked articles to appropriate sorting destinations based on detecting the machine-readable marks, and without requiring repeat identification by metal analyzers at the sorting step.

The invention discloses a method for separating Li / Co / Mn / Ni in a mixed metal solution and application of the method, and belongs to the technical field of resource recovery. The method comprises the following steps: extracting transition metal ions in a mixed metal solution by using a solution containing an extracting agent D2EHPA to obtain a loaded organic phase B and a raffinate phase C; the volume percentage of the extracting agent D2EHPA solution is 5%-30%; carrying out reverse extraction on the loaded organic phase B to obtain a reverse extraction phase D; extracting the reverse extraction phase D by using a solution containing an extracting agent P507 to obtain a raffinate phase E and a loaded organic phase F; the volume percentage of the extracting agent P507 solution is 50-90%; and adjusting the pH value of the raffinate phase E to 9-10, and extracting the raffinate phase E by using a solution containing an extracting agent Cyanex 272 to obtain a raffinate phase H and a loaded organic phase I. According to the method, the metal recovery rate is high, the purity is high, and Li, Co, Mn and Ni resources in the aqueous solution can be comprehensively recovered.

A spinel-structured multi-component composite oxide catalyst comprises active metals and base metals, and the active metals are 2-5 of iron, cobalt, nickel, ruthenium, molybdenum, manganese, platinum, palladium and chromium; the base metal is a composite metal oxide formed by two or three mixed metals of magnesium, aluminum, zinc, manganese, iron, cobalt, titanium, chromium and nickel; the particle size of the active metal particles is 2-50 nanometers, more preferably 2-20 nanometers. The catalyst has the characteristics of high transition metal content, uniform active site distribution, small crystal grain, large specific surface area, sintering inhibition, good stability and the like, and high-magnification synthesis of carbon nanotube powder is realized by cracking hydrocarbon carbon source gas.

The invention discloses a high-entropy lithium-rich manganese-based layered oxide porous nanofiber and a preparation method and application thereof. The chemical formula of the high-entropy lithium-rich manganese-based layered oxide porous nanofiber is Li{Li 0.2 Mn a Ni b Co c Al d TM 0.8‑a‑b‑c‑d}O2; its preparation method is as follows: S1, dissolving polyacrylonitrile and polymethyl methacrylate in dimethylformamide to obtain a polymer solution; S2, dissolving lithium salt, manganese salt, nickel salt, cobalt salt, aluminum salt and TM salt in dimethylformamide to obtain a mixed metal salt solution; S3, adding the mixed metal salt solution to the polymer solution to obtain an intermediate mixed solution; S4, using the intermediate mixed solution to obtain a precursor nanofiber by a high-voltage electrostatic spinning method; S5, calcining the precursor nanofiber, and cooling to obtain a high-entropy lithium-rich manganese-based layered oxide porous nanofiber. The high-entropy lithium-rich manganese-based layered oxide porous nanofiber is used to prepare a positive electrode material for lithium-ion batteries.

The invention discloses a solder for a copper-clad ceramic substrate. The solder comprises mixed metal powder and an organic carrier, the mixed metal powder is composed of Cu powder, titanium powder, nickel powder and nano CeO2; the organic carrier is prepared from the following components in percentage by weight: 2 to 5 weight percent of organic thickening agent, 3 to 18 weight percent of organic mixed solvent and 0.2 to 3 weight percent of degreasing accelerant; the solder is formed by mixing mixed metal powder and an organic carrier according to the mass ratio of 85: 15-90: 10. An existing soldering paste formula is optimized, the degreasing accelerant is added, the degreasing capacity of the soldering paste is improved, and the porosity after brazing is reduced.