250results about "Phosphides" patented technology

The invention relates to the technical field of battery positive electrode materials, and provides a lithium iron phosphate positive electrode material and a preparation method thereof. The lithium iron phosphate positive electrode material has the characteristic of high energy density, the proportion of iron phosphide impurities in the total mass of the lithium iron phosphate positive electrode material is 0.001-0.008 PPM, the compaction density under the pressure of 3T is 2.68-2.8 g / cm < 3 >, the powder resistivity is 8-15 omega.cm, the 0.1 C discharge capacity is 161-163 mAh / g, the 0.1 C charge-discharge efficiency is 98.5-100%, and the 1C discharge capacity is 145-148 mAh / g. The preparation process is simple and safe, low in cost and high in stability. The content of iron phosphide impurities in a final lithium iron phosphate product can be regulated and controlled by regulating and controlling the phosphorus-iron ratio of the iron phosphate precursor and the ratio of the carbon source to the iron phosphate precursor in two-time burdening and controlling the sintering temperature in cooperation with secondary sintering, and the high-energy-density lithium iron phosphate positive electrode material is obtained.

The invention provides a sulfide solid electrolyte and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, carrying out dry ball milling treatment on raw materials Li2S, P2S5 and LiX according to a required stoichiometric ratio, so that the raw materials are amorphized; s2, adding a solvent into the non-crystallized raw material obtained in the step S1, and carrying out wet ball-milling treatment to obtain a precursor with the particle size of 0.05-0.5 mu m; s3, the solvent is removed from the precursor slurry, the sulfide solid electrolyte is obtained through solid-phase sintering, all the steps are carried out in an inert atmosphere, and X is a halogen element. According to the present invention, the non-crystallization of the raw material is achieved through the dry ball milling, the uniform precursor slurry with the small particle size is obtained by combining the wet ball milling, and the sub-micron / nano-scale pure phase electrolyte material can be obtained after the sintering treatment, such that the electrode / electrolyte interface contact is improved, the impedance is reduced, and the battery performance is significantly improved.

The invention provides a sodium ferric phosphate pyrophosphate-based composite material as well as a preparation method and application thereof, and relates to the technical field of sodium ion battery electrode materials. The composite material is of a core-shell structure and sequentially comprises a base material, a heterogeneous interface layer and a coating layer from inside to outside, the chemical formula of the base material is Na4Fex( PO4) 2P2O7, the heterogeneous interface layer is iron-based phosphide nanoparticles distributed on the surface of the base material, and the coating layer is a carbon layer; the iron-based phosphide is prepared from at least one of FeP and Fe2P; 3 < = x < = 4; iron-based phosphide nanoparticles are generated on the surface of the ferric sodium phosphate pyrophosphate material through in-situ reduction, a tightly-combined heterogeneous interface network is formed, the electron and ion transmission performance of the material is remarkably improved, and the rate performance is improved; the preparation method is simple and easy to implement on a large scale.

The application discloses a preparation method of carbon aerogel material for light electromagnetic shielding, and comprises the following steps: adding resorcinol, phloroglucinol, a template agent and formaldehyde into pure water, stirring and dissolving to obtain a precursor solution; adding the precursor solution into white oil containing a surfactant, emulsifying, heating in an oil bath and fully reacting; centrifugal separation to obtain powder, high-temperature carbonization, dispersion in oleylamine, addition into a stock solution containing nickel acetylacetonate, triphenylphosphine and oleylamine, high-temperature reaction and cooling, addition of a mixture of hexane and ethanol to obtain a product; centrifugal separation and washing to obtain light high-electromagnetic-shielding carbon aerogel. The carbon aerogel material for light electromagnetic shielding prepared by the method has the advantages of small density, high efficiency, corrosion resistance, high electromagnetic shielding efficiency, high product yield and the like, and by controlling the nucleation and growth rate of Ni2P, the Ni2P nanoparticles can be uniformly grown on the carbon aerogel microspheres, and the method is suitable for application in large-scale industrial production.

The present disclosure relates to the field of nanotechnology. The present disclosure provides a method for preparing nanostructures by fluoride passivation. The present disclosure also provides a method for preparing nanostructures by fluoride and amine passivation. The nanostructures have high quantum yields, narrow emission peak widths, tunable emission wavelengths, and colloidal stability. Nanostructures prepared using the method are also provided. Nanostructure films and molded articles including the nanostructures are also provided.

The invention provides a hollow cobalt phosphide catalyst for oxidation of 5-hydroxymethylfurfural and preparation of the hollow cobalt phosphide catalyst. A preparation method comprises the following steps: (1) dispersing ZIF-67 in an ethanol-water solution for reflux heating etching; and (2) carrying out low-temperature phosphorization on the ZIF-67 (at) Co (OH) 2 to obtain the hollow cobalt phosphide catalyst. The MOF-derived hollow cobalt phosphide catalyst disclosed by the invention is used for electrocatalytic oxidation of 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid, has a hollow structure, fully exposes Co sites, induces conversion to Co < 3 + > and Co < 4 + > to a greater extent, remarkably improves catalytic activity and promotes reaction kinetics. The synthesis method disclosed by the invention is simple, convenient, green and environment-friendly, solves the problem that the whole catalytic efficiency is limited due to the fact that phase change only occurs at Co sites on the surface and the interior is not fully utilized due to a compact microstructure of a traditional cobalt-based nano material, and has a good application prospect.

The invention discloses a preparation method and application of nickel-cobalt bimetallic phosphide for in-situ growth of nitrogen-doped carbon nanotubes. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; sequentially adding a cobalt source, a nickel source, a segmented copolymer, a phosphorus source and a nitrogen source into the graphene oxide dispersion liquid, and uniformly mixing to obtain a mixed solution; drying the mixed solution to obtain a precursor; and annealing the precursor in an inert atmosphere to obtain the product. According to the nitrogen-doped carbon material coated phosphide nano-particle composite material and the preparation method thereof, by regulating and controlling the ratio of Ni to Co, a carbon source grows on graphene in situ to form a carbon nano-tube, nickel-cobalt bimetal phosphide nano-particles are uniformly distributed on a nitrogen-doped carbon material to form the nitrogen-doped carbon material coated phosphide nano-particle composite material, and the nitrogen-doped carbon material coated phosphide nano-particle composite material is used as a modified diaphragm material of a lithium-sulfur battery. The preparation method disclosed by the invention has the advantages of mild reaction conditions and easiness in amplification and regulation, and the prepared composite material has a relatively high specific surface area and can be applied to the field of energy sources, especially the field of lithium-sulfur batteries.

The invention discloses a preparation method and application of nano-enzyme molecularly imprinted detection particles, a molecularly imprinted material is developed on the basis of a FeN3P nano-enzyme material, the molecularly imprinted material is fixed on filter paper to realize high-sensitivity and high-selectivity detection of 25-(OH) D3, real-time field detection of the molecularly imprinted material is realized by matching with a self-researched mobile phone APP: Visual Method, and the nano-enzyme molecularly imprinted detection particles have very high practical application value. Accurate data support is provided for early warning and personalized intervention of osteoporosis, community screening and long-term health management lack of 25 (OH) D3 can be promoted, and the method has important scientific value and social significance in reduction of the incidence rate of osteoporosis and optimization of medical resource allocation.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

To provide phosphorized cobalt-carbon composite particles having supported CoP.SOLUTION: A method for producing phosphorized cobalt-carbon composite particles includes: a step of impregnating cells in a treatment solution containing a cobalt compound and an organic solvent, in a state where the cells coexist with a phosphorus source selected from the group consisting of oxoacids of phosphorus and salts thereof; and a step of calcining the cells after the impregnation treatment. The amount of phosphorus constituting the phosphorus source is greater than the amount of phosphorus contained in the wild type of the cells.SELECTED DRAWING: None

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an energy storage device, the positive electrode material comprises first lithium iron phosphate particles and lithium iron phosphate-iron phosphide composite particles, based on the total number of the first lithium iron phosphate particles and the lithium iron phosphate-iron phosphide composite particles, the quantity percentage of the lithium iron phosphate-iron phosphide composite particles is a, and a is more than or equal to 3% and less than or equal to 30%; iron phosphide is fused in the lithium iron phosphate-iron phosphide composite particles, in the cross sections of the lithium iron phosphate-iron phosphide composite particles, the proportion of the area of iron phosphide in the total area of the cross sections is K, and K is larger than or equal to 10% and smaller than or equal to 60%.

The invention discloses a preparation method and application of a plasma-assisted gradient doped sulfide solid electrolyte, and belongs to the technical field of preparation of solid-state battery materials. According to the method, four-order synergistic processes of plasma activation, gradient doping, microwave sintering and supercritical purification are combined, atomic-scale mixing is achieved through plasma-assisted ball milling, a gradient Cl doping process is combined to optimize a crystal structure, energy consumption is reduced by 70% through microwave sintering, and the product purity is improved to 99.5% by adopting a supercritical carbon dioxide purification technology. The corollary equipment integrates a corrosion-resistant ball milling bin, a high-precision microwave module and an online detection system, and is suitable for large-scale production, the ionic conductivity reaches 6.4 mS / cm, the cycle performance is improved by 150%, the continuous production process only needs 3 h, and compared with the traditional process which needs more than 12 h, the efficiency is improved by 400%.

The present invention discloses a MOF-derived cobalt trioxide @ cobalt oxide @ cobalt diphosphide composite material and its preparation method and application, which belongs to the technical field of MOF-derived composite materials. It includes: the present invention synthesizes Co‑MOF‑74 by a hydrothermal method, then in-situ oxidation under an air atmosphere, and then in-situ partial phosphating under an argon atmosphere, and the obtained sample is Co3O4@CoO@Co2P composite photocatalyst. The advantage of the present invention is that the composite photocatalyst prepared with rod-shaped Co‑MOF‑74 as a template inherits the regular rod-shaped morphology and porous structure of the MOF precursor, provides more contact and reaction sites for surface charge and mass transfer in the photocatalytic reaction, and promotes the migration and separation of photogenerated carriers. The preparation process of the method of the present invention is simple, the reaction conditions are suitable, it is suitable for large-scale promotion, and has good application prospects in the fields of environment, energy, etc.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

The present application relates to the technical fields of wastewater purification and energy storage material, and discloses an energy storage carbon material, a preparation method and application thereof.The method comprises the following steps: carbonizing biomass waste enriched with metal ions to obtain an energy storage carbon material.The energy storage carbon material can be used to prepare a secondary metal / ion battery.The energy storage carbon material prepared by the present application can promote the uniform deposition of metal in the charging and discharging process, avoid the safety problems caused by dendrite growth, and at the same time, the metal ions in industrial wastewater can be used to prepare high-value-added secondary battery energy storage materials by means of a simple and low-cost method of biosorption.

The invention relates to the field of electrocatalysts, in particular to a simple preparation method of a Ni2P / Fe3P electrocatalyst and application of the Ni2P / Fe3P electrocatalyst in industrial hydrogen production. Nickel nitrate hexahydrate, ferric nitrate nonahydrate, dimethylacetamide, N, N-dimethylacetamide and deionized water are mixed under the stirring condition and subjected to a hydrothermal reaction to obtain a Fe1Ni1-MOF material, then the obtained Fe1Ni1-MOF material is placed in a tubular furnace to be phosphatized, the Ni2P / Fe3P catalyst is obtained, the preparation method is environmentally friendly and simple, the cost is low, the product is pure, and the method is suitable for industrial production. The method has certain stability and activity in an ampere-level industrial current scene, and has a good application prospect.

This invention provides a bamboo-like carbon nanotube with a heterostructure, its preparation method, and its applications. The preparation method includes: dissolving cobalt nitrate and heteropolyacid in ethanol to obtain a first solution; dissolving dicyandiamide in a mixed solution of ethanol and water to obtain a second solution; mixing phytic acid with the second solution uniformly and performing a polymerization reaction to obtain a third solution; adding the first solution to the third solution to perform a chemically induced self-assembly reaction, washing and drying to obtain a dicyandiamide-heteropolyacid-phytic acid-cobalt ion organic polymer; and calcining to obtain the bamboo-like carbon nanotube with a heterostructure. This method is simple and inexpensive; the Co2P and WN / MoN nanoparticles in the bamboo-like carbon nanotube are uniformly distributed in the carbon matrix, improving the electrochemical performance of the material; the introduction of dicyandiamide and phytic acid enables nitrogen and phosphorus doping of the carbon framework, improving the conductivity of the carbon support; and the resulting product exhibits high capacity and excellent cycle stability as a cathode material for metal-air batteries.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

The invention relates to the technical field of lithium-sulfur battery positive electrode materials, in particular to a metal organic framework-based porous cubic composite material and a preparation method and application thereof, the preparation method is simple, and the obtained composite material is applied to a positive electrode of a lithium-sulfur battery and can improve the discharge capacity and the initial efficiency. The preparation method comprises the following steps: (1) performing high-temperature treatment on a metal organic framework ZIF-67 at a first temperature in an inert gas atmosphere to obtain ZIF-67 after heat treatment; the first temperature ranges from 500 DEG C to 900 DEG C; (2) in an inert gas atmosphere, the ZIF-67 subjected to heat treatment is subjected to phosphating in the presence of a phosphating agent at a second temperature, so that Co in the ZIF-67 subjected to heat treatment is partially phosphated; the second temperature is 100 to 500 DEG C; and (3) grinding the product obtained in the step (2) to obtain the composite material.

The invention discloses a preparation method of FePS3, which comprises the following steps: mechanically mixing pyrite powder, sulfur-containing small molecules and elemental phosphorus, calcining the fully mixed powder in two temperature stages under a protective atmosphere, and cooling to obtain FePS3 nano-powder; wherein in the first temperature stage, the temperature is 200-300 DEG C, and the heat preservation time is 120-240 minutes, and in the second temperature stage, the temperature is 400-600 DEG C, and the heat preservation time is 120-180 minutes; the sulfur-containing small molecules are thiourea, thioacetamide or a mixture of the thiourea and the thioacetamide; the molar ratio of sulfur atoms to phosphorus atoms in FeS2 molecules and sulfur-containing small molecules in the pyrite powder is (1: 3: 5)-(1: 1: 5). According to the method, pyrite is used as an iron source and a sulfur source, sulfur-containing small molecules are used as a second sulfur source, and the FePS3 nano-powder is directly obtained through solid-phase reaction with the simple substance phosphorus without additional purification treatment. The method is low in solid-phase reaction temperature and simple in process, does not need harsh reaction conditions, and is easy for large-scale production.

The application discloses a kind of foam nickel load iron nickel bimetallic phosphide heterojunction catalyst and its preparation method and application, belong to electrocatalytic material technical field.The application is in situ grown by hydrothermal deposition in combination with low-temperature phosphorization process, and is prepared on foam nickel base Phosphide iron / Phosphide nickel heterojunction catalyst (Fe2P / Ni2P@NF).The prepared catalyst shows excellent performance in the electrocatalytic reduction of nitrate synthesis ammonia and high nitrate wastewater degradation.The preparation process of the catalyst of the application is simple, low in cost, and little to environmental pollution, and the self-supporting electrode prepared by integration can be directly applied to proton exchange membrane electrolytic cell, and has wide application prospect.

A semiconductor phosphide injection synthesis system and a control method are provided, which belong to the technical field of preparation of semiconductor phosphides. The semiconductor phosphide injection synthesis system includes a furnace body, a shielding carrier box arranged above the furnace body by virtue of a lifting mechanism, a phosphorus source carrier arranged in the shielding carrier box, an injection pipe arranged below the phosphorus source carrier, and a crucible arranged at an inner bottom of the furnace body in a matched manner. The phosphorus source carrier includes a phosphorus source carrier main body, a phosphorus source carrier upper cover, a heating element base arranged at an inner bottom of the phosphorus source carrier main body, and a heating element arranged on the heating element base; a heat insulation layer is wrapped on an outer wall of the phosphorus source carrier; and an induction coil is arranged between the heat insulation layer and an inner wall of the shielding carrier box. By improving a device and method, the system stability can be improved, and an entire synthesis system achieves quantitative synthesis, which lowers the risk of explosion of the phosphorus source carrier.

Process for producing boron hypophosphide B12P2 by self-propagating synthesis, comprising a step of mixing reactants in powder form followed by a step of initiating an exothermic reaction, the exothermic reaction being carried out in a closed chamber.

A compound represented by the Formula 1 and having an argyrodite-type crystal structure:LiaM1xM2wPSyM3z  Formula 1wherein M1 is at least one element of Group 2 or Group 11 of the periodic table, M2 is at least one metal element other than Li of Group 1 of the periodic table, M3 is at least one element of Group 17 of the periodic table, and wherein 4≤a≤8, 0<x<0.5, 0≤w<0.5, 3≤y≤7, and 0≤z≤2.

A quantum dot comprising a core comprising indium and having a first band gap; a first shell substantially surrounding the core, the first shell comprising a first semiconductor material having a second band gap that is greater than the first band gap; and a second shell substantially surrounding the first shell, the second shell comprising a second semiconductor material having a having a third band gap that is greater than the second band gap, wherein the first shell comprises three or more monolayers and less than or equal to twenty-two monolayers of the first semiconductor material; and liquid crystal displays comprising the same.

The application is suitable for the technical field of nanometer material synthesis and application, and provides a preparation method of crystalline PdCN@amorphous PdP core-shell nanoparticles, which comprises the following steps: polyvinylpyrrolidone, L-ascorbic acid and potassium bromide are added into deionized water to form a mixed solution, after preheating of an oil bath, sodium chloropalladate solution is injected, and then transferred to the oil bath for reaction, and after centrifugation and cleaning, cubic Pd nanoparticles are obtained; the cubic Pd nanoparticles are dissolved in dimethyl sulfoxide solution, transferred to a reaction kettle for reaction, and after centrifugation and cleaning, cubic PdCN nanoparticles are obtained; the cubic PdCN nanoparticles are mixed with oleylamine solution, and after adding trioctylphosphine solution and heating, centrifugation and cleaning, the crystalline PdCN@amorphous PdP core-shell nanoparticles are successfully obtained. The reagents used in the application can be purchased on the market and do not need further treatment, the preparation method is simple, and the required equipment is all basic laboratory equipment, without expensive equipment and instruments.

The present invention relates to a solid electrolyte comprising sulfide-based solid electrolyte particles and a lithium-metal-oxide located on the surface of the particles, wherein the half-width of the main peak in an X-ray diffraction analysis of the solid electrolyte is 0.160 or less, and a method for producing the same.

To provide tin phosphide with reduced ignition properties. [Solution] The tin phosphide is such that when 3 mL of tin phosphide is placed on an insulating plate and a cerium-iron spark is applied to the tin phosphide 1 to 50 times from a distance of 5 mm, no ignition is observed, the ratio of tin to phosphorus (Sn / P by weight) is 8.4 to 13.3, and it substantially does not contain elemental phosphorus and / or phosphorus-rich tin phosphide.

Method for producing boron subphosphide B 12 P 2 by self-propagating synthesis, the method comprising a step of mixing reactants, in the form of powders, followed by a step of initiating an exothermic reaction, the exothermic reaction being carried out in a closed chamber.

To provide a method for synthesizing Pt(PF3)4 used as a precursor for a film-forming composition.SOLUTION: A method for synthesizing Pt(PF3)4 comprises: forming a suspension in a solvent of a platinum precursor Pt(Hal)2 (wherein Hal=F, Cl, Br, or I) and metal powder; introducing an excess amount of PF3 into the suspension of Pt(Hal)2 and the metal powder; forming a soluble reaction intermediate Pt(Hal)2(PF3)x in the solvent through a reaction between PF3 and Pt(Hal)2 (wherein Hal=F, Cl, Br, or I; x=1, 2) under a reaction condition; and forming Pt(PF3)4 through a reaction between Pt(Hal)2(PF3)x, the metal powder, and the excess amount of PF3 in the solvent.SELECTED DRAWING: Figure 2a