508results 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 relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

The present invention discloses a preparation method and application of a sulfide solid electrolyte material. The electrolyte has a Li6PS5Cl-type structure, and its chemical general formula is Li6Nb 1‑a P a S5X(0

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 provides novel compositions of matter and a robust one-pot process to produce solid-state electrolytes, metal sulfides, and / or metal phosphates. The metal sulfides include argyrodite-type sulfide electrolyte, and the metal phosphates include lithium phosphate.

The invention discloses a preparation method of a high-entropy phosphide nanotube, which successfully prepares a nanotube phosphide with a high-entropy structure by adopting a hydrogen bond organic framework (HOF)-metal organic framework (MOF) template conversion method. In the preparation process of the material, a core-shell structure (HOF (MOF)) is firstly formed, the core gradually disappears through a diffusion mechanism, and finally, the material is converted into a hollow nanotube structure which is uniform and controllable in size. According to the hollow structure, the specific surface area is remarkably increased, more active sites are provided, the transmission path of reactant molecules is optimized, and the electro-catalytic performance is greatly improved. Besides, the overall tubular morphology of the material is uniform, the size is controllable, and compared with a traditional granular material, the specific surface area is remarkably increased, so that more reaction sites are exposed in the external environment, and the catalytic efficiency and the reaction rate of the material in an electro-catalytic reaction are greatly improved.

Provided is a semiconductor nanoparticle complex composition and the like in which a semiconductor nanoparticle complex is dispersed at a high concentration and which has high fluorescence quantum yield. A semiconductor nanoparticle complex composition in which a semiconductor nanoparticle complex is dispersed in a dispersion medium, wherein: the semiconductor nanoparticle complex has a semiconductor nanoparticle and a ligand coordinated to the surface of the semiconductor nanoparticle; the ligand includes an organic group; the dispersion medium is a monomer or a prepolymer; the semiconductor nanoparticle complex composition further includes a crosslinking agent; and a mass fraction of the semiconductor nanoparticle in the semiconductor nanoparticle complex composition is 30% by mass or more.

The invention provides a preparation method of a molybdenum phosphide / titanium nitride composite material and a battery positive electrode material and a lithium-carbon dioxide battery, and belongs to the technical field of new energy materials. And then a titanium nitride conductor layer is deposited on the molybdenum phosphide by using an atomic layer deposition technology to prepare the molybdenum phosphide / titanium nitride, the molybdenum phosphide is combined as a transition metal phosphide to have stable catalytic performance, and the titanium nitride is used as a conductor to have excellent conductivity. The lithium-carbon dioxide battery positive electrode catalyst with high catalytic activity, high conductivity and excellent stability is obtained through the synergistic effect of the two materials, and when the lithium-carbon dioxide battery positive electrode catalyst is applied to a lithium battery, higher energy density, longer cycle life and better rate capability are shown, so that the overall performance of the battery is improved, and the application prospect is wide. The requirements on high-performance batteries in the fields of electric automobiles, energy storage systems and the like are met.

The invention provides a sea urchin-shaped FeP-coated NC composite material and a preparation method and application thereof, the composite material is formed by wrapping internal FeP nanoparticles with an external nitrogen-doped carbon layer, and presents a unique sea urchin-shaped structure; the preparation method comprises the following steps: preparing a FeOOH precursor by a hydrothermal method, adding the FeOOH precursor into a Tris buffer solution for ultrasonic dispersion, adding dopamine into the solution, stirring for a long time at normal temperature, separating, washing, and drying to obtain FeOOH (at) PDA; carrying out phosphating treatment on FeOOH-coated PDA and sodium hypophosphite at two ends of a porcelain boat according to a certain mass ratio in an atmosphere full of Ar to obtain a FeP-coated NC composite material; as a sodium ion battery negative electrode material, the composite material shows excellent electrochemical performance, and the specific capacity of 174.5 mAh g <-1 > can still be kept after 200 times of circulation under the current density of 2A g <-1 >, so that the material has the electrochemical performance with higher application potential.

The invention relates to the technical field of electrolyzed water catalytic electrodes, in particular to a bifunctional electrolyzed water catalytic electrode with carbonized wood as a substrate and a preparation method and application thereof.The preparation method comprises the steps that 1, wood chips are cleaned and then placed in a tubular furnace to be carbonized at the high temperature in the argon atmosphere, and three-dimensional porous carbonized wood is obtained; 2) dispersing a nickel source, an iron source and a molybdenum source in a solvent, magnetically stirring to obtain a mixed solution, and adding sodium citrate dehydrate to adjust the pH value of the solution to 7; (3) transferring the carbonized wood and the mixed solution into a high-pressure reaction kettle, and carrying out hydrothermal reaction at 160 DEG C; and 4) placing the obtained sample in a tubular furnace for gas phase phosphorization, then repeatedly washing with deionized water and absolute ethyl alcohol, and carrying out vacuum drying to obtain the three-dimensional porous self-supporting framework uniformly and firmly loaded nickel iron molybdenum phosphide difunctional water electrolysis catalytic electrode, the combination of the framework and particles enables the catalytic electrode to have excellent HER and OER electro-catalytic performance and stability, and the catalytic electrode has good application prospects. And the preparation method is simple, efficient, low in cost and suitable for large-scale production and application.

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 present invention discloses a high entropy metal sulfur phosphide electrolyte material and a preparation method thereof, wherein the high entropy metal sulfur phosphide electrolyte material is obtained by sintering a raw material containing A, B, P and X elements, wherein A is selected from at least one metal element in IA and / or IIA, B is selected from at least four transition metal elements, or B is selected from at least three transition metal elements and at least one main group metal element or metalloid element, P is a phosphorus element, X is selected from at least one non-metallic element in VIA, and the molar ratio of A to B is between (1 to 4): (4 to 1). The high entropy metal sulfur phosphide electrolyte material prepared by the present invention has high electrical conductivity, and shows a significant improvement in electrical conductivity compared to existing transition metal sulfur phosphorus compounds, can meet the needs of actual solid-state battery applications, and has excellent thermal stability, and has great application potential in the field of solid-state energy storage devices.

The invention is applicable to the technical field of synthesis and application of nano materials, and provides a preparation method of crystalline PdCN / amorphous PdP core-shell nanoparticles, which comprises the following steps: adding polyvinylpyrrolidone, L-ascorbic acid and potassium bromide into deionized water to form a mixed solution, preheating an oil bath pan, injecting a sodium chloropalladate solution, and stirring to obtain a mixed solution; transferring into an oil bath pan to react, centrifuging and cleaning to obtain cubic Pd nano-particles; dissolving in a dimethyl sulfoxide solution, transferring into a reaction kettle for reaction, centrifuging and cleaning to obtain cubic PdCN nanoparticles; and mixing the cubic PdCN nano-particles with an oleylamine solution, adding a trioctylphosphine solution, heating, centrifuging and cleaning to successfully obtain the crystalline PdCN and amorphous PdP core-shell nano-particles. Reagents used in the method can be purchased on the market and do not need to be further treated, the preparation method is simple, needed equipment is basic laboratory equipment, and expensive equipment and instruments are not needed.

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.

Ternary heterostructure comprising Ni2P, MoNiP2, and MoP, wherein the ternary heterostructure comprises crystalline regions and amorphous regions useful as an electrocatalyst for alkaline hydrogen evolution reaction; a cathode and an electrochemical cell including the same; and methods of preparation and use thereof.

The invention provides a preparation method, a product and application of a flower-shaped carbon-based Mn-doped NiCoP thin film electrode material, and belongs to the technical field of electrochemistry. According to the flower-shaped carbon-based Mn-doped NiCoP thin film electrode material, a three-dimensional walnut shell derived porous carbon-based Mn-doped NiCo precursor is deposited and prepared on a growth substrate through a hydrothermal deposition method, then the three-dimensional walnut shell derived porous carbon-based Mn-doped NiCo precursor is subjected to phosphorization through a gas-solid reaction method, and WSC-N / O and Mn elements are introduced in the preparation process. Compared with the prior art, the preparation method has the advantages that the electrochemical activity and the electronic conductivity are enhanced, so that rapid transmission of electrons is realized, the electrochemical performance of the electrode material is improved, and the electrode material is further applied to preparation of high-performance supercapacitors and aqueous zinc ion batteries and shows excellent energy density. The electrode material provided by the invention provides a new method for designing and manufacturing a high-performance energy storage device.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material. The composite positive electrode material is composed of a positive electrode base material, a lithium supplementing material and a catalytic material. The preparation method comprises the following steps: (1) preparing a composite material of the positive electrode base material and the lithium supplementing material in situ; and (2) dispersing the catalytic material on the surface of the composite material of the positive electrode base material and the lithium supplementing material, and forming a stable interface layer between the catalytic material and the lithium supplementing material. According to the method disclosed by the invention, the lithium supplementing material has double functions of surface modification of a positive electrode base material and lithium supplementing of a negative electrode, and meanwhile, the first effect and the cycling stability of the battery are improved; a catalytic material is introduced to the surface of the lithium supplementing material, free O generated by the lithium supplementing material Li is fixed in situ, the bag expansion phenomenon of the battery is relieved, and the cycling stability and safety of the battery are further improved; the preparation process is simple, raw materials are cheap and easy to obtain, the production cost is low, and industrial production and popularization are easy.

The invention discloses a metal phosphide modified lithium-rich manganese-based positive electrode material and a preparation method and application thereof, the lithium-rich manganese-based positive electrode material comprises a metal phosphide and a lithium-rich manganese positive electrode base material, the metal phosphide is doped in the lithium-rich manganese positive electrode base material, or the surface of the lithium-rich manganese positive electrode base material is modified. The lithium-rich manganese-based positive electrode material has excellent cycling stability and rate capability, and the capacity is not obviously reduced after 800 times of cycling.

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 relates to the field of electro-catalysis new materials, and provides a biomass-based carbon-supported iron phosphide nano-catalyst and a preparation method and application thereof.According to the technical scheme, waste pomelo peel biomass is fully utilized, the stability and conductivity of a metal phosphide catalyst are improved, phytic acid is used as a phosphorus source for green synthesis of metal phosphide, and the metal phosphide is recycled. The problems of high energy consumption and high pollution in a traditional ammonia synthesis process are solved through an electro-catalysis technology, the technical and use requirements in actual production are met, and a brand-new ammonia synthesis way is provided.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a sodium ion battery. The negative electrode active material comprises a core-shell structure metal phosphide, and the core-shell structure metal phosphide comprises: an inner core, which comprises a bimetal phosphide derived from a Prussian blue compound; the shell layer covers at least part of the surface of the inner core, and the shell layer comprises metal phosphide. According to the negative electrode active material provided by the invention, through the synergistic effect of the bimetal phosphide derived from the Prussian blue compound in the inner core and the metal phosphide of the shell layer, the cycle performance and the rate capability of the battery are improved.

The invention discloses a solid-state electrolyte material and a preparation method thereof, a solid-state battery and a device, the solid-state battery electrolyte material is composed of elements A, B, P and S, A represents a Li element, B represents a doping element, P represents a phosphorus element, and S represents a sulfur element; the chemical formula is AxByPSz, x + y is greater than or equal to 1, and z is between 1 and 3; the doping elements are selected from at least four or more of Ag, Au, Co, Cr, Cu, Fe, Hf, Mn, Mo, Nb, Ni, Pd, Rh, Ru, Sc, Ta, Ti, V, W, Y, Zn, Zr, Al, Sn, In, Bi, B, Ge and Si. The solid electrolyte material prepared by the invention has high conductivity and excellent thermal stability, and has huge application potential in the field of solid-state batteries.

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%.

A method for producing a core / shell type semiconductor particle comprises a shell forming process at which a raw material zinc carboxylate salt and a group VI element precursor are added to a core particle dispersion solution to cause a reaction between the raw material zinc carboxylate salt and the group VI element precursor in the presence of the core particle to form a shell that includes zinc and a group VI element on a surface of the core particle, in which a ratio of carboxylic acids having 8 to 10 carbon atoms in whole of carboxylic acids that form the raw material zinc carboxylate salt is 80.0% by mass or more, and an average branching degree of the whole of the carboxylic acids that form the raw material zinc carboxylate salt is in the range of 1.1 to 2.9. The present invention provides a method for producing a semiconductor nanoparticle that can simply produce a semiconductor nanoparticle having a core / shell type structure that has excellent optical properties in the case where two or more types of shell precursors are used to produce the semiconductor nanoparticle having a core / shell type structure.