645results about "Tungsten compounds" patented technology

Performance is improved. There is provided a negative electrode material for a battery, in which the negative electrode material includes carbon, sodium tungstate, and silicon particles 33 including silicon, and in the silicon particle 33, a ratio of the amount of Si in Si2p derived from elemental silicon to the amount of Si in Si2p derived from SiO2 in a surface layer when measured by X-ray photoelectron spectroscopy is 3 or more on an atomic concentration basis.

Rechargeable lithium-ion cells and implantable medical devices including the same are provided herein with niobium-based negative electrodes and high voltage positive electrodes. Electrode active materials are provided herein, including pseudoternary compositions within a Ti-Nb-W-O pseudoternary system and / or including titanium, niobium, oxygen, and an elemental dopant. Rechargeable lithium-ion cells provide herein with niobium-based negative electrodes afford improved energy density, and, more particularly, provide improved energy density at operating voltages for use in implantable medical devices.

The invention relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The present invention relates to a niobium metal oxide, niobium metal oxide secondary particles and a method for preparing the same, and a working electrode and an electrochemical cell comprising the niobium metal oxide secondary particles. The niobium metal oxide has the formula (I): NbxMyOz, where M is a metal selected from the group consisting of Ti, Zr, V, Cr, W and Mo, x is 2 to 18, z is 2.5 x + 3y and x / y is 1 to 3, and the crystal structure of the niobium metal oxide is a tetragonal tungsten bronze structure having four or eight pentagonal channels per cell, and a portion of the pentagonal channels is filled with-Nb-O-Nb-O-chains, and the remainder of the pentagonal channel is optionally embedded with lithium.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / bismuth tungstate heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving sodium tungstate dihydrate, bismuth nitrate pentahydrate and hexadecyl trimethyl ammonium bromide in deionized water, and obtaining bismuth tungstate by using a hydrothermal method; 2) dissolving ferric chloride hexahydrate and manganese chloride tetrahydrate in water, then adding a sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; and 3) dissolving bismuth tungstate and manganese ferrite into a sodium hydroxide solution, stirring, and drying to obtain the manganese ferrite / bismuth tungstate heterojunction photocatalyst. The formation of the heterojunction can greatly improve the activity of the manganese ferrite / bismuth tungstate in photocatalytic reduction of carbon dioxide.

The invention relates to the technical field of new energy materials, in particular to a thermoelectric composite material and a preparation method and application thereof.The thermoelectric composite material comprises 2D TMDs, a P-type semiconductor polymer and a conductive polymer, the P-type semiconductor polymer and the conductive polymer are cross-linked to form a composite conductive polymer, and the 2D TMDs are dispersed in the composite conductive polymer. The composite conductive polymer has the effects of forming a thermoelectric loop, regulating and modifying the interface of the 2D TMDs and protecting the 2D TMDs dispersed in the composite conductive polymer, and the 2D TMDs and the P-type semiconductor polymer convert heat energy into electric energy under the Seebeck effect. The thermoelectric building material additive comprises a thermoelectric composite material combined on an inorganic silica gel carrier. The thermoelectric cement-based material comprises cement and a thermoelectric building material additive. The thermoelectric cement-based material has good thermoelectric performance, stability and durability, and is suitable for scenes with obvious temperature difference or urgent energy recovery requirements.

The invention belongs to the technical field of tungsten metallurgy, and particularly relates to a method for reducing the water content of tungstic acid, which comprises the following steps: S1, heating a container filled with a sodium tungstate solution in a water bath kettle, stirring the sodium tungstate solution, and adding ethanol; s2, adding hydrochloric acid into the sodium tungstate solution added with the ethanol, adjusting the pH value of the solution, monitoring in real time in the reaction process to ensure that the pH value of the solution is stable, stopping heating to naturally cool the solution to an aging temperature for constant-temperature aging, and then filtering and washing; and S3, drying to obtain tungstic acid. The water content of the tungstic acid obtained after filtering and washing is less than or equal to 30wt%.

The application relates to a preparation method and application of a ball milling-calcination process-prepared cesium vanadium tungstate mixed heat insulation coating, and belongs to the technical field of heat insulation coatings. The application aims to solve the problems of high preparation cost, strict requirement on equipment, long preparation time and difficult morphology control of vanadium dioxide and cesium tungsten bronze used in the existing cooling coating. The prepared cesium vanadium tungstate mixed heat insulation coating is coated on the surface of glass, mainly aiming at blocking the infrared light thermal radiation in sunlight, the new type of high-efficiency heat insulation film utilizes the light absorption and phase change reflection characteristics of nanometer cesium tungsten bronze and vanadium dioxide to realize heat insulation. The application adjusts the proportion of cesium, vanadium and tungstate to adjust the heat insulation performance, the heat insulation coating is prepared through different proportions of acrylic resin / organic silicon resin, solvent, cesium vanadium tungstate mixed heat insulation coating and the like, and the heat insulation film with excellent infrared blocking property, good stability and excellent light transmittance is obtained.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

The application belongs to the technical field of fluorescent material synthesis, and particularly relates to a blue fluorescent powder with self-activation effect and a preparation method thereof, the chemical formula of the blue fluorescent powder is Li2Mg2W2O9 or Li2Zn2W2O9; the preparation comprises the following steps: 1) according to the chemical proportion of the fluorescent powder, magnesium / zinc source, lithium source and tungsten source are weighed and uniformly ground; 2) the uniformly ground mixed powder is placed into an alumina crucible, sintering is carried out, and the product is fully reacted after heat preservation for a period of time; 3) the product is uniformly ground again after cooling, and the blue fluorescent powder with self-activation effect is obtained. The application utilizes the special lattice structure of the substrate, and obtains the blue fluorescent powder with self-activation effect under an air atmosphere; the generated product has high purity, simple synthesis conditions, low cost and is easy to be prepared on a large scale; the prepared fluorescent powder has a high internal quantum efficiency of 68.7%, high luminous intensity and unique blue light emission characteristics.

The invention discloses a high-voltage lithium nickel manganese oxide positive electrode material and a preparation method thereof, a battery positive electrode and a battery, and belongs to the technical field of lithium ion battery materials. Comprising an inner core composed of a lithium-containing compound, the inner core is coated with a shell composed of tungstate, and a transition layer is arranged between the inner core and the shell. The tungstate has good chemical and thermodynamic stability, can prevent erosion of HF in the electrolyte, inhibit dissolution of transition metal, reduce the shuttle effect, and can greatly improve the capacity retention rate of the battery. The preparation method is simple in process steps and convenient for large-scale preparation. Meanwhile, the cathode material coated with magnesium tungstate, calcium tungstate or bismuth tungstate has good dynamic performance, the capacity and the rate capability are remarkably improved, meanwhile, the stability of the material is also remarkably improved, and a good application way is provided for application of the high-voltage type lithium nickel manganese oxide cathode.

The invention discloses a treatment method of an ammonium paratungstate sieve head material. The treatment method comprises the following steps: S1, preparing a solution; step S2, dissolving; s3, filtering and washing; step S4, drying and screening; according to the process disclosed by the invention, the ammonium paratungstate sieve head material is adjusted and treated, the consumption of auxiliary materials is reduced, the energy consumption is low, and the open crystal appearance of the original ammonium paratungstate crystal is kept; compared with the original undersize ammonium paratungstate product, the ammonium paratungstate product recovered and treated by the method has the advantages that the impurity element content is lower, the total impurity content is 20-30ppm lower than that before treatment, and the product quality is integrally improved.

Disclosed in the present application are a lithium replenishing additive and a preparation method therefor, a positive electrode slurry and a battery. The lithium replenishing additive comprises: an inner core, the inner core satisfying the chemical formula LixM1yM21-yO6, wherein 6≤x≤8, 0<y<1, M1 is at least one of Zr, Nb, Sb, Bi, Ru, Ta, Sn, Hf, Ir, Pr, Pt and Np, and M2 is at least one of W, Ge, Ca, Ce, K and Ta; and a coating layer, the coating layer being at least provided on part of the surface of the inner core, the coating layer comprising a lithium-containing metal oxide and a carbon material, and the lithium-containing metal oxide satisfying the chemical formula LiaMbOc, wherein 1.8≤a≤2, 0.7≤b≤1.1, 2.8≤c≤3 and M comprises Ti and / or Zr. The lithium replenishing additive exhibits a diffraction peak intensity S1 relative to an X-ray within the 2θ diffraction angle of 20.1°-20.3° and exhibits a diffraction peak intensity S2 relative to the X-ray within the 2θ diffraction angle of 17°-17.3°, S1 / S2 being 0.02-0.05.

The invention discloses a separation and purification method of vanadium-containing tungstate. The method comprises the following steps: providing a vanadium-containing tungstate aqueous solution; providing an extraction liquid, wherein the extraction liquid comprises a sulfuric acid type quaternary ammonium salt extraction agent, a modifier and an organic solvent; mixing the vanadium-containing tungstate aqueous solution with the extraction liquid, and performing first extraction to obtain a first extraction phase and a first raffinate phase; providing strip liquor, wherein the strip liquor comprises alkali metal sulfate and alkali metal hydroxide; mixing the first extraction phase with the strip liquor, and carrying out first reverse extraction to obtain an alkali metal vanadate solution; and carrying out the same extraction and reverse extraction method on the first raffinate phase to obtain an alkali metal tungstate radical solution, thereby realizing respective separation and purification of vanadate radicals and tungstate radicals.

To provide an x-ray shielding material that offers better heat dissipation efficiency compared to conventional products and can eventually contribute to miniaturization of x-ray inspection devices and manufacturing cost reduction, and to provide an x-ray inspection device incorporating the same and a method of manufacturing the x-ray shielding material.SOLUTION: An x-ray shielding material 20 provided herein is used in x-ray inspection devices to shield x-rays, and consists of a sintered body 30 comprising a metal binder 21 made of a metal having a higher heat conductivity than lead and metal powder 22 of a metal that offers given x-ray shielding performance.SELECTED DRAWING: Figure 2

A metal acid compound dispersion containing at least two metals M selected from the group consisting of niobium, tantalum, molybdenum, tungsten, and titanium, said metal acid compound dispersion containing: at least one element X selected from the group consisting of alkali metal elements and / or alkaline earth metal elements; and a phosphorus compound and / or a chlorine compound. The particle diameter (D50) of the particles in the metal acid compound dispersion is at most 1000 nm as obtained by a dynamic light scattering method.

Methods of flash-within-flash (FWF) Joule heating and the systems thereof. The FWF Joule heating process subjects outer feedstock in an outer vessel to a flash Joule heating process, whereby the flash Joule heating process upon the outer feedstock results in the conversion of inner feedstock within an inner vessel (which inner vessel is within the outer vessel) to a converted material.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M1]x[M2](1−x)[Nb]y[O]z, wherein: M1 and M2 are different; M1 represents one or more of Ti, Mg, V, Cr, W, Zr, Mo, Cu, Fe, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Te, Se, Si, Sb, Y, La, Hf, Ta, Re, Zn, In, or Cd; M2 represents one or more of Mg, V, Cr, W, Zr, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; and wherein x satisfies 0<x<0.5; y satisfies 0.5≤y≤49 z satisfies 4≤z≤124.

The invention provides submicron high-purity tungsten powder and a preparation method thereof, and relates to the field of tungsten powder preparation. Ammonium paratungstate and ammonia water are mixed to obtain a mixture, the mixture is subjected to ammonia dissolving treatment, and a first ammonium tungstate solution is obtained through filtering; carrying out first ion exchange on the first ammonium tungstate solution by adopting strong acid cation exchange resin to obtain a first ion-exchanged solution; carrying out second ion exchange on the solution subjected to the first ion exchange by adopting chelating resin to obtain a high-purity ammonium tungstate solution; the high-purity ammonium tungstate solution is subjected to vacuum spraying and freeze drying, and a submicron tungsten precursor is obtained; and carrying out hydrogen reduction reaction on the submicron tungsten precursor to obtain the submicron high-purity tungsten powder. Insoluble particles and metal cation impurities in the solution can be effectively removed, and the high-purity tungsten precursor solution is obtained; raw materials are easy to obtain, and operation is simple.

The invention belongs to the technical field of tungsten hydrometallurgy, and particularly relates to a method for improving the crystallization rate of ammonium paratungstate, which comprises the following steps: S1, obtaining an ammonium tungstate solution which comprises metatungstate ions; s2, adding a supersaturation degree regulator into the ammonium tungstate solution, wherein the supersaturation degree regulator comprises hydrogen peroxide and ammonia water; s3, heating the ammonium tungstate solution to a first temperature, and then adding superfine ammonium paratungstate; s4, the ammonium tungstate solution is heated to a second temperature, heat preservation and continuous stirring are conducted, and ammonium paratungstate crystals are obtained; by adjusting parameters such as temperature, pH value, solvent type and concentration, optimizing crystallization conditions with metatungstate ions and ammonium paratungstate at the same time, improving the crystallization rate, and by controlling the degree of supersaturation of the solution, the situation that the crystallization rate is affected due to non-uniform crystal growth caused by too high crystallization rate is avoided, and the quality of the product is improved. The supersaturation degree can be controlled by adjusting parameters such as solution concentration and temperature.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for intensively decomposing wolframite by sulfuric acid, which comprises the following steps: S1, grinding wolframite, adding a decomposition aid, mixing with sulfuric acid, heating and roasting at low temperature; s2, mixing the roasted material with water, stirring and leaching, and filtering to obtain filter residues; and S3, washing the filter residues with water, and then carrying out ammonia dissolution to obtain an ammonium tungstate solution. According to the method, single sulfuric acid is used, decomposition is strengthened through low-temperature roasting, the decomposition efficiency is improved, and compared with conventional acid decomposition, the tungsten conversion rate is larger than 99%, and the tungsten leaching rate is larger than 98%; the added cerium-based decomposition auxiliary agent does not generate gas, is not flammable and explosive, completely enters a solution after being soaked in water, and has no influence on the quality of subsequent products; the leaching process is carried out at normal pressure without high pressure, and the operation process is safe and reliable.

The present invention discloses a solid-liquid separation device for producing sodium tungstate solution, which relates to the technical field of separation and includes a separation box, wherein the separation box is connected to a material pipe symmetrically distributed along the transverse direction of the separation box, the separation box is fixedly connected to two fixed frames on one side close to the material pipe, the separation box is fixedly connected to a motor symmetrically distributed along the longitudinal direction of the separation box, the separation box is rotatably connected to a screw symmetrically distributed along the longitudinal direction of the separation box, the screw is fixedly connected to the adjacent motor, a push plate is threadedly connected between the symmetrically distributed screws, the push plate is slidably connected to the separation box, and the fixed frame is horizontally slidably connected to a closing plate. The present invention, through the arrangement of components such as the motor, the screw, the push plate, and the closing plate, can discharge solid precipitates in the subsequent discharge process of the precipitate without pausing the flow in and out of the sodium tungstate solution.

The invention provides a solid electrolyte. The solid electrolyte is represented by a formula 1: Li < 7-m < x-(n-4) > A < x > La < 3 > Zr < 2-y > B < y > O < 12 >. In formula 1, A is one or more elements selected from the group consisting of Ga, Al and Zn, B is one or more elements selected from the group consisting of W, Ta, Nb and Sb, 0 lt; x is less than or equal to 1, 0lt; y is less than or equal to 1, and 7-mx-(n-4) y is more than or equal to 6, m is the valence state of A in the solid electrolyte and is 2 or 3, and n is the valence state of B in the solid electrolyte and is 5 or 6. By using co-doped LLZO, the use of noble metal is reduced, the cost is reduced, meanwhile, a cubic phase is substituted and stabilized at a Zr site, more Li vacancies can be introduced into LLZO, a low-melting-point phase is formed at a grain boundary, the sintering temperature is reduced, the densification of ceramic is promoted, and the ionic conductivity of a sintered ceramic wafer is improved.

The invention relates to a microcrystal / amorphous halide solid electrolyte which is doped and modified lithium zirconium halide, and the chemical formula of the microcrystal / amorphous halide solid electrolyte is Li < x > Zr < 1-y-z > Ta < y > M < 1z > X O < delta >, in the formula, M1 is any one of Nb, Hf, Mo and W, X is at least one of Cl, Br and I, 1.4 < = x < = 4, 0.3 < = y < = 0.7, 0.1 < = z < = 0.2, 4 < u < = 5, 0.7 < = delta < = 2. According to the invention, due to the synergistic effect of two high-valence positive ions and negative ion O < 2-> doping, lithium ions are easier to migrate in crystal lattices, the migration distance is reduced, and the original lithium zirconium-based halide with a trigonal structure is converted into an amorphous structure mixed with a small amount of microcrystals, so that the improvement of the ionic conductivity of the lithium zirconium-based halide is realized; the room-temperature ionic conductivity of the finally prepared microcrystal / amorphous halide solid electrolyte is 2.5 mS / cm or above.

A modified lithium iron phosphate, a preparation method therefor and a use thereof. The preparation method comprises the following steps: (1) mixing a zirconium salt, a tungstate and a solvent, to obtain a mixed salt solution, adjusting the pH, then adding lithium iron phosphate and performing a heating reaction; (2) separating a slurry obtained by the heating reaction into a solid and a liquid, and subjecting the obtained solid to a one-step sintering treatment, to obtain a first sintered material; (3) mixing an organic carbon source, a lithium source and the first sintered material, and performing a second sintering treatment, to obtain a modified lithium iron phosphate. A material having a negative thermal expansion effect is used as a coating layer, which is then coated with an electrically conductive material, causing pores to appear during a second coating process due to the negative thermal expansion effect, which is conducive to the embedding of organic matter and improves bonding tightness between the two layers of coatings. The pores generated during the negative thermal expansion process are conducive to the entry of lithium ions, which can better generate lithium tungstate and lithium zirconate from the tungsten oxide and zirconium oxide generated by decomposition.

The invention relates to a method for the manufacture of van der Waals heterostructures based on transition metal dichalcogenides selectively grown by chemical vapor deposition on a graphene substrate, characterized in that the surface of the graphene substrate is irradiated with an electron beam and the growth of the transition metal dichalcogenides in the areas irradiated with the electron beam is controlled by exposing the irradiated substrate to the atmosphere.The invention also relates to heterostructures manufactured by the described method, characterized in that a two-dimensional structure in the form of a monolayer is grown on the graphene substrate.

A preparation method for a tungsten sulfide (WS2) solid lubricating film based on high power impulse magnetron sputtering (HiPIMS) is provided. The preparation method includes the following steps: step 1: depositing a metal conductive film on a surface of a WS2 target; step 2: using magnetic field sputtering to remove the metal conductive film in a target sputtering area on the surface of the WS2 target, thereby obtaining a first WS2 target; and step 3: performing the HiPIMS on the first WS2 target to obtain the WS2 solid lubricating film. The preparation method can achieve stable glow discharge of a WS2 target and use the high deposition energy of HiPIMS to prepare the WS2 solid lubricating film with high compactness and excellent wear resistance.

The invention discloses a method for efficiently recycling residual alkali in tungsten ore decomposition liquid. The method comprises the following steps: step S1, evaporation and concentration; step S2, salting-out crystallization; s3, cooling, filtering and separating; the solution obtained after tungsten ore is decomposed and filtered in the step S1 is transferred into a multi-effect evaporator to be evaporated and concentrated, solid sodium hydroxide is supplemented to be dissolved to generate heat in the step S2 to be evaporated, meanwhile, sodium tungstate crystals are separated out through a salting-out crystallization method, the defect that the steam consumption of a direct evaporation crystallization method is large is overcome, and the yield of the product is improved. The direct recovery rate of sodium tungstate and sodium hydroxide is greatly improved, the production cost is saved, and the economic benefits of enterprises are increased; in the step S3, the sodium hydroxide mother liquor is returned to the tungsten ore decomposition procedure, sodium hydroxide is recycled through alkali concentration, salting-out and crystallization, the use amount of the auxiliary material solid sodium hydroxide is greatly reduced, the use amount of environment-friendly neutralization added acid is reduced, the salt content in production wastewater is reduced, and economic benefits are increased.

The application belongs to the technical field of medicine, and particularly relates to a La2(WO4)3 / CuWO4 composite sonosensitizer, a preparation method thereof and application thereof in sonodynamic therapy. The La2(WO4)3 / CuWO4 composite sonosensitizer contains 5-40% of La2(WO4)3 in terms of mass percentage. The application takes U251 glioma cells as a model target, and explores the application of the La2(WO4)3 / CuWO4 composite sonosensitizer in sonodynamic therapy of tumors. The results show that the La2(WO4)3 / CuWO4 composite sonosensitizer has a good sonodynamic therapy effect on U251 glioma cell lines after 1MHz US irradiation for 1min.

The invention discloses a transfer method for a heterogeneous double-layer structure of a suspended two-dimensional material, and belongs to the technical field of two-dimensional material transfer. The invention provides a method for transferring a two-dimensional material to a porous substrate by using PDMS and preparing a heterogeneous double-layer structure of a suspended two-dimensional material. The two-dimensional material is transferred to the hole substrate in sequence, the suspended two-dimensional material heterogeneous double-layer structure can be obtained, no solution needs to be used in the process, and pollution to the two-dimensional material is avoided. In the transfer process, the PDMS is adsorbed through electrostatic force between the slide and the PDMS, and the PDMS is lifted from one side to be separated from the substrate, so that the stress of the PDMS on the suspension part of the two-dimensional material in the transfer process can be remarkably reduced, and the transfer success rate is greatly improved. Compared with an existing transfer method, the transfer method does not need additional experimental instruments, and is simple to operate and high in success rate.