230results about "Tantalum compounds" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

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 invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention relates to the technical field of niobium-tantalum-iron ore purification, in particular to a method for preparing high-purity tantalum pentoxide and niobium pentoxide from niobium-tantalum-iron ore. The method comprises the following steps: firstly, adding ammonium fluoride and ammonium sulfate to help mineral decomposition and reduce the roasting temperature, then treating the niobium-tantalum iron ore by using a sulfuric acid-hydrofluoric acid mixed solution to fully dissolve niobium-tantalum oxides, then extracting and separating niobium and tantalum by using a specific solvent system, and finally adding ammonia water to precipitate and calcine to obtain the niobium-tantalum iron ore. The high-purity niobium pentoxide and tantalum pentoxide are prepared, the product yield is high, the impurity content is low, and the niobium pentoxide and tantalum pentoxide are suitable for being used as raw materials of capacitor-grade tantalum powder and niobium powder.

A positive electrode material 1000 in one embodiment of the present disclosure comprises a positive electrode active material 110, a coating layer 111 that includes a first solid electrolyte and covers at least part of the surface of the positive electrode active material 110, and a second solid electrolyte 100. The first solid electrolyte contains Li, M1, and F. M1 is at least one selected from the group consisting of Ti, Al, and Zr. The second solid electrolyte 100 contains Li, M2, O, and X. M2 is at least one selected from the group consisting of Ta and Nb. X is at least one selected from the group consisting of F, Cl, Br, and I.

The invention discloses a modified solid-state electrolyte and a preparation method and application thereof, and relates to the field of solid-state batteries, in 300 crystal face grain size distribution of the modified solid-state electrolyte, Kn90 = (Ln90-Ln10) / Ln50, and Kn90 is more than or equal to 0.5 and less than or equal to 1.7; wherein Ln10 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 10%, and Ln50 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 50%; ln90 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 90%. According to the invention, the modified solid electrolyte has excellent ionic conductivity, good air stability, interface stability to metal lithium and relatively high oxidation potential stability.

The invention belongs to the field of new material preparation and electrochemical energy storage, and particularly relates to a micron silicon composite material for an all-solid-state battery and a preparation method and application of the micron silicon composite material. The electronic conductor and the micron silicon are calcined to form a conductive framework, then the conductive framework is compounded with the ionic conductor, the electronic / ionic conductivity is synergistically improved, specifically, the electronic conductivity is improved by doping the electronic conductor, and an effective buffer layer is provided for volume expansion of the micron silicon material; the doped ion conductor effectively reduces the diffusion barrier of lithium ions, promotes the rapid transmission of the lithium ions, improves the interface contact between the silicon negative electrode and the electrolyte, reduces the interface resistance, enables the lithium ions to be uniformly embedded, and obtains a stable SEI layer. The fast ion-electron conductor doping method balances the electron conductivity and ion transmission, when the obtained composite material is used as a negative electrode, the discharge capacity of an all-solid-state battery under 10C multiplying power reaches 97.9 mAh / g, the 200-time cycle capacity retention rate is 82.5%, the composite material is obviously superior to a traditional silicon-based negative electrode, and the composite material has a wide application prospect.

This method for producing a metal carbide is a method for producing a powder-shaped metal carbide using a complex polymerization method, the method comprising: a complexing step for mixing a metal hydroxide and a basic compound to produce a first mixed solution, adding hydrogen peroxide to the first mixed solution to produce a second mixed solution, and reacting the first mixed solution with the second mixed solution; adding an organic acid to the second mixed solution to generate a metal carbide precursor; a carbonization step for generating a metal carbide by firing the metal carbide precursor; and a pulverization step in which the metal carbide is pulverized to form a metal carbonized powder. The metal carbide powder according to the present invention has a specific surface area of 1 m2 / g or more and a roundness of 0.78 or more as determined by a BET method. Furthermore, the metal carbide intermediate dispersion of the present invention comprises a metal compound, a basic compound, hydrogen peroxide, and an organic acid, and the particle diameter (D50) of particles in the metal carbide intermediate dispersion as determined by particle diameter distribution measurement using a dynamic light scattering method is 1,000 nm or less.

In accordance with the purpose(s) of the present disclosure, as embodied and broadly described herein, the disclosure, in one aspect, relates to oxyhalide electrolytes and synthesis of oxyhalide electrolytes. The electrolytes have the general formula AzNv-yMyOX5-y, exhibit superionic conductivity, and can be produced via a relatively fast synthesis route. The electrolytes can be a component of different types of batteries or sensors for ion detection.

A solid electrolyte contains Li, Mα, Mβ, Mγ, Cl, and O. Mα is at least one element selected from the group consisting of Zr and Hf, Mβ is at least one element selected from the group consisting of Ta and Nb, and Mγ is at least one element selected from the group consisting of Gd, Yb, Dy, Er, Ho, Eu, and Sc. This provides the solid electrolyte with high ionic conductivity and high stability.

The application belongs to the technical field of chemical synthetic materials, and relates to an alkali metal ion intercalated transition metal chalcogenide compound as well as a preparation method and application thereof. x M m X n wherein A is one or more of alkali metal elements, and 0 < x < 1; M is one or more of transition metal elements, and m is 1-2; X is one or more of chalcogen elements, and n is 1-3; and the alkali metal ion intercalated transition metal chalcogenide compound is obtained by mixing and reacting an intercalation host transition metal chalcogenide compound, an intercalation guest alkali metal element-containing compound and an auxiliary metal intercalation agent.

The solid electrolyte contains Li, M [alpha], M [beta], M [gamma], Cl, and O, where M [alpha] is at least one element selected from the group consisting of Zr and Hf, M [beta] is at least one element selected from the group consisting of Ta and Nb, and M [gamma] is at least one element selected from the group consisting of Gd, Yb, Dy, Er, Ho, Eu, and Sc. As a result, it is possible to provide a solid electrolyte having high ionic conductivity and high stability.

The lithium composite oxide single crystal has a chemical composition represented by Li7-3x-w-vGaxLa3Zr2-w-vTaWNbvO12 (0.02≤x<0.5, 0≤W≤1.0, 0≤V≤1.0, and 0.05≤W+V≤1.0), which belongs to a space group I-43d in a cubic system and has a garnet structure.

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

The present invention relates to the technical field of functional materials, and in particular to an amorphous metal oxide hollow multi-shell material and a preparation method therefor and an application thereof. The method includes the following steps: 1) performing a heating reaction on a carbon source aqueous solution, filtering, washing, and drying to obtain a carbon sphere template; 2) dispersing the carbon sphere template obtained in step 1) in a first metal salt solution, heating, adsorbing, and drying to obtain a first solid precursor; 3) dispersing the solid precursor obtained in step 2) in a second metal salt solution again, adsorbing, and drying to obtain a second solid precursor; and 4) calcinating the second solid precursor obtained in step 3) to obtain the amorphous metal oxide hollow multi-shell material. According to the present invention, a defect-controllable doping energy level is introduced into a metal oxide hollow sphere by means of a two-step enhanced adsorption method, so that efficient absorption of wave bands in a solar spectrum is achieved.

To provide a sintered body having a cubic garnet type structure lithium metal oxide sintered at a temperature of 900°C or lower capable of being integrally sintered with an electrode and excellent in ionic conductivity, a solid electrolyte using the sintered body, an all-solid-state lithium-ion battery, and a method for manufacturing the sintered body, the solid electrolyte, and the all-solid-state lithium-ion battery.SOLUTION: Disclosed is a sintered body which includes particles comprising a lithium metal oxide of a cubic garnet structure represented by Li7-aLa3 A2O12 where the parameter a satisfies 0≤a≤0.9, and the element A is at least one element selected from the group consisting of Zr, Ta, Hf, Sn, Nb, Ti, V, Bi, Mo, and W, and lithium hydroxide located at grain boundaries of the particles. A volume ratio of the lithium metal oxide to the total of the lithium metal oxide and lithium hydroxide is in the range of 50 vol% or more and 95 vol% or less.SELECTED DRAWING: Figure 1

Provided are: a method for producing a proton-containing oxide, the method comprising reacting a basic oxide with a carboxylic acid melt having at least pKa4 and introducing a proton into the basic oxide to obtain a proton-containing oxide; a dense body of a proton-containing basic composite oxide; a fuel cell; a hydrogen production cell; a hydrogen sensor; or an ammonia synthesis cell; and methods for producing the same.

To provide a halogen-based compound capable of exhibiting high ionic conductivity and enabling visual checking of the mixing state of an additive when a dark-colored additive is incorporated.SOLUTION: There is provided a compound that satisfies formula (1) and has a mass fraction of an amorphous phase of 10% or more, wherein in formula (1), α and β are each independently a value greater than 0, γ is a value of 0 or more and less than 6, D represents an alkali metal element, M includes an element serving as a metal cation other than alkali metal elements, X represents a halogen element, and A represents an atomic group serving as a polyatomic anion containing two or more elements. Formula (1): DαMβX6-γAγ.SELECTED DRAWING: None

The invention relates to the technical field of lithium ion batteries, and discloses a multi-element co-doped garnet solid electrolyte and a preparation method and application thereof.The solid electrolyte is a compound with the following chemical formula structure: (Li < 1 + alpha > A < 1m + t >) (La < 3 + 3-uD < 2 + u >) (Zr < 4 + x > Hf < 4 + y > Y < 3 + z > Ta < 5 + v > Mr + w) (O < 2-12-oEs-o), chemical valence balance is met, alpha is smaller than or equal to 6.8, y is smaller than or equal to 0.07, y is smaller than or equal to 0.07, and y is smaller than or equal to 0.07. V + w + x + y + z = 2, and the range among v, w, x and y does not exceed 50% of the maximum value. According to the multi-element co-doped garnet solid electrolyte provided by the invention, the ionic conductivity can be remarkably improved, the activation energy can be reduced, the air stability can be greatly improved, and the applicability is wide.

The present application relates to non-ferrous metal technical field, specifically to a kind of method for preparing large bulk density of tantalum pentoxide by chemical method, comprising the following steps: (1) adjust acid;(2) heating;(3) heating after fluorotantalate solution is passed into ammonia;(4) second stage ammonia precipitation;(5) static washing;(6) drying, obtain dry tantalum hydroxide;(7) push boat furnace roasting, obtain large bulk density of tantalum pentoxide.The present application uses static continuous washing, without through physical filter pressing, change physical performance parameter.The present application uses push boat furnace static continuous roasting, and the bulk density of tantalum pentoxide grows naturally.The powder of the present application is loose and uniform after roasting, without screening.The present application can efficiently produce the tantalum pentoxide with bulk density greater than 2g / cm 3 .

The invention relates to the technical field of zinc ion batteries, in particular to a preparation method of a zinc negative electrode material, the zinc negative electrode material, a zinc negative electrode and a zinc ion battery. The preparation method of the zinc negative electrode material comprises the following steps that a precursor solution is obtained, and the precursor solution comprises at least one precursor raw material of Ta2O5, LiTaO3 and LiNbO3; carrying out microwave heat treatment on the precursor solution, and cooling to obtain a first system; and carrying out post-treatment on the first system to obtain the zinc negative electrode material. According to the preparation method of the zinc negative electrode material, the zinc negative electrode material with high dielectric constant and uniform size is prepared by adopting microwave heat treatment, has a nano-particle structure and a relatively large specific surface area, can be uniformly dispersed on the surface of a zinc negative electrode, and effectively shields an electric field, so that the electric field distribution on the surface of the zinc negative electrode is more uniform; therefore, excessive deposition of zinc ions in a local area is reduced, and formation of zinc dendrites is inhibited.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of high-fluidity tantalum oxide. According to the method, ammonium carbonate is adopted as a precipitator, ammonium carbonate can react with various metal ions to generate insoluble precipitates, high selective precipitates are achieved, precipitation reaction can be accurately controlled, and side reactions and unnecessary impurity precipitates are reduced. By-products of the reaction of ammonium carbonate and fluotantalic acid are water and carbon dioxide, and new impurities are not introduced, so that the quality of the final product is favorably improved. The preparation method provided by the invention is easy to operate and control, the solution with the required concentration is prepared, and the precipitation rate and degree can be conveniently controlled in the reaction process; meanwhile, complex equipment and strict condition control are not needed, laboratory and industrial field operation is facilitated, and equipment investment and operation and maintenance cost are reduced; by-products can be effectively recycled, environmental pollution is reduced, and the requirement of sustainable development is met.

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.

A positive electrode active material for a lithium secondary battery comprises a core component with a lithium transition metal oxide and a coating layer on the core component's surface. The material meets the condition 0.5<A / B<0.8, where A is the normalized intensity of the L3 high peak in a Ni L3-edge spectrum of the positive electrode active material, and B is the normalized intensity of the L3 high peak in a Ni L3-edge spectrum of the core component. The invention includes a positive electrode for a lithium secondary battery, comprising the described active material and a sulfide-based solid electrolyte, and optionally a conductive material. Additionally, a lithium secondary battery comprises the positive electrode active material. The manufacturing method involves preparing the core component, mixing it with a coating precursor to form a starting material, and thermally treating the starting material to form the positive electrode active material, ensuring the condition 0.5<A / B<0.8 is met.

The present invention relates to aliovalently substituted argyrodite-type solid electrolyte solid electrolytes. These solid electrolytes display and increased ionic conductivity.

To provide a carbon dioxide reduction photocatalyst particle having superior catalytic performance and a method for producing the same.SOLUTION: A carbon dioxide reduction photocatalyst particle comprising a base particle and a metallic silver (Ag) particle carried on the surface of the base particle, wherein the base particle has a composition represented by the general formula: ZnxTa2Oy (where x and y satisfy 0<x<1.0 and 0<y<6.0).SELECTED DRAWING: Figure 4

A solid electrolyte contains Li, Mα, Mβ, Mγ, Cl, and O. Mα is at least one element selected from the group consisting of Zr and Hf, Mβ is at least one element selected from the group consisting of Ta and Nb, and Mγ is at least one element selected from the group consisting of Gd, Yb, Dy, Er, Ho, Eu, and Sc.

To provide a novel Ta chloride-based electrolyte useful for sodium-ion batteries. [Solution] formula: NaTaCl6·xNaCl [In the equation, x is between 1 and 15 (inclusive).] An electrolyte represented by [a specific symbol / method].

To provide a nano-sized tantalum oxide particle with high specific surface area and excellent crystallinity, and a manufacturing method thereof.SOLUTION: A crystalline tantalum oxide particle has an average particle diameter (Dm) of 10 to 100 nm and a crystallite diameter (CS) of 10 to 100 nm.SELECTED DRAWING: Figure 2

The application relates to a high-heat-resistance red light-emitting material and a preparation method and application thereof, and the chemical general formula of the material is CaLaTiTaO7: x Eu 3+ , and 0 < x <= 0.8; the material is synthesized by a high-temperature solid-phase method, CaCO3, La2O3, TiO2, Ta2O5 and Eu2O3 are weighed according to the stoichiometric ratio, are ground and are calcined, the sintered product is cooled and is finely ground to obtain the material; the CaLaTiTaO7 material is first selected as a matrix to synthesize a CaLaTiTaO7: x Eu 3+ series red fluorescent powder, under 393 nm near-ultraviolet light excitation, the material presents characteristic red light emission of Eu 3+ ions at 613 nm. The CLTT:0.6Eu 3+ / PDMS flexible composite thin film constructed by the material can maintain structural integrity and light emission stability in an acid-base environment, and an LED device prepared by using the material has good white light emission characteristics.