324results 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 positive electrode material includes: a positive electrode active material; a coating layer covering at least part of the surface of the positive electrode active material; and a second solid electrolyte. The coating layer includes a first solid electrolyte. The first solid electrolyte includes Li, M1 and F. M1 is at least one selected from the group consisting of Ti, Al and Zr. The second solid electrolyte includes 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 belongs to the technical field of solid electrolytes, and relates to a selenium-doped sulfide solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the sulfide solid electrolyte is Li < 6 + / -iP < 1-x > MxS < 5-y > SeyX, i is greater than or equal to 0 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and less than 1, M is one or more of Zr, Ta, Nb, Mo, Bi, In and Y, and X is one or more of Cl, Br and F. According to the invention, the selenium element with larger ionic radius and lower electronegativity is introduced to replace the sulfur element, and Zr, Ta, Nb, Mo, Bi, In or Y elements are introduced, so that the doped sulfide solid electrolyte system has excellent stability to air, organic solvents and lithium while ensuring high ionic conductivity, and the assembled all-solid-state battery shows excellent cycle stability.

A ternary paraelectric having a Cc structure and a method of manufacturing the same are provided. The ternary paraelectric having a Cc structure includes a material having a chemical formula of A2B4O11 that has a monoclinic system, is a space group No. 9, and has a dielectric constant of 150 to 250, wherein “A” is a Group 1 element, and “B” is a Group 5 element. “A” may include one of Na, K, Li and Rb. “B” may include one of Nb, V, and Ta. The A2B4O11 material may be Na2Nb4O11 in which bandgap energy thereof is greater than that of STO. The A2B4O11 material may have relative density that is greater than 90% or more.

The invention discloses an oxide solid electrolyte coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium manganese iron phosphate preparation. The lithium manganese iron phosphate battery comprises a lithium manganese iron phosphate core and an oxide solid electrolyte coating layer, the oxide solid electrolyte coating layer comprises Li < 7 > La < 3 > Zr < 2 > O < 12 > (LLZO), Li < 6.75 > La < 3 > Zr < 1.75 > Ta < 0.25 > O < 12 > (LLZTO, Li < 3 > x La < 2 / 3-x > TiO < 3 > (LLTO), Li < 3 > BO < 3 > (LBO) and Li < 1 + x > Al < x > Ti < 2-x > (PO4) < 3 > (LATP); the lithium manganese iron phosphate core is LiMnxFe1-xPO4, wherein x is more than or equal to 0.5 and less than or equal to 0.8; the existing main problem of lithium manganese iron phosphate is solved, the comprehensive performance is improved, and the commercial application is promoted.

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 embodiment of the invention provides a tantalum carbide coating and a preparation method thereof. The method comprises the following steps: by taking tantalum carbide as a raw material, generating a first tantalum carbide coating on the surface of a coating carrier through a physical vapor deposition method, a first tantalum source and a first carbon source are selected, and a second tantalum carbide coating is generated on the surface of the first tantalum carbide coating in a second preparation mode; and a second tantalum source and a second carbon source are selected, and a third tantalum carbide coating is generated on the surface of the second tantalum carbide coating through the chemical vapor deposition method. The tantalum carbide coating is prepared by adopting a tantalum carbide coating preparation method. The second tantalum carbide coating is loose and porous and has many defects, the compactness of the second tantalum carbide coating can be improved by preparing the first tantalum carbide coating to guide the second tantalum carbide coating and preparing the third tantalum carbide coating to block pores of the second tantalum carbide coating, and therefore the super-thick compact tantalum carbide coating with the total thickness larger than 200 micrometers is prepared; and the process requirements and the preparation difficulty are greatly reduced.

The invention provides a temperature-resistant radar infrared compatible stealth coating and a preparation method thereof. The problems that an existing radar infrared compatible stealth coating is insufficient in temperature resistance and poor in low-frequency wave absorbing performance are solved. The temperature-resistant radar and infrared compatible stealth coating sequentially comprises a bonding layer, a wave absorbing layer and an infrared stealth layer from bottom to top, the bonding layer is made of NiCrAlY or NiCoCrAlY, and the bonding layer is made of NiCoCrAlY; the material of the wave absorbing layer is 20 wt%-65 wt% of a ceramic matrix and 80 wt%-35 wt% of an absorbent; the chemical formula of the absorbent is Fe0. 7Al0. 3Ti (1-x) RxO3, in the formula, x is equal to 0.2-0.55, and R is Ni, Nb or Ta; the infrared stealth layer is a precious metal layer arranged in a periodic structure.

The invention discloses an amorphous electrolyte. The amorphous structural general formula of the electrolyte is Li M N < m > X < n >, wherein M is one or more of Mg, Ca, Fe, Sr, Al, Zr, Hf, Sc, In, Ta, Nb, Y and La; wherein N is one or more of Ca, Zn, Cu, Sn, Zr, Hf, In, Ta, Nb, W, Al, La, Ce and Sm; wherein X is one or more of F, Cl, Br, I, N, O and S; wherein 0.5 < = a < = 12, 0.7 < = b < = 8, 0.1 < = m < = 5, and n > 0. The preparation method comprises the following steps: firstly, uniformly mixing a Li source, an M source and an N source which are weighed, and then synthesizing to obtain the amorphous electrolyte through high-energy ball milling. The amorphous electrolyte is applied to an all-solid-state lithium battery. The amorphous electrolyte has high ionic conductivity, the preparation method is simple, the amorphous electrolyte can be matched with a plurality of commercial positive electrode materials, and an all-solid-state battery assembled by using the halide solid electrolyte material has excellent electrochemical performance and has a commercial prospect.

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.

A mixed ionic-electronic conductor ceramic, comprising Ag-modified LLZTO ceramic. Further provided is a preparation method for the mixed ionic-electronic conductor ceramic, comprising the following steps: adding LLZTO ceramic to a solution containing a soluble silver salt and a reducing reagent to obtain silver oxide, and then reacting the silver oxide under the action of the reducing reagent to prepare the Ag-modified LLZTO ceramic. Further provided is a composite solid-state electrolyte, comprising the mixed ionic-electronic conductor ceramic, a lithium salt and a polymer. Further provided are a battery electrode material, comprising the mixed ionic-electronic conductor ceramic; and a battery, comprising the mixed ionic-electronic conductor ceramic or the solid-state electrolyte. When being used for electrode materials, said modified ceramic can achieve the effects of transporting both electrons and ions, thereby improving the dynamics of electrodes and achieving a good prospect of application in the field of batteries.

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 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 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.

A negative electrode active material is provided. A composition is expressed by a formula AlNb11-xMxO29. 0.5<x<5 is satisfied. The M is a transition metal element with a valence of 4 or more.

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.

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.

The invention provides tantalum oxide with low Fisher particle size and a preparation method thereof, and the preparation method mainly comprises the following steps: by taking fluotantalic acid as a raw material, neutralizing and precipitating by ammonia gas with the pressure intensity of 0.3-0.5 MPa and the fluotantalic acid to generate tantalum hydroxide, regulating and washing the tantalum hydroxide by dilute ammonia water with the concentration of 0.4-0.5 mol / L to remove fluorine, blow-drying by compressed air with the pressure intensity of 0.5-0.6 MPa, and drying by microwaves to obtain the tantalum oxide with low Fisher particle size. Calcining in a rotary furnace, and grinding. The low-Fisher-particle-size tantalum oxide prepared by the method can meet the particle size requirement on the raw material tantalum oxide during tantalum carbide production, has low apparent density, can be uniformly mixed with carbon, and avoids cracking of crucible equipment in the reduction process.

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.

An all-solid-state battery having a positive electrode, a negative electrode having a negative electrode active material layer, and a solid electrolyte layer between the positive electrode and the negative electrode material layer. The negative electrode active material layer contains 60% by volume or more of an oxide having a LISICON-type crystal structure. The solid electrolyte layer contains a solid electrolyte having at least one of an oxide having a garnet-type crystal structure or an oxide having a LISICON-type crystal 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.