434results 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.

To provide a tantalic acid compound dispersion having high dispersibility to a polar solvent, especially water, good solubility to water, and excellent storage stability and a manufacturing method thereof.SOLUTION: A tantalic acid compound dispersion of the present invention is a tantalic acid compound dispersion containing a 0.1 mass% or over and under 30 mass% of tantalum in Ta2O5 conversion and has a tantalic acid compound particle diameter (D50) in the tantalic acid compound dispersion by dynamic light scattering of 100 nm or under. Also, a manufacturing method of a tantalic acid compound dispersion of the present invention includes a reaction step to produce a tantalum compound aqueous solution by adding hydrogen peroxide to a tantalum fluoride aqueous solution and a reverse-neutralization step to produce a tantalum-containing precipitate by adding the tantalum compound aqueous solution to an alkaline aqueous solution.SELECTED DRAWING: None

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 solid electrolyte material of the present disclosure is a solid electrolyte material including Li, M, O, and X. Here, M is at least one selected from the group consisting of Nb and Ta, X is at least one selected from the group consisting of F, Cl, Br, and I, and the solid electrolyte material has a specific surface area of greater than 7.5 m2 / g. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer arranged between the positive electrode and the negative electrode. At least one of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.

The solid electrolyte material of the present disclosure comprises Li, M, O, X, and H. Here, M is at least one selected from the group consisting of Nb and Ta, X is at least one selected from the group consisting of F, Cl, Br, and I, and the molar ratio of H to M is greater than 0.08 and 1.50 or less. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.

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.

The invention relates to the field of new energy batteries, in particular to a sulfide electrolyte composite material, a preparation method thereof and an all-solid-state battery, the sulfide electrolyte composite material comprises a core particle and a coating layer coating the surface of the core particle; wherein the inner core particle comprises sulfide solid electrolyte; the material of the coating layer comprises an amorphous compound; the amorphous compound comprises LiMX5Yn-1 / n, and M is selected from a group VB element and / or a group VIB element; x is a halogen element; n is greater than or equal to 1 and less than or equal to 3, and Yn-is at least one of NO3-, BO3 < 3->, BH4 <->, OH <->, O2 <->, BF4 <->, PO4 < 3->, N3 <->, SO4 < 2->, SO3 < 2->, S2 <-> and F <->. The sulfide electrolyte composite material provided by the invention can reduce the adsorption of moisture on the surface of the sulfide electrolyte, reduce the side reaction of the electrolyte and an active material under high voltage, reduce the interface impedance, make the solid-solid interface contact more stable, and have excellent chemical 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 relates to the technical field of lithium ion batteries, in particular to a low-temperature positive electrode material, a preparation method thereof, a positive plate and a lithium ion battery. The low-temperature positive electrode material comprises a base material and a coating layer, the preparation raw materials of the low-temperature positive electrode material comprise a first precursor and a second precursor, and the mass ratio of the first precursor to the second precursor is n; n, the average size r of single crystal particles of the low-temperature positive electrode material, the pole piece compaction density PD of the positive electrode piece containing the low-temperature positive electrode material, and the particle size d99 and particle size dmin of the low-temperature positive electrode material meet the condition that (n * PD * d99) / (dmin * r) is greater than or equal to 30 and less than or equal to 100. The low-temperature positive electrode material is low in cost and good in low-temperature charge-discharge performance.

The present invention provides an ion-conducting solid containing an oxide characterized by the general formula Li 6+a-c-2d Y 1-a-b-c-d M1 a M2 b M3 c M4 d B3O9 is represented. (In the formula, M1 represents at least one metallic element selected from a group consisting of Mg, Mn, Zn, Ni, Ca, Sr, and Ba; M2 represents at least one metallic element selected from a group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, In, and Fe; M3 represents at least one metallic element selected from a group consisting of Hf, Sn, and Ti; M4 represents at least one metallic element selected from a group consisting of Nb and Ta; and a, b, c, and d represent real numbers, each within certain ranges, while satisfying 0.010 ≤ a + b + c + d < 1.000.)

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 provides a preparation method of potassium fluotantalate, which comprises the following steps: adding hydrofluoric acid, nitric acid and sylvite into a fluotantalic acid solution to obtain a mixed solution; transferring the mixed solution into a closed reaction kettle, and carrying out hydrothermal reaction to obtain a potassium fluotantalate solution; and cooling the closed reaction kettle to cool and crystallize the potassium fluotantalate solution, and carrying out solid-liquid separation, washing and drying to obtain the potassium fluotantalate product. According to the preparation method of the potassium fluotantalate, the potassium fluotantalate is prepared by utilizing a hydrothermal method, the nitric acid is added into the mixed solution, and the hydrothermal potassium fluotantalate solution is cooled and crystallized by cooling a closed reaction kettle, so that the crystallization microenvironment of the potassium fluotantalate crystal is regulated and controlled, the crystallinity of the potassium fluotantalate is better, and the crystal grains carry less impurity mother liquor; therefore, impurities can be cleaned more easily, potassium fluotantalate crystals with the purity reaching 99.999% are prepared, and the requirement for preparing high-purity metal tantalum powder is met.

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.

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.

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 preparation method of a composite material, the composite material, a photoelectric device and a display device. The preparation method of the composite material comprises the following steps: providing a precursor solution, wherein the precursor solution comprises Mxene, a metal cation source and a first solvent; carrying out hydrothermal treatment to obtain an inorganic semiconductor particle / Mxene composite material solution; the inorganic semiconductor particle / Mxene composite material solution is subjected to microwave treatment, the composite material is obtained, and the composite material comprises inorganic semiconductor particles and Mxene quantum dots. According to the preparation method of the composite material, the inorganic semiconductor particles and the Mxene quantum dots have relatively strong electric field stability, so that the photoelectric device comprising the inorganic semiconductor particles and the Mxene quantum dots has relatively good luminescence performance.

To provide a tantalic acid compound dispersion with excellent water dispersibility, solubility, and storage stability, and a method for producing the same.SOLUTION: A tantalic acid compound dispersion according to the present invention contains: tantalum; at least one element X selected from the group consisting of alkali metal elements and alkaline earth metal elements; and a phosphorus compound and / or a chlorine compound, wherein the tantalic acid compound dispersion has a particle diameter (D50) of at most 1000 nm as determined by the dynamic light scattering method. Alternatively, a tantalic acid compound dispersion according to the present invention contains: tantalum; 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, wherein the tantalic acid compound dispersion has a maximum value of at least 70%T for transmittance in the wavelength range of 400-760 nm.SELECTED DRAWING: None

To provide a metallic compound inclusion capable of forming a protective film on a carbon substrate, without using a CVD apparatus.SOLUTION: A metal compound inclusion of the present invention is a metal compound inclusion for forming a metal-carbon composite coating on a carbon substrate, wherein the metal compound inclusion contains a compound of at least one metal element selected from Ti, Nb, Mo, Hf, Ta, W, Zr, Si.SELECTED DRAWING: None

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 discloses a preparation method of a high-entropy metal oxide. The preparation method comprises the following steps: adding a plurality of metal salts into a solvent containing a template agent, uniformly mixing to form a uniform sol, and sequentially aging, drying and calcining the sol to obtain the high-entropy metal oxide, the metal salt is selected from at least five of cerium salt, zirconium salt, hafnium salt, tantalum salt, niobium salt, titanium salt, vanadium salt, molybdenum salt, tungsten salt, copper salt, zinc salt and aluminum salt; the template agent is selected from one of polyether P123, branched polyethyleneimine (BPEI), xanthan gum, epsilon-polylysine, pluronic F-127 and polyvinylpyrrolidone (PVP). The invention further discloses a preparation method of the polymer. The high-entropy metal oxide prepared by the method shows excellent marine biofouling resistance, and has obvious advantages in the field of preparation of marine biofouling prevention materials.

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.

A tantalic acid compound dispersion according to the present invention contains: tantalum; at least one element X selected from the group consisting of alkali metal elements and alkaline earth metal elements; and a phosphorus compound and / or a chlorine compound. The tantalic acid compound dispersion has a particle diameter (D50) of at most 1000 nm as obtained by a dynamic light scattering method. An other tantalic acid compound dispersion according to the present invention contains: tantalum; 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 tantalic acid compound dispersion has a maximum value of at least 70%T for transmittance in the wavelength range of 400-760 nm.