239results about "Niobium compounds" patented technology

The invention belongs to the technical field of positive electrode materials, and provides a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a manganese-based metal ion solution, a precipitator solution and a complexing agent solution to obtain a manganese-based composite material precursor suspension, and drying to obtain a precursor; mixing the precursor with a lithium source, and then sequentially mixing and reacting with a phosphate radical source, a borate radical source and a niobium source to obtain a phosphorus boron niobate coated precursor; and mixing the precursor with a lithium source, and sintering. The invention also discloses the lithium-rich manganese-based positive electrode material prepared by the method. The positive electrode of the lithium ion battery comprises the positive electrode material. The lithium-rich manganese-based positive electrode material disclosed by the invention has a gradient coating structure, and the structure enables the positive electrode material to be high in capacity, good in cycle performance and less in interface side reaction; according to the invention, an in-situ co-firing bonding process is adopted, and a liquid-phase impregnation-segmented sintering integrated process is adopted, so that chemical bonding of a coating layer and a matrix is realized, interface falling is avoided, and the structural stability is enhanced.

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

To provide a niobium titanium-based oxide that can achieve secondary batteries with high capacity and excellent rate characteristics.SOLUTION: According to one embodiment, a niobium titanium-based oxide is provided. The niobium titanium-based oxide satisfies formulae (1) to (3) in an L*a*b* color space as measured in accordance with Japanese Industrial Standards JIS Z8722: 2009: 95.0≤L*≤100 (1), -1.0≤a*≤1.0 (2) and -1.0≤b*≤6.0 (3).SELECTED DRAWING: Figure 1

A titanium-containing oxide powder which is mainly composed of a titanium-containing oxide represented by Li4Ti5O12 or Ti1-X / 2Nb2O7-X (wherein 0 ≤ X < 2), and which is characterized by containing particles of the titanium-containing oxide and a solvation ionic liquid that is composed of an Li salt and an organic solvent.

This disclosure provides systems and methods for purifying precursor compounds. One method includes one or more of the following steps: mixing a crude product solution with a first solvent, wherein the crude product solution comprises a precursor compound and at least one impurity; wherein the boiling point of the first solvent is higher than the boiling point of the crude product solution; feeding at least the mixture of the crude product solution and the first solvent into an evaporator; and collecting a distillate comprising the precursor compound from the evaporator, wherein the purity of the precursor compound in the distillate is greater than 95%, as determined by [further steps]. 1 Determined by H NMR. Other methods and systems are presented in this paper.

The invention discloses a method for preparing 6N and above high-purity Nb2O5 by using a niobium oxalate precursor, belongs to the technical field of niobium pentoxide preparation, and solves the problems of low purity and high impurity content of Nb2O5 prepared by the existing method. The method comprises the following steps: mixing niobium oxalate with high-purity water to obtain a mixed solution; performing cold crystallization purification; separating niobium oxalate crystals from the mother liquor, washing and drying; the method comprises the following steps: putting niobium oxalate crystals into a crucible, putting the crucible into a vacuum reaction distillation furnace, sealing a system, vacuumizing to below 1Pa, carrying out inert gas replacement, and then carrying out stage heating and heat preservation; cooling to 800-900 DEG C, introducing high-purity oxygen into the system, and carrying out oxidation stabilization treatment at a constant temperature; after treatment, continuously cooling to 200 DEG C or below, and then naturally cooling to room temperature to obtain a high-purity Nb2O5 product. The Nb2O5 product prepared by the method disclosed by the invention is high in purity and low in impurity content.

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 invention provides a preparation method of ultra-pure niobium pentoxide, which is stable in process and high in efficiency, and aims to reduce the silicon content to be less than 3ppm and obtain ultra-pure niobium pentoxide through the synergistic effect of directional dissolution silicon removal and precision filtration and washing impurity removal.

The invention belongs to the field of separation, and particularly relates to a method for extracting and separating niobium and titanium from niobium concentrate. The method comprises the following steps: (1) crushing a niobium concentrate raw material, and then adding a carbonaceous reducing agent and a binder to prepare a spherical material; (2) heating the spherical material in an inert atmosphere for carbonization treatment to obtain pretreated powder; (3) heating and roasting the pretreated powder, and then continuously introducing chlorine until the reaction is finished; and (4) performing fractional condensation on a volatile gas-phase product in the roasting process to obtain NbCl5 and TiCl4, thereby completing the separation. The method is efficient in reaction, short in process, low in cost and free of secondary pollution, product purity exceeds 99%, traditional technical problems are solved, and industrialization is easy.

The application belongs to the technical field of microwave absorption, and relates to a wave-absorbing material capable of being inkjet printed and a preparation method thereof. The wave-absorbing material capable of being inkjet printed comprises MXene nanosheets, two-dimensional inorganic nanosheets, water and ethanol, wherein the mass ratio of the two-dimensional inorganic nanosheets / MXene nanosheets is 1-40%, and the volume ratio of the water / ethanol is 0.2-0.8. The preparation method of the wave-absorbing material comprises the following steps: MXene nanosheets are prepared by placing MXene precursor powder in a mixed solution of concentrated hydrochloric acid and lithium fluoride powder for etching; two-dimensional inorganic nanosheets are prepared by mixing layered oxide ceramic powder with acid solution for ion exchange and then carrying out intercalation reaction; and MXene / two-dimensional inorganic composite nanosheet ink is obtained by uniformly dispersing the two kinds of nanosheets in a water / ethanol mixed solvent. The preparation method has low cost, is simple and convenient to operate, and is environmentally friendly, and can realize large-scale production. The prepared wave-absorbing material has good stability, can be integrated on the surface of various rigid and flexible electronic devices in the form of inkjet printing, and can effectively reduce electromagnetic wave pollution.

The present application provides a modified manganese iron lithium phosphate cathode material, and its manufacturing method and application. The modified manganese iron lithium phosphate cathode material includes a doped manganese iron lithium phosphate core and a coating layer formed on the surface of the doped manganese iron lithium phosphate core, where the doped manganese iron lithium phosphate core contains Nb, and the coating layer includes LiNbO3 and Nb2O5. The modified manganese iron lithium phosphate cathode material of the present application is doped with Nb and has a double coating of LiNbO3 and Nb2O5 on its surface. The coating layer of the modified manganese iron lithium phosphate cathode material has good uniformity, conformity, and conductivity, and the cooperation of LiNbO3 and Nb2O5 improves the multiplication performance and long cycle performance of the LMFP electrode material.

This invention discloses a method for preparing interface-reinforced niobium pentoxide / porous graphene and its energy storage application. The method involves adding porous graphene oxide during the solvothermal synthesis of a niobium pentoxide precursor to obtain a composite precursor of niobium pentoxide and porous graphene oxide. This precursor is then annealed under a protective atmosphere to obtain the interface-reinforced niobium pentoxide / porous graphene composite material. The composite material obtained by this invention exhibits excellent performance as an electrochemical energy storage material. Furthermore, the preparation method of this invention is simple to operate, requires no complex equipment, and is easily controlled, making it suitable for mass production.

The invention discloses a method for preparing a bulk phase-surface layer gradient doped niobium titanium oxygen negative electrode material by adopting a fused salt electrochemical method and application, and belongs to the field of negative electrode material preparation. The method comprises the following specific steps: preparing a niobium-titanium-oxygen sheet as a cathode; the method comprises the following steps: by taking a LiCl-KCl eutectic mixture as basic fused salt, sequentially adding a first group of dopants and a second group of dopants; in an inert atmosphere, electrolysis is firstly carried out at a relatively low voltage to reduce the first group of elements and diffuse to a bulk phase; electrolysis is carried out under high voltage, so that the second group of elements are reduced and enriched on the surface layer; and washing, drying and grinding the product to obtain the negative electrode material with component and functional gradients from a bulk phase to a surface layer. A continuous gradient structure with a bulk phase rich in high-conductivity elements and a surface layer rich in fast ion elements is constructed in a single particle. According to the structure, the intrinsic electron conductivity, the bulk phase ion diffusion rate and the interface ion migration kinetics of the material are synergistically improved, and the low-temperature fast charging performance, the rate capability and the cycling stability of the material serving as the negative electrode of the lithium ion battery are remarkably enhanced.

The application relates to a kind of composite positive electrode active material and its preparation method, positive electrode, full solid-state battery in lithium battery production technical field.The composite positive electrode active material is core-shell structure, the core material includes ternary positive electrode material or lithium-rich manganese-based positive electrode material, the shell layer includes LiNbO2F.The application can effectively improve the high-voltage stability of the composite positive electrode active material by forming the shell layer of fluoride LiNbO2F on the surface of ternary positive electrode material or lithium-rich manganese-based positive electrode material, and then the cycle performance of the full solid-state battery can be effectively improved.On the other hand, by coating LiNbO2F, the solid-solid contact of the positive electrode and the solid-state electrolyte membrane can be effectively improved, the interface contact of the positive electrode and the solid-state electrolyte membrane is improved, and the polarization of the battery is reduced, the internal resistance of the battery is effectively reduced.

This invention discloses a process for preparing chlorides by reducing chlorination with rare metal oxides, comprising the following steps: S1, in an inert atmosphere, a mixture containing rare metal oxide powder, a reducing agent, and a chloride salt is subjected to a reduction reaction at a predetermined temperature 1; S2, the temperature is lowered to a predetermined temperature 2, oxygen is introduced, and the concentration of oxygen in the mixed gas is adjusted to carry out a chlorination reaction, and the chlorinated product is condensed and collected. This invention eliminates the need for gaseous chlorinating agents such as chlorine or hydrogen chloride, avoiding the leakage risks of liquid chlorine and compressed hydrogen chloride during storage and transportation; the raw materials can be directly rare metal oxides, with a wide range of sources, good process adaptability, and significantly reduced production costs.

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 M1aM22-aM3bNb34-bO87-c-dQd.

A thermal resistance sensor comprising a substrate, a structure bonded to the substrate, and a niobium oxide layer bonded to the structure.

The invention belongs to the technical field of lithium ion battery materials and electrochemistry, and discloses high-entropy doped niobium pentoxide nanoparticles as well as a preparation method and application thereof. The chemical formula of the nano-particles is Nb < 1-x > FeaCoeNiiCrjAlkO2, x = a + e + i + j + k, and x is larger than or equal to 0.04 and smaller than or equal to 0.06, 0 lt; a < lt >; 1, 0lt; lt, lt; 1, 0lt; ilt; 1, 0lt; jlt; 1, 0lt; klt; 1; the material has an orthorhombic system and a space group P2 / m, doped metal occupies Nb sites in an atomic-scale dispersion manner, and a unit cell parameter c axis is expanded to 0.41 nm; and the size of the nano particles is 50 to 200 nm. According to the preparation method, a hydrothermal method is combined with high-temperature sintering, niobium pentachloride is used as a niobium source, specific metal salt is used as a doping source, terephthalic acid is used as a ligand, and the material is prepared through the steps of solution preparation, hydrothermal reaction, drying and sintering. The nano-particles are high in electron conductivity and fast in lithium ion diffusion, the capacity reaches 156 mAh. G <-1 > under the rate of 100 C, the capacity retention rate is 88% or above after 1000 times of circulation under the rate of 10 C, and the nano-particles can be used as an excellent lithium ion battery negative electrode material and are suitable for the field of high-power lithium ion batteries.

The invention discloses a preparation method of a surface niobium coated nano nickel-rich ternary positive electrode material for a lithium ion battery. The preparation method comprises the following steps: mixing a transition metal salt solution with a precipitator and a surfactant, and performing solvothermal reaction to generate a precursor; mixing the obtained precursor with a lithium source, and calcining to obtain a nano nickel-rich positive electrode substrate; and carrying out wet mixing on the substrate, a niobium source and a lithium source, and carrying out secondary calcination to finally form the nickel-rich ternary positive electrode material of which the surface is uniformly coated with a niobium-based nano layer. The material has a nanosheet shape, so that lithium ion transmission channels are effectively increased, and the solid-phase diffusivity is improved; the niobium coating layer on the surface enhances the structural stability and mechanical strength of the material and inhibits volume change and surface degradation in the cycle process, so that the cycle life and rapid charging performance of the battery are remarkably improved while high specific capacity is maintained.

The invention discloses lithium niobate with high anisotropy and a smooth side wall and a preparation method of the lithium niobate, and belongs to the technical field of semiconductor processes. The preparation method comprises the following steps: by adopting typical reaction etching, the advantage of higher selectivity during reaction ion beam etching is reserved; adding a sacrificial mask SOH to isolate the top and sidewalls of the lithium niobate layer having the initial tapered profile; by increasing the thickness of the top metal hard mask, the mask budget of the top metal hard mask in subsequent etching is improved; and finally, etching the side wall comprising the redeposition layer and the conical lithium niobate structure with the metal seeds by adopting an ion beam, and finally cooperatively realizing a vertical side wall shape and a smooth side wall surface through zero-angle etching treatment, so as to obtain the lithium niobate with high anisotropy and a smooth side wall. According to the method, the separation of the top area and the side wall area of the lithium niobate is realized, the side wall roughness problem after the heavy deposition layer is removed is repaired, and the lithium niobate with high anisotropy and smooth side wall is obtained.

The application belongs to the technical field of electrode materials, and particularly relates to a Nb2O5-based confined fiber electrode material in the field of lithium energy storage, wherein spinning sol is prepared by electrospinning of carbon tubes, a self-sacrificial template, a polymer carbon source and a niobium source through regulation of electrospinning parameters, and then a membrane material is obtained through pre-oxidation-carbonization. The electrode material uses capillary carbon tubes as an effective mechanical enhancement framework of a fiber cage, improves the overall mechanical strength of the fiber material under the cage structure, and limits T-Nb2O5-x rich in oxygen vacancy defects in the fiber cage, so that a membrane electrode material with both porosity and flexibility is prepared, and the membrane electrode material has excellent electronic conductivity.

Provided are an electrochemical element having excellent load characteristics, an electrode active material, an electrode material, and an electrode that can constitute the electrochemical element, and a movable body including the electrochemical element. An electrode active material for an electrochemical element according to the present invention is a monoclinic niobium complex oxide, and Db / Da is 1.5 or more, where Da is a crystallite size in the a-axis direction, and Db is a crystallite size in the b-axis direction. An electrode material for an electrochemical element according to the present invention contains the electrode active material for an electrochemical element according to the present invention. An electrode for an electrochemical element according to the present invention contains the electrode active material for an electrochemical element according to the present invention or the electrode material for an electrochemical element according to the present invention. In an electrochemical element according to the present invention, either one of a positive electrode and a negative electrode is the electrode for an electrochemical element according to the present invention. A movable body according to the present invention includes the electrochemical element according to the present invention.

The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

The invention relates to the field of solid-state batteries, in particular to a halide electrolyte, a preparation method thereof and a solid-state battery. The chemical formula of the halide electrolyte is (1-n) Li < 1.4 > Al < 1.4 > Zr < 0.1 > OCl < 4 >. N > LiNbOCl < 4 > (at) x AlF < 3 > (at) y ZnO, nlt; 0 < = x < = 0.3, and 0 < = y < = 0.3. Wherein Li < 1.4 > Al < 1.4 > Zr < 0.1 > OCl < 4 > has good viscoelasticity and plasticity, and can show excellent interface mechanical compatibility under relatively low external pressure; the LiNbOCl4 can be used for improving the ionic conductivity of the electrolyte; alF3 has oxidation-resistant potential and is used for improving the oxidation-resistant potential of the halide electrolyte; znO has excellent air stability and is used for increasing the air stability of the halide electrolyte.

A composition comprising nanosized niobium oxide particles having a D50 of about 100 nm to about 2 μm, wherein the niobium oxide particles have a calculated particle size diameter D in nm:D=6⁢0⁢0⁢0S⁢S⁢A×ρwhere SSA is BET surface area in m2 / g and p is density of 4.6 g / cm3, that is less than about 30% different than the observed particle size diameter measured by SEM. This composition has beneficial properties for catalytic and electronic uses. Processes for making these particles and uses of these particles are further included.

The present invention relates to a mixed oxide of titanium, niobium, and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08; M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs, and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2, and 0 ≤ z ≤ 0.3. Figure for abbreviation: [Fig. 8]

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.