9 results about "Niobium pentaoxide" patented technology

The application relates to a high-capacity porous niobium pentoxide material and a preparation method and application thereof, relates to niobium pentoxide and preparation and application thereof, and aims to solve the technical problems of low conductivity and slow ion diffusion of existing orthogonal phase niobium pentoxide materials. The material is formed by interconnection of 100-300 nm niobium pentoxide matrix nanoparticles, growth of 10-30 nm secondary nanoparticles on the surface, and a 'raspberry-like' multi-level assembly morphology; the material has a pore diameter of 2-20 nm, a specific surface area of 15-45 m 2 / g; and has an orthogonal phase niobium pentoxide structure and carbon doping characteristics. The material is prepared by using a surfactant containing a quaternary ammonium cation as a soft template, utilizing electrostatic-coordination synergistic action to drive niobium salt and organic quaternary ammonium cation assembly, and high-temperature sintering in an inert atmosphere. When used as a negative electrode of a lithium ion battery, the material reaches a capacity of 350 mAh / g at a current density of 0.1 A / g, and can be used in the field of fast-charging type alkali metal ion batteries.

The application discloses a preparation method and application of a carbon fluoride / niobium pentoxide mixed positive electrode. The niobium pentoxide and a carbon precursor are mixed and ball milled according to a certain proportion, and then a gas phase fluorination is carried out on the mixture to prepare a carbon fluoride / niobium pentoxide composite material. The carbon fluoride / niobium pentoxide positive electrode is prepared by using a homogenate coating method, and the positive electrode is used in a lithium / carbon fluoride primary battery.

This invention belongs to the field of ceramic liner preparation technology, specifically relating to a wear-resistant ceramic liner and its preparation method. The wear-resistant ceramic liner is composed of the following raw materials: alumina, sintering aid, aluminum titanate, modified urea-formaldehyde resin microspheres, hafnium boride, tungsten disilicide, and KH-550 silane coupling agent. The sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide. The wear-resistant ceramic liner of this invention uses alumina as the main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide as the sintering aid, a composite of modified urea-formaldehyde resin microspheres, hafnium boride, and tungsten disilicide as the reinforcing and toughening phase, and aluminum titanate as a modifier. The synergistic effect of the raw materials ensures that the prepared ceramic liner has good wear resistance, hardness, and toughness.

This invention discloses a sulfur-loaded, nitrogen-sulfur co-doped niobium pentoxide-modified porous carbon composite electrode material and its preparation method, as well as a lithium-sulfur battery, belonging to the technical field of lithium-sulfur battery cathode material preparation. The method includes: activating a biomass carbon precursor with potassium hydroxide and carbonizing it at high temperature to obtain porous carbon; reacting a niobium source with the porous carbon in ethylene glycol via solvothermal reaction to obtain amorphous niobium pentoxide-modified porous carbon, followed by calcination to obtain orthorhombic niobium pentoxide-modified porous carbon; mixing with thiourea and heat-treating to obtain the nitrogen-sulfur co-doped niobium pentoxide-modified porous carbon composite electrode material; and then mixing with elemental sulfur and heat-treating to obtain a sulfur-loaded electrode material. This invention utilizes nitrogen-sulfur co-doping to regulate the electronic structure of niobium pentoxide, enhancing its chemical adsorption and catalytic conversion capabilities for lithium polysulfides. Combined with the high conductivity and structural buffering effect of porous carbon, it synergistically suppresses the shuttle effect, improving cycle stability and rate performance. This method is process-controllable, uses widely available raw materials, and is suitable for large-scale production.

This invention belongs to the technical field of electrical inorganic materials, specifically relating to a high-whiteness, high-voltage resistant insulator ceramic material and its preparation process. The ceramic material, by mass, consists of a basic component, a structure-regulating component, and an auxiliary phase component. Zirconia and niobium pentoxide are introduced to construct a composite regulation system, and various components such as talc, barium oxide, and magnesium oxide are combined to form a multiphase compatibility structure. The auxiliary phase uses rare earth oxides and borate fluxes to adjust the phase composition and stability. The preparation method includes steps such as raw material mixing, pressure filtration and mud refining, molding, drying and bisque firing, glazing, and high-temperature firing. A composite oxide glaze system is used for glaze construction. This invention features strong formulation synergy and precise structure regulation in its material composition and sintering process, making it suitable for the preparation of high-performance insulator ceramic products.

The application provides a method for preparing high-purity niobium ingot by using multi-stage refining and high-purity niobium ingot, and the method comprises the following steps: (1) taking aluminum particles, niobium pentoxide, a heating agent and a slagging agent as raw materials, preparing aluminum-niobium alloy ingot by using an off-furnace aluminothermic method, then performing surface treatment and crushing treatment to obtain aluminum-niobium alloy particles; (2) performing horizontal electron beam melting on the aluminum-niobium alloy particles to obtain molten niobium plates; (3) stacking a plurality of molten niobium plates, then sequentially performing vacuum diffusion welding and vacuum arc melting to obtain a primary niobium ingot; and (4) placing the primary niobium ingot in a double-gun electron beam melting furnace for melting treatment to obtain the high-purity niobium ingot. The multi-stage refining process coupling system of "aluminothermic method→horizontal electron beam melting→diffusion welding→arc melting→double-gun electron beam melting" is adopted to realize the stable production of high-purity niobium with high RRR value, and effectively solves the technical problems of high energy consumption, high cost and low production efficiency existing in the traditional process.

This invention relates to the field of humidity-sensitive materials technology, specifically to a ceramic-based high-sensitivity humidity-sensitive material and its preparation method, addressing the problems of low humidity sensitivity and slow response time in existing humidity-sensitive materials. Using niobium pentoxide and titanium as raw materials, core-shell powder is prepared via a two-step hydrothermal method, followed by electrochemical cathodic polarization to induce high oxygen vacancy concentration in the shell layer and optimize the heterojunction interface state. The material is prepared using a sol-gel method combined with high-temperature solid-state reaction, and processed via Li… + With Al 3+ Ti in the TiO2 lattice 4+ The dual acceptor cooperative substitution induces the generation of high-density oxygen vacancies and introduces Li + An ion-conducting channel is formed by spraying an aerosol deposition film and then annealing it under nitrogen protection to obtain a moisture-sensitive material. This moisture-sensitive material has a low response time, low hysteresis, and excellent long-term stability. Through the synergistic effect of the core-shell heterojunction barrier amplification effect and dual acceptor defect engineering, the sensitivity and response speed of the ceramic-based moisture-sensitive material are significantly improved.

The invention provides a process for macroscopically preparing a high-performance CO2 adsorbent NbOFFIVE-1-Ni and forming the high-performance CO2 adsorbent NbOFFIVE-1-Ni, which comprises the following steps: mixing niobium pentoxide, pyrazine, nickel nitrate hexahydrate, hydrofluoric acid and deionized water in a polytetrafluoroethylene container, and carrying out hydrothermal reaction at 120-140 DEG C to obtain blue powder NbOFFIVE-1-Ni; the preparation method comprises the following steps: mixing blue powder with an ethanol solution of polyvinyl butyral (PVB) in a certain mass ratio, segmenting the mixture by virtue of an extrusion molding method, and then drying, so as to obtain the molded strip-shaped particle NbOFFIVE-1-Ni-PVB. According to the method, kilogram-level preparation of NbOFFIVE-1-Ni is realized by regulating and controlling the concentration of the raw materials and reaction conditions, and the adsorption performance of the NbOFFIVE-1-Ni is not reduced; and then the NbOFFIVE-1-Ni is mixed with a high polymer material PVB, so that the compressive strength is improved by one order of magnitude on the premise that the adsorption capacity is not lost, and the problems that NbOFFIVE-1-Ni is low in compressive strength and difficult to prepare on a large scale are solved.

This invention relates to the field of microwave dielectric materials technology, and provides a niobium pentoxide-doped zinc borosilicate microcrystalline glass and its preparation method. This invention reduces the melting and volatilization of boron oxide and the formation of zinc borate by designing a low-boron zinc borosilicate microcrystalline glass formulation; and by introducing niobium pentoxide, utilizing Nb... 5+ The high electric field strength disrupts the original structural units in the glass structure, reconstructs the glass network structure, and thus modulates the dielectric properties of the glass-ceramic. Furthermore, the introduction of niobium pentoxide can regulate the glass crystallization characteristics, resulting in a glass-ceramic with a lower sintering temperature and better density. The results of the embodiments show that the dielectric constant of the niobium pentoxide-doped zinc borosilicate glass-ceramic obtained by sintering at 925℃ for 30 min is in the range of 4.4–6.1, and the dielectric loss is in the range of (0.48–5.36) × 10⁻⁶. ‑3 (between 1MHz)