65 results about "Niobium pentaoxide" patented technology

The invention belongs to the field of lithium ion battery materials, and provides a composite coating coated graphite composite negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing a niobium pentoxide coated graphite precursor material; and (2) coating the niobium pentoxide coated graphite precursor material with a titanium dioxide coating by adopting a sol-gel method, and calcining to obtain the niobium pentoxide coated graphite composite material. According to the prepared composite coating coated graphite negative electrode material, the niobium pentoxide coating can reduce the interface impedance, and the titanium dioxide coating can ensure the stability of the structure. Therefore, the negative electrode not only has excellent rate capability, but also keeps excellent cycling stability, and the preparation method is simple and convenient.

The invention discloses a sintering aid coated lead barium titanate-based thermal sensitive ceramic and a preparation method thereof, and relates to the technical field of material science, the raw materials of the core layer comprise barium carbonate, lead tetraoxide, calcium carbonate, strontium carbonate, zirconium oxide, tin oxide, titanium dioxide, manganese oxide and niobium pentoxide; the raw materials of the shell layer comprise silica sol, an aluminum compound, a calcium compound, a sodium compound, a potassium compound, a magnesium compound and boric acid; the preparation method comprises the following steps: mixing the raw materials of the core layer, calcining at 950-1050 DEG C, adding a deionized water solution of the raw materials of the shell layer, mixing, calcining at 1000-1100 DEG C, adding a polyvinyl alcohol water solution, granulating, forming, degumming and sintering to obtain the sintering aid coated lead barium titanate based thermal sensitive ceramic. According to the invention, the sintering aid is used for coating the lead barium titanate-based thermal sensitive ceramic, so that the densification of the ceramic is promoted while grains are refined, and the ceramic has high voltage resistance and excellent PTC (Positive Temperature Coefficient) effect.

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.

The invention relates to a preparation method and energy storage application of a niobium pentoxide / carbon composite negative electrode material, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: dissolving niobium oxalate ammonium salt in an organic solvent to form a homogeneous solution, adding a polymer and the like, and continuously heating and stirring to prepare a spinning precursor solution; niobium-containing organic fibers are prepared through an electrostatic spinning technology; and carrying out programmed heating treatment on the fiber in an inert atmosphere to finally obtain the niobium pentoxide / carbon composite structure negative electrode material. According to the preparation process, in-situ compounding of niobium pentoxide and a carbon conductive substrate is realized through design of a molecular-level precursor and combination of an electrostatic spinning-pyrolysis technology, and a three-dimensional continuous conductive network structure is formed. When the obtained composite material is used as a negative electrode of a lithium ion battery, high specific capacity, excellent rate capability and long cycle stability are shown. The method has the characteristics of simple and efficient process, controllable product purity, high raw material utilization rate and the like, does not need complex post-treatment equipment, meets the green chemical requirements, and has remarkable industrial application value.

The invention relates to the technical field of ceramic glaze production, in particular to interlayer chemical coupling long-acting noctilucent ceramic glaze as well as a preparation method and application thereof. The glaze is of a multi-layer composite structure and sequentially comprises a bottom-layer combined glaze layer, a core noctilucent functional glaze layer and a photochromic protective cover glaze layer from inside to outside. The core layer adopts a glaze system containing niobium pentoxide to realize chemical coupling with the bottom layer, and adopts a core-shell structure long afterglow luminescent material to realize white light adjustability; and the protective cover glaze layer adopts a WO3 / TiO2 / CeO2 composite system. The glaze is prepared through a two-step method of high-temperature primary firing and low-temperature secondary firing, and the obtained glaze is high in interlayer bonding strength, high in weather resistance, long in luminous life, capable of adapting to ambient light and suitable for safety sign products in extreme environments.

The invention relates to the technical field of battery positive electrode materials, and discloses a secondary zinc-manganese battery positive electrode material, a preparation method and a secondary zinc-manganese battery, the secondary zinc-manganese battery positive electrode material comprises manganese dioxide, graphite, calcium stearate, polypyrrole and a niobium pentoxide nanometer material, the polypyrrole is coated on the surface of the manganese dioxide in an in-situ polymerization mode, and the niobium pentoxide nano material is integrated in the polypyrrole coated manganese dioxide composite material in an in-situ growth mode. According to the secondary zinc-manganese battery positive electrode material provided by the invention, a stable conductive network and an ion channel are constructed by adopting a manganese dioxide / polypyrrole / niobium pentoxide composite material, so that the conductivity and the structural stability of the positive electrode material at a low temperature are remarkably improved.

The invention provides a method for preparing a high-purity niobium ingot by utilizing multistage refining and the high-purity niobium ingot, and the method comprises the following steps: (1) taking aluminum particles, niobium pentoxide, a heat generating agent and a slag former as raw materials, preparing an aluminum-niobium alloy ingot by adopting an exothermic method outside a furnace, and then carrying out surface treatment and crushing treatment to obtain aluminum-niobium alloy particles; (2) the aluminum-niobium alloy particles are subjected to horizontal electron beam smelting, and a smelted niobium plate is obtained; (3) stacking a plurality of smelting niobium plates, and then sequentially performing vacuum diffusion welding and vacuum arc smelting to obtain a primary niobium ingot; and (4) the primary niobium ingot is placed in a double-gun electron beam smelting furnace to be smelted, and the high-purity niobium ingot is obtained. The stable production of the high-RRR value high-purity niobium is realized by adopting a multi-stage refining process coupling system of an aluminothermy method, horizontal electron beam melting, diffusion welding, electric arc melting and double-gun electron beam melting, and the technical problems of high energy consumption, high cost, low production efficiency and the like in the traditional process are effectively solved.

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 invention discloses a low-melting-point 18K gold material and a manufacturing process and application thereof, belongs to the technical field of alloy materials, and aims to solve the technical problem that the mechanical strength of an alloy is reduced while the melting point is reduced in the prior art. The low-melting-point 18K gold material consists of the following components: 75.0 percent of Au, 8.0 percent to 12.0 percent of Ag, 4.5 percent to 6.5 percent of Cu, 2.0 percent to 3.0 percent of Ge, 1.5 percent to 3.0 percent of Pd, 2.0 percent to 4.0 percent of Zn, 0.1 percent to 0.5 percent of Si, 0.1 percent to 0.3 percent of C and inevitable impurities of which the total amount is not more than 0.2 percent. Niobium pentoxide is added in the smelting process, carbon monoxide can be oxidized into carbon dioxide in the smelting process in gold melt, emission of carbon monoxide is reduced, and the smelting process is more environmentally friendly.

The application discloses a ceramic filler composition suitable for a silicone rubber foam material and application thereof. The ceramic filler composition comprises nano magnesium-aluminum hydrotalcite, ceramic auxiliary filler and ceramic filler, and the mass ratio of the three is 1-5:13-35:3-12. The ceramic auxiliary filler comprises low-melting point glass powder, lithium carbonate and di-niobium pentoxide, and the mass ratio of the three is 6-20:2-7:3-8. The melting point of the low-melting point glass powder is 320-650 DEG C. The ceramic filler comprises one or more of titanium dioxide, mica powder, wollastonite, montmorillonite, diatomite and kaolin.

The invention relates to a nanocarbon intercalated niobium pentoxide negative electrode material as well as a preparation method and application thereof. The preparation method of the nanocarbon intercalated niobium pentoxide negative electrode material comprises the following steps: (1) dispersing layered H4Nb6O17 powder in deionized water, then adding an alkaline organic intercalator, and stirring for 3-7 days at the temperature of 50-70 DEG C to obtain organic monomer intercalated H4Nb6O17; and (2) dispersing the obtained organic monomer intercalated H4Nb6O17 in a solution containing a polymerization initiator, stirring for 3-7 days at the temperature of 20-30 DEG C, washing, centrifuging, drying and carrying out heat treatment to obtain the nanocarbon intercalated niobium pentoxide negative electrode material.

The invention provides a high-voltage ceramic capacitor and a manufacturing method thereof, and relates to the technical field of electronic materials, the high-voltage ceramic capacitor comprises a ceramic dielectric layer and an electrode layer, the ceramic dielectric layer is prepared from the following raw materials in percentage by weight: 85% of barium titanate (BaT iO3), 10% of barium zirconate (BaZrO3), 3% of yttrium oxide (Y2O3) and 2% of niobium pentoxide (Nb2O5), by optimizing the formula and the preparation process of the ceramic dielectric layer, the dielectric constant of the high-voltage ceramic capacitor is remarkably improved, the high-voltage ceramic capacitor has excellent voltage resistance, reliable operation of equipment under a high-voltage condition is ensured, the risk of faults caused by voltage fluctuation is reduced, and the service life of the high-voltage ceramic capacitor is prolonged. In addition, the multi-layer metallized electrode structure effectively improves the mechanical properties of the electrode and the ceramic dielectric layer, improves the tensile strength of the electrode and the pin part, and improves the overall reliability of the capacitor.

The invention belongs to the technical field of ceramics, and discloses a special ceramic based on modified aluminum ash and a preparation method thereof. The special ceramic comprises the following raw material components in parts by weight: 1-10 parts of modified aluminum ash; 30 to 60 parts of clay; 10 to 20 parts of fly ash; 1 to 10 parts of niobium pentoxide; 1 to 5 parts of albite; 5 to 15 parts of barite; 2-8 parts of a metal oxide; 1-5 parts of carbide; 3 to 10 parts of nitride; 1-5 parts of polyvinyl alcohol; wherein the modified raw materials of the modified aluminum ash comprise a silane coupling agent, acrylate and bisphenol A novolac epoxy resin containing double bonds. The invention provides a reliable scheme for efficient utilization of the secondary aluminum ash and green and high-performance development of special ceramics. The special ceramic has high hardness, high bending strength and corrosion resistance at the same time, the Vickers hardness is 92-95 GPa, the bending strength is 974-991 MPa, and the corrosion depth is 0.20-0.32 mm.

The application discloses an iron-based barium sodium niobate ceramic material with high energy storage performance and a preparation method thereof. 4‑2x Sm 2x Na2Fe x Nb 10‑x O 30 , wherein 1<=x<=1.25. Barium carbonate, samarium oxide, sodium carbonate, ferrous oxide and niobium pentoxide are used as raw materials, and a standard solid-phase method is adopted to sinter the iron-based barium sodium niobate ceramic material. In the product formula, iron is used to replace niobium in the barium sodium niobate, which is lead-free, environment-friendly, rich in iron reserves and low in price, and is beneficial to control the cost of raw materials. In addition, the iron replacement is beneficial to enhance the relaxor ferroelectric performance of the material, can obtain a more slender hysteresis loop, and improves the energy storage efficiency of the material. The prepared ceramic material has few pores and cracks, high density, and the microstructure is obviously improved, the grain size is more fine and uniform, the ferroelectric polarization intensity and the breakdown field strength are significantly improved, the problem that the barium sodium niobate material is difficult to sinter is solved, and the ferroelectric performance and the energy storage performance are significantly improved.

The invention belongs to the technical field of ceramic lining plate preparation, and particularly relates to a wear-resistant ceramic lining plate and a preparation method thereof. The wear-resistant ceramic lining plate is prepared from the following raw materials: aluminum oxide, a sintering aid, aluminum titanate, modified urea resin microspheres, hafnium boride, tungsten disilicide and a KH-550 silane coupling agent, and the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide. According to the wear-resistant ceramic lining plate, aluminum oxide serves as a main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide serves as a sintering aid, a compound of modified urea-formaldehyde resin microspheres, hafnium boride and tungsten disilicide serves as a reinforcing and toughening phase, aluminum titanate serves as a conditioning agent, and the raw materials have a synergistic effect; and it is ensured that the prepared ceramic lining plate has good wear resistance, hardness and toughness.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery modified graphite negative electrode material, a preparation method thereof and a lithium battery, and the preparation method comprises the following steps: slowly adding water into an alcohol dispersion liquid of niobium pentoxide, stirring, and preheating for a set time to obtain a niobium pentoxide mixed solution; mixing the porous graphite precursor with the niobium pentoxide mixed solution, heating and stirring to volatilize the solvent to obtain solid powder; and carrying out heat treatment on the solid powder in an inert atmosphere at the temperature of 700-900 DEG C for 2-3 hours, thereby obtaining the product. A three-dimensional interconnected porous network is constructed in graphite particles, and a coating layer is constructed on the surface of graphite, so that an internal and external synergistic effect is realized, the wettability of graphite to an electrolyte is remarkably improved, and meanwhile, the fast charging capacity of a battery is improved.

The invention discloses an antioxidant waste magnesium alloy-aqueous solution hydrogen production system and a preparation method thereof, and belongs to the technical field of recycling of hydrogen production materials and waste magnesium alloys. The preparation method comprises the following steps: step 1, putting niobium pentoxide and cerium dioxide into a ball milling tank, and respectively carrying out continuous long-time low-energy ball milling and short-time high-energy ball milling; step 2, calcining the mixed powder to prepare a CeNb2O7 material; step 3, after the waste magnesium alloy is mechanically crushed, performing high-energy ball milling on the crushed waste magnesium alloy and a CeNb2O7 material to prepare waste magnesium alloy-CeNb2O7 composite hydrogen production particles, and performing tabletting and forming on the waste magnesium alloy-CeNb2O7 composite hydrogen production particles; and 4, preparing an aqueous solution, namely dissolving ethylene diamine tetraacetic acid, sodium hexametaphosphate and sodium chloride in water to form the aqueous solution. The preparation process is simple, the cost is low, efficient utilization of the waste magnesium alloy is achieved, and the prepared composite hydrogen production material can be stably stored and transported, can quickly respond to hydrolysis hydrogen production and is suitable for industrial production.

The invention belongs to the technical field of high-entropy ceramic materials, and particularly relates to a high-toughness high-entropy zirconate material and a preparation method thereof. According to the method, trivalent rare earth element oxide and tetravalent zirconium oxide are used as raw materials, and heterovalent doping is carried out through niobium pentoxide. Preparing high-entropy ceramic powder by adopting a mechanical activation and segmented sintering reaction method; and then the high-entropy ceramic powder is pressed into a wafer, a ceramic blank is placed in a muffle furnace to be calcined, furnace cooling is carried out after calcination is finished, and the prepared high-entropy ceramic material is of a pyrochlore phase and has better fracture toughness.

The invention provides smelting niobium and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method of the smelted niobium comprises the following steps that a niobium source and an aluminum source are provided, the niobium source is niobium pentoxide powder, and the aluminum source is aluminum powder; the niobium source and the aluminum source are mixed, an aluminothermic reduction reaction is carried out, the niobium-aluminum alloy is obtained, and the content of Nb is 85-89 wt%; the niobium-aluminum alloy is sequentially subjected to first smelting and second smelting, smelted niobium is obtained, and the conditions of the first smelting comprise that the smelting pressure is smaller than or equal to 5.0 * 10 <-1 > Pa, the smelting power is 230-270 kW, and the smelting speed is 35-50 kg / h; the conditions of the second smelting are as follows: the smelting pressure is less than or equal to 5.0 * 10 <-1 > Pa, the smelting power is 230-270kW, and the smelting speed is 40-55kg / h. The smelted niobium prepared through the method is low in impurity content and high in smelted niobium yield.

The present invention belongs to the technical field of building ceramics, and discloses a kind of anti-cutting cracking ceramic tile and its preparation method. The anti-cutting cracking ceramic tile comprises a body layer, a base glaze layer and a surface glaze layer from bottom to top, wherein: the raw material components of the body layer include basic body, silicon carbide whiskers and white carbon black modified alumina fiber; the raw material components of the base glaze layer include basic base glaze and composite inorganic particles, and the composite inorganic particles include nano-silicon dioxide and niobium pentoxide; the raw material components of the surface glaze layer include basic surface glaze, zirconium oxide whiskers, rare earth metal oxides and reinforcing agents, and the reinforcing agents include at least one of titanium carbide, silicon carbide and carbon nanotubes. The present invention reduces cutting stress, makes the reinforcing particles evenly dispersed, reduces agglomeration, prevents local stress concentration, and reduces the generation of cracks by setting a multi-layer composite structure and adding specific reinforcing and toughening materials in each layer, thereby improving the anti-cutting cracking performance of the ceramic tile.

The application relates to a wide-temperature-range negative temperature coefficient thermosensitive ceramic material and a preparation method thereof. The thermosensitive ceramic material comprises, in percentage by weight, 58.17-71.47% of lanthanum trioxide, 20.53-23.01% of aluminum trioxide, 3.98-15.36% of cerium dioxide and 1.54-5.94% of niobium pentoxide, and the chemical composition is La 1‑ x Ce x Al 1‑y Nb y O3, wherein x=0.05-0.20 and y=0.025-0.10. The NTC thermistor has the advantages of an ultra-wide temperature range (25 DEG C-1500 DEG C), good consistency of resistance value and B value, a resistance drift rate of less than 0.375% after aging for 500 hours at high temperature, high stability, long service life and the like.

The invention provides a preparation method of a hole sealing coating for a plasma spraying thermal barrier coating, and relates to the technical field of high-temperature thermal insulation materials. The hole sealing coating comprises the following raw materials in parts by weight: 40-50 parts of ammonia water (with the concentration of 25%), 30-50 parts of enamel powder, 30-50 parts of functional powder, 20-30 parts of zirconium oxychloride, 20-30 parts of yttrium chloride, 5-10 parts of ytterbium nitrate, 5-10 parts of gadolinium nitrate, 5-10 parts of dysprosium nitrate, 5-10 parts of chromic nitrate, 5-10 parts of tantalum pentoxide, 5-10 parts of niobium pentoxide, 3-5 parts of titanium dioxide, 3-5 parts of silicon dioxide, 3-5 parts of a binder, 60-90 parts of absolute ethyl alcohol and 40-60 parts of a solvent. The nano ceramic powder is prepared by using a hydrothermal reaction method, then the enamel powder, the nano ceramic powder and the like are mixed, wet grinding, drying, tabletting and calcining are performed to prepare a ceramic block which is applied to film plating, and the hole sealing coating is high in density and bonding strength, and can slow down the transmittance of oxygen, improve the oxidation resistance, improve the radiation coefficient of the coating and prolong the service life.

The invention discloses a wear-resistant and cold and heat-resistant electric porcelain glaze and a preparation method thereof. The electric porcelain glaze is prepared by mixing raw materials such as potassium feldspar, hard kaolin, albite, calcined bauxite, calcined talc, limestone, bentonite, a coloring agent, a rodlike niobium pentoxide-spherical molybdenum trioxide compound, an antimony oxide carbon nitride composite material and the like. The electroceramic glaze is used for glazing the surface of an electroceramic product blank, so that the wear resistance and cold and heat resistance of an electroceramic product can be improved at the same time, and the application prospect is good.

The invention discloses a preparation method of potassium-sodium niobate leadless piezoelectric ceramic based on a high-temperature melting process. The preparation method comprises the following steps: weighing potassium carbonate, sodium carbonate, polyvinyl alcohol and niobium pentoxide to obtain a first material; putting the proportioned first material into an agate ball-milling tank to form slurry, and sealing the ball-milling tank; ball-milling the prepared slurry on a planetary ball mill; pre-sintering the ball-milled slurry to obtain a second material; the second material is dried and then ground, and sieved powder is taken for granulation; and putting the mixed powder into an alumina crucible, and then putting the alumina crucible into a high-temperature furnace for high-temperature melting to obtain the potassium-sodium niobate leadless piezoelectric ceramic. According to the invention, by accurately controlling the ratio of different component raw materials and preparation process parameters and systematically researching the interaction of the factors, the piezoelectric property of the material is optimized, the density of the lead-free piezoelectric ceramic is improved, the design and development of a new material are promoted, the production efficiency is improved, and the stability and reliability of the material in practical application are enhanced.

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.

The invention relates to the technical field of batteries, provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment, and at least facilitates prolonging of the cycle life of the secondary battery. The secondary battery comprises a positive plate, a negative plate and a diaphragm, the diaphragm is located between the positive plate and the negative plate, and the negative plate comprises a negative current collector; the surface of the negative electrode current collector is covered with the negative electrode material layer, the negative electrode material layer comprises graphite particles and niobium-containing particles attached to the surfaces of the graphite particles, the niobium-containing particles are of core-shell structures, inner cores of the core-shell structures are niobium pentoxide, and outer shells of the core-shell structures are niobium elementary substances; the niobium oxide layer covers the surface, away from the negative electrode current collector, of the negative electrode material layer, the niobium oxide layer comprises niobium oxide particles, and the average particle size of the niobium oxide particles is larger than that of niobium-containing particles.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a method for efficiently preparing a niobium material and the niobium material prepared through the method.The method comprises the steps that niobium pentoxide and carbon black are fully mixed and react for a first time length, a first mixed material is obtained, hydrogen is introduced into a graphite carbon tube furnace, and a second mixed material is obtained; carrying out primary carbonization and secondary carbonization on the first mixture in the furnace to obtain niobium carbide; the ball mill carries out ball milling on the niobium carbide until the niobium carbide is proper in particle size, flat in particle shape and uniform in particle size distribution, and the particle size range is-100-300 meshes; the niobium carbide and niobium pentoxide are fully mixed and react for a second time period to obtain a second mixture, the second mixture is granulated to obtain a second mixture with the particle size of 2-4 [mu] m / g, propylene alcohol is used as an adhesive, cold press molding treatment is performed to obtain a pre-sintered niobium strip, and the pre-sintered niobium strip is subjected to multi-stage low-temperature treatment to remove low-temperature impurities, so that the niobium carbide / niobium pentoxide composite material is obtained. And redundant carbon and oxygen are removed through high-temperature treatment, qualified niobium strips with the purity being 99.98% or above are obtained, the process steps are simplified, and the production efficiency is improved.

The present invention proposes a method for improving the fast charging performance of niobium pentoxide by aluminum doping, that is, combining simple solvent thermal and heat treatment processes, introducing a certain amount of O 2‑ Vacancies and low oxidation state Nb 4+ , a modified niobium pentoxide material with stable fast charging performance was prepared, which improved the ionic conductivity and electrical conductivity. Due to the substitution of aluminum ions for niobium ions, the lattice stability of niobium pentoxide was improved, the undesirable transition of niobium ions in the battery cycle was reduced, the capacity during fast charging was stabilized, and the fast charging cycle stability was improved. When the modified niobium pentoxide material is used as the negative electrode of a lithium-ion battery, the niobium pentoxide material has a stable fast charging performance at 20A g ‑1 At a high current density of , the reversible specific capacity of 82 mAh g-1 can still be maintained after 9900 cycles, demonstrating long-term stability during high-rate charge and discharge. The present invention provides a very promising method for developing fast-charging electrode materials with high capacity and high structural stability.

The application discloses a low-melting-point 18K gold material and a manufacturing process and application thereof, belongs to the technical field of alloy materials, and aims at solving the technical problem that the mechanical strength of an alloy is reduced while the melting point is reduced in the prior art; the low-melting-point 18K gold material is composed of the following components: Au 75.0%, Ag 8.0%-12.0%, Cu 4.5%-6.5%, Ge 2.0%-3.0%, Pd 1.5%-3.0%, Zn 2.0%-4.0%, Si 0.1%-0.5%, C 0.1%-0.3%, and inevitable impurities with a total amount of not more than 0.2%. In the smelting process, the application adds niobium pentoxide, which can oxidize carbon monoxide into carbon dioxide in the gold melt during the smelting process, reduces the emission of carbon monoxide, and makes the smelting process more environmentally friendly.

The invention relates to a negative temperature coefficient thermistor material with a double-perovskite structure and a preparation method of the negative temperature coefficient thermistor material. According to the thermistor material, barium carbonate, calcium carbonate or strontium carbonate, lanthanum trioxide, neodymium oxide or samarium oxide and niobium pentoxide serve as raw materials and are mixed, ball milling, drying, grinding, calcining, re-ball milling, drying, grinding, cold isostatic pressing forming and high-temperature sintering are conducted, and the double-perovskite structure material can be obtained. The negative temperature coefficient thermistor material with the double-perovskite structure has an obvious negative temperature coefficient characteristic in a temperature range of 400-1200 DEG C, is stable in electrical property and aging property, and is a thermistor material suitable for manufacturing a thermistor used in a high-temperature environment.