2974 results about "Composite oxide" patented technology

The present invention relates to a positive electrode active material, and to a positive electrode active material including a lithium transition metal composite oxide in a form of a single particle which contains nickel, cobalt, and manganese, wherein the lithium transition metal composite oxide contains 60 mol% or more of the nickel among total transition metals and has a D50 of 5 µm or more, and a positive electrode and a lithium secondary battery which include the same.

A positive electrode active material, a method of preparing the same, and a positive electrode and rechargeable lithium battery including the same, the positive electrode active material including core particles including a layered lithium nickel-manganese-based composite oxide; and a coating layer located on the surface of the core particle and containing aluminum and zinc.

The invention discloses a positive electrode material, the positive electrode material is a lithium-nickel-cobalt composite oxide, the positive electrode material comprises secondary particles, the secondary particles comprise a plurality of primary particles, the positive electrode material has a primary particle microcrystalline coefficient P, and the microcrystalline coefficient P is more than or equal to 20000 and less than or equal to 100000. According to the single crystal material provided by the invention, the number of microcrystals in the primary particles is increased, so that the ionic conductivity of the material is enhanced, and the problems of high impedance, low capacity and the like of large-particle single crystals are solved.

The invention discloses a multi-component composite oxide dispersion strengthening molybdenum alloy and a preparation method thereof, and relates to the technical field of refractory metal powder metallurgy preparation. The molybdenum alloy comprises a molybdenum matrix and a Y-X-O composite oxide nano precipitated phase dispersed and distributed in the molybdenum matrix. The molybdenum alloy comprises the following components in percentage by mass: 1%-2% of Y2O3, 0.3%-1.2% of an active element X, 96.5%-98.7% of molybdenum and inevitable impurities, wherein X is selected from one of Ti, Zr and Hf; the Y-X-O composite oxide nano precipitated phase and the molybdenum matrix form a coherent or semi-coherent interface, and the interface mismatch degree is less than or equal to 5%. The molybdenum alloy has excellent high-temperature strength and creep resistance, and can be applied to the high-temperature fields of nuclear industry, aerospace and the like.

A silicon-carbon composite of the present invention comprises a lithium silicon composite oxide and carbon, wherein the lithium silicon composite oxide includes silicon particles, silicon oxide, magnesium silicate, and a lithium silicon compound. By comprising two or more carbon layers including a first carbon layer and a second carbon layer, the silicon-carbon composite can improve the performance of a secondary battery, such as slurry stability and initial charge / discharge characteristics, when used as a negative electrode active material of the secondary battery. In addition, the first carbon layer and the second carbon layer of the silicon-carbon composite satisfy specific thickness ranges, and thus, the silicon-carbon composite can further improve the performance of a secondary battery, such as capacity, cycle characteristics, and initial charge / discharge characteristics, when used as a negative electrode active material of the secondary battery.

A positive electrode active material, a method of preparing the same, a positive electrode, and a rechargeable lithium battery including the positive electrode are provided. The positive electrode active material includes core particles and a coating layer on the surface of the core particles. The core particles include a layered lithium nickel-manganese-based composite oxide having a nickel content (e.g., amount) of greater than, or equal to, about 60 mol % based on 100 mol % of a total metal amount excluding lithium. The coating layer includes Al and P.

The invention discloses a preparation method of a low-temperature SCR (Selective Catalytic Reduction) catalyst with coke loaded with transition metal oxide. The preparation method comprises the following steps: preparing superfine coal powder; removing mineral substances from the superfine coal powder to obtain ash-removed coal powder; chemically activating the deashed coal powder into an activated coal base; coking the activated coal base to form a coal coke carrier; and preparing a single Fe oxide catalyst and an Fe-Mn composite oxide catalyst which take the coal coke as a carrier. The catalyst is prepared from the coal, so that the utilization value of the coal can be improved, the conversion of the coal from fuel to raw materials can be accelerated, and the pollution of the coal to the environment is reduced. Meanwhile, compared with a noble metal catalyst and coke, the catalyst with the coke carrier prepared by the method disclosed by the invention is lower in price and wide in source, so that the preparation cost of the catalyst can be reduced, and compared with other matrix materials, the coke carrier prepared by the method disclosed by the invention takes superfine pulverized coal coke as a matrix, so that the cost of the catalyst is reduced. The preparation cost is lower, and the pore structure is richer.

The invention discloses a method for synthesizing methylal through acetalation by using a strongly acidic composite metal oxide, and particularly relates to preparation of a strongly acidic composite metal oxide catalyst and a method for preparing methylal through condensation of methanol and formaldehyde by using the strongly acidic composite metal oxide catalyst. The preparation method comprises the following steps: preparing a ZrO2-SiO2 composite oxide precursor by adopting a coprecipitation method, dipping and loading active metal and an auxiliary agent on the composite oxide precursor, and applying the active metal and the auxiliary agent to a process of preparing methylal through acetalation. The method has the advantages of simple synthesis, no corrosion to equipment, mild reaction conditions, capability of improving the activity and stability of the catalyst, and the like.

The invention discloses a rare earth antibacterial ceramic and a preparation method thereof, and belongs to the technical field of ceramic materials, the rare earth antibacterial ceramic comprises a base material, a rare earth antibacterial agent and an auxiliary additive, the base material is coated with a zirconium silicate coating layer; the matrix material is one of aluminum oxide or zirconium oxide, the rare earth antibacterial agent is a ternary composite oxide composed of at least three lanthanide elements, the lanthanide elements comprise Ce, Y, La and Nd, and the invention provides a preparation method of the composite material. Through collaborative innovation of ternary rare earth composite modification, zirconium silicate interface coating and a gradient sintering process, the core problems of single antibacterial spectrum, high-temperature failure and insufficient durability of traditional antibacterial ceramic are solved, and the antibacterial property, stability, biological safety and mechanical property are remarkably improved; and the method has clear technical progress and industrial application value.

The invention relates to the technical field of batteries, in particular to an electrode film, a preparation method thereof and a battery. The electrode film comprises an active substance, a sulfide solid electrolyte, a conductive agent, a binder and a protective component, wherein at least part of the protection component is located on the surface of the active substance to form a surface protection layer, and / or at least part of the protection component is located on the surface of the sulfide solid electrolyte to form a surface protection layer; the protective component comprises a composite oxide containing alkali metal. A battery includes the provided electrode film. The problems that the sulfide solid electrolyte and the active substance are not matched in structure, poor in interface stability and serious in side reaction in the electrochemical cycle process can be solved, the cycle performance of the battery can be improved, and the comprehensive electrochemical performance of the battery can be improved.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention relates to the technical field of catalysts, in particular to a catalyst for fire coal and a preparation process thereof, and the catalyst comprises the following materials in parts by weight: 2-8% of rare earth nitrate, 5-18% of alkaline earth metal salt, 2-5% of alkali metal salt, 0.5-1% of copper-manganese composite oxide, 0.2-1.5% of transition metal salt, 0.1-0.3% of nonionic surfactant, 0.05-0.15% of organosilicon compound and the balance of water. The coal-fired catalyst is specially designed for a power plant, has excellent permeation and adsorption performance, solves the problem that the coal-fired catalyst is difficult to uniformly disperse in blocky coal, promotes full combustion of the coal in the power plant, improves the combustion rate and the burn-off rate, eliminates solid hazardous wastes from the preparation raw materials, ensures safety and environmental protection, and is suitable for industrial production. The power plant can be assisted to save coal resources, emission of harmful pollutants can be reduced from the source, and remarkable economic benefits and environmental benefits are brought to the power plant.

The invention provides a low-cost high-specific-surface-area cerium-aluminum composite oxide, a preparation method and application thereof, and relates to the technical field of catalysts, the preparation method comprises the following steps: step S1, adding 10-40% of cerium salt, 50-90% of aluminum salt and 0-10% of lanthanum source or zirconium source into deionized water, stirring and mixing, filtering, and washing to be neutral to obtain a cerium-containing solution; step S2, impregnating an alumina carrier in the cerium-containing solution prepared in the step S1, and standing to enable the cerium-containing solution to be impregnated on the alumina carrier, so as to obtain impregnated slurry; and S3, drying the dipping slurry, and then roasting in an inert atmosphere to obtain the cerium-aluminum composite oxide. The stable cerium-aluminum composite material is formed by doping one of lanthanum and zirconium with different masses into aluminum oxide or cerium oxide, the problem that the adsorption capacity of a traditional ammonia trapping method is limited is effectively solved, and the adsorption capacity of the material to ammonia is remarkably improved.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to a thermal auxiliary material for promoting alkane dehydrogenation reaction efficiency and a preparation method and application thereof. The auxiliary material is composed of a heating main body, a heat storage carrier, a stabilizing auxiliary agent and a carrier auxiliary agent. Wherein the component of the heating main body is CuO; the component of the heat storage carrier is CaO-Al2O3 composite oxide; the stabilizing auxiliary agent is one or more of Cr2O3, La2O3, CeO2 and ZrO2; and the carrier auxiliary agent is one or more of MgO, BaO, NiO and Fe2O3. The thermal auxiliary material with high mechanical strength, high heat transfer performance and high stability is synthesized through the steps of coprecipitation reaction, high-temperature hydrothermal reaction, high-temperature calcination, vacuum impregnation, ultrasonic oscillation and the like; when the material is applied to an alkane dehydrogenation olefin preparation device, alkane conversion rate and olefin selectivity can be improved, the service life of a catalyst can be prolonged, and energy consumption of the device can be reduced.

The present invention belongs to the technical field of preparation of light metal alloy materials, in particular to a method for producing a magnesium-lithium alloy by a gaseous co-condensation method. The method comprises the steps of: 1) mixing and briquetting a lithium salt, a refractory agent and a catalyst under pressure, and then thermally decomposing to form an unsaturated composite oxide; 2) respectively crushing and ball-milling, and then briquetting the unsaturated composite oxide, magnesium oxide, a reducing agent and a fluxing agent; 3) reducing briquettes in vacuum; 4) making a gas pass through a first condensing chamber of a temperature control device, and then purifying; 5) The purified metal gas is condensed into the condensing phase of the alloy through the second condensing chamber of a quenching device; 6) obtaining the magnesium-lithium alloy with a purity being 99.5% or above by virtue of smelting and flux-refining, and then purifying by distillation. The magnesium-lithium alloy obtained in the present application is not segregated, so that a stable β-phase solid solution or a compound having an increasing purity being 99.95% is formed.

The invention relates to the field of lithium battery negative electrode materials, in particular to a silicon-based compound negative electrode material and a preparation method thereof.The negative electrode material comprises a compound of a silicon-based material and niobium-based composite oxide and metal nanoparticles loaded on the compound, the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide, and the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide. The negative electrode material is relatively good in conductivity, the conductivity and the lithium intercalation potential of the silicon-based composite negative electrode material are improved, the silicon-based material is prevented from generating side reaction with a solid electrolyte of a solid-state battery under low potential, meanwhile, the volume expansion of the silicon-based material in the charging and discharging process is relieved, and the comprehensive performance of the silicon-based solid-state battery is effectively improved.

An embodiment of the present invention provides a steel material, for a pressure vessel, comprising, in weight %, 0.06-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.40% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0010% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), 0.01-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0050% of magnesium (Mg), 0.0005-0.0050% of calcium (Ca), 0.0020% or less of oxygen (O), and the remainder being Fe and other unavoidable impurities. A microstructure comprises in terms of area fraction 30% or less of pearlite and the remainder being ferrite. A non-metallic inclusion contains Mg—Al—Ca—O composite oxide.

An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising a copper vanadium composite oxide dissolving Li atoms and represented by the following general formula (1):(CuxMy)(VaPb)Ot. In the general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu and V, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.60≤a≤2.40, 0.00≤b≤0.40, 5.00≤t≤9.00, 1.60≤x+y≤2.40, and 1.60≤a+b≤2.40.

The present invention relates to a wall-flow filter for removing particles from the exhaust gas of an internal combustion engine, which comprises a coating F, which comprises a sintered material S, wherein material S comprises an oxide, oxide-hydroxide, carbonate, sulphate, silicate, phosphate, mixed oxide, composite oxide, molecular sieve or a mixture comprising two or more of these materials.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses a lithium-manganese-nickel composite oxide and a preparation method thereof, a positive pole piece, a battery and an electric device. The crystal form of the lithium-manganese-nickel composite oxide is a spinel type, the ratio of the peak intensity I111 of a (111) peak to the peak intensity I400 of a (400) peak in an X-ray diffraction pattern of the lithium-manganese-nickel composite oxide is 2.1 < = I111 / I400 < = 3.3, the diffraction angle 2theta of the (111) peak is 18-19.5 degrees, and the diffraction angle 2theta of the (400) peak is 43.5-45 degrees. The lithium-manganese-nickel composite oxide has high stability and can improve the comprehensive performance of the battery.

A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, the method includes preparing nickel-containing composite oxide particles having a ratio 1D90 / 1D10 of a 90% particle size 1D90 to a 10% particle size 1D10 in volume-based cumulative particle size distribution of 3 or less; obtaining a raw material mixture containing the composite oxide particles and a lithium compound and having a ratio of a total number of moles of lithium to a total number of moles of metal elements contained in the composite oxide in a range of 1 to 1.3; subjecting the raw material mixture to a heat treatment to obtain a heat-treated material; subjecting the heat-treated material to a dry-dispersion treatment to obtain a first dispersion; and bringing the first dispersion into contact with a liquid medium to obtain a second dispersion.

An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising copper vanadium composite oxide powder dissolving Al atoms and represented by the following general formula (1), CuxMyVzOt (1). In general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu, V, and Al, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.70≤z≤2.30, 6.00≤t≤9.00, 1.00≤x+y≤3.00, and a molar number of the Al atoms in terms of atoms>a molar number of M atoms in terms of atoms if an M element is contained.

The invention relates to the technical field of coating materials, and discloses a pure titanium micro-arc oxidation coating for a vacuum cup and a preparation method thereof.The preparation method comprises the following steps that surface pretreatment is conducted, specifically, a pure titanium vacuum cup inner container workpiece is sequentially subjected to degreasing, acid pickling and ultrasonic cleaning; preparing an electrolyte, namely adding 15-25 parts by weight of a silicon-containing compound, 5-12 parts by weight of metal salt, 3-8 parts by weight of an antibacterial agent and 1-5 parts by weight of a stabilizer into deionized water, and controlling the pH value to be 8.5-10.5; and performing micro-arc oxidation treatment. According to the invention, a silane compound in the micro-arc oxidation electrolyte contains a high-activity silanol group which is subjected to condensation reaction with titanium hydroxyl on the surface of a pure titanium substrate under the action of an electric field to form stable covalent bonding, so that the bonding strength of the coating and the substrate is enhanced; metal ions generated by metal salt electrolysis are co-deposited with titanium ions through plasma discharge, a composite oxide structure is constructed, and micro defects on the surface of a titanium substrate are sealed.

The invention relates to an oxide catalyst for high-activity and high-selectivity production of a target product pyromellitic dianhydride in the process of producing pyromellitic dianhydride through durene air selective oxidation. A multi-component efficient system is used for construction for preparation. The preparation method comprises the following steps: fully and uniformly mixing a certain amount of a main active component oxide and an auxiliary agent metal hydrochloric acid or an ionic liquid aqueous solution, carrying out a hydrothermal enhancement process to obtain catalyst active precursor slurry, adding a dilution auxiliary agent, and drying and roasting the slurry prepared in the previous step under certain conditions to obtain the efficient metal synergistic oxide catalyst. On the basis of coordinated benefit application of different components in a composite oxide material, the metal synergistic oxide is synthesized through hydrothermal heat assistance, the metal synergistic oxide has excellent catalytic performance in a reaction for producing pyromellitic dianhydride from durene, the yield of a target product is increased, and the metal synergistic oxide is suitable for industrial application.

Disclosed is a positive electrode active material for lithium ion secondary batteries, the positive electrode active material containing a lithium nickel composite oxide that has a hexagonal layered structure. The lithium nickel composite oxide contains Li, Ni, and element M at an amount-of-substance ratio Li:Ni:M = a:b:c (wherein 0.90 ≤ a < 1.00, 0.80 ≤ b < 1.00, 0.00 < c ≤ 0.20, b + c = 1, and the element M is at least one element that is selected from the group consisting of Mn, Co, Al, Ti, Zr, W, Fe, Si, Nb, Mg, Ca, B, Na, K, Mo, Cu, V, P, and Ba). The nickel occupancy rate in the lithium site is 2.5% to 10.0% inclusive as obtained from the powder neutron diffraction pattern, and the half-value width of the diffraction peak of the (003) plane in the powder X-ray diffraction pattern is not less than 0.054° but less than 0.074°.

The invention belongs to the technical field of ferrous metallurgy and high-strength wear-resistant materials, and discloses large-thickness high-toughness NM550 wear-resistant steel and a preparation method thereof. Nb, Ti and V are cooperated according to the mass ratio of 1: 1: 2 to form a multi-element nano carbide (Nb, Ti, V) C main strengthening phase with the average particle size of 5-50 nm; in the controlled rolling and austenitizing stages, Cr and Mo elements form fine carbides, a main strengthening phase is induced to be separated out preferentially, and cluster aggregation is prevented; al initial deoxidation and Ce and Ca composite denaturation treatment are adopted to form spherical Ce-Ca-Al-O composite oxide inclusions, and the average particle size is smaller than or equal to 2 microns. By adopting clean smelting, uniform-temperature heating, temperature-controlled rolling, three-stage flow-regulating water cooling and two-stage tempering treatment, uniform regulation and control and multi-scale strengthening of the structure are realized. The yield strength is greater than or equal to 1400 MPa, the tensile strength is greater than or equal to 1850 MPa, the ductility is greater than or equal to 15%, the ballistic work at-20 DEG C is greater than or equal to 40 J, and the surface hardness is greater than

Disclosed are a positive electrode active material, a positive electrode including the same, and a rechargeable lithium battery, the positive electrode active material includes a first positive electrode active material including a layered lithium nickel-manganese-based composite oxide and a second positive electrode active material including a lithium-manganese rich composite oxide in which a molar ratio of lithium to a total metal excluding lithium is about 1.1 to about 3 and a manganese content is greater than or equal to about 60 mol % based on 100 mol % of a total metal excluding lithium in the lithium-manganese rich composite oxide.

The invention relates to a positive electrode active material, a positive electrode, and a rechargeable lithium battery. The positive electrode active material comprises a first positive electrode active material, a second positive electrode active material and a third positive electrode active material; the first positive electrode active material includes a lithium nickel manganese-based composite oxide in which a nickel content is greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the first positive electrode active material, and is in the form of a plurality of secondary particles each including a plurality of aggregated primary particles, the second positive electrode active material is in the form of a plurality of individual particles including a lithium nickel manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the second positive electrode active material, and the third positive electrode active material is in the form of a plurality of particles including a lithium manganese-based oxide.

The invention relates to a desolventizing layer modified silicon-carbon negative electrode and a preparation method, the desolventizing layer modified silicon-carbon negative electrode comprises a silicon-carbon negative electrode, the silicon-carbon negative electrode comprises porous carbon mainly comprising mesopores and a silicon substrate attached in the pores of the porous carbon, and the desolventizing layer is covered on the surface of the silicon-carbon negative electrode. The desolventizing layer is an oxide of an amorphous active metal and a composite oxide of the amorphous active metal and lithium, the desolventizing layer at least covers the surface of the silicon substrate in the pores of the porous carbon, the desolventizing layer is made of amorphous titanium oxide, lithium titanate, niobium oxide, lithium niobate and titanium niobate, and after the electrolyte permeates into the pores of the porous carbon, the surface of the silicon substrate is coated with the desolventizing layer. And the lithium ions subjected to desolvation through the desolvation layer are alloyed with a silicon substrate. And the structural stability, the charge-discharge efficiency and the rate capability of the silicon-carbon negative electrode material are improved.