56 results about "Vanadium nitride" patented technology

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

This invention discloses a lithium manganese iron phosphate composite material modified by a transition metal nitride and amorphous carbon composite coating, its preparation method, and its application, belonging to the field of lithium-ion battery technology. This invention uses vanadium nitride / amorphous carbon to composite-coat lithium manganese iron phosphate material, making the composite cathode material structure more stable. The use of vanadium nitride reduces the amount of carbon coating, avoiding the thickening of the coating layer and the decrease in tap density of the active material caused by high carbon content, which would hinder the lithium iron phosphate process. + The issue of diffusion. Vanadium nitride not only has good electrical conductivity, but also good Li... + Conductive transport properties enable rapid realization of Li + The insertion and extraction of Li not only improves the conductivity of the material, but also further opens up and increases the Li content on the surface of the cathode material. + The diffusion channels reduce the capacity loss of the modified material.

The disclosed technology relates generally to semiconductor manufacturing, and more particularly to precursor delivery in cyclic deposition of vanadium nitride thin films. In one aspect, a method of depositing a vanadium nitride thin film comprises providing a thin film deposition system comprising a vanadium precursor delivery line comprising first and second valves disposed between a final valve and a vanadium precursor source comprising a canister including a liquid vanadium precursor and a volume of gas including vaporized vanadium precursor. The method additionally comprises conditioning the vanadium precursor source, without a substrate in a thin film deposition chamber, by controllably removing a portion of the volume of gas in the canister by sequentially opening the first and second valves. The method additionally comprises disposing the substrate in the thin film deposition chamber and alternatingly exposing the substrate to the vaporized vanadium precursor and a nitrogen precursor.

The application discloses a vanadium-doped manganese iron lithium phosphate positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium batteries. In the preparation of the positive electrode material, lithium carbonate and a carbon source are ball-milled and mixed, lithium source and the carbon source are pre-dispersed to avoid agglomeration and promote uniform coating of the carbon layer, manganese iron phosphate, vanadyl oxalate and ammonium dihydrogen phosphate are subsequently added and ball-milled and mixed, pre-calcination is performed to form a precursor, vanadium elements are doped at manganese iron positions, a carbon source and urea are added and high-temperature calcination is performed, ammonia gas generated by decomposition of the urea is reacted with vanadium elements, volatilization of the vanadium elements at high temperatures is effectively inhibited, a nitrogen-doped carbon coating layer and a vanadium nitride conductive phase are generated, and the conductivity and structural stability of the material are further enhanced. By introducing vanadium elements, the application overcomes the shortcomings of existing manganese iron lithium phosphate materials in terms of electrochemical performance, improves the cycle stability and rate performance of the material, and exhibits more excellent performance in the charging and discharging process.

This invention relates to the field of metallurgical technology, and more particularly to a method for preparing vanadium nitride using a mixed reducing gas. The method includes: grinding vanadium trioxide uniformly and pressing it into vanadium pentoxide tablets; placing the tablets in an electric furnace; first heating to 500-700°C under a nitrogen atmosphere; then introducing a mixed gas of methane, hydrogen, and nitrogen and holding for 20 minutes; then further heating to 800-850°C and holding for 20 minutes to obtain high-purity vanadium trioxide; subsequently heating to 1050-1150°C and holding for 1-5 hours to obtain crude vanadium nitride; stopping the introduction of the reducing gas and holding at 1050-1150°C for 0-4 hours under a nitrogen atmosphere; and then cooling to room temperature to obtain high-quality vanadium nitride. The technical solution mentioned in this invention features a low-temperature, short-time, and simple-to-operate vanadium nitride preparation process, enabling its large-scale application. Simultaneously, the resulting products are carbon monoxide and hydrogen, both of which can be recycled, thus helping to reduce carbon emissions.

The invention discloses a tungsten / vanadium nitride heterojunction electro-catalytic material and a preparation method thereof.The preparation method comprises the steps that vanadium chloride, tungsten chloride and oxalic acid are dissolved in ethyl alcohol, the molar ratio of vanadium chloride to tungsten chloride is (0.5-3): (1-3), and a mixed solution is obtained; adjusting the pH value of the mixed solution to 1-4, carrying out hydrothermal treatment to obtain a reaction solution, washing a product in the reaction solution, and drying to obtain powder; the tungsten / vanadium nitride heterojunction electro-catalysis material is obtained by calcining the powder and a carbon source in an argon atmosphere according to the proportion of (200-600) mg: (0.5-1.2) mol, and the tungsten / vanadium nitride heterojunction electro-catalysis material is simple and feasible, low in raw material cost, green and pollution-free, and high in electro-catalysis hydrogen evolution activity and stability in an alkaline environment.

The present application discloses a high-alloy heat-resistant steel and a continuous casting preparation method therefor. The method includes providing molten steel and performing LF refining, adding microchromium and vanadium nitride alloy to the molten steel undergoing LF refining and melting same to obtain molten steel after LF refining; performing RH vacuum treatment on the molten steel after LF refining to obtain molten steel after RH vacuum treatment; performing continuous casting on the molten steel after RH treatment to obtain a continuous casting billet; using a peritectic steel protective slag during continuous casting, which includes components with the following contents: CaO, 35 wt% to 41 wt%; SiO2, 24 wt% to 39 wt%; Al2O3, 1.5 wt% to 4.5 wt%; F, 5 wt% to 8 wt%; R2O, 5.5 wt% to 9.5 wt%; MgO, ≤ 3.5 wt%; TC, 1.5 wt% to 5.5 wt%; wherein, m(CaO) / m(SiO2) = 1.1 to 1.4; Thalf, 1110 °C to 1170 °C; stacking and slowly cooling the continuous casting billet to room temperature to obtain a cooled billet; heating, solutionizing and continuously rolling the cooled billet to obtain rolled steel; cooling the rolled steel; performing normalizing and tempering heat treatments on the cooled rolled steel, with the normalizing temperature being maintained at 1040 °C to 1060 °C; cooling to room temperature after exiting the cooling bed and then tempering and holding at 760 °C to 780 °C, and cooling to < 100 °C to obtain the high-alloy heat-resistant steel.

The invention discloses a low-temperature steel flux-cored wire and a preparation method and application thereof, and belongs to the field of flux-cored wires. The flux-cored wire comprises a stainless steel strip and flux-cored powder filled in the stainless steel strip, and the flux-cored powder comprises, by mass, 37%-41% of electrolytic nickel powder, 18%-22% of metal chromium powder, 2.2%-3.2% of chromium nitride, 2.0%-3.5% of molybdenum powder, 16%-21% of electrolytic manganese powder, 1.6%-1.8% of pre-alloyed silicon-titanium-iron powder, 0.45%-0.55% of rare earth silicon iron, 0.6%-0.8% of vanadium nitride, 0.4%-0.6% of yttrium-stabilized zirconia, 0.08%-0.12% of boron-nickel alloy, 1.5%-2.0% of ferroniobium powder and the balance iron powder. And the balance iron powder. Through the design of the low-carbon and high-alloy flux core powder, the strength of a welding material is matched with that of a low-temperature steel base material, and good toughness, high strength and excellent corrosion resistance of the material are kept in an extremely low-temperature environment.

The present invention relates to the technical field of ammonia synthesis catalysts, and in particular to a cobalt-based vanadium nitride ammonia synthesis catalyst, its preparation method, and application. The vanadium nitride is ball-milled and mixed with cobalt acetylacetonate in an organic solvent. After stirring for a period of time, the organic solvent is removed to obtain the cobalt acetylacetonate / vanadium nitride. The cobalt acetylacetonate / vanadium nitride is heated in a hydrogen atmosphere to obtain the cobalt-based vanadium nitride ammonia synthesis catalyst Co / VN. The catalyst Co / VN prepared by this method can effectively reduce the activation energy required for the ammonia synthesis process and lower the reaction energy barrier.

The utility model relates to the technical field of vanadium nitride, in particular to a vanadium nitride crushing and screening device which comprises a positioning frame, screening equipment and a feeding hopper, the screening equipment for screening vanadium nitrogen materials is installed on the inner side of the positioning frame, and a screening net of the screening equipment is arranged in an inclined mode. A vertically-arranged feeding hopper is installed at the top of the positioning frame, a crushing mechanism for crushing vanadium-nitrogen materials is installed in the feeding hopper, a guide block is arranged above the crushing mechanism, and an adjusting mechanism fixedly connected with the positioning frame is arranged below the crushing mechanism; the first motor is started to drive the connecting shaft to rotate, the connecting shaft drives the driving gear to rotate, so that the driven gear rotates, at the moment, the rotating shaft on one side of the driving gear and the driven gear drives the crushing rollers on the outer side of the rotating shaft to rotate oppositely, and vanadium-nitrogen materials can be effectively crushed at the moment; and the crushed materials directly fall into screening equipment below, so that the screening efficiency of the vanadium-nitrogen materials is greatly improved.

The present disclosure relates to methods of forming a vanadium nitride-containing layer. The methods include providing a substrate within a reaction chamber of a reactor and depositing a vanadium nitride-containing layer on a surface of the substrate, where the deposition process includes providing a vanadium precursor to the reaction chamber and providing a nitrogen precursor to the reaction chamber. The present disclosure also relates to structures and devices including a vanadium nitride-containing layer.

The invention relates to a preparation method of gold-doped magnesium vanadate nitride as well as a product and application thereof. The gold-doped magnesium vanadate nitride is prepared through a chemical solution method and nitridation in an argon / ammonia gas mixed atmosphere. Magnesium vanadate is modified through nitridation, so that the diffusivity of ions can be improved, active sites can be increased, an interface is optimized, the electrochemical performance of the material is improved, and the electrochemical performance of the material is further improved through gold doping. The preparation process is relatively simple and easy to operate.

The invention discloses a method for reducing production cost by using vanadium slag, which fully utilizes the vanadium slag to produce HRB400E so as to reduce consumption of vanadium-nitrogen alloy and argon, the vanadium slag is added into molten steel during refining treatment, vanadium in the vanadium slag is reduced into the molten steel, argon is replaced by nitrogen serving as a bottom blowing medium, the nitrogen is decomposed into free nitrogen in a high-temperature state, and the free nitrogen is decomposed into free nitrogen in a high-temperature state. And free nitrogen reacts with reduced vanadium to produce vanadium nitride, so that vanadium slag alloy is replaced, the synthesis cost is reduced, and the method is one of the inventions for low-cost production. According to the method, argon is replaced by cheap nitrogen, and the method is an invention for low-cost production. According to the method, after the vanadium slag is added, the reduction reaction is performed to produce SiO2, the SiO2 in the vanadium slag reacts with CaO in the slag to produce low-melting-point calcium silicate, the melting point of the slag is reduced, fluorite is replaced, and the method is the third invention of low-cost production. The comprehensive application components of the three aspects reduce the production cost.

A method for depositing vanadium-containing films, including vanadium nitride and vanadium oxynitride, that generally includes (i) contacting a substrate with vanadium oxytrichloride vapor in a deposition reactor, (ii) purging any unreacted vanadium oxytrichloride with inert gas, (iii) contacting the substrate with a nitrogen containing reactant in a deposition reactor and (iv) purging any unreacted nitrogen containing reactant with inert gas. Additional steps can be included, for example substrate (v) treatment with plasma to remove residual oxygen from oxynitride film.

The invention belongs to the field of electrode materials, and provides a nano carbon-based electrode material which comprises the following raw materials in parts by mass: 5-9 parts of graphene, 1-5 parts of vanadium nitride, 1.5-4 parts of a gas-phase carbon source, 0.5-2.5 parts of a modifier and 0.5-2 parts of a metal catalyst, the graphene is multilayer, the gas-phase carbon source is methane, the modifier is a silane coupling agent, and the metal catalyst is a combination of copper and nickel; the invention also provides a preparation method of the nano carbon-based electrode material. Vanadium nitride and graphene are combined, so that the prepared nano carbon-based electrode material has high specific capacity, and multilayer graphene has a large number of micropores and mesopores, which is beneficial to rapid transmission and adsorption of electrolyte ions and improves energy storage efficiency.

The invention relates to the technical field of metallurgy, and particularly discloses a material modifier for ultrahigh-chromium high-carbon cast iron, the ultrahigh-chromium high-carbon cast iron and a smelting method of the ultrahigh-chromium high-carbon cast iron. The material modifier for the ultrahigh-chromium high-carbon cast iron is alloy metal powder and comprises the following raw materials in parts by weight: 6-8 parts of ferroniobium powder, 0.2-0.4 part of chromium nitride, 0.2-0.4 part of tungsten nitride, 0.15-0.25 part of vanadium nitride, 0.3-0.5 part of molybdenum nitride, 0.5-1.5 parts of chromium carbide and 3-5 parts of silicon carbide. The impact toughness and Rockwell hardness of the ultrahigh-chromium and high-carbon cast iron using the material modifier for the ultrahigh-chromium and high-carbon cast iron are as high as 4.90 J / cm < 2 > and 68.5 HRC, the toughness and hardness of the ultrahigh-chromium and high-carbon cast iron are improved, the minimum wear rate is 0.30%, and the ultrahigh-chromium and high-carbon cast iron has high wear resistance.

This invention discloses a surface-modified current collector, an all-solid-state battery, its preparation method, and an electrical device. The surface-modified current collector includes a negative electrode current collector substrate, a lithium storage layer, and a lithiophilic layer arranged sequentially along the thickness direction. The lithium storage layer has a plurality of micropores oriented perpendicularly to and / or inclined to the surface of the negative electrode current collector substrate. The lithium storage layer includes a conductive micropore template with a micropore structure having a plurality of micropores with the same orientation as the micropores and a vanadium nitride layer disposed on the surface of the conductive micropore template and the inner wall of its micropore structure. This lithium storage layer constitutes a three-dimensional conductive framework, which can guide lithium ions to transport longitudinally or tend to transport longitudinally and deposit uniformly, suppress lithium dendrite growth, and alleviate volume expansion stress during cycling. The lithiophilic layer provides low nucleation overpotential sites, further promoting uniform lithium deposition. Through the synergy of the above layers, uniform lithium deposition can be effectively achieved, and volume expansion stress during cycling can be dispersed and absorbed, significantly improving the cycle performance and safety of the battery.

The application discloses a method for calculating the strength contribution of vanadium and nitrogen elements to screw steel, and comprises the following steps: S1, calculating the influence of the existing form of vanadium elements in screw steel on the yield strength of screw steel and the contribution to the tensile strength; S2, calculating the influence of the precipitation temperature of vanadium nitride particles on the yield strength increment of screw steel and the influence on the tensile strength of screw steel; S3, calculating the contribution of the precipitated vanadium nitride to the yield strength of screw steel by affecting the grain size and the contribution to the tensile strength of screw steel; and S4, calculating the comprehensive contribution of vanadium and nitrogen elements to the yield strength of screw steel and the comprehensive contribution to the tensile strength of screw steel. The method and system provided by the application restore and describe the principle of the influence of vanadium and nitrogen elements on the strength of screw steel, can effectively improve the accuracy of the judgment of the strength of screw steel, and can improve the success rate of the work of steel grade component design and screw steel performance adjustment.

This invention relates to the field of powder metallurgy high-nitrogen steel preparation technology, specifically a method for optimizing the corrosion resistance of high-nitrogen steel based on powder metallurgy technology. The method includes: pre-treating gas-atomized high-nitrogen steel pre-alloyed powder by inert gas purging, constant-temperature heating for degassing, and mechanical stirring; then physically mixing it with a nano-chromium nitride, vanadium nitride, and niobium nitride composition; during filling, activating a variable-frequency mechanical vibration table to achieve gradient densification filling with a higher density at the bottom of the mold than at the top; after multi-stage vacuum and inert gas circulation, using stepped heating and simultaneous application of axial pressure and isotropic inert gas static pressure to complete solid-state sintering and preliminary densification. This invention, through gradient filling and multi-field coupled sintering process design, improves powder distribution and sintering densification state, reduces microscopic defects in the matrix, optimizes nitrogen element distribution, and enhances the corrosion resistance of high-nitrogen steel. The process has strong adaptability and is suitable for the powder metallurgy preparation of high-nitrogen steel components.

The invention relates to the field of welding materials, in particular to a stainless steel flux-cored wire for a high-temperature welding environment and a preparation method of the stainless steel flux-cored wire, which are used for solving the problem that the corrosion resistance of a common welding material is obviously influenced in the high-temperature welding environment. The stainless steel flux-cored wire comprises powder and a welding skin, the powder is obtained by mixing cobalt-grafted carbon alloy composite powder, molybdenum powder, ferrochrome powder, manganese powder and the like, the high-temperature stability of the flux-cored wire is improved through the cobalt-grafted carbon composite carbon material, and the high-temperature stability is jointly improved through addition of ferroboron powder, vanadium nitride powder and niobium-zirconium alloy powder; the welding skin is prepared by mixing 18Ni300 maraging steel powder and 0Cr18Ni9 austenite steel powder, so that the heat resistance and the corrosion resistance of the welding wire are improved; when the welding wire is used for welding, the welding wire is decomposed at a high temperature, released gas forms a protective layer, meanwhile, molten powder is mixed with a welding skin to form a high-quality welding seam, and it is ensured that the stable and reliable welding effect can also be obtained in a high-temperature environment.

The disclosed technology relates generally to semiconductor manufacturing, and more particularly to precursor delivery in cyclic deposition of vanadium nitride thin films. In one aspect, a method of depositing a vanadium nitride thin film comprises providing a thin film deposition system comprising a vanadium precursor delivery line comprising first and second valves disposed between a final valve and a vanadium precursor source comprising a canister including a liquid vanadium precursor and a volume of gas including vaporized vanadium precursor. The method additionally comprises conditioning the vanadium precursor source, without a substrate in a thin film deposition chamber, by controllably removing a portion of the volume of gas in the canister by sequentially opening the first and second valves. The method additionally comprises disposing the substrate in the thin film deposition chamber and alternatingly exposing the substrate to the vaporized vanadium precursor and a nitrogen precursor.

The invention relates to the field of alkaline electrochemical generators, in particular to the field of accumulators. More specifically, the invention relates to a secondary electrochemical generator with a zinc electrode, characterized in that it comprises: a) an electrolyte, which is an aqueous alkaline solution with a molar concentration of 4 M to 15 M of hydroxide anions, and a concentration of soluble silicates, expressed as silicon dioxide (SiO2), of 0.15 to 80 g / l; b) a zinc electrode comprising a conductive ceramic, which at least partially comprises nitrides and / or hafnium carbides and / or carbides and / or magnesium silicides and / or carbides and / or niobium nitrides and / or carbides and / or carbides and / or titanium nitrides and / or vanadium nitrides and / or carbides and / or azides of any two metals selected from the group consisting of hafnium, magnesium, niobium, titanium and vanadium.

The invention provides a secondary battery, a preparation method thereof and an electric device. The secondary battery comprises a positive pole piece, a negative pole piece and a diaphragm, the diaphragm is located between the positive pole piece and the negative pole piece, the diaphragm comprises a first polymer layer and a material layer arranged on the first polymer layer, and the material layer comprises an inorganic material. The inorganic material comprises lithium titanium aluminum phosphate, lithium germanium aluminum phosphate, lithium titanium germanium aluminum phosphate, lithium titanium tantalum aluminum phosphate, lithium tetrathiophosphate, lithium germanium phosphorus sulfur sulfide, lithium phosphorus sulfur chlorine sulfide, ferric oxide, copper oxide, titanium dioxide, tin dioxide, manganese dioxide, zinc oxide, zirconium dioxide, chromium nitride, vanadium nitride, nickel nitride, iron nitride, graphene oxide, graphite oxide and graphite fluoride; the secondary battery is one or more of fluorinated graphene, fluorinated carbon nanotubes and fluorinated carbon fibers, and the secondary battery has excellent high-rate cycle performance and long service life.

The present invention provides a silicon-based anode material, its preparation method, and its application. The silicon-based anode material comprises a nano-silicon core and a vanadium nitride coating layer and a nitrogen-doped reduced graphene oxide coating layer sequentially stacked on the surface of the nano-silicon core. The silicon-based anode material of the present invention can enhance the conductivity and structural stability of the silicon-based anode during long-term cycling, thereby extending the battery life. Lithium-ion batteries made using the silicon-based anode material of the present invention exhibit both good long-term cycling performance and rate capability.

The invention relates to a four-layer metal oxide / metal / metal / metal oxide coating that provides multispectral camouflage. Said coating having camouflage characteristics provides thermal, multispectral and electromagnetic protection by offering reflection, absorption and transmission properties against infrared (IR), ultraviolet (UV) and electromagnetic waves. As the ceramic layer, it comprises titanium dioxide (TiO₂), titanium nitride (TiN), zinc oxide (ZnO), zinc nitride (Zn₃N₂), iron (III) oxide (Fe₂O₃), iron (II) oxide (FeO), iron nitride (Fe₂N), aluminium oxide (Al₂O₃), aluminium nitride (AlN), tin oxide (SnO₂), magnesium oxide (MgO), magnesium nitride (Mg₃N₂), calcium oxide (CaO), calcium nitride (Ca₃N₂), cobalt oxide (CoO), tungsten oxide (WO₃), vanadium oxide (V₂O₅), vanadium nitride (VN), manganese oxide (MnO₃), chromium oxide (Cr₂O₃), chromium nitride (CrN), nickel oxide (NiO), boron oxide (B₂O₃), boron nitride (BN) or barium oxide (BaO). As the metal layer, copper (Cu), aluminium (Al), nickel (Ni), cobalt (Co), silver (Ag), gold (Au), iron (Fe), tungsten (W), tin (Sn), zinc (Zn), magnesium (Mg), vanadium (V), chromium (Cr), lead (Pb) or platinum (Pt) is used to provide protection against thermal cameras and UV rays, while electromagnetic waves are blocked. The adhesive-free layered structure is resistant to wear and provides versatile protection for military clothing and mobile platforms by optimising reflection and transmission.

The invention discloses high-strength nodular cast iron and a processing technology thereof, belongs to the technical field of cast iron preparation, and aims to solve the technical problem that the strength and corrosion resistance of nodular cast iron in the prior art need to be further improved. Magnesium-cerium-sulfur oxide microcapsule particles, iron-molybdenum-boron alloy particles and titanium-vanadium nitride composite particles are introduced in the preparation process of the nodular cast iron, so that different material units respectively participate in tissue formation, matrix construction and operation response processes of the nodular cast iron; the prepared nodular cast iron shows stable yield characteristics and lower volume wear and mass loss levels in tests of mechanical properties, wear resistance and corrosion resistance, keeps a more balanced performance state under the conditions of bearing, friction, corrosion and the like, and is suitable for application scenes with higher requirements on comprehensive service performance.

This utility model relates to the field of biosensor technology and discloses a vanadium nitride-enhanced fiber optic SPR sensor. The vanadium nitride-enhanced fiber optic SPR sensor provided includes an optical fiber body with a sensing region formed on the optical fiber body. From the inside to the outside, a gold film layer, a vanadium nitride film layer, and a gold nanoparticle film layer are respectively attached to the surface of the sensing region. By introducing vanadium nanosheets, which have high conductivity, low loss, and high refractive index, a composite structure is formed with noble metal nanoparticles (Au NPs), constructing a "high refractive index medium enhancement-localized surface plasmon resonance synergy" system. This compensates for the energy loss of the metal film, enhances the interaction between the electromagnetic field and the target molecules, and further improves the sensitivity of the sensor.

The application discloses a vanadium-based positive electrode material and a preparation method and application thereof. The vanadium-based positive electrode material comprises a nitrogen-doped carbon matrix, quantum dot-sized vanadium nitride and vanadium trioxide loaded on the nitrogen-doped carbon matrix, a non-homogeneous interface is formed between the nitrogen-doped carbon matrix and the quantum dots, a heterojunction is formed between the quantum dot-sized vanadium nitride and the quantum dot-sized vanadium trioxide, and the nitrogen-doped carbon matrix is formed by calcining melamine. The preparation method comprises the following steps: adding ammonium metavanadate and melamine in a molar ratio of 1:2-4 into a dimethyl sulfoxide aqueous solution, stirring, obtaining a homogeneous solid solution, centrifuging, drying, sintering at 555 DEG C-1555 DEG C for 1h-5h in an inert atmosphere, and naturally cooling to obtain the vanadium-based positive electrode material. The vanadium-based positive electrode material has abundant heterojunctions, the preparation process is simple, the conditions are easy to control, the vanadium-based positive electrode material has long cycle stability, high specific capacity and excellent rate performance when used as a positive electrode of a zinc ion battery, and the zinc ion storage performance is outstanding.

The invention relates to a method for coating a substrate with tetragonal vanadium nitride by means of high-power pulsed magnetron sputtering. The invention also relates to a substrate coated with at least one layer of tetragonal vanadium nitride. The method according to the invention is particularly useful in the fields of electronic components, transducers of sensors, optics, machinery and micromachinery, decoration and protection of surfaces, motor vehicles, aviation or aerospace.

The present invention relates to a carbon composite material for use in a positive electrode of a lithium-sulfur battery, the carbon composite material including a porous carbon material; and vanadium nitride particles formed on a surface of the porous carbon material. A lithium-sulfur battery using the carbon composite material has improved stability by rapidly converting lithium polysulfide into lithium sulfide.