1807 results about "Oxygen atmosphere" patented technology

Provided is a method of fabricating a ZnO thin film structure and a ZnO thin film transistor (TFT), and a ZnO thin film structure and a ZnO thin film transistor. The method of fabricating a ZnO thin film structure may include forming a ZnO thin film on a substrate in an oxygen atmosphere, forming oxygen diffusion layers of a metal having an affinity for oxygen on the ZnO thin film and heating the ZnO thin film and the oxygen diffusion layers to diffuse oxygen of the ZnO thin film into the oxygen diffusion layers.

Defects at the grain boundaries of a crystal silicon film, which has been crystallized from an amorphous silicon film, are passivated without using a hydrogen plasma treatment. An underlying film and a crystal silicon film which has been crystallized from an amorphous silicon film are formed on a glass substrate. A thermal oxide film is grown on the surface of the crystal silicon film by heating in an oxygen atmosphere into which NF3 gas has been added. As the thermal oxide film is grown, non-coupled Si is generated. The defects at the grain boundaries of the crystal silicon film are passivated by the additional Si. Then, the thermal oxide film is removed and the crystal silicon film is patterned into an island shape to form an active layer of a TFT. A gate insulating film, a gate electrode and the like are then formed sequentially to complete the TFT.

The invention discloses a preparation method for gradient coated LiNiO2 for lithium ion battery positive pole material, so as to solve the problem of bad circulating performance of conventional LiNiO2. The molecular formula of the LiNiO2 is LiNi 1-xMxO2, wherein, the x is less than or equal to 0.3 and greater than 0, the M is adulterated metal ions and is one or more selected from magnesium, nickel, Fe, titanium, zinc, Co, manganese, aluminum, Nb and vanadium, the gradient coat refers to that concentration gradient hydroxide coprecipitate provided with nickel and other metallic elements is coated on the surfaces of spherical nickelous hydroxide material, and then the precursor is mixed with lithium-source material and roasted under high temperature in an oxygen atmosphere furnace, so as to obtain high-performance modified LiNiO2. The gradient coated LiNiO2 obtained in the invention has the characteristics of high specific capacity, excellent circulating performance, excellent high-temperature property and the like, and is suitable for the application field of high- capacity lithium ion batteries.

The invention discloses a preparation method of high-yield biochar, which mainly comprises the following steps: (1) putting a collected biomass raw material into a catalyst solution, stirring and impregnating at normal temperature, and filtering to obtain the biomass raw material containing moisture and catalyst, the moisture weight percentage is 50-150%, and the catalyst weight content is 0.5-5%; and (2) heating the biomass raw material containing moisture and catalyst in an oxygen-free or limited-oxygen atmosphere to 100-180 DEG C at the rate of 0.5-2 DEG C/minute, keeping the temperature for 1-2 hours, heating to 240-300 DEG C at the rate of 0.5-3 DEG C/minute, keeping the temperature for 1-3 hours, heating to 500-900 DEG C at the rate of 10-50 DEG C/minute, keeping the temperature for 1-4 hours, and cooling to obtain the biochar, wherein the yield of the biochar is greater than 40 wt% of the biomass raw material. The method does not need drying in the biochar preparation process; the biomass raw material containing moisture and catalyst and the multi-step carbonization technique are utilized to achieve the goal of enhancing the biochar yield; and the biochar has the characteristics of energy saving, large specific area and high porosity, and can be widely used in the fields of water treatment, functional textiles and the like.

Disclosed is a polycrystal high-nickel positive electrode material used for a lithium ion battery. The polycrystal high-nickel positive electrode material comprises a base material with a layered structure and a coating layer which is arranged outside the base material and has a spinel structure; the general formula of the base material is LiNi<1-x-y>Co<x>M<y>O<2>, wherein M is at least one kind of Mn and Al; the coating layer is lithium manganese oxide; the mass percentage of the total impurity lithium on the surface of the base material is less than 0.085% based on the total mass percentage of the base material; the preparation method for the positive electrode material comprises the following steps of weighing Ni<1-x-y>Co<x>M<y>(OH)<2>, and mixing with a lithium source, then carrying out thermal treatment, cooling, crushing and sieving to obtain the base material; measuring the content of the residual impurity Li<2>CO<3> and LiOH on the surface of the base material, adding into the metal Mn compound according to the measurement result, and carrying out low-temperature thermal treatment in an oxygen atmosphere to obtain the polycrystal high-nickel positive electrode material used for the lithium ion battery. The polycrystal high-nickel positive electrode material provided by the invention has the advantages of low material alkalinity, low inflatable degree, excellent processing property and cycling performance, and the like.

The invention relates to a method for preparing high-purity vanadium from heteropolyacid impurities in an amine extraction mode. Generally an ordinary vanadium solution is doped with impurities such as chromium, silicon, phosphorus, tungsten, molybdenum and arsenic, if acid is added into the solution, heteropolyacids such as phosphorus tungsten, phosphorus vanadium tungsten, silicon tungsten, phosphorus molybdenum tungsten, silicon molybdenum tungsten, molybdenum vanadium arsenic and tungsten arsenic can be formed, the impurities in the solution are removed by carrying out compounding synergic extraction on the heteropolyacids in the ordinary vanadium solution by using amines and a synergist so as to obtain a purified vanadium-containing raffinate, subsequently the vanadium-containing raffinate is evaporated and concentrated to be the concentration that each liter of the solution contains 40g vanadium, ammonium salt is further added into the concentrated liquid to obtain ammonium metavanadate solid, vanadium pentoxide with the purity greater than 99.9% is obtained through washing in pure water, drying and calcining in an oxygen atmosphere, the organic phase after the heteropolyacid is extracted is subjected to reverse extraction by using an alkali solution so as to form a heteropolyacid water phase, and the organic phase is recycled and circulated. The method has low requirement on equipment, and is simple to operate, key extraction agents are good in thermal stability and not sensitive in acid and alkali, and a recycling and circulating method is simple and easy to be industrialized.

The present invention provides a method for preparing a catalyst for the reduction of nitrogen oxides by the use of natural gas as a reducing agent in an excess oxygen atmosphere, which comprises of filling zeolite with an organic compound having molecular weight of 100~250 prior to loading catalytically active noble metal components on a zeolite. Since the method according to the present invention supports catalytic active noble metal components on a zeolite under the condition that the pores of zeolite are filled with organic compounds, the noble metal component, which is essential for forming highly active NOx reduction catalyst, can be supported precisely on the desired positions of zeolite pores. Therefore, the NOx reduction catalysts prepared by the present invention are very useful for the purification of exhaust gas in an excessive oxygen atmosphere such as gas turbines, boilers or lean-burn automobiles.

The present invention provides a positive electrode active material for a non-aqueous electrolyte-based secondary battery, composed of a lithium/nickel composite oxide with high capacity, low cost and excellent heat stability, an industrially suitable production method therefor, and a high safety non-aqueous electrolyte-based secondary battery. A lithium/nickel composite oxide is produced by the following steps (a) to (c): (a) Nickel hydroxide or nickel oxyhydroxide having a specified component is prepared at a temperature of 600 to 1100° C., under air atmosphere. (b) Fired powders are prepared after mixing said nickel oxide and a lithium compound, and then by firing at a maximal temperature range of 650 to 850° C., under oxygen atmosphere. (c) Obtained fired powders are washed with water within a time satisfying the following equation (2) and then filtered and dried.

A<B/40   (2)

wherein, A represents washing time represented by unit of minute; and B represents slurry concentration represented by unit of g/L).

The invention discloses a method for preparing a ternary complex anode material (LiNixCoyMn1-x-yO2), which is characterized in that the lithium ion battery anode material (LiNixCoyMn1-x-yO2) is prepared by adopting a coprecipitation-silicon cladding-high temperature sintering-desilicication integrated method, and specifically comprises the following steps: mixing a nickel source and a cobalt source with a manganese source according to molar ratio of nickel-cobalt-manganese: x:y:(1-x-y), adding with water, stirring to form a solution, adding with a certain amount of ammonia water and a sodium hydroxide solution to generate a uniform NixCoyMn1-x-y(OH)2 ocyhydrate precursor, washing and filtering the precursor, adding with a certain amount of polyvinylpyrrolidone, stirring for a certain period, adding with a certain quantity of organosilicon reagents, stirring continuously to obtain an ocyhydrate precursor wrapped by organosilicon reagent-polyvinylpyrrolidone, washing, filtering, drying and then mixing the ocyhydrate precursor with a lithium source, calcining the mixture under air or an oxygen atmosphere under the temperature of 450-950 DEG C for 2-48 hours, and removing a silicon wrapping layer on a product by the utilizing a sodium hydroxide solution, thus obtaining the nanoscale or standard nanoscale lithium ion battery ternary complex anode material (LiNixCoyMn1-x-yO2). The particle size of the anode material prepared by the invention ranges from 80nm-180nm, the initial charging/discharging performance achieves 194.4-210.3mAh/g, and the electrochemical performance is excellent.

The invention relates to a modified nickel-cobalt lithium aluminate positive electrode material and a preparation method of the material. The chemical general formula of the material is LiNi(1-a-b)CoaAlbO2/TiO2, wherein a is greater than 0.1 and less than 0.3; b is greater than 0.01 and less than 0.2; 1-a-b is greater than 0 and less than 1; the TiO2 layer is a coating layer; the preparation method of the material comprises the following steps: preparing soluble metal nickel salt, cobalt salt and aluminium salt into a mixed salt solution, preparing the mixed salt solution, NaOH and ammonia water into a mixed alkali solution for reacting, filtering, washing, drying and then roasting the mixed alkali solution for 5-10 hours at the temperature of 400-600 DEG C in the oxygen atmosphere, then carrying out ball milling and uniformly mixing with lithium salt, roasting the mixed alkali solution for 6-16 hours at the high temperature of 800-1000 DEG C in the oxygen atmosphere, coating the mixed alkali solution by titanium dioxide to prepare the modified nickel-cobalt lithium aluminate positive electrode material. The prepared modified ternary positive electrode material of the lithium ion battery is good in electrochemical performance; the dry coating process is free of waste liquid and high-temperature sintering, so that the energy consumption and the cost are reduced.

The invention discloses a preparation method of a Si-C composite material. The preparation method comprises the following steps of: (1) cauterizing Si powder in an oxygen-containing atmosphere to obtain a SiO2-coated Si composite material; (2) mixing the SiO2-coated Si composite material with a carbohydrate, coating the SiO2-coated Si composite material with a carbon precursor by a hydrothermal method, and heating and carbonizing in an inert atmosphere to obtain a carbon-coated composite material which is coated on the SiO2-coated Si composite material; and (3) corroding SiO2 with excessive hydrofluoric acid to obtain the Si-C composite material. The Si-C composite material provided by the invention has electrochemical reversible lithium embedding/extraction property so as to effectively prevent chalking and dropping of the active particles in the charge/discharge process, and also has high lithium storage capacity property of the Si-based material as well as high cycling stability of the C-based material. Therefore, a battery prepared by the Si-C composite material has better cycling performance.

The invention relates to a method for preparing a pyramid array on a monocrystalline silicon substrate, and belongs to the technical field of manufacture of photovoltaic and semiconductor devices. The method comprises the following steps of: covering microballons in periodic arrangement on the surface of a monocrystalline silicon piece, and annealing near the glass transition temperature point of the microballoon; in oxygen atmosphere, obtaining a microballoon array in separation arrangement after etching by use of inductive coupling plasma; depositing a metallic titanium membrane on the monocrystalline silicon piece uniformly by a physical vapor deposition manner; and putting a silicon wafer with a masking film into an alkaline solution containing a surfactant for corrosion so as to obtain the pyramid array in order arrangement. The method is simple in process, short in preparation period and mature in technology; and three structures such as a positive pyramid array, an inverted pyramid array and a positive and inverted pyramid combined array can be obtained by a method for preparing a template through selecting and fine turning. The method has wide application value in the fields of photovoltaic, magnetic memory devices, nano photoelectric devices, nano sensors, surface raman enhancement and surface plasma effect and the like.

An oxidation process for reducing the data retention loss (DRL) in a FAMOS device comprising the steps of (1) low temperature deposition of a silicon-enriched silicon oxide (130) over a FAMOS transistor gate stack (116) and (2) annealing said silicon-enriched oxide (130) at a high temperature in oxygen atmosphere to convert said silicon-enriched oxide (130) to a thermal oxide. The silicon enriched oxide (130) acts as both an oxygen getter and diffusion barrier during the annealing step.

Disclosed is a process for preparing nitrogen self-doped hierarchical porous oxide in the technical field of functional material by employing biological templates, steps of which comprises 1) selecting fresh biomaterial to fix in glutaraldehyde PBS stationary liquid, 2) soaking the biomaterial, after being rinsed by pure water and fixed, in HCl, then rinsing the biomaterial by distilled water for a plurality of times, soaking the biomaterial in salt solution of metal M, 3) rinsing the biomaterial obtained from step 2) by pure water, soaking in the salt solution of metal M, 4) rinsing the obtained biomaterial from step 3) to obtain biomaterial which is naturally dried, then heating within the range of 500-1000 DEG C in an oxygen atmosphere and insulating to obtain the nitrogen-doped porous oxide N-MxOy. The nitrogen self-doped porous oxide prepared by the invention not only is provided with a biological porous structure, but also effectively realizes nitrogen self-doping, and has the obviously strengthened advantage of capturing and absorbing light wave with different wave ranges.

The invention relates to a preparation method of an aluminum-doped material of a cathode of a lithium ion battery with a solid phase process. The preparation method comprises the following steps: controlling certain reaction conditions to prepare a precursor of a nickel, cobalt and/or manganese hydroxide; uniformly mixing the precursor with a lithium salt and a nanometer aluminum compound; and carrying out high temperature processing for a certain period of time in an air or oxygen atmosphere, cooling, and crushing to obtain the aluminum-doped material of the cathode of the lithium ion battery with the solid phase process. The aluminum-doped material of the cathode of the lithium ion battery with the solid phase process which can substantially improve the safety performance and the cycle characteristic of the lithium ion battery at a high temperature can be applied to power batteries.

The invention discloses a method for preparing a high-nickel ternary cathode material of a lithium ion battery. According to the method, under the existence, a lithium source and a nickel-cobalt-manganese hydroxide/a nickel-cobalt-aluminum hydroxide are used as reaction substrates and are calcined in an oxygen atmosphere to prepare the high-nickel ternary cathode material of the lithium ion battery. According to the method, the dependency on high-concentration oxygen in a preparation process can be reduced; by the use of low-concentration oxygen, the oxygen cost can be lowered, and a requirement on the sealing property of calcining equipment is also reduced, so that the cost is lowered; meanwhile, compared with the high-nickel ternary cathode material of the lithium ion battery, which is prepared by the common method, the high-nickel ternary cathode material of the lithium ion battery, which is prepared by the method disclosed by the invention, is higher in circulating performance and higher in specific capacity.