59results about How to "Good lamellar structure" patented technology

The invention relates to flake silver powder as well as a preparation method and application thereof.The preparation method comprises the following steps that S1, a silver source is dissolved in deionized water to prepare a solution containing silver ions, a reducing agent is dissolved in the deionized water to obtain a reducing agent solution, and the concentration range of the silver ions in thesolution containing the silver ions is 0.22 mol / L; S2, a pH regulating solution is prepared, the pH regulating solution is added into the solution containing the silver ions, and the pH value of thesolution is regulated to 8-12; S3, a dispersing agent is added into the solution containing the silver ions, and uniform stirring is carried out; S4, at the temperature of 20-60 DEG C, the solution containing the silver ions and the reducing agent solution are fully mixed and reduced in the stirring process to obtain silver particles, part of the reducing agent solution is added into part of the solution containing the silver ions in the mixing process, and after full reduction stirring, the remaining reducing agent solution and the solution containing the silver ions are added into a system at the same time; and continuous stirring and reduction are carried out until the reaction is finished, solid-liquid separation is carried out on the reaction liquid, washing and drying are carried outto obtain the flake silver powder. According to the preparation method, the particle size and the sheet diameter of the prepared silver powder are regulated and controlled, operation is easy, and different use requirements can be met.

The invention provides a flame-retardant, smoke-suppressing and environmentally-friendly PVC low foaming board. The flame-retardant, smoke-suppressing and environmentally-friendly PVC low foaming board comprises, by weight, 100 parts of PVC, 3-6 parts of a heat stabilizer, 0.5-3.2 parts of a lubricant, 6-15 parts of a processing aid, 0.5-1 part of a foaming agent, 29-120 parts of a flame retardant, 5-50 parts of a filler and 0.4-3 parts of a plasticizer, wherein the flame retardant is a compounded flame retardant, the compounded flame retardant comprises zinc borate, aluminum hydroxide, magnesium hydroxide, ammonium octamolybdate and an environmentally-friendly antimony-free flame retardant, and the filler comprises light calcium carbonate. All the flame retardants have synergistic effectsto achieve the flame retardation and smoke suppression purposes with few materials, and cooperate with the light calcium carbonate used as the filler in order to make the flame-retardant, smoke-suppressing and environmentally-friendly PVC low foaming board have good flame retardation and smoke suppression effects, good mechanical properties and good environmental protection property. The flame-retardant, smoke-suppressing and environmentally-friendly PVC low foaming board is produced by raw material proportioning, high-speed mixing, low-speed mixing, twin-screw extruder extrusion, mold molding, cooling setting and cutting processing processes.

The invention discloses a method for rapid synthesis of a multi-element layered positive material of a lithium-ion battery. The method comprises the following steps of: adopting lithium acetate as a lithium source, adopts nitrate or / and acetate of Ni, Co, Mn, Fe and Cr with the melting point of being lower than 200 DEG C as a transition metal source, weighing materials accurately according to the chemical metering ratio of target products, and putting the materials into a corundum crucible (the target products are multi-element positive materials LiMO2 with layered structures, and M is two or more in Ni, Co, Mn, Fe and Cr); heating the materials in an electric furnace or water bath, enabling the materials to be melted to form uniform liquid, then moving the liquid into the constant-temperature electric furnace with the temperature of being 400-600 DEG C, and enabling the liquid to generate combustion reaction; carrying out collection, grinding and 100-mesh sieving on combustion reaction products, pressing into round pieces, putting into a microwave oven, insulating for 5-200 minutes at the temperature of 600-1000 DEG C, and then cooling along with the furnace; and finally, taking out the round pieces, and carrying out grinding and 300-mesh sieving to obtain a target product. The method disclosed by the invention has the advantages that water is not needed, the energy and the time are saved, the process is simple, the operation is easy, and the synthesized multi-element layered positive material has good electrochemical property.

The present invention relates to the liquid phase synthesis process of Ni-rich positive pole material LiNi1-yCoyO2, where y is 0.2-0.3, for lithium ion cell, and is especially one sol-gel process. With cheap citric acid as chelating agent, solution of ethanol solvent and the water solution of Li salt, Ni salt and Co salt are mixed and concentrated through heating and stirring to form gel; the gel is dried, thermally decomposed, sintered at high temperature, cooled and ground to obtain the submicron level lithium nickelate-cobalate powder. Compared with available technology, the present invention has the advantages of less organic solvent consumption, short synthesis period, simple apparatus, environment friendship, and homogeneous product with excellent electric performance.

A powdery coating for engineering machinery is prepared from the following raw materials in percent by weight: 50% of polyester, 15% of a curing agent, 5% of an auxiliary agent and 30% of a filler. The powdery coating for engineering machinery is capable of performing antirust protection on engineering vehicle body, prolonging the service life of a whole machine, obtaining a smooth uniform saturated coating layer, and improving the appearance quality and the protection degrade of a product. The powdery coating has excellent appearance effect, excellent outdoor durability, firm coating-layer hardness and excellent anticorrosion performance and resistance to various chemical solvents.

The invention discloses a doped lithium ion battery high-voltage NCA positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping trivalent element aluminum and divalent element cobalt to replace element nickel in a positive electrode material to obtain an NCA precursor,adding a dopant M into the precursor, and sintering in a high-pressure oxygen atmosphere to obtain the lithium ion battery positive electrode material. The positive electrode material disclosed by theinvention has very high specific discharge capacity and excellent cycle stability, can meet the high-rate charge and discharge requirements, and can be safely cycled for a long time under high voltage; the positive electrode material is prepared by combining four solution parallel-flow coprecipitation with a high-pressure solid-phase synthesis method, and the prepared product is high in purity, high in crystallization quality, high in product particle density, uniform in distribution, excellent in electrochemical performance and low in manufacturing cost, is an ideal positive electrode material with high energy density and has a wide application prospect.

The invention discloses a method for preparing a covalent organic polymer by a reaction mill, wherein the method is applied to development and preparation of catalysts for energy device related reaction processes, such as oxygen reduction reaction ORR, oxygen evolution reaction OER and the like. The method comprises the following steps: placing monomers containing functional groups capable of generating covalent bonds in a reaction mill pot, to obtain a covalent organic polymer after grinding for a period of time at a certain frequency, and carbonizing at high temperature to obtain the catalyst which can be applied in an electrochemical process. The method has the advantages of simple process, convenient operation, precious little solvent consumption, no pollution, safety and environmentalprotection, and can be used for macroscopic-quantity preparation of the covalent organic polymer to meet commercial applications.

The invention discloses an ultrahigh-solid-content and high-durability environment-friendly low-surface-treatment epoxy high-build coating and a preparation method thereof, and relates to the technical field of metal surface anti-corrosion treatment. The preparation method comprises the following steps of: well stirring medium-viscosity epoxy resin, low-viscosity epoxy resin, unsaturated polyester resin, acetone, ethanol, modified zinc phosphate, iron oxide red, aluminum paste, mica iron oxide, filler, an adhesion promoter, a high-efficiency dispersant and other auxiliaries in a stirrer, adjusting the viscosity, and mixing a curing agent before construction. The low-surface-treatment coating prepared by the invention is convenient to construct, realizes green application and green use of the green coating, and is suitable for anti-corrosion maintenance of various steel structures and new steel structures.

The invention provides a cold cathode structure based on a graphene oxide / graphene micro emission area and a preparation method thereof. The cold cathode structure comprises a silicon substrate, a ZnOnano-array which is vertically arranged and grows on the silicon substrate, and a surface emission layer coated on the top of the ZnO nano-array. The surface emission layer is composed of graphene oxide blocks and graphene blocks, wherein the graphene oxide blocks and the graphene blocks are integrally arranged. The graphene oxide blocks are arranged horizontally and longitudinally at intervals,and the remaining areas are filled with the graphene blocks. The graphene oxide blocks and graphene blocks with different thicknesses and degrees of reduction form the micro emission area. The methodcomprises the steps that an electrophoretic deposition technology is used to prepare a GO layer on the top of the one-dimensional ZnO nano-array; GO is reverted to graphene by using magnetron sputtering zinc oxide; the graphene layer is thinned by using hydrochloric acid to etch zinc; and the GO / G alternated micro region is acquired on the top of the ZnO nano-array through multiple mask sputteringand etching.

The invention discloses low-melting-point SnBi alloy-copper composite electronic slurry, which comprises the following components by weight: 55-85% of mixed conductive phase, 5-15% of tin-bismuth alloy powder, 10-25% of organic carrier, and additives consisting of 0-0.5% of La and 0-4.5% of Ga, with the total percent being 100%. The invention also discloses a preparing method of the low-melting-point SnBi alloy-copper composite electronic slurry and a printing method of the low-melting-point SnBi alloy-copper composite electronic slurry. The low-melting-point SnBi alloy-copper composite electronic slurry and the preparing and printing applications thereof have the advantages of simple process route, easy availability of raw materials, low production cost, no lead and cadmium components, and no pollution.

The invention provides a positive electrode material, a preparation method thereof and a secondary lithium battery. The positive electrode material is characterized in that the chemical general formula of the positive electrode material is LibNi1-x-yCoxAlyMzO2, b is more than or equal to 0.95 and less than or equal to 1.10, x is more than or equal to 0 and less than or equal to 0.15, y is more than or equal to 0.01 and less than or equal to 0.1, z is more than 0 and less than or equal to 0.05, and the element M is a metal element; M elements are distributed inside and on the surface layer of the positive electrode material, the M elements distributed inside the positive electrode material exist in a doping form, and the M elements distributed on the surface layer of the positive electrode material exist in a coating layer form formed by M oxide and / or lithium M composite oxide; and the molar ratio of the internal M element to the surface layer M element is greater than 0.5. The positive electrode material provided by the invention has good high rate capability and thermal stability.

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt hydrotalcite-like compound and a preparation method thereof. A constant pH precipitation method is adopted, cobalt nitrate serves as a cobalt source, a mixed solution of methyl alcohol and water (the volume ratio is 1: 1-8: 1) serves as a solvent, the cobalt nitrate solution is slowly dropwise added into a sodium carbonate solution at the room temperature, the pH of the solution is adjusted to be 8-12, and the pure cobalt hydrotalcite is obtained through the steps of hydrothermal aging, suction filtration, washing, drying and the like. The hydrotalcite-like compound is single in crystalline phase, regular in structure and good in layered structure and flaky morphology, the average thickness of nanosheets ranges from 5.9 nm to 12.8 nm, and the high crystallinity degree is achieved. The preparation process is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the period is short, the purity and the yield of the hydrotalcite-like compound are high, and quantitative synthesis can be realized.

The invention discloses a preparation process of a ceramic sheet. According to the process, the ceramic blank film is firstly prepared, the influence of local defects on the performance of the ceramicsheet is reduced through a multi-layer overlapping process, the yield and the consistency of products are improved, and the reinforcing and toughening effects of additives such as whiskers can be fully exerted through cross overlapping in the overlapping process. The ceramic sheet prepared by the process is excellent in layered structure and low in water absorption rate, and the toughness of theceramic sheet is improved by 30-50% compared with that of a ceramic plate with the same thickness prepared by a traditional dry pressing method.

The invention discloses a nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer and a preparation method and application thereof. The preparation method comprises the steps that shrimp shell pretreatment is conducted, by taking urea or melamine or pyrrole as a nitrogen source and taking shrimp shells subjected to treatment as a raw material, under inert gas flow, low-temperature pre-carbonization is conducted, then, high-temperature pyrolysis is conducted with alkaline matter, acid treatment is conducted at last, and the nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer is obtained. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer prepared through the method has a unique nano ultrathin carbon layer structure, a high specific surface area and a total pore volume, is simple in technology, low in cost, friendly to environment, and has good physical and chemical properties. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer can be applied to a supercapacitor, a secondary battery and gas absorption, and a new way for developing new energy biomass materials is opened up.

The invention provides a cathode material of a Li-ion secondary battery, the general formula is LiNiaMnbCocO2-XFX, wherein the relationships that a is more than or equal to 0.1 and less than or equal to 0.45, b is more than or equal to 0.1 and less than or equal to 0.45, c is more than or equal to 0.1 and less than or equal to 0.45 and a+b+c=1 are satisfied; the relationship that X is more than or equal to 0.001 and less than or equal to 0.2 is satisfied; Li-Ni-Mn-Co-Fl composite oxide is in an R-3m rhombus lamellar structure; and in XRD, the value of R is 0.25-0.42. The invention also discloses a preparation method of the cathode material, which comprises the following steps: adding the mixed solution of nickel salt, cobalt salt and manganese salt and precipitator solution containing fluorion into an agitated reactor to react and precipitate; after the reaction is completed, washing and drying the precipitation, and preparing the precipitation into a precursor; mixing the precursor and composite containing lithium in the proportion of mass of 1:1 to 1.1; and sintering in the environment atmosphere containing oxygen at a high temperature. The cathode material provided by the invention has good cycle performance and easy control of metal ion precipitation.

The invention relates to a preparation method of a high-dispersion supported nano metal Fe-based catalyst and belongs to the technical field of Fe-based catalysts. According to the preparation method, an Mg-LDHs precursor containing an iron coordination ion intercalation is prepared by virtue of an intercalation assembly method; and then, with methane as an air source, iron nano particles are further reduced and multiwalled carbon nano tubes grow out simultaneously in one step by virtue of a chemical vapor deposition method, and thus the magnalium composite metal oxide supported high-dispersion iron-based catalyst containing the iron nano particles coated with the multiwalled carbon nano tubes. The high-dispersion supported nano metal Fe-based catalyst is structurally characterized in that the iron nano particles are supported on the surface of the magnalium composite metal oxide after being coated with the multiwalled carbon nano tubes. By utilizing the preparation method, the chemical stability of active nano metal particles is improved, the gather of the active nano particles is restrained, and the structure stability of the catalyst is improved due to the strong interaction between the multiwalled carbon nano tubes and the iron nano particles. When used as a fenton-like catalyst, the high-dispersion supported nano metal Fe-based catalyst shows good catalytic oxidation performance to organic dyestuff methylene blue, the degradation rate reaches 95.0-100%, and the high-dispersion supported nano metal Fe-based catalyst has potential practical application value.

The invention relates to a positive electrode material and a preparation method thereof, and a lithium ion battery, the chemical general formula of the positive electrode material is as shown in the formula (1): LiaNimConM1-m-nO2 (1), in the formula, 1.000 < = a < = 1.015, 0.9 < = m < = 1.0, 0 < = n < = 0.1, and a = x + y + z, M comprises at least one of transition metal elements, II main group elements and III main group elements, x represents the molar ratio of lattice lithium to metal elements in the positive electrode material, y represents the molar ratio of lattice lithium to metal elements in the positive electrode material, and z represents the molar ratio of lattice lithium to metal elements in the positive electrode material. X is equal to 0.984 to 0.990; y represents the molar ratio of active lithium to metal elements of the positive electrode material, and y is equal to 0.010-0.020; z represents the molar ratio of surface free lithium to metal elements in the positive electrode material, and z is equal to 0.010-0.015; wherein the metal element comprises the sum of Ni, Co and M. According to the invention, by regulating and controlling the structural composition of the stoichiometric ratio lithium content of the positive electrode material, effective regulation and control of the first efficiency and the cycle stability of the positive electrode material are realized.