97results about How to "Even distribution of elements" patented technology

The invention provides a method for synthesizing a lithium ion battery negative electrode material according to a mechanochemical method. The method comprises the following steps of proportioning raw materials in a certain mass ratio, wherein the raw materials include graphite oxide and relatively cheap micron-sized metal powder; carrying out wet ball milling to obtain slurry; naturally drying the slurry; and roasting at medium and low temperature for a short time, thus obtaining the negative electrode material. The method is simple in process, meets the environment requirement, and can be applied to industrial production. According to the prepared negative electrode material, nano-sized particles, high metallic oxide load and good properties can be achieved, and the prepared material is suitable for being used as the battery negative electrode material.

The invention provides a method for preparing a ternary cathode material NCA of a lithium ion battery. The method comprises the following steps: (1) preparing an NCA precursor, namely preparing nickelsalt, cobalt salt and aluminum salt solutions, uniformly mixing the cobalt salt and aluminum salt solutions, adding a spherical template agent into the mixed solution, adding the nickel salt into themixed solution, adding a precipitator solution and the mixed solution in concurrent flow into a reactor so as to react and precipitate, fully reacting, standing, aging, washing the solids after agingtreatment, and performing vacuum drying so as to obtain the NCA precursor; (2) preparing an NCA material, namely fully mixing the NCA precursor of the ternary material and a lithium source, sintering, and crushing the sintered material, thereby obtaining the needed ternary cathode material NCA. Compared with the traditional process, the method disclosed by the invention has the advantages of being uniform in element distribution, short in process time, well controllable in process, simple in operation, environmental-friendly, low in equipment requirements, less in waste of raw materials, highin product quality and the like.

The invention relates to a vanadium-doped nickel-manganese composite hydroxide and a preparation method thereof. The vanadium-doped nickel-manganese composite hydroxide is represented by a general formula Ni < x > Mn < 1-x > Vz (OH) < 2 + a >, wherein x is greater than or equal to 0.1 and less than or equal to 0.9, 0.001 < = z < = 0.01; wherein a is more than or equal to 0.005 and less than or equal to 0.05, the microstructure is determined to be sphere-like by an analytical scanning electron microscope method, the D50 is determined to be 3.0-16.0 mu m by a particle size analysis laser diffraction method, and the specific surface area is determined to be 4.0-13.0 m < 2 > / g by a gas adsorption BET method; the vanadium element is introduced to stabilize the structure of the catalyst; according to the preparation method, atomic-scale mixing of nickel, manganese and vanadium elements is achieved, the obtained vanadium-doped nickel-manganese composite hydroxide has the advantages of being uniform in element distribution, good in sphericity degree and stable in crystal lattice, the problems that in the prior art, vanadium element doping is not uniform, and particles are prone to breakageare solved, and the safety, the cycle performance and the rate performance of the nickel-manganese positive electrode material are further improved.

The invention relates to a method for preparing ceramic micro-spheres of thorium oxide. The method includes dropwise adding ammonia water into thorium nitrate solution to form hydrolysis solution, dropwise adding glacial acetic acid into the hydrolysis solution to regulate the pH (potential of hydrogen) of the hydrolysis solution, and adding polyvinyl alcohol into the hydrolysis solution under stirring conditions to form thorium oxide colloidal solution; dispersing the thorium oxide colloidal solution to obtain liquid drop and allowing the liquid drop to sequentially flow through helium zones, ammonia gas zones and ammonia water zones; arranging dispersed gel particles in strong ammonia water and aging the dispersed gel particles; adding the aged gel particles and deionized water into a hydrothermal reaction kettle and carrying out temperature reaction; placing gel particles into a drying furnace after hydrothermal reaction is carried out on the gel particles, and heating and drying the gel particles under humidity control to form dried gel particles; placing the dried gel particles in a calcination furnace, filling the calcination furnace with air and heating and calcining the gel particles to obtain calcined gel particles; placing the calcined gel particles in a sintering furnace, filling the sintering furnace with air and heating and sintering the calcined gel particles to obtain the ceramic micro-spheres. The method has the advantage that the ceramic micro-spheres of the thorium oxide can be prepared by the aid of simple technologies.

The invention belongs to the field of nanometer semiconductor materials, and discloses a non-layered two-dimensional PbSe crystal material and a preparation method thereof. The preparation method comprises the following steps: (a) selecting a reaction container, marking the reaction container as an upstream region, a central region and a downstream region, selecting Se powder as a selenium source,and placing the Se powder in the upstream region; (b) selecting Pb3O4 as a lead source, mixing the Pb3O4 with potassium chloride so as to obtain a precursor, then placing the precursor in the centralregion, and selecting mica as a growth substrate to be placed in the downstream region; and (c) introducing argon into the reaction container as carrier gas, introducing hydrogen as reaction gas, andcarrying out a reaction under heating so as to obtain the non-layered two-dimensional PbSe crystal material on the mica substrate. The invention also discloses a product prepared by using the method.The method provided by the invention meets the preparation requirements of large-batch two-dimensional nanometer PbSe crystal materials; a product crystal has the advantages of smooth and clean surface, uniform morphology, uniform element distribution, rich and cheap raw materials, simple preparation, and convenience in popularization and large-scale production.

A method for refining a grain capable of dissolving an aluminum alloy material includes the steps of adding an aluminum ingot into an induction heater, obtaining molten aluminum by rising the temperature and fusing, sequentially adding a pre-prepared function alloy, a pre-prepared reinforced alloy, a pre-prepared cryogenic alloy and a pre-prepared activated alloy, fully mixing and conducting hot insulation, obtaining a solution provided with macroscopic and uniform properties, adding a defoaming agent and conducting deslagging process, placing a preheated mould in an oscillating magnetic field, molding and obtaining a casting by conducting mechanical vibration and adopting an external magnetic field with certain magnetic induction intensity, conducting heat treatment after rapid cooling of the casting, and processing the casting into a standard component needed in an experiment. The method for refining the grain capable of dissolving the aluminum alloy material has the characteristics that the strength of the material is improved to meet the requirement for the strength of practical applications.

The invention provides a lithium iron manganese phosphate positive electrode material and a preparation method thereof, which belong to the technical field of lithium batteries. The problems of low gram volume, poor conductivity and the like of an existing lithium iron manganese phosphate material can be solved. The lithium iron manganese phosphate positive electrode material is characterized in that the chemical formula of a main body material is LiMn1-x-yFexMyPO4, x is larger than or equal to 0.1 and smaller than or equal to 0.5, y is larger than or equal to 0.002 and smaller than or equal to 0.02, meanwhile, carbon with the mass fraction being 0.5-3% is contained, and M is one or any combination of Mg, Ni, Co and Zn. A preparation method of a lithium iron manganese phosphate positive electrode material is characterized in that Mn1-x-yFexMyCO3 is prepared through a solution reaction, and then the lithium iron manganese phosphate material is obtained through a solid-phase reaction. The preparation method provided by the invention is rich and cheap in raw materials, simple and convenient in technological process and suitable for industrial production.

The invention discloses a preparation method of a low-density refractory high-entropy alloy cladding layer for laser cladding, the high-entropy alloy is composed of powder of six metal elements of Ti, Al, Mo, Nb, Cr and Zr, the high-entropy alloy is calculated according to the proportion, the mass of each component is accurately weighed, the components are fully and uniformly mixed by using a ball milling technology, the mixture is uniformly pressed on the surface of a base material, and the high-entropy alloy cladding layer is prepared. After drying, a cladding layer can be obtained through laser cladding processing, wherein a matrix material is TC4 (Ti6-Al4-V); after the high-entropy alloy powder is subjected to laser cladding, a cladding layer has good macroscopic morphology, has the characteristics of fine structure, no crack and high bonding strength between the cladding layer and a base material, and has relatively high microhardness. The high-entropy alloy shows a plurality of structure and performance characteristics different from those of traditional alloy, and belongs to the field of materials with academic value and aerospace application potential.

The invention discloses a high-temperature-oxidization-resistant coating material for hot-stamped formed steel and a hot-dipping plating technology. A plating solution comprises the following components in percentage by mass: 5.0-20.0% of Si, 0.5-10.0% of Ni, 0.1-12.0% of Ce, 0.1-2.0% of La, not more than 1.0% of Fe, and the balance of Al and inevitable impurities. According to the coating material, the grain size of the texture can be effectively refined by adding rare earth and other elements in the plating solution; the coating is an Al-Si-Ni-rare earth material, Al and Si elements are main components of the coating and are combined with ferrum to generate a ferro-silicon-aluminum phase and further improve the oxidization resistance capability, the melting point of aluminum silicon can be further improved by Ni, and the grain size of the coating can be refined through the rare earth elements; therefore, the coating has the characteristics that the high-temperature oxidization resistance performance is excellent, the surface is difficult to crack after hot-stamped forming, and the coating is not adhered to a mold. Elements in the coating obtained by adopting the technology are uniformly distributed and organized with high density, are closely combined with a substrate, thus having high high-temperature oxidization resistance performance; during heating process, the high-temperature-oxidization-resistant coating material does not stick a furnace bottom roll, a steel substrate and a stamping mold can be better protected.

The invention relates to a metal-coated foamy copper-based self-supporting lithium cobalt oxide electrode material and a manufacturing method thereof. The manufacturing method of the lithium cobalt oxide electrode material comprises the following steps of S1, preparing Li@ZIF67; S2, carrying out in-situ deposition of Li@ZIF67 on a metal-coated foamy copper substrate; and S3, manufacturing a metal-coated foamy copper-based self-supporting LiCoO2 material. The metal-coated foamy copper substrate of the invention is an important path for charge transmission and storage and is an excellent substrate for supporting an active material. Based on advantages of the ZIF67 precursor and a three-dimensional substrate structure, a metal-coated foamy copper-based self-supporting LiCoO2 material electrode manufactured by the manufacturing method has a large reversible capacity, a high porosity, an excellent rate capability and remarkable cycling stability. And due to remarkable electrochemical performance, the manufacturing method of the metal-coated foamy copper-based self-supporting LiCoO2 material of a nano polyhedron structure can also provide guidance for manufacturing of a leading-edge high-performance flexible lithium ion battery positive electrode material.