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

The invention provides a preparation method of a lithium ion battery cathode material. The prepared lithium ion battery cathode material has good pseudo-single crystal form by utilizing pressure-boiling crystal at certain temperature. The preparation method is simple in technology and easy in control. The general formula of the lithium ion battery cathode material prepared by the preparation method is expressed as Li (NixCo1-x-yMny) O2, wherein x is more than or equal to 0.34 and is less than or equal to 0.68, y is more than or equal to 0.15 and is less than or equal to 0.31, x +y is more than 0 and is less than 1. The invention also provides a lithium ion battery containing the lithium ion battery cathode material.

The invention relates to a slag system for smelting GH984G nickel base alloys and an application method thereof. The slag system comprises the following components in percentage by weight: 25-30% of CaO, 20-25% of Al2O3, 2-5% of MgO, 4-7% of TiO2, 1-3% of SiO2 and the balance of CaF2. The slag system is suitable for smelting GH984G high-temperature alloys through remelting of T-shaped crystallizeringot extracting electroslag. The slag system can preferably solve the problems of nonuniform distribution of easy-oxidized elements at the heads and the tails of ingots in the process of smelting the GH984G high-temperature alloys through remelting of the ingot extracting electroslag and weaker surface quality of ingots.

This invention relates to one sampling method for X ray spectrum analysis of carbon silicon materials, which comprises the following steps: processing mixture of oxygen agent; processing fuse hanging bottom foil pot; pulling the mixture carbon silicon anti-fire materials sample ad mixture oxygen agent into the pot; putting the pot onto high temperature chamber for heating of oxidation in low temperature to process the glass rollers for the spectrum analysis for X ray.

The invention discloses a method for preparing a titanium dioxide and graphene dual-layer co-coated core-shell-structured positive electrode material of a lithium-sulfur battery by a one-step method, relates to a preparation method for the positive electrode material of the lithium-sulfur battery, and aims to solve the technical problems of a complex preparation method of a graphene-coated sulfur material and limitation in limiting a shuttle effect of polysulfide of the existing positive electrode material of the lithium-sulfur battery. The preparation method comprises the steps of 1, preparing graphene oxide paste; and 2, performing mixing and ball milling, freezing and reducing, and vacuum drying. According to the method, titanium dioxide is added to an electrode material, so that diffusion and dissolving of polysulfide can be effectively limited through chemical bonds of titanium dioxide and polysulfide; however, the conventional hydrothermal method and chemical vapor deposition method and the like cannot facilitate industrial production of the material; and the hydrophilic nanometer titanium dioxide is adopted by the method, and the material is prepared by the simple process of ball milling, so that possibility is provided for industrial production.

The invention provides a 3D additive-manufacturing bilateral laser welding method for a T-shaped structure, relates to a double-laser-beam welding method, and aims to solve the problems that under the conditions of high welding speed and long weld beads, in a bilateral laser welding process of a T-shaped structure, the circumstance that welding wires are continuously and stably fed into a molten pool at constant speed and even, coherent and non-defective bilateral weld joints are obtained by one-time welding is difficult to ensure, and alloy of weld microstructures is difficult to regulate and control specifically and flexibly. The method comprises the following steps: 1, chemically cleaning the surface of a stringer; 2, designing of a sedimentary layer: designing the sedimentary layer in a region to be welded on the surface of the stringer, wherein the cross section of the sedimentary layer is square or rectangular; 3, vertically placing a laser cladding head at a position right above the region to be welded on the surface of the stringer, carrying out laser 3D additive-manufacturing on regions to be welded on two sides of the stringer to obtain the sedimentary layer in a mode of coaxially feeding laser beams and alloy powder; and 4, carrying out bilateral laser welding on the stringer and an envelope to obtain bilateral symmetric weld joints. The 3D additive-manufacturing bilateral laser welding method for the T-shaped structure is used for double-laser welding of the T-shaped structure.

The invention relates to a sulfide target cosputtering preparation method of a CZTSSe film and a product thereof. The cosputtering preparation method of a copper-zinc-tin-sulfur-selenium (Cu2ZnSn(SSe)4, CZTSSe for short) film absorption layer comprises the following steps: (1) preparing a Cu-Zn-Sn-S precursor prefabricated film on a soda-lime glass substrate by using a sulfide target by a cosputtering technique; (2) carrying out direct vulcanization-free high-temperature annealing treatment on the Cu-Zn-Sn-S precursor prefabricated film obtained by cosputtering to prepare a copper-zinc-tin-sulfur (Cu2ZnSnS4, CZTS for short) film absorption layer; and (3) preparing the Cu-Zn-Sn-S precursor prefabricated film by using the optimized preparation scheme in the step (2), and preparing the CZTSSe film absorption layer by using a solid selenium source (Se powder) selenizing annealing technique. The product CZTS/CZTSSe film has higher photoabsorption coefficient, and is an ideal film solar cell material.

The invention provides an aluminium alloy smelting device which comprises a smelting mechanism, a stirring mechanism, a conveying mechanism and a temperature control mechanism, wherein the smelting mechanism comprises a resistance type crucible smelting furnace, a furnace lid located above the smelting furnace, a first hydraulic cylinder connected with the furnace lid and a graphite crucible located in the smelting furnace; aluminum liquid is contained in the crucible; the stirring mechanism comprises a graphite bell jar; the top end of the graphite bell jar is connected with a motor through a connector and a transmission system which are located on a mounting plate; a second hydraulic cylinder is arranged on the mounting plate; the conveying mechanism comprises an air compressor and a conveying pipe; a feeding tank is mounted between the air compressor and the conveying pipe; the tail end of the conveying pipe is connected with a through hole in the graphite bell jar; the temperature control mechanism comprises an internal thermocouple and an external thermocouple; the internal thermocouple penetrates through the resistance type crucible smelting furnace and is communicated with the interior of the furnace; and the external thermocouple passes through the interior of the graphite bell jar and is connected with the aluminum liquid. Through the design and use of the structure, the stability of ingot quality can be guaranteed, so that the stability and reliability of later-period experiment data are guaranteed.

The invention relates to a composite cathode material for a lithium ion battery and a preparation method of the composite cathode material. The composite cathode material has a chemical formula: Li a Ni x Co y Mn 1-x-y O2 (b)MO, wherein the b/a is greater than or equal to 0.005 but is smaller than or equal to 0.1. The preparation method comprises the steps that: 1, hydroxide is coated on the surface of a multi-element material of Li a Ni x Co y Mn 1-x-y O2 through a wet process; and 2, the composite cathode material of Li a Ni x Co y Mn 1-x-y O2 (b)MO is prepared through high-temperature calcinations, wherein the b/a is greater than or equal to 0.005 but is smaller than or equal to 0.1. The composite cathode material and the preparation process have the advantages that the element distribution of the material is uniform, the surface metal oxide exists, the direct contact of the composite cathode material with electrolyte is avoided, the worsening reaction is reduced, and the cycle service life of the battery is effectively prolonged.

The invention provides a novel Cd-Te based thermoelectric material and a preparation method thereof. The Cd-Te matrix of the Cd-Te based thermoelectric material is doped with a halogen and/or a positive-trivalent metal element, and/or compounded with a conductive simple substance or a conductive compound or a combination of the conductive simple substance and the conductive compound. The preparation method comprises the following steps: heating Te, Cd, the doped raw material and/or the composite raw material under a vacuum high temperature condition to obtain a mixture, cooling the mixture, grinding the mixture to form powder, and sintering the powder to obtain the thermoelectric material. The novel thermoelectric material provided in the invention for the first time has the advantages of uniform element distribution, bulkiness, polycrystal, simple preparation technology and short preparation time.

The invention belongs to the field of new energy materials, and particularly relates to a nickel/cobalt-rich high-entropy ceramic positive electrode material for a lithium ion battery and a preparation method thereof. The chemical formula of the nickel-cobalt-rich high-entropy ceramic positive electrode material is LiNixCoyA(1-x-y)/nB(1-x-y)/nC(1-x-y)/nD(1-x-y)/n...O2, wherein 0.4 < = x < = 0.8 and 0.1 < = y < = 0.3, and the proportion is the ratio of the amount of substance; the A, B, C and D are selected from Mn, Zn, Mg and Al, and the n is 3 or 4. A preparation method comprises the following steps: (1) preparing a metal salt aqueous solution in proportion, adding the metal salt aqueous solution, a complexing agent and alkali into a reaction container in a certain proportion, controllingthe pH value to be constant to obtain a precipitate, and washing the precipitate to obtain a product precursor; (2) mixing and roasting the precursor and a lithium salt to finally obtain a positive electrode material. The nickel/cobalt-rich high-entropy system can effectively improve the performance of the positive electrode material.

A method for preparing the precursor of the anode material for a lithium battery is characterized in that the preparation process comprises the steps of preparing a metal salt solution with the total metal ion concentration of 0.1 to 3mol/L according to the stoichiometric proportion of corresponding metal salts and the prepared precursor composite hydroxid; adding a sodium hydroxide solution with the concentration of 0.1 to 5mol/L to the metal salt solution; and reacting under the condition of inert gases to obtain the precursor composite hydroxid. The protection by the inert gases effectively prevents the oxidation of Mn and the generation of Alpha type hydrous hydroxide, so as to prepare the pure phase composite hydroxid precursor with the Beta-Ni(OH)2 type structure. The precursor has evenly distributed elements, good electrochemical activity and is favorable for preparing high-performance anode materials.

The invention discloses a negative and positive ion co-doped monocrystal-like ternary positive electrode material and a preparation method thereof. The general formula of the negative and positive ion co-doped monocrystal-like ternary positive electrode material is LiNi<0.8-x>Co0.15Al0.05MxO<2-y>Vy, wherein 0.01<=x<=0.03, 0.01<=y<=0.04, M is one of Zn, Mg and Cu elements, and V is one of F, Br and Cl elements. The preparation method comprises the following steps: firstly, preparing a precursor of a cationic M-doped ternary positive electrode material by adopting a sol-gel method, then carrying out the ball-milling and uniform mixing of the precursor with lithium salt (lithium salt for providing lithium element), and carrying out high-temperature roasting to obtain the negative and positive ion co-doped monocrystal-like ternary positive electrode material. The ternary positive electrode material of the lithium ion battery prepared by the invention has the advantages of fine and uniform particles, low specific surface area, low cationic mixing degree, good crystallinity, good cycling stability and good initial coulombic efficiency.

The invention relates to a slag system for smelting a GH3625 nickel-base alloy containing rare earth Ce and an electroslag remelting smelting method thereof. The slag system comprises, by weight, 20-25% of CaO, 17-21% of Al2O3, 5-7% of NaF, 3-5% of MgO, 1-2% of TiO2, 4-6% of CeO2, 1-2% of SiO2, and the balance CaF2. The slag system is suitable for electroslag remelting smelting of the GH3625 alloycontaining rare earth, and the problem of Ce, Al and Ti burning loss in the process of electroslag remelting smelting of the GH3625 alloy containing Ce can be well solved.

The invention relates to a method for measuring the content of heavy metal in soil by a hand-held X-ray fluorescence spectrometer. The method comprises the following steps: 1) take an appropriate quantity of a soil standard sample and a to-be-tested soil sample, then drying the soil standard sample and to-be-tested soil sample, and pressing the dry soil standard sample and to-be-tested soil sample under 32-35 t for 32-35 s to obtain the soil standard sample and the to-be-tested soil sample; 2) drawing a calibration curve according to the linear relationship between strength and content; 3) opening the hand-held X-ray fluorescence spectrometer, preheating the hand-held X-ray fluorescence spectrometer for 20-25 min, then testing the soil standard sample and the to-be-tested soil sample, and comparing a result with the calibration curve to obtain the content of the heavy metal in the to-be-tested soil sample. The method has the advantages that the method is simple, operation is easy, analysis time is greatly shortened, the measurement result is accurate, and precision is high.

The invention provides a preparation method of an yttrium-doped antimony telluride phase changing material. The preparation method of the yttrium-doped antimony telluride phase changing material Y<x>Sb<2-x>Te<3> comprises the steps of 1) enabling raw materials Y(NO<3>)<3>.6H<2>O, SbCl<3> and TeO<2> to be dissolved into a mixed solvent of dilute ammonia water and absolute ethyl alcohol to obtain aprecursor, wherein the molar ratio of Y(NO<3>)<3>.6H<2>O to SbCl<3> to TeO<2> is x: 2-x: 3 (x is greater than or equal to 0 and less than or equal to 0.33); 2) transferring the precursor obtained in the step 1) into a reaction kettle, adding NaBH<4>, next, heating to 160-200 DEG C, performing thermal insulation for 18-24h, then cooling to the room temperature, and next, separating out precipitates; and 3) performing alternate washing and filtering on the precipitates by deionized water and ethyl alcohol and then carrying out vacuum constant temperature drying to obtain the yttrium-doped antimony telluride phase changing material. The preparation method disclosed in the invention has the characteristics of low cost of raw materials, simple process, low equipment cost, safety and no pollution and the like; and the prepared phase change material is small in granularity, high in purity and uniform in element distribution.

The invention belongs to the technical field of material preparation, and particularly relates to a mechanical alloying preparation method of a Ti-22Al-25Nb (at.%) solid solution. The method comprisesthe following steps that S1, weighing is carried out according to the element ratio of the solid solution, wherein Ti powder, Al powder and Nb powder are weighted according to the atomic ratio of 53: 22 : 25 ; S2, the weighed three kinds of element powder are added into a ball milling tank, and stainless steel grinding balls are added according to a ball material ratio of 6 : 1 to 9 : 1; S3, theball milling tank is vacuumized, and then is filled with argon; S4, the ball milling tank is placed on a ball mill for low-energy mixed powder ball milling; S5, the ball milling tank performs high-energy ball milling on the ball mill; S6, the ball milling tank is allowed to be subject to standing for 24 hours in an argon glove box, then an upper cover of the ball milling tank is opened for passivation, and the passivation time is not less than 24 hours; and S7, the powder and the grinding balls are sieved and separated in the argon glove box to obtain Ti-22Al-25Nb (at.%) solid solution powder. According to the method, no process control agent is added so that the pollution to the powder can be prevented, and the mechanical alloying efficiency can be improved.

The invention discloses manganese ferrous phosphate and a preparation method and application thereof, wherein the preparation method comprises the following steps: dissolving divalent manganese salt and divalent iron salt in water to obtain a mixed salt solution of manganese salt and iron salt; adding a phosphorus source into the mixed salt solution to obtain a precursor solution; adding alkali into the precursor solution for co-precipitation to prepare ferrous phosphate manganese slurry, which contains ferrous phosphate precipitates and ferromanganese phosphate precipitates; and washing, filtering and drying the manganese ferrous phosphate slurry to obtain manganese ferrous phosphate. According to the preparation method of the manganese ferrous phosphate, nitrogen does not need to be introduced, so that nitrogen oxide waste gas cannot be generated, and environmental pollution cannot be caused. Besides, the proportion of iron, phosphorus and manganese in the manganese ferrous phosphate prepared by the preparation method of the manganese ferrous phosphate is stable, the impurity content is low, and the requirements of a lithium iron manganese phosphate positive electrode material on a precursor raw material can be met.

The invention relates to a nickel molybdenum titanium intermediate alloy. The alloy comprises the following components in percentage by weight: 68-72% of Ni, 28-32% of Mo, and 0.4-0.6% of Ti. A preparation method comprises the following steps of: firstly, calculating and weighing the required raw materials according to the components of the alloy; secondly, putting the raw materials into a crucible of a medium-frequency induction furnace, wherein the raw material of nickel and the raw material of molybdenum are in crossed placement, and the raw material of titanium is put at the gap of the two raw materials; thirdly, after low vacuum degree medium-frequency induction melting, casting into cylindrical ingots at 1300-1350 DEG C; fourthly, turning the cylindrical ingots into scraps. The added titanium element is conductive to overcoming the defect that the intermediate alloy is mingled with high-density molybdenum, the chemical components of the prepared nickel molybdenum titanium intermediate alloy are stable and uniform, the deviation of the main components is not more than 0.5%, and the preparation method is conductive to producing excellent titanium alloy ingots which are segregation-free and have no metallurgy mingling defect and comprise uniformly distributed elements of molybdenum and nickel.

The invention relates to a preparation method of a high-performance spherical lithium nickel cobalt aluminate anode material. The preparation method comprises the following steps: dissolving aluminum salt in a sodium hydroxide solution; preparing a nickel salt aqueous solution, a cobalt salt solution, acetylacetone, a nickel-cobalt salt complexing agent, an ammonia-water solution and a precipitator solution for later use; adding the solutions into a reaction kettle at the same time by controlling molar weights of aluminum, nickel and cobalt, and controlling a molar ratio of aluminum salt to the acetylacetone and a molar ratio of nickel and cobalt salt to the nickel-cobalt complexing agent; at 30 to 80 DEG C, keeping the reaction for 20 to 80 hours, and performing aging reaction for 10 to 20 hours; centrifugally filtering reaction liquid, thus obtaining a preliminary filter cake, adding the preliminary filter cake into a sodium carbonate solution for stirring and washing, then performing centrifugal filtering, thus obtaining a secondary filter cake, then repeatedly washing and filtering the secondary filter cake with distilled water till the pH of filtrate is smaller than 9, and obtaining a final filter cake; drying the final filter cake, thus obtaining a precursor; mixing the precursor with lithium, sintering the precursor in a rotary sintering furnace under the existence of oxygen, thus obtaining the lithium nickel cobalt aluminate anode material.

The invention belongs to the technical field of nano material preparation, and discloses a hydrolysis-hydrothermal method for preparing scandium-cerium-ytterbium doped zirconium oxide ultrafine powder. The method comprises the following steps: firstly, preparing a reaction mother solution containing zirconium, cerium, scandium and ytterbium elements, and then heating the reaction mother solution to 100-104 DEG C for hydrolysis reaction to obtain milk white hydrolysis slurry; cooling to 50-70 DEG C, adding ammonia water to adjust the pH value to 3.6-4, then adding a mineralizer, heating to 90-100 DEG C, carrying out a hydrothermal reaction, and washing and drying a product to obtain coarse powder; and successively carrying out two-step calcination on the obtained coarse powder at 600-800 DEG C and 900-1100 DEG C, crushing and granulating to obtain the scandium-cerium-ytterbium doped zirconium oxide ultrafine powder. The powder obtained by adopting the preparation method disclosed by the invention is uniform in particle size, uniform in element distribution and stable in physicochemical property. And the process flow is simple, the hydrothermal hydrolysis process is easy to directly observe, the process is controllable, and the method is suitable for large-scale industrial production.