277results about How to "The process is simple and controllable" patented technology

The invention relates to a hydrothermal synthesis method for lithium ferromanganese phosphate anode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. The method has the following processing steps of: step 1, preparing LiMnxFe1-xPO4 through a hydrothermal synthesis reaction: mixing an aqueous lithium hydroxide solution, an aqueous ferrous sulfate solution and phosphoric acid under a stirring condition, after sealing, heating to 150 DEG C to 180 DEG C within 0.5 to 2 h, reacting for 0.5-4 h under the pressure of 0.48-1.0 Mpa, cooling to less than 80 DEG C, and filtering; step 2, mixing with organic matters and drying: mixing a wet filter cake with a soluble carbon source organic matter, and carrying out spray drying or expansion drying; and step 3, carrying out carbon-coated processing: roasting LiMnxFe1-xPO4 carbon source compound powder at a temperature between 600 DEG C and 750 DEG C for 4-6 h under an insert gas condition, and cooling to less than 150 DEG C to obtain a carbon-coated lithium ferromanganese phosphate anode material of the lithium ion battery. The hydrothermal synthesis method disclosed by the invention has the advantages of simple and controllable technology, convenience for operation, low cost, high crystallization degree of products, uniform dispersion, high specific capacity, high conservation rate of the cycling capacity, and the like.

The invention discloses a silver zinc oxide electric contact material and a preparation method thereof, and belongs to the technical field of electrical materials. The method comprises the following steps of: melting and ingoting silver, zinc and additives in a smelter according to a certain weight ratio, sintering and extruding into strips, and drawing to form a silver-zinc alloy wire material; oxidizing the silver-zinc alloy wire material to obtain a silver zinc oxide wire material; cutting the wire material into pieces by an open-back inclinable press, pressing the cut pieces in a steel die to manufacture an extruded stock, and sintering and extruding the cut pieces to manufacture a plate or a wire material; polishing the surface of the extruded plate, performing hot rolling on silver, rolling, punching and molding; and drawing, annealing and drawing the extruded wire material to a finished product wire material with phi of between 0.5 and 3.0mm to produce the rivet electric contact. In the method, the silver-zinc wire material is used for oxidation, so the alloy is easily oxidized without special oxidizing equipment; the metallographic phase of the material has uniform tissue without an oxidation zinc lean region or oxidation aggregation, and the consistency of the material performance, high compactness and good processing performance can be ensured; the method can realize mass production and has low production cost; and the production process and the material per se have no pollution to the environment.

The invention discloses a construction method for cropping a bridge pile foundation at a sandy gravel stratum of an abyssal region. A passive underpinning principle is adopted; firstly, an enclosing structure is constructed behind an existing bridge abutment by a certain distance, and a temporary cofferdam is constructed in a river, so that operation space is provided; an underpinning pile foundation and an underpinning bearing table are constructed in the enclosing structure, and dead loads of an existing bridge is transferred to an underpinning pile and the underpinning bearing table; and a pile breaking channel is dug below the underpinning bearing table, and the pile is finally removed with a manual hole digging method. According to the method, on the premise that the construction quality is guaranteed, the construction schedule can be quickened, the manufacturing cost is reduced, and influences of underpinning construction on existing buildings, pipes and ground transportation are reduced; and the construction method has the technical advancement and has social benefits and economic benefits.

The invention belongs to the field of 3D printers and provides a 3D printed PLA consumable and a preparation method thereof. The 3D printed PLA consumable is prepared from the following raw materials in percentage by weight: 99.3-99.7% of PLA plastic, 0.1-0.3% of pigments and 0.2-0.4% of auxiliaries. The preparation method comprises the following steps: weighing the components in percentage by weight; uniformly mixing the weighed components to obtain a mixture; adding the obtained mixture into a double screw extruder; coupling and extruding to obtain PLA colored plastic particles; and then adding the PLA colored plastic particles into a 3D twine machine to prepare the 3D printed PLA consumable. According to the 3D printed PLA consumable, a high-quality, environment-friendly and naturally degradable PLA product is manufactured by utilizing PLA plastic on the premise that the environment-friendly degrading advantage of the PLA plastic is not changed, and the preparation method is simple in step, easy to control and low in cost.

The invention relates to a method for preparing a lithium ion battery positive electrode material, specifically a lithium iron phosphate / carbon composite material by thickener doping modification, and provides an improvement method for the problems that lithium iron phosphate particles are not uniform, strength of a surface carbon coating layer is unstable, and the like in the prior art. The method has the technical characteristics that a water-soluble organic carbon resource or a conductive carbon black is added in a prepared water solution of the thickener with a certain concentration under mechanical stirring; then precursor powder is added with stirring; and finally the obtained slurry is dried and heat-treated at a high temperature to obtain doped high-performance Li1-xMxFePO4 / C powder with consistent particle morphologies. The method is simple in process, convenient for operations and easy for industrialized production and has relatively wide application prospects.

The invention belongs to the technical field of new materials for a lithium ion battery, and particularly relates to a preparation method of a silicon-based / graphene composite. The preparation method comprises the following steps of: taking a pole of the silicon-based / graphene composite as a working electrode and the pole of a lithium source-containing material as a counter electrode, assembling a battery together with propylene carbonate and lithium salt-containing electrolyte and a diaphragm; charging and discharging the battery to co-embed lithium ions and carbonate propylene ester into graphite layers under the action of electric field, so as to enable the graphite layers to be stripped; dismantling the battery, placing a lithium-embedded silicon-based / graphene composite precursor into dimethyl carbonate solution for soaking, and vaccumizing and drying; and conducting ultrasonic cleaning and lithium removal in diluted hydrochloric acid, vacuumizing and filtering, drying, and burning under inert gas atmosphere. Compared with the prior art, the preparation method is simple and controllable in procedures, low in cost, safe and environment-friendly and incapable of causing environment and health security risk; and a great deal of hydrogen can also be collected in the preparation process of the composite, so that economic benefits are obvious.

The invention provides a method for preparing a silver tin oxide material. The method comprises the following steps: (1) preparing raw materials, wherein the raw materials are base stocks or mixture of the base stocks and additives; (2) performing intermediate frequency smelting on the raw materials, and performing oxidation treatment while water atomization is performed to obtain alloy powder; (3) drying and sieving the alloy powder, and enabling the alloy powder to form an isostatic pressing ingot blank after isostatic pressing; and (4) burning the isostatic pressing ingot blank in a hydrogen heating furnace, performing thermal extrusion on the burnt ingot blank, and extruding panels or wire stocks made of silver tin oxide materials. By means of the method for preparing the silver tin oxide material, oxidization is finished in an atomization process, the oxidization of the powder is full, the tissue is even, and processing performance of the material is improved; the content of oxide in a material system can be improved to 20%, and using requirements of large-current electrical equipment are met; and the preparation method of the material is free of environment pollution, the technological process is easy to control, the production period is short, and stable large-volume production can be achieved.

A high-voltage lithium-ion battery cathode material includes LiNi0.5-xMn1.5MxO4 (0≦x≦0.2, M═Mg, Zn, Co. Cu, Fe, Ti, Zr, Ru, and Cr), which is coated with a coating material, which may be a carbon coating material, a metal phosphate coating material, or a combination thereof. The carbon coating material may be acetylene black, graphene oxide, conductive graphite, glucose, sucrose, starch, lactose, maltose, phenolic resins, polyvinyl alcohol, or a combination thereof, and the metal phosphate coating material may be FePO4, LiFePO4, CoPO4, Mn3(PO4)2, LnPO4. The coating material may account for 1 to 10% (wt %). Products of the present invention have high reversible capacities. Synthesis methods are disclosed that are simple and controllable, can produce uniform coating, and are suitable for industrial scale production.

A method of preparing silver copper oxide electrical contact material is disclosed. The raw material composition, particle size, weight percentage are in that: base metal: silver powder and copper oxide powder have powder particle size of 1.5 mu m -50 mu m, copper oxide powder takes the quantity of more than 2%-25%, based on total weight, the rest is silver; additive: bismuth oxide does not exceed 0.9% of the total weight, nickel oxide does not exceed 1% of total weight. Raw material is surface treated, after batching, the raw material is mixed uniformly in a powder mixing machine to form an isostatic pressing ingot after isostatic pressed; The isostatic pressing ingot is sintered in a heating furnace to obtain a sintered ingot; then the sintered ingot is transported into a extruder to extrude into a plate or wire material. The produced silver copper oxide electrical contact material can satisfy the operation requirement of high-performance low-voltage electrical apparatus, thus is applicable to a DC contactor especially.

The invention discloses a preparation method of a low-density SiO2 aerogel / sponge composite material. The preparation method is characterized by comprising the following steps: (a) mixing a silicon source, absolute ethyl alcohol, deionized water and formamide according to the molar ratio of 1:(10-20):(2-7):(1-3), and then adding an acid catalyst of which the molar ratio to the silicon source is (0.001-0.01):1; adding alkali liquor to adjust the pH value after fully stirring and hydrolyzing at 0-60 DEG C; (b) taking a mixed solution in the step (a) into a mold containing sponge, standing to obtain wet gel; (c) replacing a solvent of the wet gel for 3-8 times by adopting absolute ethyl alcohol, wherein each replacement time is 8-24 hours, and carrying out supercritical drying under the environment of CO2 after replacement is finished, so as to prepare the low-density SiO2 aerogel / sponge composite material.