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

Hydrothermal synthesis method for lithium ferromanganese phosphate anode material of lithium ion battery

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.
Owner:朱鸥鹭

Preparation method of echinoid titanium dioxide microspheres in single/double layer cavity structure

The invention relates to a preparation method of echinoid titanium dioxide microspheres in single/double layer cavity structure, belonging to the field of nano composite materials. The method comprises the following steps: (1) preparing monodisperse silicon dioxide microspheres with uniform particle size; (2) by using silicon dioxide as a template, coating a titanium dioxide layer on the surface of the silicon dioxide microspheres by using a sol-gel method to obtain core-shell type silicon dioxide/titanium dioxide composite microspheres; (3) regulating the concentration of sodium hydroxide solution, the hydrothermal reaction time and other conditions, and preparing echinoid titanium-base microspheres in the single/double layer cavity structure in a controllable way; and (4) treating the echinoid titanium-base microspheres in the single/double layer cavity structure with hydrochloric acid with a certain concentration, and calcining at high temperature to obtain anatase-type echinoid titanium dioxide microspheres in the single/double layer cavity structure. The material prepared by the method has the high-activity pure-phase titanium dioxide crystal structure, and has the advantages of large specific area, complete appearance and high yield; the technical process is controllable and easy to operate; and the invention also has the advantages of low preparation cost, no pollution and low energy consumption.
Owner:UNIV OF SCI & TECH BEIJING

Silver zinc oxide electric contact material and preparation method thereof

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.
Owner:YANGZHOU LEYIN ALLOY TECH

Lightweight inorganic insulation board containing silica aerogel and preparation method thereof

The invention discloses a lightweight inorganic insulation board containing silica aerogel and a preparation method thereof. The preparation method comprises the following steps: a. preparing surfactant liquid: fully stirring a surfactant and water to prepare a uniform surfactant liquid for standby use; b. preparing powder: fully mixing cement, ash calcium, aerogel, light aggregate fillers, fibers and latex powder and stirring uniformly to prepare powder for standby use; c. preparing the inorganic insulation board: adding the uniformly mixed powder to the surfactant liquid within 5-10 minutes through stirring, then filling the slurry into a die for forming and curing at normal temperature, thus obtaining the final product. Compared with the traditional inorganic insulation boards and insulation boards containing non-silica aerogel, the prepared inorganic insulation board containing silica aerogel has the characteristics of short production cycle, simple and controllable process and low price, has good heat insulation property and effectively solves the problems of high heat conductivity coefficients and higher water absorption of conventional inorganic insulation boards, and the heat conductivity coefficient of the inorganic insulation board can be reduced by 10-30%.
Owner:BEIJING BUILDING MATERIALS ACADEMY OF SCI RES

Preparation method of silicon-based/graphene composite

ActiveCN103094573AEvenly distributedDoes not pose a health and safety riskCell electrodesLithium-ion batteryElectric field
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.
Owner:DONGGUAN AMPEREX TECH

Method for preparing silver tin oxide material

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.
Owner:ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD

Preparation method of lithium ion phosphate used as positive electrode active material

The invention provides a preparation method of lithium ion phosphate, which is used as a positive electrode active material. The preparation method comprises the steps that: a. a phosphorus source, an iron source and an organic monomer solution are mixed under a controlled pH value of 4 to 6, such that a phosphate precursor is prepared; b. the phosphate precursor obtained from the step a is mixed with a lithium source, and the mixture is subject to a ball milling process; c. the resulting material obtained from the step b is baked under an inert atmosphere. The organic monomer is one or more selected from aniline, thiophene or pyrrole. The prepared lithium ion phosphate positive electrode active material is nano-sized, and has well-distributed particle sizes. The lithium ion phosphate particles can be uniformly coated with carbon with a thickness of a few nanometers, such that the conductivity of the material can be improved. With the material provided by the present invention, the electrode polarization degrees of the batteries during high rate charging/discharging are reduced, the reversible capacities of the batteries are improved, and the cycle lives of the batteries are prolonged. Also, the method provided by the present invention has advantages of low cost, high yield, stable product performance, and simple and controllable processes. With the method, large-scale clean industrial production of the material can be realized.
Owner:BYD CO LTD

Polymer multilayer optical film with linear trapezoidal thickness structure and manufacturing method thereof

The invention discloses a polymer multiplayer optical film with a linear trapezoidal thickness structure and a manufacturing method thereof. The polymer multilayer optical film comprises n first optical film layers and m second optical film layers, wherein the first optical film layers are made of a polymer A; the second optical film layers are made of a polymer B; the polymer A and the polymer B have different refractive indexes; the n first optical film layers and the m second optical film layers are laminated alternately layer by layer; the thicknesses of the n first optical film layers increase layer by layer in a linear gradient way along an overlapping direction; the thicknesses of the m second optical film layers increase layer by layer in a linear gradient way along an overlapping direction; the polymer multilayer optical film is obtained by adopting a bidirectional extension technology. By adopting the polymer multilayer optical film with the linear trapezoidal thickness structure, bandwidth reflection can be performed selectively; for example, infrared light of a certain bandwidth is reflected, ultraviolet light is reflected fully, and visible light is reflected fully. The polymer multilayer optical film is simple in manufacturing process, is low in cost, and can be widely applied in the fields of agricultural plastic tents, automobile window films, building window films and liquid crystal display brightening films.
Owner:安徽昂科丰光电科技有限公司
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