34results about How to "In situ synthesis" patented technology

The invention discloses an in-situ synthesis method of fast ion conductor inlaid lithium ion battery cathode material. Nickel salt, cobalt salt, M salt (M is one of Mn or Al) and a surface active agent are added into a solvent, and precursor powder is prepared through a spray drying method. Precursor is subjected to presintering, so that spherical porous nickel / cobalt / M-based precursor is obtained. Appropriate lithium salt, an organic sequestering agent, a solvent and a fast ion conductor material are mixed through a sol-gel heat treating method, so as to obtain sol, and then the spherical porous precursor is spread in the sol till the solvent is evaporated to form gel, and the fast ion conductor inlaid composite cathode material is synthesized through heat treatment. The method abandons the thinking that the cathode material is firstly prepared and then surface modification is performed in the traditional technology, and realizes the in-situ growth of inlaid composite material. The surface layer of the inlaid composite material adopts a uniformly coated fast ion conductor thin layer, the inner core adopts fast ion conductor doped cathode material, and the inlaid composite material has the advantages of excellent electrochemical property, good safety and storage performance and the like.

The invention relates to a method for preparing Ni@C or Co@C core-shell nanoparticles. The method comprises the steps: (1) adding nickel chloride or cobalt chloride into an isopropanol aqueous solution, adding nitrilotriacetic acid, and stirring for 1 hour at room temperature, so as to obtain a mixed solution; (2) transferring the mixed solution to a reactor, placing the reactor into an air-blasting drying oven, carrying out heat preservation for 6 hours at the temperature of 180 DEG C, cooling, then, separating a product, cleaning and drying in vacuum, so as to obtain a precursor; (3) putting the precursor into a tubular furnace, heating to the temperature of 500-600 DEG C at the heating rate of 2 DEG C / min, and carrying out heat preservation for 2 hours, thereby obtaining a black product, namely the Ni@C or Co@C core-shell nanoparticles. The method has the advantages that the method is simple in process, low in energy consumption, low in cost and free from environmental pollution, and the in-situ synthesis of the Ni@C or Co@C core-shell nanoparticles is realized; the prepared core-shell nanoparticles have porous structures and are larger in specific surface area and narrower in pore size distribution, thereby being a promising catalyst or energy storage material.

The invention discloses a nanometer FeF3 / C composite positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps: (1) putting reaction raw materials into a reaction kettle, filling the reaction kettle with protective gas, and sealing; wherein the reaction raw materials comprise an iron source and polytetrafluoroethylene; and (2) carrying out heat treatment on the sealed reaction kettle at the temperature of more than or equal to 400 DEG C to obtain the nano FeF3 / C composite positive electrode material. According to the invention, the property of sublimation of polytetrafluoroethylene at low temperature is utilized, and an iron source and a fluorine source are fully reacted by using a closed reaction kettle; the used polytetrafluoroethylene can provide a fluorine source and can be cracked to obtain the iron trifluoride composite positive electrode material with superfine nano-particles at the same time. The lithium ion battery positive electrode material provided by the invention has the advantages of high reversible specific capacity, excellent rate capability and good cycling stability.

The invention discloses a natural gas hydrate cave well completion evaluating and testing device which comprises a reaction still system, a cave well completion system, a confining pressure control system, an inlet pressure control system, an outlet pressure control system, a gas-liquid-solid separating system, a temperature control system and a data collecting and processing system. The reactionstill system is used for simulating in-situ generation, cave well completion and extraction of natural gas hydrate; the temperature control system provides a constant temperature environment for the device; the cave well completion system, the confining pressure control system, the inlet pressure control system, the outlet pressure control system and the gas-liquid-solid separating system are usedfor controlling the pressure and flowing state of the experiment process; and the data collecting and processing system is used for collecting and processing the parameters of the experiment process.The invention further relates to a natural gas hydrate cave well completion evaluating and testing method. According to the natural gas hydrate cave well completion evaluating and testing device andmethod, cave well completion testing can be carried out on a hydrate-containing rock core synthesized artificially, and the device and method are used for evaluating the cave well completion conditionof the hydrate.

The invention discloses a method for directly synthesizing titanium dioxide nanoparticles on a fabric fiber in situ, belongs to the technical field of application of titanium dioxide nanoparticles, and aims to solve the problems that TiO2 is liable to agglomeration, liable to lose, hard to recycle and low in sunshine utilization rate in photocatalysis. The method comprises the following steps: firstly, preparing a butyl titanate solution from absolute ethyl alcohol and butyl titanate, and soaking a pure cotton fabric into the butyl titanate solution for 24 hours; hydrolyzing for 0.5 hour, further transferring into a polytetrafluoroethylene high-pressure kettle, and carrying out hydrothermal treatment for 8 hours at 120-150 DEG C; finally respectively calcining for 1 hour in a muffle furnace at 200-400 DEG C, so as to obtain a TiO2 nanoparticle supported fabric. By adopting the method, nano TiO2 can be conveniently recycled and reused, the problems that conventional TiO2 powder is liable to agglomeration and liable to lose and thus low in photocatalysis activity can be avoided, and organic pollutants in sewage can be effectively degraded.

The invention discloses a polyolefin alloy material and a preparation method thereof, belongs to the field of polyolefin materials and particularly relates to a polyolefin / polyisoprene alloy material as well as a preparation method and application thereof. In a polyolefin / polyisoprene alloy, the mass content of polyolefin is 5 to 99.4 percent, and the isotacticity is greater than 85 weight percent; the mass content of polyisoprene is 0.5 to 85 percent; the mole content of a trans-1,4 structure is greater than 85 percent, and the mass content of a block copolymer is 0.1 to 10 percent. The polyolefin / polyisoprene alloy material synthesized by adopting supported titanium and / or a vanadium catalyst through a two-segment polymerization method, disclosed by the invention, is a granular product with a core-shell structure, has the characteristics of high strength and high toughness, and is a novel polyolefin material.

A testing device for testing adhesion force includes a thermal insulated glove box, an atomic force microscope, a cryogenic sample stage, a high pressure gas source and a circulating chiller. The atomic force microscope includes a probe for adhering mineral particles. The cryogenic sample stage is configured for preparing gas hydrate sample. The cryogenic sample stage is arranged below the probe. The atomic force microscope and the cryogenic sample stage are placed in the thermal insulated glove box. The high pressure gas source provides pressure required for synthesis of gas hydrates, the high pressure gas source comprises a high pressure chamber covered on the cryogenic sample stage and a high pressure gas cylinder connected with the high pressure chamber. The circulating chiller, an outlet of the circulating chiller is connected with the thermal insulated glove box to control humidity and temperature inside the thermal insulated glove box.

The invention relates to a processing device for synthesizing a surface layer of a nano-composite material in situ by performing friction stir processing (FSP) on a metal workpiece through a stirring head capable of synchronously feeding powder, and a method. A clamping part 1, a shaft shoulder 2 and a stirring probe 3 of the stirring head can be a rigid whole body or a fastening coaxial separated body; a powder feeding channel A is arranged in the stirring head; the inlet of the channel A is positioned on the side or middle axial position of the clamping part 1; and the outlet of the channel A is positioned on the surface of the middle axial position of the probe 3, which is contacted with the workpiece. During processing, a hydraulic device in a worktable capable of automatically lifting is used for pressurizing along the axial direction B of the stirring head, a rotating shaft drives the stirring head to rotate at high speed and press the workpiece, an external automatic powder feeder feeds sub-micron reinforcing phase powder into a seriously plasticized area C on the surface layer of the workpiece through the powder feeding channel A of the stirring head, and the nano-composite material is synthesized in situ through friction heat. The device is simple, is convenient to operate, is suitable for the composition and structure refining of various metal substrates, and is high in technical and economic benefit and industrial application potential.

The invention discloses biomedical material and a preparation method thereof. The preparation method includes: 1, melting and forming; 2, polarizing an anode; 3, depositing the anode; 4, performing thermal treatment; 5, coating. The biomedical material comprises a pure magnesium or magnesium-alloy base and a functional film which covers the surface of the base and which has the functions of degradation protection and self-degradation. The biomedical material features controllability, full degradation and full absorption, and the strict requirements for ideal features of the degradable biomaterial are met. The biomedical material has the advantages that an optimal solution is provided for the absorbable biomedical material, especially the contradiction between biodegradability and degrading speed control in medical magnesium alloy, and related materials and techniques are applicable to common medical instruments and are more competitive in production of high-end medical instruments, such as implant instruments, especially 'secondary-operation-free' implants.

The invention relates to a microcubic composite material with a hierarchical structure, an electrode sheet, a sodium ion battery and a preparation method thereof. The preparation method firstly prepares a precursor FeFe(CN)6 by a simple heat-assisted method, and in a later selenization process, the iron atoms in the precursor are converted in-situ to FeSe2, and at the same time, packaging by a carbon skeleton converted simultaneously by an organic framework is carried out. The compound prepared by the method is prepared to an electrode as the negative electrode of a sodium ion battery, and through testing, electrochemical characteristics such as high specific capacity, long cycle life, and excellent rate performance are presented, and the preparation method has the series of advantages such as a simple process, low energy consumption, and low cost, and therefore has broad application prospects.

A needle-shaped nano-silver / nitrogen-doped graphene composite material and a preparation method thereof belong to the technical field of nano-materials. The composite material, according to the mass ratio, graphene oxide: nitrogen source: morphology control agent: silver salt = 1: (0.05-20): (0.001-100): (0.01-10). Preparation method: 1. Prepare graphene oxide dispersion; 2. Add nitrogen source and morphology control agent to graphene oxide dispersion to prepare mixed solution; 3. Prepare silver salt solution; 4. Combine mixed solution and silver salt solution After mixing, transfer it to a hydrothermal reaction kettle, react at 100-220°C for 2-24 hours, and obtain a crude composite material; 5. Centrifuge, wash, and dry the crude composite material to obtain acicular nano-silver / nitrogen-doped graphene composite material . The method simultaneously realizes the nitrogen doping of graphene and the in-situ synthesis of needle-shaped nano-silver particles on the surface of the nitrogen-doped graphene, and the method is simple and easy to implement.

The invention relates to a preparation method of a tough and wear-resistant silicon nitride-based composite ceramic, comprising the following steps: (1) by mass percentage, adding 80 to 95% of α-Si 3 N 4 powder and 5~20% C 4 h 6 CoO 4 • 4H 2 After the O aqueous solution is mixed, it is magnetically stirred under heating conditions until the solvent is completely evaporated to dryness to obtain a mixed powder; (2) the mixed powder is crushed through a 100-mesh sieve and put into a steel mold for pre-pressing to obtain a pre-pressed sample; (3) The pre-pressed sample is sintered at high temperature and high pressure, and then cooled with the furnace to obtain a blank; (4) After the blank is subjected to surface polishing treatment, a silicon nitride-based composite ceramic is obtained. The process of the invention is simple and controllable, the production efficiency is high, the powder does not need special treatment, and is suitable for mass production. The prepared finished product has excellent high-temperature toughness and anti-wear performance, and greatly prolongs the service life of ceramic parts in a high-temperature environment.

The invention discloses a polyolefin alloy material and a preparation method thereof, belongs to the field of polyolefin materials and particularly relates to a polyolefin / polyisoprene alloy material as well as a preparation method and application thereof. In a polyolefin / polyisoprene alloy, the mass content of polyolefin is 5 to 99.4 percent, and the isotacticity is greater than 85 weight percent; the mass content of polyisoprene is 0.5 to 85 percent; the mole content of a trans-1,4 structure is greater than 85 percent, and the mass content of a block copolymer is 0.1 to 10 percent. The polyolefin / polyisoprene alloy material synthesized by adopting supported titanium and / or a vanadium catalyst through a two-segment polymerization method, disclosed by the invention, is a granular product with a core-shell structure, has the characteristics of high strength and high toughness, and is a novel polyolefin material.

The invention discloses a high isotactic polypropylene alloy and a preparation method thereof. In the high isotactic polypropylene alloy of the invention, the mass content of isotactic polypropylene is 60% to 98%, and the mass content of polyolefin copolymerized elastomer is 1 % to 35%, and the mass content of random polypropylene is 1% to 5%. High isotactic polypropylene alloys are prepared by a two-step process: the first step uses Ziegler‑Natta catalyst to catalyze propylene slurry or gas phase or liquid phase bulk polymerization to prepare high isotactic polypropylene, and the second step continues to carry out butene and Gas phase copolymerization of other higher olefins to prepare high isotactic polypropylene alloys.

The invention discloses a natural gas hydrate cave completion evaluation and testing device, comprising a reactor system, a cave completion system, a confining pressure control system, an inlet pressure control system, an outlet pressure control system, a gas-liquid-solid separation system, and a temperature control system and data acquisition and processing system; the reactor system is used to simulate the in-situ generation of natural gas hydrate, cave completion and exploitation; the temperature control system provides a constant temperature environment for the device; cave completion system, confining pressure control system, and inlet pressure control system , the outlet pressure control system and the gas-liquid-solid separation system are used to control the pressure and flow state of the experimental process; the data acquisition and processing system is used to collect and process the parameters of the experimental process. The invention also relates to a natural gas hydrate cave completion evaluation and testing method. The invention can carry out cave completion test on artificially synthesized hydrate-containing cores to evaluate the completion conditions of hydrate caves.

A disclosed method for in-situ synthesizing a silicate / carbon composite cathode material by taking rice husk carbon as a silicon source comprises the following preparation steps: (1) primary smashing of rice husks; (2) purification of the rice husks; (3) pyrolyzing the rice husks under catalysis of metal elements to obtain a SiMO / C mixture; (4) smashing the SiMO / C mixture to D50=1-2 [mu]m by an jet mill; (5) adding a lithium source, ball milling and mixing; and (6) sintering under gas protection to obtain Li2MSiO4 / C. According to the method, cheap biological silica is used to prepare the silicate cathode material, resource utilization of agriculture wastes is realized, and high added-value products are produced; at the same time, the rice husk carbon is obtained by the middle-temperature pyrolysis method, the residual carbon of the rice husk carbon is taken as a carbon source, and the synthesis process of the silicate cathode material does not need extra carbon, and the in-situ synthesis of the Li2MSiO4 material is realized synchronously.

The invention discloses a nano FeF3 / C composite positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps: (1) putting reaction raw materials into a reaction kettle, filling the reaction kettle with protective gas, and sealing, wherein the reaction raw materials comprise an iron source and polytetrafluoroethylene; and (2) carrying out heat treatment on the sealed reaction kettle at the temperature of more than or equal to 400 DEG C to obtain the nano FeF3 / C composite positive electrode material, wherein the iron source is selected from ferrocene and / or ferric trichloride. According to the invention, the property of sublimation of polytetrafluoroethylene at a low temperature is utilized, and a specific type of iron source and fluorine source are fully reacted by using a closed reaction kettle; and the used polytetrafluoroethylene can provide a fluorine source and can be cracked to obtain the iron trifluoride composite positive electrode material with superfine nano-particles at the same time. The lithium ion battery positive electrode material provided by the invention has the advantages of high reversible specific capacity, excellent rate capability and good cycling stability.

The invention discloses a method for preparing a porous silicon-carbon composite material in situ; the method comprises the following steps that (1) a polymer with positive charges is mixed with a solvent to obtain a mixed solution, wherein the main chain or the side group of the polymer with positive charges has an amino group; and the solvent is a mixed solvent composed of an organic solvent andwater; (2) a silicon source is mixed with the mixed solvent obtained in the step (1), the mixture is subjected to hydrolysis reaction to obtain a suspension, and then the suspension is subjected to post-treatment A to obtain a silicon-carbon precursor; and (3) the silicon-carbon precursor is mixed with magnesium powder, magnesium thermal reduction reaction is carried out to obtain a crude product, and post-treatment B is performed to obtain the porous silicon-carbon composite material. The invention discloses the method for preparing the porous silicon-carbon composite material in situ; the prepared porous silicon-carbon composite material is complete in morphology, the particle sizes of the composite material are relatively small, and the particle sizes of the composite material are about 20-60 nm. By taking the porous silicon-carbon composite material as a negative electrode, the cycling stability of the lithium battery can be remarkably improved.