21results about "Carbon fluorides" patented technology

The invention discloses a preparation method and application of a Ni-NH2-MOF-coated HPP-COF composite material for adsorbing and separating perfluorocarbon gas / nitrogen, and belongs to the field of gas separation. The method comprises the following steps: 1, preparing HPP-COF powder; 2, preparing Ni-NH2-MOF (Metal Organic Framework) powder; and 3, compounding. According to the invention, Ni-NH2-MOF and HPP-COF are introduced into the field of gas adsorption, and a method for combining COF and MOF materials is creatively provided by utilizing the interaction of specific recognition of a perfluorinated compound and an amino group and a polymerization reinforcing structure on the surface of HPP-COF; a PFCs / N2 mixed gas separator meeting actual production requirements is prepared, the high adsorption capacity of MOF and the high stability of COF are combined, the problems that a traditional static porous material is poor in selectivity, stability and acid resistance are solved, specific adsorption of MOF to PFCs is enhanced, and selectivity is improved.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a metal borohydride composite material, a preparation method thereof and a hydrogen storage material. The preparation method comprises the following steps: activating the carbon-based carrier by adopting an alkaline substance; performing gas-phase fluorination treatment on the activated carbon-based carrier; the carbon fluoride-based carrier is mixed with a metal source, a boron source and a solvent, a solvothermal reaction is driven by hydrogen, metal borohydride is synthesized in situ on the surface of the carbon fluoride-based carrier, metal atoms in the generated metal borohydride react with F atoms in the carbon fluoride-based carrier to form a metal-F bridging phase, and meanwhile, the metal borohydride generates metal vacancies. The metal affinity of fluorine in the carbon fluoride-based carrier is utilized to induce nucleation loading of the metal borohydride in the synthesis process of the metal borohydride, and meanwhile, an interface chemical reaction is carried out to generate vacancies and bridging phases. Vacancies weaken B-H bonds, the hydrogen absorption and desorption heat / dynamics of the material are improved, and the bridging phase improves the structural stability and hydrogen absorption and desorption cycle performance of the material.

The invention discloses a vertical graphene skeleton confinement silicon fluoride-based composite material as well as a preparation method and application thereof, and belongs to the field of inorganic materials. Putting Si into a tubular furnace, and heating to 1000-1200 DEG C at the speed of 10 DEG C / min in an argon environment; converting the atmosphere into a hydrogen / methane mixture for reaction to generate Si (at) G; then mixing and grinding the Si (at) G and tetrafluoroterephthalic acid, transferring the mixture to a tubular furnace, and finally performing heat treatment in an argon atmosphere to obtain a Si (at) G-F composite material; the composite material is of a core-shell type compact structure, and the surfaces of silicon particles are coated with vertically growing graphene sheets (VGs) in a self-adaptive mode to form a tightly-crosslinked three-dimensional network; dispersed sphere-like particles are formed, and the surfaces of the particles are tightly coated with the corrugated graphene sheet layers; the vertical graphene framework confinement silicon fluoride-based composite material Si (at) G-F composite material disclosed by the invention shows excellent electrochemical performance, and a feasible new way is provided for the development of high-energy-density lithium ion batteries.

The present invention discloses a method for preparing a silicon-carbon composite material by plasma modification, the silicon-carbon composite material and its applications. It includes at least the following steps: Step S10) putting aminated porous carbon into a deposition chamber, passing silane gas through the deposition chamber to deposit nanosilicon on the aminated porous carbon to obtain a silicon-carbon precursor material; Step S20) transferring the silicon-carbon precursor material to a chamber for plasma modification, passing a halogen gas in the form of plasma, and depositing the generated halogen ions on the surface of the silicon-carbon precursor material to obtain a silicon-carbon precursor material coated with halogenated carbon; Step S30) stopping the passage of the halogen gas and passing a carbon source gas in the form of plasma. The prepared silicon-carbon composite material forms a structurally stable core-shell structure, greatly reduces the expansion problem of silicon, and can significantly improve the cycle performance of a battery applied therewith. In addition, the process of this application is simple, and by using the plasma method to modify the silicon-carbon material, it is easy to achieve mass preparation and large-scale industrialization.

The invention relates to a preparation method of a high-power pulse type composite positive electrode material and a battery, and the core of the composite positive electrode material is as follows: activating a carbon fluoride nanotube, introducing the carbon fluoride nanotube into a silver salt solution, sequentially adding a reducing agent for gradient chemical plating, and finally loading nano-silver particles on the surface of the carbon fluoride nanotube to obtain the high-power pulse type composite positive electrode material. Meanwhile, the reductive defluorination effect is triggered in the growth process of the nano-silver, the carbon defect configuration in the fluorinated carbon nanotube is optimized, and the wettability of the material to an electrolyte is improved; the construction of an in-situ high-conductivity silver-carbon three-dimensional network and the reconstruction of an intrinsic structure are realized in one step, and the obtained composite material can meet the extreme requirements of ultrahigh-power pulse discharge on instantaneous electron conduction, rapid ion migration and low impedance at the same time. Severe polarization and impedance surge under large pulse current can be fundamentally inhibited, and the ultrahigh-rate pulse discharge capability which cannot be achieved by a traditional lithium / carbon fluoride battery is realized.

The application discloses a kind of sulfur selenium co-doped carbon fluoride materials, preparation method and application thereof, belong to carbon fluoride material field, a kind of sulfur selenium co-doped carbon fluoride material, including carbon fluoride, carbon fluoride surface doped with sulfur selenium compound, the mass fraction of sulfur selenium compound is 9.99%-30%.The sulfur selenium co-doped carbon fluoride material of the application, preparation method and application thereof synthesize a kind of sulfur selenium co-doped carbon fluoride material by simple heating treatment, can improve the discharge voltage and rate capability of carbon fluoride material under large rate.

The application discloses carbon fluoride directly using calcium fluoride as raw material and a preparation method and application thereof. The method mainly comprises the following steps: mixing a certain mass of calcium fluoride and hydrogen phosphate of alkali metal for 1h-48h, then adding a certain mass of carbon powder and continuing to mix for 1h-48h; placing the mixture into a fixed bed reactor, vacuumizing to 0.005-0.1kPa, and then introducing inert gas, and keeping the pressure of the reaction system to be 10kPa-95kPa; after heating to 200-1000 DEG C, the reaction is carried out for 2-48h, and then the reaction is stopped; the obtained product is soaked in sulfuric acid, cleaned with deionized water until neutral, and dried to obtain carbon fluoride material. The method directly uses calcium fluoride for fluorination, does not use hydrogen fluoride and fluorine source using hydrogen fluoride as an intermediate product for fluorination, can reduce energy demand, simplify the process, improve safety, and greatly reduce the production cost of carbon fluoride.

This invention provides a method for producing carbon tetrafluoride using fluoroform as a raw material, and a pyrolysis and purification apparatus, which relate to the technical field of fluoroform resource utilization. Fluoroform is injected into a thermal plasma reactor and subjected to a pyrolysis reaction at 1500-5000 K to obtain carbon tetrafluoride. Compared to conventional tubular furnace pyrolysis or high-temperature muffle furnace pyrolysis, the thermal plasma reactor used in this invention relies on the synergistic effect of highly active electrons and heavy particles at high temperatures, resulting in significant electron excitation. This allows for efficient cleavage and directional reorganization of chemical bonds in fluoroform molecules without the use of catalysts or fluorine gas, resulting in high fluoroform conversion, high carbon tetrafluoride selectivity, and low energy consumption. Furthermore, the method provided by this invention has a short reaction time, large throughput, is safe and controllable, and the pyrolysis reaction products have a simple composition and are easy to separate and purify. It also consumes low cost and energy, making it suitable for industrial continuous scale-up production.

The application discloses a fluorinated carbon material and a preparation method and application thereof, and the method comprises the following steps: (1) putting a carbide into a fixed bed reactor, and vacuumizing to 0.005-0.1 kPa; the carbide is SiC; (2) after heating to 200-600 DEG C, inert gas is introduced, the pressure of the reaction system is kept to 10 kPa-95 kPa, then inert gas containing fluorinated reagent is continuously introduced, and reaction is carried out at 200-600 DEG C for 4-96 hours; the fluorinated reagent is a mixed gas of hydrogen fluoride and gas phase fluorinated substance; (3) the product obtained in the step (2) is soaked with an alkali solution, cleaned with deionized water until neutral, and dried to obtain the fluorinated carbon material. The preparation method can make the uniform distribution of fluorocarbon bonds in the fluorinated carbon material, and further improve the specific capacity of the fluorinated carbon material.

This invention proposes a three-dimensional Li-type nanodiamond with fluorinated carbon as the substrate and nanodiamond as the binding site. 1.5 Na 1.5 V2(PO4)3 / NDs / CF x This invention relates to a cathode material and its preparation method, belonging to the technical field of cathode materials for lithium-ion batteries. The cathode material obtained by this invention exhibits good cycle stability when applied to the cathode of a lithium-ion battery. At 50 mA g... ‑1 The specific capacitance after 200 cycles at current density is 162 mA hg ‑1 ; at 1000mA g ‑1 At high current densities, it still achieves a significant 96 mA hg after 1000 cycles. ‑1 It exhibits long-term cycling stability and high capacity performance. The preparation method used in this invention has the advantages of simple process, easy implementation, and easy scale-up, and is expected to be mass-produced in the future.

The application belongs to the technical field of primary batteries, and particularly relates to high-discharge-voltage fluorocarbon and a preparation method and application thereof. The application provides a preparation method of high-discharge-voltage fluorocarbon, which comprises the following steps: fluorination of amorphous carbon in a fluorine-containing atmosphere to obtain the high-discharge-voltage fluorocarbon; the amorphous carbon has a hierarchical pore structure; the specific surface area of the amorphous carbon is not less than 1000 m 2 / g; and the fluorination temperature is 20-200 DEG C. The application reduces the fluorination temperature by screening carbon raw materials, adopts a low-temperature fluorination treatment process, maximally retains the conductive network structure of the starting carbon source and improves the electrochemical activity of fluorocarbon bonds, the porous network structure of the carbon raw material is also beneficial to the shuttling of internal charges of the battery, and finally the preparation of high-voltage fluorocarbon material is realized.

Provided are a carbon fluoride modification method, modified carbon fluoride and a lithium / carbon fluoride battery. The modification method comprises: mixing carbon fluoride with a composite solvent, subjecting same to a modification treatment, and then performing solid-liquid separation, so as to obtain modified carbon fluoride, wherein the composite solvent comprises water and an ether solvent. The composite solvent is used to modify carbon fluoride; and under the synergistic effect of water and the ether solvent, unstable components in a carbon fluoride material can be removed by means of reaction, thereby improving the chemical stability of the carbon fluoride material and reducing side reactions of carbon fluoride with an electrolyte solution, and therefore the storage stability of a lithium / carbon fluoride battery is improved. The modification method is simple and feasible, does not need the step of pre-charging, and is easy to implement and suitable for large-scale production.

This invention relates to the technical field of gas purification, and particularly to a carbon tetrafluoride purification system and method. The purification system includes a precooling unit, a low-boiling-point column, and a high-boiling-point column. Both the low-boiling-point and high-boiling-point columns have arrayed packing layers inside, with distribution plates between the packing layers. The distribution plates have arrayed telescopic mass transfer sections. The tops of the low-boiling-point and high-boiling-point columns are respectively equipped with low-boiling-point condensers and high-boiling-point condensers. After condensation, the refrigerant from both columns is introduced into the telescopic mass transfer section through an inlet pipe and then discharged through an outlet pipe. A booster fan is installed on the inlet pipe, and a regulating valve is installed on the outlet pipe. This invention uses a flow meter to detect the gas discharge and liquid reflux rates of the distillation column, and calculates the reflux ratio change accordingly. By adjusting the operating power of the booster fan and the opening size of the regulating valve, the amount of refrigerant introduced into the telescopic mass transfer section can be controlled, thereby adjusting the height of the top of the telescopic mass transfer section.

The application discloses a kind of carbon fluoride material and its preparation method and application, belong to lithium / carbon fluoride battery technical field.The application is by carbon material into fixed bed reactor, after vacuumizing, heated to 200~1000 DEG C, inert gas is passed into, after keeping the pressure of reaction system stable, then inert gas containing halogenated reagent is passed into and carries out halogenation reaction, obtains halogenated carbon, continuously passes into inert gas containing fluorinated reagent, under 100~1000 DEG C, the product obtained is soaked by lye, deionized water is cleaned, after drying, obtains carbon fluoride material.The application is first by halogenation reaction, so that halogen atom is located between carbon layer, interval is larger, is conducive to the fluorination reaction of subsequent, also makes the heterogeneity of each place of carbon reduce, avoids invalid structure caused by excessive fluorination of edge carbon, and the specific capacity of prepared carbon fluoride is higher, and the wider interval of carbon material can make electrolyte fully infiltrate, guarantees the power characteristics of battery.

The invention provides a preparation method of carbon nanotube-based aerogel. The preparation method comprises the following steps: preparing a mixed precursor solution of carbon nanotubes and fluorinated graphene; a cylindrical container metal mold is constructed, and a top cover is arranged; filling a metal mold with the mixed precursor solution until the metal mold is in a saturated state, covering a top cover, completely putting the filled mold into liquid nitrogen for directional freezing, taking out the frozen mold, removing the top cover, and putting the mold into a freeze dryer for freeze drying to obtain aerogel; putting the prepared aerogel into a tubular furnace, and carrying out heat treatment in a nitrogen or argon atmosphere; and the aerogel subjected to heat treatment is put into a small plasma cleaning machine to be subjected to Plasma treatment. The aerogel prepared by the method provided by the invention has a larger thermal conductivity regulation range, and is applied to thermal management of batteries under various complex working conditions.

The application discloses fluorocarbon doped modified lithium ion battery ternary positive electrode material and a preparation method and a battery thereof. 0.838 Co 0.114 Mn 0.048 (OH)2 and LiOH·H2O are mixed and ground, sintering is carried out to obtain high-nickel positive electrode material NCM; the high-nickel positive electrode material is mixed with polyvinylidene fluoride and then is dissolved in anhydrous ethanol, water bath heating and stirring are carried out to obtain a gel-like material; the gel-like material is vacuum dried, is ground to obtain a solid powder, and then is subjected to second sintering in an inert gas atmosphere to obtain the fluorocarbon doped modified lithium ion battery ternary positive electrode material. The application adopts a double-modification method of doping and coating, and uses a high-temperature solid phase method to prepare the fluorocarbon doped modified ternary positive electrode material; under high cut-off voltage, F doping can form TM-F bonds with higher bond energy, has the advantages of improving the cycle performance and rate performance of the NCM material, and improves the structural stability and electrochemical performance of the high-nickel positive electrode material.

The application discloses a high-purity electronic special gas storage and separation method, and belongs to the technical field of chemical adsorption. 2+ The adsorption medium is an ordered three-dimensional microporous metal organic framework material formed by coordination of Co 2+ , Zn 2+ or Fe 2+ and 1,5-dihydrobenzo[1,2-d:4,5-d']bis([1,2,3]triazole) or 1,7-dihydrodibenzo[b,e][1,4]dioxin[2,3-d:7,8-d']bis([1,2,3]triazole). The application can realize efficient storage and separation and purification of electronic special gases such as SF6, NF3, C3F6, CF4, BF3, C2F6, C3F8, CHF3, CF3I, C2F5I, SiH4, Si2H6, AsH3, GeF4, BCl3, WF6, AsF3 and ClF3, and can realize regulation of pore size and change of pore chemical environment through metal ion exchange and metal cluster coordination functional group modulation, so that specific electronic special gas guest molecules can be accurately identified, and efficient storage and separation and preparation of high-purity electronic special gases can be realized.

The present invention discloses a plasma modification preparation method of a silicon-carbon composite material, and a silicon-carbon composite material and a use thereof. The preparation method includes at least operation steps of: S10). placing aminated porous carbon in a deposition chamber, introducing a silane gas into the deposition chamber, and depositing nano-silicon in the aminated porous carbon, to obtain a silicon-carbon precursor material; S20). transferring the silicon-carbon precursor material to a plasma method modification chamber, introducing a halogen gas in a plasma manner, and depositing generated halide ions on a surface of the silicon-carbon precursor material, to obtain a silicon-carbon precursor material coated with halogenated carbon; and S30). stopping introducing the halogen gas, and introducing a carbon source gas in the plasma manner, to obtain the silicon-carbon composite material. The obtained silicon-carbon composite material has a stable core-shell structure, which can significantly alleviate silicon expansion problems and significantly improve cycle performance of a battery to which the silicon-carbon composite material is applied. In addition, the present application has a simple process, the silicon-carbon material is modified according to a plasma method, and the silicon-carbon composite material is easily prepared in batches and is easily industrialized on a scale.

The application discloses a method for preparing carbon fluoride material by using a microwave, the carbon fluoride material and application, and belongs to the technical field of carbon fluoride material preparation. The method comprises the following steps: placing the carbon material in a reaction boat special for a microwave sintering furnace, sealing the sintering furnace, vacuumizing to 0.005-0.1 kPa, and then introducing inert gas for three times, and keeping the pressure of the reaction system at 10 kPa-95 kPa; setting the microwave sintering furnace to heat to a certain temperature at a temperature increasing rate of 0.2-10 DEG C / min, opening a certain microwave output power, and continuously introducing inert gas containing fluorinated reagent while maintaining constant temperature, and reacting for 4-96 hours; stopping the reaction after cooling; and soaking the obtained product in an alkali solution to remove unreacted fluorine-containing gas, then washing the product with deionized water until neutral, and drying the product to obtain the carbon fluoride material. The preparation method can realize fluorination at a low temperature, the temperature is uniform, the reaction time is short, and the fluorocarbon bond is uniformly distributed in the material. The method is simple, low in cost, and has a good industrialization prospect.

The invention discloses a sulfur-selenium co-doped carbon fluoride material, a preparation method and application thereof, and belongs to the field of carbon fluoride materials, the sulfur-selenium co-doped carbon fluoride material comprises carbon fluoride, the surface of the carbon fluoride is doped with a sulfur-selenium compound, and the mass fraction of the sulfur-selenium compound is 9.99%-30%. According to the sulfur-selenium co-doped carbon fluoride material, the preparation method and the application thereof, the sulfur-selenium co-doped carbon fluoride material is synthesized through simple heating treatment, and the discharge voltage and the rate capability of the carbon fluoride material under high rate can be improved.

This invention discloses a method for preparing and applying a high fluorine-to-carbon ratio fluorinated carbon material, belonging to the field of fluorinated carbon material preparation. The method for preparing a high fluorine-to-carbon ratio fluorinated carbon material includes the following steps: S1: Crush tea stems and filter to separate the tea stem fragments; S2: Stir the dried tea stem fragments with an acid solution at 100℃-130℃ for 2-4 hours, and wash the tea stem fragments until the pH of the aqueous solution is 6-8; S3: Heat the tea stem fragments to 140℃-160℃ under an inert gas atmosphere. The mixture is heated to ℃ and maintained at that temperature for 1.5-2.5 hours, then carbonized at 1100℃-1400℃ for 2-4 hours. After cooling, pyrolytic carbon material is obtained. S4: The pyrolytic carbon material is washed with water until neutral, dried, and ground into powder. S5: The powder is placed in a container and evacuated. Fluorine-containing gas is introduced, maintaining a pressure of 0.3-0.7 MPa, and reacted at 280℃-360℃ for 12-72 hours. After the reaction, the temperature is lowered to room temperature to obtain a high fluorine-to-carbon ratio fluorinated carbon material. This invention uses tea stems as raw material and utilizes a high-pressure, low-temperature fluorination process to obtain a high fluorine-to-carbon ratio fluorinated carbon material with a fluorine-to-carbon ratio ≥1.0.