413 results about "Graphite carbon" patented technology

The invention discloses a whisker carbon nanotube doped sulfonated polyetheretherketone water lubricated bearing material and a preparation method, and belongs to the technical field of high polymer materials, and the preparation method comprises the steps of dispersion of whisker carbon nanotubes, doping of the whisker carbon nanotubes, carbon fibers and graphite, cold press molding, sintering and the like. Hydrophilic sulfonic acid groups and whisker carbon nanotubes with branched structures are introduced into the sulfonated polyether-ether-ketone material, so that the sulfonated polyether-ether-ketone material effectively adsorbs hydrated cations in seawater, a hydrated lubricating layer is formed on the surface of the material, and interfaces of graphite, carbon fibers and polymers doped in the material are bridged and toughened. Besides, the whisker carbon nanotubes are dispersed by means of an alkylbenzene sulfonate dispersant, so that sulfonic acid groups can interact with the whisker carbon nanotube surface dispersant, the binding property of the polyether-ether-ketone material and the whisker carbon nanotubes is enhanced, and the surface strength of the material can be improved. Therefore, the problems that an existing polyether-ether-ketone composite material is poor in bearing capacity and serious in abrasion at a low rotating speed are solved.

The invention relates to the technical field of preparation of heat-conducting epoxy composite materials, in particular to a graphite / carbon fiber felt / epoxy composite material with a three-dimensional heat-conducting network, which is prepared by forming a graphite / carbon fiber felt three-dimensional heat-conducting network by graphite and a carbon fiber surfacing felt and then compounding the graphite / carbon fiber felt three-dimensional heat-conducting network with an epoxy resin matrix. The preparation method disclosed by the invention has the characteristics of simple and convenient process and easiness in operation mastering, and the obtained composite material shows good convenience in the aspect of processing and is relatively low in cost. Experimental results show that the in-plane heat conductivity of the prepared heat-conducting composite material can reach 0.763 W / mK, and compared with a pure epoxy resin matrix, the heat conductivity of the heat-conducting composite material is improved by about 302%, and the heat-conducting composite material shows excellent heat-conducting property.

The invention is suitable for the technical field of flame retardance of high polymer materials, and provides a core-shell structure graphite phase carbon nitride derivative and a preparation method thereof.The derivative is prepared by the steps that a precursor containing phosphorus and boron elements is mixed with melamine, and phosphorus / boron co-doped graphite phase carbon nitride is prepared through a high-temperature thermal polymerization reaction; and then assembling the phytic acid copper on the surface of the graphite-phase carbon nitride in an in-situ growth manner by adopting an aqueous solution self-assembly method to construct a derivative with a core-shell structure. The invention provides the graphite phase carbon nitride derivative with the core-shell structure, which is green, environment-friendly, efficient and flame-retardant and simple and convenient in process, and the preparation method of the graphite phase carbon nitride derivative, and the graphite phase carbon nitride derivative has wide application prospect and industrialization value.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention discloses a method for recovering all components of a waste lithium battery. The method comprises the following steps: finely disassembling the waste lithium battery to obtain a positive plate, a negative plate, a shell and a diaphragm; respectively carrying out electrochemical powder removal on the positive and negative plates by using pulse current to obtain an aluminum foil, positive powder and an electrolytic mother solution I after the powder removal of the positive plate, and obtaining a copper foil, negative powder and an electrolytic mother solution II after the powder removal of the negative plate; lower-layer inorganic components of the electrolytic mother liquor I and the electrolytic mother liquor II are used as electrolytes and are respectively returned to the positive plate and the negative plate for electrochemical powder removal, and upper-layer organic components can be used as organic fluorine raw materials; preferentially extracting lithium from the positive electrode powder to obtain a lithium salt, and extracting nickel, cobalt and manganese to obtain a nickel salt, a cobalt salt and a manganese salt; and purifying and repairing the negative electrode powder to obtain lithium salt and graphite carbon powder. According to the invention, high-efficiency fine separation and recovery of each component of the waste lithium battery can be realized, the recovery rate and purity of positive electrode powder, negative electrode powder, copper foil, aluminum foil and the like are relatively high, and diaphragms and fluorine resources can be completely recovered.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention relates to a preparation method of a modified PVDF-HFP / PEO composite solid electrolyte membrane, which comprises the following steps: doping a spinning solution of PVDF-HFP by using a sulfonated nickel phthalocyanine (at) cobalt-graphite carbon nitride composite material CNC as a filler, preparing a CNC filler doped PVDF-HFP three-dimensional fiber skeleton by using an electrostatic mode process, and preparing a PVDF-HFP / PEO composite solid electrolyte membrane by using the CNC filler doped PVDF-HFP three-dimensional fiber skeleton. The solid-state electrolyte membrane is obtained by compounding the three-dimensional fiber skeleton and a PEO-LiTFSI membrane casting solution, so that the mechanical strength and stability of the solid-state electrolyte membrane (diaphragm) are improved, the volume change in the electrochemical reaction process can be effectively buffered, the lithium dendrite growth resistance of the solid-state electrolyte membrane is improved, and the electrochemical properties such as ionic conductivity are improved.

The invention discloses an aircraft fairing and a fairing body composite material integrated forming process, and relates to the technical field of aviation equipment manufacturing. The forming process comprises the following steps: 1) preparing a prepreg; (2) sectional forming; 3) a curing process; (4) demolding and trimming; 5) an assembly process; the whole of the front section, the middle section and the tail section of the fairing is of a long-size U-shaped streamline structure. According to the invention, through molecular collaborative design of fluorination modification-polysiloxane toughening-cyanate ester interpenetration, the key contradiction of a high-performance fairing material is systematically solved; ultrahigh strength and toughness are realized at the same time by utilizing in-situ nano microphase separation; a dense graphite carbon layer is generated through catalysis, so that efficient halogen-free flame retardance is achieved; by means of the partition design of molecular fluorination and surface metallization, the high wave transmission and lightning protection functions are ingeniously unified. And finally, a new generation of aircraft fairing composite material with force bearing, wave transmission, heat resistance, impact resistance and environmental stability is successfully prepared.

The invention discloses an insulating heat-conducting glass fiber reinforced polyphenylene sulfide composite material and a preparation method thereof. The composite material comprises the following raw material components: 30-50 parts by mass of polyphenylene sulfide, 10-20 parts by mass of glass fiber, 30-50 parts by mass of a heat-conducting filler, 5-10 parts by mass of a compatilizer and 0.3-1 part by mass of a coupling agent, and the heat-conducting filler is selected from one or more of graphite, silicon carbide, aluminum oxide, magnesium oxide, aluminum nitride and hexagonal boron nitride; the compatilizer is selected from a glycidyl methacrylate graft polymer. The polyphenylene sulfide composite material prepared by the preparation method disclosed by the invention has high insulativity, high thermal conductivity and good mechanical properties.

The invention discloses a polymorphic graphite-carbide steel-based multiphase wear-resistant composite material and a preparation method and application thereof.The material is of a composite tissue structure of spheroidal graphite, three-dimensional coralline graphite, multiple carbides and a steel matrix, and the multiple carbides are M3C type carbides and MC type carbides. Comprising the core steps of component design, composite inoculant proportion design, smelting and inoculation treatment, subsequent heat treatment and the like, and is characterized in that synergistic precipitation of spheroidal graphite, three-dimensional coralline graphite and various and multi-size carbides is achieved through chemical component design and inoculation regulation and control; the invention further provides application of the material in high-impact, heavy-load or dry-friction working conditions of crushing or grinding equipment. The material provided by the invention has better comprehensive wear resistance under complex working conditions, has structural stability, impact resistance, lubricity and thermal stability, and has wide engineering application prospects in severe environments such as high impact, high load, dry friction and the like.

The invention discloses a system and a method for co-producing graphite carbon and hydrogen through biomass two-stage pyrolysis, and belongs to the technical field of biomass pyrolysis. The system comprises a low-temperature pyrolysis module and a continuous Joule thermal pyrolysis module. The Joule pyrolysis reactor is designed into a wheel disc type, so that biomass pyrolysis reactions can be linked into a whole, the reactions are continuously carried out, the starting and stopping time of a pyrolysis module is shortened, the economical efficiency of the whole system is improved, and graphite carbon and hydrogen are more efficiently obtained. By utilizing the system, firstly, biomass is subjected to low-temperature pyrolysis and condensation to obtain pyrolytic carbon and bio-oil, then the pyrolytic carbon is subjected to Joule thermal pyrolysis, condensation and purification to obtain graphite carbon, bio-oil and hydrogen-rich synthesis gas, the low-cost biomass is used as a raw material to prepare graphite carbon and hydrogen, and fossil resources used in traditional graphite carbon preparation are saved. The system can be better used for industrial production, and co-production of graphite carbon and hydrogen is achieved.

The invention relates to the technical field of fuel cells, and mainly relates to a graphitized carbon loaded platinum-based catalyst and a preparation method thereof. The preparation method comprises the following steps: carrying out ultra-fast heating treatment on a non-graphitized solid carbon material, and graphitizing to obtain a graphitized solid carbon material; the preparation method comprises the following steps: loading platinum-based nanoparticles on a graphitized solid carbon material by an impregnation method to obtain a graphitized carbon loaded platinum-based catalyst; the condition of the ultrafast heating treatment is that the ultrafast heating treatment is carried out for 0.05-500 seconds at the temperature of 1200-3000 DEG C. The multi-defect graphitized carbon loaded platinum-based catalyst can be prepared by the preparation method, and can be used for the catalytic oxygen reduction reaction of PEMFC. The catalyst has high corrosion resistance, uniform particle distribution size and high specific surface area, and has higher performance and stability than commercial platinum-carbon catalysts.

The invention relates to an S-doped graphite carbon nitride material with an N defect and a preparation method and application thereof, and discloses the S-doped graphite carbon nitride material with the N defect, the S-doped graphite carbon nitride material with the N defect has dual functionality, and due to the dual functionality, the S-doped graphite carbon nitride material can be used for organic synthesis of green energy under a photocatalytic system and can also be used for treating antibiotic pollution of a water environment; the method shows huge application potential in the fields of environment treatment and clean energy. The preparation method comprises the following steps: calcining melamine in air to form original graphite phase carbon nitride CN-E, heating, cleaning and drying the CN-E and sublimed sulfur powder under a water bath condition, and calcining in nitrogen to obtain a faint yellow powder material SCN-E polymer, namely the S-doped graphite carbon nitride material with the N defect.

The invention discloses a photovoltaic cable resistant to high temperature and long in service life and a preparation method thereof, and relates to the technical field of power cables, a Y-shaped plate is connected between the top ends of two adjacent arc-shaped plates, the Y-shaped plate is located in a gap between two adjacent conductors, and a limiting groove is welded to the outer side of a supporting sleeve and located between the two adjacent arc-shaped plates. According to the cable, when the cable burns, the expanded graphite expands, the expanded graphite is diffused into the diffusion opening, the silicone rubber layer is made of a ceramic silicone rubber material, so that the cable is not prone to cracking, and the cable is not prone to cracking, so that the service life of the cable is prolonged, the service life of the cable is prolonged, and the service life of the cable is prolonged. The ceramic silicone rubber can be quickly hardened into a hard ceramic shell after being burnt, so that expanded graphite is tightly stacked between the ceramic shell and the outer side of the conductor, the expanded graphite carbon layers stacked layer by layer are matched with the flame-retardant plate, flame is fully prevented from spreading towards the interior of the cable which is not burnt, and the flame-retardant effect of the cable is good.

The invention provides a low-temperature sodium-ion battery containing a modified negative electrode as well as a preparation method and application of the low-temperature sodium-ion battery. The low-temperature sodium-ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises negative electrode slurry, and the negative electrode slurry comprises an active substance, conductive carbon, sodium carboxymethyl cellulose and butadiene styrene rubber; the active substance comprises modified hard carbon; the modified hard carbon is prepared by oscillating and mixing hard carbon with a single-walled carbon nanotube, graphite carbon and soft carbon to obtain physical coating, further oscillating and mixing with the doped modified precursor powder, and calcining at high temperature to complete element doping and chemical coating; and the electrolyte comprises an additive selected from trimethylsilyl nicotinate, methyl 4-hydroxy-3-methoxycinnamate and the like. On one hand, the adhesive force of the negative electrode slurry on the current collector is improved, on the other hand, the solvent formula is optimized, the desolvation ability of sodium ions in the electrolyte is improved, the viscosity is reduced, and the additive is added to modify an electrode surface interface film, so that the charge-discharge performance of the battery at low temperature is improved.

The invention relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out thermal polymerization on a first carbon source to obtain soft carbon microspheres; carrying out spray coating, cooling curing and first heating activation on soft carbon microspheres, a second carbon source, graphite carbon nanodots and an activating agent, and then neutralizing and washing with acid to obtain a porous carbon sphere precursor; under an inert atmosphere, feeding a silicon source into the porous carbon sphere precursor, and carrying out secondary heating, so that the silicon source is cracked, and the silicon elementary substance is deposited and adsorbed in the porous carbon sphere to obtain a porous silicon carbon sphere; and heating the porous silicon carbon spheres, introducing an organic gas, and forming a carbon layer on the surfaces of the porous silicon carbon spheres to finally obtain the silicon carbon negative electrode material. After the obtained silicon-carbon negative electrode material is rolled by an external force, particle breakage caused by separation of the porous carbon spheres and the heterogeneous porous carbon layer can be avoided, and the structural strength of the silicon-carbon negative electrode material is improved, so that the capacity of a battery system is improved, and the cycle life of the battery system is prolonged.

The invention belongs to the technical field of hard alloy, and particularly relates to a method and device for controlling carbon atmosphere during sintering of a hard alloy compact, and the device comprises a graphite bottom plate, a spraying boat, a graphite recarburization column and an aluminum oxide carbon reduction column, the graphite recarburization columns and the aluminum oxide carbon reduction columns are used for correspondingly increasing and reducing the carbon atmosphere during sintering in different intervals, the method is used for sintering forming in the hard alloy production process, and the performance of the hard alloy can be stably improved by controlling the carbon atmosphere in the sintering furnace.

The invention provides a surface modified carbon negative electrode material, a preparation method thereof and a battery. The preparation method comprises the following steps: mixing a graphite carbon source and a pore-forming agent, and graphitizing the obtained mixture to form porous graphite; performing oxidation treatment on the porous graphite to prepare porous graphite oxide particles; the porous graphite oxide particles are placed in a tin source solution containing tin cations, the tin source solution is attached to the surfaces of holes of the porous graphite oxide particles, and tin oxide attached to the surfaces of the holes of the porous graphite oxide particles is formed based on the tin source solution; and the porous graphite oxide particles are placed in a carbon-containing reducing gas environment to be subjected to calcination treatment, and the carbon-coated tin nanowires are prepared on the basis of the tin oxide. According to the preparation method, the surface and holes of the carbon negative electrode material are modified by adopting the carbon-coated tin nanowires, so that the discharge performance of the battery at relatively high rate can be effectively improved.

To provide CV graphite cast iron that is not expensive and exhibits high strength from the surface to the internal region, a heat-treated product of CV graphite cast iron, and a method for producing the same.SOLUTION: This CV graphite cast iron is composed of graphite, carbides, and a matrix, and contains, based on the total amount of the CV graphite cast iron, 3.50 to 3.90 mass% of C, 1.50 to 2.00 mass% of Si, 0.85 to 1.15 mass% of Mn, 0.025 mass% or less of P, 0.025 mass% or less of S, 0.006 to 0.013 mass% of Mg, 1.65 to 1.85 mass% of Cu, 0.60 to 0.80 mass% of Ni, 0.45 to 1.00 mass% of Mo, 0.20 to 0.40 mass% of V, 0.20 to 0.40 mass% of Cr, the balance being Fe and inevitable impurities. The carbon equivalent, defined as the total of C and one-third of Si, is 4.00 to 4.50 mass%.SELECTED DRAWING: Figure 1

The invention relates to the technical field of electrocatalysis, in particular to a preparation method and application of a novel bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst, and the preparation method comprises the following steps: S1, adding urea and ammonium chloride into water, stirring, freeze-drying and grinding to obtain a chelating ligand; s2, adding bismuth citrate into the chelating ligand, and carrying out solid-phase reaction to obtain a precursor; and S3, calcining the precursor under the protection of nitrogen to obtain the bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst. The problems that reduction and reconstruction reactions are likely to happen in the CO2 electrocatalytic reduction catalysis process, and the difficulty of active site recognition and performance regulation and control is increased can be solved.

The invention relates to a graphite-like carbon film and a preparation method and application thereof, the graphite-like carbon film is a hydrogen-free graphite-like carbon film, the graphite-like carbon film comprises an enhancement layer located on the surface of a substrate and a graphite-like carbon working layer located on the enhancement layer, and the enhancement layer comprises a Cr base layer located on the surface of the substrate and a Cr / C gradient transition layer located on the Cr base layer; the graphite-like carbon working layer is doped with metal Cr, and the doping amount of the metal Cr is 0.5%-5% by atomic percent; in the graphite-like carbon film, the ratio of sp2 C to sp3 C is 1.8 to 4.0. Graphite-like carbon films with different microstructures are prepared by regulating and controlling deposition bias by utilizing a magnetron sputtering technology, and meanwhile, a high-hydrogen-content nano-clustered diamond-like carbon film is selected as a heterogeneous matching pair of the graphite-like carbon film, so that macro-scale super-lubricity of the bias-induced graphite-like carbon film is realized in an inert gas dry nitrogen atmosphere; and the friction coefficient is as low as 0.0035.

The invention relates to the technical field of composite materials, in particular to a graphite carbon nitride catalytic membrane material and a preparation method and application thereof. The preparation method comprises the following steps: mixing melamine, a halogen source and water, drying, and carrying out heat treatment to obtain the halogen intercalation carbon nitride composite material; mixing the halogen intercalation carbon nitride composite material dispersion liquid with a metal salt solution, then adjusting the pH value to be alkaline, carrying out an in-situ coprecipitation reaction to obtain a metal oxide / halogen intercalation carbon nitride heterojunction, and carrying out vacuum calcination on the metal oxide / halogen intercalation carbon nitride heterojunction to obtain metal oxide / halogen intercalation carbon nitride heterojunction composite powder; mixing the metal oxide / halogen intercalation carbon nitride heterojunction composite powder, a polymer carrier and N, N-dimethylformamide to obtain a spinning solution, and performing electrostatic spinning to obtain a nascent fiber membrane; and calcining the nascent fiber membrane to obtain the graphite carbon nitride catalytic membrane material. The preparation method is high in operability, and the prepared material has the characteristics of stable structure and high catalytic efficiency.

The invention relates to the technical field of electrode paste production, and provides an anti-oxidation high-electrical-stability electrode paste and a preparation method thereof, and the electrode paste is prepared from the following raw materials: BN thick-coated coarse SiC, BN thin-coated fine SiC, carbon-coated graphite, ZrO2-carbon composite microspheres, a filler and a binder in a mass ratio of (16-19): (11-14): (29-32): (7-10): (13-16): (15-18). BN thick coating and BN thin coating are respectively carried out on the coarse SiC particles and the fine SiC particles, so that the balance of oxidation resistance and conductivity is realized; the flake graphite is subjected to light oxidation and carbon coating modification, so that electron transfer is promoted while oxygen is isolated, and the problem of conductive phase isolation possibly caused by an antioxidant layer is avoided; zrO2 at carbon composite microspheres are prepared to improve the structural stability and form a complementary anti-oxygen barrier, so that the synergistic improvement of the oxidation resistance and the conductivity of the electrode paste is realized.

The graphite carbon rod cutting machine for graphite production and processing comprises a base, a clamping mechanism is arranged at the front end of a placing seat, the clamping mechanism comprises clamping frames arranged on the upper side and the lower side of the front end of the placing seat, a cutting groove is formed in the middle of each clamping frame, a clamping groove is formed in the middle of one side, close to each other, of each clamping frame, and the cutting mechanism is arranged on the base. A rubber pad is fixedly connected to one side of the clamping groove, the moving mechanism is arranged on the clamping frame, and the moving mechanism comprises fixing rods fixedly connected to the two sides of the clamping frame. Compared with the prior art, the graphite carbon rod cutting device has the advantage that the graphite carbon rod is cut. The front portion and the rear portion of the cutting position are stably clamped by the clamping frame, the cutting stability and the cutting quality can be guaranteed, the third air cylinder drives the push plate to descend to the rear end of the graphite carbon rod to push the graphite carbon rod, an operator can place the graphite carbon rod more conveniently, and use is convenient and fast.

The invention relates to the field of catalytic materials and discloses a copper-zinc-aluminum-alkylated graphite carbon combined catalyst as well as a preparation method and application thereof. The copper-zinc-aluminum-alkylated graphite carbon combined catalyst comprises a copper-zinc-aluminum catalyst and alkylated graphite carbon which are physically mixed, the alkylated graphite carbon is graphite carbon subjected to silane surface hydrophobic modification. The combined catalyst comprises a copper-zinc-aluminum catalyst and alkylated graphite carbon, and based on the hydrophobic property of the alkylated graphite carbon, in the reaction process of catalyzing CO2 hydrogenation to prepare methanol, the thermodynamic equilibrium limitation in the reaction of preparing methanol through carbon dioxide hydrogenation can be broken through by adjusting the equilibrium movement of element reaction, and the catalytic activity of the alkylated graphite carbon is improved. And meanwhile, agglomeration of metal particles can be effectively inhibited. Therefore, the combined catalyst of the present invention can exhibit efficient carbon dioxide conversion rate, excellent methanol selectivity and long-term stability.

The invention provides a wave-absorbing material with an oriented layered structure and a preparation method thereof.The carbon-loaded MOF derivative aerogel wave-absorbing material with the oriented layered structure is prepared through a method of oriented freeze drying, vacuum impregnation and vacuum carbonization, cellulose aerogel with the oriented layered structure is prepared through oriented freeze drying, and then the cellulose aerogel with the oriented layered structure is prepared through vacuum impregnation; the preparation method comprises the following steps: preparing a cellulose aerogel, dipping the cellulose aerogel in an MOF suspension under vacuum, finally performing vacuum carbonization, maintaining the stability of the oriented layered structure of the aerogel through a low-temperature pre-carbonization process, partially converting amorphous carbon into graphite carbon through high-temperature final carbonization, and regulating and controlling the wave-absorbing performance of the carbon-loaded MOF derivative aerogel with the oriented layered structure. The preparation method has the characteristics of simplicity, low cost, environmental protection, high performance and the like, and the prepared aerogel wave-absorbing material with the oriented layered structure has broadband wave-absorbing performance and can be widely applied to the high and new technical fields of communication, aerospace and the like.

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a quickly charged graphite negative electrode material suitable for low temperature, which comprises the following steps: carrying out controllable polymerization on graphite and a carbon source in advance at an oxidizing atmosphere and a temperature T1, and then carrying out carbonization treatment at a protective atmosphere and a temperature T2 to prepare a carbonized material; and mixing the carbonized material with an F-containing polymer, and carrying out micro-decomposition treatment at a temperature T3 to prepare the fast-charging graphite negative electrode material suitable for low temperature. The temperature of the temperature T1 ranges from 280 DEG C to 400 DEG C; the temperature of the temperature T2 ranges from 900 DEG C to 1300 DEG C; the temperature T3 ranges from 360 DEG C to 450 DEG C. The invention also comprises the material prepared by the preparation method and application of the material in a lithium ion battery. The material prepared by the preparation method disclosed by the invention has excellent low-temperature and fast-charging performance.

The utility model relates to the technical field of screening equipment, in particular to a flat screening device for graphite carbon product raw materials, which comprises a shell, a base arranged on the lower portion of the shell, a sealing cover arranged on the upper portion of the shell, and a screening device arranged in the middle of the shell. The side wall of the shell is provided with the through groove corresponding to the position of the installation support, the outer side wall of the installation support is provided with the sealing plate used for sealing the through groove, the installation support is connected with the sealing plate, and the installation support can be replaced only by pulling out the sealing plate when needing to be replaced. And after replacement is completed, only the sealing plate needs to be inserted inwards, replacement of the sieve plate can be completed, meanwhile, the through groove can be sealed, and the leakage phenomenon in the screening process is avoided.

The application discloses a Fe self-catalytic in-situ lithium supplementing and graphite carbon-coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. 2+ Catalyze PAN to generate sp 2 Carbon, LiBOB-Li2O microcapsule in-situ lithium supplementing, and then ultra-high speed quenching to obtain the product. 2+ Self-catalysis, integration of carbon coating and in-situ lithium supplementing, greatly improving the conductivity, the first charge-discharge efficiency and the rate performance of the material, simple and controllable process, suitable for industrial production, and the prepared material has high compacted density and excellent cycle stability.

The invention belongs to the technical field of high polymer materials, and particularly relates to a low-friction machinable fluorine-containing composite material as well as a preparation method and application thereof. The middle-low friction machinable fluorine-containing composite material is prepared from the following raw materials in percentage by mass: 80-95% of fusible polytetrafluoroethylene and 5-20% of filler, the filler comprises any one or more of graphite, carbon fiber and polytetrafluoroethylene (PTFE). The low-friction machinable fluorine-containing composite material provided by the invention has low friction coefficient and high compression strength at the same time.