60 results about "Carbon coated" patented technology

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a spinel type metal oxide coated hard carbon composite material based on a lattice matching mechanism, and a gradient doping preparation method of the spinel type metal oxide coated hard carbon composite material can overcome the defects that a hard carbon material is low in initial coulombic efficiency (about 50%), low in lithium ion transmission rate and poor in rate capability. According to the invention, magnesium salt, aluminum salt, copper salt and other metal salts are mixed with hard carbon, a precipitant is added, and a hydrothermal method is combined with a calcination process to obtain the core-shell structure composite material with hard carbon coated with a spinel structure. The technology has the following three obvious advantages: (1) lattice adaptive design of the spar type metal oxide and the hard carbon, (2) molybdenum-copper gradient doping repair of the SEI film, and (3) stable circulation of more than 5000 times at the capacity of 350mAh / g.

The invention belongs to the technical field of coating material preparation, and particularly relates to a copper-titanium co-doped amorphous carbon coating and a high-throughput preparation method. The invention firstly provides a high-throughput preparation method, the method does not need to prepare a plurality of target materials with different metal contents, a plurality of deposition samples can be obtained only by preparing a plurality of matrixes once through ingenious arrangement of matrix sample positions and specific quality control index requirements, and then test screening is carried out in combination with the quality control index requirements. And the bimetallic-doped amorphous carbon coating with the optimal performance can be rapidly screened out with relatively low process cost for practical application.

The invention belongs to the technical field of composite materials and radomes, and particularly relates to a layer structure of a radome body and a manufacturing method. The skin comprises a first skin layer, an interlayer, a second skin layer and a polyvinyl fluoride film layer which are sequentially arranged from top to bottom. Through collaborative design of a micro-nano composite structure and a low-surface-energy material, a self-cleaning surface skin layer with super-hydrophobicity, high wave transmission and weather resistance is constructed. Compared with a traditional fluorocarbon coating, the wave transmission rate is 60-70% and is improved by more than 25%, the signal transmission loss is remarkably reduced, and the harsh requirement for the wave transmission performance of the antenna housing is met. The cleaning cost of a traditional antenna housing can be saved by more than 80%, especially for high-altitude and complex-structure antenna housings, high-altitude operation or special equipment is not needed, and the maintenance safety risk is reduced. The replacement frequency of the radome caused by aging and abrasion of the coating can be reduced, and the overall life cycle cost of equipment is reduced.

The invention relates to the field of energy storage batteries, in particular to a surface modification method of a carbon-based negative electrode material for a lithium ion battery and the carbon-based negative electrode material.The surface modification method comprises the following steps that S1, the carbon-based material, soluble saccharides, a lithium source and a solvent are mixed; s2, carrying out ball milling treatment on the slurry to obtain a precursor mixture; s3, calcining the precursor mixture to obtain a primary modified carbon material; s4, treating the primary modified carbon material in ozone to obtain an oxidation modified carbon material; and S5, dispersing the oxidation modified carbon material in a solution containing a conductive monomer and an oxidizing agent for chemical polymerization reaction, and depositing on the surface of the carbon material to form a polymer coating layer, thereby obtaining the surface modified carbon-based negative electrode material. By constructing a pre-lithiated carbon coated inner core and an ozone activation interface and preparing a modification layer of a conductive polymer, the core problems that a traditional carbon negative electrode is low in first efficiency, short in cycle life and poor in rate capability and is difficult to consider at the same time are solved.

The invention provides a magnetically soft alloy-based wave-absorbing composite material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The wave-absorbing composite material provided by the invention comprises various magnetically soft alloy substrates prepared from elements such as iron, cobalt, nickel and the like and nitrogen-doped carbon coating the surfaces of the magnetically soft alloy substrates. The coercive force of the soft magnetic alloy is relatively low, so that the magnetic domain wall movement and magnetic moment rotation resistance in the material are reduced, the magnetic conductivity is relatively high, and the nitrogen-doped carbon with high dielectricity is combined to construct a magnetic-dielectric structure, so that the impedance matching between the composite material and the space is improved, and the efficient absorption of electromagnetic waves is promoted. The magnetically soft alloy-based wave-absorbing composite material has the characteristics of strong electromagnetic wave absorption performance and wide absorption frequency band, and is simple in preparation technology and easy for large-scale production.

The invention discloses a high-performance silicon-carbon negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery materials, the high-performance silicon-carbon negative electrode material comprises a porous carbon material, the surface of the porous carbon material is successively deposited with a carbon nanotube network and nano silicon, the porous carbon material on which the carbon nanotube network and the nano silicon are deposited is also provided with a secondary outer layer carbon shell and an outer layer carbon shell from inside to outside; according to the invention, double optimization of the silicon-carbon negative electrode material is realized through a unique structural design: (1) the volume expansion effect of nano silicon is relieved through cooperation of the carbon nanotube network and the multi-layer carbon shell; and (2) the migration rate of lithium ions is accelerated by the carbon nanotubes and the multi-layer carbon coated structure, and the prepared silicon-carbon negative electrode material has excellent cycling stability and rate capability.

This invention belongs to the field of new energy materials, specifically relating to a heterogeneous hollow multi-shell nanocomposite material, its preparation method, and its application. The nanocomposite material is formed by nitrogen-doped carbon coating on the surface of a bimetallic sulfide, wherein the bimetallic sulfide is a composite of MoS2 and FeS. The nanocomposite material has a porous, hollow multi-shell nanosphere structure, with voids between the internal shells. This material serves as a Na... + The negative electrode material for this battery exhibits excellent electrochemical performance. Benefiting from the built-in electric field formed by the heterostructure and the unique hollow multi-shell morphology, this composite material demonstrates significant cycle stability and rate performance, and possesses rapid Na+ cycling characteristics. + Transport dynamics.

The present disclosure provides a cathode composite comprising: (i) an active material; (ii) at least one primary carbon; (iii) at least one secondary carbon; and (iv) at least one binder, wherein the primary carbon is coated on the active material, and the secondary carbon is coated on the primary carbon; coating density of the primary carbon and the secondary carbon coated over the active material is in a range of 0.01 g / cc to 0.15 g / cc; and combined thickness of the primary carbon and the secondary carbon is in a range of 55 to 540 nm.

A coating system to be used as thin film sensor includes a piezoresistive sensor element. The piezoresistive sensor element is a layer embedded in the coating system. The coating system is deposited on a surface of a substrate. The piezoresistive sensor element comprises at least one hydrogen free tetrahedral amorphous carbon coating doped with a ta-C:X coating layer, where X is one or more chemical elements selected from the elements groups 13 and 15 of periodic table of elements, wherein the ta-C:X coating layer exhibits an anisotropic gage factor.

The invention belongs to the technical field of batteries, and particularly relates to a silicon-carbon composite material and a preparation method thereof, an electrode and a battery, and the method comprises the following steps: uniformly mixing asphalt, potassium hydroxide and a doping agent, heating to a first preset temperature, introducing a cross-linking agent mixed gas according to a first preset flow, carrying out first activation, and cooling to obtain asphalt-based porous carbon; adding the asphalt-based porous carbon into an aldehyde compound solution, adding a phenolic compound and a catalyst, uniformly mixing, carrying out hydrothermal reaction, filtering, and carrying out second activation to obtain the hard carbon coated soft carbon porous carbon composite material; soaking the porous carbon composite material in a liquid silane solution, and reacting under a closed condition and negative pressure to obtain an intermediate material; heating asphalt to a molten state, adding the intermediate material and an organic niobium compound, uniformly stirring, and carbonizing to obtain a silicon-carbon composite material; the composite material has the advantages of low expansion, high pore volume, low impedance and high compaction density, and the electrochemical performance of the battery is improved.

Disclosed is a high temperature-resistant carbon-coated optical fiber, characterized in that said optical fiber comprises a core layer, a cladding layer, a carbon coating layer, and a resin coating layer which are sequentially arranged from the inside to the outside; the carbon coating layer comprises a first carbon film layer and a second carbon film layer; the first carbon film layer is a graphite-like amorphous carbon film; the second carbon film layer is a diamond-like amorphous carbon film or a graphite-like amorphous carbon film, or the second carbon film layer is a composite carbon film layer formed by stacking at least one graphite-like amorphous carbon film and at least one diamond-like amorphous carbon film in the thickness direction. Also disclosed are a corresponding preparation method and system, which solve the problem that optical fiber on which a layer of carbon film has been deposited cannot be preheated during traditional cold-wall chemical vapor deposition. The graphite-like amorphous carbon film deposited on the inner layer of the optical fiber of the present invention can be tightly bonded to the optical fiber and has good sealing performance, while the diamond-like amorphous carbon film deposited on the outer layer has high mechanical strength and good wear resistance, which can provide good protection for the optical fiber.

High temperature lubricants for magnetic media include a plurality of segments according to general formula (I):where Rd is any linker chemistry and each Re may be a reactive end-group and anchoring group containing at least one constituent configured for at least one of tribochemical, thermochemical, or optochemical bonding. The at least one constituent can be cyclopropane or cyclobutane.

The utility model relates to the technical field of diffusion films, and discloses a scratch-resistant wear-resistant quantum dot diffusion film which comprises a protective layer, a transition layer is fixedly connected to the lower end of the protective layer, a diffusion composite layer is fixedly connected to the lower end of the transition layer, and a substrate layer is fixedly connected to the lower end of the diffusion composite layer. According to the utility model, the diamond-like carbon coating on the surface of the protective layer is used for providing protection for the surface of the membrane material and is matched with the substrate layer and the transition layer which are made of enhanced PET (Polyethylene Terephthalate) materials to provide certain absorption for the internal stress or external impact of the structure, so that the aim of providing stable protection for the subsequent use of the membrane material is fulfilled; the subsequent membrane material is prevented from being damaged due to external scraping or impact, so that the service life of the membrane material is prolonged, the subsequent maintenance cost is further reduced, and the overall practicability of the membrane material is improved.

The present invention discloses a coconut shell-based foamed carbon modified phosphate positive electrode material and its application. The positive electrode material comprises a phosphate positive electrode core and a coconut shell-based foamed carbon coated on the surface of the phosphate positive electrode core. The present invention coats the phosphate positive electrode core with a lightweight sponge-like structure of coconut shell-based foamed carbon, which can form a three-dimensional conductive network between the positive electrode material particles, thereby improving the electronic conductivity between the phosphate positive electrode material particles and accelerating the Li + / electron transfer, reducing electrode polarization effect and lowering the resistivity of the electrode. In addition, the carbon foam coated on the surface of the positive electrode particles can inhibit particle agglomeration and improve the Li + Diffusion dynamics greatly improves the rate performance of lithium-ion batteries. In addition, the coconut shell-based foam carbon on the surface of the main material can effectively inhibit the chemical reaction between the phosphate positive electrode material and the electrolyte, forming a stable interface, thereby increasing the cycle life of the battery and making the battery exhibit excellent electrochemical performance.

The application provides a testing method for carbon coating completeness of a silicon-based material, and belongs to the technical field of material testing. The method comprises the following steps: placing a first mass of strong alkaline material and a second mass of testing silicon-based material in a reaction tank to perform a reaction, and obtaining first current information output by a detection device; placing the first mass of strong alkaline material and a contrast material in the reaction tank to perform a reaction, and obtaining contrast current information output by the detection device; drawing a test image based on the first current information and the contrast current information; and calculating the carbon coating completeness of the testing silicon-based material based on the peak area and the peak current value of the testing silicon-based material in the test image, the peak area and the peak current value of the contrast material, and the second mass and the mass of the contrast material. The testing method for carbon coating completeness of the silicon-based material provided by the application can simply and conveniently test the carbon coating completeness of the silicon-based material.

The application provides a kind of silicon-carbon coated negative material carbon coating completeness test method, the test method is through chemical method test silicon-carbon negative material in silicon element carbon coating completeness, this chemical method does not need to use expensive instrument equipment, through ordinary laboratory can satisfy experimental condition;And the data obtained by the above-mentioned chemical method is substituted into formula, the carbon coating completeness data of silicon element in silicon-carbon negative material can be obtained, the method is simple and easy to understand, easy to operate, the same material is verified by the results of multiple experiments of the application, and the coating completeness test is carried out by using the method of the application at different times or different reaction solvents, and the difference between the test conclusions is not more than 0.5%, which can better characterize the coating completeness of the material, and the method provided by the application has good stability.

The invention discloses a nanometer metal wire enhancement-based miniature anti-radiation GNSS antenna and a preparation method thereof, and belongs to the technical field of satellite navigation and antennae, the nanometer metal wire enhancement-based miniature anti-radiation GNSS antenna prepared by the invention shows a remarkable technical effect, and in the aspect of anti-radiation performance, even under the irradiation dose of up to 100kGy, the nanometer metal wire enhancement-based miniature anti-radiation GNSS antenna has the advantages that the anti-radiation performance of the nanometer metal wire enhancement-based miniature anti-radiation GNSS antenna is improved; the signal attenuation rate of the antenna can still be controlled within 5% and is remarkably improved compared with 25% of a traditional copper-based antenna, the resistivity of a conductive network is increased by not more than 10%, meanwhile, the shielding efficiency reaches up to 90% or above through the amorphous carbon coating, and penetration damage of high-energy particles is effectively resisted. In the aspects of miniaturization and flexibility, the size of the antenna is only (1-10) cm * (1-10) cm * (0.1-1) mm, the weight is smaller than 5 g, the antenna can be installed by being attached to a curved surface with the radius being 10 mm, the flexibility and adaptability of installation are greatly improved, and the antenna is suitable for complicated scenes such as petrochemical pipelines and unmanned aerial vehicle bodies.

The invention discloses a metal monatomic modified carbon-coated graphite material and a preparation method and application thereof, and belongs to the technical field of lithium batteries, the preparation method of the material comprises the following steps: mixing a carbon source and graphite, and then carrying out heat treatment in a protective atmosphere to obtain carbon-coated graphite; dipping the carbon-coated graphite in a metal salt solution, and drying to obtain a mixture; the mixture is sintered in a reducing atmosphere, metal ions in the metal salt are reduced into metal single atoms, the content of the metal single atoms in the carbon-coated graphite is adjusted through acid pickling, and the metal single atom modified carbon-coated graphite material is obtained. According to the invention, metal monatomic atoms are introduced into the material, so that the electrolyte is catalyzed to form a uniform inorganic phase, and the long cycle stability and fast charge performance of the battery are remarkably improved. The hard carbon coated graphite negative electrode material prepared by the invention has the characteristics of low internal resistance, high magnification and high first-circle coulombic efficiency.

The invention relates to an electrochemically active powder comprising particles containing a compound represented by formula AaMm(XO4)n wherein A comprises an alkaline metal; M comprises at least one transition metal and optionally at least one non-transition metal; and X is chosen among S, P and Si; wherein 0<a≤3.2; 1≤m≤2; and 1≤n≤3; wherein said particles are at least partially coated with a layer comprising a carbonaceous material, said carbonaceous material comprising a highly ordered graphite, wherein said highly ordered graphite has a ratio (I1360 / I1580) of a peak intensity (I1360) at 1360 cm−1 to a peak intensity (I1580) at 1580 cm−1, obtained by Raman spectrum analysis, of at most 3.05.

The invention discloses a cerium ion doped thermal cracking carbon coated sodium vanadium fluorophosphate positive electrode material, a preparation method and application, and belongs to the technical field of sodium ion battery positive electrode materials. The preparation method comprises the following steps: (1) dissolving a vanadium source, a phosphorus source, a sodium source, a fluorine source, a cerium source and a reducing agent in deionized water, heating, uniformly stirring, and freezing into a solid; and (2) removing moisture from the frozen solid, crushing, and then carrying out microwave sintering to prepare the cerium ion doped thermal cracking carbon coated sodium vanadium fluorophosphate positive electrode material. The cerium ion-doped thermal cracking carbon-coated sodium vanadium fluorophosphate positive electrode material is prepared by doping cerium ions, the particle aggregation phenomenon of the doped and modified material is obviously weakened, the particle distribution is more uniform, more active sites can be provided to be in contact with an electrolyte, the electrochemical reaction efficiency is improved, and the electrochemical performance of the material is further enhanced.

The invention relates to the technical field of carbon-coated aluminum foils, and particularly discloses a carbon-coated slurry and a preparation method and application thereof, the carbon-coated slurry is prepared from the following components by mass: 5%-15% of a composite conductive material, 25%-40% of a binder, 50%-65% of a solvent, and 0.05%-0.5% of a dispersant; wherein the composite conductive material is formed by mixing carbon black, graphite and graphene according to the mass ratio of (5-8): (1-3): (1-2). The composite conductive material disclosed by the invention is formed by mixing the carbon black, the graphite and the graphene, so that the film resistance of the carbon-coated aluminum foil can be remarkably reduced, the conductivity is improved, and the overall electronic conduction performance is improved.

The application discloses a preparation method of a pyrite particle electrode based on a mechanochemical method, and adopts a normal-temperature wet-type ball milling process to simultaneously perform particle size refining, surface defect construction and nitrogen-doped carbon coating on natural pyrite and defatted soybean powder in an organic solvent, so that the destruction of a crystal form caused by high-temperature treatment is avoided. Then, the obtained composite powder is mixed with acetylene black, and ion cross-linking forming is performed on sodium alginate and calcium chloride in a low-temperature environment, so that a particle electrode with a three-dimensional porous structure is prepared. The method solves the problems of easy agglomeration and loss of the powder and poor conductivity, and the prepared electrode exhibits excellent charge transfer performance and catalytic activity in a 3DERs-PS system, has high degradation efficiency on rhodamine B and good cycle stability, and realizes efficient treatment of organic wastewater.

The invention discloses a diamond-like carbon (DLC) coating and a preparation and use method thereof, and relates to the technical field of diamond-like coatings, and the preparation and use method specifically comprises the following steps: step S1, graded cleaning and ion etching pretreatment of a base material; step S2, in-situ synthesis of a Ti-TiC-SiC gradient transition layer is carried out; and S3, constructing the silicon / boron co-doped nano-composite functional layer. According to the invention, the interface stress is relieved by constructing the gradient transition layer, a soft and hard alternate nano layered structure is formed by using a periodic modulation process, and a silicon-boron co-doping strategy is combined; the problems that the coating is large in internal stress, poor in binding force and prone to failure at high temperature are effectively solved, and unification of high hardness, high toughness and excellent high-temperature wear resistance is achieved.

The utility model belongs to the technical field of optical fiber manufacturing equipment, and particularly relates to an optical fiber carbon coating control system arrangement structure. Through reasonable arrangement of the optical fiber drawing furnace, the preheating furnace, the reaction cavity and the reaction gas adjusting pipeline, the optical fiber carbon coating equipment is compact in overall structure and convenient to install and maintain, the cost of the optical fiber carbon coating equipment can be effectively saved, the installation space is saved, and the distance between the reaction cavity and the preheating furnace can be conveniently adjusted by arranging the reaction cavity lifting device; therefore, the temperature stability of the optical fiber reaction section in the reaction cavity is ensured, and the uniformity of carbon film thickness deposition is ensured. The nitrogen inlet pipeline, the acetylene inlet pipeline and the exhaust pipeline of the reaction cavity are reasonably arranged, and are matched with the pneumatic control valves and the detection instruments arranged on the pipelines, so that the proportion and the gas inlet flow of mixed gas in the reaction cavity can be conveniently adjusted, and the stability and the controllability of carbon film thickness deposition are further improved.

The present disclosure generally relates to magnetic recording heads of magnetic recording devices. To protect and lubricate magnetic elements of the magnetic recording heads (e.g., reader sensors), a coating of carbon is applied to the magnetic element. When there are defects in the carbon coating, the sensor is exposed to air and may corrode causing reader sensor failure. Protrusions and / or recesses may form on the MFS of the sensor when materials that are too hard (e.g., CoHf or Ru) or too soft (e.g., IrMn) are used in the spacer or capping layer of the sensor. By laminating, co-sputtering, or using an alloy with hard materials (e.g., Ta, Ru, and / or Hf) and / or soft materials (e.g., Al, Ti, Cr, and / or Ni) in the spacer and capping layer of the sensor, the formation of protrusion and recesses in the reader sensor may be mitigated.

The invention relates to modified graphite, a negative electrode material, a preparation method, a pole piece and a battery. And the negative electrode material comprises graphite and soft carbon coated outside the graphite, the average pore size of the negative electrode material is 5-15 nm, the micropore proportion is 7%-20%, and the specific surface area of the raw material modified graphite can be 0.6-12 m < 2 > / g. The pole piece comprises a current collector and an active material layer located on the current collector. The active substance layer comprises a negative electrode material, and the electrode plate tortuosity D of the electrode plate is 0.4%-2%. According to the invention, the compaction density of the pole piece, the energy density of the battery and the fast charge level can be effectively improved.

The utility model relates to the technical field of optical films, in particular to a multilayer composite brightness enhancement film. The technical scheme comprises a base material film layer. According to the utility model, the brightness enhancement film layer, the light scattering film layer, the anti-reflection film layer, the polarizing film layer, the anti-fouling film layer and other structures are matched, and the brightness enhancement film layer and the light scattering film layer enable a light source to be more uniform through uniform scattering and light direction adjustment, so that uneven brightness and color cast are avoided. The anti-reflection film layer keeps the primary color of display content by reducing surface reflection, and interference of an external light source is avoided. And the polarizing film layer is used for ensuring the polarization control of light, so that the chromatic aberration and uneven brightness caused by watching at different angles are reduced. And then the fluorocarbon coating and the hard coating are arranged in the anti-fouling film layer on the surface of the polarizing film layer, and when the fluorocarbon coating and the hard coating are combined for use, the hard coating provides physical protection, and the durability of the surface is enhanced. Finally, the fluorocarbon coating provides anti-fouling and easy-to-clean functions from chemical and physical properties.

The utility model provides a circuit board with a high reflective film, which comprises a circuit board body, the circuit board body comprises an inner layer, and the upper surface of the inner layer is provided with a first modified copper foil layer, a first composite layer, a first solder mask layer and a high reflective film layer from bottom to top in sequence. A second modified copper foil layer, a second composite layer and a second solder mask layer are sequentially arranged on the lower surface of the inner layer from top to bottom; the first composite layer and the second composite layer are both composite layers formed by compounding plasma fluorocarbon coatings and silane coupling agents. Layer structure arrangement is optimized, and it is ensured that the structure has a good heat dissipation function.

The application provides a preparation method of a silicon carbide single crystal and belongs to the technical field of semiconductor material preparation. The application places silicon carbide raw material for crystal growth in a graphite crucible for loading, then assembles a first graphite support ring, places a seed crystal with a coating on the first graphite support ring, and makes the silicon surface of the seed crystal with the coating face upward; then assembles a second graphite support ring on the first graphite support ring, places a porous graphite plate on the second support ring, and makes a space reserved between the porous graphite plate and the seed crystal with the coating; lays a layer of silicon carbide powder on the surface of the porous graphite plate, then covers a graphite cover, heats, and performs a crystal growth process to obtain a silicon carbide single crystal. The application sets a carbon coating on the back of the seed crystal, can effectively prevent the volatilization of silicon vapor on the back of the seed crystal, and further prevents the corrosion on the back of the seed crystal; meanwhile, through the optimization design of the seed crystal support structure, the corrosion on the back of the seed crystal can be further prevented, and high-quality silicon carbide single crystals can be finally obtained.

The invention discloses a microporous carbon-coated core-shell nano composite material, a preparation method and application, and relates to the technical field of lithium batteries, and the preparation method comprises the following steps: uniformly dispersing silicon powder and graphite in a solvent to form a core material suspension; dopamine hydrochloride and hydrogen peroxide are added into the nuclear material suspension, polymerization reaction is carried out at the temperature of 60-85 DEG C, composite slurry is obtained, and the ratio of the total mass of the silicon powder and the graphite to the mass of the dopamine hydrochloride is 1: (0.1-0.5); carrying out spray drying treatment on the composite slurry to obtain precursor powder; sintering the precursor powder at high temperature to obtain a microporous carbon coated core-shell nano composite material; the microporous carbon-coated silicon / graphite core-shell nano composite material is prepared by adopting a polydopamine in-situ polymerization technology initiated by hydrogen peroxide and combining a subsequent spray drying and carbonization process, and the material has good rate capability, cycling stability, charge-discharge efficiency and low interface impedance.