43 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 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 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.

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 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 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 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.

A method for producing a hard coating on a substrate, wherein the hard coating comprises a hydrogen-free amorphous carbon coating, wherein the amorphous carbon coating is deposited onto the substrate using a cathodic arc discharge deposition technique, wherein a bias voltage is applied to the substrate with an absolute value greater than 0 V, preferably greater than 10 V and less than 1000 V, and wherein the absolute value of the bias voltage is increased during the coating process to obtain a first structure and a second structure and a gradient between the first and second structures along the coating thickness, wherein the first and second structures comprise sp2 and sp3 carbon bonds but differ in their relative concentration,wherein at least one coating pause is applied during the coating process in order to reduce the substrate temperature during the coating pause.

A method of densifying a plasma-resistant coating layer includes applying a fluorocarbon material including CxHyFz (where x and z are each independently a real number greater than 0, and y is an integer greater than or equal to 0) to a surface of a base material having a surface including YaOb (where a and b are each independently a real number greater than 0) to form a fluorocarbon coated base material, and projecting a pulsed laser beam onto a region of the fluorocarbon coated base material to form a coating layer over the base material, in which coating layer yttrium (Y) and fluorine (F) are bonded together, wherein the coating layer is formed by a laser sintering process occurring by projecting the pulsed laser beam.

The application relates to a two-dimensional ultrathin sodium titanate nanosheet / carbon composite electrode material and a preparation method and application thereof. The composite electrode material has a two-dimensional layered structure, a particle size of 2-30 mu m, and a thickness of 8-12 nm. The composite electrode material is composed of internal few-layer reduced graphene oxide, an outer layer of ultrathin sodium titanate nanosheet, and nitrogen-doped carbon coated on the surface of the ultrathin sodium titanate nanosheet. Compared with the prior art, the preparation process is simple, easy to scale up, and controllable. The pore size, specific surface area and mesostructure of the obtained material can be adjusted. The sodium-ion battery or sodium battery containing the material has the advantages of high energy density and power density, and shows a broad market application prospect.

This method for producing porous silicon comprises a granulation step S2, a carbon coating film formation step S3, a reduction step S4, and a cleaning step S5. The granulation step S2 is a step for obtaining a granule in which primary particles containing a silicon oxide powder are aggregated. The carbon coating film formation step S3 is a step for forming a carbon coating film on the granule surface to obtain a precursor particle in which the surface is coated with a carbon coating film and silicon oxide powder is the primary particle. The reduction step S4 is a step for bringing the precursor particle into contact with Mg vapor to obtain a reduced particle in which the surface is coated with a carbon coating film and an Si- and MgO-containing mixture is the primary particle. The cleaning step S5 is a step for removing MgO from the reduced particle to obtain a porous silicon particle in which the surface is coated with a carbon coating film and pore-bearing porous silicon is the primary particle.

To provide a surface-coated cutting tool that is able to sufficiently improve the sharpness (the cutting quality) of a cutting edge and is able to further reduce cutting resistance, by reducing a film thickness to reduce surface roughness to small roughness, while maintaining the wear resistance of the tool in cutting work using CFRP as a workpiece.SOLUTION: A surface-coated cutting tool includes a tool base material and an amorphous carbon film 2 coating at least a cutting edge of a surface of the tool base material; the amorphous carbon film 2 contains 0.1% or more and 14% or less of Ta in atomic %; and when a cross-sectional image of the amorphous carbon film 2 is observed, an average grain size of TaC micro-crystals 3 present in a matrix of the amorphous carbon film 2 is 7nm or less.SELECTED DRAWING: Figure 3

The invention relates to the technical field of coatings, in particular to a conductive carbon-coated copper foil automatic coating treatment device and method.The conductive carbon-coated copper foil automatic coating treatment device comprises a bracket and a coating head which is arranged on the top of the bracket and can conduct coating on copper foil, and further comprises a first-stage rough brushing system which comprises a stainless steel brush roller capable of conducting mechanical scraping on the copper foil; the two ends of the stainless steel brush roller are provided with cooling pipelines allowing cooling liquid to circulate, and a cooling assembly is arranged in the stainless steel brush roller. The second-stage fine brushing system comprises a swing plate and a plurality of spherical polishing heads arranged at the bottom of the swing plate, connecting handles are connected to the two ends of the swing plate, and the second-stage fine brushing system further comprises a swing assembly capable of driving the connecting handles to incline so as to drive the swing plate to move; the three-stage polishing and brushing system comprises a polishing roller internally provided with an air cushion seam, a main frame communicating with the polishing roller through a communicating pipe, an air pump capable of providing an air source for the air cushion seam, and a static electricity removing assembly sharing the same air source with the air cushion seam.

The invention discloses a surface optimization method of sodium ion conductor coated biomass hard carbon and an application of the surface optimization method in a sodium ion battery, a biomass raw material is pretreated to obtain precursor powder, and the precursor powder is subjected to high-temperature carbonization treatment in inert gas to obtain preliminary carbonized powder; and fully grinding the preliminarily carbonized powder, a sodium source and a phosphorus source together, and performing secondary sintering in inert gas to form a coating layer, thereby obtaining the surface-optimized high-magnification biomass hard carbon material. The surface of the hard carbon material is optimized through sodium ion conductor coating, so that side reaction between the material and electrolyte is effectively inhibited, the interface stability is improved, the conduction efficiency of sodium ions at the interface is improved, and the high-rate hard carbon material is prepared, serves as a sodium ion battery negative electrode, has excellent rate capability and cycling stability, and can be used as a lithium ion battery negative electrode. The application prospect is wide.

The invention relates to an isostatic pressing graphite base material for silicon carbide vapor phase method crystal growth and a preparation method of the isostatic pressing graphite base material. The isostatic pressing graphite base material comprises an isostatic pressing graphite base body and a pyrolytic carbon coating deposited on the surface of one side of the isostatic pressing graphite base body. The preparation method comprises the following steps: carrying out ultrasonic cleaning and vacuum heat treatment on an isostatic pressing graphite material to obtain an isostatic pressing graphite substrate; and putting the isostatic pressing graphite substrate into a deposition furnace, introducing a carbon source gas and a diluent gas, and depositing the pyrolytic carbon coating on the surface of one side of the isostatic pressing graphite substrate. The composite structure of the isostatic pressing graphite matrix and the surface pyrolytic carbon functional layer is adopted, and the performance limitation of a single material is broken through; the pyrolytic carbon coating effectively prevents impurity diffusion in a graphite matrix, the stability of a SiC crystal growth interface is improved, and the crystal quality and the growth efficiency are remarkably improved; compared with a full-pyrolytic carbon part, the cost of the composite structure is reduced by 60% or above, and the growth performance is improved by 20% or above.