83 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 present disclosure generally relates to a method for producing a crystalline NFPP material comprising: a) providing an NFPP precursor material; b) combusting the NFPP precursor material at a temperature of from 200°C to 700°C for 5 to 90 minutes, preferably from 5 to 30 minutes, to yield a carbon coated NFPP material; c) grinding the carbon coated NFPP material into particles; and d) heating the particles obtained in step c) at a temperature of from 400°C to 800°C to yield a crystalline NFPP material, wherein step a) of providing the NFPP precursor material comprises: i) providing an aqueous mixture by mixing a metal nitrate (MeNO3) with sodium dihydrogen phosphate (NaH2PO4) and ascorbic acid (C6H4O2(OH)4), ii) adding citric acid (C6H8O7) to the aqueous mixture, iii) heating the aqueous mixture obtained in step ii) to yield the NFPP precursor material. The present disclosure also relates to a crystalline NFPP material obtained by the method and to a cathode comprising the crystalline NFPP material. Furthermore, the present disclosure relates to a sodium ion battery cell comprising the cathode.

The invention discloses a continuous micro hard carbon network coated graphite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, adding a mixed solution of acid and hydrogen peroxide into waste negative electrode powder for leaching, washing, precipitating, removing impurities, drying, and carrying out heat treatment to obtain conductive agent loaded graphite; s2, adding the conductive agent loaded graphite in the step S1 into a hard carbon polymer precursor solution to obtain a mixed solution, and after mixing dispersion and melt dipping treatment, drying and curing to obtain graphite containing hard carbon; and S3, performing carbonization treatment on the graphite containing the hard carbon in the step S2, and performing screening and sorting to obtain the low-coating-amount continuous network hard carbon coated graphite negative electrode material. The graphite negative electrode material prepared by the method is low in coating amount, long in cycle life, high in lithium ion migration rate and simple in coating process.

Thermal imaging may be used for obtaining measurements of a tribological testing apparatus including a contact temperature. For example a method of calculating a contact temperature may include: introducing a testing sample into a contact zone of a tribological testing apparatus; engaging a testing operation of the tribological testing apparatus; measuring a contact emission of a testing surface of the tribological testing apparatus with an infrared camera; and calculating a contact temperature of the testing sample in the contact zone from the contact emission; wherein the tribological testing apparatus has a carbon coating on the testing surface of the contact zone, wherein the carbon coating has a first infrared emissivity, wherein the testing sample has a second infrared emissivity, and wherein the first infrared emissivity is within + / −20% of the second infrared emissivity.

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 present disclosure provides novel processes for producing carbon coated SnO2 and TiO2 electrode materials by chemically vapor depositing carbon. The novel processes described herein yield electrode materials with improved electrochemical properties.

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.

The invention discloses a preparation method and application of a fluorine-doped carbon material, and relates to a preparation method and application of a carbon material. The method comprises the following steps: 1, preparing a sodium fluoride solution; 2, dropwise adding perchloric acid into the sodium fluoride solution to obtain a mixed solution; 3, adding a carbon material into the mixed solution; and 4, carrying out hydrothermal reaction to obtain the fluorine-doped carbon material. By optimizing the preparation process of the fluorine-doped carbon material, the compactness and uniformity of the protective layer are realized, the corrosion resistance and cycling stability of the zinc negative electrode are remarkably improved, and an important technical support is provided for large-scale application of the water-based zinc ion battery. The prepared zinc negative electrode with the fluorine-doped carbon coating on the surface is used as a negative electrode of an aqueous zinc ion battery. The fluorine-doped carbon material prepared by the invention can effectively improve the corrosion resistance and cycling stability of the zinc negative electrode, and provides technical support for large-scale application of the water-based zinc ion battery.

The invention discloses a titanium sodium phosphate coated carbon composite manganese-based Prussian blue material and a preparation method thereof, as a positive electrode material, a carbon material is added into a manganese-based Prussian blue slurry subjected to primary aging, and then secondary aging is performed, so that the electronic conductivity of the Prussian blue material is increased, and the conductivity of the Prussian blue material is improved; then adding the sodium titanium phosphate slurry with fixed particle size and concentration at a certain speed, heating and stirring, and then carrying out third aging; by controlling the time and temperature of three times of aging, the sodium titanium phosphate / carbon coated manganese-based Prussian blue positive electrode material with a stable structure and a uniform phase can be obtained. The invention also discloses a sodium ion battery, a positive electrode adopts the titanium sodium phosphate / carbon coated manganese-based Prussian blue positive electrode material, a negative electrode adopts the same titanium sodium phosphate, and the capacity and cycle performance of the battery are tested. The result shows that the battery assembled by using the titanium sodium phosphate coated carbon composite manganese-based Prussian blue material as the positive electrode has excellent specific capacity and better cycle performance.

The invention provides a preparation method of a conductive interconnection structure, and the method comprises the steps: carrying out the wet cleaning technology of a semiconductor structure after the first openings are formed after a second hard mask layer and a first hard mask layer are etched, and taking deionized water as a wet cleaning solution, the film quality of the anti-reflection coating at the bottom of the first opening can be prevented from being changed, the filling performance of the spin-coating carbon coating for filling the first opening is improved, and the spin-coating carbon coating is prevented from generating a cavity defect; therefore, the situation that the outline of the first hard mask layer on the side wall of the first opening is abnormal due to the fact that chemical liquid used in the wet cleaning process of the semiconductor structure after the second opening is formed enters the spin-coating carbon coating is avoided; therefore, the morphology and the transverse size of a through hole formed by subsequent integrated etching are not affected by the contour of the first hard mask layer and the void defect of the spin-coated carbon coating, thereby solving the problem of open circuit of a rear-section metal interconnection line, and improving the yield of a device.

The invention relates to the technical field of lithium ion batteries, in particular to a screening method of recycled graphite and a manufacturing method of a negative plate. The screening method provided by the invention comprises the following steps: carrying out primary screening according to whether the recycled graphite is subjected to carbon coating or not, and screening out the carbon-coated recycled graphite; the recycled graphite obtained after primary screening is subjected to secondary screening, and the indexes of secondary screening are particle size distribution, tap density, specific surface area, gram volume and first effect; the recycled graphite obtained after secondary screening is subjected to third-time screening, and indexes of third-time screening are Dv10, Dv50 and Dv90 graphitization degrees and residual carbon amount; the recycled graphite screened for three times is adopted to manufacture a negative plate and matched with a positive plate to manufacture a soft package battery cell, and whether the soft package battery cell is selected or not is determined according to an electrochemical test result. According to the screening method for the recycled graphite, the screening efficiency can be improved, the trial and error cost can be reduced, and the manufacturing cost and the use cost of the lithium ion battery can be reduced.

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 present invention discloses a silicon-carbon anode material, a preparation method thereof, and an application thereof. The silicon-carbon anode material includes a porous carbon substrate, silicon elements distributed in the pores of the porous carbon substrate, and carbon coated on the outer surfaces of the porous carbon substrate and the silicon elements. The porous carbon substrate is prepared through two activation treatments, has dendritic pores, and satisfies at least one of the following a to f: a. The micropore volume ratio is 10 to 30%; b. The mesopore volume ratio is 60 to 90%; c. The macropore volume ratio is 0 to 10%; d. The specific surface area is not less than 200 m<supgt;2< / supgt> / g; e. The pore volume is not less than 0.4 cm<supgt;3 / g; f. The average particle size D50 is 1 to 20 μm. Through the activation treatment of the porous carbon substrate, the present invention can provide more buffer space for the volume expansion of nano-silicon particles from the perspective of substrate preparation, and significantly improve the cycle stability of the silicon-carbon anode 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 preparation method of a gradient graphitized glassy carbon coating, glassy carbon layers with different graphitization degrees are constructed by gradient induction of glassy carbon graphitization, graphene oxide (GO) can induce polyacrylonitrile graphitization in a heat treatment process, and the higher the GO content is within a certain range, the more obvious the induction effect is. According to the preparation method, 30% of GO dispersion liquid is added into bottom-layer polyacrylonitrile, so that a GO / polyacrylonitrile film can reach the graphitization degree of 90% or above at the temperature of 2400 DEG C, and the glassy carbon coating with good conductivity, corrosion resistance, wear resistance and impact resistance is prepared.

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.