116results about "Single-walled nanotubes" patented technology

A carbon nanotube assembled wire includes a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes include a plurality of nitrogen-doped single-walled carbon nanotubes, a content ratio of nitrogen in the carbon nanotube assembled wire is 0.5 atomic % or more and 6 atomic % or less, and a content ratio of graphitic nitrogen in the carbon nanotube assembled wire is 0.4 atomic % or more and 3.5 atomic % or less.

The present disclosure provides an apparatus capable of continuously producing carbon nanotubes having high crystallinity, a low residual catalyst content and a high aspect ratio. The apparatus for producing carbon nanotubes includes: a reaction unit configured to synthesize carbon nanotubes (CNTs); a supply unit configured to supply a carbon source to the reaction unit through a supply pipe; and a collection unit configured to collect carbon nanotubes discharged from the reaction unit, wherein the reaction unit may include a chemical vapor deposition reactor.

To provide a manufacturing method of a conductive material slurry which facilitates pre-dispersion by reducing a particle size of a conductive material by introduction of a dry process, produces a high-concentration dispersion, and has excellent dispersion characteristics by introduction of a post-process, as compared with a conventional manufacturing method of a conductive material slurry.SOLUTION: A method of preparing a conductive material dispersed slurry includes: dry-grinding a conductive material; pre-dispersing the conductive material by mixing the conductive material with a solvent and a dispersant; main-dispersing the pre-dispersed conductive material; and post-dispersing the main-dispersed mixture.SELECTED DRAWING: Figure 1

To provide a fibrous carbon nanostructure that facilitates surface modification treatment.SOLUTION: In a fibrous carbon nanostructure, a half width of a peak of a temperature differential curve that is a primary differential curve of a thermogravimetric curve obtained by a thermogravimetric analysis in a dry air atmosphere is 38°C or higher and below than 90°C, and a high temperature side temperature at a height of one tenth of a peak top height of the peak is 658°C or higher.SELECTED DRAWING: Figure 1

The present invention relates to a carbon nanotube dispersion comprising carbon nanotubes, a dispersant and a dispersion medium, wherein the dispersant comprises a first dispersant and a second dispersant in a weight ratio of 100:10 to 100:115, the first dispersant is a dispersant comprising an N atom, the second dispersant comprises a compound comprising one aromatic ring and two or more hydroxyl groups in a molecular structure, and a weight ratio of the carbon nanotubes and the dispersant is 100:50 to 100:500, thereby having a small size of particles contained in the carbon nanotube dispersion.

To provide a carbon nanotube dispersion that offers superior dispersibility and long-term storage stability and enables improvement of secondary battery performance, a method of preparing the same, an electrode slurry composition and a secondary battery including the same.SOLUTION: A carbon nanotube dispersion comprises carbon nanotubes, a first dispersant that surrounds the surface of the carbon nanotubes, a second dispersant that introduces charges to the surface of the carbon nanotubes, and a storage stabilizer having electrostatic repulsion against the charges. A method for producing the carbon nanotube dispersion comprises steps of: preparing a mixture by mixing the carbon nanotubes, the first dispersant containing a nonionic polymer, the second dispersant containing an ionic polymer, the storage stabilizer containing a phenolic compound having two or more aromatic rings, and an aqueous solvent; milling the mixture to crush it; and dispersing the mixture.SELECTED DRAWING: None

The purpose of the present invention is to provide a carbon nanotube liquid dispersion that allows secondary battery electrodes to demonstrate a strong peel strength between an electrode mixture layer and a current collector formed from a metal, etc., and a weak peel strength for an electrode mixture layer provided with a release substrate made of a resin or the like, between the electrode mixture layer and the release substrate; and to allow a secondary battery to demonstrate superior rate performance, or realizes good film formation properties when a carbon film is formed. The carbon nanotube liquid dispersion according to the present invention contains carbon nanotubes and a solvent, wherein when a scattering curve obtained by the measurement conducted with ultra-small-angle X-ray scattering method is analyzed by the Beaucage model, the fractal dimension within a wavenumber range from 0.001 (1 / Å) to 0.3 (1 / Å) is in the range from 3 to 4.

The invention discloses a high-efficiency purification method of a single-walled carbon nanotube, which belongs to the technical field of nano material preparation and treatment, and comprises the following steps: pre-oxidizing an original single-walled carbon nanotube in an acidic potassium permanganate solution, and carrying out microwave liquid-phase selective heating treatment to promote a carbon shell wrapping a metal catalyst to break, so as to obtain the high-efficiency purification method of the single-walled carbon nanotube. Then, the exposed metal core is effectively dissolved through mixed acid pickling, and finally, the high-purity single-walled carbon nanotube is obtained through washing and drying. According to the method, through the synergistic effect of pre-oxidation and microwave heating, carbon-coated iron and other stubborn impurities are efficiently and deeply removed, meanwhile, the structural integrity of the carbon tubes is protected to the maximum extent, the problems that impurities are difficult to remove and the carbon tubes are prone to being damaged in a traditional acid pickling method are solved, and the method is suitable for industrial production. And the defects of harsh conditions and poor controllability of a high-temperature oxidation method are overcome, so that the final product has high purity, low structural defects and good dispersity, and the application requirements of the fields of high-end electronics, composite materials, energy storage and the like on high-performance carbon nanotube materials are met.

The present application relates to a negative electrode pre-dispersion liquid, a negative electrode composition containing the same, a negative electrode for a lithium secondary battery containing the negative electrode composition, a lithium secondary battery containing the negative electrode, and a method for producing the negative electrode composition.

The invention relates to the technical field of nano material preparation and electrochemical energy storage, in particular to a single-walled carbon nanotube and a preparation method thereof. According to the preparation method, a floating catalyst chemical vapor deposition (FCCVD) method is adopted, a compound of ferrocene and sublimed sulfur is used as a catalyst precursor, a horizontal tube furnace with at least three independent temperature zones is adopted, and a specific staged programmed heating strategy is adopted, so that the high-temperature-resistant and high-temperature-resistant catalyst is obtained. And the temperatures of the precursor sublimation area, the catalyst formation and activation area and the main growth area are accurately controlled in sequence. Wherein the temperature of the main growth region is accurately controlled at an optimal window of 1000 DEG C. The method effectively inhibits the generation of multi-walled carbon nanotubes and defect structures, and can stably prepare single-walled carbon nanotubes with high graphitization degree and less metal residues. The method is high in process controllability, and a reliable scheme is provided for large-scale preparation of the high-performance single-walled carbon nanotubes.

Provided are a carbon nanotube dispersion composition having high conductivity and good fluidity and storage stability and a non-aqueous electrolyte secondary battery having excellent rate characteristics and cycle characteristics by using an electrode composite material slurry and an electrode film using the composition. The carbon nanotube dispersion composition contains containing carbon nanotubes having an average outer diameter of 3 nm or less, a polymer component, and a solvent, in which the polymer component contains a polyvinylidene fluoride resin, which may have a substituent as a main component, and the carbon nanotube dispersion composition has a particle diameter D90 at 90% volume accumulation in the particle size distribution measured by laser diffraction method of 2.0 µm or more and less than 20.0 µm, and a pH of 7.5 or higher.

The present invention relates to a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby and, more specifically, to a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby, wherein the method enables not only the synthesis of a catalyst at a high rate through plasma generation without a separate reductant but also the continuous mass synthesis of high-purity carbon nanotubes. The technical essences of the present invention are a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby, the method comprising: a first step of supplying a CNT growth material containing a carbon precursor; a second step of disposing a pair of metal wires in a solution mixed with a metal salt, and applying electric power to the metal wires to generate plasma; and a third step of thermally treating the CNT growth material and the catalyst.

The invention discloses high-dispersion water-based single-walled carbon nanotube slurry and a preparation method thereof, and belongs to the technical field of carbon nanotube materials. The slurry is prepared from the following components in percentage by mass: 0.1%-5% of single-walled carbon nanotubes, 0.05%-2% of sodium carboxymethyl cellulose, 0.01%-1% of a viscosity reducer and the balance of water. By optimizing the molecular weight and the adding proportion of the sodium carboxymethyl cellulose and combining the synergistic effect of the specific type of viscosity reducer, the technical problems that the traditional water-based carbon nanotube slurry is poor in dispersity, too high in viscosity and insufficient in stability are solved. The preparation method adopts a step-by-step process of pre-dispersion, sanding dispersion, high-speed shearing dispersion, viscosity reduction adjustment, homogenization and curing, so that the single-walled carbon nanotubes can form a uniform and stable dispersion state in a water-based system, the slurry is free of obvious sedimentation after standing for 30 days, the viscosity is controlled at 500-5000 mPas, and the single-walled carbon nanotubes are suitable for the fields of conductive coatings, composite materials, electronic devices and the like and have wide application prospects. Wide application prospects are realized.

The present invention relates to a carbon nanotube dispersion comprising carbon nanotubes, a dispersant and a dispersion medium, wherein the dispersant comprises a first dispersant and a second dispersant in a weight ratio of 100:10 to 100:90, the first dispersant is a dispersant comprising an N atom, the second dispersant is a compound comprising a sulfonic acid group, a hydroxyl group and an aromatic ring in a molecular structure, and a weight ratio of the carbon nanotubes and the dispersant is 100:50 to 100:500, thereby having low viscosity and a little change in viscosity over time.

The present invention provides a nanotube array manufacturing method, a nanotube array, and a device, the method comprising the steps of: manufacturing a bilayer two-dimensional material having a relative include angle of lattice orientation on a substrate as a template; determining a chiral parameter of the nanotubes to be manufactured corresponding to the relative include angle of the lattice orientation of the bilayer two-dimensional material; determining a nanoribbon orientation and nanoribbon width based on the determined chiral parameter; determining a pitch between nanoribbons based on the density and nanoribbon width of the nanotubes to be manufactured; etching the bilayer two-dimensional material based on the determined nanoribbon orientation, nanoribbon width, and pitch between nanoribbons to obtain a nanoribbon array of the bilayer two-dimensional material; and thermally exciting the obtained nanotube array made of the bilayer two-dimensional material to obtain a nanotube array. The present invention can manufacture a nanotube array with controllable density, orientation, and chirality.

Provided are a carbon sheet having excellent performance in terms of inhibiting lithium dendrite growth and a method of producing this carbon sheet. Also provided are a laminate and an electrical storage device that include a carbon sheet having excellent performance in terms of inhibiting lithium dendrite growth. The carbon sheet is a carbon sheet containing carbon nanotubes, wherein the carbon nanotubes and the carbon sheet each have pores, and the distribution states of these pores satisfy specific requirements.

The invention belongs to the technical field of nano material preparation, and particularly relates to a continuous preparation method of an ultra-long carbon nano tube. The invention provides a continuous preparation method of an ultra-long carbon nanotube, which comprises the following steps: (1) introducing inert gas into a reactor, and heating to a reaction temperature; (2) introducing a mixed gas of a carbon source gas, hydrogen, an inert gas and water vapor into the reactor, and injecting a multi-component catalyst at the same time for growth of an ultra-long carbon nanotube; (3) after the growth is finished, cooling the reactor; wherein the reactor is a straight pipe reactor with the length of 5-110 m and the pipe diameter of 0.05-10 m or a spiral tubular reactor with the length of 2-50 m, the number of turns of 5-500, the small diameter of 0.04-0.5 m and the large diameter of 0.5-2 m, a feeding pipe with the length of 0.1-0.5 m and the pipe diameter of 0.01-0.1 m is arranged at a feeding port of the reactor, and no substrate is arranged in the reactor. According to the method, the super-long carbon nanotubes directly grow in the three-dimensional space in the reactor, and the yield is improved by at least ten millions of times compared with the yield reported in the past.

The present specification provides: a carbon nanotube dispersion liquid comprising single-walled carbon nanotubes (SWCNTs) having the purity of 95% or more and a cellulose-based dispersant, wherein the cellulose-based dispersant has the value of 7 or more and 13 or less calculated by mathematical formula 1; a method for preparing same; an electrode slurry composition comprising same; an electrode comprising same; and a lithium secondary battery comprising same.

The invention relates to the technical field of nano carbon materials, and particularly discloses a preparation method of single-walled carbon nanotube slurry, the single-walled carbon nanotube slurry and application thereof.The preparation method of the single-walled carbon nanotube slurry comprises the following steps that low-temperature plasma oxidation treatment is conducted on single-walled carbon nanotubes with the tube bundle diameter smaller than or equal to 100 nm and IG / ID larger than or equal to 50, meanwhile, mechanical shearing is conducted, and the single-walled carbon nanotubes with the tube bundle diameter smaller than or equal to 100 nm and IG / ID larger than or equal to 50 are obtained; dispersing in deionized water to obtain primary dispersion liquid of which the beam splitting index is greater than or equal to 0.80; mixing the primary dispersion liquid, a fluorine-containing surfactant, an amphiphilic ionic liquid and deionized water according to a mass ratio, performing high-pressure homogenization, and performing ultrasonic treatment to obtain a secondary dispersion liquid; and adding a pH response type polyelectrolyte into the secondary dispersion liquid, adjusting the pH value of the system to 6.5-8.0, and carrying out microjet homogenization to obtain the single-walled carbon nanotube slurry with the single-beam content of more than or equal to 70%, the viscosity of 500-5000 cP and D50 of less than or equal to 3 microns. According to the invention, on the premise of not introducing metal impurities and obvious structure defects, efficient beam splitting, long-term stable dispersion and batch consistency of the single-walled carbon nanotubes can be realized.

The application discloses a preparation method of a nanoscale multi-metal catalyst, which comprises the following steps: mixing ferric nitrate, magnesium nitrate, lanthanum nitrate, gadolinium nitrate, ammonium heptamolybdate and citric acid with water to obtain a concentrated solution by heating and concentrating; mixing ethylenediaminetetraacetic acid, ammonia water and urea to obtain an ethylenediaminetetraacetic acid solution; mixing the concentrated solution and the ethylenediaminetetraacetic acid solution to obtain a mixed solution by stirring, adding a surfactant into the mixed solution and calcining, and finally roasting. The ferric nitrate, the magnesium nitrate, the lanthanum nitrate and the gadolinium nitrate are mixed, a complexing agent is added, a solution is prepared by using a complexing method, the solution is concentrated, calcined and sieved, and finally the nanoscale multi-metal catalyst is formed. The catalyst prepared by the method has a uniform particle size. The catalyst prepared by the method is combined with a plasma technology to prepare a single-walled carbon nanotube, and the single-walled carbon nanotube (without treatment) has a high ratio, a large IG / ID and a small powder resistance.

The invention provides a preparation device of a single-walled carbon nanotube. The preparation device of the single-walled carbon nanotube comprises a hearth with an auxiliary heating system; the graphite crucible anode pool is mounted at the bottom of the inner wall of the hearth with the auxiliary heating system, and a fence is mounted at the top of the graphite crucible anode pool. According to the preparation device of the single-walled carbon nanotube, the graphite crucible anode pool is heated by the electric arc to form a stable high-temperature environment through the design, the problem of electric sparks caused by discontinuous electric arc is avoided, the temperature is maintained by a single electric arc gas in a conventional plasma method, and if a carbon source gas is introduced into a hearth, a flow field in a cavity is changed, so that the single-walled carbon nanotube is prepared. The arc striking gas is easy to be impacted and disordered, the metal anode pool is added, the stability of the temperature of the cavity is obviously improved, the safety and continuity of the reaction are greatly improved, and the fence is added around the graphite crucible anode pool, so that the problem that metal catalyst steam evaporated at high temperature is insufficiently contacted with a carbon source is avoided.

A carbon nanotube dispersion solution, a slurry for manufacturing an electrode containing carbon nanotubes, and a secondary battery fabricated using the same are provided. The performance of a secondary battery comprising carbon nanotubes can be improved by controlling the particle size and amount of the carbon nanotubes.

The invention relates to the technical field of carbon nanotube synthesis, and particularly discloses a method for preparing a single-walled carbon nanotube based on ethanol catalytic cracking. Comprising the following steps: S1, dissolving an iron salt catalyst and a sulfur source promoter in a solvent to form a catalyst precursor solution; s2, mixing ethanol with the catalyst precursor solution to obtain a reaction raw material solution; s3, carrying out atomization treatment on the reaction raw material solution to form aerosol; s4, introducing the aerosol into a high-temperature reaction furnace; s5, controlling the reaction temperature to grow a single-walled carbon nanotube, and cooling a reaction product to obtain a coarse single-walled carbon nanotube; s6, carrying out oxidation heat treatment on the thick single-walled carbon nanotube; and S7, carrying out acid pickling treatment on the single-walled carbon nanotubes, and removing catalyst residues to obtain the single-walled carbon nanotubes. The method for preparing the single-walled carbon nanotube can be used in the field of carbon nanotube synthesis, and has the advantages of few byproducts, high yield, high purity and few structural defects.

The purpose of the present invention is to provide: a carbon nanotube composition containing carbon nanotubes that are semiconductive and have a high chirality uniformity; a catalyst for manufacturing carbon nanotubes with which it is possible to produce carbon nanotubes that are semiconductive and have a high chirality uniformity; a method for manufacturing carbon nanotubes in which the catalyst is used; and carbon nanotubes manufactured using the manufacturing method.　This carbon nanotube composition contains a metal and carbon nanotubes, the metal containing Ni as well as Sn and / or Sb, and the carbon nanotubes being single-walled and semiconductive.

The invention discloses a non-metal doped iron-sulfur particle catalyst for synthesizing a single-walled carbon nanotube and a preparation method of the non-metal doped iron-sulfur particle catalyst, and belongs to the technical field of preparation of catalysts and carbon nanomaterials. According to the catalyst prepared by the invention, on the basis of a Fe-S system, trace non-metallic elements X (X = B, P, Cl and Se) are introduced for doping, and the catalyst is prepared by mechanical mixing, roll forming, crushing and screening. According to the catalyst, by means of the synergistic effect of non-metallic elements, Fe and S, the carbon source cracking efficiency is effectively improved, the carbon atom diffusion path is optimized, catalyst particles are stabilized, the catalytic activity is adjusted, and the yield and quality of the single-walled carbon nanotubes are synchronously improved. The prepared catalyst is simple in process, good in stability, high in catalytic activity, wide in application range and suitable for industrial production and large-scale preparation of high-performance single-walled carbon nanotubes, and the variety and content of active components or promoting auxiliaries in the catalyst can be flexibly adjusted according to actual requirements.

The invention provides electrically conductive films containing graphene nanoplatelets packed in a substantially Apollonian manner. The films may also comprise carbon nanotubes in order to improve their conductivity. The invention also provides liquid compositions that can be used to print the electrically conductive films described herein.

The present invention provides a liquid composition comprising conductive carbon particles and / or carbon nanoparticles, a thickener, and a solvent. The carbon nanoparticles are preferably a mixture of graphite nanoplatelets and carbon nanotubes, and the thickener is preferably a cellulose derivative. The liquid composition can be used as an ink for printing highly conductive films that adhere to paper substrates.

The proposed invention relates to the electrotechnical industry, more particularly to lithium-ion batteries, and even more particularly to lithium-ion batteries with silicon-containing anodes. The invention provides a method for preparing an anode paste, an anode paste, a method for preparing an anode for a lithium-ion battery, an anode for a lithium-ion battery, and a lithium-ion battery with a high initial specific capacity and many charge-discharge cycles while retaining at least 80% of the initial capacity. This technical result is achievable as a result of the presence of an anode material of bundles of single-walled and / or double-walled carbon nanotubes having lengths less than 5 μm, along with bundles of single-walled / double-walled carbon nanotubes having diameters greater than 500 nm and lengths greater than 10 μm.

The invention relates to an efficient dispersion preparation method for carbon nanotube slurry production, and belongs to the technical field of conductive slurry preparation. By precisely regulating and controlling a preparation process of a single-walled carbon nanotube and combining modification treatment of an acid mixed solution and a silane coupling agent, intrinsic characteristics of the carbon nanotube are optimized, agglomeration inherent driving force is weakened, and the conductivity of the conductive slurry is improved. Active functional groups are introduced, surface compatibility is improved, meanwhile, the conjugate structure and lattice integrity of the carbon nanotubes are effectively protected, structural defects are reduced, meanwhile, agglomeration is inhibited from the molecular level by means of the pi-pi stacking effect of the graphene quantum dots and the synergistic effect of the composite dispersing agent, and therefore the performance of the composite dispersing agent is improved. Then, by combining the graded breaking effect and the ultrasonic cavitation effect of gradient sanding, aggregates are gradually scattered from macroscopic to microscopic, and finally single-grade dispersion of the carbon nanotubes is realized, so that the dispersion uniformity of the slurry is greatly improved, and secondary agglomeration caused by desorption of a dispersing agent in long-term storage or subsequent processing is avoided.

Provided are a preparation method and continuous production system for single-walled carbon nanotubes. The preparation method for single-walled carbon nanotubes comprises the following steps: catalyst pretreatment: using a microwave plasma generator (4) to excite a catalyst to form nanoscale particles, then sequentially using gases having decreasing densities to perform gradient screening on the nanoscale catalyst particles, and forming a catalyst dispersion from the screened nanoscale catalyst particles together with a liquid carbon source and a promoter; and catalytic growth: atomizing the catalyst dispersion by means of an atomizer (5), then bringing the atomized catalyst dispersion into a reactor (6) by means of a carrier gas, and heating the reactor (6) to 1000-1500°C to grow single-walled carbon nanotubes. In the provided preparation method for single-walled carbon nanotubes, the microwave plasma generator (4) is used to excite the catalyst, so that the catalyst forms nanoscale particles, and gas screening is then performed on the nanoscale particles to obtain a catalyst having a smaller size and a narrower particle size, so that the purity of the finally obtained single-walled carbon nanotubes is high.