274results about "Single-walled nanotubes" patented technology

The invention provides an aerosol-assisted single-walled carbon nanotube preparation system and method, and relates to the field of single-walled carbon nanotube preparation. The system comprises a catalyst atomization unit, a catalyst screening unit, a chemical vapor deposition reaction unit and a collection unit, the catalyst screening unit is arranged at the joint of the catalyst atomization unit and the chemical vapor deposition reaction unit, and the collecting unit is connected to the tail end of the chemical vapor deposition reaction unit; the outer diameter of the catalyst screening unit is smaller than the outer diameter of the catalyst atomization unit and the outer diameter of the chemical vapor deposition reaction unit. According to the invention, the liquid catalyst is pre-atomized by using an aerosol atomization technology and then is screened, so that uniform small-particle-size catalyst particles can be obtained through sufficient vaporization more easily, the formation of large catalyst particles is effectively inhibited, the growth diameter of the single-walled carbon nanotube is effectively controlled, the formation of amorphous carbon is reduced, and the yield of the single-walled carbon nanotube is improved. And thus, the quality and purity of the single-walled carbon nanotube can be improved.

The invention provides a method for preparing a carbon nanotube with assistance of carbon dioxide, which is characterized in that methane is used as a carbon source, carbon dioxide is used as auxiliary gas, and the carbon nanotube is prepared under the action of a catalyst. Carbon deposition generated by using methane as carbon source gas is reduced by using carbon dioxide, and the quality and performance of single-wall, double-wall or three-wall carbon nanotubes are improved, so that application requirements are met.

The present invention discloses a graphene-coated lithium iron phosphate cathode material and a preparation method thereof, belonging to the technical field of lithium iron phosphate cathode materials. First, iron phosphate is loaded on graphene, and by controlling the pH adjustment time, small-particle-size FePO 4 / GO and large-particle-size FePO 4 / GO are accurately obtained. Iron phosphate is loaded on single-walled carbon nanotubes to prepare FePO 4 / SWCNT. Then, the loaded material and a lithium source are subjected to a pre-calcination reaction to grow and form graphene-coated lithium iron phosphate. Finally, dopamine is oxidized and self-polymerized to form polydopamine, which is coated on the outer layer of the graphene-coated lithium iron phosphate. After calcination and carbonization, a double coating of porous carbon material and graphene is formed. The particle size distribution of the prepared cathode material is optimized by using iron phosphate materials with different particle sizes and shapes to improve its tap density, and the conductivity is improved by graphene coating, endowing the cathode material with excellent electrochemical performance.

The invention discloses a method for purifying a carbon nano tube by using a deep eutectic solvent. The method comprises the following steps: drying carbon nanotube powder prepared on a supported catalyst by adopting a chemical vapor deposition method; the method comprises the following steps: mixing a hydrogen bond donor and a hydrogen bond acceptor according to a fixed molar ratio, and stirring at a set temperature to obtain a homogeneous eutectic solvent; adding the dried carbon nanotube powder into a deep-eutectic solvent, and dissolving the supported catalyst particles by regulating and controlling the temperature and the time; and carrying out vacuum filtration, cleaning and drying treatment on the reacted liquid to obtain the high-quality carbon nanotube. Compared with a traditional strong acid purification process, the method has the advantages of being simple, environmentally friendly, low in cost and the like, the intrinsic structure and surface characteristics of the carbon nanotubes can be effectively kept, and the method has important industrial application prospects.

The invention discloses a method for preparing a single-walled carbon nanotube, and belongs to the technical field of single-walled carbon nanotubes. When the single-walled carbon nanotube is prepared, the single-walled carbon nanotube is grown by using a chemical vapor deposition method; then, the grown single-walled carbon nanotubes are subjected to acid pickling, then, the carbon tubes are sorted and purified by adopting a polymer dispersant, and finally, the polymer dispersant is removed to obtain the single-walled carbon nanotubes; the polymer dispersant disclosed by the invention is obtained by reacting an aldehyde-terminated fluorenyl surfactant with diamino dipyridyl; wherein the aldehyde-terminated fluorenyl surfactant is obtained by polymerizing 9, 9-di-n-octylfluorene-2, 7-diboric acid di-pinacol ester and quaternary ammonium salt containing 2, 7-dibromofluorene, and then reacting with 5-formyl-2-thiopheneboronic acid pinacol ester for end capping; the prepared single-walled carbon nanotube is relatively high in purity and relatively high in finished product conversion rate.

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 present invention provides a carbon nanotube dispersion, a method for preparing the same, an electrode slurry composition comprising the carbon nanotube dispersion, and a secondary battery, the carbon nanotube dispersion comprising: carbon nanotubes; a first dispersant surrounding the surface of the carbon nanotubes; a second dispersant for introducing charges to the surfaces of the carbon nanotubes; and a storage stabilizer having an electrostatic repulsive force to the charge.

This invention relates to single-walled carbon nanotube films and methods and apparatus for their manufacture. This document discloses apparatus and methods for manufacturing large-diameter single-walled carbon nanotube films. Advantageously, large-diameter single-walled carbon nanotube films can be used as transparent electrodes with high transparency and low sheet resistance. In one embodiment, the method includes: supplying a support of carbon monoxide and a catalyst precursor through a first inlet at a temperature lower than the reaction temperature of the catalyst precursor; supplying heated carbon monoxide through a second inlet, such that the heated carbon monoxide is mixed with the support of carbon monoxide and the catalyst to form an aerosol; and reacting the aerosol in a reaction chamber to form a composite aerosol of single-walled carbon nanotubes, metal nanoparticles, carbon monoxide, and carbon dioxide. In this embodiment, the heated carbon monoxide heats the catalyst precursor, which reacts with the carbon monoxide to form carbon nanotubes.

This invention provides a carbon nanotube dispersion capable of achieving high electrical conductivity even with a small amount of carbon nanotube, and an electrically conductive material using the same. A carbon nanotube dispersion of the present invention contains a carbon nanotube, a dispersant, and a binder component. The carbon nanotube is preferably a single-walled carbon nanotube. The binder component is preferably an acrylic resin. An electrically conductive material of the present invention contains a carbon nanotube dispersion described above.

The invention discloses a continuous and stable preparation device and method for a single-walled carbon nanotube, and relates to the technical field of nanocarbon material preparation, the continuous and stable preparation device for the single-walled carbon nanotube structurally comprises hollow graphite, a graphite crucible, a plasma electric arc furnace body, an air inlet and a discharge port, the hollow graphite serves as a cathode of the plasma electric arc furnace, and the graphite crucible serves as an anode of the plasma electric arc furnace. The plasma arc is initiated between the graphite electrodes, so that the plasma high-temperature evaporation catalyst is fully utilized, the defect of arc striking of a graphite cathode and a liquid catalyst anode in a conventional method is avoided, the evaporation rate of the catalyst is reduced, and the problem of arc breaking caused by metal droplet sputtering and coking in the liquid electrodes is solved; a series of defects of a conventional scheme are avoided through the convex crucible anode, so that the continuous stability of the reaction is greatly improved, and stable and continuous preparation of the single-walled carbon nanotube is realized.

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.

A method for preparing carbon nanotubes according to an embodiment of the present invention comprises the steps of: injecting a carbon source, a metal catalyst, a co-catalyst, and a carrier gas into a reactor; and heating the reactor to prepare the carbon nanotubes. The ratio of the molar flow rate of the carbon source to the molar flow rate of the metal catalyst is 350 to 1300.

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 application discloses a method for converting a carbon nanotube aqueous dispersion into an organic dispersion. The method includes the steps of: providing a carbon nanotube aqueous dispersion; mixing the carbon nanotube aqueous dispersion with a first solvent containing a hydrophilic organic solvent to obtain a first suspension; mixing the first suspension with a second solvent containing a hydrophobic organic solvent to form two layered phases to obtain a second suspension; mixing the second suspension with a third solvent to obtain a third suspension; dispersing the second suspension or the third suspension to obtain a carbon nanotube organic dispersion, achieving solvent transfer of the carbon nanotubes, and achieving solvent transfer from the aqueous phase to the organic phase of the carbon nanotube dispersion. The method provided by the present application can convert a carbon nanotube aqueous dispersion into an organic dispersion, with a transfer efficiency of 70% to 95%.

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.

The invention provides a carbon nanotube purification method, which comprises: carrying out densification treatment on a carbon nanotube, and purifying the densified carbon nanotube at a temperature of 800-1400 DEG C by using ammonium chloride to obtain a purified carbon nanotube. According to the purification method provided by the invention, purification is carried out under the sub-high temperature condition of 800-1400 DEG C, the purification purity of the carbon nanotubes is high, and the content of metal impurities is low; pre-oxidation heat treatment is not needed, and the phenomenon that the structure of the carbon nano tube is damaged by high-temperature heat treatment at the temperature of 1700 DEG C or above is avoided; meanwhile, the purification efficiency is improved, and industrial amplification of the whole purification method is facilitated.

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.

Carbon nanotube (CNT) hybrid materials and methods for manufacturing such materials. The carbon nanotube (CNT) hybrid powder material comprises a CNT network in which particles of a second material are densely dispersed. In one example, the material comprises a blend of particles of a catalyst supported on a metal oxide and particles of a second material, and a CNT network grown on the supported catalyst within the blend. The CNT network is effective for dispersing the particles of the second material.

Part for a timepiece movement, made of a composite material comprising a rigid matrix and a forest of nanotubes contained in the rigid matrix.

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.

A carbon nanotube dispersion liquid includes carbon nanotubes (10) with an average fiber length of 10 µm or more, an aqueous solvent, and a dispersant (20) that is soluble in the aqueous solvent and has a weight-average molecular weight of 600000 or more. A content of the dispersant (20) is 10 parts by mass or more and 500 parts by mass or less relative to 100 parts by mass of the carbon nanotubes (10).

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 belongs to the technical field of nanotubes, and discloses a continuous preparation method and a reaction system for single-walled carbon nanotubes, the reaction system comprises a reaction furnace, a vacuum pump is arranged on the side wall of the reaction furnace, a gas pipe is arranged on the side wall of the reaction furnace on one side of the vacuum pump, and an anode feeding module and a cathode feeding module are arranged on the side wall of the reaction furnace above the vacuum pump. A pressure sensor is arranged in the reaction furnace, a first material receiving tank is arranged below the reaction furnace, the upper portion of the reaction furnace is connected with a first-stage cyclone separator through a guide pipe, a second material receiving tank is arranged below the first-stage cyclone separator, and the upper portion of the first-stage cyclone separator is connected with a second-stage cyclone separator through a guide pipe. A third material receiving tank is arranged below the second-stage cyclone separator, a fan is connected above the second-stage cyclone separator through a guide pipe, the outlet end of the fan is connected with the lower part of the reaction arc, and the first material receiving tank is positioned on the lower side of the outlet of the fan; the problem that continuous feeding and discharging cannot be achieved when the single-walled carbon nanotubes are prepared through an electric arc method is solved.

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.