126results about "Multi-walled nanotubes" patented technology

The invention relates to the field of positive electrode materials, in particular to a carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, which are used for solving the core pain points that the lithium iron phosphate positive electrode material is low in electronic conductivity, slow in ion diffusion and easy to agglomerate particles in circulation. The carbon-coated lithium iron phosphate positive electrode material comprises a phosphorus-doped modified carbon nanotube, N-methyl pyrrolidone and lithium iron phosphate powder, the preparation method comprises the following steps: firstly, modifying a carbon nano tube by using a carbon nano tube modifier, then carrying out phosphorus doping to obtain a phosphorus-doped modified carbon nano tube, and then carrying out carbon coating treatment on lithium iron phosphate by using the phosphorus-doped modified carbon nano tube, the electron and ion transmission efficiency is remarkably improved, the high-rate discharge performance is optimized, the cycle stability is enhanced, and volume expansion and side reaction are inhibited.

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.

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

The present invention relates to an iron-free supported catalyst for the selective conversion of hydrocarbons to carbon nanotubes, said catalyst comprising cobalt and vanadium as active catalytic metals in any oxidation state on a catalyst support comprising aluminum oxide hydroxide, wherein the mass ratio of cobalt to vanadium is between 2 and 15, and the mass ratio of cobalt to aluminum is between 5.8 and 10. -2 ~5.8 10 -1 and - the mass ratio of vanadium to aluminum is 5.8 10 -3 ~8.7 10 -2 The present invention also relates to a method for producing said iron-free supported catalyst and a method for producing carbon nanotubes using said iron-free supported catalyst.

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.

Provided are a multiwalled carbon nanotube assembly having high conductivity and good dispersibility in a dispersion medium, a multiwalled carbon nanotube dispersion liquid, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film. A multi-walled carbon nanotube assembly, a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film, wherein the multi-walled carbon nanotube assembly contains Fe atoms and multi-walled carbon nanotubes having a maximum length of 1000-30000 [mu] m, and the Fe atom content ratio relative to the total mass of the assembly is 0.5 mass% or more but less than 10 mass%. The invention also provides a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film.

The application provides an in-situ oriented carbon nanotube / silicon nitride nanobelt composite material and a preparation method thereof, and comprises the following steps: uniformly mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, water and nitric acid according to a certain proportion, and obtaining a siloxane xerogel precursor after stirring and drying; obtaining a silicon nitride nanomaterial by a carbothermal reduction reaction method under high-temperature conditions; injecting a mixed solution of ethanol, ethylenediamine and ferrocene into a tube furnace by a floating CVD method under high-temperature conditions, and growing carbon nanotubes on the surface of the silicon nitride nanobelt to obtain the in-situ oriented carbon nanotube / silicon nitride nanobelt composite material; and the application grows the carbon nanotubes on the surface of the silicon nitride nanobelt material by the floating CVD method to improve the electromagnetic shielding performance of the silicon nitride nanocomposite material, and finally, the carbon nanotube / silicon nitride nanobelt composite material with light weight, flexibility and good electromagnetic shielding performance is prepared.

The present invention relates to an improved catalyst for MWCNT production. The present invention also relates to an iron-free supported catalyst for the selective conversion of hydrocarbons into carbon nanotubes, said catalyst comprising cobalt and vanadium as active catalytic metals in any oxidation state on a catalyst support comprising hydroxyl alumina, wherein: - the mass ratio of cobalt to vanadium is between 2 and 15; - the mass ratio of cobalt to aluminum is between 5.8 x 10 ‑2 and 5.8 x 10 ‑1 ; and - the mass ratio of vanadium to aluminum is between 5.8 x 10 ‑3 and 8.7 x 10 ‑2 . The present invention also relates to a method for the preparation of said iron-free supported catalyst and to a method for the preparation of carbon nanotubes using said iron-free supported catalyst.

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 disclosure provides a flexible electrode material, a flexible electrode, and their preparation methods and applications, belonging to the technical field of composite materials. The carbon microparticle composite material includes carbon particles and gallium oxide attached to the surface of the carbon microparticles. The flexible electrode material includes, by mass, 2-17 parts of gallium-coated carbon particles and 83-98 parts of liquid metal. The flexible electrode is prepared by coating the flexible electrode material onto a flexible substrate via screen printing, attaching copper conductive wires to both ends of the printed flexible electrode material, applying a viscoelastic material coating over the surface of the flexible electrode material, and curing and drying the flexible electrode material at room temperature. The composite material can be applied to electronic skin for detecting human body motion states and earth pressure cells for monitoring soil pressure in engineering projects.

The invention provides a method and device system for continuously producing carbon nanotubes, and the method comprises the following steps: (1) carrying out high-temperature gasification on a metal raw material in a protective gas atmosphere to obtain a metal steam mixture; (2) the metal steam mixture obtained in the step (1) is subjected to rapid quenching through an annular air knife, and metal nanoparticles or metal liquid drops are obtained; (3) mixing a carbon precursor, an accelerant, reducing gas and the metal nano-particles or the metal liquid drops obtained in the step (2) to react, and separating to obtain the carbon nano-tubes; wherein the temperature of high-temperature gasification in the step (1) is greater than or equal to 2200 DEG C; the cooling rate of the rapid quenching in the step (2) is greater than or equal to 1 * 10 < 4 > DEG C / s. The industrial mass production of the carbon nanotubes is realized, the yield and quality of the carbon nanotubes are considered, the carbon source conversion rate is increased, the number of layers of the carbon nanotube walls is accurately controlled, retention and blockage of side reaction products are avoided, the reaction continuity is improved, and large-scale popularization and application are facilitated.

In the present disclosure, a carbon nanotube capable of forming an electrode film having further improved safety and good conductivity, a method for purifying the same, a carbon nanotube dispersion containing the carbon nanotube, a binder composition, a composition for electrodes, and a secondary battery are provided.

One embodiment of the present disclosure provides a catalyst for manufacturing carbon nanotubes, including a metal component represented by the following Chemical Formula 1:         [Chemical Formula 1]     Cox:[M1, Zr]y:M2z wherein Co represents cobalt or oxides or derivatives thereof, M1 represents at least one metal, or oxides or derivatives thereof, selected from Al, Ca, Si, Ti, and Mg, Zr represents zirconium, or oxides or derivatives thereof, M2 represents at least one metal, or oxides or derivatives thereof, selected from W, V, Mn, and Mo, x / y satisfies 0.2 ≤ x / y ≤ 2.6, and x / z satisfies 6 ≤ x / z ≤ 13.

A high-performance lithium battery current collector and a conductive slurry, and preparation methods therefor. A functional coating of the current collector is a functional layered covering structure with a thickness of no more than 800 nm formed by coating a conductive slurry on a surface of a metal foil and drying. The functional coating includes a plurality of strip-shaped modified conductive agents, and after being cured and molded, the modified conductive agents are parallel to one another in the functional coating, axes of the modified conductive agents are arranged obliquely relative to a surface of the metal foil at an included angle of 15° to 45° within a thickness of the functional coating, and the modified conductive agents are interwoven with a modified nanofiber, a binder and the conductive agent in the coating.

Carbon-based composite materials are provided, such as those comprising at least 80 weight % of graphitic carbon comprising functional groups capable of forming hydrogen bonds, the graphitic carbon in the form of a mat of randomly entangled elongated structures; not more than 20 weight % of a polymer or a nanofiber thereof, dispersed within the graphitic carbon, the polymer or the nanofiber thereof comprising corresponding functional groups capable of forming hydrogen bonds with the functional groups of the graphitic carbon; and a plurality of hydrogen bonds at an interface formed between the graphitic carbon and the polymer or the nanofiber thereof, the plurality of hydrogen bonds formed between the functional groups of the graphitic carbon and the corresponding functional groups of the polymer or the nanofiber thereof.

A catalyst, catalyst precursor, and carbon nanotubes grown using the catalyst. The catalyst includes a support comprising alumina and a cobalt species on a surface of the support, wherein cobalt is the sole active catalyst species for carbon nanotube growth. The support surface is iron-free.

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 present invention relates to a titania-carbon-sulfur (TiO2-x-C-S) composite comprising a titania-carbon (TiO2-x-C) composite prepared by mixing cylindrical carbon materials and titania (TiO2-x), in which some oxygen is reduced, to have a structure in which cylindrical carbon materials are entangled and interconnected in three dimensions; and sulfur introduced into at least a part of the external surface and inside of the titania-carbon (TiO2-C) composite, and a method for preparing the same.

The application relates to the technical field of sodium ion battery negative electrode materials, in particular to a low-temperature-resistant hard carbon negative electrode material of a sodium ion battery and a preparation method thereof. The negative electrode material is prepared through the following operations: mixing an expanded carbon-based aqueous solution prepared from a cold-resistant gene plant and a carbon nanotube aqueous solution prepared from carbon nanotubes, adding zinc chloride, drying, high-temperature carbonization, acid pickling and the like. The negative electrode material is applied to a sodium ion battery, and the obtained sodium ion battery not only has excellent total battery capacity and ICE at room temperature, but also can maintain a relatively high total battery capacity and ICE at low temperature.

Embodiments of the present disclosure generally relate to methods of producing carbon-nitrogen allotrope nanomaterials. More specifically, the methods of the present disclosure utilize nitrogen-containing compounds as a feedstock for nitrogen doped carbon nanomaterial production. In some embodiments, a method for forming carbon-nitrogen nanomaterials includes mixing a nitrogen-rich feedstock, carbon-based feedstock, and a catalyst to form a feed solution. The method further includes injecting the feed solution into a carrier gas stream and into a heated reaction vessel. The heated reaction vessel includes a first zone and a second zone. The method further includes heating the feed solution within the first zone at a first temperature. The method further includes heating the feed solution within the second zone at a second temperature to form the carbon-nitrogen nanomaterials. The method further includes removing the carbon-nitrogen nanomaterials from the heated reaction vessel.

A positive electrode according to the present disclosure comprises a sulfur-based material in an amount of 65 wt% or more based on a total 100 wt% of a positive electrode active material layer and has a porosity of 80 vol%, and thus may be used to provide a lithium-sulfur battery with high energy density.

A nanostructured pellicle film is disclosed that is coated with an ultra-thin zirconium and formed by filtration. The nanostructured pellicle film includes a plurality of nanotubes that randomly intersect and form an interconnected network structure with a planar orientation that enhances properties, and a zirconium coating layer. The zirconium coating layer coated interconnected structure enables a high minimum EUV transmittance of at least 88%. The interconnected network structure has a thickness ranging from a lower limit of 3 nm to an upper limit of 100 nm, enabling effective EUV lithography processing.

Carbon nanotube (CNT) hybrid materials and methods of making such materials. A carbon nanotube (CNT) hybrid powder material includes a mesh of CNTs intimately interspersed with particles of a second material. In an example the material includes a blend that itself includes particles of a metal oxide supported catalyst and particles of a second material, and a mesh of CNTs is grown on the supported catalyst in the blend. The mesh of CNTs is effective to disperse the particles of the second material.

To provide a method for manufacturing carbon nanotubes and a carbon nanotube manufacturing device capable of manufacturing carbon nanotubes with a high yield. A first manufacturing device 100 mainly includes a mass flow controller 110, a growth furnace 120, a quartz tube 130, a pressure gauge 150, an electromagnetic valve 160, a pressure adjustment valve 170, and a needle valve 180. The quartz tube 130 is a cylindrical tube made of quartz, and is inserted into the growth furnace 120. The inside of the growth furnace 120 can be adjusted to a temperature suitable for the thermal decomposition temperature of each raw material resin. The pressure gauge 150 is connected to an outlet pipe 104 extending from an outlet end of the quartz tube 130. The electromagnetic valve 160 receives a pressure value from the pressure gauge 150, and opens / closes a pipe 106 according to the pressure value. The raw material resin 144 is placed near an inlet end of the growth furnace 120. A catalyst metal 142 is placed at a position separated by a predetermined distance from the inlet end of the growth furnace 120.

This invention provides an oxidized multi-walled carbon nanotube, its preparation method, and its applications, belonging to the fields of bioengineering and materials preparation technology. The invention synthesizes oxidized multi-walled carbon nanotube materials via an oxidation method. These materials have a porous three-dimensional structure composed of a sponge-like structure, and their surface possesses numerous carboxyl and hydroxyl functional groups. The surface area of ​​the oxidized multi-walled carbon nanotube material is 137-140 m². 2 / g, total pore volume is 0.45-0.50cm³ 3 / g, with a pore size of 13.30-13.40nm; the oxidized multi-walled carbon nanotubes can protect glucoamylase from thermal denaturation at 50-60℃ and can be reused multiple times. The oxidized multi-walled carbon nanotube material can efficiently immobilize GLL, with a maximum enzyme loading capacity of 211.28mg / g. The GLL enzyme activity of the immobilized enzyme is 4 times higher than that of the free GLL enzyme, which has good practicality.

A catalyst, catalyst precursor, and carbon nanotubes grown using die catalyst. The catalyst includes a. support comprising alumina and a cobalt species on a surface of the support, wherein cobalt is the sole active catalyst species for carbon nanotube growth. The support surface is iron-free.

The present disclosure relates to an apparatus and method for producing catalyst particles and high aspect ratio molecular structure networks. The apparatus 1000 includes a flow reactor 1100 and a laminar flow injector 1200 configured to introduce a catalyst particle precursor 1201 into the flow reactor 1100. The laminar flow injector 1200 includes a temperature controlled flow straightener 1210 disposed upstream of the flow reactor 1100.

The present application relates to a method for manufacturing a densified carbon structure-based film, the method comprising: a step for providing a carbon structure-based film; and a carbon structure-based film densification step for obtaining a densified carbon structure-based film by immersing the carbon structure-based film in a polar solvent and then in an acidic aqueous solution, or obtaining a densified carbon structure-based film by immersing the carbon structure-based film in an acidic aqueous solution and then in a polar solvent.

The present invention relates to a carbon nanotube dispersion exhibiting a low viscosity and a small change in viscosity over time, 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 90, the first dispersant being a dispersant comprising N atoms, the second dispersant being a dispersant comprising N atoms, and the dispersion medium being a dispersant comprising N atoms. The second dispersant is a compound containing a sulfo group, a hydroxyl group, and an aromatic ring in a molecular structure, and the carbon nanotubes and the dispersant are present in a weight ratio of 100: 25 to 500.