906results about "Carbon nanotubes" patented technology

The invention belongs to the technical field of conductive carbon paste, and discloses a method for efficiently preparing single-walled carbon nanotube paste, which comprises the following steps of: 1, mixing single-walled carbon nanotube powder with a dispersing agent and a solvent, and dispersing the mixture into uniform carbon nanotube bundle paste in manners of mechanical stirring, emulsifying and the like; and step 2, enabling the uniform carbon nanotube bundle slurry to pass through different micropore channels for multiple times in a high-pressure environment, so that the carbon nanotube bundle slurry is dispersed into uniform single carbon nanotube slurry. Through a special high-pressure homogenizing channel, the adhered and wound single-walled carbon nanotube bundles can be dispersed into the slurry of the single single-walled carbon nanotubes on the premise of ensuring the lengths of the single-walled carbon nanotubes as much as possible. The uniform dispersion is realized, the tube diameter of the single-walled carbon nanotubes is relatively long, and the excellent conductivity of the slurry is ensured by the single single-walled carbon nanotubes and the microcosmic number of the single single-walled carbon nanotubes.

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

In order to solve the problems that an existing positive electrode material is unstable in structure and low in energy density, the invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium cobalt oxide of a layered structure, the chemical formula of the lithium cobalt oxide is Li < 1-alpha-beta > Na < alpha > (Mg < gamma > Ti < delta > Co < 1-gamma-delta >) O2, alpha is smaller than or equal to 0.005, and beta is 0.02-0.05; gamma is equal to 0.002 to 0.004, delta is equal to 0.001 to 0.003, and gamma + delta is equal to 0.003 to 0.006.

The invention discloses a method and a device for preparing a single-walled carbon nanotube based on the host-guest interaction of pillararene and metallocene. The method comprises the following steps: enabling a host compound and a guest compound to form a host-guest complex; the host compound comprises pillararene or a derivative thereof, and the guest compound comprises a cyclopentadienyl metal complex or a derivative thereof; the method comprises the following steps: reacting a mixed reaction system containing a host-guest compound and a polymerization inhibitor at a high temperature to obtain nano-scale catalyst particles; and contacting the nano-catalyst particles with a carbon source, and decomposing and growing the carbon source on the surfaces of the nano-catalyst particles to prepare the single-walled carbon nanotubes. The method disclosed by the invention is mainly based on the strong inclusion behavior of the host compound and the guest compound, and by utilizing the compatibility of the host compound, the solubility of the metallocene in an organic solvent is effectively improved, the decomposition time of the metallocene at high temperature is prolonged, and the in-situ controllable preparation of nano-scale catalyst particles is achieved; and furthermore, the yield and the quality of the single-walled carbon nanotubes are improved.

A mask-based testing system for detecting a biomarker received from lungs and airways of a test subject includes an exhaled breath condensate (EBC) collector integrated into an inside of a face mask worn by the test subject. The EBC collector converts breath vapor received from the lungs and airways of the test subject into a fluid biosample. A biosensor is fixed to the inside of the face mask for receiving a fluid biosample from the EBC collector and testing the fluid biosample for a target analyte. The biosensor generates a test signal dependent on at least the presence and absence of the target analyte in the fluid biosample. An electronic circuit is fixed to an outside of the mask for receiving the test signal, determining from the test signal a test result signal depending on detecting or not detecting the target analyte, and transmitting the test result signal to a remote receiver.

The invention relates to the technical field of control systems, and discloses a multi-zone cooperative control method and system for a temperature field of a carbon nanotube CVD growth furnace, and the method comprises the steps: obtaining the real-time temperatures of a plurality of temperature zones, and calculating the temperature deviation of each temperature zone; the actual temperature gradient is calculated, if the change rate of the actual temperature gradient exceeds a preset threshold value, the gradient maintaining deviation is calculated, and otherwise, the gradient maintaining deviation is zero; calculating a gain weight; calculating predictive thermal disturbance compensation amount of each temperature zone; calculating a first control item; the predictive thermal disturbance compensation amount forms a second control item; the gradient feed-forward correction value forms a third control item, and the gradient feed-forward correction value is proportional to the gradient maintenance deviation of the temperature zone; and taking the sum of the first control item, the second control item and the third control item as the power control quantity of the temperature zone. Unification and coordination of local temperature control and overall temperature are realized, a stable thermal environment is provided for growth of the carbon nanotubes, and consistency and uniformity of growth of the carbon nanotubes are improved.

The invention relates to the technical field of lithium battery negative electrode materials, and discloses a preparation method of a lithium battery silicon-carbon composite negative electrode material with high cycle stability, and the preparation method comprises the following steps: carrying out magnesiothermic reduction and acid etching on micron silicon powder and magnesium powder to prepare porous silicon particles; growing carbon nanotubes on the surfaces of the porous silicon particles and in pore channels in situ to construct a three-dimensional conductive network; styrene butadiene rubber and glucose are adopted as a composite carbon source to coat the product, and a composite carbon layer is formed through drying and gradient carbonization; and finally grinding and sieving the carbonized product. According to the preparation method disclosed by the invention, pores are constructed in micron silicon, and the micron silicon is externally coated with the composite carbon layer with flexibility and rigidity, so that the volume expansion of silicon is effectively buffered; the in-situ grown carbon nanotube network provides a stable electron conduction path; the micron-sized substrate reduces the specific surface area of the material and improves the first coulombic efficiency. Therefore, the prepared negative electrode material has high cycling stability and excellent rate capability.

The invention relates to the technical field of lithium ion batteries, in particular to a chromium-molybdenum double-doped lithium iron phosphate material as well as a preparation method and application thereof. The preparation method is used for solving the problems of low capacity, low electronic conductivity and poor cycling stability of the existing lithium iron phosphate material. According to the preparation method, chromium-molybdenum is doped into lithium iron phosphate, and the bond energy of a Cr-O bond and a Mo-O bond is stronger than that of a Fe-O bond, so that the dissolution loss of Fe < 2 + > in long-term circulation is reduced, and the battery capacity and the intrinsic electron conductivity of the material are improved; lithium iron phosphate is coated with nitrogen-doped carbon nanotubes, and nitrogen is doped in graphite crystal lattices of the carbon nanotubes, so that additional free electrons are provided, the intrinsic conductivity is improved, the resistance is reduced, the rate capability is improved, and the cycle life is prolonged; the polyaniline coating layer forms a barrier layer on the surface of the lithium iron phosphate particles, so that the cycle performance and the battery capacity are improved; the three components cooperate to improve the capacity, conductivity, rate capability and cycling stability of the material.

The invention relates to the technical field of preparation of single-walled carbon nanotubes, in particular to a chemical vapor deposition reactor, an FCCVD reaction device and a batch continuous preparation method of single-walled carbon nanotubes. By optimizing the structure of the reactor, the flow field in the reactor is further optimized, uniform distribution of gas is realized, and in-situ growth of catalyst particles and uniformity of the particle size are maintained. Results of the embodiment show that the reaction process is strengthened through optimization design of the reactor, batch continuous preparation of the single-walled carbon nanotubes can be achieved, the utilization efficiency of the catalyst is greatly improved, the yield of the unit catalyst is greatly improved, and the prepared SWCNT is high in quality.

A reactor including a vertically oriented vessel with a gas inlet port, a distributor, a feedstock port, and a microwave generator. The reactor is designed to process a carbon feedstock to produce hydrogen gas and a hydrogen deficient carbon product, utilizing a fluidized bed provided with microwave energy. Also disclosed are methods of converting a carbon feedstock, particularly a solid carbon feedstock, into hydrogen gas and a hydrogen deficient carbon product, preferably including carbon nanotubes.

The invention belongs to the technical field of material preparation, and particularly discloses a carbon nanotube purification method which comprises the following steps: mixing a carbon nanotube crude product with a solvent, and then shearing to obtain a pretreated carbon nanotube; and oxidizing the pretreated carbon nano tube, and then performing acid pickling to obtain the purified carbon nano tube. According to the purification method disclosed by the invention, shearing treatment is introduced to mechanically activate the carbon nanotubes, and is combined with subsequent oxidation and pickling processes to efficiently remove impurity carbon in the carbon nanotubes, so that the purification method is simple, remarkable in purification effect and high in purification efficiency, the purity of the carbon nanotubes can be greatly improved, the damage to the structure of the carbon nanotubes is small, and the method is suitable for industrial production. The method is suitable for large-scale industrial production.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

The invention discloses a single-walled carbon nanotube collecting device, which relates to the related technical field of carbon nanotube preparation, is used for collecting single-walled carbon nanotubes entering a deposition area of a tubular reactor, and comprises a collecting net arranged in the deposition area of the tubular reactor, the sealing flange close to the deposition area of the tubular reactor is connected with the end part of the tubular reactor in a screw joint manner, the collecting net is mounted on the sealing flange, a sealing ring is mounted at the axial end part of the sealing flange, and a first abutting surface is arranged in the tubular reactor; in the stroke that the sealing flange is inserted into the tubular reactor and rotates, the end of the sealing flange is matched with the first abutting face to extrude the sealing ring to generate elastic deformation, and the sealing ring subjected to elastic deformation is attached to the collecting net.

The invention discloses a preparation method and application of nickel-cobalt bimetallic phosphide for in-situ growth of nitrogen-doped carbon nanotubes. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; sequentially adding a cobalt source, a nickel source, a segmented copolymer, a phosphorus source and a nitrogen source into the graphene oxide dispersion liquid, and uniformly mixing to obtain a mixed solution; drying the mixed solution to obtain a precursor; and annealing the precursor in an inert atmosphere to obtain the product. According to the nitrogen-doped carbon material coated phosphide nano-particle composite material and the preparation method thereof, by regulating and controlling the ratio of Ni to Co, a carbon source grows on graphene in situ to form a carbon nano-tube, nickel-cobalt bimetal phosphide nano-particles are uniformly distributed on a nitrogen-doped carbon material to form the nitrogen-doped carbon material coated phosphide nano-particle composite material, and the nitrogen-doped carbon material coated phosphide nano-particle composite material is used as a modified diaphragm material of a lithium-sulfur battery. The preparation method disclosed by the invention has the advantages of mild reaction conditions and easiness in amplification and regulation, and the prepared composite material has a relatively high specific surface area and can be applied to the field of energy sources, especially the field of lithium-sulfur batteries.

An electrochemical cell is disclosed. The electrochemical cell may include a first electrode including carbon nanotubes and one or more catalysts formulated to accelerate one or more non-oxidative deprotonation reactions to produce at least one hydrocarbon compound, H+, and e− from at least one other hydrocarbon compound, a second electrode, and an electrolyte between the first electrode and the second electrode. The carbon nanotubes may be oriented at least substantially vertically relative to the electrolyte. Related methods and systems are disclosed.

FIELD OF THE INVENTION The present invention relates to a conductive agent, an electrode for a lithium battery, and a method for producing the conductive agent. The conductive agent comprises a dry mixture, preferably a freeze-dried mixture, of carbon nanostructures and carbon black.

A silicon-carbon composite material, and a preparation method therefor and a use thereof. The silicon-carbon composite material comprises a silicon-carbon composite particle; and the silicon-carbon composite particle comprises a carbon matrix and carbon nanotubes distributed in the carbon matrix, the tubes of the carbon nanotubes containing silicon nanowires.

The present invention provides a method for manufacturing a semiconductor device having a volume density defined by Equation 1 of 500 to 2500 / mm 3 The carbon nanotube composition of the present invention has excellent dispersibility and productivity because the carbon nanotubes in the carbon nanotube composition maintain a bundled structure and have a high bulk density.

The invention relates to the technical field of die steel materials, in particular to an injection molding die steel material and a preparation method thereof.The preparation method comprises the following steps that firstly, raw materials including, by weight, 0.3%-0.5% of C, 1.2%-1.5% of Mn, 3.3%-3.5% of Cr, 0.7%-0.9% of Si, 0.4%-0.5% of V, 0.1%-0.2% of Ni, 0.01%-0.03% of B and the balance Fe are weighed; according to the injection mold steel material, C, Mn, Cr, Si and other raw materials are blended, smelted, poured and formed, meanwhile, ultrasonic treatment of a synergistic solution is matched, solid solution, water cooling and tempering improvement treatment are carried out, the operation steps can homogenize the structure, stabilize the structure and optimize the toughness and other performance of a product, finally, homogenization treatment is carried out, and through continuous and coordinated improvement in the process, the product quality is improved. The fracture toughness, thermal conductivity and wear resistance of the obtained product are harmoniously improved, and the product is resistant to different degrees of corrosion stability.

The invention is suitable for the technical field of lithium ion battery materials, and discloses a silicon-carbon composite material and a preparation method thereof, a negative electrode plate, a lithium ion battery and application. The silicon-carbon composite material is of a core-shell structure and comprises an inner core and an outer shell, the inner core comprises porous carbon and a composite body deposited on the porous carbon, the composite body is composed of nanometer silicon, metal, a carbon nanotube and a heteroatom compound, and the shell comprises amorphous carbon; with the mass of the silicon-carbon composite material as the reference, the mass ratio of the shell is 1-5 wt%. According to the silicon-carbon composite material provided by the invention, the electronic and ionic conductivity is improved, the rate capability is improved, the expansion is reduced, and the cycle performance is improved.

Example embodiments include low-resistance positive electrodes, and rechargeable lithium batteries including the same. The positive electrode includes a positive electrode current collector, and a positive electrode active material layer on the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material in a concentration of about 95.5 wt % to about 99 wt %, a binder in a concentration of about 0.5 wt % to about 1.5 wt %, and a conductive material in a concentration of about 0.5 wt % to about 3 wt %. The conductive material includes nano-carbon particles and carbon nano-tubes. A weight ratio of the carbon nano-tubes to the nano-carbon particles is in a range of about 1.5 to about 3.5.

The invention belongs to the technical field of carbon nanotube dispersion, and particularly relates to a preparation method of a water-based single-walled carbon nanotube dispersion liquid. The preparation method comprises the following steps: adding a single-walled carbon nanotube into an organic solvent, uniformly stirring, carrying out dispersion treatment, adding a first surfactant into the obtained pretreated slurry A, uniformly stirring, carrying out ultrasonic dispersion to obtain slurry B, carrying out vacuum filtration on the slurry B, washing, and baking a collected filter cake to obtain the single-walled carbon nanotube composite material. The single-walled carbon nanotube C, a second surfactant and water are subjected to dispersion treatment, and the carbon nanotube adsorption material is obtained. The water-insoluble first surfactant is introduced to form a dry powder intermediate, so that secondary agglomeration is effectively inhibited, efficient and stable dispersion is realized while the structural integrity of the carbon nanotubes is maintained, and the preparation process is simple and suitable for industrial popularization and application.

The invention discloses a carbon nano tube for packaging M-NC single atoms and M3C nano particles as well as a preparation method and application of the carbon nano tube, and belongs to the field of composite materials and electrochemistry. The method comprises the following steps: preparing a mixed solution containing an organic ligand, a metal salt and a zinc salt; performing solvent heat treatment on the mixed solution to obtain a precursor; and mixing the precursor with dicyandiamide, and carrying out high-temperature heat treatment in an inert atmosphere to obtain a final product. According to the final product, the bamboo-shaped carbon nano tube is used as an outer frame, the packaged metal element M is wrapped in the outer frame of the carbon nano tube in the form of M-NC single atoms and M3C nano particles, and the metal element M is iron or cobalt. The product is low in cost, high in efficiency and good in stability when being used as an oxygen reduction electrocatalyst of a battery.

The application belongs to the field of carbon material preparation, and discloses a preparation method of self-supporting carbon nanotube and graphene hybrid material. The preparation method is as follows: two carbon sources with different carbon contents are added into a mixed solution of ethanol and water to form a suspension; the suspension is sprayed on the surface of a metal sheet, and after drying, the metal sheet is placed in a high-temperature furnace for high-temperature heating in a protective atmosphere; after the high-temperature furnace is cooled, the carbon material is taken off from the metal sheet, and then the carbon material is soaked in an acid solution, and then washed with water and dried to obtain the self-supporting carbon nanotube and graphene hybrid material. The method has the characteristics of simple operation, low cost, good product structure interconnection, and easy controllable macro preparation. The self-supporting carbon nanotube and graphene hybrid material can be used as a positive electrode carrier material of a lithium-sulfur battery.

The application relates to a method for removing conjugated polymer materials on the surface of carbon nanotubes, and belongs to the technical field of nanotube surface molecule removal. The method comprises the following steps: annealing treatment is performed on carbon nanotubes with conjugated polymer materials on the surface under a protective atmosphere, so that carbon-carbon double bonds formed between the main chain of the conjugated polymer materials and the carbon nanotubes during the preparation of the carbon nanotubes are broken, so as to remove part of the conjugated polymer materials; a solvent is used to perform rotary flushing on the carbon nanotubes subjected to the annealing treatment; and the flushed carbon nanotubes are subjected to annealing treatment again under a protective atmosphere. The method can ensure that the carbon-carbon double bonds formed between the main chain of the conjugated polymer materials and the carbon nanotubes during the preparation of the carbon nanotubes are broken, so that the effect of removing the conjugated polymer materials on the surface of the carbon nanotubes is achieved; the conjugated polymer materials on the surface of the carbon nanotubes can be removed completely, and the morphology of the carbon nanotubes is not damaged during the removal process.

Provided is a carbon nanotube that can improve safety and is suitably used for forming an electrode film having good conductivity. Another embodiment provides a carbon nanotube dispersion, an electrode composition, and a secondary battery containing the carbon nanotube. 【Solution means】It is solved by a carbon nanotube that satisfies the following (1) to (5). (1) In the Raman spectrum, when the maximum peak intensity in the range of 1560 to 1600 cm -1 is G, and the maximum peak intensity in the range of 1310 to 1350 cm -1 is D, the G / D ratio is 16 or more and 38 or less. (2) The BET specific surface area is 150 m 2 / g or more and 450 m 2 / g or less. (3) The volume resistivity is 1.0×10 -3 to 9.9×10 -3 Ω·cm. (4) The iron content is 7000 ppm or less. (5) The sulfur content exceeds 0 ppm and is 1600 ppm or less.

The application relates to the technical field of nanomaterial preparation, and particularly discloses a carbon nanotube preparation method based on carbon source and plasma time sequence cooperation and a carbon nanotube. In the gas phase deposition process, carbon source gas is input in a pulse mode, and a pulse type plasma is synchronously applied, wherein the carbon source input pulse and the plasma output pulse are time-differently matched, the carbon source supply window and the plasma action window form a non-fully-synchronized time sequence coupling relationship, the carbon source activation, transportation, deposition and structure reconstruction process are controlled in the time dimension, and meanwhile, the carbon source gas is introduced from a position close to the plasma action area to maintain the pulse opening and closing characteristics. The method can improve the growth selectivity of the carbon nanotube, reduce the defect density, and is suitable for controllable preparation of single-wall carbon nanotubes. The single-wall carbon nanotube with a semiconductor content greater than or equal to 83% can be prepared with high selectivity, and the product has the advantages of few defects, high purity and high yield.

The invention discloses a high-purity and low-damage single-walled carbon nanotube purification method which comprises the following steps: carrying out mechanical shearing treatment on a single-walled carbon nanotube to disperse the single-walled carbon nanotube and open a tube bundle structure to obtain a sheared single-walled carbon nanotube; carrying out pre-oxidation on the sheared single-walled carbon nanotube in a weak oxidizing atmosphere to obtain a pre-oxidized single-walled carbon nanotube; carrying out microwave treatment on the pre-oxidized single-walled carbon nanotube or the acidified single-walled carbon nanotube in an inert atmosphere to obtain a single-walled carbon nanotube subjected to microwave treatment; and acidizing the single-walled carbon nanotube subjected to microwave treatment to obtain the acidized single-walled carbon nanotube. The method is simple in process, mild in condition, easy to amplify and suitable for industrial production. The purity of the obtained single-walled carbon nanotube is higher than 99%, the raman spectrum IG / ID ratio is larger than 150 and higher than that before purification, and the single-walled carbon nanotube is high in structural integrity and suitable for the fields of high-performance composite materials, electronic devices, energy storage and the like.

Preferred embodiments provide a method for fabricating pyrolysed carbon nanostructures, the method comprises at least following steps: Providing a substrate, and then Depositing a polymeric material comprising either compounds with different plasma etch rates or compounds that can mask a plasma etching process, and then Subjecting said polymeric material to a plasma etching process (e.g. oxygen plasma) to form polymeric nanostructures and then Pyrolysing said polymeric nanostructures to form carbon nanostructures.

To provide a carbon nanotube (CNT)-containing powder for an electrode of a power storage device, which can exhibit excellent dispersibility in an electrode mixture of a power storage device, and a method for producing the same, and to provide a composite for an electrode of a power storage device and an electrode mixture paste for a power storage device, which can obtain an electrode for a power storage device having low volume resistivity by using the CNT-containing powder for an electrode, and an electrode for a power storage device and a power storage device using the electrode mixture paste. A CNT-containing powder for an electrode of a power storage device, including a carbon nanotube (CNT) and ethyl cellulose as a dispersant. The dispersant may be attached to the surface of the CNT. The CNT-containing powder for an electrode of a power storage device can be produced by kneading a CNT, a dispersant, and a solvent to prepare a paste-like kneaded product, and then drying the kneaded product to obtain a CNT-containing powder.