906 results about "Graphene coating" patented technology

The invention relates to a Graphene and carbon fiber-based composite material and a preparation method thereof. The composite material is prepared by taking the Graphene and the carbon fiber as raw materials, and coating a Graphene coating layer on the surface of the carbon fiber by a coating method, and the thickness of the coating layer is 1nm-5mum. The Graphene is taken as a surface coating material of the carbon fiber, and the Graphene and the carbon fiber are carbon materials and have high compatibility, thus Graphene solution coated on the surface of the carbon fiber can form the high-performance composite material and further improve the mechanical property, conductivity and heat resistance of the carbon fiber. The composite material has low cost, simple operation and strong applicability.

The invention provides a preparation method of ultraviolet-proof antistatic graphene coating textile fabric. The method is characterized by comprising the following steps: adding a graphene solution to a water-soluble polyurethane solution after shaking and dispersing so as to obtain a mixed solution; fully stirring the mixed solution; putting a graphene screening agent solution into a padder immersion tank; processing textile base fabric under room temperature through implementing a two-dipping and two-rolling procedure; padding the graphene screening agent on a textile, putting kinds of textiles on which the graphene screening agent is padded into a high-temperature oven for drying, wherein the temperature of the high-temperature oven is 75-95 DEG C; the high-temperature fixation time lasts for 5-30 minutes, so as to prepare the ultraviolet-proof antistatic graphene coating textile fabric. The method is simple in process, and easy to operate, and the yield is high; the produced textile fabric has the excellent function of preventing ultraviolet rays and static electricity.

The invention belongs to the technical field of materials and in particular relates to a graphene coating as well as a preparation method and a coating method thereof. The graphene coating is prepared from the components by weight: 5-95wt percent of less layer of grapheme, 5-95wt percent of adhesive, 0.01-50wt percent of dispersant and surfactant, 0.01-10wt percent of defoamer and the balance of solvent. With the adoption of the graphene coating, the thickness of an electricity and heat conductive coating can be controlled to be 100nm-20 microns; when the graphene coating is used on a plastic matrix, the volume resistivity can reach a range from 10<-2>ohm.cm to 10<-4>ohm.cm; while the graphene coating is used on a metal matrix, the volume resistivity can reach 10<-6>ohm.cm. The graphene coating can be applied to the metal surface so as to improve the cohesiveness, the electricity/heat conduction performance and the corrosion and oxidation resistance. When the graphene coating is coated on the plastic surface, the frictional resistance, the electricity and heat conduction performances and the static resistance can be lowered, and the graphene coating can be applied to the fields of printed circuits, electronic devices, radio frequency devices, touch screens, thin film solar energy, LEDs, magnetic shielding, radio frequency shielding and the like.

The present invention discloses an electroconductive particle comprising (a) a polymer microparticle, and (b) a graphene coating layer grafted on the polymer microparticle, which has improved long-term stability of the conductivity, surface conductivity, durability, and thermal resistance, and is applicable for producing an anisotropic conductive film used for packaging electronic devices.

The invention provides a three-dimensional graphene/metal line or metal wire composite structure and a preparation method thereof. According to the invention, metal lines or metal wires are adopted as a catalyst template; with a chemical vapor deposition method, a carbon source directly form graphene coatings on the outer surfaces of the metal lines, such that the graphene/metal line or metal wire composite structure is formed. The diameters of the metal lines or metal wires are 10nm-5000mum. The layer number of graphene is 1-100. The three-dimensional graphene/metal line or metal wire composite structure or graphene tube provided by the invention has excellent electric conductivity and corrosion resistance. The technology provided by the invention is simple, and the process is easy to control. The composite structure is advantaged in excellent electric conductivity and low preparation cost, and is suitable to be used in fields of solar energy devices, storage batteries, conductive composite materials, and corrosion resistance.

The invention discloses a preparation method of a graphene composite conductive fiber and relates to the technical field of graphene. The method comprises the following steps: processing a common textile polymer fiber with an organic solvent to remove impurities such as an oiling agent on the fiber surface; dipping the textile polymer fiber into an alkali liquor and an oxidized graphene solution, and enabling the fiber surface to fully contact the oxidized graphene; and dipping the dried fiber with an oxidized graphene coating into a solution containing a reducing agent to obtain the graphene composite conductive fiber. By adopting a simple dip coating method, the obtained composite fiber has mechanical property, high temperature resistance and flexibility performance of a traditional high polymer material and also has good conductivity. The method is easy to operate, environment-friendly and convenient to industrialize.

The invention discloses a preparation method and application of a polyaniline/titanium dioxide/graphene conductive composite membrane. The preparation method comprises the steps of: adding 3-60wt% of titanium dioxide, 0.05-5wt% of graphene and 0.6-10wt% of polyaniline into protonic acid solution, and adopting an in-situ polymerization method to obtain a polyaniline/titanium dioxide/graphene conductive composite; sequentially and evenly coating conductive resin and polyaniline/titanium dioxide/graphene coatings to matrixes such as polypropylene, glass slides, metal plates and the like, wherein each coating is 30-500mu m thick; and drying at 60-80 DEG C to obtain the needed product. According to the preparation method, the titanium dioxide is embedded in a conductive material to prepare the membrane, the defects that the nano TiO2 is not easy to recover and the quantum yield is low can be overcome, the separation efficiency of photoproduction electrons and cavities can be improved, the photoresponse range can be extended, and the photocatalytic efficiency can be improved.

The invention provides a chemical nickel-plating graphene preparation method and particularly provides a process method for improving the performance of graphene by nickeling the graphene. Chemical nickel-plating graphene is prepared by coarsening, sensitizing, activating, reducing, nickelizing and refining the graphene. A coating is added to the graphene by adopting a chemical nickel-plating technology. The preparation method is simple and can be used for continuous production. The prepared graphene coating is uniform in thickness and voidless and has a bright, clean and smooth surface.

The present invention provides a graphene coating-modified electrode plate for lithium secondary battery, characterized in that, the electrode plate comprises a current collector foil, graphene layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers. A graphene coating-modified electrode plate for lithium secondary battery according to the present invention comprises a current collector foil, graphene layers coated on both surfaces of the current collector foil, and electrode active material layers coated on the graphene layers. The graphene-modified electrode plate for lithium secondary battery thus obtained increases the electrical conductivity and dissipation functions of the electrode plate due to the better electrical conductivity and thermal conductivity of graphene. The present invention further provides a method for producing a graphene coating-modified electrode plate for lithium secondary battery.

The invention provides a graphene-coated glass fiber reinforced resin-based composite material. The preparation method comprises the following steps of dispersing graphene modified by a silane coupling agent in water to obtain a uniformly-dispersed aqueous dispersion, dipping glass fibers into the aqueous dispersion of the modified graphene so that compact and uniform graphene coatings are formed on surfaces of the glass fibers under the action of electrostatic adsorption, and carrying out compounding molding on the glass fibers with the graphene coatings and a resin matrix to obtain a composite material. The graphene coatings are arranged on the surfaces of the glass fibers so that the interaction area and interface bonding strength of the fibers and the matrix are improved, graphene dispersion is avoided and excellent composite material mechanical properties are obtained. The preparation method has simple processes, a low cost and good practicality.

The invention relates to a preparation method of a graphene coating polyacrylonitrile fiber composite material. The preparation method comprises the following steps of: (1) processing polyacrylonitrile by using alkali; (2) preparing a polyacrylonitrile fiber with modified single layer KH550; (3) preparing a polyacrylonitrile fiber with modified single layer graphite oxide; (4) using the polyacrylonitrile fiber with the modified single layer graphite oxide as a raw material, repeating the step (2) and the step (3), and obtaining the polyacrylonitrile fiber with modified multiplayer graphite oxide; and (5) placing the polyacrylonitrile fiber with the modified multiplayer graphite oxide in a graphite oxide dispersion liquid, then dropwise adding a hydrazine hydrate aqueous solution, carrying out heating reaction, finally cooling, washing and drying to obtain the graphene coating polyacrylonitrile fiber composite material. The preparation method provided by the invention is simple; the graphite of the composite material provided by the invention is good in reduction degree and uniformly coats the surface of the polyacrylonitrile; and compared with a commercial finished product, the composite material has the advantages that the resistivity of a single wire is reduced by six order of magnitudes, and the composite material has the application prospect of conductive fiber preparation.

The invention provides a negative pole material of a lithium ion battery and a preparation method of the material. The method comprises the following steps of: firstly mixing tin-dioxide hydrosol and a tetraethoxysilane absolute ethyl alcohol solution, adjusting the pH value to be at 10-13 after 0.5-2 hours, so as to obtain tin-dioxide nano particles coated with silicon dioxide, then mixing the tin-dioxide nano particles with an absolute ethyl alcohol solution containing a coupling agent and a titanium-containing compound, carrying out ageing after 1-6 hours, so as to obtain precipitates after 5-10 hours, cleaning with hydrofluoric acid, and finally mixing with graphene, drying and annealing so as to obtain the negative pole material of the lithium ion battery. The negative pole material comprises a tin dioxide nucleus, a titanium dioxide shell which is spaced from the tin dioxide nucleus by a hollow layer, and graphene coating on the titanium dioxide shell. The negative material provided by the invention has the advantages that in the charging and discharging processes, the volume change of tin dioxide can be effectively buffered; the titanium dioxide shell is coated by the graphene, so that the conductivity can be improved and the cycling performance of the negative pole material can be improved. The invention also provides the lithium ion battery.

At least one graphene layer is formed to laterally surround a tube so that the basal plane of each graphene layer is tangential to the local surface of the tube on which the graphene layer is formed. An electrically conductive path is provided around the tube for providing high conductivity electrical path provided by the basal plane of each graphene layer. The high conductivity path can be employed for high frequency applications such as coupling coils for wireless power transmission to overcome skin depth effects and proximity effects prevalent in high frequency alternating current paths.

The invention discloses a high-conductivity composite carbon fiber and a preparation method thereof, and belongs to composite carbon fibers and a preparation method thereof. The high-conductivity composite carbon fiber provided by the invention consists of carbon fibers as well as metal coatings and graphene coatings, which are sequentially adhered on the surfaces of the carbon fibers from bottom to top; the carbon fibers are carbon fiber yarns, carbon fiber bundles, carbon fiber cloth, carbon fiber paper or carbon fiber fabrics; the metal coatings are a metal copper coating, a metal nickel coating or a metal iridium coating; and the thicknesses of the metal coatings are 50-500nm. The composite carbon fiber prepared by the invention has excellent conductivity and heat conductivity, can conduct or dissipate lightning stroke energy rapidly, and improves the thunder stroke resistant capability of the carbon fiber material.

The invention provides a modified lithium nickel cobalt manganese oxide cathode material which comprises a lithium nickel cobalt manganese oxide material, LiMnPO4 combined on the surface of the lithium nickel cobalt manganese oxide material, and graphene combined on the surface of LiMnPO4. According to the invention, the lithium nickel cobalt manganese oxide material is modified through double combination, wherein a layer of LiMnPO4 coating the surfaces of particles can improve the interface stability of the material under a high cut-off voltage, and graphene coating at the outer layer can improve the electronic conductivity of the material and weak the polarization effect.

The invention relates to a method for electrochemically preparing a graphene/manganese dioxide composite material, and application of the graphene/manganese dioxide composite material, and belongs to the technical field of electrochemistry. The method comprises the following steps of: taking sodium carbonate as a supporting electrolyte; reducing a graphene oxide into graphene by a controlled potential electrolysis method, and uniformly fixing the graphene on a surface of an electrode; and precisely controlling the thickness of a graphene coating layer according to the concentration of the graphene oxide, potential, temperature and time during electro-deposition; respectively taking manganese acetate and sodium sulfate as a manganese precursor and a supporting electrolyte; adjusting the acidity of the electrolyte by sulfuric acid, performing controlled potential electrolysis, electrically depositing manganese dioxide on the surface of the graphene, and precisely controlling the particle size and the distribution density of the manganese dioxide; and repeating the operation for 100 times, and preparing the graphene/manganese dioxide composite material. Test shows that the obtained graphene/manganese dioxide composite material is an electrode or a super assembly capacitor, in which ionic liquid is used as the electrolyte; the capacity is more than 500 F/g; and after the super assembly capacitor is cyclically charged and discharged for 1,000 times, the capacity can still be kept over 99 percent.

The invention relates to a graphene coating aluminum foil coating machine. The machine comprises a base, and an aluminum foil coil, a front tension mechanism, a dust removing mechanism, a transmission mechanism, a vibration mechanism, a coating mechanism, a heating mechanism, a spraying mechanism, a drying mechanism, a back tension mechanism and a storage device arranged on the base; the dust removing mechanism, the transmission mechanism, the coating mechanism and the spraying mechanism are arranged rightly above the section of aluminum foil basal plate in a walking direction of the aluminum foil basal plate; the vibration mechanism and the heating mechanism are arranged below the section of aluminum foil basal plate; the vibration mechanism is perpendicular and corresponding to the coating mechanism and the spraying mechanism; and the heating mechanism is perpendicular and corresponding to the spraying mechanism. The machine is uniform in obtained product coatings, tight in contact with aluminum foil substrates, stable in performance, high in continuity of whole coating process and high in machining efficiency.

The invention discloses a cooling fin. The cooling fin comprises a base plate and a coating, wherein the coating is arranged on the base plate and is prepared from graphene solutions; the graphene solutions comprise the following components in parts by weight: 5-15 parts of graphene, 20-70 parts of adhesives, 0.25-0.6 part of dispersing agent, 0.05-0.3 part of surfactant, and 0.5-5 parts of antifoaming agents. According to the cooling fin, the graphene coating is coated on the surface of the base plate; by utilizing the extremely-high heat conductivity of the graphene, the surface transmission of the heat energy can be quickly carried out along a graphene film, and the heat energy is quickly transmitted to the inside of the cooling fin, so that the time for transferring the heat to the cooling fin from a heat-conductive interface material or a heating device is shortened, the cooling speed of the cooling fin is improved, and the temperature of the cooling device is reduced. In addition, the cooling fin is simple in preparation process and relatively low in production cost.

The invention discloses a preparation method and an application of a graphene-coated sulfur-selenium co-impregnated porous carbon positive electrode material. By adoption of a sulfur-selenium fusion co-impregnated process, and by virtue of a synergistic effect of sulfur and selenium and a synergistic effect generated by combination of excellent conductivity of selenium and high theoretical capacity of sulfur, generation of a shuttle flying reaction is effectively restrained, and a composite positive electrode material with high rate capability and high cycling stability is obtained; by virtue of a graphene coating layer, the sulfur content in the composite material can be increased while dissolution and dispersion of a polysulfide can be suppressed; due to a synergistic effect of the graphene coating layer and porous carbon, the material obtains excellent electrochemical performance; the reversible capacity can reach 680mAhg<-1> and 560mAhg<-1> at current density of 0.1C and 1C after 100 discharging cycles; and in addition, greater than 96% of coulombic efficiency is constantly maintained.

The invention provides a fabric with a doped-type graphene coating. The fabric is characterized in that the surface of the fabric is coated with doped-type graphene, and doped elements are non-metal elements. The fabric provided by the invention has the advantages that the catalytic, adsorbing and conducting characteristics of non-metal doped graphene are utilized, and the surface of the common fabric is coated with one layer of or multilayer non-metal doped graphene, so that the fabric has the characteristics of antisepsis, deodorization and dustproof, antifogging and antistatic effects; non-metal doped graphene of the coating has non-toxic and pollution-free effects and is easy to produce and manufacture; the preparation process is simple, and the fabric product is light and is high in practicability.