599 results about "Graphene flake" patented technology

The invention relates to the technical field of packaging of power electronic devices, in particular to a three-dimensional packaged double-sided heat dissipation power module. The structure comprises an upper active metal brazing base material substrate and a lower active metal brazing base material substrate, a plurality of silicon carbide MOSFET chips, conductive strips and an inserter used for fixing the chips are arranged between the upper active metal brazing base material substrate and the lower active metal brazing base material substrate, the upper half-bridge chip is annularly arranged around a direct-current positive terminal, the lower half-bridge chip is annularly arranged around a direct-current negative terminal, and heat dissipation channels are formed in the upper surface and the lower surface of each chip. The impedance of branches is controlled to be equal, the current of each branch chip is balanced, the distance and layout of the chips are optimized, the overall loop area is reduced, the parasitic stray inductance of the module is reduced, in addition, the chips and the substrate are connected in a crimping mode, the chips and the copper columns are in contact through pressure to achieve electric heat conduction, the crimping materials are graphene sheets and molybdenum sheets, and the cost is low. Good contact between the chip and the copper columns is ensured, and contact resistance and thermal resistance are reduced. According to the invention, the effects of improving the heat dissipation efficiency, reducing parasitic stray inductance, balancing the current distribution of the parallel chips, and enhancing the module reliability and the conversion efficiency are achieved.

The invention discloses a calcining carbon removal-supercritical expansion stripping method for regenerating graphene from graphite of a waste lithium battery, and belongs to the field of lithium battery recovery and nano material preparation. Comprising the following steps: treating the waste lithium battery to obtain waste lithium battery positive and negative electrode mixed powder, and then roasting to obtain battery powder; leaching the battery powder in a nitric acid solution to obtain purified graphite slag; the method comprises the following steps: mixing graphite slag with supercritical gas fluid, treating, quickly releasing pressure to normal pressure, and separating to obtain graphene. According to the method, on the basis of interlayer structure characteristics of the waste graphite negative electrode, organic matters and amorphous carbon are removed through multi-stage calcination, a supercritical N2 / CO2 mixed fluid permeation and pressure relief expansion synergistic stripping technology is combined, and low-damage dissociation is achieved through graphite microcracks. According to the method, physical stripping and liquid nitrogen shock cooling strengthening are coupled, and the obtained graphene sheet layer is high in integrity and few in structural defect and can be directly used for manufacturing conductive composite materials and energy storage devices.

The invention relates to the technical field of dispersing agents, and particularly discloses a high-concentration water-based graphene dispersing agent. The high-concentration water-based graphene dispersing agent is prepared from the following raw materials in parts by weight: 25 to 30 parts of a modified nonionic surfactant, 8 to 12 parts of sodium lignin sulfonate, 0.4 to 0.8 part of a de-foaming agent and 90 to 100 parts of de-ionized water, the modified nonionic surfactant is prepared by the following steps: carrying out dehydration esterification reaction on 1-pyrene butyric acid and N-hydroxysuccinimide, carrying out nucleophilic substitution reaction on the obtained product and polyethylene glycol monododecyl ether to obtain modified 1-pyrene butyric acid, and finally polymerizing the modified 1-pyrene butyric acid and n-butyl acrylate. The method is easy to operate, graphene does not need to be subjected to oxidation reduction, the integrity of a graphene sheet layer can be completely kept, and the performance of the graphene can be fully exerted; the prepared graphene dispersing agent realizes efficient dispersing effect, excellent stability and environment-friendly safety characteristics, and provides solid technical support for wide application of graphene in multiple fields.

The invention provides a compressible high-thermal-conductivity graphene thermal interface material and a preparation method thereof. The preparation method comprises the following steps: preparing a graphene oxide film with low structural unit thickness by adopting a centrifugal spin-coating film casting method, performing limited thermal expansion delamination, compounding with polysiloxane, and performing directional lamination to obtain a highly-oriented graphene / organic silicon composite material. And applying shear stress after pressurizing and densifying along the normal direction of the graphene sheet layer, so that the graphene structure unit forms a continuous buckling structure which is high in density and easy to compress. The densification process promotes the interaction among delamination structure units, broadens a phonon transmission channel, inhibits phonon-boundary scattering, enhances the comprehensive heat-conducting property, plays a role in promoting stress transmission among graphene, and ensures the formation of a continuous buckling structure under shear stress. A continuous buckling structure and a relatively low structure unit thickness (llt in the graphene structure unit; and the compression modulus of the densified vertical graphene array is jointly reduced by means of high density, high thermal conductivity and high compressibility of an existing thermal interface material, and the method can be applied to the fields of new energy automobiles, high-power chips, aerospace electronic equipment and the like, and the problem that high density, high thermal conductivity and high compressibility of the existing thermal interface material are difficult to consider at the same time is solved.

The invention provides a lithium metal composite negative electrode, a preparation method thereof and a solid-state battery. The lithium metal composite negative electrode is of a three-layer structure and sequentially comprises a current collector, an active substance layer and a graphene space layer, the active substance layer is a lithium metal and / or lithium alloy layer, and the graphene space layer comprises three-dimensional graphene, lithium salt, a binder and a hydrophilic additive. In the space layer, the three-dimensional graphene is a novel carbon nanomaterial, the excellent characteristics of super-large specific surface area and super-high conductivity of the graphene are maintained, the pi-pi acting force between graphene sheet layers is overcome, the stability of a macrostructure is maintained, and the three-dimensional graphene serves as a space layer material to effectively store lithium ions and regulate and control lithium ion deposition; and the cycle and rate performance of the solid-state battery is improved.

The invention relates to the technical field of preparation of high-performance composite materials, and discloses a multilayer fabric laying method for improving interlayer bonding strength of a carbon fiber material, which comprises the following steps: step 1, selecting carbon nanotubes or graphene sheets as nanoparticles, carrying out chemical oxidation treatment to introduce functional groups, and carrying out functionalization treatment by using a silane coupling agent; step 2, mixing the functionalized nano particles with epoxy resin in a high-shear-force mixing device to form uniform nano reinforced resin; and 3, weaving the carbon fibers according to a predetermined three-dimensional structure mode by using a three-dimensional weaving machine, and monitoring the fiber tension and the weaving density in real time in the weaving process. By using nanoparticles to reinforce the composite material and carrying out chemical oxidation and coupling agent functionalization treatment, the interface adhesive force between the carbon fibers and the epoxy resin is improved, functional groups can form stronger chemical bonds with the resin, the interlaminar shear strength of the composite material is improved, and the overall structural integrity and durability of the material are enhanced.

The invention discloses a three-dimensional (SBC-HIE-FDTD) method for efficiently calculating the propagation characteristics of electromagnetic waves in a graphene dispersive medium on the basis of a mixed explicit-implicit finite difference time domain (HIE-FDTD) method and a surface boundary condition (SBC) of the graphene, and the three-dimensional SBC-HIE-FDTD method is used for efficiently calculating the propagation characteristics of the electromagnetic waves in the graphene dispersive medium. According to the three-dimensional SBC-HIE-FDTD method for efficiently calculating the electromagnetic field in the graphene dispersive medium, the advantages of the HIE-FDTD method in thin dielectric layer modeling and the advantages of the SBC method in the aspect of zero-thickness graphene sheet modeling are fused, so that the size of a small grid caused by a graphene sheet or a thin dielectric layer does not limit the time step length any more; compared with other simulation methods based on a graphene structure, the method has the advantages that the calculation efficiency is better, and the method is particularly suitable for analysis and simulation of radio wave propagation characteristics in a terahertz graphene absorber structure.

The invention relates to the technical field of lithium batteries, and discloses a silicon-based composite negative electrode material and a preparation method thereof, a lithium ion battery negative electrode plate and a lithium ion battery. The negative electrode material comprises a matrix, a carbon layer coated on the outer surface of the matrix and a graphene oxide sheet layer coated outside the carbon layer, the substrate is a silicon oxide SiOx, and 0 lt; xlt; 2; the weight ratio of the matrix to the carbon layer to the graphene oxide sheet layer is 1: (0.1-0.2): (0.2-0.3). The silicon oxide SiOx is coated on the substrate by the carbon layer, so that the direct contact between the substrate and an electrolyte can be reduced, the probability of side reaction can be reduced, the formation of a stable SEI interface and a graphene oxide sheet layer is facilitated, and the conductivity and cycling stability of the silicon-based composite negative electrode material can be improved; meanwhile, the lithium ion battery containing the silicon-based composite negative electrode material has a relatively low expansion rate, and the first-cycle coulombic efficiency and the cycle stability of the battery can be effectively improved.

Carbon composites, including carbon fibers, are disclosed and exhibit unique, advantageous mechanical properties, including inter laminar shear strength, compression strength, and resistance to forces applied at angles deviating from parallel to the longitudinal axis of the overall fiber. These improvements allow use of less material while conveying improved strength in myriad practical applications, reducing overall financial cost of fabrication, distribution, and practical utilization of resulting products. These advantages are optimized via utilizing inventive fabrication techniques that incorporate carbon filaments into carbon fibers, preferably incorporating carbon filaments including three-dimensional (3D) graphene platelets into said fibers. The filaments mechanically reinforce both individual fibers, as well as compositions including multiple fibers strung together in a single cord, by “crosslinking” the individual fibers with 3D graphene ligands. The combined result of these inventive efforts includes materials exhibiting superior mechanical strength and reduced mass relative to conventional carbon fibers.

An energy harvesting device is provided. The device includes a patterned graphene sheet arranged on a substrate, wherein the graphene sheet contains channels; a perovskite composition arranged on the graphene sheet, wherein the perovskite composition conforms to the channels of the graphene sheet; and a luminescent material composition or a 2D material composition arranged on the perovskite composition. The device is configured to convert electromagnetic radiation and / or thermal energy to an electrical signal.

The invention relates to an antistatic plastic film and a preparation method thereof, and belongs to the technical field of polymeric membrane materials, the antistatic plastic film is composed of a PET base film and an antistatic coating formed by curing an antistatic coating, the antistatic coating comprises the following components in parts by weight: 100 parts of organic silicon resin, 12-18 parts of an antistatic agent, 0.8-1.1 parts of a dispersing agent, 0.4-0.6 part of a bridging agent, 0.15-0.2 part of a flatting agent and 55-60 parts of a solvent, according to the antistatic agent, lamellar graphene is used as an electrostatic charge release matrix, a silane coupling agent KH-550 is used for introducing amino to the surface of a lamellar layer for modification, methyl chloroacetate and the amino grafted to the lamellar layer are used for substitution, finally, methyl iodide and a substituted amine compound are subjected to quaternization reaction, quaternary ammonium cations are introduced to the surface of the graphene lamellar layer, and the antistatic agent is obtained. And a continuous current collecting layer is formed in the coating, so that the generated electrostatic charge is timely led out, and the film material is endowed with excellent antistatic property.

A graphene-based thermally conductive film comprising a plurality of strips of a graphene film arranged so that graphene sheets of the graphene film are aligned in a direction perpendicular to the plane of the thermally conductive film, wherein the thermally conductive film comprises: a plurality of first area portions comprising strips of graphene film having a first rotational alignment in the plane of the thermally conductive film; and a plurality of second area portions comprising strips of graphene film having a second rotational alignment in the plane of the thermally conductive film, different from the first alignment.

The invention discloses a silicon carbide / graphene composite material and a preparation method thereof, the composite material is of a three-dimensional network structure generated through in-situ reaction of multilayer graphene and silicon powder, silicon carbide nanowires in the structure are distributed on graphene sheets, the length of the silicon carbide nanowires is 1-5 microns, the diameter of the silicon carbide nanowires is 50-100 nm, and the silicon carbide nanowires are in a beta-SiC crystal form. The material is prepared through a carbon thermal reduction method, specifically, silicon carbide nanowires grow on the surface of graphene in situ, so that electromagnetic parameters and impedance matching characteristics of the material are optimized. The prepared composite material has the characteristics of light weight, high specific surface area, good dielectric loss and the like, and shows good broadband wave-absorbing performance in the frequency band of 2-18 GHz, the minimum reflection loss can reach-23.535 dB, and the effective absorption bandwidth reaches 1.498 GHz. The method is simple in process, low in energy consumption and suitable for large-scale production, and has wide application prospects in the fields of stealth technology, electromagnetic shielding and the like.

The invention provides a lithium iron phosphate positive electrode material and a preparation method thereof, a positive electrode plate, a lithium ion battery and electric equipment, and relates to the technical field of new energy. The lithium iron phosphate positive electrode material disclosed by the invention has a unique secondary particle structure, a graphene conductive skeleton and a carbon coating layer, so that the powder resistance of particles can be greatly reduced, electron transmission in the material is facilitated, and the polarization effect is reduced. According to the preparation method of the lithium iron phosphate positive electrode material, two-fluid spray drying is adopted, graphene sheets already exist in spray solid spheres after spray drying, then carbon coating and nitrogen protection sintering are performed, and spherical lithium iron phosphate secondary particles with a graphene conductive framework and a carbon coating layer are obtained. Compared with the conventional lithium iron phosphate preparation method comprising a crushing step, the lithium iron phosphate preparation method has the advantages that the damage to the carbon coating layer in the crushing process is avoided, and the rate capability of the material is improved.

The invention discloses a graphene microchip dip-coating device for a PCB (Printed Circuit Board) substrate, and relates to the technical field of circuit board processing. Comprising a gantry moving frame, a plurality of treatment grooves and a mounting rod, and a plurality of clamping units distributed at equal intervals are arranged on the mounting rod; the clamping unit comprises a U-shaped frame which is erected on the mounting rod, the U-shaped frame is provided with a fixed clamping frame, the fixed clamping frame is fixedly connected with a positioning block and hinged to a movable clamping frame, and a supporting piece is fixedly connected to the side, close to the positioning block, of the movable clamping frame. The movable clamping frame is supported and limited through the supporting piece, when the base plate is clamped, the base plate only needs to be moved, the supporting piece is pushed through the base plate, the supporting piece relieves limiting of the movable clamping frame through the supporting piece, and then the base plate can be clamped and fixed, so that the step that all clamps are fastened one by one is omitted, and the clamping efficiency is improved. The probability that the substrate deflects during the clamp fastening process is reduced, the operation steps are simplified, and then the dip-coating and electroplating efficiency is improved.

The invention discloses a graphene oxide sheet long-afterglow material and a preparation method and application thereof.The preparation method of the graphene oxide sheet long-afterglow material comprises the steps that a graphite oxide electrode sheet serves as a working electrode, and the working electrode, a counter electrode and a reference electrode are immersed in electrolyte; direct current is applied through an electrochemical workstation, so that the voltage difference between the working electrode and the reference electrode is 1.8-2.0 V, an electrochemical reaction circuit is formed, electrochemical reaction is carried out until the current in a loop where the working electrode and the counter electrode are located is smaller than or equal to 1 mA, the electrochemical reaction is stopped, and the electrolyte is a saturated boric acid aqueous solution. According to the invention, through electrochemical intercalation and oxygen evolution reaction, the graphite oxide electrode plate is stripped from the graphene oxide sheet and is simultaneously compounded with the boric acid crystal in situ, so that the graphene oxide sheet long-afterglow material is directly obtained in one step, and the danger of a traditional method and the redundancy of multi-step preparation are eliminated.

The invention relates to a thermal insulation floor for a building and a preparation method thereof, and belongs to the technical field of composite floors. The heat preservation floor is composed of a base plate and a heat preservation coating on the surface, and the heat preservation coating is formed by curing a heat preservation coating and comprises, by weight, 100 parts of acrylic emulsion, 16-22 parts of microporous composite filler, 0.2-0.3 part of a wetting dispersant, 0.1-0.15 part of a flatting agent, 0.3-0.4 part of an anti-settling agent and 15-20 parts of a diluent. The microporous composite filler takes graphene oxide as a carrier, a porous silicon-magnesium-aluminum composite layer is formed on the surface and dispersed in the thermal insulation coating to form countless line-surface and surface-surface shielding protection structures, the heat conductivity coefficient of the coating is greatly reduced, the thermal insulation performance of the floor is improved, the graphene sheet layer of the core layer has excellent permeability resistance, and the thermal insulation performance of the floor is improved. The water absorption of the thermal insulation coating of the acrylic acid matrix is effectively reduced, the floor is effectively prevented from being affected with damp and rotting, and the service life of the floor is prolonged.

The invention discloses a high-temperature-corrosion-resistant stainless steel gas distribution disc and a preparation method thereof, and relates to the technical field of stainless steel machining, stainless steel is subjected to micro-arc oxidation treatment, the high temperature resistance and wear resistance of the surface of the stainless steel are improved, but the corrosion resistance of the stainless steel subjected to micropore treatment needs to be improved. Stainless steel subjected to micro-arc oxidation treatment is subjected to titanium dioxide layer plating treatment, micro-arc oxidation holes provide additional anchoring points, titanium dioxide layer plating treatment is carried out on the basis, the corrosion resistance of the stainless steel is improved, micro-arc oxidation treatment is firstly carried out on the surface of the stainless steel, then titanium dioxide is plated on the surface of the stainless steel, and the corrosion resistance of the stainless steel is improved. And the binding force between the titanium dioxide layer and the stainless steel substrate can be obviously improved. The graphene oxide-titanium dioxide composite sol is added into the electroplating solution, invasion of corrosive media is effectively blocked, the diffusion path of the corrosive media is prolonged through the graphene sheet layer, and the corrosion resistance of the stainless steel is further improved.

The invention discloses a double-layer structure composite material with rapid photo-thermal response and high anisotropic heat conductivity ratio and a preparation method and application thereof.Graphene sheets and thermoplastic polyurethane are compounded, a melt blending processing technology is combined, and a double-nozzle FDM 3D printing technology is utilized; and the high-heat-conductivity graphene-polyurethane layer is combined with the heat-insulating pure polyurethane layer to form an anisotropic heat conduction structure. The'heat conduction-heat insulation 'double-layer design has originality in the field of heat management, and the problem that efficient heat conduction and heat retention are difficult to consider by traditional materials is solved. The unique electronic energy band structure of the graphene enables the graphene to effectively absorb light energy in a wide spectral range, so that the prepared material can realize efficient and rapid photothermal conversion. In addition, compared with a traditional material processing mode, the FDM 3D printing technology has the advantages of being low in cost, easy to operate, diversified in material, free in design degree and the like, is suitable for large-scale industrial production and has wide application prospects.

The invention discloses a preparation method of chromium-free fingerprint-resistant liquid for an aluminized zinc plate, and relates to the technical field of metal surface treatment materials.The preparation method comprises the steps that a benzotriazole-cerium molybdate composite corrosion inhibition system is constructed, and multiple layers of adsorption films are formed through intermolecular pi-pi accumulation and rare earth ion coordination; meanwhile, a graphene oxide / nano silicon dioxide synergistic enhancement system is introduced, graphene sheet layers are directionally arranged to form a physical barrier, and micropores are filled with nano particles to improve compactness; and meanwhile, a lanthanide rare earth compound is adopted for modifying the flash-rust inhibitor, the stability of a passivation film on the metal surface is enhanced through the empty orbital characteristic of rare earth elements, the nanometer material gradient dispersion technology is combined with the ultrasonic-mechanical coupling dispersion technology, filler uniform distribution and interface bonding strengthening are achieved, and the fingerprint resistance, corrosion resistance and the like of the film layer are effectively guaranteed.

The invention discloses an electromagnetic shielding fabric and a preparation method thereof, and relates to the technical field of fabrics. The bismuth ion-doped polyimide is used as an external phase spinning solution, contains a large number of benzene ring structures, has a certain shielding effect on electromagnetism, does not generate radiation crosslinking and chemical degradation reactions after being subjected to high-energy radiation, and has a good electromagnetic shielding effect; then, carboxylated graphene oxide, barium ions and iron ions generate electrostatic adsorption, so that ferrite is loaded on a graphene sheet layer, a synergistic shielding effect is generated, the electromagnetic shielding effect of the fabric is improved, the graphene sheet layer serves as an inner phase, polyimide serves as an outer phase, gel fibers of a core-shell structure are prepared through spinning, a double-layer electromagnetic wave absorption path is constructed, and the electromagnetic shielding effect of the fabric is improved. Then under the reduction action of sodium borohydride, a layer of uniform metal bismuth is formed on the surface of the fiber, the electromagnetic shielding performance of the fabric is improved, then through drying, the gel on the inner layer forms a porous aerogel structure, the pores of the aerogel structure are communicated with the pores of the fiber, and the air permeability of the fabric is improved.

The invention discloses a graphene film / copper hot-pressing composite directional high-thermal-conductivity material as well as a preparation method and application of the graphene film / copper hot-pressing composite directional high-thermal-conductivity material. The preparation method comprises the following steps: punching a graphene film to form a plurality of hole structures; blade-coating copper paste on the surface to form a liquid film; the copper paste comprises copper powder, a coupling agent and an organic phase; stacking a plurality of layers; carrying out hot pressing treatment on the circulating laminated structure; and slicing to obtain the graphene film / copper hot-pressing composite oriented high-thermal-conductivity material. When copper powder particles are embedded into the hole structure, the whole hole structure is filled with the copper powder particles, the copper powder particles can transversely enter gaps between graphene sheet layers, a three-dimensional interlocking structure is formed through the sintering effect, resin contained in the copper paste can be subjected to a carbonization reaction in the glue discharging stage, a carbon skeleton is formed, and therefore the three-dimensional interlocking structure is formed. And the infiltration process between the copper powder and the graphene sheet layer is facilitated, and finally the heat conduction performance and the mechanical performance of the graphene film / copper hot-pressing composite oriented high-heat-conduction material are remarkably improved.

The invention relates to a method for growing graphene. The method comprises the following steps: removing impurities on the surface of a copper substrate by introducing a plasma oxidizing atmosphere; maintaining a plasma oxidizing atmosphere, and growing graphene on the surface of the copper substrate by adopting a chemical vapor deposition method; wherein a carbon source used for growing the graphene is a solid carbon source, and the solid carbon source can be obtained by mixing an aromatic compound and solid graphene. According to the method, impurities on the surface of copper can be efficiently removed by using plasma, the low-temperature graphene growth efficiency is improved, rapid cracking of a solid carbon source can be promoted, meanwhile, graphene powder or graphene sheets are introduced to serve as an adsorption carrier of aromatic compounds, the cracking speed can be effectively adjusted, and the graphene quality can be improved. According to the method, the graphene is grown on the copper connector by using the solid carbon source, so that the selection range of a graphene growth substrate is widened, and a wider development prospect is developed for a graphene and copper material combined product.

An automatic production system for a graphene heating tube comprises a punching forming device which comprises a die and a pressing plate located above the die, a cutting edge matched with a heating wire is arranged on the die, and a graphene sheet is pressed, cut and formed into the heating wire through downward pressing of the pressing plate; the electrode spot welding device receives the heating wire formed by the punching forming device and is used for welding electrodes at the two ends of the heating wire; the tube penetrating device comprises a guide tube, one end of the guide tube is driven to penetrate through the quartz tube, the heating wire on which the electrode is welded is clamped, and the heating wire is pulled into the quartz tube; the pressing and sealing device is used for heating and pressing and sealing the two ends of the quartz tube provided with the heating wire, so that the two ends of the quartz tube are changed into flat and airtight sealing structures; and the lamp holder mounting device is used for arranging the lamp holder on the quartz tube at the two ends of the quartz tube which is pressed and sealed through the lamp holder mounting device. After the scheme is adopted, full-automatic production of the graphene heating tube is realized, and the production efficiency is improved.

The invention discloses a high-energy-density self-supporting negative electrode, a negative electrode preparation method and a sodium ion battery, and relates to the technical field of sodium ion batteries, the high-energy-density self-supporting negative electrode comprises a plurality of self-supporting current collectors, and substrates of the self-supporting current collectors are composed of carbon nanofibers and graphene sheets; the carbon nanofibers form a three-dimensional network structure through electrostatic spinning; and the graphene sheets are inserted and embedded in the three-dimensional network structure to form a three-dimensional network structure. The negative electrode preparation method and the sodium ion battery are based on a high-energy-density self-supporting negative electrode. According to the preparation method, a three-dimensional network structure is constructed on the high-energy-density self-supporting negative electrode by using the carbon nanofibers and the graphene sheets, so that the adhesion area of the negative electrode substrate is increased, the purposes of increasing the active point locations of the negative electrode and improving the conductivity of the negative electrode are achieved, and a more stable self-supporting negative electrode preparation method can be obtained on the basis; and the sodium ion battery with more stable performance is obtained.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength bismaleimide resin material and a preparation method thereof. The bismaleimide resin composition comprises the following components in parts by weight: 50-60 parts of bismaleimide resin, 40-50 parts of an allyl compound, 1-3 parts of modified graphene and 0.1-0.5 part of a dispersing filler, the dispersing filler is prepared from modified inorganic nanoparticles and modified tetrapod-like zinc oxide whiskers in a mass ratio of (0.1-1): 1. Wherein the tetrapod-like zinc oxide whiskers can promote the dispersion of the graphene with a large lamellar structure from the macroscopic aspect, so that the graphene is uniformly dispersed in a bismaleimide resin matrix, and the inorganic nanoparticles can play a role in lubrication and isolation, so that the agglomeration among graphene lamellas in a small range is prevented. By adding the graphene composite reinforcing filler, the rigidity of the bismaleimide resin material is improved, and the toughness of the composite material can be improved at the same time.

The invention relates to a molecular dynamics simulation method for constructing graphene fibers by graphene sheets, and belongs to the technical field of graphene material simulation. A simulation model of graphene fibers is constructed by graphene sheets, and a virtual molecular dynamics simulation test is adopted to replace a traditional experimental process, so that the defects of an experiment in time and space scales are overcome. According to the method, through molecular dynamics simulation, the arrangement, combination and curling behaviors of graphene sheets in the fiber are deeply disclosed, and a theoretical basis is provided for optimizing the microstructure and performance of the graphene fiber.

The invention belongs to the technical field of electrode materials, and discloses an arene-synthesized graphene self-assembled porous carbon material and a preparation method and application thereof.The preparation method comprises the steps that 1, in the presence of protective gas, a solvent, a catalyst and optional fused salt, silicon dioxide aerogel serves as a template, arene serves as a reaction monomer, a reaction is conducted, and an arene-synthesized graphene self-assembled porous carbon material is obtained; a graphene self-assembled precursor material is obtained; and (2) carrying out carbonization treatment on the graphene self-assembled precursor material to obtain the arene synthesized graphene self-assembled porous carbon material. Aromatic hydrocarbon is combined with silicon-oxygen bonds on the surface of a silicon dioxide template, interaction of large pi bonds between graphene sheet layers is broken, and the problem that graphene materials are prone to stacking can be effectively solved; the graphene self-assembled porous carbon material prepared by the method is high in specific surface area, high in conductivity and excellent in capacitive performance.

The invention relates to the technical field of high polymer materials, and discloses a graphene-filled nylon high-thermal-conductivity composite material and a preparation method thereof, quaternary ammonium salt in a phosphorus-nitrogen quaternary ammonium salt polyamide structure can generate non-covalent bond combination with carboxyl and hydroxyl of graphene oxide through electrostatic interaction to realize grafting modification with graphene; the graphene is used as a filler to be filled into a nylon 6 matrix, and sheet layers of the graphene are overlapped together, so that a constructed heat conduction path is more complete, heat conduction is more continuous, and the heat conduction performance of the composite material is greatly improved; a triazine structure in the phosphorus-nitrogen polyamide modified graphene is decomposed at a high temperature to generate a nitrogen-containing compound which can promote carbonization of nylon 6, and a phosphoric acid structure is heated to form polyphosphoric acid which serves as an acid source and promotes carbonization; the graphene sheet layer can prevent the nylon material from deformation caused by external force, so that a skeleton supporting effect is achieved, and the mechanical property of the composite material is further improved.

The invention provides a negative pole piece, a secondary battery, an electric device and a hard carbon material.The negative pole piece comprises a negative current collector and a negative film layer located on at least one surface of the negative current collector, the negative film layer comprises the hard carbon material, and the hard carbon material comprises a graphene sheet layer; the space volume H1 between the graphene sheet layers with the interlayer spacing larger than 0.4 nm and the total space volume Htotal between the layers in the graphene sheet layers meet the condition that H1 / Htotal is larger than or equal to 40% and smaller than or equal to 60%. As a result, the dynamic performance and the first coulombic efficiency of the secondary battery can be achieved at the same time.