425 results about "Graphite composite" patented technology

The invention relates to the technical field of image processing, and discloses a graphite composite insulation board production process control method and system and a storage medium. The control method comprises the following steps: carrying out characteristic analysis and proportion optimization on raw materials to obtain pretreated raw materials; and monitoring the reaction state of the pretreated raw material, regulating process parameters, and generating a modified raw material. And performing formula optimization and performance prediction based on the material parameters of the modified raw material to obtain an optimized formula material. And forming process parameters of the optimized formula material are analyzed, a forming process is regulated and controlled, and a forming material is generated. And the curing process is optimized through the state parameters of the forming material, and a cured product is formed. And finally, evaluating the quality according to the detection data of the cured product, and generating a production control scheme. By establishing a multi-dimensional data acquisition and processing system, intelligent control over the whole production process is achieved, and therefore the stability and consistency of product quality are improved.

The invention provides anti-cracking and anti-seepage high-performance concrete, which relates to the technical field of concrete and comprises Portland cement, aggregate, a high-activity mineral admixture, a calcium-magnesium composite expanding agent, nano silicon dioxide particles, a microcapsule-packaged sodium silicate and calcium lactate solution, paraffin / expanded graphite composite phase change microspheres, steel fibers, PVA fibers and nano cellulose. The self-repairing concrete has the characteristics that the anti-cracking performance is comprehensively improved, the anti-seepage grade is broken through, the self-repairing capability is long-acting, the construction adaptability is enhanced, and the like.

The invention relates to a silicon-carbon composite material and a preparation method and application thereof.The preparation method comprises the steps that a porous graphite raw material is subjected to acid pickling and smashing to obtain pretreated porous graphite, then the pretreated porous graphite is soaked in a carbon precursor solution in a vacuum mode, carbonization treatment is conducted after centrifugal separation, pores of the porous graphite are filled with carbides, physical activation is conducted, and the silicon-carbon composite material is obtained; the preparation method comprises the following steps: forming pores in a carbide to form a graded pore structure to obtain a porous graphite composite material, then carrying out silicon deposition in a fluidized bed to obtain a uniform nano silicon layer, and then carrying out carbon coating treatment to obtain a silicon-carbon composite material; the graphite with relatively low cost is adopted as a matrix, high capacity and long cycle performance of the graphite-based silicon-carbon negative electrode material are realized through hierarchical pore structure design, carbonization-activation synergistic pore forming and interface deposition process optimization, and the graphite-based silicon-carbon negative electrode material can be applied to the fields of power batteries and high-energy-density energy storage, especially the field of lithium ion batteries and has wide application prospects. The expansion rate of the battery can be reduced, and the specific capacity, cycling stability and safety of the lithium ion battery can be improved.

The invention discloses a graphite composite material as well as a preparation method and application thereof, and belongs to the technical field of preparation of negative electrode materials. The graphite composite material has a core-shell structure, and the core of the core-shell structure comprises magnetic metal oxide doped porous graphite; and the shell of the core-shell structure comprises a carbon nanotube, a lithium supplement agent and amorphous carbon. The specific capacity is improved by doping the magnetic oxide in the porous graphite, and the carbon nanotube lithium supplement agent amorphous carbon is coated on the porous graphite, so that the energy density and the fast charging performance of the battery are improved.

The invention discloses a lithium salt doped porous carbon coated graphite composite material for an energy storage battery and a preparation method thereof, the composite material has a core-shell structure, the core is graphite, and the shell is a lithium salt doped porous carbon complex. The preparation method comprises the following steps: uniformly mixing amino resin, a pore-forming agent and a heteroatom compound of the pore-forming agent, curing, activating to obtain porous carbon, adding the porous carbon into an inorganic lithium salt, uniformly mixing, and carrying out spray drying to obtain lithium salt doped porous carbon; the preparation method comprises the following steps: adding lithium salt doped porous carbon into a carboxymethyl cellulose lithium solution, uniformly dispersing, then adding into a graphite material, uniformly dispersing, spray-drying, and carbonizing to obtain the lithium salt doped porous carbon coated graphite composite material. According to the obtained material, the coating layer lithium salt is doped with porous carbon, so that the liquid absorption and retention capacity of the material is improved, the diffusion rate of lithium ions is increased, and the rate capability is improved; meanwhile, the expansion of the composite material in the charging and discharging process is reduced by utilizing the low expansion of the porous carbon, and the cycle performance is improved.

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.

The invention discloses a silicon carbide power module packaging structure with low thermal resistance and low stress, and belongs to the technical field of semiconductor devices. The packaging structure comprises a metal substrate; the insulating ceramic layer is arranged on the metal substrate; the circuit layer is arranged on the insulating ceramic layer; the lower surface of the silicon carbide chip is connected with the circuit layer through a first interface layer; the composite heat dissipation stress buffer layer is arranged on the upper surface of the silicon carbide chip through a second interface layer; the copper clamp is connected with the upper surface of the composite heat dissipation stress buffer layer through a third interface layer; and the composite heat dissipation stress buffer layer is made of a copper-graphite composite material. According to the invention, the junction temperature of the silicon carbide chip can be greatly reduced, the overall thermal resistance is reduced, the surface stress of the chip is reduced, the warping phenomenon of the chip in the working process is effectively improved, and the long-life reliability of the power module under the long-term thermal cycle working condition is ensured.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention discloses a preparation method of a graphite composite bipolar plate, which comprises the processes of raw material homogenization, preheating treatment, hot press molding, demolding, stress relief and cutting and trimming, the raw material homogenization and stress relief processes can significantly improve the yield and product quality, and the problems of low yield, poor batch stability and the like in the prior art are solved; meanwhile, conductive fillers such as graphene, carbon fibers, carbon black, carbon nanotubes and metal fibers are introduced, so that a bridging effect among graphite particles is achieved, a conductive path is broken through, contact resistance is reduced, the overall conductivity of the bipolar plate is improved, the mechanical property of the material can be improved, and the service life of the bipolar plate is prolonged. Particularly, the bending strength is obviously improved; in addition, the method is simple in process, flexible to adjust, low in special equipment requirement, low in equipment investment and suitable for popularization.

The invention provides a graphite composite material, a preparation method thereof and a secondary battery, and relates to the technical field of lithium ion battery negative electrode materials. The graphite composite material comprises an inner core and a shell layer, the inner core comprises metal element doped metal oxide and graphite, the metal element doped metal oxide is embedded between sheet layers of the graphite, the shell layer comprises multi-walled carbon nanotubes and amorphous carbon, and the multi-walled carbon nanotubes are distributed in the amorphous carbon in a 3D net shape. According to the invention, by introducing the doping element, the lithium intercalation active sites of the metal oxide are increased, so that the lithium storage performance of the graphite composite material is improved; through the construction of a core-shell and intercalation structure, the volume expansion of the metal oxide is inhibited, so that the cycling stability of the graphite composite material is improved.

The invention discloses a porous carbon-coated graphite composite material for an energy storage battery and a preparation method of the porous carbon-coated graphite composite material. The porous carbon-coated graphite composite material consists of inner core graphite and lithium heteroatom-doped porous carbon coated on the surface of the inner core graphite, the preparation method comprises the following steps: preparing an organic template agent solution, adding resin and an amino organic lithium compound, uniformly mixing, adding a hydrogen peroxide oxidizing agent, reacting, filtering, and activating at high temperature to obtain lithium-doped porous carbon; the preparation method comprises the following steps: adding lithium-doped porous carbon into an organic solvent, then adding graphite and an organic aluminum-based compound, uniformly dispersing, dropwise adding an amino solution, carrying out chemical reaction at the temperature of 50-120 DEG C, filtering, and carrying out vacuum drying and high-temperature carbonization on obtained filter residues to obtain the lithium-doped porous carbon composite material. The cycle performance and the storage performance of the graphite can be improved.

The invention discloses a fast-charging low-temperature graphite composite material, a preparation method and application thereof, the composite material is of a core-shell structure, the core is porous graphite and a carbon nanotube doped with the porous graphite, and the shell is composed of a lithium supplement agent and a lithium sulfonate complex of the lithium supplement agent. The preparation method comprises the following steps: soaking porous graphite in a conductive polymer solution, adding a catalyst, a cross-linking agent and an oxidizing agent, carrying out oxidative polymerization and carbonization to obtain catalyst-doped porous graphite, and introducing carbon source gas through a vapor deposition method to obtain carbon nanotube-doped porous graphite; and adding the obtained material into a lithium sulfonate solution, adding a lithium supplement agent, uniformly mixing, and carrying out spray drying to obtain the graphite composite material. According to the obtained material, the electronic conductivity of the material is improved by using the carbon nanotubes grown on the inner core, and the lithium sulfonate coated on the outer shell has relatively strong solvation capability, so that the transmission rate of lithium ions is improved, and the rate capability is improved; meanwhile, the lithium supplement agent releases lithium ions in the charging and discharging process, the first efficiency is improved, and the low-temperature and fast-charging performance is improved.

The invention relates to a graphite composite material, a preparation method thereof, a negative electrode and a battery, the graphite composite material comprises a graphite inner core and a coating layer coating the graphite inner core, and the coating layer comprises porous carbon coating the graphite inner core and elemental phosphorus deposited in and on the surface of the porous carbon. The performance of a conventional graphite negative electrode is reduced during high-rate charging and discharging, and the compatibility with an electrolyte is limited; according to the invention, the surface of the graphite core is firstly coated with the porous carbon, and then the phosphorus is deposited on the surface and in the pores of the porous carbon coating layer, so that the defects in the prior art are overcome, and the cycling stability and rate capability of the graphite negative electrode are improved.

The invention belongs to the related technical field of carbon materials and batteries, and particularly relates to a preparation method of a carbon-coated graphite composite material, the carbon-coated graphite composite material and a battery negative electrode. A preparation method of a carbon-coated graphite composite material comprises the following steps: mixing an alkaline mixed solution containing a graphite material, a main carbon source for coating, a synergistic carbon source for coating and an auxiliary agent to obtain a dispersion liquid; performing drying and coking treatment on the dispersion liquid under a preset condition to form a carbon-coated graphite precursor; carrying out carbonization treatment on the carbon-coated graphite precursor under a protective gas environment condition to obtain a carbon-coated graphite composite material; the main carbon source for coating comprises saccharides; the synergistic carbon source for coating comprises a compound containing non-carbon heteroatoms; and the auxiliary agent comprises a surfactant, can be in synergistic effect with the synergistic carbon source for coating, and can fully disperse the alkaline mixed solution to obtain a uniformly distributed dispersion solution.

The invention belongs to the technical field of micro-nano composite materials, and particularly relates to a preparation method and application of a multi-metal sulfide-expanded graphite composite material. The preparation method of the multi-metal sulfide-expanded graphite composite material comprises the following steps: recovering graphite negative electrodes of waste lithium ion batteries, constructing cross-linked porous three-dimensional expanded graphite through a controllable expansion strategy, uniformly loading multi-metal sulfide nanoparticles on the surface of the expanded graphite by adopting a hydrothermal method, and carrying out heat treatment to obtain the composite material. The three-dimensional grid structure of the expanded graphite not only provides uniformly dispersed anchoring points for the polymetallic sulfide nanoparticles, but also constructs a continuous conductive network. According to the heterogeneous interface engineering, the charge transfer resistance is reduced, and agglomeration and volume expansion of active substances in circulation are inhibited through the topological confinement effect. The polymetallic sulfide-expanded graphite composite material prepared by the method has good structural stability and electrical conductivity, and the cycling stability of a battery can be remarkably improved when the polymetallic sulfide-expanded graphite composite material is used as a battery material.

The invention belongs to the field of lithium ion battery materials, and provides a composite coating coated graphite composite negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing a niobium pentoxide coated graphite precursor material; and (2) coating the niobium pentoxide coated graphite precursor material with a titanium dioxide coating by adopting a sol-gel method, and calcining to obtain the niobium pentoxide coated graphite composite material. According to the prepared composite coating coated graphite negative electrode material, the niobium pentoxide coating can reduce the interface impedance, and the titanium dioxide coating can ensure the stability of the structure. Therefore, the negative electrode not only has excellent rate capability, but also keeps excellent cycling stability, and the preparation method is simple and convenient.

The invention discloses a chloride ion battery for realizing bromine / chlorine synergistic chemistry and a preparation method thereof, and belongs to the technical field of redox batteries. The chloride ion battery takes graphite paper coated with vanadium pentoxide and graphite as a positive electrode, wherein the mass ratio of the vanadium pentoxide to the graphite is (0.5: 1)-(2: 1); zinc foil is used as a negative electrode, and an electrolyte is a mixed aqueous solution of tetramethylammonium chloride and lithium bromide. A double-halogen system of a V2O5-graphite composite positive electrode is adopted, chlorine species are chemically stabilized through the action of bromine, BrCl is generated in the charging process to inhibit Cl2 formation, and meanwhile, the intercalation energy barrier of chlorine is reduced; according to the salt-in-water electrolyte based on tetramethylammonium chloride, an electrochemical window is expanded to 3.0 V, and BrCl hydrolysis is effectively inhibited. The high-voltage halogen ion battery prepared by the method can realize a 2.3 V discharge platform, provides a specific capacity of 600mAh g <-1 >, has a capacity retention rate of 90% after 200 cycles, and opens up a safe development path for the high-voltage halogen ion battery without toxic gas emission. In addition, the battery system is simple in structure and has remarkable cost benefits.

The invention discloses an electroplated part, an electroplated part manufacturing method and a connector. The electroplated part comprises a base material; a nickel plating layer formed on the surface of the base material; the tin-graphite composite plating layer is formed on the nickel plating layer; the nickel plating layer is formed on the base material, the tin-graphite composite plating layer is formed on the nickel plating layer, the tin plating layer is formed on the tin-graphite composite plating layer, the nickel plating layer serves as a bottom plating layer of the base material, the tin plating layer serves as an outer plating layer of the base material, and the tin-graphite composite plating layer serves as a middle plating layer of the base material. According to the invention, the graphite particles exposed from the tin-graphite composite coating are partially or completely wrapped by the outermost tin coating, so that the graphite particles are not easy to fall off, the wear resistance and corrosion resistance of the electroplated part are improved, and the service life of the electroplated part is prolonged. In addition, the plating layer structure also has a relatively low friction coefficient, so that the insertion and extraction force of the electroplated part in the use process can be greatly reduced.

The invention belongs to the technical field of glass fibers, and discloses a glass fiber bundling wheel based on a graphite composite material and a preparation method of the glass fiber bundling wheel. The bundling wheel is made of a composite material comprising the following components: 50%-70% of polytetrafluoroethylene, 10%-25% of crystalline flake graphite, 1%-5% of antimony, 3%-10% of carbon nanotubes, 2%-8% of nano titanium dioxide and 5%-15% of chopped glass fibers; the preparation method comprises the following steps: mixing polytetrafluoroethylene, crystalline flake graphite, antimony, carbon nanotubes, nano titanium dioxide and chopped glass fibers step by step according to a ratio to obtain a mixed material; quantitatively weighing the mixed material, putting into a mold, carrying out hot press molding on the material by gradient pressurization and temperature increase, and then carrying out depressurization cooling to obtain a molded product; and polishing the surface of the formed product, and performing heat treatment to obtain the bundling wheel. According to the glass fiber bundling wheel, the bending strength, the impact strength and the abrasive resistance are effectively improved, the friction coefficient is reduced, zero particle falling can be achieved, the service life and the maintenance period are prolonged, and the production efficiency is improved.

The invention provides a graphite composite negative electrode material and a preparation method thereof, and a lithium ion battery, the graphite composite negative electrode material has a core-shell structure, and comprises a graphite core, a mesh conductive intermediate layer and a surface soft carbon coating layer; the raw materials of the net-shaped conductive middle layer comprise polyhydroxy benzene and metal salt, the raw material of the graphite inner core comprises natural graphite, and the raw material of the surface soft carbon coating layer comprises high-temperature coating asphalt; the mass ratio of the natural graphite to the polyhydroxy benzene to the metal salt to the high-temperature coated asphalt is 1000: (20-80): (20-80): (20-60). According to the invention, the natural graphite negative electrode material with high first-cycle coulombic efficiency, high rate capability and excellent long cycle performance can be prepared.

The invention relates to the technical field of valves, discloses a dry shaft type two-way sealing high-performance butterfly valve and aims to solve the problems that in the prior art, a valve rod is corroded and abraded, high-temperature and high-pressure sealing fails, and traditional dry shaft isolation is fragile. The three-eccentric butterfly valve is characterized by comprising a three-eccentric butterfly plate, an elastic metal valve seat and a main shaft isolation assembly. The elastic metal valve seat is composed of a corrugated spring ring and a stainless steel / flexible graphite composite sealing layer, and bidirectional zero leakage is achieved. The dry shaft isolation assembly comprises an isolation sleeve, an inner side dynamic sealing piece, a bearing assembly and a medium blocking cavity, and complete isolation of the valve rod and a medium is achieved. By the adoption of the technical scheme, long-term reliable dry shaft isolation and excellent two-way zero-leakage sealing performance can be achieved, and the maintenance cost is reduced.

The invention discloses a graphite composite material and a preparation method thereof and a lithium ion battery, and relates to the technical field of battery material preparation, and the preparation method of the graphite composite material comprises the following steps: obtaining amidated graphite, mixing the amidated graphite, lithium peroxide, a hydrogen peroxide solution and an organic acid reagent, and carrying out a cross-linking reaction to obtain an intermediate; and mixing the intermediate with a curing agent and asphalt, and sequentially carrying out curing reaction and carbonization reaction to obtain the graphite composite material. Wherein the amidated graphite is oxidized and crosslinked by two oxidants including lithium peroxide and a hydrogen peroxide solution under an acidic condition, and lithium ions dissociated from the lithium peroxide can enter interlamellar gaps of the graphite; the intermediate and the curing agent are further crosslinked to form a more complex three-dimensional network structure, and the surface of the graphite is coated with soft carbon through carbonization treatment, so that the stability, the first efficiency, the fast charging performance and the high-temperature performance of the graphite material are improved.

The invention discloses a preparation method of a graphite material coated with hydroxyl-terminated phenyl silicone resin as a hard carbon source. The method comprises the following steps: S1, oxidizing petroleum coke single particles, and generating oxygen-containing functional groups on the surfaces to obtain modified petroleum coke single particles; s2, the modified petroleum coke single particles react with terminal hydroxyl groups in hydroxyl-terminated phenyl silicone resin, so that the surfaces of the petroleum coke single particles are coated with the silicone resin, and a coated precursor is obtained; and S3, under the catalytic action of silicon atoms in the silicon resin, carrying out a graphitization process on the coated precursor at a relatively low temperature to form a hard carbon coated graphite core-shell structure. The hard carbon coated graphite composite material obtained by the preparation method has good morphology and particle size distribution, and the button cell prepared from the hard carbon coated graphite composite material has excellent cycle performance and rate capability. In addition, under the condition that no catalyst is added, the temperature required by the graphitization process is reduced through the catalytic graphitization effect of silicon atoms in the hydroxyl-terminated phenyl silicone resin, and the purpose of reducing the production cost is achieved.

The invention provides a metal graphite composite bipolar plate forming device. The metal graphite composite bipolar plate forming device solves the technical problem that according to an existing bipolar plate forming device, low-plasticity materials such as graphite and flexible graphite paper are prone to being locally fractured during stamping forming. The forming device is provided with a plurality of male die assemblies. The male die assembly is provided with a block punch, the block punch is provided with a miniature protrusion and a first blind hole, the first blind hole is provided with a hole edge, and a first spring is installed in the first blind hole. A plurality of longitudinal through holes are formed in the upper die plate from left to right at intervals, and each longitudinal through hole is provided with one male die assembly. A blocking punch is connected in the longitudinal through hole in a sliding manner; the base plate covers the longitudinal through hole, a first blocking part is arranged at the top end of the pressing rod, a rod body of the pressing rod penetrates through the second spring and the base plate to enter the longitudinal through hole, and a second blocking part is arranged at the bottom end of the pressing rod, connected with the first spring and clamped in the hole edge; the lengths of rod bodies of the pressing rods exposed out of the base plate are distributed in a stepped descending manner from left to right; the method can be widely applied to the technical field of fuel cell bipolar plate precision manufacturing.

The invention discloses a method for converting CO2 into a nitrogen-doped composite carbon material in one step by using molten salt, and belongs to the technical field of carbon material preparation and carbon dioxide resource utilization. The method disclosed by the invention comprises the following steps: S1, mixing LiCl, KCl, KOH and a nitrogen source to form a LiCl-KCl-KOH-nitrogen source system; s2, carrying out first heating and heat preservation on the LiCl-KCl-KOH-nitrogen source system in an inert atmosphere to remove moisture, then carrying out second heating to form molten salt, then introducing CO2 gas to generate carbonate ions, and meanwhile, carrying out electrolysis to obtain a cathode product; and S3, after the molten salt is slowly cooled, taking out a cathode product, and sequentially carrying out washing, vacuum drying and annealing to obtain the gradient nitrogen-doped multilevel structure graphite composite carbon material. The prepared material has multiple nano structures, high specific surface area and high nitrogen content, shows excellent rate capability and long cycle stability in electrochemical energy storage application, and has a wide application prospect.

The invention relates to a preparation process of a lithium ion composite battery negative electrode material with low impedance and high rate performance. The preparation method comprises the following steps: pretreatment of artificial graphite, preparation of hollow ferroferric oxide nanospheres (H-Fe3O4), preparation of disordered nitrogen-doped carbon-coated hollow ferroferric oxide nanospheres (H-Fe3O4 (at) NC), preparation of carbon-coated artificial graphite (Ag (at) C), preparation of a porous graphite composite material (PG (at) C (at) SEI for rapid charging, preparation of an artificial SEI high-conductivity porous graphite negative electrode material (PG (at) C (at) SEI), and construction of the composite negative electrode material (rGO (at) PG (at) C (at) SEI (at) H-Fe3O4 (at) NC). According to the preparation method, a high-temperature treatment method, a doping combination method, a carbonization combination method and an etching method are creatively combined, the prepared battery negative electrode material shows good impedance high-rate performance, and the charging and discharging efficiency and the cycling stability of a lithium ion battery can be effectively improved.

The invention discloses a preparation method of an electric brush silver plating-graphite composite coating, which comprises the following steps: 1) sequentially carrying out activation and electric purification pretreatment on a substrate, and then carrying out surface modification on the pretreated substrate by using a dispersing agent to obtain a surface-modified substrate; 2) setting a closed area for the surface-modified substrate; and (3) the closed area is subjected to silver pre-plating treatment, and a silver pre-plating base body is obtained. According to the invention, the problem that the graphite content in the plating layer is low when the voltage is high when the silver-graphite composite plating layer is plated by an electric brush is solved, so that the production efficiency is greatly improved.

The invention relates to a preparation method of manganous-manganic oxide / graphite nano-enzyme for sensitive detection of L-cysteine, a green synthesis strategy is adopted, a mechanochemical method is combined to develop a novel Mn3O4 / graphite composite material which is low in cost, high in activity and easy to synthesize in macroscopic quantity, and the prepared product has relatively high catalytic activity and can be applied to the detection of L-cysteine. Compared with the prior art, the method has the advantages that oxidase-like activity is obviously improved, the Michaelis constant Km is 0.132, the maximum reaction rate Vmax is 0.998 * 10 <-7 > M <-1 > s, high-sensitivity and visual analysis and detection of L-Cys can be realized at normal temperature, the detection interval is 1-40 [mu] mol / L, and the detection limit is 0.361 [mu] mol / L.

The utility model discloses production equipment for a heat-conducting graphite composite film, which can solve the problem of layering in subsequent die cutting caused by surface powder falling after a supercrystal graphite film is calendered. In addition, the utility model also discloses a heat dissipation product manufactured by the production equipment. The heat-conducting graphite film production equipment comprises a first laminating device, a pressing device, a die cutting device, a second laminating device and a third laminating device which are sequentially arranged along the conveying direction of a super-crystal graphite film, the first laminating device is used for laminating a calendering release film on the upper surface of the super-crystal graphite film and carrying out calendering treatment on the laminated super-crystal graphite film, and the pressing device is used for re-pressing the upper surface of the super-crystal graphite film from which the calendering release film is removed and laminating a low-viscosity protective film on the lower surface of the super-crystal graphite film; the die cutting device conducts die cutting on the film material output by the pressing device, the second attaching device attaches the double-faced adhesive tape with the release film to the upper surface of the super-crystal graphite film, and the third attaching device attaches the insulating film to the lower surface of the super-crystal graphite film.

The utility model relates to the technical field of batteries, in particular to a direct cooling plate assembly and a power battery. The direct cooling plate assembly comprises a direct cooling plate and a graphite composite soaking film, a refrigerant flow channel is distributed in the direct cooling plate for refrigerant circulation, the graphite composite soaking film is laid on the surface of one side of the direct cooling plate, and the direct cooling plate is attached to the battery module through the graphite composite soaking film. When the temperature of the battery module rises, the heat of the battery module can be transferred to the direct cooling plate through the graphite composite soaking film, so that the refrigerant is subjected to phase change to absorb a large amount of heat, and the quick cooling of the battery module is realized. Meanwhile, the graphite composite soaking film has a high heat conductivity coefficient in the plane direction and has a good temperature uniformizing effect, so that the consistency of the surface temperature of the direct cooling plate is effectively improved, the temperature difference between battery cells of the battery module is reduced, the temperature consistency of the battery module is improved while efficient heat dissipation of the battery module is achieved, and the service life of the battery module is prolonged. The use safety and the cycle life of the battery module are improved.