331 results about "Graphite composite" patented technology

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 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 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 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 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 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 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 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 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 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 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.

The invention provides a SnO2 / expanded graphite composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and aims to solve the technical problems of low specific capacity of expanded graphite and unstable SnO2 cycle performance. The preparation method of the SnO2 / expanded graphite composite material comprises the following steps: (1) mixing expandable graphite, soluble tin salt and a solvent to obtain a mixed solution; (2) evaporating the mixed solution to dryness to obtain a graphite intercalation compound; and (3) carrying out microwave heating on the graphite intercalation compound to obtain the SnO2 / expanded graphite composite material. The SnO2 / expanded graphite composite material prepared by the invention is used as a sodium-ion battery negative electrode material, can effectively overcome the defect of poor capacity when a carbon material is independently used and the defects of low conductivity and poor cycle performance when SnO2 is independently used, can synergistically exert the sodium storage advantages of the metal oxide and the expanded graphite, makes up the respective defects, and can be used for preparing the sodium-ion battery negative electrode material. Therefore, the electrochemical performance of the sodium-ion battery is improved.

The present invention relates to a fast ion conductor coated graphite composite material and a preparation method thereof. A fast ion conductor coated graphite composite material comprises an inner core and an outer shell coating the inner core; wherein the inner core is graphite; the outer shell is a double-layer structure, the inner layer is a first coating layer containing a fast ion conductor; the outer layer is a second coating layer, which is nitrogen-containing amorphous carbon. The present invention also discloses a preparation method of the graphite composite material. The fast ion conductor coated graphite composite material and the preparation method thereof described in the present invention utilize the synergistic effect between the first coating layer and the second coating layer, namely, the fast ion conductor has high lithium ion conductivity and stable structure, and the second coating layer has high electronic conductivity. At the same time, the first coating layer and the second coating layer are connected by a coupling agent to enhance the bonding force between the materials, reduce the impedance between the layers, and enhance the cycle performance and power performance.

The invention relates to the technical field of lithium ion battery manufacturing, and discloses a preparation method of a silicon-containing silicon oxide-phenolic resin-artificial graphite composite negative electrode material, which comprises the following steps: grafting phytic acid on the surface of silicon-containing silicon oxide to construct a protonated acidic site, mixing modified silicon-containing silicon oxide, phenolic resin and artificial graphite, and keeping at a constant temperature to obtain the silicon-containing silicon oxide-phenolic resin-artificial graphite composite negative electrode material. Preferentially carrying out pre-polycondensation by utilizing phytic acid catalysis interface resin to form a gel layer, and rapidly removing a solvent to obtain a precursor; according to the preparation method disclosed by the invention, interface chemical anchoring is established before solvent volatilization by utilizing a dynamic competitive mechanism, so that the problem of stripping of resin and active particles caused by solvent volatilization in a traditional process is solved, and the structural stability and the electric conduction continuity of the material in a battery circulation process are improved.

The invention provides a high-capacity fast-filling graphite composite negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: by taking anthracite and needle coke mixed micro powder as a raw material, pre-carbonizing the mixed raw material, and then physically activating by taking water vapor or carbon dioxide as an activating agent to prepare a porous carbon material with rich micropores and moderate specific surface area; a nitrogen-sulfur cocompound or copolymer is used as a doping agent, and the porous carbon material is doped under a hydrothermal reaction condition to prepare the nitrogen-sulfur co-doped porous carbon material. Performing low-temperature graphitization on the porous carbon under a nitrogen-sulfur co-doped catalytic condition to obtain a graphitized nitrogen-sulfur co-doped porous carbon material; then coating and forming the graphitized nitrogen-sulfur co-doped porous carbon material by taking an organic carbon source as a coating agent, an oxide with a perovskite structure as a catalyst and a lithium salt with high thermal stability as a pre-lithiation agent and adopting a kneading and compacting process; and carrying out high-temperature calcination, crushing and screening to prepare the high-capacity fast-charging graphite composite negative electrode material with the secondary particle structure.

The invention discloses a phase change energy storage and thermochromism cable overheat protection structure, which belongs to the technical field of cables, and comprises a conductor and a sheath layer, the sheath layer is arranged on the outer side of the conductor, a gradient phase change layer is arranged between the conductor and the sheath layer, the gradient phase change layer is made of paraffin / expanded graphite composite phase change material and coats the outer surface of the conductor, and the outer surface of the gradient phase change layer is coated with a thermochromism layer. The gradient phase change layer can absorb overload heat; the sheath layer comprises a base material, a thermochromic pigment and butyl stearate, the thermochromic pigment takes the base material as a matrix, and the color of the sheath layer is changed along with the change of the temperature. According to the invention, the gradient phase change layer is arranged between the conductor and the sheath layer, so that when a traditional cable is overloaded, the temperature of the conductor rises quickly, the protection response of a circuit breaker and the like lags behind, and the temperature rise cannot be inhibited at the initial stage of abnormal temperature. The gradient phase change layer is arranged to absorb heat, 30% of overload heat can be absorbed, peak temperature rise of the conductor is reduced, the temperature rise rate is reduced, the temperature rise process is obviously delayed, and the hysteresis defect of action of the circuit breaker is overcome.

The invention provides a hierarchical pore structure self-stabilized silicon-graphite composite negative electrode material and a preparation method thereof, and the preparation method comprises the following specific steps: S1, adding micron-sized AlSi10Mg ternary alloy particles and graphite into a solvent, carrying out ultrasonic dispersion, continuously stirring, and drying to obtain AlSi10Mg / graphite powder; s2, carrying out ball milling on the AlSi10Mg / graphite powder for later use; and S3, adding the ball-milled AlSi10Mg / graphite powder into an oxalic acid solution, and carrying out etching, washing and drying to obtain the target silicon-graphite composite negative electrode material named P-Si / Gr. The preparation process is simple, the synthesis is easy, the production efficiency is high, the preparation cost is low, the safety is high, and the prepared composite negative electrode material has high capacity retention ratio, excellent rate capability and cycling stability and good application prospect when being applied to a lithium battery.

The invention provides a weather-resistant matte PE material and application thereof in wind power and photovoltaic power generation, and relates to the technical field of PE materials. The weather-resistant matte polyethylene material comprises the following components in parts by weight: high-density polyethylene; 18 to 23 parts of an ethylene-octylene copolymer (POE); 8-15 parts of a nanometer laminated titanium dioxide / graphite fluoride composite weather-resistant filler; the thickness of the graphite fluoride sheet layer is 10-30nm; the ultraviolet response type matte regulating agent is prepared from spirooxazine photochromic molecules and surface hydroxylation needle-shaped aluminum oxide particles. By reasonably proportioning high-density polyethylene (HDPE), ethylene-octylene copolymer (POE), nano composite filler, ultraviolet response type matte regulating agent, high-energy light-harvesting inhibiting particles and damp-heat-resistant synergist, the material can obviously delay yellowing, pulverization and crack formation under the conditions of long-term outdoor wind and rain, ultraviolet radiation and temperature cycle; the comprehensive weather resistance is superior to that of the existing PE material.

The present invention belongs to the technical field of batteries and discloses a lithium-ion battery, which includes a positive electrode plate and a negative electrode plate. The active material of the positive electrode plate includes lithium cobaltate single crystal, and the active material of the negative electrode plate includes graphite and silicon particles mixed therein. The positive electrode plate further includes a lithium supplement agent, and the lithium supplement agent is Li2NiO2. The mass percentages X1 and Y1 of lithium cobaltate and Li2NiO2 in the positive electrode plate material satisfy: X1 + Y1 ≥ 90%, 0% < Y1 / (X1 + Y1) ≤ 6%. The present invention aims at a battery system with a single crystal lithium cobaltate positive electrode and a silicon-graphite composite negative electrode. By introducing Li2NiO2 as a lithium supplement agent into the lithium cobaltate positive electrode, it can solve the problem of low initial Coulomb efficiency of the negative electrode caused by the silicon-graphite negative electrode and give full play to the advantage of high volume energy density of this system.

The application provides a preparation method of graphene, and belongs to the technical field of graphene. The application comprises the following steps: step 1: preparing an electrolysis environment required by an electrolysis experiment: a graphite electrode, a prepared electrolyte, and a low-temperature environment; step 2: inserting the graphite electrolysis into the electrolyte with a proper electrode spacing and connecting a direct-current power supply, and waiting for a period of time to observe the stability; step 3: placing the electrolysis device built in step 2 into a low-temperature constant-temperature tank, setting a low-temperature temperature and a constant time, taking out part of the electrolysis slurry at a time for freeze-drying and then testing XRD, judging the quality of the graphene slurry, and obtaining graphene slurry with a 1-3 layer content of more than 70%; and step 4: obtaining graphene dry material after collecting and purifying the graphene slurry in step 3, namely graphene. The application prepares graphene by a low-temperature electrolysis experiment, so that more graphene can be prepared.

The invention provides a microcrystalline graphite composite material and a preparation method thereof, and relates to the technical field of lithium batteries, the microcrystalline graphite composite material comprises a core layer, a transition layer coated on the surface of the core layer, and a coating layer coated on the surface of the transition layer; the core layer comprises first microcrystalline graphite; the transition layer comprises second microcrystalline graphite and first amorphous carbon which are mixed with each other; the coating layer comprises second amorphous carbon; the second microcrystalline graphite is nitrogen-doped microcrystalline graphite, and the particle size of the second microcrystalline graphite is smaller than that of the first microcrystalline graphite. According to the composite material, a nitrogen-doped small-particle-size transition layer is used for constructing a gradient structure, stress is relieved, strength is enhanced, crushing and stripping are inhibited, and the compaction density is improved; and meanwhile, conductive transmission is optimized, and circulation and rate capability are synergistically improved.

The present application relates to the technical field of battery negative electrode material, and particularly relates to a starch-based hard carbon composite graphite negative electrode material, a preparation method and application thereof. The starch-based hard carbon composite graphite negative electrode material is obtained by mixing and fully grinding expanded graphite and esterified starch and then carbonizing. The starch-based hard carbon composite graphite material realizes large-capacity storage of lithium ions through the synergistic effect of biomass hard carbon and graphite, and promotes the reaction kinetics. The starch-based hard carbon composite graphite negative electrode material prepared by the present application exhibits large lithium ion storage capacity and good charge / discharge rate in a wide potential window. In addition, the capacity retention rate can still be above 90% after 100 cycles in the cycle test. The material realizes a technical breakthrough of high capacity and high rate performance in the lithium ion battery negative electrode.

The invention relates to the technical field of insulation board production control, and discloses an intelligent control method and system for graphite composite insulation board production based on data analysis. The method comprises the steps of obtaining process information and raw material information for producing a target product based on a product model; acquiring initial state data of each process, and selecting a target production mode based on the initial state data and the raw material information; obtaining an initial operation parameter value of each operation device of each process corresponding to the target production mode, and adjusting parameter setting of each operation device corresponding to the target production mode based on the initial operation parameter value; the method comprises the following steps: acquiring production parameter information of any process according to a first preset time interval, predicting and evaluating a product output by any process based on the production parameter information, judging whether the product processed by any process is abnormal or not, and if so, sending alarm information, the production efficiency, the product quality and the production decision scientificity of the graphite composite insulation board are improved.

The application discloses a lithium niobate-coated graphite composite negative electrode material and a preparation method and application thereof. x NbO y , wherein 0 ‑ 1 S / cm-10 ‑8 S / cm; the thickness of the lithium niobate is 0.01 nm-200 nm; and the lithium niobate-coated graphite composite negative electrode material is applied in a lithium ion battery, so that the rate performance of the lithium ion battery can be effectively improved, and the fast charging performance is improved.