112 results about "Carbon graphite" patented technology

The invention discloses a lignocellulose biomass-based hard carbon negative electrode material as well as a preparation method and application thereof. The method comprises the following steps: carrying out hydrothermal pretreatment on lignocellulose biomass by using low-corrosivity maleic acid, and regulating and controlling the composition of the lignocellulose biomass, the maleic acid and the lignocellulose to obtain a precursor rich in lignin and cellulose; in the pyrolysis and carbonization process, the thermal stability of the precursor is improved, and the lignin can more effectively inhibit the rapid concentrated pyrolysis of cellulose, so that the rearrangement of pyrolysis products is weakened. The method is beneficial for preventing overgrowth of hard carbon graphite microcrystals during high-temperature carbonization, so that the hard carbon material with large interlayer spacing and abundant small-size closed pores is prepared. The hard carbon material shows high specific capacity and excellent rate capability when being applied to the negative electrode of the sodium-ion battery. Meanwhile, xylose and furfural generated by decomposition of hemicellulose in a liquid phase can be effectively collected, and full-component utilization of biomass is achieved. The requirements of green production are met, and industrial application is easy to realize.

The invention relates to the technical field of modified carbon graphite materials, and particularly discloses an antioxidant modified carbon graphite material and a preparation method thereof, the antioxidant modified carbon graphite material comprises the following raw materials by weight: 30-34 parts of medium temperature pitch, 4-6 parts of modified silica sol and 10-12 parts of artificial graphite powder; from two aspects, firstly, the aluminum dihydrogen phosphate and the boric acid aqueous solution are added, the aluminum dihydrogen phosphate can promote the asphalt to form a denser and firmer glassy carbon structure during carbonization, and phosphorus pentoxide generated by decomposition of the aluminum dihydrogen phosphate and boron oxide generated by dehydration of boric acid can generate a glass phase with an anti-oxidation effect; secondly, core-shell particles are added, a shell layer of the core-shell structure is an aluminum hydroxide structure generated by hydrolyzing aluminum nitrate nonahydrate, and an inner core is epoxidized nano silicon carbide; through the synergistic effect of the two, the mechanical property and the oxidation resistance of the carbon-graphite material are improved.

The invention discloses a multi-layer coated nano silicon negative electrode material and a preparation method and application thereof. The material is of a core-shell structure with a silicon core, a silicon dioxide middle layer, a hard carbon layer and a soft carbon outer layer. The preparation method comprises the following steps: (1) inner layer coating: generating a silicon dioxide or lithium silicate coating layer on the surface of nano silicon particles or silicon-based composite particles through in-situ oxidation or ectopic coating to form a core-shell structure; (2) middle layer coating: coating the surface of the core-shell structure obtained in the step (1) with a lithium-source-containing hard carbon or porous carbon layer to form composite particles; and (3) outer layer coating: coating the surfaces of the composite particles obtained in the step (2) with soft carbon, graphitized carbon or an organic-inorganic hybrid carbon layer to form three-layer coated nano silicon particles. Through a three-layer synergistic coating structure, the core problems of violent volume expansion, poor conductivity and unstable SEI film of the silicon negative electrode are effectively solved.

The invention relates to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device.The battery monomer comprises an electrolyte and an electrode assembly, the electrode assembly comprises a positive pole piece and a negative pole piece, and the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector; the negative electrode active material layer comprises carbon-coated graphite, and amorphous carbon is arranged on the surface of the carbon-coated graphite; the electrolyte comprises a solvent, and the solvent comprises linear carboxylic ester; in the first direction, the size of the negative electrode active material layer is larger than 130 mm, and the first direction is parallel to the gravity direction. According to the present invention, the carbon-coated graphite is adopted as the negative electrode active material, and is matched with the electrolyte containing the linear carboxylic ester, such that the problems of electrolyte local aggregation and low heat dissipation efficiency in the high battery cell can be effectively improved so as to prolong the cycle life of the battery monomer.

The application discloses a kind of self-sintering oxidation-resistant carbon graphite sealing materials and preparation method thereof, its method includes: activated agent, catalyst and hexagonal boron nitride are mixed and reacted, after washing, dry modified hexagonal boron nitride is obtained;Subsequently, it is put into mixing kettle, again and molten pitch impregnation kneading, then it is broken and sieved to obtain pitch-coated hexagonal boron nitride powder;Again, it is pressed into shape, and physical pressure semi-carbonization treatment is carried out under inert atmosphere, again it is broken and sieved to obtain green coke coated hexagonal boron nitride powder;Crosslinking agent is dissolved in solvent, then add mesocarbon microbead, heat reaction under inert atmosphere, obtain crosslinking modified mesocarbon microbead;Green coke coated hexagonal boron nitride powder and crosslinking modified mesocarbon microbead are mixed uniformly according to the mass ratio of 5-30:70-95, to obtain pressed powder;The pressed powder is pressed into block, then cold isostatic pressing forming is carried out to obtain green body block;Green body block is calcined, then graphitization treatment is carried out under inert atmosphere, and carbon graphite sealing material is obtained.

The invention relates to a carbon graphite sealing material and a preparation method thereof, and belongs to the technical field of mechanical sealing materials, the sealing material comprises the following components: natural graphite powder and phenolic resin powder, and the mass part ratio of the natural graphite powder to the phenolic resin powder is 1: (0.2-0.4). The hardness of the material is not lower than 70 HSD, and the volume density of the carbon-graphite sealing material is not lower than 1.70 g / cm < 3 >. The sealing material is tested on a pump, and the abrasion loss does not exceed 0.1 mu m after 200 hours. The preparation method of the material comprises the following steps: fully mixing natural graphite powder and phenolic resin powder in a V-shaped mixer, and kneading the obtained mixed powder in a kneading machine to obtain a kneaded paste; and crushing the kneaded paste, carrying out hot press molding, and curing in a drying oven to obtain the carbon-graphite sealing material. The preparation process is simple, the production cost is low, the service performance of the obtained material is greatly improved, and the service life is greatly prolonged.

The utility model belongs to the technical field of carbon graphite shaft sleeve machining, and particularly relates to a carbon graphite shaft sleeve inner hole machining device to solve the technical problems that different positions of the end face of a carbon graphite shaft sleeve cannot be circumferentially clamped, and the stability of circumferential clamping of the carbon graphite shaft sleeve cannot be improved. Comprising a circumferential positioning assembly, a connecting frame, a connecting screw rod, a locking nut, a frame assembly and a circumferential cutting assembly, the circumferential positioning assembly is connected with the connecting frame, the connecting frame is connected with the connecting screw rod, the connecting screw rod is connected with the locking nut, the connecting frame is connected with the frame assembly, and the circumferential cutting assembly is connected with the frame assembly. The distance between the two parallel circumferential positioning assemblies is adjusted along the connecting frame, so that the two parallel circumferential positioning assemblies clamp different positions of the end face of the carbon graphite shaft sleeve in the circumferential direction, and the stability of circumferential clamping of the carbon graphite shaft sleeve is improved.

Provided herein hybrid organic-inorganic redox active materials and related composites, compositions, electrode materials, electrodes electrochemical cells, batteries, methods and systems, which, can be used as to provide high performance cathode active materials in high capacity, high energy density, safe, and long-lasting electrochemical cells and batteries when coupled with Li, Na, K, graphite, lithiated graphite, in situ lithiated graphite, silicon, lithiated silicon, in situ lithiated silicon, silicon-graphite, in situ lithiated silicon-graphite, hard carbon, sodiated hard carbon, graphite-silicone, lithiated graphite-silicon etc. anodes in non-aqueous electrolytes.

The invention discloses a low-temperature lithium ion battery and a preparation method thereof, and relates to the technical field of low-temperature lithium ion batteries, the low-temperature lithium ion battery comprises a positive plate, a negative plate, a diaphragm and an electrolyte, a positive active material coating of the positive plate is titanium and cobalt doped lithium iron phosphate, and a negative active material coating of the negative plate is titanium and cobalt doped lithium iron phosphate; a negative active material coating of the negative plate is made of a hard carbon-graphite mixed material; the preparation method is used for preparing the low-temperature lithium ion battery. Compared with the traditional anode and cathode materials of the lithium iron phosphate lithium ion battery, the anode and cathode materials are improved, the deintercalation rate and migration rate of lithium ions from the anode of the lithium ion battery at low temperature are greatly promoted, and the low-temperature cycle performance of the lithium ion battery is improved.

The application provides a copper interconnection layer and a damascene process method of the copper interconnection layer. The side wall and bottom of a via and a trench for forming a copper interconnection line are formed with a barrier layer, which comprises a metal crystal adhesion layer or a graphene layer. The metal crystal adhesion layer can be a crystal Co layer, a crystal Ru layer or a crystal Os layer. The metal crystal adhesion layer can enhance the adhesion with Cu, effectively inhibit the diffusion of Cu into a dielectric layer and be beneficial to improving the electron migration performance of Cu. The formation of the metal crystal adhesion layer can effectively reduce the total thickness of the barrier layer and a first barrier layer and effectively reduce the resistance of the via. The graphene layer is an amorphous carbon / graphene composite layer. Due to the formation of the graphene layer, the copper interconnection layer has a lower resistivity. The formation of the graphene layer can also effectively reduce the total thickness of the barrier layer or the barrier layer and the first barrier layer and effectively reduce the resistance of the via.

The present invention discloses a large-flow carbon graphite floating ring seal leakage detection structure, comprising: a shell, wherein a hollow accommodating cavity is provided in the shell; a connecting seat with an annular structure, wherein the connecting seat is provided in the accommodating cavity; a shaft sleeve, wherein the shaft sleeve is used to connect a rotating shaft, wherein the shaft sleeve is provided on the inner side of the connecting seat, and wherein the shaft sleeve has two annular structures and axially arranged contact portions; a carbon graphite floating ring sealing device is provided between the contact portions and the connecting seat, and wherein the carbon graphite floating ring sealing device comprises a mounting seat and a graphite floating ring; the mounting seat is connected to the inner side of the connecting seat, wherein the graphite floating ring is provided on the inner side of the mounting seat, and a sealed fitting pair is formed after the graphite floating ring and the contact portion are in surface contact, wherein the graphite floating ring and the contact portion are in sliding fit; a sealed cavity is formed between the two contact portions through the fitting pair; the present invention relates to the field of carbon graphite floating ring seal technology.

The invention provides a furan resin impregnation method which comprises the following steps: step 1, putting a target carbon graphite material finished product or semi-finished product into an electric heating tank, and boiling with boiling water; step 2, putting the product boiled in the step 1 into a drying box for drying, cooling to a target temperature, and then taking out; step 3, putting the product taken out in the step 2 into an impregnating tank, sealing, and then opening a vacuum pump to vacuumize the impregnating tank; step 4, opening a furan resin communicating valve, pumping furan resin into the impregnating tank in the step 3 by utilizing pressure difference, then closing the furan resin communicating valve, and opening a pressurizing valve to pressurize the interior of the impregnating tank; and step 5, placing the resin-impregnated products in the step 4 in a curing tank in a staggered and layered manner, closing the curing tank, and carrying out pressurized curing treatment.

The utility model relates to a shield pump with an anti-impact bearing sleeve, and solves the problems that a motor is cooled by a medium, a rotor is continuously impacted by the medium, and the impact on a bearing is large in the shield pump. The device comprises a cylindrical pump body, a liquid inlet and a liquid outlet are formed in the two ends of the pump body respectively, a driving motor and an impeller driven by the motor are arranged between the liquid inlet and the liquid outlet, the driving motor comprises a stator and a rotor arranged on the inner side of the stator, a rotor shaft is arranged in the center of the rotor, and bearing sleeves are arranged at the two ends of the rotor shaft. The bearing sleeve is a sliding bearing sleeve made of carbon graphite, the outer side of the bearing sleeve is embedded in the bearing seat, and a plurality of annular buffering pieces are arranged between the outer wall of the bearing sleeve and the bearing seat. According to the shield pump disclosed by the utility model, the shaft end of the rotor shaft adopts the carbon graphite bearing sleeve, and the outer side of the bearing sleeve is provided with the plurality of annular buffer pieces, so that the problem of applicability of the carbon graphite bearing sleeve in the shield pump is solved.

The application belongs to the technical field of electrode materials, and particularly discloses a preparation and application of hollow carbon / graphene composite carbon, which comprises the following steps: preparing a graphene oxide aqueous solution; taking deionized water, adding tetraethyl orthosilicate, stirring, and adjusting the pH value by using ammonia water; adding dopamine hydrochloride into the tetraethyl orthosilicate hydrolysate, stirring, removing the supernatant by centrifugation, and then vacuum drying; taking the graphene aqueous solution, adding a silicon-carbon precursor; after sufficient stirring, freezing, and drying; placing in a tube furnace, carbonizing, washing three times with deionized water, and then vacuum drying; soaking in hydrofluoric acid, washing three times with deionized water, and then vacuum drying. The preparation and application of the hollow carbon / graphene composite carbon can solve the problem of insufficient chemical kinetic characteristics of existing carbon-based sodium ion battery negative materials.

The invention provides a hard carbon-graphite composite negative electrode material for a sodium ion battery and a preparation method thereof, and relates to the technical field of battery materials, the hard carbon-graphite composite negative electrode material comprises the following components by mass: 50-80 parts of graphite core, 15-45 parts of hard carbon shell, 1-5 parts of nano silicate modifier, and 1-3 parts of binder; the composite negative electrode material is of a core-shell composite structure, the graphite core serves as an inner core, the hard carbon shell coats the surface of the graphite core, and a nano silicate modifier forms a gradient buffer layer on a hard carbon-graphite interface; the graphite core is used for providing a high-electron conductive path and structural support; by adopting the core-shell structure, the high conductivity of the graphite core and the high sodium storage capacity of the hard carbon shell are fully cooperated, the defect of a single material is overcome, the volume expansion rate can be reduced to 5% or below through the nano silicate gradient buffer layer, the 2000-time circulation capacity retention rate is higher compared with an unmodified composite material, and meanwhile, the graphite core improves the compaction density and the energy density of the material.

The invention discloses a sulfonated graphene enhanced antioxidant carbon graphite sealing material preparation method, which comprises: (1) carrying out surface treatment on a hexagonal boron nitride nanosheet by using an alkali liquid to obtain a surface hydroxylated hexagonal boron nitride nanosheet; (2) mixing and reacting the surface hydroxylated hexagonal boron nitride nanosheet and sulfonated graphene in a solvent, and collecting a reaction product to obtain mixed powder; (3) mixing the mixed powder, graphite powder and calcined coke aggregate to obtain composite aggregate powder; and (4) adding the composite aggregate powder into a mixing and kneading pot, adding asphalt, performing mixing and kneading treatment, performing sheet rolling and crushing to obtain pressed powder, and performing mold pressing and roasting treatment on the pressed powder to obtain the carbon-graphite sealing material. According to the preparation method, sulfonated graphene and hexagonal boron nitride are used for synergistic modification, so that the problems that antioxidant h-BN additive powder is non-uniformly dispersed in a carbon graphite material, the interface bonding strength of h-BN and a carbon graphite matrix material is poor, and thermal expansion coefficients are mismatched are solved.

The invention discloses an antifriction and wear-resistant composite metal coating material based on MoS2 and a preparation method thereof in the field of metal coatings, double low-friction components are formed through MoS2 and a nitrogen-doped carbon graphite material, low-friction coefficient stability can be achieved, and the antifriction and wear-resistant composite metal coating material is far superior to a traditional metal coating; meanwhile, the metal-metal sulfide composite supporting phase endows the coating with high hardness and high toughness, the wear rate can be controlled and kept at a low level, and the core contradiction that a traditional coating is poor in wear resistance during friction reduction and poor in friction reduction during wear resistance is solved. In the invention, MoS2 is wrapped by a metal phase and nitrogen-doped carbon graphite carbon, contact with water molecules in air can be reduced, antifriction failure caused by generation of MoO3 is avoided, metal sulfide and metal elementary substance have excellent corrosion resistance, a corrosive medium can be prevented from permeating into the coating, and under corrosion-wear coupling working conditions (such as marine equipment and chemical pipelines), the corrosion resistance of the coating is greatly improved. The service life of the coating is longer than that of traditional coatings.

The utility model relates to the technical field of carbon product production, and provides a special carbon-graphite material high-efficiency pressurization mixing and kneading device which comprises a mixing and kneading machine body, a heating layer, a mixing reamer and a liftable gland, and a mixing and kneading machine heat preservation layer is arranged on the outer side wall of the mixing and kneading machine body and the outer side wall of the heating layer. According to the asphalt mixing and kneading machine disclosed by the utility model, air in coke fine powder is reduced through the vacuum-pumping system, the flowing resistance of asphalt is reduced, the penetration of the asphalt in coke pores is enhanced, and the filling degree and the bonding strength of the asphalt are improved. The compactness of the paste is improved by strong mixing and kneading under the action of a gland, and heat generated by friction is beneficial to asphalt flowing and polycondensation reaction, so that the coking value is increased. The S-shaped reamers are different from conventional reamers, cross-linking of the paste is intensified through a unique movement mode, strong convection is achieved, kneading is intensified through extrusion force generated by the included angle between the reamers and the pot wall, and the paste is more uniform.

Provided is a rotor capable of suppressing sticking.　A rotor 4 according to the present invention is used in an ultrasonic motor 1 comprising a stator 2 that has a vibrator 3 and a vibration generating element (piezoelectric element 13) provided on the vibrator 3, the rotor comprising: a rotor body 4A, and a sliding material 7 provided on the rotor body 4A and in contact with the vibrator 3. The sliding material 7 is made of carbon graphite.

The application discloses a MoS2-based friction-reducing wear-resistant composite metal coating material and a preparation method thereof in the field of metal coating, and forms a double low-friction component through MoS2 and nitrogen-doped carbon graphite material, so that low friction coefficient stability can be realized, and the low friction coefficient stability is far superior to that of traditional metal coating; meanwhile, the metal-metal sulfide composite support phase gives the coating high hardness and high toughness, and the wear rate can be controlled to remain at a low level, so that the core contradiction that traditional coating is poor in wear resistance while reducing friction or is poor in friction reduction while being wear-resistant is solved. In the application, MoS2 is wrapped by a metal phase and nitrogen-doped carbon graphite carbon, so that the contact with water molecules in the air can be reduced, and the friction reduction failure caused by the generation of MoO3 can be avoided; the metal sulfide and the metal element have excellent corrosion resistance, and can prevent corrosive media from penetrating into the coating, so that the service life of the coating is prolonged compared with that of traditional coating under corrosion-wear coupling conditions (such as marine equipment and chemical pipelines).

The application provides a test method and application for quantifying silicon-carbon and graphite capacity in a mixed electrode, and relates to the technical field of batteries. The test method uses XRD technology to obtain diffraction peak intensity of each phase of graphite in a pure graphite negative electrode sheet, calculates specific capacity constants corresponding to each phase of graphite according to the relationship between the diffraction peak intensity of each phase of graphite and the relative specific capacity of each voltage platform of the pure graphite negative electrode sheet, then obtains the diffraction peak intensity of each phase of graphite in a silicon-carbon / graphite mixed negative electrode sheet through XRD, combines the calculated specific capacity constants corresponding to each phase of graphite, measures the real specific capacity contribution of silicon-carbon and graphite under each SOC condition in the mixed negative electrode sheet, and calculates the lithium intercalation amount of the negative electrode material according to theoretical calculation. The test method can be applied to the determination of the silicon-carbon and graphite capacity in silicon-carbon / graphite mixed electrodes with different silicon doping ratios, the test result is real and reliable, continuous and stable, and the test time can be saved.

A blade outer air seal (BOAS) segment of a gas turbine engine includes a support component extending circumferentially in an arc and an arcuate ceramic matrix composite (CMC) sleeve that slides onto the support component. The support component may be made of metal such as a high Nickel (Ni) content alloy or a high Cobalt (Co) content alloy and includes a pair of rails. The CMC sleeve can be formed of a plurality of stacked plies to have a uniform thickness, and include arcuate upstream and downstream curves to engage the pair of rails. The CMC sleeve can be uniformly densified and maintain a uniform thermal gradient. A flexible insulation blanket formed of carbon / graphite felt may be disposed between the rails of the support component and the CMC sleeve to avoid the need to cool the support component.

The invention discloses a high-performance carbon graphite sealing material for an aero-engine and a preparation method thereof, and the method comprises the following steps: uniformly mixing superfine high-structure pitch coke powder, superfine graphite anode scrap powder, superfine green coke powder and nano carbon black to obtain composite aggregate, and putting the composite aggregate into a kneading pot; adding a mixed solution of higher fatty acid and absolute ethyl alcohol, mixing, removing absolute ethyl alcohol and water, adding the activated asphalt into the mixing and kneading pot, mixing and kneading, hot rolling, cooling, crushing and sieving to obtain the activated asphalt coated composite aggregate; putting the mixture into a high-pressure reaction kettle, vacuumizing, introducing argon into a replacement kettle, heating to 350-550 DEG C, pressurizing, preserving heat, cooling, and milling by a Raymond mill and airflow to prepare modified composite aggregate powder; and putting the modified composite aggregate powder into a kneading pot, removing moisture, adding the modified asphalt into the kneading pot, kneading, carrying out hot rolling, cooling, crushing and sieving to obtain pressed powder, carrying out compression molding and warm isostatic pressing to obtain a green body, and carrying out primary roasting and graphitization to obtain the carbon-graphite sealing material.

The utility model belongs to the technical field of carbon graphite shaft sleeves, particularly relates to a carbon graphite shaft sleeve chamfering device, and aims to solve the technical problem that round corner processing of a carbon graphite shaft sleeve cannot be realized. Comprising an installation platform, a limiting sliding lug plate, a lug plate open groove, a first sliding column, a sliding support, a thread fit casing pipe, a driving thread sleeve, a tip cone, an inner end spring, a first sliding groove, a second sliding groove, a clamping plate, a rectangular sliding block, a middle end sliding column, a first limiting block and a second limiting block, the limiting sliding lug plate is fixedly installed on the installation platform, and the lug plate open groove is formed in the limiting sliding lug plate; a first sliding column is slidably mounted in the open groove of the lug plate and locked through a first locking nut, a rectangular sliding groove is formed in the mounting platform, a first sliding plate is slidably mounted in the rectangular sliding groove, and the threaded sleeve is driven to be in threaded fit with the sleeve, so that the tip cone is separated from the carbon graphite shaft sleeve and rotates along with the rotating support plate. And the other end of the carbon graphite shaft sleeve is in contact with the polishing cone, so that the end part of the carbon graphite shaft sleeve is rounded or chamfered.

The present application belongs to the technical field of lithium secondary battery, and particularly relates to a fast-charging artificial graphite negative electrode active material, which comprises a graphitized carbon core, a graphene intermediate layer covering the core, and an amorphous shell layer with local graphitization covering the intermediate layer; the graphitized carbon core has micropore and mesopore structures, and comprises a soft carbon graphitized carbon matrix and coke-based graphite particles inlaid in the matrix. The present application also provides preparation of the material and application of the material in lithium secondary batteries. The material has excellent lithium adaptability, excellent capacity and fast-charging performance.

The utility model relates to the technical field of coating devices, and particularly discloses a reciprocating type glassy carbon graphite coating coating device which comprises a base, an air cylinder I is mounted on the surface of the base, and a shell is mounted on the surface of the base; a sliding structure is arranged in the shell, and the sliding structure is characterized in that a coating material box is installed on the surface of the shell, a pump body is connected to the surface of the shell, one end of the pump body is connected with the coating material box, one side of the pump body is connected with a pipeline, and a second air cylinder is embedded in the inner wall of the coating material box. According to the reciprocating type glassy carbon graphite coating coating device, a sliding structure is arranged, an infrared sensor is used for detecting materials, the infrared sensor controls a second air cylinder to move, the second air cylinder drives a spray head to move, the moving distance of the spray head can be controlled according to the size of the materials, and coating waste is reduced; and reciprocating spraying is conducted on the materials, and the practicability of the device is improved.

The application discloses a carbon graphite product pressing control system and method based on multi-parameter cooperation, relates to the graphite pressing control technical field, and sets initial process parameters for each processing link by using a process parameter setting unit, adopts a real-time monitoring unit and a feedback compensation unit, establishes a feedback mechanism for adjusting the initial process parameters by using real-time data, realizes first-stage adjustment of the process parameters, adjusts other parameters by using the correlation between different process parameters in a single processing link through a process parameter adjustment unit, realizes second-stage adjustment of the process parameters, and finally adjusts the process parameters of subsequent processing links by using real-time process parameters of previous processing links through a process parameter coupling unit, and completes third-stage adjustment of the process parameters. The application realizes optimization of the graphite product pressing process by establishing a three-stage adjustment mechanism for the process parameters, so that the quality of the graphite product is improved.

The application discloses an antioxidant sealing carbon graphite material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing and kneading semi-reinforcing carbon black and a binder A to obtain a first-stage material; (2) dry mixing calcined petroleum coke, calcined pitch coke, flake graphite, titanium powder and the first-stage material obtained in the step (1) to obtain dry powder; (3) adding aluminum oxide and a binder B to the dry powder in the step (2) and mixing and kneading to obtain a paste; (4) rolling, grinding, pre-molding and isostatic pressing the paste obtained in the step (3) to obtain a blank; and (5) performing one-time baking, impregnation, two-time baking and graphitization treatment on the blank in the step (4), so that the antioxidant sealing carbon graphite material is obtained. The carbon graphite material prepared by the application has high graphitization degree and good antioxidant performance.

The diaphragm involved in the present invention includes an intermediate layer and a coating coated on both surfaces of the intermediate layer. The intermediate layer is a carbon graphite / carbon nanotube layer, and the coating is a diamond-like coating. The carbon nanotubes are interwoven to form a porous membrane with a macroscopic membrane-like morphology and a microscopic network structure. The carbon graphite is interspersed in the internal gaps of the carbon nanotube porous membrane. The carbon graphite and carbon nanotubes together form a carbon graphite / carbon nanotube layer with a relatively dense internal structure. The diamond-like coating has high specific elasticity, high bending rigidity and high internal damping. The obtained diaphragm has good acoustic effect, good moisture-proof performance, good mildew resistance, low production cost and simple preparation method.

The present application relates to the technical field of sodium ion battery electrode material, and especially relates to a negative electrode material and a preparation method thereof, mainly comprising the following steps: (1) preparing carbon-coated antimony powder: adding a dispersing agent, carbon black and antimony powder in an aqueous solvent, and obtaining the carbon-coated antimony powder material through dispersion, drying and carbonization processes; (2) graphene compounding and coating: firstly, adding expanded graphite in the aqueous solvent, and after stirring, sanding, homogenizing and drying treatments, compounding the carbon-coated antimony powder and graphene oxide in the aqueous solvent, and obtaining the graphene-antimony composite material through spray drying and carbonization; (3) hard carbon coating: adding the graphene-antimony composite material in a citric acid solution, stirring uniformly, drying and carbonizing to obtain the hard carbon-graphene-antimony composite sodium ion battery negative electrode material. The sodium ion battery composite negative electrode material prepared by the method has the characteristics of good batch stability, high specific capacity, excellent rate performance and long cycle life.