205 results about "Graphite anode" patented technology

The invention discloses a graphite negative electrode powder laser particle size detection device, relates to the field of particle size detection, and solves the problem that an existing particle size detection device is difficult to continuously detect multiple batches of graphite samples, the graphite negative electrode powder laser particle size detection device comprises a device shell and a control top plate arranged above the device shell, and a driving rod and a laser detection head are mounted at the bottom of the control top plate; stirring fan blades are installed at the bottom of the driving rod, a rotating disc is rotationally installed at the top of the device shell, and two symmetrically-distributed detection cylinders and two symmetrically-distributed cleaning cylinders are arranged at the top of the rotating disc; the lifting mechanism is used for lifting the driving rod upwards, and the lifting mechanism is mounted on the inner side of the device shell; through the lifting mechanism, in the rotating process of the rotating disc, the stirring fan blades and the driving rod are lifted upwards and reset downwards, so that the stirring fan blades and the driving rod enter the detection barrel and the cleaning barrel conveniently, particle size detection of a graphite sample and cleaning of the stirring fan blades are realized, and the effect of continuous detection is achieved.

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

A grinding device for graphite anode processing relates to the technical field of graphite grinding, and is characterized in that the top of a grinding box is communicated and fixed with a feeding pipe, the inner side of the grinding box is rotatably connected with a material roller, the side surface of the grinding box is provided with a driving mechanism for driving the material roller to rotate, and the inner side of the material roller is provided with crushing chambers in a rotary array manner; the grinding device comprises a grinding chamber, a grinding unit is installed on the inner side of the grinding chamber, the grinding unit is in transmission connection with a grinding box through a transmission mechanism, a grinding chamber is formed in the middle of a material roller, the inner side of the grinding chamber is evenly filled with grinding balls, the grinding chamber communicates with the interior of the grinding chamber through a conveying pipe, and a one-way valve is assembled on the conveying pipe. According to the graphite powder collecting device, contact between the material and the external environment in the material collecting process is small, so that adverse effects on health of workers due to escape of graphite powder are avoided, meanwhile, the graphite powder is collected more thoroughly, and the situation that the production cost is increased due to the fact that the escaped graphite powder cannot be collected is avoided.

The invention discloses a method for preparing silicon carbide from a silicon waste material and a waste lithium ion battery graphite anode. The method specifically comprises the following steps: (1) respectively carrying out ball milling and mixing on the diamond wire cutting silicon waste material and the crushed and screened waste lithium ion battery graphite anode; (2) high-temperature smelting, ball milling and roasting; and (3) placing in an acid, stirring, leaching, centrifuging, washing, drying and ball-milling to obtain the high-efficiency leaching agent. According to the method, the diamond wire cutting silicon waste and the waste lithium ion battery graphite anode are used as preparation raw materials, silicon carbide is prepared and purified through the processes of ball milling, material mixing, smelting, roasting, acid leaching, centrifuging, drying and the like, and finally high-purity nanoscale silicon carbide particles are obtained. The recycling of the diamond wire cutting silicon waste and the graphite anode of the waste lithium ion battery not only can reduce resource waste and environmental pollution and improve the utilization rate of the waste, but also can generate considerable economic benefits.

The lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode comprises a negative electrode active material, the negative electrode active material comprises graphite and an amorphous carbon layer coating the surface of the graphite, the thickness of the amorphous carbon layer is X [mu] m, and the non-aqueous electrolyte comprises a first additive, the first additive comprises a compound A with a structure of a chemical formula 1, R1 and R2 are independently selected from hydrogen, a nitrile group, a carbonyl group, a C1-C12 alkyl group, a C2-C12 alkenyl group, a C2-C12 alkynyl group and a C3-C12 cyclic alkyl group, the mass percent of the compound A in the non-aqueous electrolyte is a%, 0.1 < a < 20, and X and a meet the condition that X / a is more than 1 and less than 10. According to the invention, the compound A is introduced into the non-aqueous electrolyte as an additive, and the fast charge cycle performance of the lithium ion battery can be effectively improved by regulating and controlling the relationship between the thickness of the amorphous carbon layer and the content of the compound A. # imgabs0 #

The invention discloses a novel graphite negative electrode material as well as a preparation method and application thereof. The novel graphite negative electrode material comprises a three-dimensional porous material with micropores, mesopores and macropores; wherein the aperture of the novel graphite negative electrode material is between 0.1 nm and 80 nm, the micropore rate is between 30% and 80%, the mesopore rate is between 20% and 50%, and the macropore rate is between 10% and 40%; the total pore volume of the novel graphite negative electrode material is between 0.5 cm < 3 > / g and 8 cm < 3 > / g, and the specific surface area is between 500 m < 2 > / g and 3500 m < 2 > / g; the novel graphite negative electrode material is obtained by carrying out oxidation and high-temperature expansion treatment on graphite to form mesopores and macropores and then forming micropores by using a pore-forming agent; the novel graphite negative electrode material disclosed by the invention is applied to a secondary battery, so that the polarization effect of the battery is effectively reduced, rapid transmission and storage of ions are facilitated, and the specific capacity and rate capability of the battery are effectively improved.

The utility model discloses graphite anode dipping equipment which comprises a base, one side of the base is fixedly connected with a storage pipe, the storage pipe is internally connected with a movable frame in a sliding mode, a plurality of graphite rods are arranged on one side of the movable frame in a penetrating mode, and the inner wall of the storage pipe is provided with a guide mechanism used for guiding the graphite rods in the moving process. A driving mechanism used for driving the moving frame to rotate is arranged on one side of the base. The graphite rod dipping device is provided with the mounting groove, the communicating groove, the arc-shaped groove and the like, the traction rod is driven to rotate by rotating the base, and the sliding block moves in the groove bodies in a plurality of communicating states, so that the moving frame can float up and down while rotating, the graphite rod is driven to move in a floating manner, and the dipping quality and effect of the graphite rod dipping device can be improved.

The invention discloses a hydrogen-fluorine atom doped graphdiyne material and a preparation method thereof, and relates to the technical field of carbon materials. According to the method, halogenated aromatic hydrocarbon and an alkynyl compound are taken as raw materials, a palladium catalyst and a copper catalyst are taken as a catalytic system, and an acetylenic bond of the alkynyl compound and the halogenated aromatic hydrocarbon are subjected to a Sonogashira coupling reaction to obtain the hydrogen-fluorine-doped graphite alkynyl material. The graphdiyne material provided by the invention has a large pore diameter, multiple active sites and high thermal stability and chemical stability, so that the hydrofluorine-doped graphdiyne material has excellent electrochemical energy storage property, shows reversible capacity of 1155mAh g <-1 > under 0.05 Ag <-1 > when being used as a negative electrode of a lithium ion battery, and can be used as a negative electrode of the lithium ion battery. And the density is almost 3 times that of a commercial graphite negative electrode material (300-350mAh g <-1 >). The application of the graphdiyne material in the field of electrochemical energy storage is obviously promoted.

A method for separation, purification and regeneration of spent lithium iron phosphate electrode materials is disclosed, the present disclosure removes the anode material graphite by selective water dissolution and separation of the anode binder, and achieves the leaching of lithium ions in the graphite anode material and serves as a lithium supplement agent; the surface modification and activation of spent lithium iron phosphate cathode materials are performed by high purity oxygen low-temperature plasma ashing technology, while removing organic matter to achieve the dissociation of lithium iron phosphate particles, the surface carbon content of spent lithium iron phosphate electrode materials is effectively controlled to achieve the objective of deep purification and carbon removal, moreover, the internal crystal structure of the electrode material is activated, the migration channel of lithium ion is activated, and the subsequent lithium supplement efficiency is greatly improved.

The invention relates to the technical field of electro-catalytic material synthesis, in particular to a preparation method of a nano TiO2 (at) AC (at) GPs electro-catalytic anode material, which comprises the following steps: firstly, depositing an amorphous carbon layer AC on the surface of graphite flake GPs by adopting a chemical vapor deposition method to obtain an AC (at) GPs composite material; cTAB is dissolved in a methanol / deionized water mixed solution and stirred evenly to obtain a solution A, a titanium sulfate solution is added into the solution A to obtain a precursor solution B, the precursor solution B and the AC (at) GPs composite material are mixed and then subjected to a hydrothermal reaction, after the reaction, a sample is washed, dried and roasted, and the nano TiO2 (at) AC (at) GPs electrocatalytic anode material is obtained. The preparation process is simple and efficient, the obtained nano TiO2 (at) AC (at) GPs electro-catalytic anode material has excellent electro-catalytic activity and cycling stability, the problems that a traditional graphite anode material is poor in electro-catalytic performance and the like are solved, and the nano TiO2 (at) AC (at) GPs electro-catalytic anode material has wide industrial application prospects.

The invention discloses a preparation method of a coated graphite negative electrode material. The preparation method comprises the steps of mixing, granulating and coating, graphitizing and the like. Pelleting and coating are carried out before the graphitization process, unstable components in asphalt are decomposed and release small molecules in the asphalt in the hot atmosphere of oxygen, oxidative dehydrogenation is carried out at the same time, oxygen molecules in the oxygen and asphalt molecules are crosslinked to form stable macromolecules in a mode of forming C = O bonds and C-O-C bonds, the asphalt molecules are difficult to graphitize, and the graphitization performance of the asphalt is improved. An ordered structure is not easy to form in the graphitization process, the hard carbon characteristic is achieved, a coating layer formed after coating is of a two-layer structure, the coating layer is composed of a hard carbon outer layer and a hard carbon-graphite transition phase, the binding force between a graphite inner core and the hard carbon coating layer can be improved due to the existence of the hard carbon-graphite transition phase, the hard carbon-graphite composite material is more suitable for high-rate charging and discharging, and meanwhile, the hard carbon-graphite composite material has a good application prospect. And coating and carbonization are not needed after graphitization, so that the preparation time is shortened, the preparation efficiency is improved, the preparation energy consumption is greatly reduced, and the preparation cost is effectively reduced.

The invention relates to the technical field of lithium ion batteries, in particular to a regenerated graphite negative electrode material containing a nitrogen-carbon layer and a preparation method and application thereof.The preparation method comprises the steps that waste graphite powder obtained by conducting microwave pretreatment on waste lithium ion battery negative electrode pieces and a nitrogen-containing organic sugar solution are mixed, and after a reaction, the regenerated graphite negative electrode material containing the nitrogen-carbon layer is obtained; a precursor of the coated graphite negative electrode material is obtained; and carrying out microwave heat treatment on the precursor of the coated graphite negative electrode material to obtain the regenerated graphite negative electrode material containing the nitrogen and carbon layer. In a microwave heat treatment process, graphite is rapidly heated under the action of microwaves, heat is directly conducted to a nitrogen-containing organic sugar coating layer on the surface of a precursor, in-situ carbonization of the nitrogen-containing organic sugar coating layer is rapidly and uniformly realized to form a nitrogen-containing carbon layer, and existence of nitrogen atoms on the surface of regenerated graphite reduces the adsorption energy of a negative electrode to Li < + > and promotes migration of Li < + >; and the nitrogen-containing carbon layer can effectively repair the surface defects and damage of the waste graphite, so that good rate capability is embodied.

The sealing structure of the present invention and the continuous reaction treatment equipment for graphite-based anode materials / phosphates and ternary cathode materials of lithium-ion batteries. The sealing structure includes sealing devices arranged at each main air leakage point of the rotary reactor. The sealing device includes a first solid sealing group, a gas sealing group, and a second solid sealing group arranged circumferentially along the rotary reactor. The first solid sealing group, the gas sealing group, and the second solid sealing group are arranged in sequence in the axial direction at the air leakage point and form an axial seal with each other. The coating carbonization / sintering equipment includes a feeding mechanism, a rotary reactor, and a discharging mechanism. The feeding mechanism and the discharging mechanism are docked at the corresponding feeding end and discharging end of the rotary reactor, and the above-mentioned sealing structure is provided at the docking positions of the rotary reactor with the feeding mechanism and the discharging mechanism. This equipment has the advantages of simple and reliable structure and good sealing performance.

The application provides a graphite ladle production powder intelligent weighing and compensation control method, relates to the graphite product production control technical field, and comprises the following steps: obtaining target formula parameters, raw material state data and discharging process data corresponding to each powder raw material in a graphite ladle blank batching weighing process, the graphite ladle production powder intelligent weighing and compensation control method, by obtaining the target formula parameters, raw material state data and discharging process data corresponding to each powder raw material, generating a weighing compensation collaborative control index, forming self-adaptive weighing control parameters and self-adaptive compensation control parameters matched with each powder raw material, realizing the collaborative identification and self-adaptive regulation and control of the discharging behavior, deviation formation mechanism and compensation demand in the graphite ladle blank batching weighing process, and improving the control precision, process stability and control adaptability of the powder weighing process.

The invention provides a graphite negative electrode material, a preparation method thereof and an electrochemical device. The preparation method comprises the following steps: (1) pretreating a coke material to obtain aggregate with D50 of 4-9 [mu] m, and the tap density of the aggregate is greater than or equal to 0.5 g / cm < 3 >; (2) mixing the aggregate and the liquid asphalt to obtain a mixed and kneaded material, and performing granulation treatment on the mixed and kneaded material to obtain a granulation product; and (3) carrying out graphitization treatment and carbon coating on the granulation product to obtain the graphite negative electrode material. Through cooperation of the small-particle-size aggregate, the liquid asphalt and carbon coating, the disadvantages of poor morphology, low compaction, low compaction and too low capacity of the traditional small-particle-size aggregate are broken through, and the rapid charging performance is effectively improved; and the method is more suitable for a fast-charging electrochemical device.

The application provides a method for promoting selective reduction of Fe3O4 in copper slag by carbon-containing anode through electrochemistry, which comprises the following steps: weighing a certain amount of dry and finely ground copper slag and placing the copper slag in a crucible, transferring the crucible with the copper slag into a leaner electric furnace, and heating the copper slag to a specific reaction temperature at a speed of 10 DEG C / min to obtain molten copper slag; then inserting a pretreated graphite anode and an inert high-melting point metal cathode, and inputting a certain voltage to perform electrochemical regulation; after power-off, the sample is placed for a period of time, and the sample is cooled to room temperature with the furnace; and the obtained sample has copper matte in the lower layer and molten slag tailings in the upper layer. The application uses a carbon-containing anode to replace coal powder in combination with electrochemical regulation, which can not only make the carbon-containing anode penetrate into the interior of the copper slag and increase the reducible depth of the molten slag, but also ensure the continuous work of the carbon-containing anode by the intervention of the electrochemical method, thereby solving the problem of low utilization rate of coal powder in the reduction of copper slag in industry.

The invention discloses a production device and method for a graphite negative electrode material of a new energy lithium battery, and relates to the field of graphite negative electrode material production device.The production device for the graphite negative electrode material of the new energy lithium battery comprises a supporting frame, and the inner wall of the supporting frame is fixedly connected with a charging barrel; a lifting plate is fixedly connected to the upper surface of the charging barrel, a first motor is fixedly connected to the upper surface of the lifting plate, supporting seats are installed on the two sides of the supporting frame, rotating rollers are rotationally connected to the surfaces of the supporting seats, the surfaces of the pair of rotating rollers are sleeved with a conveying belt, and a plurality of discharging discs are fixedly connected to the surface of the conveying belt. When the discharging disc located on the conveying belt rotates to the lower portion, the ejector rod makes contact with the surface of the inclined plate to push the push plate to move, the push plate pushes materials in the discharging disc out for stripping, then the push plate is driven to reset through the spring, and the problem that stripping cannot be well achieved after shaping is avoided.

The application provides a method for treating organic phosphorus in tanning wastewater by electrocatalytic ozone treatment with a modified foam iron electrode as a cathode, and the method comprises at least one pair of electrodes; the electrodes comprise a modified foam iron cathode and a modified graphite felt anode, the modified foam iron cathode is modified 40ppi foam iron; the method for treating organic phosphorus in tanning wastewater is as follows: the modified foam iron cathode and the modified graphite felt anode are placed in a reactor, the cathode and the anode are connected to a direct current power supply; the wastewater containing tetramethylphosphonium sulfate to be treated is added into the reactor, and the pH value of the wastewater is controlled in the range of 5-9; the mixed gas of ozone and oxygen is continuously introduced into the reactor, and the flow rate of the mixed gas of ozone and oxygen is controlled to be 0.1-0.5L / min per liter of wastewater; the direct current power supply is started to supply power to the graphite anode and the modified foam iron cathode, and the tetramethylphosphonium sulfate in the wastewater is continuously oxidized into orthophosphate salt between the electrodes; the crystallized orthophosphate salt is separated from the wastewater, and the organic phosphorus component in the tanning wastewater is removed.

The utility model provides a coating device for a graphite cathode material. The device comprises a fluidization unit and a stirring unit which are communicated with each other, the fluidization unit is arranged above the stirring unit; the fluidization unit comprises a fluidization cabin, a liquid inlet pipeline and a fluidizer; a first feeding hole and a first discharging hole are respectively formed in the top and the bottom of the fluidization cabin; the liquid inlet pipeline is arranged at the upper part in the fluidization cabin along the radial direction of the fluidization cabin; a plurality of atomizers with downward nozzles are arranged on the liquid inlet pipeline; the fluidizer is arranged at the lower part in the fluidization cabin along the radial direction of the fluidization cabin; a plurality of upward air outlets are formed in the fluidizer; the stirring unit comprises a coating kettle provided with a stirring element, a second feeding hole is formed in the top of the coating kettle, and the second feeding hole is connected with the first discharging hole. According to the coating device, the coating effect of the negative electrode material under the condition of low coating amount can be improved, so that the coating of the negative electrode material is more uniform; according to the coating device, the powder and the liquid-phase coating agent are mixed in a fluid form, and the treatment process is faster and more efficient.

This invention discloses a porous microcrystalline graphite anode material, its preparation method, and its application. The preparation method includes: thoroughly contacting microcrystalline graphite with an alkaline solution and then drying it, followed by a first calcination in an inert atmosphere to obtain a first porous microcrystalline graphite with etched grain end faces; impregnating the first porous microcrystalline graphite with an alkaline solution under vacuum pressure, drying it, and then calcining it again in an inert atmosphere to obtain a second porous microcrystalline graphite with etched grain end faces and interior; repeating the aforementioned operations, with each operation using a lower concentration of alkaline solution and a higher pressure, to obtain the porous microcrystalline graphite anode material. The preparation method of this invention, by repeatedly using an alkaline solution to impregnate the microcrystalline graphite under vacuum pressure, allows the alkali to penetrate into the pore structure and etch into the particle interior at high temperatures. The resulting porous microcrystalline graphite anode material has a pore structure that facilitates rapid lithium-ion transport, significantly improving the material's charge-discharge rate performance.

The invention discloses a graphite negative electrode material flow guide and moisture removal mechanism which comprises a drying bin body, a rotating plate, an exhaust pipe, an end rotating cover, a power motor and an exhaust pipe. A plurality of exhaust pipes are distributed in the graphite negative electrode material, the exhaust pipes are communicated with external airflow, moisture discharge of the graphite negative electrode material can be improved, the rotating plate, the exhaust pipes and the end rotating cover are driven by the power motor to synchronously rotate, and therefore the multiple exhaust pipes can uniformly move in the graphite negative electrode material, and the moisture discharge rate of the graphite negative electrode material is increased. Meanwhile, an exhaust pipe is mounted on a power cavity and conveys airflow to an airflow cavity of a rotating plate, the airflow is conveyed to a plurality of exhaust pipes through the airflow cavity, and rapid dehumidification can be performed through dehumidification holes of the exhaust pipes, so that the graphite negative electrode material is fed into a drying cavity to be stacked and stored; the inside of the graphite negative electrode material can be effectively prevented from being affected with damp, and the structural design is ingenious.

A method for restoring electrochemical activity and cycling stability to spent graphite anode material for a lithium-ion battery includes exposing powdered graphite anode material to boric acid to form borated material, then sintering the borated material. The processing removes dead lithium from the bulk structure and applies boron doping to surfaces of the graphite material.

The present invention relates to the field of carbon materials, and discloses a coal-based graphite anode material, a preparation method thereof and an application. The coal-based graphite anode material has a crystallite size L in the c-axis direction obtained by XRD c and a crystallite size L in the a-axis direction a satisfying the following conditions: 30 nm ≤ L c ≤ 70 nm, formula (I); 50 nm ≤ L a ≤ 120 nm, formula (II); the graphitization degree of the coal-based graphite anode material satisfies the following conditions: 85 ≤ graphitization degree ≤ 93, formula (III). The coal-based graphite anode material has high charge-discharge capacity, high first Coulomb efficiency and excellent rate performance, and its preparation method has simple process and low cost.

The invention discloses a material mixing method for graphite negative electrode material production, and relates to the technical field of graphite negative electrode material mixing. The method specifically comprises the following steps: S1, screening a graphite negative electrode material, and weighing for later use; s2, putting the weighed graphite negative electrode material for later use into material mixing equipment for stirring and material mixing treatment; wherein the material mixing equipment in the step S2 comprises a supporting frame plate and a mixing tank, two material distributing tanks are fixedly mounted on the supporting frame plate, the bottom ends of the two material distributing tanks fixedly communicate with communicating pipes, and the ends, away from the material distributing tanks, of the communicating pipes fixedly communicate with the mixing tank. According to the mixing method for graphite negative electrode material production, the rotating, lifting and position changing functions of the stirring rods in the mixing assembly are combined together, so that the stirring blades can fully and uniformly mix materials at multiple positions and depths, and the mixing effect and efficiency of the mixing method for graphite negative electrode material production are effectively improved.

The present disclosure provides an anode material and a battery. The anode material includes graphite, an interior and / or a surface of the graphite has pores, the anode material has an oil absorption value of O mL / 100 g, a pore volume of V cm3 / kg, a specific surface area of S m2 / g, and a powder porosity of Φ%, where 50≤O*V*S≤391, and 40≤Φ≤58. According to the anode material and the battery provided by the present disclosure, a reaction space capable of performing an effective lithium ion de-intercalation in the anode material is relatively sufficient, improving the high-rate charging-discharging performance of the graphite anode material.

This application belongs to the field of alkali metal ion battery technology, and more specifically, relates to a wide-temperature-range electrolyte suitable for alkali metal ion batteries and its application. The wide-temperature-range electrolyte for alkali metal ion batteries provided in this application includes an electrolyte salt, an organic solvent, and a film-forming additive, further including a monoglyceride and a bridging solvent for dissolving the monoglyceride; the interaction between the monoglyceride and the organic solvent can inhibit the reductive decomposition of the organic solvent and suppress the co-intercalation effect between the organic solvent and alkali metal ions. By adding a monoglyceride and a bridging solvent for dissolving the monoglyceride, and through formulation optimization, this application effectively solves the problem of incompatibility between organic solvents and graphite anodes, preparing an electrolyte with wide-temperature-range performance and good compatibility with graphite anodes, ensuring stable battery operation within a wide temperature range of -40℃ to 60℃.

The present application provides graphite anode particles, a preparation method thereof, a battery, and an energy storage device. The graphite anode particles of the embodiments of the present application comprise multiple layers stacked sequentially, each of which has a plurality of openings, each of which extends through a portion of the layers, and the size of each opening gradually decreases from the opening of the opening toward the bottom wall of the opening.

This invention discloses a precise grading device for graphite anode particles, belonging to the field of lithium battery material processing technology. It includes a grading box with a base mounted at its lower end. Multiple discharge ports are located on one side of the grading box. Multiple mounting frames are movably installed inside the grading box, with one end of each frame movably inserted into the discharge port. Rotating blocks are fixedly mounted on both sides of one end of each frame, and these rotating blocks are rotatably connected to the inner wall of the discharge port. A grading screen is detachably installed inside each mounting frame. This invention, through the synergistic effect of the separating components, achieves stable vibration and auxiliary screen cleaning of the grading screen, effectively solving problems such as easy screen clogging, unstable vibration, low grading accuracy, and inconvenient maintenance in traditional grading equipment. This ensures efficient, precise, and stable grading of graphite anode particles, providing standard-compliant graphite anode raw materials for lithium battery production and improving product consistency and battery performance.

The utility model provides a production system for an artificial graphite negative electrode material. The production system comprises green coke crushing and shaping equipment, asphalt crushing equipment, coating equipment before granulation, granulation equipment, depolymerization equipment, coating equipment before carbonization, finished product mixing equipment and finished product screening and demagnetizing equipment which are communicated with one another, the asphalt crushing equipment comprises an asphalt feeding station, a first rotary iron remover and a jet mill, the first rotary iron remover is arranged between the asphalt feeding station and the jet mill, and the jet mill is communicated with the coating equipment before granulation; the finished product screening and demagnetizing equipment comprises a semi-finished product screen, a plurality of electromagnetic iron removers and a post-iron-removal temporary storage bin, the semi-finished product screen is communicated with the finished product mixing equipment, and the plurality of electromagnetic iron removers are arranged between the semi-finished product screen and the post-iron-removal temporary storage bin in series; the post-iron-removal temporary storage bin is further provided with magnetic substance detection equipment, and the post-iron-removal temporary storage bin is further communicated with the semi-finished product screen. The content of magnetic substances in the finished product can be reduced, and the performance of the graphite negative electrode material is improved.

This invention relates to the field of battery materials technology and discloses a high-capacity graphite anode material and its preparation method. The preparation method includes the following steps: raw material selection and pretreatment, exfoliation and activation treatment, elemental doping modification, in-situ polymerization coating, carbonization treatment, crushing and sieving. By crushing, classifying and pretreating the waste graphite raw material with two-step acid washing (hydrochloric acid to remove metals and hydrofluoric acid to remove silicon), impurities in the raw material are removed, providing a high-purity graphite base for subsequent modification. Combined with liquid-phase exfoliation and high-pressure homogenization treatment, the number of graphite layers is reduced and the specific surface area is increased. At the same time, low-temperature plasma activation introduces active sites on its surface, enhancing the chemical reactivity of graphite. This lays a solid structural foundation for subsequent elemental doping and polymerization coating, thereby ensuring the stability and excellent performance of the final material.