48 results about "Graphite anode" patented technology

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.

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.

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.

This invention provides a modified graphite anode material, its preparation method, and a battery. The modified graphite anode material includes a graphite matrix material and C-F bonds modified at intrinsic defects in the graphite matrix material. The C-F bonds include ionic C-F bonds and covalent C-F bonds. The preparation method includes: liquid-phase mixing and coating the graphite material to be modified with a fluorine-containing compound solution to obtain a coated material; heat-treating the coated material under a protective atmosphere, during which the fluorine-containing compound decomposes to generate a fluorine-containing gas, which modifies the graphite material to be modified, thus obtaining the modified graphite anode material. In this invention, by modifying the surface defects of graphite with ionic C-F bonds, the intrinsic defects of graphite are neutralized, improving the electrochemical performance of the graphite anode material.

This invention discloses a semi-circular lithium metal electrolytic cell, belonging to the field of electrolytic cell technology. It includes a shell with interconnected semi-circular and square cavities inside. The square cavities gradually narrow from the connection points of the semi-circular cavities, and the ends of the square cavities furthest from the semi-circular cavities are connected by arc-shaped corners. The cathode is located inside the square cavity of the electrolytic cell, and the anode is installed at the top of the electrolytic cell and extends into the cathode cavity. This invention relies on the magnetic-thermal field generated by the graphite anode group within the square cavity to drive the molten salt electrolyte to generate a flow field. The varying spacing of the square cavities within the inner shell drives the lithium metal liquid to flow into the semi-circular cavity, while the arc-shaped corners prevent any residual lithium metal liquid.

This invention discloses a polymer coating material and its preparation method, as well as its application in artificial graphite anode materials. The polymer is synthesized from monomers, comonomers, and reaction auxiliaries under the action of an initiator. By controlling the amount of reaction auxiliaries added, the molecular weight of the polymer is controllable, and the side functional groups are adjustable. This polymer can uniformly coat the surface of artificial graphite, forming an artificial solid-state electrolyte interface, optimizing the lithium-ion transport path, and constructing a stable protective layer for the artificial graphite anode material. It can effectively improve the initial coulombic efficiency of the artificial graphite anode material, achieving an initial coulombic efficiency ≥91.8%.

This invention discloses a method for preparing rare earth metals by electrolytic oxides using a fluoride system, belonging to the field of rare earth metal preparation technology. This invention modifies graphite anodes used in rare earth molten salt electrolysis. It improves oxidation and corrosion resistance, reduces anode wear, lowers replacement frequency, and increases production efficiency, yielding high-purity, low-carbon rare earth metal lanthanum. A three-dimensional network framework material is constructed using Prussian blue self-assembly and SiC is deposited to obtain a composite framework material. During pre-calcination with graphite and other materials, the derivatives optimize the crystal structure and interfacial bonding, enhancing the strength of the pre-shaped anode material and ensuring the integrity and performance stability of the electrode structure. Thirdly, the pre-shaped anode material is impregnated with a specific impregnation solution, altering the gas diffusion path and resistance, inhibiting oxidation reactions, and high-temperature sintering generates substances that fill the pores, forming a dense microstructure. Simultaneously, the compounds formed by phosphoric acid enhance cohesion and adhesion, improving oxidation and molten salt corrosion resistance, and extending the service life of the graphite anode.

This invention relates to a CNT-bonded carboxyl-modified graphite anode material, its preparation method, and a lithium-ion battery using the material. The anode material comprises two components: oxygen-functionalized CNTs and carboxyl-modified graphite. These two components are tightly linked through a condensation reaction to form amide covalent bonds, resulting in a stable and continuous microstructure. The CNTs serve as both the interfacial mechanical and electrical enhancement phases. This unique structure, as an anode material, endows lithium-ion batteries constructed from it with better fast-charging performance and cycle stability compared to unmodified, original lithium-ion batteries.

This invention discloses a method for preparing a TiB2 coating that inhibits particle agglomeration during electrophoretic deposition, comprising the following steps: First, a fluoride salt mixture is prepared and divided into two parts. One part of the fluoride salt is mixed with boron powder and titanium dioxide powder, heated to form a molten salt, and the upper layer of molten salt is extracted. After rapid cooling, crushing, and grinding, TiB2-fluoride salt composite powder is obtained. Then, the other part of the fluoride salt is heated to form a base molten salt, and the TiB2-fluoride salt composite powder is added to the base molten salt. Electrophoretic deposition is then performed using a ring-shaped graphite anode and a cathode to be deposited. This method prepares highly dispersed TiB2-fluoride salt composite powder through in-situ synthesis, and then uses a ring-shaped anode to reduce the probability of TiB2 particle agglomeration during electrophoresis, effectively inhibiting particle agglomeration and improving the TiB2 electrophoretic deposition efficiency.

This invention relates to the field of lithium-ion battery technology and discloses a surface-modified graphite anode material and its preparation process. The process includes pretreatment, primary coating and heat treatment, wet chemical modification, secondary heat treatment, and washing and drying. By adding nano-silica powder and performing heat treatment in the primary coating and heat treatment step, a uniform preliminary modification layer is formed in situ on the surface of graphite particles. This layer structure helps to form a more stable solid electrolyte interface film in subsequent electrochemical cycles, thereby improving the first coulombic efficiency and cycle stability of the anode material. By introducing lithium salt solution and silane coupling agent to synergistically treat the primary modified graphite, the lithium salt provides an active lithium source to compensate for the irreversible capacity loss in the first cycle, while the silane coupling agent can enhance the chemical bonding between the graphite surface and the coating layer. The two synergistically improve the specific capacity and interface structure stability of the material.

This invention belongs to the field of carbonization technology, and in particular to a carbonization device for producing graphite anodes. It includes an outer furnace with an inner furnace inside a cavity, and stirring plates for stirring and kneading materials. There are two sets of stirring plates, with at least two in each set. The sidewalls of the inner furnace are two integrally formed C-shaped side plates, with each set of stirring plates corresponding to the space formed by the two C-shaped side plates. The outer furnace is equipped with a stirring mechanism for driving the stirring plates to perform stirring operations, and a switching mechanism for switching the stirring plates to a kneading mode. The two sets of stirring plates can switch between two states. When both sets of stirring plates are in a flat state, stirring can be completed inside the inner furnace. When both sets of stirring plates are comb-shaped, they can cross during the oscillation process, thereby creating a kneading effect on the materials inside the inner furnace.

This invention discloses a low-expansion, fast-charging modified graphite anode material, its preparation method, and its application. The method includes the following steps: A solution of alkaline earth metal fluorides is spray-dried to uniformly deposit onto the surface of crushed, pulverized, and granulated coke raw material, yielding a coke material containing alkaline earth metal fluorides; the coke material is then subjected to low-temperature activation treatment at 800-1000°C under an inert atmosphere to obtain a product; the product is mixed uniformly with the alkaline earth metal fluoride solution and impregnated, followed by graphitization under an inert atmosphere to obtain the modified graphite anode material. This invention introduces alkaline earth metal fluorides for doping modification during the preparation process, thereby promoting impurity removal, improving graphitization efficiency, and ultimately preparing an anode material with a low coefficient of expansion.

This utility model belongs to the field of graphite material processing technology, and relates to an iron removal device for graphite negative electrode materials. It includes a support box, an adsorption assembly installed inside the support box, a removal assembly and a collection assembly installed on one side of the outside of the support box, and a discharge assembly installed at the bottom of the support box. The adsorption assembly includes two mounting boxes installed on the outside of the support box. A first screw and a first sliding rod are rotatably and fixedly connected inside the two mounting boxes, respectively. The first screw and the first sliding rod are threadedly and slidably connected to a driving block, respectively. This utility model effectively adsorbs ferrous materials from graphite materials using a strong magnetic rod. Then, the strong magnetic rod is scraped by the clamps and interception grooves of the removal assembly to remove the ferrous materials. By regularly cleaning the ferrous materials on the strong magnetic rod, its adsorption capacity can be maintained, extending its service life.

This invention provides a coated graphite anode material, its preparation method, and a battery. The coated graphite anode material includes a graphite matrix material and an amorphous alumina coating layer covering the surface of the graphite matrix material; the amorphous alumina coating layer is doped with carbon material. In this invention, the graphite is modified by the carbon-doped amorphous alumina coating layer, resulting in a robust coating structure and excellent coating effect, which can effectively improve the material's high-temperature storage performance and cycle stability.

This invention relates to the field of battery technology, and in particular to a graphite anode material, its preparation method, and a secondary battery. The graphite anode material of this invention comprises multiple secondary graphite particles, each secondary particle comprising multiple primary graphite particles. The surface of each primary graphite particle is coated with a hard carbon layer, and each primary graphite particle has at least one pore containing hard carbon. The preparation method of the graphite anode material includes the following steps: granulating and graphitizing a mixture containing raw material coke and a hard carbon precursor sequentially to obtain the graphite anode material. In the graphite anode material of this invention, the hard carbon not only coats the surface of the primary graphite particles, forming secondary particles, but also penetrates into the interior of the primary graphite particles. The high disordered structure of the hard carbon is more conducive to lithium-ion intercalation. This graphite anode material exhibits excellent rate performance, initial charge-discharge efficiency, and cycle performance.

A high-capacity, dense anode material and its preparation method are disclosed. The preparation includes: mixing graphite micropowder with a first forming agent, such as asphalt, and a second additive, such as ammonium dihydrogen carbonate, to form a mixture; pressing the mixture into a blank; heat-treating the blank under a protective atmosphere to form a sinter; pulverizing the sinter into powder; mixing the powder with a third coating agent, such as phenolic resin, to form a homogenized material; and carbonizing the homogenized material to form, for example, a lithium-ion battery anode material. The anode material prepared by this invention can effectively shorten the migration distance during lithium-ion diffusion, greatly improve the rate performance of the material, effectively reduce defects on the surface and in the bulk of the graphite anode, ensure the formation of a smooth and stable specific surface area, further ensure the stable formation of the SEI film and structural stability during cycling, and effectively guarantee the material's high initial efficiency, high capacity, and long cycle performance.

This application provides a binder for graphite anodes, its preparation method, and its application, relating to the field of battery technology. The method includes: preparing a binder precursor liquid based on a variety of monomers and an initiator solution; wherein the variety of monomers includes soft monomers among hydrophobic monomers and hydrophilic monomers, the hydrophilic monomers include hydrophilic functional monomers and hydrophilic monomers, the hydrophilic monomers accounting for 45%~55% of the mass of the variety of monomers, and the soft monomers include a first soft monomer and a second soft monomer, the second soft monomer having a glass transition temperature less than -50°C. Then, the binder precursor liquid is cooled and the pH value is adjusted to a preset range to obtain the binder. The binder prepared by the above method possesses excellent electrode flexibility, slurry stability, and interfacial bonding strength, providing reliable support for improving the cycle life, rate performance, and structural stability of the battery.

This utility model discloses a screen structure for filtering fibrous foreign matter in a graphite anode material pipeline. It includes a base, a mounting shaft, and one or more screen assemblies. Each screen assembly comprises several parallel serrated plates, fixedly connected by connecting plates. A mounting shaft is vertically fixed to the base, and the screen assembly is sleeved on the mounting shaft. A limiting nut is screwed onto the top of the mounting shaft. Advantages: In use, this utility model is installed in the vertical pipe of the vibrating screen's discharge section. The annular chuck of the limiting disc engages with the edge of the lower section of the vertical pipe. When the material discharged from the vibrating screen passes through this screen structure in the vertical pipe, the fibrous foreign matter in the material is intercepted layer by layer by the screen assemblies. The intercepted material enters subsequent equipment from the lower section, while the fibrous foreign matter is intercepted on the serrated plates, thereby reducing its mixing into the graphite anode material product and improving product quality.

This invention relates to a method for preparing titanium alloys by molten salt electrolysis of titanium oxide using a liquid metal cathode, belonging to the field of molten salt electrolysis technology. The invention employs a liquid metal cathode molten salt electrolysis apparatus. The liquid cathode metal is placed in a cavity at the center of an insulating base. A mixture of TiO2 and fluorine-chloride molten salt is added to the electrolytic cell. A graphite anode is inserted at the top of the fluorine-chloride molten salt mixture in the electrolytic cell. An inert gas is introduced, and the temperature is raised to 700-850°C. The metal in the cavity at the center of the insulating base melts to form a liquid metal alloy cathode, and the fluorine-chloride molten salt melts to form a molten salt melt. The molten salt is electrolyzed at a constant voltage under an inert atmosphere. After electrolysis, the mixture is held at this temperature for 1-5 hours under an inert atmosphere, then cooled to room temperature. The molten salt and cathode are separated to obtain the titanium alloy. The liquid cathode of this invention has a depolarizing effect on TiO2 reduction, which can enhance the electrolysis and in-situ alloying of TiO2, reduce energy consumption, achieve clean production, and improve economic and environmental benefits.

The application discloses a stable preparation method of high-purity low-impurity sodium hypochlorite and belongs to the technical field of inorganic compound preparation. The preparation method comprises the following steps: a modified graphite electrode is installed on an anode, a stainless steel is used as a cathode, the distance between the cathode and the anode is 4mm-5mm, the concentration of a sodium chloride solution is adjusted to 32g / L-36g / L, the flow of the sodium chloride solution is controlled to be 3L / h-3.4L / h, the direct current voltage is set to be 5V-5.5V, the direct current is adjusted to be 52A-56A, and the power supply is turned on to prepare a sodium hypochlorite solution. The modified graphite electrode obtained by modifying the graphite anode material is installed on the anode to perform electrolysis, and a sodium hypochlorite solution with low iron ion impurity content and high effective chlorine concentration is obtained.

This invention discloses a method for preparing boron-nitrogen co-doped giant reed biochar lithium-ion battery anode. Using giant reed as a biomass precursor, a boron-nitrogen co-doped activated carbon material with abundant oxygen vacancies was successfully prepared through a direct pyrolysis reduction process assisted by the strong reducing agent sodium borohydride. When this material is applied to lithium battery anodes, it exhibits high reversible capacity (initial charge specific capacity reaches 518.2 mAh g⁻¹). ‑1 (above) and excellent cycling stability (maintaining 510 mAh g after 600 cycles) ‑1 Its charging specific capacity far exceeds that of commercial graphite anodes. This invention provides an effective way to realize the high-value-added utilization of giant reed resources.

This invention relates to a method for modifying waste graphite materials, the resulting modified graphite materials, and their applications. The method includes the following steps: (1) mixing a transition metal compound and a carbon material with a solvent to obtain a composite interface layer precursor; (2) adding purified graphite to the composite interface layer precursor obtained in step (1) for surface coating, heating, and forming a gel; (3) subjecting the gel obtained in step (2) to drying, grinding, and heat treatment sequentially to obtain a modified graphite material; the carbon material includes phenolic resin. This invention uses a sol-gel method for coating. The composite interface layer coated recycled graphite anode material is based on carbon coating, with the addition of transition metal oxides, and is uniformly dispersed on the particle surface by the sol-gel method. This preparation method is simple and safe, and the modified graphite material obtained has high and stable capacity performance as an anode material for lithium-ion batteries.

This invention discloses a lithium titanate-coated artificial graphite anode material, its preparation method, and its application. The lithium titanate-coated artificial graphite anode material includes artificial graphite and a coating layer covering the surface of the artificial graphite. The coating layer includes a carbon layer and a lithium titanate-coated layer covering the surface of the artificial graphite from the outside to the inside; the doping element of the lithium titanate-coated layer is molybdenum. This invention also provides a method for preparing the lithium titanate-coated artificial graphite anode material. Mo is introduced into lithium titanate to construct a doped structure, and the doped lithium titanate with good rate performance is coated on the graphite surface. A vapor-phase coated carbon layer is used to improve the conductivity of the lithium titanate coating layer, which can effectively improve the rate performance of the prepared coated artificial graphite anode, significantly improve the first coulombic efficiency, and the process route is simple and easy to implement.

Battery cell (20) comprising a first electrode arrangement (51) and a second electrode arrangement (52), wherein the first electrode arrangement (51) comprises a first active material layer arrangement (54), wherein the first active material layer arrangement (54) comprises a first layer (81), wherein the first layer (81) comprises at least one anode material from an anode material group consisting of graphite-silicon-carbon, and-silicon-composite-graphite, wherein a second layer (83; 83A, 83B) is arranged at least partially on at least one outer surface of the first layer (81), which second layer (83; 83A, 83B) comprises vertical graphene, wherein the vertical graphene is doped, and wherein a silicon-carbon coating (82; 82A, 82B) is arranged at least partially on the first layer (81).

This utility model discloses a filtration and purification device for the production of graphite anodes for lithium-ion batteries, belonging to the field of graphite filtration and purification technology. It includes: a shell with a feed pipe installed at the upper end and a discharge port at the lower end; and a sieve frame installed inside the shell for screening graphite entering the shell. The sieve frame reciprocates while rotating around the axis of the shell. This utility model can cause the sieve frame to oscillate while rotating, effectively dispersing graphite particles and impurities, improving the screening effect. Furthermore, the distribution plate allows graphite to disperse into the interior of the sieve frame, thus avoiding localized overload and affecting screening efficiency.

This utility model discloses a graphite anode material sieving machine, belonging to the field of graphite anode material sieving technology. The device includes a housing, a screen, a fixing plate, a vibrating component, and a fixing component. The screen and the fixing plate are both fixed inside the housing, with the fixing plate positioned on both sides of the screen. The vibrating component connects the fixing plate and the screen, and is further secured by the fixing component. The fixing component forms a first fixing position and a second fixing position on the fixing plate and the screen, respectively, and connects the first and second fixing positions together through a locking part to form a third fixing position. The advantage of this utility model is that by using the first, second, and third fixing positions, the vibration of the vibrating component on the screen is changed from point or line contact to surface contact, dispersing the concentrated stress generated on the screen during vibration and effectively protecting the screen for long-term operation.

This invention relates to the field of lithium-ion battery anode material technology, and particularly to a method for preparing isotropic modified graphite anode materials for high-rate lithium-ion batteries, comprising: Step 1: raw material pretreatment and primary isotropic shaping; Step 2: multi-stage spray granulation and pore structure control; Step 3: preparation and application of composite coating layer; Step 4: fusion heat treatment and interface strengthening; Step 5: surface stabilization and carbonization treatment, wherein the graphite particles obtained in Step 4 are mixed with a carbon precursor solution, and the carbon precursor solution is uniformly coated on the surface of the graphite particles using a fluidized bed apparatus, followed by carbonization treatment under an inert atmosphere, controlling the carbonization temperature to be lower than the graphitization temperature, so that the carbon precursor is transformed into an amorphous carbon layer, forming an amorphous carbon protective layer on the surface. Through carbonization treatment and the strengthening of the composite coating layer, the material possesses high chemical stability and good thermal stability, greatly improving the safety of the battery.

This invention discloses a composite graphite anode material and its preparation method. The material comprises: a graphite matrix, wherein the graphite matrix is ​​a secondary particle formed by hard carbon granulation of single-particle artificial graphite, and an amorphous soft carbon layer coating the surface of the graphite matrix. By constructing a composite structure of secondary particles and soft carbon spray coating through hard carbon granulation, a rapid lithium-ion diffusion channel is formed in the graphite matrix, and the interface is stabilized, significantly improving the high-rate fast charging performance and cycle stability of the anode material.

This invention provides a lithium-ion battery artificial graphite anode material and its preparation method, relating to the technical field of lithium-ion battery anode materials. The method includes the following steps: Step S1, preparation of an impregnation solution; Step S2, coating artificial graphite micropowder with asphalt; Step S3, surface modification; Step S4, high-temperature treatment and graphitization treatment. The lithium-ion battery artificial graphite anode material disclosed in this invention exhibits excellent electrochemical performance, high graphitization degree and compaction density, high charge / discharge capacity and initial coulombic efficiency, and excellent cycle stability.