114 results about "Graphite anode" patented technology

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 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 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.

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.

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.

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℃.

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.

The utility model discloses a production device capable of reducing unit consumption of a graphite anode, and relates to the technical field of rare earth production equipment. According to the technical key points, the device comprises an electrolytic furnace, a plurality of graphite anode plates are mounted in the electrolytic furnace, a nitrogen cover is arranged at the top of the electrolytic furnace, a gas seal unit is arranged in the nitrogen cover, and the gas seal unit can form a horizontal gas curtain at an opening in the top of the electrolytic furnace by utilizing nitrogen; and gas collecting equipment is arranged on the outer side of the nitrogen cover and is used for pumping away gas escaping from the upper part of the electrolytic furnace. The air seal unit additionally arranged at the furnace opening in the top of the electrolytic furnace can spray nitrogen in the nitrogen cover to form a nitrogen air curtain, so that air is prevented from making contact with a graphite anode plate above electrolyte, and the effects of reducing the oxidation rate of the graphite anode plate and prolonging the service life of the graphite anode plate are achieved.

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%.

The invention relates to the technical field of new energy storage, in particular to a bromine-modified high-rate graphite negative electrode material and a preparation method thereof. The bromine-modified high-rate graphite negative electrode material comprises graphite and a specific bromine modifier, and in the bromine-modified high-rate graphite negative electrode material and the preparation method thereof, the bromine-modified high-rate graphite negative electrode material is obtained by adding the specific bromine modifier and optimizing a preparation process. When the negative electrode material is applied to the potassium ion battery, graphite and a specific bromine modifier can form a stable composite structure, and high-magnification performance is realized. The material is simple in preparation process and easy to operate; raw materials are easy to obtain, reaction equipment is relatively simple, and the application prospect is relatively great.

This invention relates to the field of graphite anode material technology, specifically disclosing a surface-coated natural graphite, its preparation method, and its applications. The surface-coated natural graphite comprises a negatively charged natural spherical graphite core, which is coated with a positively charged micelle solution. A negatively charged MOF is grown on the positively charged micelles through electrostatic adsorption and crystal orientation induction. After curing and drying, a hard carbon source is coated on top, and high-temperature calcination is performed to prepare a natural spherical graphite core, an onion-like carbon framework and a nanocrystalline intercalation structure, an electrostatically coupled intermediate layer, and a hard carbon shell. The graphite anode material of this invention achieves optimized ion diffusion channels, optimized conductive networks, and expanded lithium intercalation sites. This structure significantly improves cycle life and specific capacitance, making it suitable for long-life lithium batteries.

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.

A system and method for providing cathodic protection in supercritical water oxidation (SCWO) processes, designed to prevent corrosion of metallic components under high-pressure and high-temperature conditions. The system includes a graphite anode and a noble metal reference electrode housed in ceramic-insulated assemblies, connected to process piping through tee-fittings. The method applies an impressed current to the anode while dynamically adjusting the voltage based on real-time measurements from the reference electrode. The system can include a dynamic offline test device for measuring current, voltage, and resistance of PFAS-contaminated aqueous streams to optimize cathodic protection.

The invention discloses a graphite anode life prediction method and device, electronic equipment and a storage medium, and relates to the technical field of rare earth electrolysis. According to the graphite anode life prediction method, physical characteristic parameters and technological parameters of a graphite anode are collected, and the collected physical characteristic parameters and technological parameters are input into an SVM-simulated annealing coupling prediction model after being subjected to abnormal value processing and normalization processing; according to the simulated annealing algorithm, a penalty factor C and a kernel parameter delta of the SVM are optimized through an adaptive temperature updating strategy and a Metropolis criterion, and local optimum is avoided. According to the method, a breakthrough from'artificial experience judgment 'to'mathematical model quantitative prediction' is realized, the problem of low precision of a traditional method is solved, and technical support is provided for graphite anode replacement cycle planning and cost control.

The utility model relates to an electrolytic photocatalysis device applied to the field of energy chemistry, which comprises reaction equipment, a reaction tube arranged at the inner end of the reaction equipment, a cushion block fixedly connected to the lower side of the inner end of the reaction tube, a quartz electrolytic tank placed at the upper end of the cushion block, a graphite anode and a nickel-based alloy cathode arranged at the inner end of the reaction tube, the graphite anode and the nickel-based alloy cathode extend into the quartz electrolytic tank, a sealing flange is arranged at the upper end of the reaction tube, a heat preservation tube plug is arranged at the inner end of the reaction tube, an air inlet valve is arranged in the middle of the upper end of the reaction tube, an air outlet valve is arranged on the right side of the upper end of the reaction tube, and a sealing electrode is arranged at the upper end of the reaction tube. The reaction equipment can support two working modes of the heating hearth and the solar simulator at the same time, is suitable for carrying out electrolysis and photo-thermal catalytic reaction on molten salt substances under the high-temperature condition, and can compare the performance difference of electrolysis products under the two heating modes.

The invention discloses a hexavalent chromium polluted underground water green remediation system and application. The hexavalent chromium polluted underground water green remediation system comprises a remediation well body and a non-contact sustainable electron injection system arranged in the remediation well body. The repair well main body comprises a shaft and a through hole formed in the wall of the shaft; the non-contact sustainable electron injection system comprises a medicament chamber and a graphite cathode plate; the medicament chamber is a closed space enclosed by a proton exchange membrane and a sealing plug, and a graphite anode plate and a sodium dithionite solution are accommodated in the medicament chamber; the graphite cathode plate is electrically connected with the graphite anode plate; according to the non-contact sustainable electron injection hexavalent chromium polluted underground water green remediation method, a reducing agent does not need to be added into a water-containing layer, the secondary pollution risk caused by the reducing agent and a product thereof is avoided, and green and efficient hexavalent chromium underground water remediation is achieved.

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.

The invention relates to the field of batteries, in particular to high-entropy oxide coated graphite, a graphite negative electrode, a lithium battery and a preparation method of the lithium battery. The graphite negative electrode material is coated with the high-entropy metal oxide, the high-entropy metal oxide forms a firm inorganic phase interface coating layer with low ion diffusion impedance on the surface of the graphite, and the inorganic phase interface coating layer can be used as an artificial SEI film and has the functions of electric insulation and ion conduction, so that contact between an electrolyte and a graphite negative electrode is effectively prevented, and the service life of the electrolyte is prolonged. The first-circle coulombic efficiency is improved; the coating layer has good high-temperature stability, reduces the consumption of electrolyte at high temperature, improves the high-temperature cycling stability and safety performance of the battery, and prolongs the service life of the battery.

The invention discloses a preparation method of a graphite negative electrode material capable of being rapidly infiltrated with an electrolyte. The preparation method comprises the following steps: S1, plasma activation; s2, roughening treatment is carried out; s3, printing a basic reticular layer; s4, manufacturing net-shaped ribs; s5, removing the basic reticular layer; and S6, graphite flake cleaning. After a graphite flake is subjected to roughening treatment, polylactic acid net-shaped layers are printed on the two sides to serve as a basic framework, net-shaped ribs are formed through line growth of the net-shaped layers through a sol-gel method or a chemical vapor deposition method, then the basic net-shaped layer is removed, the net-shaped ribs around the basic net-shaped layer are reserved to be of a protruding structure, a center groove is formed in an area defined by rib bodies due to removal of a template, and the basic net-shaped layer is formed. The convex reticular rib-central groove structure has'drainage 'and'liquid storage' functions, the reticular ribs can guide electrolyte to quickly diffuse on the surface of the graphite flake, and the two central grooves serving as micro liquid storage tanks can reduce transmission resistance, so that the problem of non-uniform infiltration of a traditional plane structure is solved, and various properties of the battery are improved.

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 invention relates to the field of lithium-ion battery technology, disclosing an electrolyte composition, an electrolyte, a method for preparing the same, and a lithium-ion battery. The composition contains a lithium salt, a film-forming additive, an organic solvent, and an auxiliary agent; wherein, based on the total weight of the electrolyte, the lithium salt content is 6-20 wt%, the film-forming additive content is 2-6 wt%, the organic solvent content is 75-90 wt%, and the auxiliary agent content is 2-10 wt%; the auxiliary agent is a combination of 4-iodophthalonitrile and 6-fluoro-nicotinamide in a mass ratio of 1:0.5-2. The electrolyte prepared from the electrolyte composition provided by this invention, when applied to a lithium-ion battery system with a single-particle graphite anode, can significantly improve the interfacial stability of the single-particle graphite anode at high temperatures, suppress the increase in anode polarization and gas generation problems; and can significantly improve the high-temperature cycle life and high-temperature rate performance of the lithium-ion battery.

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.