121 results about "Graphite composite" patented technology

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention discloses an electroplated part, an electroplated part manufacturing method and a connector. The electroplated part comprises a base material; a nickel plating layer formed on the surface of the base material; the tin-graphite composite plating layer is formed on the nickel plating layer; the nickel plating layer is formed on the base material, the tin-graphite composite plating layer is formed on the nickel plating layer, the tin plating layer is formed on the tin-graphite composite plating layer, the nickel plating layer serves as a bottom plating layer of the base material, the tin plating layer serves as an outer plating layer of the base material, and the tin-graphite composite plating layer serves as a middle plating layer of the base material. According to the invention, the graphite particles exposed from the tin-graphite composite coating are partially or completely wrapped by the outermost tin coating, so that the graphite particles are not easy to fall off, the wear resistance and corrosion resistance of the electroplated part are improved, and the service life of the electroplated part is prolonged. In addition, the plating layer structure also has a relatively low friction coefficient, so that the insertion and extraction force of the electroplated part in the use process can be greatly reduced.

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

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

The invention discloses a pre-lithiated graphite composite material and a preparation method thereof, a pre-lithiated silicon-carbon composite material, a pole piece and a lithium ion battery. The pre-lithiated graphite composite material comprises graphite and a lithium-containing composite material, the lithium-containing composite material comprises a lithium-containing substance and a porous carbon coating layer arranged on the surface of the lithium-containing substance, the lithium-containing composite material is dispersed in the graphite, and at least part of the lithium-containing composite material and at least part of the graphite are connected together through an amorphous carbon skeleton; the lithium-containing substance comprises a lithium elementary substance and / or a lithium-containing compound. The lithium ion battery obtained by taking the pre-lithiated silicon-carbon composite material obtained from the pre-lithiated graphite composite material as a negative electrode material has excellent cycling stability, capacity performance and first effect, and is excellent in safety performance.

The invention relates to the field of ferrous metallurgy and high-temperature material engineering, in particular to a preparation method and application of a silicon steel annealing furnace roller surface coating based on a double-hollow graphite electrode plasma arc melting diamond-graphite composite coating. A current loop is formed, so that plasma arcs are generated between the electrodes; diamond powder, graphite powder and modified zirconium oxide powder are mixed, nickel-based self-fluxing alloy powder is added, and mixed powder is obtained; argon serves as carrier gas, and the mixed powder is fed into a plasma arc area through a double-hollow graphite electrode; the surfaces of the mixed powder particles are activated and are metallurgically bonded with the surface of a partially molten roller base material by utilizing high temperature and high energy generated by a plasma arc, and a diamond-graphite composite coating is formed on the surface of the roller in a cladding manner; and carrying out post-treatment on the diamond-graphite composite coating according to requirements.

This invention relates to the field of battery material preparation technology, and particularly to a high-capacity ultra-fast charging graphite composite anode material, its preparation method, and its application. The graphite composite anode material comprises, from the inside out: a graphite core, a hierarchical porous hard carbon layer, and graphene quantum dots; the graphene quantum dots are distributed within the pores and on the surface of the hierarchical porous hard carbon layer. Through a carefully designed gradient structure, this invention significantly improves the reversible capacity and cycle stability of the material while ensuring high initial coulombic efficiency.

The invention discloses a graphite composite material and a preparation method thereof, and a lithium ion battery, and relates to the technical field of battery preparation, the graphite composite material comprises an inner core and a coating layer at least partially coating the surface of the inner core; the material of the inner core comprises modified graphite, the modified graphite contains a doping element and a phosphorus simple substance, and the doping element comprises at least one of a boron element, a nitrogen element and a sulfur element; in the direction away from the inner core, the coating layer comprises a first carbon coating layer and a second carbon coating layer, and the first carbon coating layer comprises heteroatom elements. The graphite composite material provided by the invention has relatively high lithium ion migration rate and compaction density, so that the graphite composite material has relatively high dynamic performance and energy density.

This application relates to the field of lithium-ion batteries, disclosing a graphite composite anode material, its preparation method, anode sheet, and a lithium battery. The anode material comprises graphite, a conductive metal, and graphene quantum dots; the graphite forms the matrix core, coated with the conductive metal, and the graphene quantum dots coat the conductive metal. This application employs vapor deposition of the conductive metal, which can uniformly form a highly conductive metal layer on the graphite surface, improving charge / discharge capacity, enhancing charge transport performance and conductivity, resulting in a significant improvement in rate performance. Simultaneously, the simple evaporation of organic solvents allows for the uniform coating of nanoscale graphene quantum dots onto the metal / graphite composite material surface, effectively mitigating volume changes during charge / discharge and thus enhancing the rate performance and cycle stability of the composite material. Furthermore, using oil-based needle coke and pitch to prepare the graphite material can also improve the overall electrochemical performance of the anode material.

The utility model provides a novel flame-retardant and high-temperature-resistant civil air defense door, which belongs to the technical field of civil air defense engineering protection equipment and comprises a door frame, a composite door leaf, a rotating handle and a handle. The composite door leaf is composed of an anti-impact layer, a support, a heat-insulation flame-retardant layer and an inner layer, the anti-impact layer is made of a 2mm cold-rolled steel sheet, a first sealing groove is formed in the edge of the inner side of the door frame, and a second sealing groove is formed in the edge of the inner side of the door frame and located on the side face of the first sealing groove. The surface of the impact-resistant layer is coated with a high-temperature-resistant ceramic coating, so that the temperature is not easy to rise quickly in case of fire, the heat-insulating and flame-retardant layer is formed by composite filling of a 50-80mm ceramic fiber board and expanded graphite, the ceramic fiber board can provide a heat-insulating function, and the expanded graphite expands in case of high temperature to form a compact carbonized layer to isolate oxygen, so that the fire is not easy to break out, and fire spreading is prevented; and the structural stability and the protection performance in a high-temperature environment are realized.

The invention discloses a copper-graphite-nanometer copper oxide three-dimensional interface electrical contact material and a preparation method and application thereof, and belongs to the technical field of electrical contact materials.The copper-graphite-nanometer copper oxide three-dimensional interface electrical contact material is prepared from, by mass, 50-60% of small-size spherical copper powder, 0.5-1% of microcrystalline graphite, 0.5-1% of nanometer copper oxide, 0.5-1% of nanometer copper oxide and the balance copper oxide. According to the carbon content, the copper / nanometer copper oxide / graphite composite powder accounts for 5%-6%, the trace alloy elements account for 2%-3%, the balance is the large-size spherical copper powder, D50 of the small-size spherical copper powder is smaller than 1 micrometer, and D50 of the large-size spherical copper powder is 1-30 micrometers. According to the invention, by elaborately designing the spatial distribution and interface state of copper, graphite and nano copper oxide in the microscopic scale, collaborative optimization of conductivity, mechanical strength and arc performance is realized, and the high-performance, low-cost and environment-friendly electrical contact material is obtained.

The utility model discloses an anti-flash structure for a hub low-pressure casting die, which comprises a side die body, an inclined surface is arranged on a parting surface of the side die body, a groove is arranged on the inclined surface, a flexible graphite packing is embedded in the groove, a bolt is arranged in the groove, and the flexible graphite packing is arranged on the inclined surface of the side die body. And the flexible graphite packing is fixed on the side die body through a bolt. Compared with the prior art, the flexible dynamic sealing structure has the advantages that the inclined surface with the groove is arranged, the flexible graphite packing is embedded, and a countersunk bolt fixing structure is matched, so that the flexible dynamic sealing of the parting surface of the die is realized, the gap of the die is compensated, the leakage of molten aluminum is prevented, and the generation of flashes is reduced; the packing material woven by the flexible graphite composite coiled material is adopted, so that the sealing performance is stable in a high-temperature environment, the self-adaptive mold thermal expansion and cold contraction are realized, and the service lives of the mold and a sealing assembly are prolonged; the positioning groove is formed in the edge of the parting surface, so that precise assembly calibration of the side die and the adjacent die is achieved, assembly errors are eliminated, and the reliability of the sealing structure is improved.

The invention discloses a preparation method of a transition metal doped black phosphorus-graphite composite material based on a secondary ball milling method, which comprises the following steps: carrying out ball milling on black phosphorus and a transition metal precursor in an inert atmosphere to enable atomic-scale metal to preferentially react with the black phosphorus and form a stable M-P bond to obtain the transition metal doped black phosphorus; then, the obtained doped product and graphite are subjected to secondary ball milling, so that the doped product is uniformly embedded into a carbon material framework, a continuous conductive network is constructed, the obtained composite material can effectively inhibit irreversible collapse and serious volume expansion of a black phosphorus structure in the circulation process, interface bonding between the black phosphorus and the graphite is enhanced, and the performance of the composite material is improved. The charge transfer impedance is obviously reduced, the lithium ion diffusion rate is improved, and the electron transmission efficiency of the material is obviously improved; meanwhile, the atomic-scale dispersion structure can achieve a higher metal atom utilization rate, and when the composite negative electrode material is applied to a lithium ion battery, the composite negative electrode material has high specific capacity and excellent cycling stability and rate capability and has a wide fast charge energy storage application prospect.

The present application provides a negative electrode material and a secondary battery. The negative electrode material comprises graphite composite particles, a cross-section of each graphite composite particle being divided into an inner core region A and a near-surface region B, the near-surface region B being disposed around the periphery of the inner core region A, a pore filling rate of the inner core region A being a, and a pore filling rate of the near-surface region B being b, where 85%≤a / b≤99%, and b≥90%. The graphite composite particles in the negative electrode material provided by the present application have a high internal pore filling rate and a low specific surface area, and in particular, the near-surface region B has a higher pore filling rate. Even if the graphite composite particles are directly exposed to an electrolyte, the problem of performance deterioration is effectively ameliorated, thereby effectively improving initial Coulombic efficiency and interface transmission performance.

1. Name of the product in this design: Graphite composite bipolar plate (interdigitated single-sided flow channel). 2. Purpose of this design: It is used in the stack of flow batteries to connect and separate multiple batteries, conduct current, and provide support for the reaction. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

This invention relates to a gradient self-heating material based on phase change-oxidation synergistic regulation, its preparation method, and its application. The gradient self-heating material based on phase change-oxidation synergistic regulation comprises a core layer, a transition layer, and a shell layer connected sequentially; wherein the core layer is a reduced iron powder-phenolic resin composite layer; the transition layer is a gradient transition structure of iron powder, CNT-graphite composite material, and resin; and the shell layer is a catalytic phase change material particle-resin composite layer; the volume percentages of the shell layer, transition layer, and core layer are 20%-30%, 20%-30%, and 40%-60%, respectively. The problem this invention aims to solve is overcoming the interfacial failure challenge between the oxidant and the phase change material through chemical bonding reconstruction, breaking through the thermal accumulation bottleneck by employing a gradient thermal conductivity structure design, and achieving cross-scale synergy across four dimensions: exothermic reaction, heat storage phase change, heat conduction, and dynamic regulation. The final product's thermal response time (temperature greater than 50℃) is <30 seconds.

The invention discloses a graphite composite material and a preparation method thereof, a negative plate, an electrochemical device and electronic equipment. The graphite composite material sequentially comprises an inner core, a first coating layer and a second coating layer from inside to outside, the inner core comprises porous graphite and a silicon simple substance, and at least part of the silicon simple substance exists in pores of the porous graphite; the first coating layer is a carbon coating layer; the second coating layer comprises lithium titanate; the silicon elementary substance accounts for 18%-27% of the mass of the graphite composite material; the mass percent of the lithium titanate in the graphite composite material is 0.5%-1.2%; the specific pore volume of the limited pores of the graphite composite material is 0.09 cm < 3 > / g to 0.21 cm < 3 > / g, and the limited pores refer to pores with the pore diameter of 0.2 nm to 5 nm. When the graphite composite material provided by the invention is applied to the lithium ion battery, the lithium ion battery has both capacity and long circulation.

The utility model relates to the technical field of positive electrode tabs, and provides a nickel-plated copper positive electrode tab with high corrosion resistance, which comprises a connecting sheet and a positive electrode tab, the protective structure is arranged, the first base layer and the second base layer are made of copper materials, the corrosion-resistant layer is made of nickel materials, and the first base layer is covered with the corrosion-resistant layer through electroplating, so that the corrosion resistance of the first base layer can be greatly improved, and the service life of the materials is prolonged; the lithium ion battery tab has excellent conductivity, can effectively reduce the impedance of the tab, improves the conductivity of the tab, and is beneficial to bearing large current, the thermal insulation layer is made of a graphite composite board material, can effectively isolate external heat, prevent the internal temperature of the battery from being too high, and avoid the risk of thermal runaway, and the waterproof layer is a film, so that short circuit is prevented; and excellent electrolyte resistance, corrosion resistance and stable conductivity are provided, smooth internal and external connection of the battery is ensured, and smooth flow of electric energy is ensured.

The invention relates to a natural graphite and artificial graphite composite derived negative electrode material, preparation and a lithium ion battery, and belongs to the technical field of lithium ion batteries. Natural graphite and artificial graphite are used as main active substances, a proper amount of polyvinylpyrrolidone is added to serve as a polymer binder and a dispersing agent, and the electrode microstructure is optimized by accurately regulating and controlling the dosage of each substance, so that the cycling stability and the rate capability of the graphite negative electrode are improved. The composite strategy can effectively combine the high-capacity characteristic of natural graphite and the structural stability of artificial graphite, and the cycle life of the material is remarkably prolonged while the electrochemical dynamic behavior of the material is improved.

The invention provides a polyether modified polyurethane antistatic composite coating as well as a preparation method and application thereof, and relates to the technical field of conductive coating compositions under high-performance coatings. The flexibility of the coating is improved through polyether polyol modification, chemical bonding is established between resin and a carbon nanotube-graphite composite conductive filler by adopting an in-situ anchoring technology, a stable three-dimensional conductive network is constructed, and an environment-friendly solvent and a functional additive system are matched. According to the scheme, the technical problems that a traditional anti-static coating is poor in adaptability to a flexible base material and the anti-static performance is prone to attenuation are effectively solved, and the coating has the stable anti-static performance (the resistance change rate lt; 12%) and good durability, and the long-term use requirements of flexible base materials such as seats and the like are completely met.

The invention discloses a graphite composite material and a preparation method thereof, a negative plate, an electrochemical device and electronic equipment. The graphite composite material comprises an inner core and a coating layer coating the surface of the inner core, the inner core comprises porous graphite and a silicon simple substance, and at least part of the silicon simple substance exists in pores of the porous graphite; the silicon elementary substance accounts for 7.5 wt%-18 wt% of the graphite composite material in percentage by mass; the mesoporous specific pore volume v of the graphite composite material is 0.04-0.1 cm < 3 > / g, and the compaction fitting coefficient K1 is 3.5 * 10 <-3 >-4.5 * 10 <-3 >. The graphite composite material provided by the invention can realize high silicon doping proportion and low expansion, and the battery has good cycle performance when being applied to the battery.

A negative electrode material, a negative electrode sheet, and a secondary battery are disclosed. The negative electrode material includes a core and a coating layer disposed on at least a portion of the surface of the core. The core includes multiple graphite composite particles, each comprising graphite and a filler. The cross-section of each graphite composite particle has macropores and micropores, with the macropores having a diameter greater than 0.2 μm and the micropores having a diameter less than or equal to 0.2 μm. Among n particles, the uniformity of macropore distribution is X, and the uniformity of micropore distribution is Y. Simultaneously, the orientation degree of the negative electrode material obtained by X-ray diffraction analysis is Z. When X ≥ 62%, Y ≥ 65%, and Z ≤ 20, the negative electrode material exhibits good cycle performance.

The invention discloses a preparation method of a high-magnification graphite composite material, which comprises the following steps: crushing a coke raw material, mixing the crushed coke raw material with carbon nanotubes, pre-carbonizing, graphitizing to obtain a carbon nanotube doped graphite material, etching the surface of the carbon nanotube doped graphite material by concentrated nitric acid steam, washing with deionized water until the carbon nanotube doped graphite material is neutral, and carrying out vacuum drying to obtain the high-magnification graphite composite material. The porous carbon nanotube doped graphite material is obtained, and the amorphous carbon / lithium coated carbon nanotube doped graphite composite material is obtained through gradient deposition of metal lithium and amorphous carbon. The electron and ion conductivity of the material can be improved, and the rate capability, the high-temperature performance and the energy density can be improved.

The application discloses a preparation method of a high electrochemical activity nanodiamond / graphite composite film electrode. First, a nanodiamond / graphite composite film electrode is prepared through hot wire chemical vapor deposition, then, atomic layer deposition equipment is used to deposit platinum metal atoms on the surface of the composite film electrode, then, the composite film electrode is placed in an H2SO4 solution and connected to an electrochemical workstation to perform cyclic voltammetry treatment, and finally, the target electrode is obtained. The method can significantly improve the electrochemical activity area of the nanodiamond / graphite composite film electrode, provides a new idea and scheme for the design and preparation of a novel nanodiamond-based composite film electrode, and has great application prospects in the fields of electrocatalysis and electric energy storage.

The invention relates to the technical field of sealing, and discloses a novel graphite composite gasket which comprises a pressure container and a pipeline, a feeding port is formed in the top of the pressure container, a positioning groove is formed in the top of the feeding port, a flange is arranged at the bottom end of the pipeline, a gasket body is arranged at the bottom of the positioning groove, and a breather valve is fixedly installed at the top of the flange. A buzzer alarm is fixedly installed on the top of the breather valve, and an air storage assembly is arranged between the gasket body and the flange. According to the gasket, the extension ring is arranged at the top of the graphite base body of the gasket and inserted into the containing groove in the bottom of the flange, the containing groove forms a relatively-closed cavity, gas filled into the containing groove cannot overflow, and once the sealing performance of the gasket fails, the gas in the containing groove is diffused into the external environment, so that the sealing performance of the gasket is improved, and the service life of the gasket is prolonged. And then the buzzer alarm is triggered to give an alarm sound to quickly remind a worker, so that the worker can deal with a fault in time, and medium leakage and safety accidents caused by sealing failure are effectively prevented.

The present application relates to a kind of soft carbon and graphite composite negative material and its preparation method and lithium ion battery.The soft carbon and graphite composite negative material includes soft carbon and graphite ball dispersed on the surface of soft carbon, and part of the graphite ball is embedded in the interior of the soft carbon.The preparation method includes the following steps: (1) catalyst solution is coated on the surface of carbon material, and first drying is obtained mixture;(2) carbonization treatment is carried out to the mixture of step (1), and carbonized material is obtained;(3) acid washing treatment and water washing treatment are sequentially carried out to the carbonized material of step (2), and after second drying, the soft carbon and graphite composite negative material is obtained.The soft carbon and graphite composite negative material prepared by the present application is embedded and combined, has excellent kinetic performance and high negative material capacity and high initial efficiency.

This invention discloses a fast-charging graphite composite material, its preparation method, and a lithium-ion battery, relating to the field of battery manufacturing technology. The preparation method of the fast-charging graphite composite material includes the following steps: S1, mixing artificial graphite, an intercalating agent, an oxidant, and water, and carrying out a hydrothermal reaction to obtain modified graphite; S2, subjecting the modified graphite to a sulfur doping reaction under a sulfur source gas atmosphere to obtain sulfur-doped modified graphite; S3, providing a coating liquid, the coating liquid comprising a resin, an inorganic carbon conductive agent, and an organic solvent; S4, mixing the coating liquid and the sulfur-doped modified graphite, and sequentially performing a first carbonization treatment and a second carbonization treatment under an inert atmosphere to obtain the fast-charging graphite composite material. The fast-charging graphite composite material prepared by the method of this application exhibits both good fast-charging performance and cycle performance.

The application discloses a lithium ion battery non-aqueous electrolyte and a lithium ion battery. The battery electrolyte comprises an electrolyte lithium salt, an organic solvent and a composite functional additive, and the composite functional additive comprises fluoroethylene carbonate, propylene sulfite, compound I and compound II. On the basis of the first two additives, the interaction of the multiple functional groups of the latter two can improve the stability of the positive and negative electrode film interface, and compared with the electrolyte additive with a single functional group, the normal temperature cycle and high temperature cycle performance of the battery can be improved. Especially for the lithium ion battery with graphite as the negative electrode material, a single crystal silicon and graphite composite material, or a silicon monoxide and graphite composite material, the lithium ion battery has high safety, excellent normal temperature cycle stability and high temperature cycle stability.

The application discloses a method for preparing an amidoxime modified cellulose-oxidized graphite composite uranium adsorbent by irradiation, and belongs to the field of uranium-containing radioactive wastewater treatment. The present application aims at solving the problems of low grafting rate of the existing cellulose surface, limited number of functional sites for uranium, and uranium adsorption performance to be improved. The method comprises the following steps: 1, preparing acrylonitrile grafted cellulose by irradiation; 2, amidoxime modification; and 3, adding oxidized graphite. The application is used for preparing an amidoxime modified cellulose-oxidized graphite composite uranium adsorbent by irradiation.