85 results about "Graphite particle" patented technology

The present invention relates to a method for producing a negative electrode active material, the method comprising the steps of: mixing green coke particles, calcined coke particles, and a binder; and graphitizing the mixture by heat treatment to form artificial graphite particles in the form of secondary particles in which primary particles of artificial graphite are combined with each other, wherein an average particle diameter (D 50 ) of the green coke particles is greater than an average particle diameter (D 50 ) of the calcined coke particles.

To reduce the insertion / removal resistance between the terminal and the mating terminal. [Solution] The present invention discloses a terminal and a method for manufacturing a terminal. The terminal comprises a terminal body 10 having a mating portion 11 for mating with a mating terminal. A first bottom plating layer 11a is formed on the contact surface of the mating portion 11 of the terminal body 10, and a first silver-graphite plating layer 11c is formed on the first bottom plating layer 11a. Graphite particles are uniformly dispersed in the first silver-graphite plating layer 11c to improve the wear resistance and conductivity of the mating portion 11 of the terminal body 10. In the present invention, the silver-graphite plating layer has excellent wear resistance and conductivity, can significantly increase the number of mating cycles between the terminal and the mating terminal, and can reduce the insertion and removal resistance between the terminal and the mating terminal.

The present invention relates to a negative electrode and a lithium secondary battery comprising same. Specifically, the negative electrode comprises: a current collector; and a negative electrode active material layer disposed on at least one surface of the current collector, wherein the negative electrode active material layer comprises a carbon-based active material and a silicon-based active material, the carbon-based active material comprises artificial graphite particles in the form of secondary particles in which a plurality of primary particles are aggregated, the sphericity of the primary particles is 0.60 to 0.78, and the ratio of the average particle diameter (D50) of the silicon-based active material to the average particle diameter (D50) of the artificial graphite particles in the form of secondary particles is 0.4 to 1.

To provide a negative electrode plate in which stress due to expansion and contraction of Si-based particles is relieved, and a secondary battery including the negative electrode plate. [Solution] A negative electrode plate comprising a negative electrode current collector and a graphite layer laminated on the negative electrode current collector, wherein the graphite layer contains large graphite particles with an aspect ratio of 1.5 or more, small graphite particles with an aspect ratio of 1.5 or more, and Si-based particles, wherein in the graphite layer, there are more Si-based particles on the side opposite to the side in contact with the negative electrode current collector than on the side in contact with the negative electrode current collector, the average particle size D50 of the Si-based particles is 0.4 to 1 times the length of the smaller of the average major axis diameter a1 of the large graphite particles - the average major axis diameter a2 of the small graphite particles, or the average minor axis diameter b2 of the small graphite particles, and the Si-based particle content is 10 volume% or less of the total volume of the graphite layer.

We provide a perovskite solar cell that enables high integration. [Solution] The perovskite solar cell 100 comprises a transparent conductive film 10 provided on a light-transmitting substrate 1, a plurality of solar cell elements 20 provided on the transparent conductive film 10, and carbon electrodes 30 laminated on each of the plurality of solar cell elements 20 and connected to the transparent conductive film 10 via the side surface of the solar cell element 20. A groove 70 is provided between two adjacent solar cell elements 20 and the carbon electrode 30 provided on the side surface of one solar cell element 20 and the other solar cell element 20. The carbon electrode 30 is composed of flake-shaped graphite particles, and the minimum width of the groove 70 is 6 times or more and 13 times or less the maximum outer dimension of the graphite particles.

The utility model relates to the antiaging structure technical field of ceramic temperature controller, and disclose an antiaging structure of ceramic temperature controller, including base, the one side fixed connection of base has the antiaging component, the inside fixed connection of base has the damping seal component, the antiaging component includes the fixed connection in the seal pad of base one side, the inboard fixed connection of seal pad has the connecting block, the one side fixed connection of connecting block has silver alloy, the bottom fixed connection of silver alloy has graphite particle dispersion layer, the damping seal component includes the fixed connection in the damping gel of base inside, the top fixed connection of base has the rubber cover, the surface fixed connection of rubber cover has the spring. The antiaging structure of ceramic temperature controller, through the setting of antiaging component, reduced the water vapor permeation to the corrosion of junction and temperature controller internal structure, reduced the ablation of the junction because of arc energy high, improved the stability of product.

This invention discloses a millable composite casing sub for side-drilling window opening, its preparation method, and its application. The millable composite casing sub comprises the following components: a matrix, a lubricating phase, and brittle phase reinforcing particles; the matrix is ​​an aluminum alloy matrix; the lubricating phase is graphite particles; and the brittle phase reinforcing particles are brittle mineral particles. During side-drilling window opening operations, an integrated hydraulic directional device is seated inside the lower steel casing below the casing sub. A gyroscope is used for precise orientation, and then a milling cone is lowered to perform side-drilling window opening. The sub body is milled using the milling cone to form the initial window. This invention, while ensuring the overall connection strength and sealing of the wellbore, locally alters the millability of the casing material at the planned window opening point. Through material and structural innovation, it replaces traditional steel casing, shortens the operation cycle, reduces the difficulty of milling operations, and extends the service life of the milling cone, thereby achieving high efficiency, low cost, and safety and reliability in window opening operations.

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.

A negative electrode material for a lithium-ion secondary battery includes: graphitic particles having a standard deviation of degree of circularity of from 0.05 to 0.10 in a range in which a cumulative frequency of degree of circularity from a lower degree of circularity is from 10% by particle to 90% by particle in a cumulative frequency distribution with respect to a degree of circularity obtained using a flow-type particle analyzer; and carbon particles having an average degree of circularity of 0.94 or less, the average degree of circularity being obtained using a flow-type particle analyzer.

The invention provides modified graphite and a preparation method thereof, a battery and an electric device, and belongs to the technical field of batteries. The battery comprises a negative pole piece, the negative pole piece comprises a negative pole film layer, the negative pole film layer comprises modified graphite, and the modified graphite comprises a graphite core, a carbonized asphalt layer coating at least part of the surface of the graphite core and a graphene layer coating at least part of the surface of the carbonized asphalt layer. The high-strength graphene layer is used as the outer layer of the modified graphite, so that the volume expansion of graphite particles in a graphite core when lithium ions are embedded can be limited, and the crushing and cracking of the graphite particles are reduced, thereby reducing the structural change and stress accumulation of the pole piece in the circulation process, further reducing the fracture and reconstruction of an SEI film, and improving the performance of the lithium ion battery. And the cycle stability and the service life of the battery can be improved. Therefore, the cycle performance of the battery can be improved.

A thermally conductive sheet containing a composition that contains graphite particles (A) and an organic polymer compound (B) which contains an acrylic ester-based resin containing a hydroxyl group in an amount of 0.010 mmol / g to 0.371 mmol / g and which has a weight average molecular weight of not less than 30,000, the graphite particles (A) being oriented in a thickness direction of the thermally conductive sheet is provided as a thermally conductive sheet that has high graphite binding capacity and excellent adhesion to an adherend.

This invention relates to the field of nanomaterials technology, and particularly to a pulsed high-current impact device for the cyclic mass production of high-purity graphene. The device includes a main unit, a quick-return six-bar linkage, a stirring and molding device, a pulsed high-current reaction device, and a graphite-graphene powder separation device. Graphite oxide powder is placed in the stirring and molding device, and a scraper presses the powder into graphite rods. A high-voltage moving electrode pushes the graphite rods into the pulsed high-current generator. The high current directly interacts with the large quantity of graphite, inducing a severe thermal stress effect (thermal expansion) within the graphite particles. This overcomes the van der Waals forces between the graphite layers, causing the graphite sheets to peel off in situ. The graphene is collected by the graphite-graphene powder separation device. Unreacted graphite and a small amount of substandard graphene are returned to the stirring and molding device for reuse. The entire preparation process is completed in a vacuum environment to obtain high-yield, high-purity graphene.

This invention discloses a carbon-doped device for gallium arsenide single crystal growth, applied in the field of single crystal growth. Utilizing the design of the insertion cavity and exhaust channel, particulate matter from the reaction interface is actively guided into the collection hood under the action of airflow and gravity, preventing stagnation and ensuring sufficient contact between the graphite column and the support disk interface. When the reactive gas enters the suddenly increased volume of the collection hood from the narrow insertion cavity, the flow rate drops sharply, thereby accelerating the sedimentation of particulate matter. Furthermore, the large surface area of ​​the inner wall of the collection hood can react and consume graphite particles and melt and adhere quartz particles, achieving wall-side trapping. Through the step-by-step action of the above steps, the particulate matter content in the gas entering the crystal growth zone is significantly reduced, improving crystal purity. In addition, the removal effect of stripped particles is further improved by using guide cylinders one and two, in conjunction with a porous quartz filter ring located inside the exhaust port.

The present invention aims to provide a novel carbon fiber having higher electrical conductivity. [Solution] The graphite-coated carbon fiber of the present invention is carbon fiber skeleton, Graphite particles covering the surface of the carbon fiber skeleton, and Carbonaceous binder that binds the graphite particles to the carbon fiber skeleton It has and When images were observed using a scanning electron microscope, the graphite particles covered 50% or more of the surface area of ​​the carbon fiber skeleton.

This invention discloses a method for producing 8011 aluminum alloy flat ingots using a graphite crystallizer, comprising the steps of graphite crystallizer preparation, smelting, casting, sawing, and milling. The graphite crystallizer uses graphite plates prepared by hot isostatic pressing, with a carbon mass fraction ≥99.9%, density 1.6–1.85 g / cm³, average graphite particle size <25 μm, thermal conductivity 80–130 W / (m·K), porosity 13–15%, and a graphite plate thickness of 10–20 mm and a height of 95–105 mm. The large-face water cavity of the crystallizer has a length of 2450–2550 mm and a height of 155 mm, while the small-face water cavity has a width of 500–670 mm and a height of 155 mm. The cooling water pressure is controlled at 0.25–0.50 MPa. This invention improves the production quality of 8011 aluminum alloy flat ingots, reduces the defect rate, extends the service life of the crystallizer, and increases production efficiency and product qualification rate by precisely optimizing the material and structural parameters of the graphite crystallizer and designing smelting, casting, sawing and milling processes that are compatible with 8011 aluminum alloy.

The present invention relates to a negative electrode comprising a negative electrode current collector and a negative electrode mixture layer disposed on the negative electrode current collector, wherein the negative electrode mixture layer contains a negative electrode active material including: artificial graphite particles; and an amorphous carbon coating layer disposed on the artificial graphite particles, the negative electrode active material includes 30-170 mg of elemental nitrogen and 600-1,000 mg of elemental oxygen per 1 kg of the negative electrode active material, and the negative electrode has an orientation index according to Equation 1 of 5-20.

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 graphite-coated carbon fiber according to the present invention has: a carbon fiber skeleton; graphite particles that cover the surface of the carbon fiber skeleton; and a carbonaceous binder that binds the graphite particles to the carbon fiber skeleton, wherein the graphite particles cover 50 area% or more of the surface of the carbon fiber skeleton when subjected to image observation with a scanning electron microscope.

A thermally conductive sheet containing a composition that contains graphite particles (A) and an organic polymer compound (B) which contains an acrylic ester-based resin containing a carboxyl group in an amount of 0.010 mmol / g to 0.410 mmol / g, the graphite particles (A) being oriented in a thickness direction of the thermally conductive sheet is provided as a thermally conductive sheet that has high graphite binding capacity and excellent adhesion to an adherend.

The utility model discloses a kind of roller type devices for graphite particle pre-crushing, belong to graphite particle pre-crushing field, and it includes side plate, the side plate is fixedly connected with transmission motor, the output shaft of transmission motor is fixedly connected with transmission roller column by coupling, the outer wall of transmission roller column is movably connected with conveyer belt, the side plate is fixedly connected with outer connection plate, the top of outer connection plate is fixedly connected with upper support frame, and the top of upper support frame is fixedly connected with upper motor;By setting side plate, transmission motor, transmission roller column, conveyer belt, outer connection plate, upper support frame, upper motor, rotating screw column, movable frame, roller motor, rotating shaft, bearing, roller column and limiting post, so that graphite particle pre-crushing roller type device can be broken into graphite particles of different sizes, reduce the demand for different types of roller type device, reduce the working complexity in work, improve the working efficiency in work.

The utility model provides a graphite crusher for lithium battery negative material, include: the rubbing device, screening device and switching device, screening device fixed mounting is in the inside of rubbing device, switching device includes the rotary disc, four pressure sensors, the rotary frame, four discharge gates, the discharge pipe and servo motor, the rotary disc rotation is connected in the inside of rubbing device, four pressure sensors all fixed mounting are in the inside of rotary disc, the rotary frame fixed mounting is in the top of rotary disc. The utility model provides a graphite crusher for lithium battery negative material, through the discharge pipe cooperation discharge gate, the graphite particle after screening is arranged to the inside of the collection box that places on the rotary disc, cooperate pressure sensor, servo motor and rotary frame simultaneously, after the inside storage of one collection box is full of graphite particle, carries out the automatic switching, thereby need not stop the rubbing of graphite to carry out the switching to the collection box, increases the work effect.

The present invention provides a method for manufacturing a gas diffusion layer substrate that has high normal permeability in the thickness direction, a low contact resistance per unit thickness, and a fuel cell that exhibits high power generation performance. [Solution] The present invention provides a method for manufacturing a gas diffusion layer substrate for fuel cells, comprising, in order: a water-containing sheet manufacturing step, which involves using a slurry containing carbon fibers, graphite particles having a particle diameter of 120 μm or more, fibrillated organic fibers that will be carbonized in a later carbonization step, and water to produce a water-containing sheet containing carbon fibers, graphite particles, and fibrillated organic fibers; a composite sheet manufacturing step, which involves squeezing the water from the water-containing sheet and drying it to produce a composite sheet; a resin impregnation step, which involves impregnating the composite sheet with a carbon precursor resin that will be carbonized in a later carbonization step to produce a resin-impregnated sheet; a compression step, which involves compressing the resin-impregnated sheet to produce a thin-walled sheet; and a carbonization step, which involves heating and firing the thin-walled sheet in a non-oxidizing atmosphere.

This application provides a negative electrode active material and its preparation method, a secondary battery, and an electrical device, relating to the field of lithium battery technology. The secondary battery includes a negative electrode sheet, which includes a negative electrode current collector and a negative electrode film layer located on at least one side of the current collector. The negative electrode film layer includes a negative electrode active material, which includes graphite particles. The graphite particles have an average sphericity of 0.65-0.95 and an average roundness of 0.42-0.65. The roundness of the graphite particles is represented by ri, which indicates the radius of curvature of the surface protrusions in the two-dimensional projection of the graphite particles, and R, which indicates the radius of the circumcircle of the two-dimensional projection of the graphite particles. This configuration effectively reduces the expansion of the secondary battery during cycling.

The application discloses a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer arranged on the surface of the negative electrode current collector; the negative electrode material layer comprises a negative electrode active material, the negative electrode active material comprises graphite, the graphite comprises primary graphite particles and secondary graphite particles; the unit of a crystal size La of the graphite is nm; the volume ratio of the secondary graphite particles in the graphite is a, the unit is %, and the D n50 of the secondary graphite particles is b, the unit is μm; La, a and b satisfy the relationship: 500≤La×a×b≤2600. By adjusting the specific synergistic relationship among the crystal size La of the negative electrode active material graphite, the secondary graphite particle size and the proportion of the secondary graphite particles, the battery can slow down the consumption rate of the film-forming additive and improve the cycle life of the battery on the basis of good cycle performance and kinetics.

An anode material includes silicon-based particles and graphite particles, wherein the average sphericity degree of the graphite particles is A, the average sphericity degree of the silicon-based particles is B, and A and B meet: 0<B−A≤0.3. The anode material has good cycle performance, and the battery prepared with the anode material has better rate performance and lower deformation rate.

A method for the continuous production of graphene. The method includes the steps of: flowing a suspension of graphite particles through a conductive open-cell porous material placed in a reaction vessel; applying a cathode potential to the conductive open-cell porous material, wherein the cathode potential is sufficient to exfoliate the graphene; and draining a suspension of exfoliated graphene from the conductive open-cell porous material.

The utility model relates to graphite particle screening technical field, and disclose a kind of particle fineness screening device for graphite crushing, including screening support platform, the top of screening support platform is equipped with vibrating screening frame, multiple vibration buffer springs are equipped between vibrating screening frame and screening support platform.The utility model, by operating vibrating motor, multiple screening filter screens can be driven, the mesh of multiple screening filter screens is sequentially smaller from top to bottom, so that multiple screening filter screens can be classified and screened according to the size of graphite powder particles, the effect of particle size classification screening is achieved, rubber bearing tube is correspondingly provided in the inside of screening filter screen and the bottom of vibrating screening cylinder, so that screening filter screen is not easy to damage driving stirring rod when vibrating, driving stirring rod can drive rubber stirring blade when rotating, and mixing, stirring, scraping and preventing blockage can be achieved, so that the device filter screen has good anti-blocking filtering effect, the particle size classification discharge capacity is excellent, the screening quality is high, and the use is convenient.

A process for purifying and producing coated high purity particulate graphite materials suitable for use in lithium-ion batteries (LiBs) is described herein. More specifically, the process comprises agglomerating a graphite feed or treating a graphite feed with an agglomerating agent to produce an agglomerated particulate graphite feed; and reacting the agglomerated particulate graphite feed in the presence of a chlorine-containing gas to produce a mixture comprising a purified agglomerated particulate graphite material and a chlorine-containing gas laden with chlorinated impurities. The process may further comprise an alkaline leaching step. A coated particulate graphite material comprising a purity in excess of 99.95 wt.% C. and its use as anode material in rechargeable LiBs is also disclosed.