438 results about "Graphite particle" patented technology

The invention belongs to the technical field of image data processing, and particularly relates to an automatic evaluation method and system for the metallographic spheroidization rate of a casting, and the method comprises the steps: constructing a global gradient field of a metallographic image of the casting; calculating a centripetal index by using a negative gradient vector and positioning a graphite particle physical center; determining a physical boundary based on the ratio of the tangential slip amount to the radial projection intensity on the ray path; obtaining a compactness index based on the consistency of the internal negative gradient vector and the radial direction; and the spheroidization score is calculated by combining the contour roundness and the compactness index, and the spheroidization rate is counted and output. According to the method, the problem that the internal crushing defect cannot be identified by the existing geometric scalar method is solved, and dual evaluation on the morphology and compactness of the graphite particles is realized.

A lithium-ion secondary battery having excellent discharge characteristics even in a low-temperature environment is provided. The lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes lithium cobalt oxide with a median diameter (D50) of greater than or equal to 1 μm and less than or equal to 12 μm. The lithium cobalt oxide contains magnesium in its surface portion. The negative electrode includes a graphite particle, a silicon particle, and a polymer including a carboxy group. The electrolyte solution contains a mixed solvent of a fluorinated cyclic carbonate and a fluorinated chain carbonate.

The invention provides a treatment method for recovering high-purity graphite from black powder leaching residues. The treatment method comprises the following steps: removing impurity elements in graphite from the black powder leaching residues in a Joule heat flash evaporation manner; the black powder leaching residues obtained after impurity removal are put into a ball mill, liquid phenolic resin is added, full mixing is conducted, and ball milling is conducted; and putting the ball-milled mixture into flash evaporation Joule thermal equipment, and carbonizing and graphitizing the phenolic resin to obtain regenerated graphite. According to the method, the temperature of the black powder leaching residues can be increased within an extremely short time, metal impurities in the black powder leaching residues are gasified, and impurities in graphite are removed. Phenolic resin is used for carbonization and graphitization, generated disordered carbon can fill up particle cracks in waste graphite and internal lattice defects, a conductive network among graphite particles is established, a compact carbon layer is formed on the surface of graphite, and graphite structure transformation can also be induced in the step. The regenerated graphite obtained by the method is similar to commercial graphite in capacity and good in cycling stability.

Battery device comprising a thermal insulation element and at least two battery cells arranged along a first direction, wherein the battery cell comprises an electrode assembly and electrolyte solution, the electrode assembly comprising positive electrode plates and negative electrode plates, the positive electrode plate comprising positive current collectors and positive film layers arranged on at least one side of the positive current collectors, the positive film layer comprising lithium phosphate, wherein the negative electrode plate comprises negative current collectors and negative film layers arranged on at least one side of the negative current collector, the negative film layer comprising graphite particles. characterized in that the electrolyte solution comprises fluorosulfonylimide salt, wherein the mass fraction of the fluorosulfonylimide salt in the electrolyte solution is 2% to 12%; wherein the battery cell comprises two first surfaces which are opposite each other along the first direction, wherein the thermal insulation element covers at least one of the two first surfaces and the dimension of the thermal insulation element along the first direction is 0.3 mm to 5 mm.

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 surface modified carbon negative electrode material, a preparation method thereof and a battery. The preparation method comprises the following steps: mixing a graphite carbon source and a pore-forming agent, and graphitizing the obtained mixture to form porous graphite; performing oxidation treatment on the porous graphite to prepare porous graphite oxide particles; the porous graphite oxide particles are placed in a tin source solution containing tin cations, the tin source solution is attached to the surfaces of holes of the porous graphite oxide particles, and tin oxide attached to the surfaces of the holes of the porous graphite oxide particles is formed based on the tin source solution; and the porous graphite oxide particles are placed in a carbon-containing reducing gas environment to be subjected to calcination treatment, and the carbon-coated tin nanowires are prepared on the basis of the tin oxide. According to the preparation method, the surface and holes of the carbon negative electrode material are modified by adopting the carbon-coated tin nanowires, so that the discharge performance of the battery at relatively high rate can be effectively improved.

An energy storage device according to an aspect of the present invention includes an electrode assembly in which a positive electrode including a positive active material layer and a negative electrode including a negative active material layer are stacked with each other with a separator interposed therebetween, in which the positive active material layer contains a positive active material particle, and the positive active material particle has an internal porosity of 15% or less, and the negative active material layer contains a graphite particle, and the graphite particle has an internal porosity of 2% or less.

The invention relates to the technical field of graphite negative electrode materials for lithium ion batteries, a surface coating layer structure of the graphite negative electrode material is finely designed to obtain a fast-charging graphite negative electrode material, the fast-charging graphite negative electrode material is provided with a core-shell structure, the core-shell structure takes graphite particles as an inner core, and the surface of the inner core is provided with a carbon coating layer with an ultra-micro pore structure; the pore opening diameter of the ultra-micro pore structure is 0.3-2.0 nm, the pore cavity diameter of the ultra-micro pore structure is 0.5-3.0 nm, and the pore opening diameter of the pore opening is smaller than the pore cavity diameter. A coating layer with an ultra-micro pore structure is introduced to the surface of the graphite negative electrode material, and the structural characteristics of pore cavities and pore openings in the ultra-micro pore structure are finely designed, so that the desolvation speed of lithium ions in an electrolyte on the surface of the material is increased, and the interface structure stability of the graphite negative electrode material can be effectively improved in the process; therefore, the fast charging performance and the cycle performance of the graphite negative electrode material can be effectively improved.

The invention discloses a negative electrode material, a negative electrode plate prepared from the negative electrode material, and a secondary battery, and belongs to the technical field of electrochemical energy storage. And the size of the silicon-carbon particles and the thickness of the coating layer are synchronously regulated and controlled based on the particle size difference of the graphite particles, so that the material not only can realize ideal cycle stability when being applied to the negative electrode material of the secondary battery, but also has excellent floating charge performance.

The invention discloses a negative pole piece and a secondary battery prepared from the negative pole piece, and belongs to the technical field of electrochemical energy storage, the negative pole piece takes a compound of silicon-based particles and graphite particles as an active material, and meanwhile, a coating layer containing lithium titanate is arranged on the surfaces of the graphite particles, so that the ionic crosstalk phenomenon of a traditional silicon-carbon negative pole is effectively avoided, the dynamic performance is excellent, and the service life is long. And ideal stability and fast charging performance can be realized when the lithium ion battery is applied to a secondary battery.

The utility model discloses a rotary device and epitaxial reaction furnace for epitaxial reaction, the rotary device includes the rotary base for supporting wafer tray, rotating mechanism and drive mechanism, rotating mechanism is connected with rotary base through a transmission mechanism and drives rotary base rotation, and drive mechanism is used for driving rotating mechanism rotation. Based on the rotary device, can avoid the graphite particle adhesion monocrystal substrate in epitaxial reaction process, reduces the defect quantity of monocrystal substrate, improves epitaxial layer growth quality.

One embodiment relates to a heat-conducting sheet containing graphite particles (A) including at least one selected from the group consisting of scale-like particles, ellipsoidal particles, and rod-like particles, the graphite particles (A) being oriented in a thickness direction, and a compression rate of thickness being 24% or more at a temperature of 150°C and a compression stress of 0.14 MPa.

The present invention provides a heat sink that is resistant to cracking even when force is applied to bend it, and has a uniform thermal conductivity in each direction in a plan view, as well as a method for manufacturing the same. [Solution] A heat sink 100 made of a sintered body of a graphite-copper composite material containing flake-shaped graphite particles 5 laminated via a copper layer, wherein the thermal conductivity in the direction perpendicular to the lamination direction of the flake-shaped graphite particles 5 is greater than the thermal conductivity in the lamination direction, characterized in that when the heat sink 100 is divided into four sections vertically and horizontally in a plan view, the lamination direction of the flake-shaped graphite particles 5 in the upper left section 11 and the lower right section 31 intersects with the lamination direction of the flake-shaped graphite particles 5 in the upper right section 21 and the lower left section 41. The intersection angle is preferably 60 to 90 degrees.

An anode material and a battery. The anode material includes graphite, an interior and / or a surface of the graphite has pores, a pore volume of the anode material is V (cm3 / kg), a specific surface area is S (m2 / g), a tap density is T (g / cc), wherein, 2≤V*S / T≤10. By constructing the ratio relationship of the specific surface area of the anode material, the pore volume and the tap density of the anode material, the overall distribution condition of defects such as pore pathways, crystal lattices and micro cracks in the graphite particles can be reflected. Within the limited range, when the anode material is made into an electrode to be applied to a battery, the defect distribution in the anode material is uniform.

The application provides a high-rate long-cycle natural graphite-based composite negative electrode material and a preparation method and application thereof. The natural graphite-based composite negative electrode material has the characteristics of high-rate performance, low volume expansion performance and long-cycle performance. Firstly, submicron flake graphite particles are granulated into particles with a pore structure in a form of spray granulation; then, heat treatment is performed under a protective atmosphere to convert pitch into amorphous carbon; then, chemical vapor deposition technology is adopted to uniformly distribute nano titanium in the pore structure between the submicron flake graphite inside the spherical graphite particles and on the surface of the spherical graphite particles; subsequently, the nano titanium is converted into titanium nitride through nitriding treatment, that is, titanium nitride is deposited in the pore structure between the submicron flake graphite inside the spherical graphite particles and on the surface of the spherical graphite particles, to prepare the natural graphite-based composite negative electrode material.

A negative electrode material for a lithium ion secondary battery, the negative electrode material being graphite particles satisfying the following formula (1). In formula (1), x is the average interplanar spacing (d002, in unit) of the graphite particles as determined by X-ray diffraction, and y is the crystallite size Lc (nm) of the graphite particles. 0.01 y+76.19 x < = 256.75 (1)

The present application belongs to the technical field of image data processing, and particularly relates to a method and system for automatically evaluating the spheroidization rate of a casting metallographic image, which comprises the following steps: constructing a global gradient field of the casting metallographic image; calculating a centripetal index and locating a physical center of a graphite particle by using a negative gradient vector; determining a physical boundary based on a ratio of a tangential slip amount to a radial projection intensity on a ray path; obtaining a compactness index based on the consistency of an internal negative gradient vector and a radial direction; calculating a spheroidization score in combination with a contour roundness and the compactness index, and statistically outputting the spheroidization rate. The present application solves the problem that the existing geometric scalar method cannot identify internal broken defects, and realizes double evaluation of the graphite particle morphology and compactness.

The invention provides a method for efficiently removing an SEI (solid electrolyte interface) membrane of a graphite negative electrode based on plasma activation combined with microbial degradation, which comprises the following steps: discharging and disassembling a waste lithium ion battery, separating a negative plate, crushing, screening and carrying out vortex separation on the negative plate to obtain enriched graphite particles coated with the SEI membrane; placing the graphite particles in a plasma reactor, and activating the graphite particles in a reactive atmosphere; placing the plasma-activated graphite particles in a bioreactor, mixing the plasma-activated graphite particles with a degrading bacterium solution, and carrying out microbial degradation to obtain a degradation product; and filtering, washing and drying the degradation product to obtain the regenerated graphite without the SEI membrane. The method can efficiently remove the SEI film on the surface of the graphite negative electrode, is green and environment-friendly, and protects the graphite structure.

The application discloses a kind of hydrophilic graphite oxide particle materials prepared by electrochemical method and application thereof, the hydrophilic graphite oxide particle material is prepared by the following method: S1, select graphite as anode, insert into electrolyte, electrolysis (electrochemical oxidation) is carried out under constant potential;S2, after electrolysis, the obtained electrolytic solution is filtered, and the filtrate is centrifuged, to obtain the hydrophilic graphite oxide particle material.The graphite particle material obtained by the application has the characteristics of reducibility, can be used for heavy metal wastewater treatment, and can reduce heavy metal ions and recover.The application uses green and environmentally friendly electrochemical oxidation method to prepare hydrophilic graphite oxide particles, the process flow is simple, there is no special material preparation site requirement, no secondary pollution, and the dispersibility of the prepared oxidizing graphite particles in aqueous solution is good, not easy to agglomerate, and has no toxic and harmful effect on the environment.

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.

The present application relates to a negative electrode excellent in rapid charging performance and life characteristics, and a secondary battery including the same, and relates to a negative electrode including a current collector and a negative electrode active material layer formed on the current collector, wherein the negative electrode active material layer includes a negative electrode active material including uncoated artificial graphite particles composed of secondary particles formed by aggregation of a plurality of primary particles, the average particle diameter (D 50 ) of the primary particles is 7 μm to 10 μm, the average particle diameter (D 50 ) of the secondary particles is 15 μm to 20 μm, and the uncoated artificial graphite particles have a crystal size La(100) of 200 nm to 300 nm in the a-axis direction and a crystal size Lc(002) of 50 nm to 100 nm in the c-axis direction at the time of XRD analysis.

The invention discloses a composite negative electrode material, a negative electrode plate, an electrochemical device and electronic equipment. The composite negative electrode material comprises graphite particles and silicon carbon particles, and the mass percent of the silicon carbon particles in the composite negative electrode material is 0-5%, and is not 0; the arithmetic average roughness Ra of the composite negative electrode material is 35 nm to 55 nm, and the rectangular factor R is 0.65 to 0.9. When the composite negative electrode material provided by the invention is applied to the lithium ion battery, the cycle performance of the lithium ion battery can be effectively improved.

A negative electrode material for a lithium ion secondary battery, which contains a plurality of graphite particles, and which is characterized in that: when an SEM image of a cross-section of each graphite particle is binarized into a void portion and a region other than the void portion, the void portion is set to 0, and the region other than the void portion is set to 1; a plurality of images of graphite particles having a number of pixels of 10,000 or more are selected from the images obtained by the binarization processing, and the average value of voids in the selected images of the graphite particles is 0.700-0.940.

The application discloses a lithium niobate-coated graphite composite negative electrode material and a preparation method and application thereof. x NbO y , wherein 0 ‑ 1 S / cm-10 ‑8 S / cm; the thickness of the lithium niobate is 0.01 nm-200 nm; and the lithium niobate-coated graphite composite negative electrode material is applied in a lithium ion battery, so that the rate performance of the lithium ion battery can be effectively improved, and the fast charging performance is improved.

To provide a nonaqueous electrolyte power storage element having a large output and a high capacity retention rate after a charge / discharge cycle.SOLUTION: A nonaqueous electrolyte energy storage device according to one aspect of the present invention includes a positive electrode containing lithium transition metal composite oxide particles and a negative electrode containing graphite particles, wherein the lithium transition metal composite oxide particles contain a nickel element, a cobalt element, and a manganese element, a content of the nickel element is 40 mol% or more and a content of the cobalt element is 30 mol% or more with respect to all metal elements other than the lithium element in the lithium transition metal composite oxide particles, a porosity due to closed pores of the lithium transition metal composite oxide particles is 15% or more, and a porosity due to closed pores of the graphite particles is 2% or less.SELECTED DRAWING: Figure 1

This invention discloses a carbon filler for blast furnace bottoms and its preparation method. The carbon filler comprises component A and component B; wherein: component A, by mass percentage, includes: 17-25% electrode graphite particles, 50-55% flake graphite, 20-26% electrode graphite powder, 3-5% flexible graphite, and 0.3-1% accelerator; component B includes thermoplastic phenolic resin and ethanol in a mass ratio of (4-6):(1-2); the amount of component B added is 19-22% of the weight of component A. The carbon filler is prepared by pre-mixing flake graphite and flexible graphite evenly, then mixing and stirring with a portion of component B, then adding electrode graphite particles, electrode graphite powder, and accelerator and mixing evenly, and finally adding the remaining component B and mixing evenly. The carbon filler obtained by this invention has good workability, thermal conductivity, and surface quality, increases the bonding performance between the material and the filling area, and effectively protects the furnace lining.

A fire retardant fabric includes a base fabric and expandable graphite particles secured to a surface of and / or embedded in the base fabric. The expandable graphite particles may be bonded or otherwise secured to the base fabric with an adhesive material. The fire retardant fabric may optionally include a web material over a surface of the base fabric to which the expandable graphite particles have been applied. Methods for manufacturing such a fire retardant fabric are also disclosed. Such a method may include applying expandable graphite particles and an adhesive material to a base fabric and, with the adhesive material, bonding or otherwise securing the expandable graphite particles to the base fabric.

The invention discloses a negative electrode material, a negative electrode plate and a secondary battery, and relates to the technical field of secondary batteries. The negative electrode material comprises graphite particles and is provided with holes, the shape coefficient delta of the holes is equal to (A1 + A2) / (B1 + B2), and delta is greater than 1; through TriStar II Plus software, the negative electrode material is analyzed by utilizing N2 (at) 77-Carb Finite Pores, As6, 3D-NLDFT model combination and N2 (at) 77-Carb Cyl Pores, SWNT and NLDFT model combination, a D-dV / dD curve A and a D-dV / dD curve B are obtained respectively, a first characteristic peak and a second characteristic peak exist in the curve A, and peak values of the first characteristic peak and the second characteristic peak are A1 and A2 respectively; a third characteristic peak and a fourth characteristic peak exist in the dV / dD curve B, and the peak values of the third characteristic peak and the fourth characteristic peak are B1 and B2 respectively. The negative electrode material has good electrochemical performance.

The utility model provides graphite refining and screening equipment, which relates to the technical field of graphite screening and comprises a screening box, a plurality of supporting legs are fixedly mounted on the bottom surface of the screening box, a discharge port is connected to the center of the bottom surface of the screening box in a penetrating manner, and a feeding port is connected to the top surface of the screening box in a penetrating manner. A control terminal is fixedly arranged on the surface of one side of the screening box, a through groove is formed in the surface of the other side of the screening box, a box door is connected to one end of the surface of the other side of the screening box through hinges, an arc-shaped plate is fixedly installed on the surface of one side of the box door, and a shaking assembly is arranged between the inner walls of the two sides of the screening box. A limiting assembly is arranged on the surface of one side of the shaking assembly. According to the graphite particle screening device, the half gear is matched with the two second racks to drive the arc-shaped screening frame to rotate in a reciprocating mode, so that graphite particles in the arc-shaped screening frame are driven to shake, and the situation that large graphite particles are accumulated on the surface of the arc-shaped screening frame, block the arc-shaped screening frame and affect the graphite particle screening efficiency is avoided.

Provided is a negative electrode that contains Si-containing particles and graphite particles, and causes less swelling when a secondary battery is repeatedly charged and discharged. The negative electrode of a secondary battery of the present disclosure includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector. The negative electrode active material layer includes a first layer located on a surface layer part side, and a second layer located on a negative electrode current collector side. The first layer contains first graphite particles and first Si-containing particles. The second layer contains second graphite particles and second Si-containing particles. An aspect ratio of the first Si-containing particles is larger than an aspect ratio of the second Si-containing particles. The aspect ratio of the first Si-containing particles is 4.0 to 10.0. The aspect ratio of the second Si-containing particles is 1.0 to 3.0.