159 results about "Flake graphite" patented technology

The invention belongs to the technical field of motor casing lost foam casting, and particularly relates to a special coating for a motor casing lost foam as well as a preparation method and application thereof. Through a quantitative formula design method, an aggregate proportion calculation formula based on thermal expansion coefficient matching and a grain size distribution correlation formula based on target air permeability, cooperative compounding of quartz powder and bauxite is achieved, and key functional components such as mullite, organic matter fibers and crystalline flake graphite are combined; the unification of high air permeability and excellent crack resistance of the motor shell lost foam coating is realized. The invention further provides a two-time coating gradient drying efficient process matched with the coating, and on the premise that the coating performance is guaranteed, the production efficiency is remarkably improved, and the energy consumption is reduced.

The invention relates to the technical field of electrode paste, in particular to a preparation method of high-pressure-resistant high-strength graphite enhanced electrode paste, which comprises the following steps: sequentially performing oxidation modification and silane modification on crystalline flake graphite powder, preparing silane modified graphite powder, and synchronously preparing a boron-nitrogen source precursor; coating the aminated carbon quantum dots with silicon to obtain silicon-coated carbon quantum dots; preparing a composite adhesive, a tungsten carbide-aluminum nitride composite reinforced phase and carbon-plated silicon powder; the preparation method comprises the following steps: blending and kneading silane modified graphite powder, a boron-nitrogen source precursor and other components, and pressing under gradient pressure to obtain a green body; and performing segmented roasting on the green body, and cooling to obtain the target electrode paste. According to the invention, crystalline flake graphite oxidation-silane modification is adopted to optimize interfacial compatibility, silicon-coated carbon quantum dots are adopted to reinforce a bonding system, a composite reinforcement phase is adopted to construct a mechanical support network, boron-nitrogen source in-situ doping supplemental reinforcement is adopted, and gradient pressure pressing and segmented roasting are combined to ensure that the structure is compact. The normal-temperature compressive strength, high-temperature mechanical stability and compactness of the electrode paste are improved through the synergistic effect of all links, and the electrode paste can stably adapt to the high-temperature and high-load working conditions.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention discloses a graphene aerogel modified elastic graphite material and a preparation method thereof, and the graphene aerogel modified elastic graphite material comprises the following components by mass: 50-80 parts of crystalline flake graphite; 8 to 15 parts of graphene aerogel; 3 to 8 parts of aminated modified boron-doped carbon nanotubes; 2 to 6 parts of hydroxyapatite-cerium oxide composite nano particles; 1 to 4 parts of a polyimide-montmorillonite nano composite material; 0.5 to 3 parts of titanate coupling agent modified nano silicon dioxide; 1-3 parts of a dispersant; 2-5 parts of a binder; the amination modified boron-doped carbon nanotubes can enhance the electrical conductivity and interface bonding force of the material, the hydroxyapatite-cerium oxide composite nanoparticles improve the high-temperature stability and mechanical toughness of the material, and the polyimide-montmorillonite nanocomposite improves the corrosion resistance and resilience durability of the material. And the titanate coupling agent modified nano silicon dioxide further optimizes the dispersion uniformity of all the components, and the comprehensive performance of the material is remarkably improved.

The invention provides a preparation method of an anti-sputtering high-density graphite material for an ion implanter, and relates to the technical field of graphite material preparation, and the preparation method comprises the following steps: mixing and modifying a reinforcing phase, matrix graphite powder and a silane coupling agent to obtain composite powder; the reinforcing phase is a compound system of silicon carbide nanowires and boron-doped diamond micro-powder; mixing the composite powder with a coal pitch binder, and molding by adopting a stepped low-speed curing process to obtain a carbon blank; the silicon carbide nanowires and the boron-doped diamond micro-powder are compounded to form a reinforcing phase and cooperate with the superfine crystalline flake graphite matrix to achieve performance complementation, the silicon carbide nanowires form a three-dimensional network supporting structure to hinder crack growth, and the boron-doped diamond micro-powder improves the surface abrasion resistance and reduces the sputtering yield; the silane coupling agent is matched to modify and reinforce interface bonding, so that the problems of performance limitation and interface stripping of a traditional single reinforced phase are solved, and the comprehensive anti-sputtering and anti-erosion performance of the material is remarkably improved.

The invention discloses a passive radiation-cold storage composite box body and a preparation method. The box body sequentially comprises a composite radiation film, a heat insulation layer and a cold storage layer from outside to inside. The outer-layer radiation film is composed of an elastic organic matrix and high-reflection inorganic particles such as barium sulfate, has high solar reflectivity and mid-infrared high emissivity, and can effectively restrain solar absorption and achieve radiation heat dissipation in the daytime. The heat insulation layer is made of XPS, EPS, aerogel felt and other low-heat-conduction materials so as to reduce external heat transfer. Phase change microcapsules are dispersed in the cold storage layer, and flake graphite and other high-thermal-conductivity fillers can be added to improve the cold transfer efficiency and temperature uniformity. And the phase-change material realizes automatic cold storage and cold release through a latent heat mechanism, so that the temperature in the box body is kept stable. Through the synergistic effect of radiation refrigeration, heat insulation and phase change cold storage, long-time and recyclable passive cold chain temperature control is achieved, and the device has the advantages of being simple and convenient in structure, high in cost performance, flexible in application, uniform in internal temperature distribution and the like.

This invention provides a temperature-resistant shape memory polymer plugging agent, its preparation method, and its application, belonging to the field of oil and gas drilling technology. The preparation method of this plugging agent includes the following steps: mixing acetic acid and perchloric acid to obtain a mixed acid, then adding bromate, potassium permanganate, and natural flake graphite, and stirring to obtain low-temperature expanded graphite; mixing cyanate ester, linear aliphatic epoxy resin, and an active diluent, then adding low-temperature expanded graphite, organotin compounds, and amine catalysts, and carrying out a curing reaction to obtain a temperature-resistant shape memory polymer material; testing the glass transition temperature (Tg) of the synthesized temperature-resistant shape memory polymer material, compressing it at (Tg+5)~(Tg+10)℃, and then cooling, pulverizing, and granulating to obtain the final product. The plugging agent of this invention can rapidly recover its original shape at high temperatures, accumulate and seal leakage channels, and form a high-strength sealing layer in fractures, meeting the requirements of safe and efficient drilling.

The invention discloses a preparation method of a modified graphite / copper composite heat sink material, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: carrying out acid activation on crystalline flake graphite, modifying the crystalline flake graphite with a silane coupling agent, and selectively stripping to obtain graphite nanosheets; preparing copper-based alloy powder containing at least two carbides of Zr, Cr and Ti; performing graded ultrasonic-ball milling composite dispersion on the surface modified graphite powder, the copper-based alloy powder, the nano-diamond powder, the carboxyl functionalized multi-walled carbon nanotubes and the graphene oxide; gradient filling cold pressing forming and pre-sintering are carried out; performing hot pressing / spark plasma sintering, applying a magnetic field or a vibration field to realize graphite orientation, generating a carbide interface transition layer in situ, and reducing graphene oxide; and after machining, pulse electrodeposition is carried out on the copper-graphene composite coating, and surface micropores / micro textures and phase change material filling can be selectively formed. The method is suitable for efficient heat management of high-power electronic devices.

The application discloses a method for regulating the dynamic performance of hot-pressing molding epoxy vitrimer composites by the V-shaped content of oriented fillers, uses flake graphite as the lamellar oriented filler, and uses the dynamically chemically cross-linked epoxy vitrimer as the resin matrix, so that the content of the lamellar oriented filler is changed by changing the single-layer thickness and the number of layers while keeping the total thickness unchanged, and the V-shaped regulation method of the dynamic performance of the hot-pressing molding anisotropic epoxy vitrimer composites is realized. The dynamic performance of the epoxy vitrimer composite presents a V-shaped change trend with the content of the lamellar oriented filler, which is completely different from the linear inhibition behavior of conventional fillers, and the application can be used for regulating the dynamic performance of the epoxy vitrimer by the V-shaped content of the oriented filler.

The invention belongs to the technical field of brake friction materials and powder metallurgy, and discloses a preparation and regulation method for a three-dimensional latticed structure in a copper-based brake friction material. The copper-based brake friction material is mainly composed of copper-coated iron powder, molybdenum disulfide, crystalline flake graphite, silicon dioxide, superfine copper powder and other functional components. Wherein the three-dimensional latticed structure is constructed by superfine copper powder, and the comprehensive performance of the copper-based brake friction material is improved through multiple excellent performances such as high heat conduction performance and mechanical strength of the three-dimensional latticed structure; according to the invention, structural design and preparation are carried out on raw material powder by adopting a method of prefabricated particle preparation and particle bonding and coating, so that all functional components are uniformly distributed on the friction material, a three-dimensional latticed structure can be constructed, and the mechanical property and tribological property of the friction material are greatly improved; the copper-based brake friction material is high in mechanical performance, stable in friction coefficient, high in heat conduction performance, low in wear rate and excellent in performance under extreme working conditions.

The invention belongs to the technical field of refractory materials, and particularly relates to an environment-friendly high-temperature-resistant refractory brick and a preparation method thereof. The environment-friendly high-temperature-resistant refractory brick is prepared from the following raw materials in percentage by weight: 12 to 15 weight percent of crystalline flake graphite, 8 to 12 weight percent of modified fly ash, 1 to 3 weight percent of zirconium oxide, 5 to 8 weight percent of composite binder and the balance of magnesium oxide, the modified fly ash is prepared by the following preparation processes: adding fly ash into a nitric acid solution, stirring, filtering, washing and drying to obtain active fly ash; adding the active fly ash, a surfactant and scandium chloride into water, adjusting the pH value at 50-60 DEG C, standing, filtering, washing and drying to obtain scandium modified fly ash; ball-milling and mixing the scandium modified fly ash, lime slag and triethanolamine, and calcining to obtain the modified fly ash. The refractory brick disclosed by the invention has excellent compression strength, high-temperature fracture resistance and excellent oxidation resistance.

The present application relates to the technical field of graphite material, and provides a method for preparing high-expansion-volume expanded graphite by activation or pretreatment. In the method, natural flake graphite, potassium permanganate, concentrated sulfuric acid and an activating agent are mixed to perform an oxidation intercalation reaction, and then high-expansion-volume expanded graphite is obtained by high-temperature expansion. Alternatively, in the method, natural flake graphite is pretreated by a pretreatment agent, and then an oxidation intercalation reaction and high-temperature expansion are performed to obtain high-expansion-volume expanded graphite. By activation or pretreatment, the method can improve the expansion volume of expanded graphite. In particular, when the pretreatment method is used, the method can prepare expanded graphite with significantly increased expansion volume on the basis of reduced use of oxidizing agent and intercalating agent, and the expansion effect is more significant.

The present application provides a kind of negative electrode for reducing the initial resistance of non-aqueous electrolyte secondary battery and achieving the improvement of durability.The negative electrode for non-aqueous electrolyte secondary battery disclosed herein has a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, and the negative electrode active material layer at least contains a first negative electrode active material and a second negative electrode active material.The first negative electrode active material is composed of agglomerates of flaky graphite coated with low-crystallinity carbon on at least part of the surface, and the interlayer distance of graphite of the low-crystallinity carbon based on the electron diffraction image obtained by transmission electron microscopy is 0.3375 nm.The second negative electrode active material is natural graphite or artificial graphite with an interlayer distance of graphite based on the electron diffraction image obtained by transmission electron microscopy of 0.3375 nm.Here, the mass ratio of the first negative electrode active material to the second negative electrode active material is 50:50 to 90:10.

The application provides a net forming method of Ti / Ti laminated material, comprising the following steps: step S1, uniformly mixing flaky graphite powder and titanium alloy raw materials of different sizes, then smelting to obtain an ingot, forging and rolling the ingot into a rod, and then using a plasma rotating electrode atomization method to prepare the rod into TiC composite (alpha+beta) titanium alloy powder; step S2, drying industrial pure titanium, TiC composite (alpha+beta) titanium alloy and (alpha+beta) titanium alloy powder, preheating a substrate, and under an argon protective atmosphere, sequentially laser melting and depositing the industrial pure titanium layer, the TiC composite (alpha+beta) titanium alloy layer, the (alpha+beta) titanium alloy layer and the TiC composite (alpha+beta) titanium alloy layer on the substrate from bottom to top; step S3, repeating step S2 at least four times to obtain a formed piece, and annealing to obtain a laminated material. Through the construction of the industrial pure titanium / TiC composite (alpha+beta) titanium alloy / (alpha+beta) titanium alloy laminated structure, the final Ti / Ti laminated material has medium-high strength and high impact toughness.

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.

This invention discloses a preparation process for fire mortar used in magnesia-carbon brick masonry, relating to the field of refractory materials. The fire mortar comprises the following raw materials in parts by weight: 35-45 parts magnesia granules, 10-20 parts fine magnesia powder, 5-10 parts lightly calcined magnesia, 10-12 parts modified graphite, 7-9 parts modified furan resin, 1-1.5 parts silica powder, 2-3 parts aluminum powder, 0.5-0.7 parts carbon fiber, 1.4-1.8 parts curing agent, and 5-7 parts diluent. The synthesized modified graphite is a grafted composite of nano-titanium dioxide containing ether bonds and furan rings and zirconium carbide-coated flake graphite. The synthesized modified furan resin is obtained by dehydrating furan resin with an alcohol hydroxyl product containing fluorenone, thioether, and naphthaniline. The fire mortar of this invention exhibits excellent room temperature / high temperature flexural bonding strength and thermal shock resistance, and has a long service life.

This application relates to the technical field of plastic coloring, and in particular to a low-gelling carbon black polymer and its preparation method. The low-gelling carbon black polymer comprises the following raw materials in weight percentages: HDPE 5-15%, carbon black 10-40%, carbon nanotubes 3-7%, flake graphite 1.5-4%, processing aids 1-4%, antioxidant 0.2-0.6%, with the balance being mLLDPE. The carbon nanotubes are a mixture of short-tube and long-tube MWCNTs. The average diameter of the short-tube MWCNTs is 8-15 nm, and the average length is 5-20 μm. The average diameter of the long-tube MWCNTs is 20-50 nm, and the average length is 100-300 μm. The flake graphite is micron-sized flake graphite. It has the advantage of reducing "gelling" during the later storage process of the carbon black polymer.

The application relates to the cable field and particularly discloses a mine rubber-sheathed cable insulation shielding material and a preparation method thereof. The insulation shielding material comprises the following raw materials in parts by weight: chlorinated polyethylene 100 parts; conductive carbon black 37-40 parts; graphene 1-2 parts; flake graphite powder 3-6 parts; plasticizer 25-30 parts; light magnesium oxide 6-10 parts; calcium stearate 1-2 parts; antioxidant 1-2 parts; calcium hydroxide 3-5 parts; vulcanization cross-linking system 7-9 parts; polyethylene wax 1-2 parts; peeling regulation component, which comprises 3-4 parts of polytetrafluoroethylene superfine powder, 2.5-3.5 parts of shellac and 1.5-2.5 parts of fluorosilicone oil. The preparation method comprises the following steps: raw material pretreatment; and sectional temperature control mixing. The insulation shielding material has the advantages of excellent processing technology, conductive performance and stable controllable peelable interface between the insulation shielding material and the ethylene-propylene insulation layer.

Disclosed are a high-performance natural graphite negative electrode material, a preparation method therefor, and a use thereof. In the negative electrode material of the present invention, a uniform and thin amorphous carbon layer coated on surfaces of each curled flake graphite layer inside the natural graphite in a core can prevent organic molecules in an electrolyte from penetrating into spherical graphite during charging and discharging to generate a new SEI film, thereby preventing delamination of the curled graphite layers inside the spherical graphite; sulfonated graphene in the inner shell has good flexibility, which can alleviate the volume expansion of natural graphite during charging and discharging, improving the cycling performance of natural graphite up to 1500 cycles. An outermost amorphous carbon layer can reduce the specific surface area of the inner sulfonated graphene, preventing reduction of first-cycle efficiency of a lithium-ion battery caused by the graphene coating. In the natural graphite negative electrode material of the present invention, the amorphous carbon layer is uniform and thin, and does not reduce the tapped density and gravimetric capacity of the anode material.

This invention relates to the field of flow battery technology, specifically disclosing a flexible graphite bipolar plate with high surface conductivity, its preparation method, and its application. The preparation method includes the following steps: (1) chemically and thermally treating flake graphite to obtain expanded graphite sheets; (2) spraying a PEDOT:PSS solution onto the first layer of expanded graphite sheets, then laying a second layer of expanded graphite sheets, and pre-pressing to obtain an EG-PEDOT:PSS composite material; (3) impregnating the EG-PEDOT:PSS composite material with an epoxy resin solution, and performing water bath curing and drying treatment to obtain a PEDOT:PSS-EG-EP composite material; (4) using a hot-pressing molding process to obtain a flexible graphite bipolar plate with high surface conductivity. This invention improves the overall conductivity of the graphite bipolar plate and enhances the energy storage efficiency of flow batteries.

The invention discloses a curled spheroidized silicon-carbon composite negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion batteries, the curled spheroidized silicon-carbon composite negative electrode material is spherical, and comprises: a shell, the shell is composed of curled flake graphite and nanometer silicon coating the surface of the shell, the curled flake graphite is obtained by tabletting, curling and spheroidizing flake graphite; the inner core is composed of non-curled flake graphite and nanometer silicon coated on the surface of the inner core, the non-curled flake graphite is obtained by tabletting flake graphite, the dispersing agent is used for improving the dispersity, the flake graphite is selected, and shaping is carried out after coating so as to further improve the binding force, improve the conductivity and relieve the silicon expansion problem; and meanwhile, the stability of the SEI layer is improved.

The present invention relates to a method for preparing an anode active material and a secondary battery including the anode active material. The anode active material may be prepared by a method including the steps of: obtaining byproduct particles that have not been spheroidized in a step of pulverizing and spheroidizing flaky graphite particles; preparing coated particles by mixing the graphite byproduct particles with composite particles and performing a mechanochemical reaction thereon to coat the surface of the graphite byproduct particles with the composite particles; and spheroidizing the coated particles and coating the surface thereof with amorphous carbon to prepare spherical graphite.

The application provides a fast-charging silicon-carbon composite material and a preparation method thereof, a lithium ion battery and an electric device, and relates to the field of new energy. A first mixture obtained by mixing silicon nanoparticles, a first conductive agent and flake graphite is subjected to spheroidization treatment to obtain a first intermediate product; the first intermediate product is subjected to ultrasonic treatment and airflow classification to obtain a second intermediate product; a second mixture obtained by mixing the second intermediate product and a first binder is subjected to hot isostatic pressing treatment to obtain a third intermediate product; the third intermediate product is subjected to graphitization treatment under a nitrogen atmosphere to obtain a fourth intermediate product; the fourth intermediate product is subjected to surface coating by using a polymer precursor to obtain a fifth intermediate product; and the fifth intermediate product is subjected to carbonization treatment under an inert atmosphere to obtain the fast-charging silicon-carbon composite material; and the polymer precursor comprises a second conductive agent and a second binder. The method is simple to operate and raw materials are easy to obtain.

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 application discloses a PTC effect electrothermal film and a preparation method and application thereof. The composition of the PTC effect electrothermal film comprises a film base material, an electrothermal layer with a PTC effect, a conductive circuit and a circulating relay. The composition of the electrothermal layer with the PTC effect comprises nano-silicon hybrid resin, flaky graphene, a heat-sensitive material, a conductive agent and an additive. The electrothermal layer with the PTC effect is covered on one side or two sides of the film base material. The circulating relay is arranged in the conductive circuit. The preparation method of the PTC effect electrothermal film comprises the following steps: 1) preparing an electrothermal slurry; 2) coating the electrothermal slurry on the surface of the film base material to dry and form a film, and then arranging the conductive circuit, the circulating relay and a temperature sensor according to needs, so that the PTC effect electrothermal film is obtained. The PTC effect electrothermal film has the advantages of no overheating problem, low energy consumption, long service life and the like, and has a wide application prospect.

The present application relates to the technical field of carbon composite materials, and particularly relates to a preparation method of a composite graphite crucible for sintering of a lithium iron manganese phosphate positive electrode material. The present application aims to solve the problems of poor thermal conductivity, easy thermal shock cracking and high-temperature deformation of traditional refractory castable crucibles. In the method, silica anchor points are constructed on the surface of dopamine site-modified single-walled carbon nanotubes and terminated with silane, and then the silica anchor points are compounded with phenolic resin and boric acid. Finally, the mixture is kneaded, hot-pressed and carbonized in batches with flake graphite of a specific particle size. The prepared composite graphite crucible significantly improves the thermal conductivity, structural stability and thermal shock resistance, optimizes the microstructure uniformity, thereby effectively reducing the sintering energy consumption and greatly prolonging the service life of the crucible in continuous production.

The invention discloses a method for preparing few-layer graphene through supercritical CO2 stripping, and belongs to the technical field of graphene preparation. The preparation method comprises the following steps: mechanically crushing natural crystalline flake graphite, and carrying out airflow classification purification to obtain graphite powder with the particle size of 50-100 mu m; the method comprises the following steps: mixing graphite powder and a bio-based anionic surfactant, adding the mixture into a supercritical reaction kettle, and introducing CO2 to replace air; carrying out constant-temperature and constant-pressure pretreatment under the conditions that the temperature of the reaction kettle is 40-60 DEG C and the pressure is 2-4MPa, increasing the pressure to 15-20MPa, and carrying out stirring reaction for 2-3h; and after the reaction is finished, slowly releasing the pressure to normal pressure, carrying out centrifugal classification on the product, washing to be neutral, and carrying out vacuum freeze drying to obtain the few-layer graphene. The problems that an existing supercritical CO2 stripping process is poor in environmental protection property, products are prone to agglomeration and low in efficiency are effectively solved, the number of layers of the products is 1-5, the proportion of 1-3 layers is larger than or equal to 75%, the sheet diameter is 0.8-2.0 micrometers, and the method has the advantages of being high in crystallinity and low in defect density; in addition, according to the method, the CO2 recycling rate is larger than or equal to 95%, the stripping efficiency reaches 85% or above, cost is low, and the method is suitable for large-scale industrial production.

The application relates to a preparation method of a high-performance carbon-silicon composite negative electrode material with a cell-like structure and application of the high-performance carbon-silicon composite negative electrode material with the cell-like structure. The application relates to a carbon-silicon composite negative electrode material and a preparation method thereof. The application aims to solve the problems of low specific capacity, poor cycle performance and large charge-discharge volume change of existing lithium ion battery negative electrodes. The method comprises the following steps: one, ball milling; two, preparation of a nano-silicon suspension; three, preparation of flake graphite primary-coated graphite carbon-silicon composite material; four, ball milling, sieving and secondary heating carbonization treatment, so that the high-performance carbon-silicon composite negative electrode material with the cell-like structure is obtained. The high-performance carbon-silicon composite negative electrode material with the cell-like structure is used as a lithium ion battery negative electrode material. The initial discharge specific capacity of the high-performance carbon-silicon composite negative electrode material with the cell-like structure prepared by the application can reach 1650 mAh / g, the discharge capacity can be kept above 800 mAh / g after 300 cycles, and the coulombic efficiency can be stabilized above 99%.

This application discloses a secondary battery and an electrical device, relating to the field of battery technology. The secondary battery provided by this application selects flake graphite and hard carbon as the negative electrode active materials, and defines the hard carbon as being located within the pores formed between adjacent flake graphite particles, and the hard carbon comprising secondary aggregates of multiple primary particles with porous connecting interfaces between adjacent primary particles; this effectively improves ion / electron conductivity, enhances the wettability and degree of the negative electrode sheet to the electrolyte; thereby effectively improving the first-cycle coulombic efficiency, fast-charging capability at high rates, and cycle safety performance of the secondary battery.

The invention discloses a method for simultaneously preparing graphene and two-dimensional diamond, which comprises the following steps: adding single-crystal crystalline flake graphite powder and a high polymer into a ball-milling tank, ball-milling and uniformly mixing, tabletting the obtained mixed powder, and pressing in a cubic press to obtain the graphene and the two-dimensional diamond, according to the method, the stable graphene and the two-dimensional diamond which are large in size are obtained, the prepared graphene and the prepared two-dimensional diamond do not contain impurities and are high in purity, and the method has important significance on development of research on physical and chemical properties of the graphene and the two-dimensional diamond and implementation of application of the graphene and the two-dimensional diamond.