307 results about "Carbon composites" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

This application relates to a silicon-carbon composite anode material, its preparation method, and its application. The silicon-carbon composite anode material has a core-shell structure, comprising, from the inside out: a core, which is a silicon-carbon composite matrix; an intermediate shell, which is a rigid tungsten nitride layer covering the outer surface of the silicon-carbon composite matrix; and an outer shell, which is a flexible conductive carbon layer covering the outer surface of the intermediate shell. This application proposes using tungsten nitride (W2N) as the inner rigid coating material to form a high-strength, conductive W2N protective layer on the surface of the silicon-carbon composite material, and further coating it with a flexible conductive carbon layer, constructing a "hard shell-soft layer" dual-layer synergistic protection structure, thereby systematically alleviating the key technical challenges of the aforementioned silicon-based anodes.

A negative electrode active material, a secondary battery and an electrical apparatus. The negative electrode active material includes a silicon-carbon composite material, where the silicon-carbon composite material includes a first silicon-carbon composite particle and a second silicon-carbon composite particle; the first silicon-carbon composite particle includes a first carbon matrix having a pore structure and a first silicon-based material arranged in the pore structure of the first carbon matrix; the second silicon-carbon composite particle includes a second carbon matrix having a pore structure and a second silicon-based material arranged in the pore structure of the second carbon matrix; and a mass percentage content of a silicon element in the first silicon-carbon composite particle is greater than a mass percentage content of a silicon element in the second silicon-carbon composite particle.

A silicon-carbon composite material, a secondary battery, and an electronic device are disclosed. The differential capacity-voltage curves of the silicon-carbon composite material during lithium delithiation exhibit characteristic peaks in the 250mV to 300mV and 600mV to 750mV ranges, respectively. The peak height 'a' of the 600mV to 750mV characteristic peak and the peak height 'b' of the 250mV to 300mV characteristic peak satisfy the condition: 0.35 ≤ a / b ≤ 0.4. The silicon-carbon composite material satisfying the above characteristic peak height ratio exhibits high specific capacity, good initial coulombic efficiency, cycle performance, expansion performance, and rate performance, effectively improving the energy density, cycle performance, and rate performance of the secondary battery.

The application relates to the field of electrochemical energy storage technology, and provides a composite positive electrode based on metal phthalocyanine and iodine synergic oxidation and reduction, a preparation method and a battery. The preparation method of the composite positive electrode based on metal phthalocyanine and iodine synergic oxidation and reduction comprises the following steps: mixing and grinding iodine monomer and a carbon carrier, sealing and heating, and preparing iodine monomer loaded carbon composite material; weighing the iodine monomer loaded carbon composite material, metal phthalocyanine, a conductive agent and a binder to prepare positive electrode slurry; coating the positive electrode slurry on the surface of a current collector, drying, and obtaining the composite positive electrode. The application constructs a metal center of metal phthalocyanine and an iodine double oxidation and reduction synergic positive electrode. The preparation method of the application further introduces metal phthalocyanine into the iodine monomer loaded carbon composite material, so that the iodine species and the metal center of the metal phthalocyanine jointly serve as a positive electrode oxidation and reduction reaction unit. The iodine species participates in I ‑ / I 0 / I + multi-electron conversion, the metal center of the metal phthalocyanine participates in the valence change reaction, and the two jointly constitute a double oxidation and reduction system.

The present application relates to the field of polyurethane, in particular to a kind of fluorine-free high-efficiency carbon-forming flame-retardant polyether polyurethane and preparation method thereof.Flame-retardant polyether polyurethane includes the following components by mass fraction: thermoplastic polyether polyurethane matrix 75-87 parts, halogen-free fluorine-free catalytic carbon composite flame retardant 13-18 parts, functional additive 0-5 parts.The present application realizes high-efficiency flame retardation under very low addition amount through synergistic effect of phosphorus-nitrogen flame-retardant system and catalytic carbon system, only 13-18 parts of flame retardant addition amount is needed, 0.5-3.0mm wall thickness product can reach UL1581 VW-1 highest flame-retardant grade, completely no dripping, solve the industry pain point of traditional halogen-free flame-retardant system high addition amount, thin-wall flame-retardant substandard, rely on fluorine-containing additive anti-dripping, perfect adaptation to the flame-retardant demand of thin-wall product such as electric wire and cable.

The application discloses a kind of coal-based carbon, carbon nanotube and carbon fiber synergic coated silicon-carbon composite material and its preparation method and application, prepare according to the following steps: (1) coal powder is mixed with multi-walled carbon nanotube, chopped carbon fiber to obtain composite powder;(2) preparation of gel granulator, (3) preparation of composite porous carbon sphere, (4) silicon source is dissolved in toluene, add aluminium chloride, then composite porous carbon sphere is immersed in silicon source catalytic solution, and static adsorption;(5) the mixture after adsorption is separated by suction filtration, dried, to obtain composite silicon-carbon sphere precursor, reduction sintering, (6) the primary silicon-carbon composite material is crushed and classified to obtain fine powder, impurity removal, activation sintering is obtained.The application utilizes the characteristics of high carbon content of coal, prepares active porous material, and further loads nano-silicon on the skeleton by liquid phase adsorption and reduction method, and finally utilizes carbon nanotube and carbon fiber to obtain high-performance composite silicon hard carbon negative electrode.

This invention relates to the field of secondary battery technology, specifically to a silicon-carbon composite material, its preparation method, and a lithium-ion battery. The preparation method of the silicon-carbon composite material includes: reacting an organometallic framework ZIF-8 in a saturated metal salt solution and then evaporating and crystallizing it to obtain a metal salt-coated organometallic framework Salt@ZIF-8; pulverizing a silicon-copper alloy precursor and the Salt@ZIF-8 at a mass ratio of 1:0.05-0.7 to obtain a mixed powder; and subjecting the mixed powder to a pyrolysis reaction and acid leaching treatment to obtain the silicon-carbon composite material. The silicon-carbon composite material obtained by this invention exhibits excellent structural stability and electrochemical performance, effectively mitigating the volume expansion of the silicon anode and improving cycle performance and rate performance.

This invention belongs to the field of battery active materials technology, specifically disclosing a silicon-oxygen-carbon composite material, its preparation method, and a secondary battery. The silicon-oxygen-carbon composite material is prepared using silicon powder, a carbon source, and an oxygen-generating agent as raw materials via a one-pot, single-step synthesis method, comprising the following processes: heating to a first preset temperature, decomposing the oxygen-generating agent to produce oxygen, oxidizing the silicon on the surface of the silicon particles to form a silicon oxide coating layer, and obtaining Si@SiO. x Particles, 0.5≤x≤2; heated to the second preset temperature, in the Si@SiO x A carbon coating layer is formed on the surface of the particles to obtain the silicon-oxygen-carbon composite material. This invention achieves this by forming a tightly wrapped SiO2 layer on the surface of silicon particles. x The thin film of the silicon layer and the carbon layer effectively buffers the volume expansion of silicon particles during the charging and discharging process, improves the conductivity of the silicon anode, and effectively avoids the side reaction between silicon particles and electrolyte. As an anode material, it exhibits considerable lithium storage capacity and excellent electrochemical performance.

The application discloses a low-smoke halogen-free insulating material and a preparation method and application thereof, and relates to the field of cable materials. The low-smoke halogen-free insulating material comprises ethylene-vinyl acetate copolymer, polyethylene, modified flame retardant, polydopamine-coated ceramic oxide, antioxidant, crosslinking agent and processing aid, and the modified flame retardant is a flame retardant treated by bis(dioctyloxyphosphato) ethylene titanate. The application uses the modified flame retardant with low filling amount and the polydopamine-coated ceramic oxide to synergistically improve the flame-retardant and smoke-suppressing performance of the insulating material. The modified flame retardant is decomposed to generate oxides under heat to form an oxygen-blocking dense physical barrier. The polydopamine-coated oxides are heated to form a tough and stable heat-insulating ceramic-carbon composite layer. The modified flame retardant with low filling amount improves the compatibility and processing performance of the matrix, and comprehensively improves the flame retardation and mechanical strength of the material.

The application relates to the technical field of lithium ion battery negative electrode materials, and discloses a graphitized porous silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The silicon-carbon negative electrode material comprises a core and a carbon coating layer coated on the outer surface of the core, and is characterized in that the core comprises an inner layer and a superficial layer from inside to outside, the silicon-carbon negative electrode material has gradiently distributed pores in the inside, and the porosity decreases from inside to outside along the inner layer, the superficial layer and the carbon coating layer; and the core comprises a silicon-carbon composite, the silicon-carbon composite comprises nano silicon particles, a conductive agent and graphitized carbon material. The graphitized silicon-carbon negative electrode material can solve the problems of easy cracking and rate reduction of the porous structure.

This invention provides a functional current collector, its preparation method, and its application, belonging to the field of battery materials technology. The functional current collector comprises a stacked metal layer, a metal-carbon composite layer, and a carbon layer. Starting from the material and structural design of the functional current collector, this invention introduces a metal-carbon composite layer between the carbon layer and the metal layer. This not only reduces the amount of metal used and increases energy density but also enhances mechanical properties, achieving excellent flexibility and tensile strength. Furthermore, the metal-carbon composite layer significantly reduces interfacial resistance and improves the adhesion between the carbon layer and the metal layer. In addition, the metal-carbon composite layer exhibits good resistance to electrolyte corrosion, improving the stability of each interface and ensuring good structural stability of the functional current collector, thus enhancing its stability during battery use. The bipolar battery prepared based on this method exhibits excellent cycle performance.

The application discloses a silicon-oxygen-carbon composite material and a preparation method thereof, a negative electrode raw material, a negative electrode sheet and a lithium ion battery, and belongs to the field of electrode materials. The silicon-oxygen-carbon composite material comprises a core and an outer layer, and the outer layer comprises a carbon coating layer and a plurality of carbon protrusions. The core is a silicon-oxygen material doped with a metal. The carbon coating layer is coated outside the core, and the plurality of carbon protrusions are formed on the outer surface of the carbon coating layer. The silicon-oxygen-carbon composite material disclosed by the application can significantly improve the reversible capacity, the initial efficiency, the rate performance and the cycle stability of the lithium ion battery based on the synergistic effect of the metalized core, the carbon coating layer with uniform thickness and the plurality of carbon protrusions distributed outside the carbon coating layer.

The present invention relates to the technical field of the preparation of materials and aims to solve the problems of interface separation and relatively weak oxidation resistance under complex working conditions caused by insufficient interfacial bonding force of existing carbon / carbon composite materials. To this end, the present invention provides a carbon / carbon composite material and a preparation method therefor. The carbon / carbon composite material comprises, in mass percentages, 40-55% of polyacrylonitrile-based carbon fibers, 10-25% of pitch-based carbon fibers, 8-20% of nano silicon dioxide-grafted carbon fibers, 8-20% of bio-pitch, 8-15% of a nanographene-modified phenolic resin, 3-6% of silicon carbide whiskers, 2-4% of zirconium boride nanoparticles, 2-4% of graphitized carbon fibers, and 1-3% of a natural plant extract antioxidant. The carbon / carbon composite material of the present invention can provide stable interfacial bonding force and significant oxidation resistance, thereby ensuring the structural integrity and mechanical property stability of the material when subjected to a variety of complex stresses such as tension, compression, bending, and shear, and broadening the application range of the material in the field of high-temperature oxidation resistance.

This invention discloses a silicon-carbon composite material, its preparation method, and a lithium-ion battery, belonging to the field of lithium-ion battery material technology. The silicon-carbon composite material includes a core comprising a modified graphite carbon matrix and silicon material formed in the pores and surface of the modified graphite carbon matrix; and a coating layer formed on the surface of the core, the coating layer being a carbon layer. This invention uses modified graphite as the carbon matrix, with silicon material embedded in the pores and surface of the graphite. A first-phase carbon source and a second-phase carbon source synergistically coat the core to form a double-layer carbon coating structure, effectively improving the conductivity of the silicon-carbon composite material, suppressing the volume expansion of silicon material during the charging and discharging process of the lithium-ion battery, and improving the structural stability of the silicon-carbon composite material. When applied to lithium-ion batteries, the silicon-carbon composite material of this invention can effectively reduce expansion and improve rate performance and cycle stability.

A cooling and molding apparatus for carbon-carbon composite materials relates to the field of composite material manufacturing technology, addressing the problem in existing technologies where precise control of cooling temperature is difficult, easily leading to stress concentration within the carbon-carbon composite material. The apparatus includes a cooling cylinder with a cover at its top, the top of which is connected to a gas storage cylinder via a gas supply pipe. An inlet pipe and an outlet pipe are fixedly connected to the outside of the cooling cylinder. The inlet pipe is connected to a cold water tank via an inlet pump, and the outlet pipe is connected to a first water storage tank via an outlet pump. Both the cold water tank and the first water storage tank are housed within the machine body, which also contains a second water storage tank. A main control device is connected to the side wall of the machine body. The advantages are: it allows the cooling process to be divided into multiple stages and dynamically adjusts the cooling water flow rate, avoiding stress concentration during the cooling process.

The application discloses a kind of low-carbon composite cementitious material for deep foundation pit engineering and preparation method thereof, belong to building material technical field.The low-carbon composite cementitious material for deep foundation pit engineering, including following weight parts raw materials: 70-90 parts of slag, 5-10 parts of cement, 10-30 parts of phosphogypsum, 5-20 parts of modified secondary aluminum ash, 2-10 parts of modified 5A zeolite, 5-10 parts of organic curing agent, 1-5 parts of carbide slag, 0.03-0.2 parts of alcohol amine early strength agent, 0.5-8 parts of potassium dihydrogen phosphate, 2-8 parts of magnesium oxide, 2-3.5 parts of acid activator, 20-50 parts of water, by making full use of industrial waste slag, secondary aluminum ash, carbide slag, phosphogypsum, reduce resource waste and environmental pollution, convert industrial solid waste into environmental protection building material, realize the diversification of product, functionalization, green, can replace traditional reinforced concrete material, significantly reduce the carbon emission in deep foundation pit engineering, help building industry low-carbon transformation.

This invention discloses an intelligent design and preparation method for low-cement-content sprayable engineering cement-based low-carbon composite materials, belonging to the field of composite material mix design. The method includes: constructing a multi-objective genetic optimization intelligent framework integrating raw material performance and carbon emission data to collaboratively optimize mechanical properties, workability, and low-carbon targets during the design phase, achieving precise pre-control of carbon emissions. A synergistic reinforcement design using recycled PE fiber networks and multi-microporous slurry is employed, replacing cement and natural aggregates with a large amount of recycled sand, recycled micropowder, and fly ash, reducing cement content to 210-300 parts. While ensuring rapid hardening, high toughness, and good sprayable construction performance, the material's implicit carbon emissions are significantly reduced. The resulting composite material achieves a 28-day compressive strength of 50-65 MPa, with net carbon emissions approaching zero, making it suitable for green building and rapid engineering repair applications.

A method for preparing magnetic lignin-carbon composite materials for electromagnetic shielding belongs to the field of biomass carbon-based electromagnetic functional composite material preparation technology. The method involves in-situ polymerization to coat lignin powder with a polymer-based magnetic particle inducer layer such as polyaniline to obtain an intermediate; subsequently, a uniform and stable loading of Fe, Co, and Ni magnetic particles is achieved through in-situ growth of MOF particles or metal salt solution modification and impregnation processes; finally, high-temperature carbonization yields magnetic lignin-carbon. This invention effectively solves the technical problems of easy aggregation of magnetic particles and weak interfacial bonding by utilizing the abundant active sites provided by the inducer layer, enabling the resulting composite material to possess both the electrical conductivity loss of carbon-based materials and the hysteresis loss of magnetic particles, forming a highly efficient magnetic-electric synergistic loss mechanism. The magnetic lignin-carbon of this invention achieves an average shielding effectiveness of up to 77.5 dB in the 2-18 GHz band, showing broad application prospects in fields such as electromagnetic protection of electronic equipment and military stealth.

This invention discloses a novel carbon / carbon composite material crucible and its preparation method, belonging to the field of carbon / carbon crucible manufacturing technology. The method involves laying a carbon fiber modified mesh onto a plain weave fabric layer to obtain a composite unit layer. This composite unit layer is then laid layer by layer on the bottom and sidewalls of a mandrel and integrally formed by density-stepping needle punching, sequentially preparing the inner, middle, and outer layers of the crucible preform. After demolding the crucible preform from the mandrel, it undergoes curing, high-temperature pretreatment, chemical vapor infiltration densification, graphitization, and anti-oxidation coating protection to obtain the novel carbon / carbon composite material crucible. The density of the middle layer of the crucible preform is greater than that of the outer layer, and the density of the outer layer is greater than that of the inner layer. The novel carbon / carbon composite material crucible prepared by this invention has a uniform microstructure, stable performance, high density, and excellent mechanical properties, which helps to increase the thermal conductivity rate of the crucible, improve the heating efficiency of the product inside the crucible, and achieve energy saving and consumption reduction effects.

The application discloses a kind of fast charging type graphite-silicon carbon composite negative electrode interface modification method and lithium ion battery, belong to lithium ion battery technical field.The method includes: (1) providing graphite-silicon carbon composite negative electrode material;(2) on the surface of material by silane coupling agent chemical grafting forms organic-inorganic hybrid intermediate layer;(3) by chemical vapor deposition on the intermediate layer is constructed with lithium ion and electron conductivity nanoscale inorganic coating;(4) by in-situ polymerization is formed on the inorganic layer elastic polymer buffer layer, finally obtains the modified material with " chemical grafting layer-mixed conductive inorganic layer-elastic polymer layer " gradient interface structure.The gradient interface total thickness is 10-20 nm, electronic conductivity 1.0×10-3 S / cm, lithium ion diffusion coefficient is not less than 5.0×10-12 cm2 / s.Lithium ion battery containing the negative electrode is charged to 80% capacity at 25 DEG C, 3C rate required time ≤16 minutes, and capacity retention rate ≥85% after 500 cycles under this fast charging condition.The application constructs rigid and flexible integrated interface by three-step method, gradient transition, synergistically improves the fast charging performance, cycle stability and energy density of silicon-carbon negative electrode.

This invention discloses a method for preparing a graphene / silicon-carbon composite anode material. The method includes: firstly, preparing a carbon-coated silicon dioxide precursor via a hydrothermal reaction; then, converting it into a carbon-coated silicon material using a magnesothermic reduction method in the presence of sodium chloride, effectively inhibiting the aggregation and growth of silicon particles; finally, combining graphene with the carbon-coated silicon material through a secondary hydrothermal and calcination treatment to construct a conductive network. This invention, through a multi-level structural design, utilizes the synergistic buffering effect of the internal carbon layer and the external graphene to effectively alleviate the volume expansion of silicon during charging and discharging, significantly improving the conductivity and structural stability of the material. The prepared composite anode material exhibits high specific capacity and excellent cycle performance, making it suitable for lithium-ion battery applications.

The present invention relates to a porous silicon-carbon composite having a core-shell structure, a preparing method therefor, and an anode active material comprising same, wherein the core comprises silicon particles and the shell comprises two or more carbon layers including a first carbon layer and a second carbon layer, so that the application of the composite as an anode active material for a secondary battery can enhance the discharge capacity, initial efficiency, and capacity retention rate of the secondary battery. In addition, the preparing method for the porous silicon-carbon composite having the core-shell structure enables the mass production through a continuous process with minimized steps.

This invention relates to a high-efficiency, high-capacity silicon-carbon composite anode material, its preparation method, and its application. The silicon-carbon composite anode material comprises: a phosphorus-doped silicon-carbon material, and a composite coating layer covering the outer surface of the phosphorus-doped silicon-carbon material. A Si-P-C bond structure exists between the phosphorus-doped silicon-carbon material and the composite coating layer. The phosphorus-doped silicon-carbon material comprises: a porous carbon matrix, and nano-silicon particles and phosphorus elements deposited in the pores of the porous carbon matrix. The composite coating layer comprises: a carbon coating layer, and C-F bonds formed in situ within the carbon coating layer. Applying the silicon-carbon composite anode material provided in this invention to lithium-ion batteries can improve the first-cycle coulombic efficiency and cycle stability of lithium-ion batteries, and reduce the expansion rate.

The utility model belongs to wastewater treatment technical field discloses a kind of printing and dyeing wastewater treatment device of integrated heterogeneous fenton catalytic oxidation technology, comprising: fluidized bed reactor, fluidized bed reactor bottom uses cyclone water distributor structure;Micro electrolytic tower, micro electrolytic tower is arranged inside fluidized bed reactor, and micro electrolytic tower is filled with iron-carbon composite filler inside, and ultrasonic auxiliary system is also installed in fluidized bed reactor;Adjusting pool, on-line monitoring instrument is installed in adjusting pool, and water inlet pump is arranged between adjusting pool and fluidized bed reactor, and water inlet pump two ends are respectively with adjusting pool and fluidized bed reactor intercommunication;Oxidant dosing pool, oxidant dosing pool includes inclined plate sedimentation tank, and first water delivery pipe is interconnected between fluidized bed reactor and oxidant dosing pool.The utility model can solve the mass transfer efficiency, catalyst recovery and multistage treatment coordination problem of heterogeneous fenton technology in industrial application by multiple unit synergistic effect.

A silicon-carbon composite material, a negative electrode sheet, and a secondary battery. The silicon-carbon composite material comprises elemental silicon and silicon nitride. The silicon-carbon composite material satisfies: 2≤α≤3, wherein the value of α represents the peak intensity ratio of ISi2p to IN1s, and ISi2p and IN1s are respectively the intensities of the characteristic peaks of the silicon-carbon composite material at 103±0.5 eV and 399±0.5 eV in an X-ray photoelectron spectrum. The silicon-carbon composite material has a relatively high specific capacity, and can also achieve good rate capability, cycling performance and expansion performance.

This invention discloses a mesoporous carbon composite material and its preparation method. The preparation method is as follows: S1: Using tetraethyl orthosilicate as the silicon source, an ethanol / deionized water mixture, a surfactant as the solvent system, and a conductive agent as the dopant, a polycondensation reaction is carried out under acid-base catalysis. A silica / soft template composite is formed through a sol-gel process, followed by high-temperature sintering to obtain a silica composite template; S2: A mixed solution A is prepared by mixing a phenol source, a dispersant, and water; a mixed solution B is prepared by mixing an aldehyde source, a lithium supplement, and a catalyst; S3: Mixed solutions A, B, and the silica composite template are reacted, carbonized, and activated. The resulting material is then added to a hydrofluoric acid solution to dissolve the template, and the resulting material undergoes thermal reduction to obtain the mesoporous carbon composite material. The mesoporous carbon prepared using the template method exhibits advantages such as high uniformity, large pore volume, and low powder resistivity. It can be applied to silicon-carbon composite materials to increase the deposition amount of nano-silicon, improve specific capacity, and reduce the expansion of silicon-carbon materials.