190 results about "Carbon matrix" patented technology

An integrated carbon honeycomb structure material and its preparation method are disclosed, belonging to the field of carbon materials technology. Based on a co-sacrificial template low-temperature pyrolysis strategy, the target material can be obtained through three main steps: preparation of a metal salt-colloidal microsphere template precursor, precursor pressing and molding, and subsequent calcination and carbonization. This technology has the characteristics and advantages of simple preparation process, regular and controllable macroscopic structure of the sample (such as shape, area, and thickness), rich and tunable chemical composition, and three-dimensional interconnection of graphene carbon matrix. It has great application potential in many fields such as electrochemical energy storage, catalysis, gas separation, adsorption, and electromagnetic shielding.

The invention discloses a self-healing high-temperature anti-oxidation carbon-ceramic composite material, belongs to the technical field of ceramic-based composite materials, and particularly relates to a method for introducing a self-healing metal-element-free high-temperature anti-oxidation ceramic matrix into a carbon fiber preform. Then introducing a resin carbon matrix and a self-healing inorganic filler through two times of vacuum impregnation and high-temperature cracking, and finally preparing the SiC matrix by adopting high-temperature siliconizing. The carbon-ceramic composite material prepared by the invention does not contain metal impurities, has a self-healing function, and has a long-life anti-oxidation function in a range of 700-1000 DEG C.

A silicon-carbon composite material, and a preparation method therefor and a use thereof. The silicon-carbon composite material comprises a silicon-carbon composite particle; and the silicon-carbon composite particle comprises a carbon matrix and carbon nanotubes distributed in the carbon matrix, the tubes of the carbon nanotubes containing silicon nanowires.

The invention discloses a metal oxide / carbon / nickel composite material, a preparation method and application of the metal oxide / carbon / nickel composite material to a magnesium-based hydrogen storage material, and belongs to the field of hydrogen storage energy. The problems that a single-component catalyst in the MgH2 hydrogen storage material is low in active site, the interface is inactivated in the circulation process and the like are solved. A metal nickel source and a cerium source are combined with an organic ligand trimesic acid to form bimetal MOF, CeO2 / C / Nix obtained after calcination inherits the high specific surface area of MOF, metal is evenly dispersed in a carbon matrix, CeO2 / C / Nix is introduced into MgH2, microscale efficient catalysis of MgH2 is achieved, when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and the specific surface area of CeO2 / C / Nix is 27.8 wt.%. After 10 cycles, the capacity retention rate is 98.8%, excellent hydrogen storage performance is shown, and a unique insight is provided for large-scale production of the magnesium-based hydrogen storage material.

The invention discloses a covalently bridged bicontinuous hard carbon negative electrode material and a preparation method and application thereof, and belongs to the field of electrochemical energy storage materials. According to the method, the limitation of a biomass hard carbon long-range disordered structure is broken through through a template-self-assembly-reconstruction three-section reaction, atomic-scale synergy of electrons and ions is realized in a hard carbon matrix, and in-situ mechanical interlocking and chemical bridging between heteroatom doped carbon dots and a hard carbon matrix graphite domain are enhanced by utilizing the design of a precursor; topological reconstruction of a carbon skeleton is triggered through pickling purification and a high-temperature carbonization process, and accurate fusion of C-C covalent bonds is realized. The graphitized nano domain grown in the process provides a rapid transmission channel for electrons, generated topological defects and heteroatoms provide a rapid transmission channel for adsorption and surface migration of sodium ions, and the prepared material shows excellent reversible capacity, first coulombic efficiency and rate capability.

The present invention relates to the synthesis of pure metal or multi-metal derivatives of ZIF-11, ZIF-12 or amorphous ZIF structures in high yield followed by calcination under inert conditions to produce in composite nanostructures one or more metal selenide dispersed on the surface of or embedded in a carbon matrix, and using these composites as electrodes for lithium ion batteries, sodium ion batteries, potassium ion batteries, supercapacitors or fuel cells.

The invention provides a high-capacity silicon-carbon composite negative electrode material and a preparation method thereof, and relates to the technical field of battery materials, the high-capacity silicon-carbon composite negative electrode material comprises the following components by mass: 20-50 parts of silicon-based particles, 3-8 parts of an interface modification layer, and 45-75 parts of a carbon matrix; the silicon-based particles are nano silicon; the interface modification layer is oxide or nitride and coats the surfaces of the silicon-based particles; the carbon substrate is prepared from 20 to 40 parts of graphite, 15 to 25 parts of amorphous carbon and 5 to 10 parts of carbon nanotubes; through the three-layer structure of the silicon-based particles, the interface modification layer and the carbon substrate, the cooperation of high capacity and high stability is realized, and the nano silicon-based particles give full play to the advantage of high capacity, so that the first discharge specific capacity of the material is higher; the interface modification layer reduces interface impedance of silicon and carbon and inhibits side reaction of silicon and electrolyte; the three-dimensional network of the carbon matrix not only reduces the electrode impedance, but also provides buffering for silicon volume expansion, and is obviously superior to the traditional graphite and the existing silicon-carbon negative electrode.

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 preparation method of a controllable CNTs@PyC interface layer in carbon / carbon composite material, ZIF-67 with different distribution patterns is carried on the surface of carbon fiber; CNTs are in-situ generated from ZIF-67 through chemical vapor deposition, CNTs are distributed on the surface of carbon fiber in different growth patterns; PyC is deposited on the surface of carbon fiber, different shapes of CNTs@PyC interface layer shape are obtained, by controlling the different growth patterns of ZIF-67 on the surface of carbon fiber, the different distribution states of CNTs derived exist, so as to realize the controllable and adjustable interface layer shape, to meet the application requirements under different conditions: the circular ring shape reduces the stress concentration of CNTs@PyC interface layer, avoids a large number of cracks in the composite material. The wave shape is beneficial to the application of carbon / carbon composite material in the service environment under the tensile condition, prolongs the crack propagation path along the interface layer, effectively relieves the PyC ring cracking phenomenon around the fiber, and is more easy to realize the interlocking effect between the interface layer and the carbon matrix, effectively prevents the interface debonding phenomenon, and greatly improves the mechanical properties of carbon / carbon composite material.

The invention relates to the technical field of catalytic materials, in particular to a monatomic alloy catalyst and a preparation method and application thereof.The preparation method comprises the steps that a first solution obtained by mixing cobalt salt, silver salt and a solvent is mixed with a second solution obtained by mixing 2-methylimidazole and a solvent, stirring treatment is conducted, and a first precursor solution is obtained; and carrying out first heat treatment on the obtained precipitate in an inert atmosphere to obtain the fcc Ag1Co / C monatomic alloy catalyst. A first solution and a second solution are mixed to obtain an Ag / ZIF-67 precipitate which is a Co-based zeolite imidazate framework structure composite material, an organic framework of the Co-based zeolite imidazate framework structure composite material is decomposed and carbonized through high-temperature heat treatment, meanwhile, Ag and Co species are reduced and converted into nanoparticles, and the Ag / ZIF-67 precipitate is obtained. And finally, the composite material catalyst with the Ag1Co monatomic alloy nanoparticles embedded into the nitrogen-doped carbon matrix is formed. The catalyst shows the most excellent activity and selectivity, the removal rate of 4-NP reaches 100% within 6 min, and high catalytic activity can be achieved.

The invention provides a silicon-tin-carbon composite material as well as a preparation method and application thereof. The silicon-tin-carbon composite material comprises a carbon matrix, silicon particles and tin particles, on the basis of the weight of the silicon-tin-carbon composite material, the content of tin in terms of element is 65%-80%, preferably 70%-79%; the content of silicon in terms of element is 0.5%-2.5%, preferably 0.6%-1.5%. The preparation method of the silicon-tin-carbon composite material comprises the following steps: uniformly mixing a tin source, a carbon source and a silicon source, then carrying out heat treatment, and washing the obtained product to obtain the silicon-tin-carbon composite material. The invention also provides an application of the silicon-tin-carbon composite material in preparation of a lithium ion battery negative electrode material. The content of tin in the silicon-tin-carbon composite material provided by the invention is high, and a carbon matrix is of a mesoporous structure; the composite material is simple in preparation method, free of organic solvent, low in cost, safe, environment-friendly and easy for industrial production, and shows good electrochemical performance as a lithium ion battery negative electrode material.

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.

The invention belongs to the field of energy storage materials, and provides a micro-mesoporous synergistic ultrahigh specific surface area porous carbon material as well as a preparation method and application thereof. According to the method, the ionic liquid containing imidazole cations and cyano anions is creatively adopted as a precursor, and the nitrogen-doped carbon matrix which is regular in structure and free of ash is successfully constructed by means of the excellent molecular uniformity and the self-nitrogen-containing characteristic of the ionic liquid. According to the preparation method, high-efficiency etching is carried out through a KOH further chemical activation method, the pore volume distribution of micropores and mesopores is accurately regulated and controlled while the ultrahigh specific surface area (4783.30 m / g) is achieved, an ideal hierarchical porous structure with mesopore transmission and micropore storage is formed, and finally the excellent methane adsorption performance is achieved. The methane storage capacity mass adsorption capacity reaches 0.41 gg <-1 >, and the volume adsorption capacity reaches 250 cm < 3 > (STP) cm <-3 >.

The invention provides a graphene / activated carbon composite material and a preparation method and application thereof, and belongs to the technical field of nano materials, the graphene / activated carbon composite material comprises a carbon matrix and a two-dimensional sheet material covering the carbon matrix; the carbon matrix is an activated carbon material and is a carbon material prepared by performing high-temperature pyrolysis on magnesium citrate in a high-temperature self-propagating reaction process; the two-dimensional sheet material is a graphene material and is a few-layer carbon material which is prepared by converting CO2 through a high-temperature self-propagating reaction and is formed by arranging carbon atoms according to a honeycomb-shaped two-dimensional lattice. According to the invention, graphene is used as a conductive and structural dual skeleton; and a hierarchical pore structure is constructed by utilizing gas production and template effect in the reaction process, so that the electrochemical performance of the active carbon positive electrode is improved. And a proper amount of graphene can provide more active sites and maintain the structural stability at the same time, so that the specific capacity and the cycle life are remarkably improved and prolonged, and the material has a wide application prospect and is particularly suitable for preparing a high-performance lithium ion capacitor positive electrode material.

The invention relates to the field of lithium ion batteries, in particular to a high-ionic-conductivity porous carbon material, a preparation method thereof and a lithium battery. According to the scheme, a new path for green preparation of the porous carbon material is successfully developed, and an alternative process of combining pre-oxidation with water vapor activation is adopted; the doped fluorine-containing substance and the lithium-containing substance are decomposed to release gas in the carbonization process, so that the effect of a pore-forming agent is synergistically achieved, a part of mesoporous transmission channels are formed, synchronous completion of pore-forming and bulk phase doped high-conductivity ion phase is realized, and the obtained three-dimensional porous structure provides a rapid channel for lithium ion transmission; the diffusion energy barrier of ions in a carbon matrix solid phase is reduced by virtue of the LiF nanoparticles in bulk phase distribution; the pre-oxidized stable carbon skeleton provides an electron transmission channel and is used as a mechanical support to buffer volume change, so that the finally prepared silicon-carbon composite material has excellent first effect, high magnification and long cycle stability while keeping high specific capacity.

The invention belongs to the field of preparation of electrochemical energy storage materials and new energy materials, and discloses a monocrystal cobalt oxide / carbon composite material synthesized by a high-pressure gas phase as well as a preparation method and application of the monocrystal cobalt oxide / carbon composite material. The method comprises the following steps: (1) dissolving cobalt salt in an organic solvent to obtain a precursor solution; and (2) adding dry ice into the precursor solution, sealing, and carrying out high-pressure gas-phase reaction in an inert gas atmosphere to obtain the monocrystal cobalt oxide / carbon composite material. The composite material is of a rectangular pyramid structure, and the structure sequentially comprises a carbon layer, single crystal cobalt oxide and a carbon matrix rich in micro-mesopores from outside to inside. According to the invention, in-situ synergistic growth of monocrystal cobalt oxide and a conductive carbon matrix is realized, a stable cobalt oxide / carbon heterogeneous interface, a space required by volume expansion of CoO and an excellent conductive network are constructed, the electron conductivity, Na < + > diffusion kinetics and electrode cycling stability are remarkably improved, and the electrochemical performance is excellent. The invention provides a controllable, green and efficient high-pressure gas phase induction synthesis strategy, and is suitable for large-scale preparation of high-performance sodium storage materials.

The invention provides a silane deposition silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: performing in-situ reaction on zinc salt, dimethylimidazole and a pore-forming agent to obtain a first precursor; and after carbonization treatment, alkali activation is carried out, and then vapor deposition is adopted to obtain the silane deposition silicon-carbon composite material. The prepared silane deposition silicon-carbon composite material has good stability and mechanical strength, hierarchical pore structure distribution and high-capacity ultra-long circulation. The method can solve the problems that existing vapor deposition silicon-carbon is poor in structural stability, and pores of a carbon matrix obtained through traditional ZIF-8 carbonization are prone to collapse.

The application discloses a biomass-based carbon@iron oxide composite material and a preparation method and application thereof. The biomass-based carbon@iron oxide composite material is prepared from biomass, iron salt and ultrapure water through hydrothermal and calcination treatment. The biomass-based carbon@iron oxide composite material has a sheet structure, in which iron oxide particles are riveted on a carbon matrix. The diameter of the iron oxide particles is 16-28 nm, the BET specific surface area is 35.67-103.81 m2 / g, and the specific capacity is 1,000-1,500 mAh / g. 2 g ‑1 The biomass-based carbon@iron oxide composite material of the application is applied to lithium ion batteries, has the advantages of long cycle life, high specific capacity and the like, and is characterized by wide raw material sources, easy large-scale production, low price, safe operation, easy recovery of byproducts and green and pollution-free production.

A gas turbine engine includes a rotor that that has a seal surface, a shaft that has an annular seal channel that opens to the seal surface, and a seal disposed in the annular seal channel for sealing against the seal surface. The seal is made of a composite having carbon fibers disposed in a carbon matrix.

This application relates to a negative electrode material and a battery. The negative electrode material includes a carbon matrix and an active material, with at least a portion of the active material distributed in the carbon matrix. The negative electrode material is tested by X-ray diffraction, and the crystallite size of the carbon matrix in the a-axis direction is calculated as La, the crystallite size in the c-axis direction is Lc, and the interlayer spacing of the carbon matrix on the (002) crystal plane is d. 002 The crystallinity of the carbon matrix is ​​α, where α = (La + Lc) / (La - Lc) * d 002 1.5 < α ≤ 10. The negative electrode material and battery provided in this application can improve the cycle stability and fast charging performance of the negative electrode material.

This invention relates to an aminophosphonate-functionalized carbon material, its preparation method, and its uses. The aminophosphonate-functionalized carbon material comprises a carbon matrix and a structure of Formula I covalently linked to the carbon matrix. It can be applied to capacitive deionization technology to selectively adsorb thorium from a mixed solution containing thorium and rare earth elements, exhibiting a high adsorption capacity for thorium.

The application discloses a silicon-carbon negative electrode material with high cycle stability and a preparation method thereof. The silicon-carbon negative electrode material takes carbon as a matrix, and silicon core particles are uniformly dispersed in the carbon matrix. A silicon and metal alloy layer is arranged on the surface of the silicon core particles, and a silicon carbide layer is in-situ grown on the surface of the silicon and metal alloy layer. In the preparation, silicon is taken as the core, and the surface layer is formed by nano particles of silicon and other metal alloys. Then, the nano particles are compounded with resin materials, vacuum heat treatment is conducted, and a composite material in which the nano particles are uniformly dispersed in the carbon matrix is formed to obtain the silicon-carbon negative electrode material. In the application, the silicon-carbon composite negative electrode material with excellent cycle stability can be prepared at a lower temperature. The method is simple in process, low in cost, environment-friendly, and easy to industrialize, and is a silicon-carbon negative electrode preparation method with more excellent comprehensive performance than existing methods.

According to an exemplary embodiment of the present invention, a silicon-carbon composite that can improve the lifespan characteristics of a secondary battery is provided. The silicon-carbon composite is a silicon-carbon composite for use as a negative electrode active material, comprising a carbon matrix and silicon nanoparticles trapped in the carbon matrix, wherein the surface roughness (Rq) of the silicon-carbon composite can be 4-50 nm.

The utility model discloses a zinc air cell composite electrode device based on nonmetal PNC catalyst, including electrode anode, the inside of electrode anode is equipped with the electrode cathode of adaptation, be equipped with insulating seal layer between electrode anode and electrode cathode, the inside of electrode cathode respectively includes zinc powder, zinc electrode layer and carbon skeleton, zinc electrode layer and carbon skeleton evenly distribute in the inside of electrode cathode, the utility model discloses a prevent seepage layer and carbon cloth and catalyst layer are set up in the inner layer structure of electrode anode and electrode cathode, and have catalytic composite layer between prevent seepage layer and carbon cloth to utilize the adhesive bonding structure in catalytic composite layer, promote carbon matrix and catalyst layer mix to form the high stability porous network electrode structure with electrode cathode combination under the catalytic layer cooperation of this composite structure, and have the component with high catalytic activity.

The invention relates to the technical field of catalyst preparation, and particularly discloses a non-stoichiometric selenium-doped Cu7.2 S4 photocatalyst based on carbon coating and a preparation method and application thereof, and the preparation method comprises the following steps: preparing copper-based metal organic framework precursor powder, then mixing the copper-based metal organic framework precursor powder with a selenium source and a sulfur source, and carrying out high-temperature post-vulcanization, selenylation and carbonization processes to prepare the photocatalyst. The photocatalyst prepared by the invention comprises selenium-doped Cu7. 2S4 and a carbon matrix material, wherein the carbon matrix material is coated on the surfaces of selenium-doped Cu7. 2S4 particles. The prepared photocatalyst has good visible light response, excellent carrier transport performance and good stability, can generate superoxide free radicals and hydroxyl free radicals under visible light irradiation, further shows excellent water pollutant photocatalytic degradation capacity and has good application prospects.

This invention discloses a carbon-based anode material with an ultrafast ion transport channel, its preparation method, and its application, belonging to the field of new energy technology. The carbon-based anode material provided by this invention includes a carbon matrix and active particles embedded in the carbon matrix; the active particles include hollow graphite and amorphous carbon coated on the surface of the hollow graphite. The carbon-based anode material provided by this invention possesses an ultrafast ion transport channel and can accommodate volume changes during charge and discharge, effectively improving the cycle performance and rate performance of lithium-ion batteries. This invention also provides a preparation method and application of the above-mentioned carbon-based anode material.

The invention discloses a NiCo-C-C / MXene composite material with excellent electromagnetic wave absorption performance and a preparation method of the NiCo-C-C / MXene composite material. According to the material, a multi-component heterogeneous interface engineering strategy is provided, a Prussian blue analogue precursor is coated with polydopamine, MXene is combined, and the NiCo (at) C (at) C / MXene composite material with a layered structure is prepared through high-temperature pyrolysis. Aiming at the problems of organic ligand loss, low carbon content, easy structure collapse, insufficient mechanical strength and conductivity and the like of the traditional PBA derivative material, the method effectively inhibits structural damage at high temperature by introducing a PDA shell layer rich in carbon sources, and meanwhile, a stable conductive network is constructed by utilizing the excellent conductivity of MXene. According to the finally prepared composite material, abundant heterogeneous interfaces and defect sites are constructed among the NiCo nanoparticles, the mixed crystallinity carbon matrix and the MXene layer, and the impedance matching and attenuation capabilities are remarkably optimized through the synergistic effect of interface polarization loss and multiple loss mechanisms.

The invention discloses a preparation method of a carbon-ceramic composite material, which comprises the following steps: S1, carbon fiber modification treatment: firstly, depositing carbon nanotubes on the surface of short carbon fibers to form an intermediate layer, and constructing a secondary coarse structure; a chemical vapor deposition method is adopted, methane and hydrogen are introduced, the temperature is adjusted, nucleation is carried out on the surface of the carbon nano tube, and a graphene layer grows on the surface of the carbon nano tube; s2, infiltration and heat treatment: soaking the obtained modified short carbon fibers in a polycarbosilane solution through an easy impregnation method, carrying out pre-crosslinking, heating a sample to 150-350 DEG C in an air or inert atmosphere, and carrying out heat preservation for a period of time; the residual branched chain is further fractured and cross-linked to form an amorphous Si-C-O or Si-C network at 200-500 DEG C, the organic group is decomposed and transformed to disordered carbon and a primary SiC nanocluster at 500-1000 DEG C, atoms are rearranged and crystallized at 1000 DEG C to form nano SiC crystal grains, the nano SiC crystal grains are embedded into a carbon matrix, and the nano SiC crystal grains are transited to a pure SiC layer. According to the invention, the modified carbon fiber and the ceramic matrix can be better combined, and the layering risk is reduced.

The composite powder may be formed by blending silicon particles with petroleum asphalt under milling conditions. The composite powder may include up to about 50 weight percent silicon particles, based on the total mass of the composite powder, and about 15 weight percent to about 95 weight percent petroleum asphalt, based on the total mass of the composite powder, and optionally up to 80 weight percent graphite particles. The silicon particles are dispersed in a matrix comprising the petroleum asphalt, and the petroleum asphalt comprises a plurality of asphalt particles. The composite powder may then be converted to a carbon matrix comprising amorphous carbon by heating the petroleum pitch at a temperature of about 700 DEG C to about 1800 DEG C in an environment comprising about 0.1 mol% or less of oxygen.

The invention provides an atomic-scale catalyst-carbon nanotube composite material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical catalysis. The atomic-scale catalyst-carbon nanotube composite material prepared by the invention has a mutually cross-linked carbon nanotube three-dimensional conductive network, and the network contains a nitrogen-doped carbon matrix formed by in-situ pyrolysis of phenanthroline and wrapped on the outer wall of the carbon nanotube. An atomic-scale dispersed metal species M is stably anchored in a nitrogen-doped carbon matrix through an M-Nx coordination bond to form single / double atomic sites, so that a stable three-dimensional structure in which the carbon tube is used as a skeleton and the nitrogen-doped carbon is used as muscle is formed, and rich micropores and mesopores are formed. The prepared atomic-scale catalyst-carbon nanotube composite material has efficient catalytic activity and high conductivity, and shows excellent electrochemical performance when being used for electrochemical catalysis.