371 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.

A method of fabricating a biochar composite product comprises thermally treating a precursor composition by heating the precursor composition according to a heating profile to provide a biochar composite product, the precursor composition comprising biochar and a natural binder other than lignin, wherein the natural binder forms a solid, porous, covalently bound carbon matrix at or above a threshold temperature, wherein the biochar composite product comprises a plurality of porous, carbonaceous particles and the solid, porous, covalently bound carbon matrix on surfaces of particles in the plurality such that neighboring particles are adhered together. The biochar composite products and methods of using the products are also provided.

A silicon-carbon composite material and a preparation method therefor, a negative electrode sheet, a secondary battery, and a device. The silicon-carbon composite material comprises a carbon matrix having a pore structure and a silicon-based material distributed in the pore structure of the carbon matrix, and the silicon-carbon composite material contains the element phosphorus. The silicon-based material in the silicon-carbon composite material increases the capacity of the carbon matrix, and the carbon matrix having the pore structure improves the conductivity of the silicon-based material, and can also be used as a buffer medium for volume expansion of the silicon-based material during charging and discharging, so that the problem of increase of the volume of a secondary battery due to silicon expansion is effectively relieved; in addition, the element phosphorus doped in the framework of the carbon matrix is beneficial to improving the electronic conductivity of the material, thus improving the cycle performance of the battery.

A negative electrode material, a negative electrode sheet and a battery. The negative electrode material comprises a carbon matrix and an active substance, wherein the carbon matrix is provided with pores, and the active substance is at least partially distributed in the pores. The area proportion of the pores having a pore diameter larger than 50 nm in any section of the negative electrode material is α, which satisfies: α≤10%, wherein α is obtained by means of the following test method: in an image as shown by the SEM section treatment of a single negative electrode material particle, any a×b region is selected, where a=1-10 μm and b=1-10 μm, the sum of the sectional areas of pores having a pore diameter larger than 50 nm in the region of the section of the single negative electrode material particle is denoted as S0, the sectional area of the single negative electrode material particle in the region is denoted as S, the area proportion of the pores having a pore diameter larger than 50 nm in the section of the single negative electrode material particle is defined as α', where α'=S0 / S, and α is the arithmetic mean value of α' values of at least 10 negative electrode material particles.

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.

The invention provides a negative electrode material and a preparation method thereof, and a battery, the negative electrode material comprises an active substance, the active substance comprises a carbon matrix and silicon particles, the carbon matrix has holes, and at least part of the silicon particles are distributed in the holes of the carbon matrix; the negative electrode material contains an oxygen element and a nitrogen element, the mass content of the oxygen element is A%, and the mass content of the nitrogen element is B%; the powder conductivity of the negative electrode material is PS / m and meets the following relation: (A + B) / P is less than or equal to 3. According to the negative electrode material provided by the invention, the gas production phenomenon of the negative electrode material can be reduced on the premise of keeping relatively high electronic conductivity.

The invention relates to the technical field of soil remediation and saline-alkali soil treatment, and discloses a nano-carbon-based slow-release saline-alkali soil conditioner and a gradient controlled release method thereof.The formula comprises a layered nano-carbon matrix, a humic acid intercalation compound, a pH response type cross-linking agent, a calcium ion modifier and a phosphate radical modifier; the method comprises the following steps: constructing a self-regulation repair system for synchronously optimizing salt reduction, nutrient supply and ion balance through a three-dimensional synergistic mechanism of pH response type sodium ion targeted adsorption, microbial activity driven nutrient controlled release and calcium-sodium dynamic replacement. A nano carbon-humic acid layered composite structure is used for synergic desalination and slow-release fertilizer supply, a Ca < 2 + >-PO4 < 3-> gradient ion replacement system is combined for synchronous salt reduction and structure fixation, a pH response coating technology is used for realizing accurate release of nutrients triggered by microbial activity, and a three-dimensional interpenetrating network and graded pores are used for guaranteeing the long-acting stability of the material. And finally, multiple repairing functions are integrated into a single material.

The invention relates to the technical field of lithium ion batteries, and particularly discloses a silicon-carbon-based composite material, a preparation method thereof and application of the silicon-carbon-based composite material in a lithium ion battery. The silicon-carbon-based composite material is prepared by taking a carbon nanotube as a seed crystal through a silicon-carbon co-deposition reaction, and no nanoscale pores exist between a disordered carbon matrix and silicon particles of the silicon-carbon-based composite material. According to the structural characteristics, the transmission bottleneck problem of a traditional CVD silicon carbon material is fundamentally solved, the dynamic performance of the material is remarkably improved, and the situation of voltage and capacity diving at the discharge tail end is thoroughly avoided. The continuous production of the silicon-carbon-based composite material is realized, the production efficiency of the lithium ion battery is remarkably improved, the production cost of the lithium ion battery is reduced, the dependence on special raw materials is reduced, the limitation of customized porous carbon production is avoided, and the method has obvious economic and market advantages and is worthy of popularization and application. The invention provides a negative electrode material with excellent comprehensive performance for the lithium ion battery, and has great significance for promoting the technical development of the lithium ion battery.

The invention discloses a preparation method of an electrode composite material, the electrode composite material and application of the electrode composite material, and the preparation method comprises the following steps: sequentially crushing and pickling a soft carbon raw material to obtain a soft carbon precursor; placing the soft carbon precursor, a hard carbon material and absolute ethyl alcohol in a sand mill for sanding treatment, and uniformly mixing to obtain a mixed dispersion liquid; carrying out drying treatment on the mixed dispersion liquid to obtain a composite carbon matrix precursor; placing the composite carbon matrix precursor in a rotary furnace, performing carbonization treatment in an inert gas environment, and performing grinding, crushing and sieving to obtain a carbonized compound; placing the carbonized compound in a rotary furnace, and activating under the condition of carbon dioxide gas and / or water vapor to obtain a composite carbon matrix containing a pore structure; and introducing gas containing a silicon source into the rotary furnace, depositing nano silicon in pores of the composite carbon matrix through chemical vapor deposition, and crushing to obtain the electrode composite material.

The invention provides a mesoporous silicon carbon negative electrode material and a preparation method and application thereof, and relates to the technical field of battery negative electrode materials, the mesoporous silicon carbon negative electrode material comprises a mesoporous carbon matrix and silicon; the mesoporous carbon matrix can be a spherical, spheroidic or irregular block, the mesoporous carbon matrix has mesoporous structures, and preferably, the mesoporous structures are in ordered distribution; according to the invention, the preparation of the uniform mesoporous structure is realized, the volume expansion of the silicon is effectively relieved, the close combination of the silicon and the carbon is realized by vapor deposition of the silicon on the mesoporous sphere carbon matrix material, and the cycling stability of the material is improved. According to the meso-porous silicon carbon negative electrode material provided by the invention, by optimizing the structural design of the material, the problems of silicon volume expansion, infirm interface bonding, complex preparation process and the like in the prior art are solved.

The present application relates to the technical field of negative electrode materials. Provided are a negative electrode material and a battery. The negative electrode material comprises an inner core and a coating layer located on at least part of the surface of the inner core. The inner core comprises a carbon matrix, and an active substance and boron element distributed in the carbon matrix. The active substance comprises a silicon material and a metal material, and at least part of the silicon material being connected to the metal material. The negative electrode material of the present application has low expansion, ultra-high conductivity, and high initial coulombic efficiency.

The invention belongs to the technical field of preparation of wave-absorbing materials, and particularly relates to a cobalt-based nitrogen-doped carbon nano composite material with a hollow cubic structure as well as a preparation method and application thereof. Comprising the following steps: taking ZnCo-ZIF with a nano cubic structure as a core, coating ZnCo-ZIF with polydopamine by adopting a precipitation method to form a precursor with a core-shell structure, and carbonizing the precursor at 800-900 DEG C to obtain the cobalt-based nitrogen-doped carbon nano composite material with the hollow cubic structure. According to the invention, the dielectric loss capability can be enhanced by using the conductivity and interface polarization effect of the coated carbon layer, and the Co particles introduce strong magnetic loss; meanwhile, due to interface polarization caused by abundant heterogeneous interfaces existing between the Co particles and the coating carbon layer, between the magnetic particles and the carbon nanotubes and between the carbon matrix and the carbon nanotubes in the composite material, the impedance matching characteristic can be improved, and high reflection loss and wide effective absorption bandwidth can be achieved under the low matching thickness.

The invention relates to the technical field of aerogel wave-absorbing materials, in particular to a multi-scale structure composite carbon aerogel wave-absorbing material and a preparation method thereof. The aerogel wave-absorbing material comprises a three-dimensional skeleton, a functional component and a conductive network. The three-dimensional skeleton is of a hierarchical porous structure formed by crosslinking two-dimensional graphene oxide and one-dimensional aramid nanofibers through hydrogen bonds, the functional component is zero-dimensional CoFe2O4 nanoparticles which are uniformly dispersed on the three-dimensional skeleton through in-situ growth, and the conductive network is an sp / sphybrid carbon matrix formed by carbonizing the three-dimensional skeleton and the functional component at high temperature. Through multi-dimensional cooperative construction of the zero-dimensional CoFe2O4 nanoparticles, the one-dimensional aramid nanofibers and the two-dimensional graphene, a rich heterogeneous interface and a polarization center are formed in the material, the electromagnetic wave loss capacity is remarkably enhanced, the broadband efficient wave absorbing requirement can be met, and the electromagnetic compatibility of aerospace electronic equipment is remarkably optimized.

This application provides a negative electrode active material, a secondary battery, and an electrical device. The silicon-carbon negative electrode material includes a silicon-carbon composite material, which comprises a first silicon-carbon composite particle and a second silicon-carbon composite particle. The first silicon-carbon composite particle comprises a first carbon matrix with a porous structure and a first silicon-based material disposed within the porous structure of the first carbon matrix. The second silicon-carbon composite particle comprises a second carbon matrix with a porous structure and a second silicon-based material disposed within the porous structure of the second carbon matrix. Furthermore, the mass percentage of silicon in the first silicon-carbon composite particle is greater than the mass percentage of silicon in the second silicon-carbon composite particle. This silicon-carbon negative electrode material exhibits both high specific capacity and good cycle stability, thereby improving the energy density and cycle performance of the battery.

The invention provides a silicon-carbon composite material and a preparation method and application thereof.The silicon-carbon composite material comprises a carbon matrix and nanometer silicon particles, the nanometer silicon particles are located in pores of the carbon matrix, the Raman spectrum of the silicon-carbon composite material meets the condition that IA is larger than or equal to 1.2 IB, IA is the peak intensity of the Raman spectrum of the silicon-carbon composite material at 520 cm <-1 > + / -5 cm <-1 >, and IB is the peak intensity of the Raman spectrum of the silicon-carbon composite material at 520 cm <-1 > + / -5 cm <-1 >. And IB is the peak intensity of the Raman spectrum of the silicon-carbon composite material at 480cm <-1 > + / -5cm <-1 >. According to the silicon-carbon composite material provided by the invention, the gas production rate in the anode slurry preparation process can be reduced, the specific capacity of the silicon-carbon composite material is improved, and the high-temperature cycle performance of a secondary battery is improved.

The invention belongs to the technical field of lithium metal batteries, and provides a lithium-sulfur battery negative electrode protection film, a preparation method and application thereof, and a lithium-sulfur battery. The lithium-sulfur battery negative electrode protection film provided by the invention comprises a carbon matrix (formed by interweaving nano carbon fibers) and an active metal compound (one or more of metal nitride, metal phosphide and metal telluride) embedded in the carbon matrix. The lithium-sulfur battery negative electrode protection film is arranged between the lithium negative electrode and the diaphragm, the lithium-sulfur battery negative electrode protection film has an independent and self-supporting structure, and compared with a scheme for pretreating and protecting the lithium negative electrode in the prior art, the lithium-sulfur battery negative electrode protection film is simple to operate and easier to industrialize. The lithium-sulfur battery negative electrode protective film provided by the invention has excellent mechanical strength, chemical stability and ionic conductivity, and can effectively inhibit the growth of lithium dendrites, protect the stability of an SEI (Solid Electrolyte Interphase) film and prolong the cycle life of a lithium negative electrode.

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.

The present invention belongs to the technical field of battery material preparation, and specifically discloses a hard carbon material, a preparation method thereof and an application. The preparation method of the hard carbon material provided by the present invention impregnates the pore-filling carbon source mixed system into the large and small pores in the activated carbon under high temperature and high pressure. The pore-filling carbon source deposits into small molecule fragments in the pores of the activated carbon through a chemical reaction, and then rapidly raises the temperature to a specific temperature and keeps it warm, so that the pore-filling carbon source decomposes to form a carbon matrix to block the pores. Moreover, the disordered carbon atoms in the activated carbon can also form a large number of graphite domains. During the formation of the graphite domains, due to the difference in the nucleation energy barriers of different carbon atoms, there is a strong electrostatic repulsion between the layers, thereby broadening the interlayer spacing. The preparation method provided by the present invention greatly improves the fast charging performance of the hard carbon material when applied to the electrode sheet by reducing the closed pore volume and broadening the interlayer spacing.

The invention provides a nanometer silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The composite material comprises nanometer silicon particles, a first carbon matrix and a second carbon layer. The preparation method of the nano silicon-carbon composite material comprises the following steps: (1) contacting a porous carbon material with a silicon source-containing solution to obtain a material A; (2) uniformly mixing the material A with a reducing agent-containing solution, and treating to obtain a material B; (3) introducing a treating agent into the material B to prepare a silicon-carbon composite material precursor; (4) uniformly mixing the silicon-carbon composite material precursor with the carbon material precursor C to obtain a material D; and (5) in the presence of the carbon material precursor E, carrying out aging treatment on the material D, and then drying and pyrolyzing to obtain the silicon-carbon composite material. According to the preparation method, the nano silicon-carbon composite material with high specific capacity and long cycle stability can be obtained.

The invention relates to the technical field of fiber composite materials, and discloses a preparation method of a carbon-based carbon fiber composite material, which comprises the steps of carbon fiber pretreatment, double-layer film preparation, sheet filler directional arrangement, carbon-based paste material preparation, mold forming, pressing and heat treatment, and dipping and filling. According to the invention, through a bionic hierarchical arrangement structure and a hydrodynamic force assisted orientation technology, highly oriented arrangement of the flaky filler in a coating is realized, a'brick-mud 'structure similar to a shell pearl layer is formed, and meanwhile, a surface gradient functionalization and sacrificial bond forming method is adopted, so that the surface gradient functionalization is realized. The problems of insufficient interface bonding strength and poor anti-fluorination performance of the coated carbon fiber and the carbon matrix are solved, and the service life and the comprehensive performance of the anode plate are remarkably improved.

The invention relates to the technical field of negative electrode materials, and particularly discloses a high-capacity hard carbon material and a preparation method and application thereof. The preparation method comprises the following steps: adding biomass into an acid solution for reaction, adding the obtained pretreated biomass and organic carboxylic acid metal salt into water, carrying out cross-linking esterification reaction and solid-liquid separation at 70-90 DEG C, and drying the obtained solid at 160-200 DEG C to obtain a hard carbon precursor; and heating the hard carbon precursor to 1100-1300 DEG C in a protective atmosphere, and carbonizing to obtain the high-capacity hard carbon material. The esterification structure inhibits ordering of a carbon matrix, bends a carbon layer around pores, realizes wrapping of the pores, and finally converts an internal porous structure into a rich closed-pore structure. The preparation method focuses on a technological means of anion / cation coordinated regulation and control, and coordinated regulation and control of a pore-interface are carried out from the atomic scale, so that a new way is provided for low-cost preparation of a high-capacity and high-first-effect hard carbon material.

A negative electrode material, which comprises an active material, the active material comprising a silicon material and a carbon matrix having pores, wherein at least part of the silicon material is located in the pores of the carbon matrix. The true density of the negative electrode material is ρ g / cm3, the total pore volume thereof is V cm3 / g, and the negative electrode material satisfies the following formula: M=ρV / (ρ+V), where 0.020≤M≤0.085. The negative electrode material has strong structural stability and a low volume expansion rate, and has characteristics such as a high capacity, high initial Coulombic efficiency and good cycling performance.

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 porous carbon / anode material composite, including: (a) a porous carbon structure host having pores and pore walls (e.g., carbon framework or skeletons); (b) a plurality of anode active material particles that are disposed in said pores and wherein a weight fraction of the anode active material particles in the composite is from 0.1% to 99%; and (c) an optional carbon coating deposited on a surface of the active material particles or a carbon matrix with the anode active material particles dispersed in the carbon matrix, wherein the carbon coating occupies from 0% to 30% by weight of the composite. Also provided is an anode, including such a porous carbon / anode material particle composite, a lithium-ion cell including such an anode, and a method of producing the porous composite.

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 negative electrode material and a battery. The negative electrode material comprises a carbon matrix and a silicon material. When the negative electrode material is tested by means of Raman spectroscopy, the negative electrode material has a first characteristic peak at 520±10 cm-1, the peak intensity of the first characteristic peak being IA, the negative electrode material has a second characteristic peak at 960±10 cm-1, the peak intensity of the second characteristic peak being IB, and the negative electrode material has a third characteristic peak at 480±10 cm-1, the peak intensity of the third characteristic peak being IC, wherein IA, IB and IC have the following relationship: 0.3≤IA / (IB+IC)≤0.6. The negative electrode material has high initial coulombic efficiency, high reversible capacity and high expansion resistance.