30results about "Oxy/sulfo carbides" patented technology

The invention discloses a silicon-oxygen-carbon-based negative electrode material and a preparation method thereof, and belongs to the technical field of lithium battery negative electrode materials, and the preparation method comprises the following steps: (1) mixing alcohol, water and acid to prepare an acid solution with the pH value of 2-4, adding organosiloxane into the acid solution, and stirring in a water bath to obtain a siloxane hydrolysate; (2) adding a pyrene compound into the siloxane hydrolysate, and carrying out ultrasonic treatment; (3) adding alkali, stirring in a water bath at 20-50 DEG C for 1-3 hours, and then freeze-drying to obtain a precursor of SiOC; and (4) placing the precursor in an atmosphere furnace, sintering in an argon atmosphere, and naturally cooling to obtain the modified negative electrode material SiOC. The amorphous carbon content of the prepared SiOC is increased, on one hand, the electronic conductivity of the SiOC can be improved, and on the other hand, volume expansion in the charging and discharging process can be relieved.

The application relates to a synthesis and preparation method of a doped SiOC microsphere reinforced aerogel composite material, which comprises the following steps: SiOC microsphere preparation and SiOC microsphere and aerogel compounding. Tetraethyl orthosilicate, phenyltrimethoxysilane and dimethyldimethoxysilane are used as precursors, hydrochloric acid and ammonia are used as catalysts for polymerization, and high-temperature calcination is carried out in a muffle furnace to obtain SiOC microspheres; methyltrimethoxysilane, dimethyldimethoxysilane, hydrochloric acid, CTAB and urea are added to the SiOC microsphere system under ultrasonic dispersion, and stirring is carried out to obtain a wet gel; a normal-pressure drying process is used for drying, and finally, the SiOC microsphere doped aerogel composite material is obtained. The raw materials such as tetraethyl orthosilicate and phenyltrimethoxysilane used in the application have simple sources, low prices and are green and environment-friendly; the SiOC microspheres have good compatibility with the aerogel matrix, can effectively avoid defects generated in the aerogel due to the compounding of the SiOC microspheres and the aerogel, and can effectively enhance the mechanical properties. The normal-pressure drying operation is simple and safe, and the obtained aerogel composite material has low density, good hydrophobicity and low thermal conductivity.

The present invention provides low-oxygen vanadium aluminum carbide (V2AlC) MAX for producing high-purity vanadium MXene, and a manufacturing method therefor.

The present application relates to a composite current collector (10). [Solution] The composite current collector (10) includes: a base layer (1) having a first surface (11) and a second surface (12) arranged back to back along the thickness direction, the base layer (1) being made of a polymer material; a first modified layer (3) arranged on the first surface (11) of the base layer (1), the first modified layer (3) being made of one or more of silicon carbide oxide, titanium carbide oxide, and aluminum carbide oxide nanomaterials; and a first metal layer (2) arranged on the surface of the first modified layer (3) facing away from the base layer (1).

The application discloses a preparation method of a room-temperature liquid-phase plasma constructed covalent interface silicon-based negative electrode material. x The MXene colloidal suspension mixture is subjected to plasma treatment to obtain a plasma modified suspension; S2, the plasma modified suspension is subjected to suction filtration and then annealing treatment to obtain the covalent interface silicon-based negative electrode material Si@TiO2@MXene. The application also discloses the covalent interface silicon-based negative electrode material Si@TiO2@MXene obtained by the above preparation method and application of the covalent interface silicon-based negative electrode material Si@TiO2@MXene in a lithium ion battery negative electrode and a lithium ion battery. The application realizes in-situ TiO2 interlayer growth on a silicon surface and Si-O-Ti covalent interface bonding through room-temperature liquid-phase plasma in one step, constructs a hierarchical double-constraint structure, and realizes the super-long cycle life and excellent rate performance of the silicon-based negative electrode in the lithium ion battery under high silicon content.

The application belongs to the technical field of membrane separation, and discloses a Ti3C2T x MXene quantum dot composite polyamide reverse osmosis membrane preparation method, first, Ti3C2T x MXene material is subjected to liquid nitrogen intercalation treatment and interlayer expansion, and Ti3C2T x MXene quantum dot nanomaterial; then, Ti3C2T x MXene quantum dot nanomaterial is prepared; the polyamine aqueous solution and the polyacyl chloride solution; the ultrafiltration base film is soaked in the water-phase monomer solution, the water-phase monomer solution on the film surface is blown dry; then, the base film is immersed into the organic-phase solution, interface polymerization reaction occurs, and an active layer is formed; the composite film after interface polymerization is placed and subjected to heating treatment, and interface polymerization reaction is further promoted to occur. The preparation process is simple, the prepared reverse osmosis membrane has good membrane performance, that is, has higher water flux and better anti-pollution performance.

The present disclosure belongs to the technical field of membrane separation, and discloses a preparation method of a Ti3C2Tx MXene quantum dot (MQD)-modified polyamide (PA) reverse osmosis (RO) membrane. The preparation method includes the following steps: subjecting a Ti3C2Tx MXene material to liquid nitrogen intercalation and interlayer expansion to obtain a Ti3C2Tx MQD nanomaterial; preparing an aqueous phase solution with the Ti3C2Tx MQD nanomaterial and an organic phase solution; soaking an ultrafiltration (UF) base membrane in the aqueous phase solution, and removing the aqueous phase solution on a surface of the UF base membrane through blow-drying; soaking the second UF base membrane in the organic phase solution to allow interfacial polymerization to form an active layer; and allowing a composite membrane obtained after the interfacial polymerization to stand, followed by a heat treatment to further promote the interfacial polymerization.

The present disclosure provides a two-dimensional particle capable of providing a conductive film capable of maintaining a high conductivity even under high humidity conditions. Another object of the present invention is to provide a method for producing such a two-dimensional particle. The two-dimensional particle according to the present disclosure is a two-dimensional particle comprising one or plural layers, the two-dimensional particle comprising a metal cation, the layer comprising: a layer body represented by a formula below: MmXn wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T existing on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, an amine group, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom and a hydrogen atom, the modifier or terminal T comprising a chlorine atom, the metal cation comprising at least one cation selected from the group consisting of Na and K, and a content of Li being less than 0.002% by mass.

The invention discloses an MXene / PEDOT: PSS / CNT (at) CoFe2O4 electromagnetic shielding film and a preparation method thereof. A bottom layer of the film is MXene, a transition layer is MXene / PEDOT: PSS, an absorption mixing layer is an MXene / PEDOT: PSS / CNT (at) CoFe2O4 layer, and the bottom layer, the transition layer and an upper layer are sequentially subjected to suction filtration; the preparation method comprises the following steps: forming a gradient structure from high conductivity to high impedance by regulating and controlling the mass fractions of PEDOT: PSS and magnetic powder CNT coated CoFe2O4 in different layers, and promoting multiple reflection and loss of electromagnetic waves in the film by combining a magnetoelectric synergistic effect and matching interface impedance; magnetic particles of cobalt ferrite CoFe2O4 are loaded on carboxylated carbon nanotubes MWCNT-COOH by adopting a coprecipitation method, so that the absorption performance of the film is enhanced. The film is prepared through layer-by-layer vacuum filtration and hot pressing, and has high electromagnetic shielding effectiveness, strong absorption characteristic, flexibility and mechanical strength.

Composite gel particles with an ammonium diuranate matrix phase and a phenolic resin phase incorporated within the ammonium diuranate matrix phase are produced from a first solution comprising uranyl nitrate, a phenol, and optionally formaldehyde, wherein the uranyl nitrate and the phenol are present in a ratio ranging from 2:1 to 25:1; and a second solution comprising hexamethylenetetramine and urea. The first solution and the second solution are mixed, and drops of the resulting mixture into a heated second liquid which is immiscible with the mixed solution. Heat from the second liquid causes the hexamethylenetetramine to decompose to form ammonia, which reacts with the uranyl nitrate to cause each of the drops to form an ammonium diuranate gel particle. The ammonium diuranate gel particles are collected. The ammonium diuranate gel particles include the phenolic resin phase within the ammonium diuranate matrix phase, where the phenolic resin phase is formed by reaction between the phenol and formaldehyde. The first solution may include uranyl nitrate, the phenol, and formaldehyde, and the formaldehyde and the phenol may react to form the phenolic resin phase prior to mixing the first solution and the second solution. The first solution may be free of formaldehyde, and heat from the second liquid may causes the hexamethylenetetramine to decompose to form formaldehyde in situ; so that the formaldehyde and the phenol react to form the phenolic resin phase while the ammonia reacts with the uranyl nitrate.

The invention belongs to the technical field of electrocatalyst material preparation, and discloses a preparation method of a Mo2C / Co3Mo3C / petal-shaped three-dimensional ultrathin carbon heterostructure electrocatalyst, which comprises the following steps: dissolving salicylic acid, cobalt chloride hexahydrate and sodium molybdate dehydrate in absolute ethyl alcohol and deionized water by a simple pyrolysis method, stirring for dissolving, drying to obtain a catalyst precursor, and preparing the Mo2C / Co3Mo3C / petal-shaped three-dimensional ultrathin carbon heterostructure electrocatalyst. And putting the catalyst precursor into a crucible, introducing inert gas into a tubular furnace for annealing treatment, and washing and drying to obtain the electrocatalyst. The prepared electrocatalyst material has a unique heterostructure, provides more active sites for reaction and accelerates the electron transfer rate, so that the electrocatalytic water decomposition performance is improved.

An oxide material comprising: one or more materials selected from the group consisting of a nanofiber, a nanowire, and a two-dimensional substance, and represented by a formula: MQaOb wherein M is one or more element selected from the group consisting of Groups 3, 4, 5, 6, and 7, Q is one or more element selected from the group consisting of Groups 12, 13, 14, 15, and 16, excluding O, a is 0 to 2, and b is more than 0 and 2 or less; and a metal element and / or metalloid element on a surface and / or between layers of the one or more materials, wherein a total content of halogen elements is 0.90 mass % or less.

To provide MAX and MXene using low-cost vanadium carbide instead of an expensive vanadium metal, and a method for preparing same.SOLUTION: There is provided MAX using low-cost vanadium carbide, wherein the MAX consists of vanadium carbide of vanadium, aluminum, and carbon, and is used as a raw material for MXene, which is a two-dimensional nanomaterial, and is at least one selected from compounds represented V2AlC, V4AlC3, and V12Al3C8.SELECTED DRAWING: Figure 5

The application discloses a Si-Al-C-O ceramic precursor with high aluminum content and a synthesis method and application thereof, and the Si-Al-C-O ceramic precursor has a softening point of 120-250 DEG C, a number average molecular weight of 2500-4000, and an aluminum content of 1-20 wt%. The preparation method comprises the following steps: firstly, dissolving polysiloxane resin and an aluminum source in a solvent; and then, transferring the reaction solution into a high-pressure reaction kettle to perform a high-temperature and high-pressure synthesis reaction. Under the high-temperature and high-pressure conditions, the solvent reaches a supercritical state, the molecules of the reactants are uniformly mixed, and the polysiloxane resin molecules and the aluminum source molecules fully react. The reaction solution is subjected to distillation treatment to remove the solvent and small molecular substances, and the ceramic precursor is obtained. The raw materials used in the preparation method are all commercial reagents, and the raw materials are widely sourced. The synthesis route of the precursor is simple, and the cost is low.

A negative electrode material, and a negative electrode plate, an electrochemical device, and an electronic device including the same. The negative electrode material includes SiMxCy, where 0.5≤x≤2, 0.5≤y≤4, and M includes at least one of boron, nitrogen, oxygen, or aluminum; for SiMxCy, a particle size at a quantity accumulation degree of A % is DNA, a particle size at a volume accumulation degree of B % is DVB, and a half-peak width of a quantity distribution curve is ΔDN; and 2 μm≤(DV50−DN50)≤6 μm, and 1≤(DN99−DN1) / ΔDN≤1.3. The use of the negative electrode material, and the negative electrode plate, the electrochemical device and the electronic device including the same according to the present application achieve good cycle performance and energy density.

The invention relates to the technical field of titanium metallurgy, and discloses a method for directionally converting titanium-containing slag into TiCxOy-containing composite slag, which comprises the following steps: putting titanium-containing slag containing perovskite phase and a carbonaceous reducing agent into a reactor; heating the materials in the reactor to carry out carbon thermal reduction reaction; cO-containing gas generated in the reaction process is discharged, converted slag is obtained, and the slag is multiphase composite slag comprising the TiCxOy phase and the melilite phase. According to the method, phase transformation is accurately controlled, the obtained product is the composite slag containing TiCxOy and melilite, the composite slag can be directly used as a downstream chlorination raw material without complex crushing and magnetic separation iron removal procedures, the technological process is greatly shortened, and the equipment investment and operation cost are reduced.

A Composition of matter defined by the general formula of M1M2M3M4M5M6M7M8M9X3, wherein: X is Carbon; and M1, M2, M3, M4, M5, M6, M7, M8 and M9 each represent a different transition metal selected from the group consisting of Ti, Ta, Sc, Cr, Zr, Hf, Mo, and Nb.

Provided are methods of effecting cation exchange in MXene materials so as to stabilize the materials. Also provided are compositions, comprising layered MXene materials that comprise an organic cation between layers. Also provided are MXene compositions comprising a chalcogen disposed thereon, the MXene composition further optionally comprising a quaternary ammonium halide disposed thereon.

The invention belongs to the technical field of electromagnetic shielding materials, and relates to a transition metal thiocarbide composite film with electromagnetic shielding effectiveness and a preparation method and application thereof. The invention discloses a transition metal thiocarbide composite film with electromagnetic shielding effectiveness, which is of a three-layer structure and sequentially comprises a first cellulose-polyvinyl alcohol supporting layer, a transition metal thiocarbide layer and a second cellulose-polyvinyl alcohol supporting layer, transition metal sulfur carbide in the transition metal sulfur carbide layer is M2X2C, M is transition metal elements including at least one of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, and X is chalcogenide elements including at least one of S and Se. The transition metal thiocarbide composite film with high flexibility and high electromagnetic shielding effectiveness is successfully prepared through a layer-by-layer stacking structure of the cellulose-polyvinyl alcohol supporting layer / the transition metal thiocarbide layer / the cellulose-polyvinyl alcohol supporting layer.

An oxide material which contains a compound represented by the following formula: MQaOb (in the formula, M is at least one element selected from the group consisting of Group 3, Group 4, Group 5, Group 6 and Group 7, Q is at least one element selected from the group consisting of Group 12, Group 13, Group 14, Group 15 and Group 16 (excluding O), a is 0-2 (inclusive), and b is greater than 0 and 2 or less. ), and contains a metal element and / or a semimetal element on the surface and / or between layers thereof, and the halogen element content is 0.90 mass% or less.

The invention relates to the technical field of preparation of transition metal carbide materials, in particular to a synthesis method of an M '1.33 R0. 67 M ''2AlC3 MAX phase and a preparation method of a two-dimensional M' 1.33 M'' 2C3 MXene material. Aiming at specific synthesis obstacles caused by high stability of carbides of high-inertia M elements such as Ta and the like, an R element is introduced as a phase forming accelerant, and a high-purity ordered MAX phase containing Mo and Ta elements, which cannot be obtained before, is successfully synthesized. The auxiliary phase forming effect of rare earth is critical and indispensable, and the effect is not necessary in an M element (such as Nb) system with high activity. The two-dimensional M '1.33 M ''2C3 MXene material which is prepared from the specific precursor, has an ordered vacancy structure and is high in performance has excellent conductivity, can be used as a carrier to be compounded with metal phosphide, and provides excellent electrocatalytic oxygen evolution performance.

The invention discloses a method for preparing lithium sulfide through sectional reaction, and belongs to the technical field of lithium sulfide preparation. The method adopts a two-stage reaction process and comprises the following steps: continuously adding molten sulfur into a reaction furnace filled with burnt red carbon in an inert atmosphere at 800-1100 DEG C, carrying out pre-reaction to generate sulfur-containing carbon disulfide gas, and introducing the sulfur-containing carbon disulfide gas into a main body reaction chamber filled with lithium salt; and then carrying out gas-solid reaction at 400-700 DEG C for 5-20 hours, and circularly introducing sulfur-containing gas which does not participate in the reaction in the reaction to ensure that the reaction is fully carried out. And after the reaction is finished, continuously introducing inert gas for 0.5-1 hour, condensing the tail gas, adsorbing sulfur-containing gas in the tail gas by using activated carbon, and finally naturally cooling the main body reaction chamber to room temperature to obtain a lithium sulfide product. The process realizes source impurity control, is lower in energy consumption, greatly improves the utilization rate of raw materials, is less in pollutant emission, is high in product purity, is simple and convenient, and is suitable for industrial large-scale production.

An oxide material comprising: one or more selected from the group consisting of a nanofiber, a two-dimensional substance, or an amorphous substance of a material represented by: MQaOb wherein M is one or more elements selected from the group consisting of Groups 3, 4, 5, 6, and 7, Q is one or more elements selected from the group consisting of Groups 12, 13, 14, 15, and 16, and excluding O, a is 0 to 2, and b is more than 0 and 2 or less, wherein in a Raman spectrum, an average intensity of the oxide material at 745 to 765 cm−1 is smaller than an average intensity at 735 to 745 cm−1, and wherein a pore volume of the oxide material is 0.060 cc / g or more.

The application discloses porous carbon-rich SiOCN nanospheres with excellent wave-absorbing performance and a preparation method thereof, and comprises the following steps: S1, dropping SiOC ceramic precursor into a hydrolysis solution and stirring to obtain a SiOC ceramic precursor mixed solution; S2, adding an acid catalyst into the mixed solution and stirring to hydrolyze the SiOC ceramic precursor; S3, continuously adding an alkali catalyst after the hydrolysis and stirring to form a SiOC nanosphere particle mixed solution through polycondensation; S4, adding a carbon phase precursor into the SiOC nanosphere particle mixed solution and stirring, centrifuging and drying to obtain porous carbon-rich nanosphere precursors; and S5, pyrolyzing the porous carbon-rich nanosphere precursors under a protective atmosphere to obtain the porous carbon-rich SiOCN nanospheres; and the weight ratio of the SiOC ceramic precursor, the acid catalyst, the alkali catalyst and the carbon phase precursor is (5-15):(0.5-2.0):(1-10):(2-6).

The application provides a preparation method of carbon composite divalent silicon material, comprising the following steps: grinding silicon-containing biomass into solid powder, mixing the solid powder with a metal oxalate mixture, calcining under an inert atmosphere, performing a carbothermic reduction reaction, and removing impurities to obtain the carbon composite divalent silicon material; the metal oxalate mixture is composed of two metal oxalates, namely a first metal oxalate and a second metal oxalate; the first metal oxalate is selected from one of tin oxalate or manganese oxalate; the second metal oxalate is selected from one of manganese oxalate, iron oxalate or zinc oxalate; the first metal oxalate is different from the second metal oxalate; and the molar ratio of the first metal oxalate to the second metal oxalate is 10:1-3. The molten metal ball formed by the metal oxalate mixture during high-temperature calcination catalyzes the reduction of tetravalent silicon in the silicon-containing biomass into divalent silicon, the catalytic efficiency is high, and the energy consumption and production cost of the reaction are reduced.

To provide an interlayer asymmetrically aligned multi-element MAX phase and MXene.SOLUTION: The disclosed MAX phase has a layered structure of M(n+1)AXn comprising a plurality of transition metal layers (where n is a natural number, and n and n+1 indicate the number of layers), wherein M comprises two or more transition metal elements, X comprises nitrogen or carbon, A comprises at least a first element and a second element that are different from each other and selected from Group 13 elements, Group 14 elements, Group 15 elements, and Group 16 elements, a difference in atomic radius between the first element and the second element is 0.1 Å or more, and among the transition metal layers, a first transition metal layer and a second transition metal layer corresponding to outermost layers opposed to each other have compositions different from each other, whereby the MAX phase and MXene have an interlayer asymmetrically aligned structure.SELECTED DRAWING: Figure 1

An oxide material comprising: one or more selected from the group consisting of a nanofiber, a nanowire and a two-dimensional substance, represented by the formula: MQ a O b , wherein M is one or more elements selected from the group consisting of groups 3, 4, 5, 6 and 7, Q is one or more elements selected from the group consisting of groups 12, 13, 14, 15 and 16, excluding O, a is 0 or greater and 2 or less, and b is greater than 0 and 2 or less; and a metallic element and / or metalloid on a surface and / or between layers, wherein the total content of halogen elements is 0.90 wt.% or less.

This invention provides low-oxygen vanadium aluminum carbide (V2AlC) max for producing high-purity vanadium maxine, and a method for producing the same.

A method for producing a hydrocarbon, including: preparing a molten salt containing an oxide of a first metal; adding carbon dioxide to the molten salt; obtaining precipitates containing a first metal carbide by applying a voltage to the molten salt containing carbon dioxide; and obtaining a gas containing a hydrocarbon and a hydroxide of the first metal by hydrolyzing the first metal carbide.

The invention discloses a lithium ion battery metal defect MAX phase negative electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The self-propagating high-temperature solid-phase one-step method is combined, a large batch of double-transition metal materials are simply and efficiently prepared, the metal defect type MAX phase material is obtained through HF etching, compared with a traditional MAX phase material, metal vacancies are introduced into the etched metal defect type MAX phase material, more active sites are provided for ion intercalation / deintercalation, and the metal defect type MAX phase material can be used for preparing the MAX phase material. Meanwhile, the structural stability of the MAX phase material is also considered. Compared with the traditional MAX phase material, the material prepared by the invention shows excellent long cycle stability, and can effectively relieve the problem of volume expansion in the charge-discharge process, thereby prolonging the service life of the battery. The material can promote rapid transmission of electrons and lithium ions, and the overall performance of the battery is further improved.