43results about How to "Small specific surface area" patented technology

The invention relates to a uniform carbon-coated mesoporous silicon carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that a product obtained after pyrolysis and carbonization of a biomass carbon source is subjected to alkali activation treatment, acid pickling, drying, smashing, passivation, water washing and drying are conducted to obtain a mesoporous carbon matrix, nanometer silicon particles are deposited in pores of the mesoporous carbon matrix, and the uniform carbon-coated mesoporous silicon carbon negative electrode material is obtained. Then selecting a low-temperature carbonization material and polyethylene glycol to perform pre-carbonization and complete carbonization treatment on the mesoporous silicon carbon material to obtain a carbon coating layer, and finally obtaining the uniform carbon-coated mesoporous silicon carbon negative electrode material. When the uniform carbon-coated mesoporous silicon carbon negative electrode material is applied to a lithium battery, the mesoporous skeleton can effectively inhibit volume expansion of silicon in a battery circulation process, and the uniform carbon-coated layer can effectively reduce the risk of direct contact between the negative electrode material and an electrolyte, so that a stable SE I film is formed to reduce the occurrence of side reactions; and the first coulombic efficiency and the cycle performance of the battery are further improved.

The application discloses a preparation method of a sodium ion battery hard carbon negative electrode material based on step-by-step synergistic regulation, and comprises the following steps: S1, biomass pretreatment; S2, low-temperature pre-carbonization to obtain biomass pre-carbonized carbon; S3, physical activation: the pre-carbonized carbon is placed in an activation atmosphere to perform medium-temperature activation, and biomass activated carbon is obtained; S4, high-temperature carbonization: the biomass activated carbon is placed in an inert atmosphere to perform high-temperature carbonization, and a hard carbon intermediate is obtained; S5, chemical vapor deposition coating: the hard carbon intermediate is placed in a mixed atmosphere of a coating carbon source and an inert gas to perform chemical vapor deposition coating, and a surface-coated biomass hard carbon negative electrode material is obtained. The application can realize a higher closed pore volume at a milder temperature, and the synergistic regulation pore forming mode of activating and forming pores first and then high-temperature closing pores also avoids the insufficient closed pores caused by single high-temperature treatment.

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

This invention belongs to the field of battery materials technology, and discloses a single-crystal lithium nickel manganese oxide material, its preparation method, and a lithium-ion battery. The single-crystal lithium nickel manganese oxide material contains Li... x Ni 2‑x The percentage content of O2 is C≤1.6%, C=(I LixNi2‑xO2 / (I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 ))×100%, I LixNi2‑xO2 For Li in the XRD refinement results x Ni 2‑x The diffraction peak intensity corresponding to O2, I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 To add LiNi to the XRD refinement results 0.5 Mn 1.5 O4 and Li x Ni 2‑x The diffraction peak intensity of the O2 two-phase model indicates a grain size of 5–11 μm. The aforementioned single-crystal lithium nickel manganese oxide material was prepared via a lithium-deficient high-temperature sintering and lithium-replenished low-temperature sintering process. Li x Ni 2‑x Large-particle monocrystalline lithium nickel manganese oxide materials with low O2 content avoid electrolyte decomposition under high voltage, thus preventing the generation of HF and Li. x Ni 2‑x The O2 reaction can effectively improve the cycle stability of the battery. Simultaneously, the high compaction density of monocrystalline lithium nickel manganese oxide material can enhance the battery's energy density, thermal stability, mechanical properties, and durability. The method for preparing monocrystalline lithium nickel manganese oxide material in this invention is relatively simple, reliable, and effective, and can utilize existing production lines.

The application discloses a kind of composite heat-conducting fillers, the composite heat-conducting filler is graphene oxide wraps aluminium oxide composite heat-conducting filler, wherein aluminium oxide is in situ grown on the surface of graphene oxide, then through special drying technique to form the microsphere structure of graphene oxide wrapping on the surface of aluminium oxide.The application also discloses a kind of graphene in-situ modified heat-conducting gel, containing the composite heat-conducting filler described above.The application also discloses its preparation and application.In the product prepared in the embodiment of the application, graphene is wrapped on the surface of aluminium oxide, and the two are mutually overlapped, mutually synergistic, form the special compounding effect of two-dimensional and zero-dimensional spherical, construct three-dimensional, extensive heat-conducting network structure, realize high thermal conductivity and high extrusion rate under lower filling amount.

This invention discloses a hard carbon material with ultra-high platform capacity, its preparation method, and its applications. The hard carbon material is prepared by hydrothermal reaction and high-temperature carbonization, with a particle size of 2-4 μm, a pore size of 0.4-200 nm, and a specific surface area of ​​no more than 15 m². 2 / g, with a platform capacity ratio of not less than 40%; the preparation method of hard carbon material is as follows: S1: Add surfactant to pectin aqueous solution for hydrothermal reaction, and obtain hard carbon microspheres after filtration and drying; S2: Carbonize the hard carbon microspheres of S1 at high temperature under an inert atmosphere, and obtain hard carbon material with ultra-high platform capacity after cooling. The hard carbon material of the present invention can be used as a negative electrode material for lithium-ion batteries, which can significantly improve the platform capacity ratio.

The present application relates to a kind of preparation method and application of metal phthalocyanine-graphite phase carbon nitride / graphene ternary composite material, it solves the problem of poor dispersibility, easy aggregation and poor conductivity of metal phthalocyanine material as electrocatalyst.Existing Preparation method steps include: metal phthalocyanine, graphite phase carbon nitride are added to sulfuric acid, after heating stirring, solution A is prepared by cooling;Solution B is prepared by stirring after adding sodium nitrite to solution A under ice bath;Graphene oxide is ultrasonically dispersed in distilled water to prepare solution C;Solution B is added dropwise to solution C and stirred, then ascorbic acid is added and stirred, the product is centrifuged, washed and dried to prepare metal phthalocyanine-graphite phase carbon nitride / graphene ternary composite material.The ternary composite material prepared by the method is a two-dimensional sheet structure, has high dispersibility, large specific surface area, good conductivity and structural stability;The product of the present application can be used for electrocatalytic reduction of carbon dioxide.

The invention relates to the technical field of gas adsorption materials, in particular to a dissimilar metal-organic framework confinement polyaniline composite adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: adopting chromium-copper dissimilar metal matching, and constructing a stable Lewis acid site in an MIL-101 skeleton; introducing a sulfonic acid group through a ligand exchange strategy, and establishing a Bronsted acid site; and finally, carrying out confinement polymerization on aniline in MOF pore channels to form rich hydrogen bond binding sites so as to obtain the dissimilar metal-organic framework confinement polyaniline composite adsorbent. According to the dissimilar metal-organic framework confined polyaniline composite adsorbent disclosed by the invention, through triple synergistic effects of dissimilar metal Lewis acid sites, sulfonic acid group Bronsted acid sites and polyaniline hydrogen bond sites, a multiple ammonia gas capture mechanism is constructed, and the adsorption efficiency and adsorption effect on ammonia gas are remarkably improved.

This application discloses a hollow cage-like silicon-carbon composite anode material and its preparation method. The hollow cage-like silicon-carbon composite anode material has an internally hollow cage-like structure. The cage-like structure is formed by the self-assembly of a 3D network structure, which includes a framework and multiple carbon spheres. The framework includes silicon material, specifically one-dimensional linear silicon material, and the multiple carbon spheres are attached to the silicon material. Compared to existing porous carbon frameworks, the hollow cage-like silicon-carbon composite anode material disclosed in this application not only has higher capacity and conductivity but also possesses the flexibility lacking in porous carbon. When other anode materials, especially silicon-based anode materials, are loaded into the hollow structure, the cage-like structure can provide more expansion space for the internal anode material, thereby more effectively improving the cycle stability of the anode material.

The invention provides a grease hydrodeoxygenation catalyst and a preparation method and application thereof, the preparation method comprises the following steps: mixing an aluminum-containing inorganic porous material, an acidic solution, an extrusion aid, a magnesium salt and a nickel salt, then carrying out extrusion molding to obtain a carrier precursor, and drying and roasting the carrier precursor to obtain a hydrodeoxygenation composite carrier; by taking the total weight of the carrier as 100%, the content of the magnesium element is 0.5-10%, and the content of the nickel element is 0.3-2%; dipping the hydrodeoxygenation composite carrier with a dipping solution containing active metal, and then drying and roasting to obtain the grease hydrodeoxygenation catalyst. When the hydrodeoxygenation composite carrier is prepared, magnesium salt and nickel salt are combined, and the hydrodeoxygenation composite carrier with a nickel-doped magnesium aluminate spinel structure can be obtained. The hydrodeoxygenation composite carrier has good hydrothermal stability and mechanical strength. The grease hydrodeoxygenation catalyst prepared by loading an active metal component on the hydrodeoxygenation composite carrier is stable in deoxygenation activity and excellent in deoxygenation effect.

The application belongs to the field of nanomaterial preparation and processing, and mainly relates to a preparation method and application of carbon quantum dot gel material based on front-end polymerization means. Acrylamide, 1-vinyl-2-pyrrolidone and hydroxypropyl acrylate are used as hydrogel monomers, the hydrogel monomers, carbon quantum dot monomers citric acid and polyethyleneimine and an oxidant ammonium persulfate are dissolved in a solvent, and then a reducing agent N, N, N', N'-tetramethyl ethylenediamine is added and uniformly mixed to obtain a front-end polymerization solution; the surface of the front-end polymerization solution is heated and induced to obtain the carbon quantum dot gel material based on the front-end polymerization means; and then a microfluidic electrospinning technology is used to form a carbon quantum dot gel material composite film which can be used for wound dressings in cooperation with a degradable biopolymer material, so that the problems of small specific surface area and low porosity of the hydrogel material directly used as a wound dressing are further solved, and the effect of the wound healing application is optimized.

The invention relates to the technical field of chemical mechanical polishing of semiconductors, in particular to a preparation method of low-specific-surface-area silica sol, which comprises the following steps: adding pure water into crude silica sol prepared by taking alkoxy silane as a silicon source, and stirring at low vacuum degree to obtain the low-specific-surface-area silica sol, the mass ratio of the added pure water is w, the vacuum degree is v / MPa, the temperature is T / DEG C, the stirring duration is t / h, and the following relational expression is met: 0.02 < = 300 * w * v / (t * logT) < = 0.04; wherein the mass ratio w of the added pure water is 6-35%, w = the mass of the pure water / the mass of the crude silica sol * 100%, the vacuum degree v is 0.005-0.03 MPa, the temperature T is 70-95 DEG C, and the stirring time t is 8-12 h. The post-treatment process is added, and the mass ratio w of the added pure water, the vacuum degree v, the temperature T and the stirring duration t are controlled to meet a certain relationship, so that the alcohol content of the system can be reduced on the basis of reducing the specific surface area of the silicon dioxide particles, and the silica sol with higher polishing efficiency and better polishing effect is obtained.

The application provides a lithium iron phosphate positive electrode material, a preparation method thereof and an electrochemical device. The lithium iron phosphate positive electrode material comprises first particles with a particle size of 1000 nm or more and second particles with a particle size of 500 nm or less. The carbon content of the first particles is 0.4%-0.8%, the specific surface area of the first particles is 4 m 2 / g-8.0 m 2 / g, the carbon content of the second particles is 1.5%-2.0%, and the specific surface area of the second particles is 15 m 2 / g-20 m 2 / g. The first particles and the second particles have carbon content and specific surface area adjusted, and are mixed and graded so that the lithium iron phosphate positive electrode material has high compactness and long cycle performance.

The application relates to the technical field of battery materials and preparation methods, and is a high-initial Coulomb efficiency hard carbon material for a sodium ion battery negative electrode and a preparation method thereof.The high-initial Coulomb efficiency hard carbon material for the sodium ion battery negative electrode comprises the following steps: extruding a carbon precursor into a carbon column; removing volatile components in the carbon column after shaping through low-temperature carbonization; directly electrically heating the carbon column after the low-temperature carbonization and maintaining for a specific time length; and crushing the carbon column after cooling to a particle size of less than 32 um to obtain the high-initial Coulomb efficiency hard carbon material for the sodium ion battery negative electrode.The high-pressure compression of the porous biomass precursor greatly reduces the open pore volume of the biomass carbon, and the specific surface area of the material is reduced; in the subsequent pyrolysis and low-temperature carbonization processes, the tightly extruded biomass particles inhibit the volatilization of volatile components, more volatile components are decomposed into carbon, the carbon yield is improved, the closed pores are promoted to be generated, and then the high-initial-efficiency hard carbon product is prepared.

The invention belongs to the technical field of metallurgy, and particularly relates to superfine particle tungsten carbide powder and a preparation method and application thereof.The preparation method comprises the following steps that S1, carbon paste, hydrochloric acid and an ammonium tungstate solution are obtained, the carbon paste and the hydrochloric acid are subjected to first ultrasonic stirring, and a first mixed solution is obtained, performing second ultrasonic stirring on the ammonium tungstate solution and the first mixed solution to obtain a second mixed solution, washing the second mixed solution with pure water, and drying to obtain a tungstic acid and carbon precursor mixture; s2, calcining the tungstic acid and carbon precursor mixture to obtain a tungsten oxide and carbon mixture; s3, the tungsten oxide and carbon mixture is subjected to first carbonization, crushing and sieving, and first tungsten carbide powder is obtained; and S4, the first tungsten carbide powder is subjected to carbon blending to obtain second tungsten carbide powder, and the second tungsten carbide powder is subjected to second carbonization, crushing and sieving to obtain the ultrafine particle tungsten carbide powder. According to the preparation method, the ultrafine particle tungsten carbide powder with the specific surface area of 2.0-3.0 m < 2 > / g, the combined carbon content of 6.10-6.11 wt% and the free carbon content of 0.03-0.04 wt% is prepared by adopting carbon thermal reduction and step-by-step carbonization.

The utility model provides a vacuum dehydration and degassing device for electronic pouring sealant, which relates to the technical field of electronic pouring sealant production and comprises a shell, a sealant distributor, a dispersion frame and a vacuum pump. The shell comprises an inner cavity; the inner cavity is sequentially divided into a glue distribution cavity, a dispersion cavity and a storage cavity from top to bottom; a discharge hole is formed in the bottom of the storage cavity; the glue distributor is located in the glue distributing cavity, and the glue inlet end of the glue distributor is connected with a glue distributing pipe; the dispersing frame is mounted in the dispersing cavity; the dispersing frame comprises an upper frame plate and a lower frame plate; the middle part of the upper frame plate is arched towards one side of the glue distribution cavity; the middle of the lower frame plate sinks towards one side of the storage cavity; dispersing holes are formed in the upper frame plate and the lower frame plate; the vacuum pump is connected with the glue distributing cavity and the dispersing cavity through air pipes. The continuous operation of glue solution treatment and vacuum degassing is realized, the shutdown waiting time caused by alternation of material preparation devices is eliminated, and the production cycle is obviously shortened.

The application discloses a spray pyrolysis device and a method for preparing ternary positive electrode precursors by using the same. The spray pyrolysis device comprises a feeding unit, a spraying unit and a pyrolysis unit; a first unit, a second unit and a third unit are sequentially arranged in a cavity of the spraying unit; an atomizing device is arranged at an outlet of the third unit; the first unit, the second unit and the third unit are heated by a first ultrasonic wave generating assembly, a second ultrasonic wave generating assembly and a third ultrasonic wave generating assembly respectively; the atomizing device is communicated with the pyrolysis unit, so that atomized liquid generated by the atomizing device enters the pyrolysis unit; a ignition device is arranged at an inlet of the pyrolysis unit; P1 < P2 < P3. The spray pyrolysis device can avoid the problems of particle breakage and hollowing of the positive electrode material precursor, so that the tap density of the positive electrode material precursor is high, the specific surface area is low, and the chlorine content is low, thereby improving the energy density, cycle performance and safety performance of the positive electrode material, and reducing the preparation cost.

This application relates to the field of metal powder preparation technology, and in particular to a method for preparing silver powder for ultrafine line printing, comprising the following steps: preparing a silver ammonia solution and adding a dispersant, stirring to dissolve, adding a reducing agent solution, and aging to obtain nano-silver sol; forming a mixture of an initiator and deionized water, preparing aqueous solutions of acrylic acid and acrylamide separately, and adding them to the mixture for reaction, cooling and filtering to obtain an acrylic acid-acrylamide copolymer; weighing silver nitrate and deionized water, stirring to obtain solution A; weighing a reducing agent and deionized water, adjusting the pH to 1-2, and then adding the nano-silver sol and acrylic acid-acrylamide copolymer to obtain solution B; rapidly adding solution A to solution B, adding a surface modifier after the reaction is complete, aging, centrifuging, washing, and drying. The silver powder prepared by this application has the advantages of small average particle size, good overall uniformity, and small surface area, making it suitable for the field of ultrafine line printing.

The invention provides pseudo-boehmite with high specific surface area and large pore volume, a preparation method thereof and a hydrogenation catalyst.The preparation method comprises the steps that an excessive NaOH solution and associated aluminum ore are mixed and boiled, aluminum hydroxide is leached out, and a sodium metaaluminate solution containing impurities is obtained; mixing the sodium metaaluminate solution containing the impurities with a precipitant to precipitate the impurities so as to obtain a sodium metaaluminate purified solution; mixing sulfuric acid and the sodium metaaluminate purified liquid, and reacting to obtain turbid liquid containing pseudo-boehmite; mixing the turbid liquid containing the pseudo-boehmite with hydroxyl carboxylate to enable the pseudo-boehmite to be electronegative, so as to obtain an electronegative pseudo-boehmite turbid liquid; and mixing the electropositive aluminum ions and the electronegative pseudo-boehmite suspension to obtain the pseudo-boehmite with high specific surface area and large pore volume. The low-cost hydrogenation catalyst prepared from the pseudo-boehmite with high specific surface area and large pore volume has the characteristics of high specific surface area and large pore volume, has higher catalytic activity, contains more impurities, and has stronger market competitiveness.

The application discloses a preparation method of a self-template nitrogen-doped sugarcane residue biochar electrode material and application thereof, and the preparation comprises the following steps: placing repeatedly cleaned sugarcane residue in a tubular furnace, and performing low-temperature carbonization under a nitrogen atmosphere. Then, the product after low-temperature carbonization is uniformly mixed with potassium hydroxide with a certain mass ratio in a mortar, and then the uniformly mixed sample is placed in the tubular furnace to perform activation under a nitrogen atmosphere. Finally, the obtained activated product is neutralized with hydrochloric acid to neutralize excessive alkali, then washed with deionized water until neutral, and vacuum dried to obtain the self-template nitrogen-doped sugarcane residue biochar electrode material. In the application, cheap and easily obtained sugarcane residue is used as a raw material to prepare a tubular structure biochar for electric adsorption, and no additional template is needed. Compared with similar technologies, the electrode is more excellent in effect and lower in cost, achieves the purpose of waste treatment with waste, and is an effective technical approach to realize the double carbon.

The invention belongs to the technical field of textile materials, and provides a high-strength antibacterial bio-based composite yarn and a preparation method thereof.The preparation method comprises the steps that S1, chitosan is dissolved in an acetic acid aqueous solution to form a spinning solution, supercritical CO 2 drying is conducted after wet spinning, coagulating bath forming and solvent replacement, and chitosan aerogel fibers are obtained; s2, the chitosan aerogel fibers and lyocell fibers are subjected to opening and mixing, and non-crosslinked composite yarns are spun through a ring spinning technology; and S3, pretreating the non-crosslinked composite yarn by using a CA aqueous solution, cleaning and drying, then carrying out a crosslinking reaction by using an EGDE aqueous solution, and cleaning and drying to obtain the high-strength antibacterial bio-based composite yarn. The chitosan aerogel fibers and the lyocell fibers are subjected to composite spinning and then subjected to multi-step cross-linking treatment, the mechanical property is improved, meanwhile, the antibacterial performance is reserved and enhanced, collaborative optimization of the material performance is achieved, and the tensile strength, the antibacterial durability and the wearing comfort of the composite yarn can be remarkably improved.

The application discloses a preparation method of a closed micropore structure sodium ion battery negative electrode hard carbon material, and comprises the following steps: S1, preparation of a precursor mixed solution: biomass raw material powder and an inorganic acid pore former are used to prepare the precursor mixed solution; S2, carbon precursor drying: the precursor mixed solution is dried to prepare the carbon precursor; S3, pore forming of a closed pore carbon intermediate: the carbon precursor is subjected to high-temperature activation reaction to obtain the closed pore carbon intermediate with a micropore structure after activation; S4, closed pore carbon intermediate refining treatment: the carbon intermediate is crushed and refined, and the refined closed pore carbon intermediate is obtained through sieving; and S5, high-temperature carbonization of the hard carbon material: the refined carbon intermediate obtained in the step S4 is subjected to high-temperature carbonization to obtain the hard carbon material with the closed micropore structure. The application has the characteristics of a green and environment-friendly process, a small specific surface area and excellent electrochemical performance.

The present application relates to the technical field of preparation of tritium breeder, in particular to a method for batch preparation of Li2TiO3 tritium breeding microspheres and rich phase structure by centrifugal granulation, comprising the following steps: S1, Li2TiO3 ceramic powder is pretreated by spray granulation, then sprayed with a solution of xanthan gum for granulation, and sieved to obtain a green body; S2, the green body is added into a centrifugal granulator, and a second binder solution is sprayed at the same time, so that Li2TiO3 microsphere seeds with a preset diameter are generated by centrifugal granulation; S3, then the second binder solution is sprayed while lithium-containing ceramic powder is added for granulation and bonding; S4, the process of S3 is repeated until ceramic microsphere green bodies with the required diameter are obtained; S5, then deionized water is sprayed in the granulator and continues to roll for 3-8 min; S6, the ceramic microspheres obtained in S5 are dried at constant temperature and humidity, degummed, and sintered. The method can realize batch preparation of high-lithium-content tritium breeding microspheres with single-phase structure or multi-phase structure.

This invention discloses a method for preparing silica microspheres, the prepared silica microspheres, and their applications. The method for preparing silica microspheres includes: (1) heating a mixture of n-alkane and pitch under reflux to separate a solid product; (2) mixing the solid product from step (1) with a mixture of aromatics I, a first silicon source, a polyoxyethylene-polyoxypropylene-polyoxyethylene copolymer, and water to obtain a crystallization solution, followed by hydrothermal crystallization and calcination to obtain an intermediate product; (3) mixing the intermediate product from step (2), a second silicon source, a pore-forming agent, and water to obtain a slurry; then, spray-drying and calcining the slurry to obtain the silica microspheres. The silica microspheres prepared by this method have the advantages of large specific surface area, large pore volume, and large average pore size, which significantly improves polymerization activity in olefin polymerization reactions.

This application provides an anode material for solid-state batteries, a method for preparing the same, and a solid-state battery, relating to the field of solid-state batteries. The anode material includes secondary particles, which are spherical in shape and formed by stacking multiple primary particles. The primary particles include graphite and a coating layer distributed on at least a portion of the graphite surface. The coating layer is made of at least one of titanium dioxide, alumina, lithium niobate, lithium zirconate, lithium fluoride, silicon, and tin. The anode material of this application, comprising graphite and a coating layer on the graphite surface, effectively physically isolates the graphite from the contact with the sulfide solid electrolyte, significantly suppressing side reactions at the interface and effectively improving the first-cycle coulombic efficiency and cycle stability of the anode material.

The application relates to the technical field of batteries, in particular to a negative electrode material, a preparation method thereof and a battery. The negative electrode material comprises a substrate and a carbon coating layer coated on at least part of the surface of the substrate; wherein the substrate comprises hard carbon, the hard carbon is a biomass-based hard carbon material, and the hard carbon contains C elements and O elements, and the atomic ratio of O and C satisfies O:C=1:20-1:10. The preparation method of the negative electrode material comprises the following steps: soaking pretreated biomass material in a chloride solution, sintering to obtain a hard carbon precursor; mixing the hard carbon precursor with an acid solution, adding peroxodisulfate, and after mixing, separating and drying, obtaining a hard carbon material containing an epoxy group; performing carbon coating treatment on the hard carbon material containing the epoxy group to form a carbon coating layer on at least part of the surface of the hard carbon, and obtaining the negative electrode material. The application can improve the capacity and kinetic performance of the negative electrode material, and improve the capacity, initial efficiency and cycle performance of the battery.

This invention provides a method for preparing porous anode aluminum foil for electrolytic capacitors based on laser additive manufacturing, comprising the following steps: selecting aluminum foil with a thickness of 30 μm and aluminum powder particles with an average particle size of 5-6 μm as raw materials; adding the aluminum powder particles to the aluminum foil through a feeding hopper, and controlling the thickness of the aluminum powder particles using a vibrating scraper below the feeding hopper, so that the aluminum powder is basically spread in a single layer on the aluminum foil to ensure the single-layer distribution of aluminum spheres; adding a dispersant to the raw materials to prevent the spheres from clumping; and adding high-frequency vibration with an amplitude of micrometers to the scraper at the outlet of the feeding hopper to facilitate the single-layer spread of spheres and to cover the entire plane; using a linear laser to weld the aluminum powder particles, completely welding the covered aluminum metal particles. After one side of the aluminum foil is completely welded with the aluminum powder particles, the aluminum foil is flipped over by a flipping device, and then the other side of the aluminum foil is covered and welded with the aluminum powder particles. The preparation method provided by this invention solves the problems of decreased specific surface area and decreased porosity or capacitance of electrode foil in the electrode foil manufacturing process.

This invention discloses a cubic bifunctional adsorbent material, its preparation method, and its applications. The preparation method includes the following steps: calcining a zeolite imidazole framework at a temperature above 800°C under an inert atmosphere to obtain the cubic bifunctional adsorbent material. The cubic bifunctional adsorbent material of this invention can simultaneously adsorb sulfonamide antibiotics and heavy metals. It also possesses a large specific surface area, numerous adsorption sites, abundant pore structure, large pore volume and diameter, and high adsorption capacity. It is a novel bifunctional adsorbent with excellent performance. When used to treat complex wastewater containing sulfonamide antibiotics and heavy metals, it can effectively remove these substances from the wastewater, demonstrating high practical value and promising application prospects. The preparation method of this invention also has advantages such as simple process, convenient operation, low cost, economic safety, and ease of promotion. It plays a significant role in promoting the large-scale preparation and industrial application of cubic bifunctional adsorbent materials.

The invention relates to the technical field of preparation of activated carbon composite materials, and discloses an iron-modified activated carbon composite material for promoting heavy metal repair and a preparation method of the iron-modified activated carbon composite material. The method comprises the following steps: (1) pretreating raw materials to obtain pretreated materials; (2) adding the pretreated material into a ferric chloride solution, stirring at 150rpm for 2 hours, carrying out ultrasonic oscillation dispersion for 30 minutes to obtain a turbid liquid, transferring the turbid liquid into a drying oven, and drying at 60 DEG C until the weight is constant to obtain an intermediate; and (3) grinding and sieving the intermediate, transferring into a muffle furnace for pyrolysis treatment, and naturally cooling. The obtained biochar has a complex internal pore structure, and is sufficient to provide sites for adsorption or combination of pollutants. Wherein the specific surface area and the pore volume of the biochar material are reduced through iron modification, the average pore size is increased, and the pH of the modified biochar is increased by adding the iron element, so that the adsorption capacity on metal cations (such as cadmium and lead) is enhanced.

The invention provides a foamed nickel surface treatment method, a prepared product and application of the product. The preparation method comprises the following steps: spraying a mixed solution of nano Fe3O4, carboxylated multi-walled carbon nanotubes and Nafion on the front and back surfaces of foamed nickel, drying for 5-7 hours, repeating the operation for multiple times, and drying at room temperature to obtain the nano Fe3O4 and carboxylated multi-walled carbon nanotube modified foamed nickel. The foamed nickel, the nano Fe3O4 and the carboxylated multi-walled carbon nanotubes used in the method are low in cost, and a loading method and a spraying method used in the method are simple, convenient and rapid. In addition, due to the porous structure of the foamed nickel, the loaded Nafion-carboxylated multi-walled carbon nanotubes and a foamed nickel framework can form a compact conductive network, and the nano Fe3O4 is an indispensable efficient hydrogen evolution active site in the network. Therefore, due to high conductivity, stability, high specific surface area and high hydrogen evolution activity, catalytic hydrogen evolution and methane production at the cathode of the anaerobic methanogenesis microbial electrolysis cell can be promoted.