50results about How to "Increase migration rate" patented technology

The invention discloses an all-organic polymer S-type heterojunction photocatalytic material and a preparation method and application thereof.The all-organic polymer S-type heterojunction photocatalytic material comprises a carrier and an organic polymer growing on the surface of the carrier, organic monomers are originally polymerized on the surface of carbon nitride to form an all-organic polymer S-type heterojunction, and the organic monomers are 1, 4-diacetylene benzene, 2, 4-diacetylene benzene and 2, 4-diacetylene benzene. The compound is 3, 5-diacetylene pyridine or 3, 6-diacetylene pyridazine; the preparation method comprises the following steps: (1) adding carbon nitride and a catalyst into a polar alkali solution, and uniformly mixing; and (2) putting an organic monomer into the mixed solution, and carrying out polymerization reaction to generate the all-organic polymer S-type heterojunction photocatalytic material in situ. The carbon nitride is selected as a carrier to be compounded with the organic conjugated polymer, the organic conjugated polymer can be adjusted to be matched with the energy band position of the carbon nitride by changing the molecular structure, an all-organic polymer S-shaped heterojunction is formed, the intramolecular charge transfer rate is higher, and the photocatalytic performance is improved.

The invention relates to the technical field of batteries, in particular to a surface modification method of a positive electrode. The surface modification method of the positive electrode provided by the invention comprises the following steps that an aluminum source, a carbon nano tube and the positive electrode are mixed and calcined, the surface-modified positive electrode is obtained, the addition amount of the aluminum source is 300 ppm to 900 ppm, and the addition amount of the carbon nano tube is 300 ppm to 900 ppm according to the mass of the positive electrode. The surface of the positive electrode material is modified by coating the positive electrode material with the carbon nanotubes and the aluminum source, on one hand, contact between the positive electrode material and an electrolyte can be isolated to a great extent, and the cycle performance of the material is improved, and on the other hand, the mixture formed by the carbon nanotubes and the aluminum source has good rapid ion and electron transmission performance, and has good electrochemical performance. The migration rate of lithium ions can be improved, the direct-current resistance of the positive electrode material can be reduced, and meanwhile, the increase of the direct-current resistance in the circulation process is inhibited.

The invention provides a preparation method and application of a donor-receptor type two-dimensional imino CTF photocatalyst, and belongs to the technical field of photocatalyst preparation.The preparation method of the CTF photocatalyst comprises the following steps that 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine, terephthalaldehyde and 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine are mixed according to a certain proportion, and the donor-receptor type two-dimensional imino CTF photocatalyst is obtained. The preparation method comprises the following steps: by taking 2, 5-dimethoxy terephthalaldehyde or 2, 5-dihydroxy terephthalaldehyde as a raw material, reacting in a mixed solution of mesitylene / dioxane / acetic acid in a certain proportion for 3 days by adopting an inert gas sealing-solvothermal method, centrifuging the obtained product, sequentially washing with tetrahydrofuran and acetone for multiple times, and carrying out vacuum drying, thereby obtaining the 2, 5-dimethoxy terephthalaldehyde / 2, 5-dihydroxy terephthalaldehyde. The two-dimensional triazine CTF photocatalysts with different donor-receptor types are obtained. The preparation method comprises the following steps: by taking acetonitrile as a solvent, dispersing a photocatalyst into an arylamine solution with a certain concentration, stirring for 0.5 hour in a dark place, and carrying out catalytic reaction under visible light (lambda is greater than or equal to 420 nm), so that the preparation of the high-efficiency catalytic arylamine oxidative coupling reaction under the visible light is realized.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery negative electrode material with monatomic sodium-philic sites as well as preparation and application of the sodium-ion battery negative electrode material. The method comprises the following steps: (I) dissolving sodium lignin sulfonate and metal salt in water according to a ratio, and putting the solution into a high-temperature and high-pressure reaction kettle for hydrothermal reaction; and (II) filtering, cleaning and drying a product after the hydrothermal reaction, mixing the product with a nitrogen source, and performing high-temperature carbonization in a high-temperature tubular furnace to obtain the sodium ion battery negative electrode material. In the preparation method, the hydrothermal product added with the metal salt is directly carbonized at a high temperature to prepare the hard carbon negative electrode material with rich micropore content, and the sodium ion battery negative electrode material with a monatomic sodium-philic site can be prepared by further converging a nitrogen source and carbonizing at a high temperature in the step II. According to the invention, the problems of slow sodium ion migration rate and relatively low reversible capacity in the existing hard carbon negative electrode material are solved.

The invention discloses a Co3O4-Cu2-xS composite photo-thermal catalyst as well as a preparation method and application thereof. The composite photo-thermal catalyst is prepared by taking a surfactant as a bridge and compounding Co3O4 and Cu2-xS. The composite photo-thermal catalyst has a reduced band gap width, can effectively promote migration and separation of photon-generated carriers, enhances the absorption efficiency of visible light-near infrared light, and shows excellent photo-thermal conversion performance. The composite photo-thermal catalyst can be used for constructing a Co3O4-Cu2-xS + PMS + NIR catalytic system, and peroxymonosulfate is activated under the irradiation of near-infrared light so as to degrade antibiotics in water. Experiments prove that the Co3O4-Cu2-xS + PMS + NIR system disclosed by the invention can achieve the degradation rate of 99% on levofloxacin within 20 minutes, and the generation efficiency of active species is remarkably improved through the synergistic effect of a photothermal effect and interface activation. The catalyst has broad-spectrum degradation activity on various antibiotics, keeps efficient and stable catalytic performance in a wide pH range, and shows excellent ion interference resistance and adaptability to various water bodies.

The application relates to the technical field of organic light-emitting display, and discloses a cyano-substituted aryl ring-connected triazine compound and application thereof. The cyano-substituted aryl ring-connected triazine compound has a structure as shown in formula (I), the compound provided by the application has high bond energy between atoms, good thermal stability, is conducive to solid-state stacking between molecules, is conducive to injection and migration of excitons, can effectively reduce the driving voltage of an organic electroluminescent device when used as an electron transport material, improves the light-emitting efficiency of the organic electroluminescent device, and prolongs the service life of the organic electroluminescent device. Meanwhile, the cyano substitution can adjust the energy level of the compound, the HOMO and LUMO energy levels are deepened, the compound is more matched with adjacent layers, and the device voltage is reduced. The application further provides an organic electroluminescent device and a display device containing the compound of formula (I).

The invention provides a pole piece of a lithium ion battery and a preparation method of the pole piece, the pole piece of the lithium ion battery comprises a current collector and an active material coated on the current collector, and by arranging the active material and an adhesive, the active material can be conveniently and rapidly fixed when being extruded and arranged on the current collector along an angle; the assembly state of the active material on the current collector is stabilized, the active material is placed in the slit die cavity to be extruded, the active material moves and deforms towards the single side direction, so that the structure becomes long and narrow, and the end part of the long and narrow active material is connected with the current collector to be rolled, so that the tortuosity of the lithium ion battery pole piece is reduced, and the service life of the lithium ion battery pole piece is prolonged. And the migration rate of lithium ions in the pole piece and the embedding rate of the lithium ions in the active material are accelerated, meanwhile, the problem that the pole piece is expanded and increased due to lithium ion embedding in the thickness direction of the pole piece is solved, and the probability of deformation of the lithium ion battery is reduced.

This invention discloses a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and crystal field. The method includes: first, filtering the polar lubricating oil containing trace amounts of water to remove mechanical impurities, then heating it to 25℃~35℃; then introducing it into an electric field polarization unit, where it is polarized using an electric field until the dielectric constant of the lubricating oil increases by 3%~8% relative to its initial value; next, introducing it into a crystal field unit, where it is stirred and mixed to fully contact an inorganic crystalline particle adsorbent with a superhydrophilic surface, using the adsorbent to remove water from the oil; finally, passing it through a fine filtration unit to remove the water-swollen inorganic crystalline particle adsorbent, thus completing the micro-water removal of the polar lubricating oil. This invention achieves efficient and deep dehydration of polar lubricating oil at room temperature, with advantages such as low energy consumption, low cost, no additive loss, and no impact on oil performance.

The embodiment of the application provides a kind of propane ammoxidation preparation acrylonitrile, it is related to acrylonitrile generation technical field;The method comprises: propane, ammonia and oxygen are mixed, and mixed gas is obtained;The mixed gas occurs ammoxidation under the action of metal oxide composite catalyst, and acrylonitrile is obtained;The metal oxide composite catalyst includes Mo-V base metal oxide, and also includes alkali metal or alkaline earth metal.The method of the present application has relatively mild reaction conditions, the yield can basically reach more than 60%, the selectivity can reach more than 80%, improves the raw material utilization rate, reduces energy consumption and equipment investment, thereby effectively reducing the production cost of acrylonitrile.At the same time, the process of the present application can effectively control the side reaction in the reaction process, reduce the generation of by-products, and reduce the difficulty of subsequent separation and purification of reaction products.

The invention belongs to the technical field of solid waste recycling. The invention discloses a method for realizing high-value recycling of secondary aluminum ash and synchronous deep defluorination and dechlorination by utilizing hydrothermal synthesis. The method comprises the following steps: firstly, pretreating secondary aluminum ash, then preparing the pretreated secondary aluminum ash and water into slurry, and adding a specific defluorinating agent and a dechlorinating agent into the slurry to construct a synchronous reaction system; the system is subjected to hydrothermal reaction under high-temperature and high-pressure conditions, so that fluorine and chlorine elements are respectively fixed and converted into stable compounds. Solid-liquid separation is carried out after the reaction is completed, an obtained solid product can be used as a raw material for preparing a zeolite molecular sieve or an aluminum-based material, and salt is recovered from a liquid part through evaporative crystallization. According to the method, deep removal of harmful elements and a high-value recycling process of beneficial components are coupled to a single hydrothermal system, and efficient harmless and high-value recycling utilization of the secondary aluminum ash is achieved.

The application provides a compound of formula (I), the bond energy between atoms is high, the compound has good thermal stability, and the solid-state stacking between molecules is favorable, and the energy level between adjacent layers is suitable, which is favorable for the injection and migration of excitons. When used as an electron transport material, the compound can effectively reduce the driving voltage of an organic electroluminescent device, improve the light-emitting efficiency of the organic electroluminescent device, and prolong the service life of the organic electroluminescent device. The application also provides an organic electroluminescent device and a display device comprising the compound of formula (I).

This invention belongs to the field of microencapsulation technology, and specifically relates to a high-lasting fragrance microcapsule and its preparation method. The preparation method of the high-lasting fragrance microcapsule provided by this invention includes the following steps: S101, mixing fragrance with hydrophilic particles and ultrasonically dispersing to obtain an oil phase; S102, mixing styrene-maleic anhydride copolymer, a strong acid-resistant anionic emulsifier, and a nonionic emulsifier, adjusting the pH, and stirring evenly to obtain an aqueous phase; S103, mixing melamine, formaldehyde, water, modifier A, and modifier B, heating and stirring, adjusting the pH, and cooling after the reaction to obtain a modified MF prepolymer; S104, adding the oil phase to the aqueous phase for emulsification to obtain an emulsion; S105, adding the modified MF prepolymer to the emulsion for crosslinking, adjusting the pH for curing, and then adding polyvinyl alcohol polymers and glutaraldehyde for secondary encapsulation to obtain the high-lasting fragrance microcapsule. The fragrance microcapsules prepared by this invention achieve a long-lasting fragrance effect and excellent wash resistance.

The application belongs to the technical field of iodine-containing wastewater treatment, and specifically provides a method for treating iodine-containing wastewater, which comprises the following steps: mixing a metal-doped bismuth tungstate material for treating iodine-containing wastewater with a binder and a conductive agent to prepare a slurry, coating the slurry on a conductive substrate, and drying to obtain a membrane electrode, and using the obtained membrane electrode to treat iodine-containing wastewater; and a preparation method of the metal-doped bismuth tungstate material for treating iodine-containing wastewater, which comprises the following steps: 1) dissolving bismuth salt and iron salt in a solvent to prepare a mixed solution; 2) adding a tungstate solution to the mixed solution to form a suspension, and then performing a hydrothermal reaction, collecting the precipitate after cooling, and washing and drying to obtain the product. The metal-doped bismuth tungstate material prepared by the application has the advantages of high specific surface area and good photo-assisted electric adsorption performance.

This invention relates to the field of nanoscale full-spectrum photocatalytic materials, and particularly to a method for preparing a molybdenum selenide / oxygen-deficient bismuth oxybromine@gold three-phase Z-type heterojunction photocatalyst. This method solves the problems of low photogenerated electron-hole separation efficiency, narrow full-spectrum response range, and poor stability in existing bismuth-based photocatalysts. The preparation method involves first preparing oxygen-deficient BiOBr nanospheres via a solvothermal method, then directly reacting tetrachloroauric acid with oleylamine in toluene to prepare small-particle-size monodisperse Au nanoparticles, which are then combined with oxygen-deficient BiOBr to prepare a BiOBr@Au nanosphere core-shell structure. Finally, a MoSe2 / oxygen-deficient BiOBr@Au three-phase composite material is prepared via a hydrothermal reaction. The catalyst of this invention exhibits absorption capacity under the full spectrum of light, and simultaneously achieves a synergistic enhancement of carrier separation efficiency and strong redox capability, demonstrating excellent photocatalytic activity and the ability to efficiently degrade pollutants and produce hydrogen.

A solid electrolyte with a doped modified layer and its preparation method and solid-state battery application, which relates to the field of new energy materials. It includes: a base material and a doped modified layer; the general formula of the base material is Li 7‑M PS 6‑M X M , X=Cl, Br, I, 1≤M≤1.6; the doping modification layer contains at least one element of Al, Mg, Fe, Zn, Sn, Ag, Cu, Se, Bi, Si, Mo; the interplanar spacing of the solid electrolyte (111) crystal plane is d(111), 0.54nm

This invention relates to the field of lithium battery technology, and in particular to a method for preparing a lithium-ion battery cell. The invention discloses a method for preparing a lithium-ion battery cell, comprising: first, preparing a positive electrode slurry containing modified titanium aluminum carbide, graphene oxide, etc., and a negative electrode slurry containing aminated carbon nanotubes, zinc aluminum spinel, etc., both processed according to specific proportions and processes; second, coating the positive and negative electrode slurries separately onto a current collector, and obtaining positive and negative electrode sheets through drying, coating with a coating agent, etc.; next, preparing a composite separator coated with a separator coating agent and curing it; finally, winding the separator in a positive-separator-negative-separator sequence, and obtaining a lithium-ion battery cell through drying, encapsulation, electrolyte injection, formation, etc.

The invention discloses an electrodeionization separation and purification method applied to a bio-based product desalination process, and belongs to the technical field of biochemical engineering separation. According to the electrodeionization separation and purification method applied to the desalination process of the bio-based product, the advantages of electrodialysis and resin desalination are fused, the resistance between the electrode plates is effectively reduced through the built-in medium containing the ionic groups, then the desalination efficiency driven by current is enhanced, and the production cost is reduced. According to the method, an electrodeionization device is utilized, efficient desalination treatment is carried out on various bio-based products such as saccharides and derivatives thereof, organic acid and organic alcohol, the desalination efficiency generally exceeds 98%, and the unit yield is kept to be 95% or above. In addition, under the configuration of a product flow conveyed across the membrane and a specific membrane group, the technology also shows excellent decolorization performance. The method disclosed by the invention shows wide applicability in desalting treatment of bio-based products, which indicates that the method has a wide development prospect in industrial application.

A high-capacity, dense anode material and its preparation method are disclosed. The preparation includes: mixing graphite micropowder with a first forming agent, such as asphalt, and a second additive, such as ammonium dihydrogen carbonate, to form a mixture; pressing the mixture into a blank; heat-treating the blank under a protective atmosphere to form a sinter; pulverizing the sinter into powder; mixing the powder with a third coating agent, such as phenolic resin, to form a homogenized material; and carbonizing the homogenized material to form, for example, a lithium-ion battery anode material. The anode material prepared by this invention can effectively shorten the migration distance during lithium-ion diffusion, greatly improve the rate performance of the material, effectively reduce defects on the surface and in the bulk of the graphite anode, ensure the formation of a smooth and stable specific surface area, further ensure the stable formation of the SEI film and structural stability during cycling, and effectively guarantee the material's high initial efficiency, high capacity, and long cycle performance.

The present application belongs to the technical field of electrolytic synthesis of non-ferrous metals and alloys, and discloses a method for preparing ferrotitanium alloy by electrolyzing ilmenite or high-titanium slag in a boron-containing molten oxide system. A titanium raw material is mixed into a B2O3-CaO-CaF2-SiO2 system after dehydration to form a melt; the melt is placed in a crucible and put into a sealed reactor; a cathode and an anode are put in, and a certain distance is kept between the two, and inert gas protection is provided; the temperature is raised to the working temperature, and electrolysis is carried out for a certain time; the product is taken out after cooling, washed with dilute acid and distilled water, and dried. The addition of B2O3 to the CaO-CaF2-SiO2 system for high-temperature molten oxide electrolysis can accelerate the dissolution of TiO2 in ilmenite and high-titanium slag, reduce the melting point of the molten salt, increase the migration rate of titanium ions, reduce the melt viscosity, and significantly improve the dissolution efficiency of TiO2 and the efficiency of electrolytic titanium.

The invention relates to a full-carboxyl biomass gel electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing Tempo oxidized nano-cellulose dispersion liquid with sodium alginate, pouring the mixture into a mold, immersing the mold into a divalent zinc salt solution, and standing to obtain the nano-cellulose / sodium alginate gel electrolyte. According to the invention, Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate are mixed, and the gel electrolyte with a dual-network structure is constructed through hydrogen-bond interaction between the Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate and rapid metal coordination between sodium alginate and zinc ions and is used for the zinc ion battery. The stable three-dimensional network structure and rich polar carboxyl functional groups of the gel electrolyte can accelerate the transmission rate of zinc ions and adjust interface zinc ion deposition, so that the effects of inhibiting zinc dendrites and reducing interface side reactions are achieved. The method is simple, the raw materials are easy to obtain, the repetition rate is high, and the prepared gel electrolyte has high ionic conductivity and good mechanical performance.

The invention belongs to the technical field of battery negative electrode material recovery, and particularly relates to a method for preparing a lithium battery negative electrode material through microwave-assisted recovery of modified waste graphite and the prepared modified graphite lithium battery negative electrode material. Aiming at the problems of poor electrolyte compatibility, poor cycling stability and the like of a graphite material, asphalt is adopted as a carbon source, recycled graphite is subjected to coating modification, and then a segmented heating solid-phase pyrolysis process is performed to prepare the graphite-based composite material with the core-shell-like structure. The waste graphite recycling, modifying and regenerating process disclosed by the invention has the characteristics of simplicity, high efficiency and environmental protection, the recycled graphite can be directly used as a lithium battery negative electrode material after being regenerated and modified, and the waste graphite recycling, modifying and regenerating process has the advantages of low cost, high reversible specific capacity and good cycle performance; and a new technical route is provided for preparation of a high-performance and low-cost lithium ion battery negative electrode material.

The application provides a battery electrolyte, comprising an additive component, the additive component comprising a nitrogen-containing heteroatom bridged ring structure, fluorine-containing acid root ions and / or fluorine-containing imine negative ions. The application modifies the electrolyte by selecting a specific additive component to form a stable and firm CEI film on the positive electrode surface to protect the electrode structure, and introduces fluorinated anions to enhance the association of anions and electrolyte solvent molecules, so as to improve the oxidation stability of the electrolyte. The modified electrolyte can be used to solve the instability of high-nickel ternary materials during the cycle process and the problem that the traditional electrolyte is prone to oxidative decomposition at high voltage, so as to improve the cycle life and rate performance of the ternary lithium battery at high voltage. The application is helpful to improve the oxidation stability of the electrolyte, reduce the charge transfer impedance and interface impedance, improve the ion diffusion rate, and enhance the stability of the electrode material structure.

The application belongs to the field of energy materials and photocatalytic hydrogen production, and provides a preparation method and application of a trivalent rhodium-doped titanium dioxide photocatalyst. The method comprises the following steps: (1) immerging rutile titanium dioxide powder in a rhodium salt solution, ultrasonic dispersion, stirring in a 50-90 DEG C water bath until uniform, continuing to stir until the solvent is evaporated, and obtaining a precursor powder; (2) placing the precursor powder obtained in step (1) in a quartz tube, and performing calcination under an air atmosphere rich in water vapor, and obtaining the trivalent rhodium-doped titanium dioxide photocatalyst. The preparation process is simple, the generation of quadrivalent rhodium ions which are not conducive to photocatalytic hydrogen production reaction can be inhibited, and the trivalent rhodium-doped titanium dioxide photocatalyst is obtained. The visible light photocatalytic hydrogen production activity of the obtained rhodium-doped titanium dioxide photocatalyst is much higher than that of a photocatalyst synthesized by a traditional solid phase method, and the rhodium-doped titanium dioxide photocatalyst has good stability.

The invention discloses a high-conjugation biomass carbon quantum dot and a preparation method and application thereof.The method comprises the steps that a biomass material is subjected to pre-irradiation treatment with the electron irradiation dose being 900-3600 kGy, water is adopted to prepare an aqueous solution, and then a hydrothermal reaction is conducted; and after the reaction is finished, cooling, centrifuging, removing large particles, dialyzing the supernate by using a 1000Da dialysis bag, collecting the solution in the dialysis bag, and freeze-drying to obtain the high-conjugation biomass carbon quantum dots. The high-conjugation biomass carbon quantum dot disclosed by the invention can remarkably improve the electron migration rate and the free radical scavenging capacity, so that the redox balance in a plant body is more efficiently maintained. The carbon quantum dots can improve the photosynthesis level, the membrane lipid stability and the cell antioxidant system activity of plants in a saline-alkali environment in a foliage spraying manner on the premise of not changing the plant gene background, and show excellent environmental adaptability and physiological regulation ability.

The invention provides an electrochemical device and electronic equipment, the electrochemical device comprises a positive electrode, a negative electrode and a diaphragm, the diaphragm comprises a base film and a coating layer, the coating layer comprises a first coating layer and / or a second coating layer, the coating surface density of the first coating layer is a g / m < 2 > / mu m, the coating surface density of the second coating layer is b g / m < 2 > / mu m, an electrolyte contains a fluorosulfonamide compound, and the electrolyte contains an electrolyte. The mass content of the fluorosulfonamide compound in the electrolyte is c%, and the binding power efficiency of the electrolyte is M; the following relational expression is satisfied: M = 25% * a + 75% * b; c / M is greater than or equal to 2.67 and less than or equal to 49.52; through the synergistic effect of the coating layers on the two sides of the diaphragm, the cycling stability, the rate capability and the safety of the battery are improved, meanwhile, the lithium dendrite penetration risk is effectively inhibited, and good dimensional stability is kept under the high-temperature condition; by synergistically limiting the coating surface density of the first coating layer and the second coating layer and the mass content of the fluorosulfonamide compound, the cycling stability, the interface compatibility and the high-temperature storage performance of the lithium ion battery can be remarkably improved.

The invention belongs to the technical field of semiconductors, and discloses a composite coating for a semiconductor device and a preparation method thereof.The preparation method comprises the following preparation steps that organic resin and a carburant are added into an alcohol solvent to be evenly mixed, and a resin solution is obtained; the method comprises the following steps: adding a tantalum source and a phase forming accelerant into an alcohol solvent, stirring and mixing to obtain a tantalum solution; the surface of the base body is coated with a resin solution and a tantalum solution, heating curing, carbonization and cooling are carried out, a composite coating containing glassy carbon and tantalum carbide is obtained, and the composite coating is of a single-layer structure or a double-layer structure; the single-layer structure is a composite single-layer coating containing glassy carbon and tantalum carbide; the double-layer structure is a double-layer coating structure comprising a glassy carbon layer and a glassy carbon and tantalum carbide composite layer from bottom to top from one side of the surface of the base body. The density of the composite coating prepared by the method can be effectively improved, so that the corrosion resistance of the composite coating in a plasma environment is improved.

The invention provides carbonized aggregate, a carbonized product with high carbonization depth and a preparation method of the carbonized aggregate, and belongs to the technical field of carbon sequestration building materials.The preparation method comprises the following steps that solid waste raw materials, cement, silica fume, a thickening agent, a water reducing agent and water are evenly mixed and subjected to pouring forming, and a green body is obtained; and drying the green body until the water content is 13-20%, and carbonizing and curing to obtain the high-connectivity artificial carbonized aggregate. And stacking a plurality of high-connectivity artificial carbonized aggregates in a mold in advance, pouring the slurry into the mold, maintaining at 25 DEG C for 24 hours, demolding, carrying out microwave pretreatment, and then carrying out carbonization maintenance to obtain the carbonized product. According to the method for constructing the continuous carbon dioxide transportation network by using the high-connectivity artificial carbonized aggregate and the preset aggregate technology, the light high-strength carbonized product with the high carbonization depth is prepared, the compressive strength can reach 39.23 MPa after the carbonized product is carbonized for 1 day, the density is 1711 kg / m < 3 >, the carbonization degree is 43.27%, the carbonization uniformity depth is 50 mm, the carbon fixation amount is 356.2 kg / m < 3 >, and the pre-curing time is 4 h.

The application relates to the technical field of batteries, and provides an electrochemical device, which comprises a positive electrode sheet, a negative electrode sheet and a separator, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer located on at least one side surface of the negative electrode current collector, the negative electrode active layer comprises a negative electrode active material, the negative electrode active material comprises a silicon-based material; the separator comprises a base film and a ceramic layer arranged on at least one side surface of the base film, the ceramic layer comprises a plurality of interval distributed stripes and a plurality of interval areas located in the middle of adjacent stripes, the width of the stripe is A1 mu.m, and the width of the interval area is A2 mu.m; the electrochemical device satisfies the relationship formula 0.06 <= A * C <= 0.9, wherein A is A1 / A2, and C is the mass content of silicon elements in the negative electrode active material. The scheme effectively alleviates the volume expansion of the silicon negative electrode, improves the charging and discharging efficiency, reduces the minimum residual power level capable of effective discharging, and improves the available discharge depth.

The invention provides a polyanionic precursor and a preparation method thereof, a sodium ion battery positive electrode material and a sodium ion battery. The polyanionic precursor comprises a sodium element, an iron element and a phosphorus element; wherein the total amount of substance of the iron element is NFe, the total amount of substance of the phosphorus element is NP, and the ratio of the total amount of substance of the iron element NFe to the total amount of substance of the phosphorus element NP is larger than or equal to 0.8 and smaller than or equal to 0.9. The polyanionic precursor disclosed by the invention has a relatively high iron-phosphorus ratio, is beneficial to exerting the battery capacity, and meanwhile, improves the rate capability of the battery, so that the battery can still keep stable electrochemical performance in a high-rate charge-discharge scene.

The invention discloses a collagen-based dura mater containing a specific microporous layer and a preparation method thereof. The collagen-based dura mater containing the specific microporous layer comprises a first collagen mater layer, a second collagen mater layer and a third collagen mater layer, wherein the first collagen mater layer is suitable for facing the skull side and at least comprises mineralized collagen materials; the first collagen membrane layer is suitable for facing the brain tissue side and at least comprises a second collagen membrane layer compounded by collagen and other materials; the microporous layer is located between the first collagen membrane layer and the second collagen membrane layer and at least comprises collagen, and the range of the pore diameter and the porosity of the microporous layer meets the requirements that the microporous layer is suitable for supporting growth and migration of meningeal cells, is also suitable for preventing leakage of cerebrospinal fluid and invasion of fibroblasts, and is also suitable for ensuring a continuous phase of mechanical support; the pore diameter of the microporous layer is 5-20 [mu] m, the porosity is 60-80%, and the thickness is 20-120 [mu] m. According to the technical scheme, a three-layer composite bionic structure is constructed by introducing the microporous layer with specific pore diameter and porosity between the two collagen membrane layers, so that cross-scale collaborative optimization of mechanical support, biological activity and anti-leakage performance of the dura mater repair material is realized.