58results about How to "Reduced Diffusion Resistance" patented technology

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a lithium ion battery positive electrode material, a preparation method thereof and a lithium ion battery. The lithium ion battery positive electrode material comprises a lithium-rich manganese-based positive electrode material and F-doped ferric cobaltate coating at least part of the surface of the lithium-rich manganese-based positive electrode material, the chemical formula of the F-doped ferric cobaltate is FeCo2O4-0. 5xFx, and x is larger than or equal to 0.01 and smaller than or equal to 0.06. According to the lithium ion battery positive electrode material, the lithium-rich manganese-based positive electrode material is coated with FeCo2O4-0. 5xFx, the structural stability of the lithium-rich manganese-based positive electrode material can be effectively improved, the FeCo2O4-0. 5xFx coating layer has a high Fermi level and excellent conductivity, and the ionic conductivity of the lithium-rich manganese-based material can be effectively improved.

The invention provides a positive pole piece, a preparation method thereof and a battery, and aims to solve the technical problems that the capacity of LMFP is difficult to effectively exert and the cycle life of the battery is poor. The positive pole piece comprises a current collector and a first active material layer and a second active material layer which are arranged on the current collector, and the first active material layer and the second active material layer are sequentially distributed in the direction away from the current collector; the first active material layer and the second active material layer both contain lithium manganese iron phosphate; the first active material layer further comprises a first conductive agent and a first lithium supplement agent, and the second active material layer further comprises a second conductive agent and a second lithium supplement agent; wherein the gram volume K1 of the first lithium supplement agent is greater than the gram volume K2 of the second lithium supplement agent; the mass percentage D1 of the first conductive agent in the first active material layer is greater than the mass percentage D2 of the second conductive agent in the second active material layer.

The invention provides pseudo-boehmite, a preparation method thereof and a gamma-alumina carrier with high diffusion mass transfer performance. The preparation method comprises the following steps: respectively preheating an aluminum-containing acidic solution, a sodium metaaluminate solution and reaction bottom water to gel forming reaction temperature; under stirring, dropwise adding the first part of the aluminum-containing acidic solution and the first part of the sodium metaaluminate solution into the reaction bottom water, controlling the pH value of the gelling reaction to be 5.0-8.5, and uniformly mixing to obtain material slurry; dropwise adding all the residual aluminum-containing acidic solution and the residual sodium metaaluminate solution into the material slurry, and carrying out gel forming reaction to obtain reaction slurry; and carrying out step-by-step variable-temperature aging on the reaction slurry, and carrying out suction filtration, washing and drying to obtain the pseudo-boehmite. According to the method, the problem of poor pore regulation flexibility in a traditional double-aluminum method is solved, the limitation of the pore size can be overcome, and the pore permeability of the gamma-alumina carrier is improved, so that the diffusion mass transfer performance of the gamma-alumina carrier is greatly enhanced.

The invention discloses a short b-axis ZSM-5 molecular sieve as well as a synthesis method and application thereof, tetraethyl orthosilicate and aluminum isopropoxide are taken as an aluminum source, tetrapropylammonium hydroxide is taken as a template agent, ammonium salt is added as an auxiliary agent to limit the growth of particles along a b axis, after a hydrothermal crystallization reaction, the obtained product is washed, baked and calcined, and the short b-axis ZSM-5 molecular sieve is obtained. The method disclosed by the invention is simple to operate, has repeatability, small template agent dosage and low cost, the synthesized ZSM-5 molecular sieve has the advantages of good thermal stability, high specific surface area, strong acid center, slow carbon deposition speed in reaction and the like, meanwhile, more active sites can be exposed, the transmission path of reactants and products is shortened, the diffusion resistance is reduced, and the method is suitable for industrial production. The catalyst is used for catalytic synthesis of pyridine and derivatives thereof, and has high selectivity and high catalytic activity.

The invention discloses a preparation method of a metal oxide coated high-nickel ternary positive electrode material, which comprises the following steps of: dissolving a solution containing coated metal in an organic solvent under a stirring condition to obtain a solution containing metal oxide; adding the high-nickel ternary material powder into an organic solvent under ultrasonic operation to obtain a solution of the high-nickel ternary positive electrode material powder; dropwise adding the solution containing the metal oxide into the solution of the high-nickel ternary positive electrode material powder under ultrasonic operation to obtain a mixed solution; heating the mixed solution under a magnetic stirring condition to volatilize the solvent, collecting the material, and drying in a vacuum drying oven; and calcining the dried material in pure oxygen to obtain the metal oxide coated high-nickel ternary positive electrode material. The electrochemical performance of the high-nickel ternary positive electrode material at low temperature can be effectively improved, specifically, the surface of the positive electrode is regulated and controlled, the contact area of the surface of the ternary positive electrode material and electrolyte at low temperature is reduced, so that side reaction is reduced, and meanwhile, the coating layer with certain mechanical strength can be formed in the long-term cycle process at low temperature, so that the electrochemical performance of the high-nickel ternary positive electrode material is improved. Positive electrode breakage is effectively reduced, and the cycling stability of the high-nickel ternary positive electrode at low temperature is effectively improved.

The invention provides carbon aerogel for wastewater purification and hydrogen production through water photolysis and a preparation method of the carbon aerogel, Au / Cu-MOF / SA carbon aerogel serves as a photothermal evaporation module to be used for interface photothermal wastewater purification driven by solar energy, and ZnIn2S4 / Au / Cu-MOF / SA carbon aerogel serves as a photocatalytic reaction module to be used for photocatalytic hydrolysis hydrogen production. By designing the composite carbon aerogel, solar energy is positioned on a gas-liquid interface for evaporation of wastewater; and then the purified distilled water is used as a raw material for hydrogen production through photocatalytic hydrolysis, so that integration of wastewater purification and hydrogen production through water photolysis is realized. The upper photo-thermal layer and the photocatalytic layer are exposed on the water surface due to the self-floating characteristic of the system, so that efficient light transmission can be realized, light attenuation caused by water can be reduced to the greatest extent, and the problem that a traditional powder photocatalyst is difficult to recycle can be effectively solved; hydrogen can be stably generated for a long time in waste water containing various pollutants, and great commercial application potential is achieved.

The invention belongs to the technical field of catalysts and application thereof, and particularly relates to a preparation method and application of a framework nickel-doped TS-1 type molecular sieve catalyst. According to the method, TS-1 titanium silicalite molecular sieve raw powder prepared from cheap raw materials is adopted as an initial raw material, nickel cations are introduced into a TS-1 molecular sieve framework in a mode of combining nickel ion coordination complexation with tetrapropylammonium hydroxide hydrothermal treatment, and a hollow cavity is formed in a molecular sieve crystal. The protective effect of the complexing agent on nickel ions effectively prevents the nickel ions from forming metal nickel particles in the hydrothermal treatment process; the tetrapropylammonium hydroxide promotes the TS-1 titanium silicalite molecular sieve to be dissolved and recrystallized to form closed or open mesopores, and nickel ions are embedded into a molecular sieve framework. In the prepared nickel-doped TS-1 titanium silicalite molecular sieve, nickel exists in the form of positive ions and partially replaces titanium ions in a framework, so that the charge density around the titanium ions is remarkably reduced, and the surface acidity is weakened.

The problem to be solved by the present invention is to provide: an electrode for a secondary battery having an active material layer in which a material such as an active material and a conductive auxiliary agent is uniformly dispersed and in which the diffusion resistance of ions is low; and a secondary battery having a high operating voltage at a high current density. In order to solve the problem, this electrode for a secondary battery has a current collector and an active material layer disposed on at least one surface of the current collector, the active material layer containing an active material and a conductive auxiliary agent, and the conductive auxiliary agent is formed from an image of a cross-section. The average value of the area of the Voronoi region obtained by Voronoi analysis using the conductive auxiliary agent as the base point is in the range of 1.00 [mu] m2 or more and 2.50 [mu] m2 or less, and the standard deviation of the area of the Voronoi region is 0.20 or less.

The present invention relates to the technical field of preparation of lithium ion battery electrode materials, and specifically to an aluminum-niobium co-doped lithium-rich layered positive electrode material and a preparation method thereof. The steps include: preparation of a cationic colloidal solution; preparation of a derivative carbon precursor solution; coating and sintering of a positive electrode powder material. The present invention uses an electrostatic spinning machine to directly spray the spinning solution into an alkaline solution, and simultaneously adds solution B. At the moment when the spinning solution is electrostatically spun into the alkaline solution, a precipitate is generated on the surface of the nanofiber and is quickly fixed, and a precipitation reaction also occurs inside the fiber through a diffusion mechanism. The generated precursor is not only orderly arranged, but also has a porous structure, which improves the rate performance of the electrode material, and can also form an interlocking structure between the fibers. The added lithium ion solution is deposited on the fiber surface, which can effectively improve the mechanical strength and conductivity of the positive electrode material, so that the material maintains stability during long-cycle use and reduces capacity attenuation.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

The invention discloses a method for synthesizing mesalazine and application of mesalazine. The method comprises the following steps: introducing p-nitrophenol, formic acid and a Cu-Co-coated MFI-NS molecular sieve catalyst into a continuous flow reaction zone, and sequentially carrying out electrophilic substitution and nitro hydrogenation cascade reaction at normal pressure and 50-70 DEG C; the catalyst has a micropore-mesopore stepped pore channel, and contains a Cu0 metal cluster and a framework Co < 2 + > acid site. And separating, acidifying and crystallizing the reaction liquid to obtain a finished product. According to the invention, the shape-selective selectivity and difunctional synergistic effect of the molecular sieve are utilized, high conversion rate (gt, 98%) and high selectivity (gt, 94%) under mild conditions are realized, the product purity is greater than or equal to 99.5%, and the Cu / Co residue meets the ICHQ3D standard. The catalyst can be recycled for 10 times or more, the yield is reduced by 5% or less, iron mud pollution of a traditional iron powder method and the metal leaching risk of a noble metal catalyst are thoroughly eliminated, and the method has the remarkable advantages of being environmentally friendly, efficient, low in cost, easy to industrially amplify and the like and is suitable for preparing the medicine for treating the inflammatory bowel disease.

The invention belongs to the technical field of energy conservation and environmental protection, and discloses a preparation method of a porous gas diffusion film, which comprises the following steps: preparing raw materials, uniformly mixing the raw materials, a diluting solvent, a nonionic surfactant and fused salt, and melting to form a precursor solution; the precursor solution is melt-blown through a hot air driving spinning nozzle to form silk fibers, the silk fibers are transversely distributed to form fiber layers by controlling the spinning nozzle to transversely move relative to the spinning direction, a laminated structure formed by laminating at least two fiber layers is subjected to hot pressing to form a film, and a blank is obtained; and after the blank is cooled, molten salt is removed in a water washing mode, and then the blank is wound and cut into the proper size. The porous gas diffusion film prepared by the method has porous structures with different sizes, so that the gas diffusion resistance can be effectively reduced, and the gas can be quickly guided out along the microtube structure by virtue of the macropores; according to the method, the porosity, the aperture range and the roughness of the membrane can be adjusted, and the whole preparation method is relatively simple and low in cost.

An electrode mixture for batteries according to one embodiment contains a binder and an active material which is capable of absorbing and desorbing lithium ions. This electrode mixture additionally contains a layered silicate compound; and the content of the layered silicate compound is more than 0.1% by mass, and preferably less than 0.9% by mass relative to the mass of the active material. One example of the layered silicate compound is at least one kind of smectite. In addition, it is preferable that this electrode mixture additionally contains carbon nanotubes.

The present invention discloses a preparation method and application of a highly dispersed cobalt-modified nitrogen-sulfur co-doped hierarchical porous carbon composite material, belonging to the technical field of electrocatalytic materials. The preparation method comprises the following steps: sulfation-modifying chitosan to obtain positioned sulfonated chitosan; adding the positioned sulfonated chitosan to a Ca-containing 2+ and Co 2+ The method comprises the following steps: stirring the mixture evenly in a solution of 200 μm and 30 μm, aging the mixture to obtain a positioning chitosan sulfonate mixture; calcining the positioning chitosan sulfonate mixture under an inert atmosphere, and acid leaching the calcined product to obtain the highly dispersed cobalt-modified nitrogen-sulfur co-doped hierarchical porous carbon composite material. The highly dispersed cobalt-modified nitrogen-sulfur co-doped hierarchical porous carbon composite material provided by the present invention has a simple preparation process, good electrocatalytic activity and stability, and can be used as an electrocatalyst for secondary zinc-air batteries.

This invention relates to the field of freeze-drying technology, specifically to an intelligent vacuum freeze dryer and its usage method. The dryer includes a main unit and a pre-freezing vacuum chamber within it, a shelf placed inside the pre-freezing vacuum chamber, the shelf having an internal cavity and a main gas inlet at its bottom for gas to enter the internal cavity; a carrying tray with multiple evenly arranged internal components for storing materials, the tray having multiple planar grids and heating elements for releasing heat, multiple push rods for moving materials within the planar grids, and an adjustment component for adjusting the position of the push rods according to different usage environments; and side rotating columns with multiple evenly rotatable components connected to the sidewalls of the carrying tray, each side rotating column having multiple exhaust ports, and the carrying tray having an efficiency-enhancing component for driving the side rotating columns.

The embodiment of the invention provides a preparation method of a high-dispersion lamellar ZSM-5 molecular sieve, and relates to the field of molecular sieve preparation. S1, preparing a seed crystal solution; s2, mixing a tetrapropylammonium hydroxide solution, deionized water, a silicon source and the seed crystal solution prepared in the step S1 to obtain a solution B; s3, adding an aluminum source into the deionized water, and dissolving the aluminum source into the deionized water; s4, deionized water in which an aluminum source is dissolved is added into the clarified solution in the step S2 to be stirred, and a white solution C is obtained; s5, adding the additive into the deionized water, and enabling the additive to be dissolved in the deionized water; s6, adding deionized water in which an additive is dissolved into the solution C in the step S4, stirring, and then putting the solution into a crystallization kettle for crystallization to obtain a crystallized sample; and S7, carrying out drying treatment on the crystallized sample, and roasting to obtain the lamellar ZSM-5 molecular sieve.

The application discloses a process for synthesizing polyether ether ketone by using compounded porous sodium carbonate, and relates to the technical field of polyether ether ketone.The raw materials such as hydroquinone and a salting agent are premixed under the protection of nitrogen, solid-phase materials and molten diphenyl sulfone are introduced into a reaction kettle to complete salting and polymerization, pulse stirring is combined, temperature control is realized in stages by using an intermittent method or a continuous method, and the salting agent is special compounded porous sodium carbonate.The application can improve salting and polymerization efficiency, shorten the synthesis time, narrow the molecular weight distribution of the product, improve the mechanical properties of the polyether ether ketone, and is suitable for intermittent / continuous industrial production.

The invention discloses a method for preparing durene by utilizing unsym-trimethylbenzene and methanol, which comprises the following steps: mixing unsym-trimethylbenzene, methanol and hydrogen, heating and gasifying, feeding into a fixed bed reactor, and carrying out alkylation reaction through a molecular sieve catalyst with hierarchical pore distribution to prepare durene, after a reaction product flowing out of the alkylation reactor is subjected to gas-liquid separation and oil-water separation, liquid-phase hydrocarbon components enter a rectification separation system, and light hydrocarbon with the carbon number of C6 or below, methylbenzene, xylene, trimethylbenzene, tetramethylbenzene and aromatic hydrocarbon fractions with the carbon number of C11 or above are separated out. The mesoporous channel of the catalyst increases the contact probability of the raw material and the active site of the molecular sieve, promotes the playing of the activity of the catalyst in a fixed bed, reduces the diffusion resistance of the raw material and the product, promotes the rapid diffusion of the product, and reduces the occurrence of side reactions, so that the conversion rate of unsym-trimethylbenzene and the selectivity of durene are improved; therefore, high durene yield can be obtained.

This invention discloses a method for preparing an internally pressurized MOF-based hollow fiber composite membrane module, belonging to the field of membrane separation technology. The invention involves introducing an aqueous solution containing metal ions and an organic solution containing organic ligands into the shell side and tube side of a hollow fiber membrane module, respectively. By controlling the number of reactions between metal ions and organic ligands on the inner surface of the hollow fiber membrane, a continuous MOF functional layer is precisely constructed. Subsequently, a low-concentration polymer solution is used to repair defects in the MOF layer, resulting in an internally pressurized MOF-based hollow fiber composite membrane module, which is then applied to pervaporation ethanol / water separation. This method simplifies the preparation process of the internally pressurized hollow fiber composite membrane module; the thin inner surface MOF layer reduces molecular diffusion resistance and enhances molecular mass transfer; the surface-coated polymer matrix effectively repairs MOF layer defects, further enhancing molecular separation selectivity and effectively protecting the MOF functional layer; and it enhances the long-term stability of the membrane module.

The application relates to a preparation method and a phased application method of an aging SBS modified asphalt regenerant with diffusion and enhancement, and belongs to the technical field of road engineering materials and waste asphalt regeneration. A first agent and a second agent are used in stages, the first agent comprises naphthenic base oil and / or aromatic base regenerative oil, epoxy vegetable oil and / or fatty acid ester, a surface active diffusion promoter, a small molecule compatibilizer and an antioxidant, the second agent comprises maleic anhydride grafted SBS and / or maleic anhydride grafted SEBS, liquid rubber and / or hydroxyl-terminated polybutadiene, an epoxy reactive compatibilizer, tackifying resin, a non-amine type interface stabilizing aid and a complexing aid of a hindered amine light stabilizer and an ultraviolet absorber. The application can solve the problems that softening and enhancement of a traditional single-dose regenerant are difficult to be considered, the two-component synchronous adding mode is insufficient in stage control, aging SBS modified asphalt diffusion softening is insufficient, SBS elastic network repair is uneven and the durability after regeneration is insufficient.

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

The invention discloses a catalyst for improving an octane number in light naphtha isomerization and a preparation method of the catalyst. The catalyst comprises 40-70wt% of a carrier, 5-15wt% of a dispersing agent, 15-25wt% of a pore forming agent and 8-20wt% of transition metal, wherein the transition metal is based on the oxide thereof. The two active centers of the ZSM-5-5at-ZrO2 composite molecular sieve catalyst cooperate to catalyze cracking and alkylation, and due to the mesopores of the shell, the diffusion resistance is reduced, and the diffusion of reactants and products is accelerated, so that the ZSM-5-5at-ZrO2 composite molecular sieve catalyst has the characteristics of good accessibility of the catalytic active centers, high catalytic activity, good stability and the like.

The invention discloses an ozone catalytic membrane and aeration biological membrane synergistic reaction device which comprises an ozone preparation unit, the ozone preparation unit comprises an oxygen generator and an ozone generator connected with the oxygen generator, and the ozone preparation unit comprises an ozone catalytic membrane reactor and an aeration biological membrane reactor. The reaction process is as follows: a target water body and ozone enter the ozone catalytic membrane reactor, and then enter the aeration bio-membrane reactor for reaction after reaction. According to the invention, bubble-free aeration is carried out by using the ozone catalytic membrane contactor, so that the operation cost required for preparing an ozone source can be utilized to the maximum extent.

The invention discloses hollow Silicalite-1 zeolite with controllable mesopores as well as a preparation method and application of the hollow Silicalite-1 zeolite, and the obtained Silicalite-1 zeolite is composed of a mesoporous shell with adjustable pore diameter and a hollow inner cavity. The Silicalite-1 zeolite is provided with a hollow cavity, sufficient space is provided for amine loading, a shell layer is provided with a mesoporous structure with the pore diameter adjustable in the range of 2-20 nm, and amine molecule dispersion and CO2 diffusion efficiency are both considered. The invention further provides a solid amine CO2 adsorbent, high-capacity loading and good dispersity of amine and efficient diffusion of CO2 are synchronously achieved through a composite structure of a hollow cavity and a controllable mesoporous shell layer of a zeolite carrier, and the tradeoff limitation of a traditional carrier between mass transfer and loading is broken through. The adsorbent can be used for capturing CO2 in medium and low temperature flue gas. According to the invention, the problems of poor amine dispersibility, large CO2 diffusion resistance, low adsorption capacity, easy inactivation and the like caused by narrow pore channels of the zeolite carrier of the existing solid amine adsorbent are solved.

The utility model discloses a naphtha dechlorination device, which relates to the technical field of dechlorination equipment and comprises a tank body, a mounting shell is mounted at the top end of the tank body, a rotating component is mounted in the mounting shell and comprises a rotating motor mounted in the mounting shell, and the output end of the rotating motor is connected with a first bevel gear. One side of the top end of the first bevel gear is in meshed connection with a second bevel gear, the middle of the second bevel gear is fixedly connected with a first rotating rod, one side of the bottom end of the first bevel gear is in meshed connection with a third bevel gear, the first rotating rod is arranged on the inner wall of the third bevel gear in a sleeving mode and is rotationally connected, and a fixing support is installed on the inner wall of the tank body; according to the utility model, the inner stirring blade and the outer stirring blade respectively rotate in opposite directions by utilizing the rotating assembly to form a complex three-dimensional flow field, and when the inner-layer stirring blade rotates in the forward direction, materials in a central area are driven to quickly circulate, so that a dechlorinating agent is quickly dispersed into a naphtha main body.

This invention discloses a method for preparing a catalyst for hydrodenitrification and decarbonization of heavy oil, comprising the following steps: (1) mixing boehmite powder, boron-containing micron-sized spherical activated carbon, and water into a slurry, then separating the solid and liquid phases, drying the solid phase material, then kneading, molding, drying, and calcining under an inert atmosphere to obtain an alumina support precursor, and then loading boron to obtain a boron-modified alumina support precursor; (2) adding the boron-modified alumina support precursor and propylene oxide aqueous solution into a closed high-pressure reactor, reacting at 60-100℃ for 1-4 hours, then raising the temperature to 110-180℃ for 2-6 hours, drying, and calcining to obtain an alumina support, and then loading hydrogenation active components to obtain the catalyst product. The catalyst prepared by this method has a worm-like particle morphology on its surface, and the pores formed by the accumulation of worm-like particles are open. The catalyst also has suitable Brønsted acid and Lewis acid content. This catalyst is suitable for hydrodenitrification and decarbonization reactions of inferior heavy oil.

The invention provides a preparation method and application of a lithium iron titanate / carbon quantum dot composite material, and belongs to the technical field of electrochemical energy storage. The preparation method comprises the following steps: uniformly mixing anatase and sodium hydroxide, and carrying out ultrasonic treatment and hydrothermal activation; repeatedly centrifuging the activated product sodium titanate and adding deionized water until the supernate is neutral, and drying to obtain a pickling product; the acid pickling product is ground, sieved and calcined to obtain bronze phase TiO2 (B); the preparation method comprises the following steps: by taking citric acid as a chelating agent, dissolving CH3COOLi. 2H2O, FeCl2. 4H2O, TiO2 (B) and carbon quantum dots in absolute ethyl alcohol, carrying out water bath stirring to obtain gel, carrying out vacuum drying and sieving, and calcining in an inert atmosphere to obtain a pre-sintered material; and sequentially carrying out ball milling and sieving on the pre-sintered material, and carrying out final sintering in an inert atmosphere to obtain the Li2FeTiO4 / carbon quantum dot composite material. The carbon quantum dots and the lithium iron titanate are compounded to form the lithium ion battery positive electrode composite material with enhanced electrochemical performance, and the preparation process is simple, low in cost and suitable for large-scale commercial production.

This invention relates to a negative electrode for a secondary battery and a secondary battery including the same. The negative electrode for the secondary battery comprises: a current collector; and a negative electrode active material layer formed on the current collector, containing a negative electrode active material, satisfying the following relation 1: [Relation 1] D < 1.9·10 ‑3 In Equation 1, D is the diffusion coefficient of lithium ions within the negative electrode, derived mathematically as follows: D = σ 2 ·τ d ‑γ σ is the thickness (cm) of the negative electrode active material layer, and τ d Here, γ is the diffusion time (s), and γ is the dispersion parameter, satisfying 0.8 ≤ γ ≤ 0.95. The electrode of this invention forms fine and dense pores, thereby reducing diffusion resistance within the electrode and thus enabling a battery with high output performance.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

This invention discloses a reinforced separator material for power batteries and its preparation method, belonging to the field of separator material technology. By acid-activating and hydrothermally coating boehmite powder, polydopamine-coated powder is obtained, improving the thermal stability of the powder and the strong bonding force between subsequent slurry components. Then, through ion exchange, zinc-intercalated montmorillonite is obtained, expanding the interlayer spacing to facilitate efficient lithium-ion transport and reduce battery internal resistance. Next, through polar gradient dispersion and high-pressure homogenization, the two are mixed with other components to obtain a premixed slurry. Polyether-modified silicone oil is added to the premixed slurry to obtain a mixed slurry. The mixed slurry is then coated on both sides of a pretreated PE separator and cured in stages to obtain a reinforced separator material for power batteries. This achieves strong interfacial bonding, high mechanical strength, and high thermal stability in the separator material.