48results about How to "Does not affect diffusion" patented technology

The invention provides a preparation method of a graphene quantum dot/nanometer silicon negative electrode material for a lithium-ion battery. Amino acid functional graphene quantum dots are prepared by high-temperature pyrolysis of a mixture of a citric acid and an amino acid as a carbon source; and then a graphene quantum dot/nanometer silicon compound is obtained by coating the graphene quantum dots on the surface of nanometer silicon particles. A research shows that the electron/ion conductivity of a silicon negative electrode is improved by introduction of the graphene quantum dots; and the compound has significantly improved specific capacitance and high rate capability and cycling stability as the negative electrode material for the lithium-ion battery. The preparation method can be widely applied to various high-capacity lithium-ion batteries.

The invention relates to a preparation method of composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber. The composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber prepared by the method of the invention has strong bonding force between the active component of the titanium silicate molecular sieve and the nano-carbon fiber. Comparing with the industrial micro-nano TS-1 powder (100-500nm), the filtering quality is significantly improved. In the course of using the TS-1 catalyst, the problem of the solution dispersion and separation can be solved; the method is simple and the application range is wide. The catalytic performance of the made composite catalyst is excellent, and can be used for the cyclohexanone ammoximation, the conversion rate of the cyclohexanone and the cyclohexanone oxime selectivity can both reach over 98 percent.

The invention discloses a nanometer silicon-carbon composite material and a preparation process thereof, and an application of the nanometer silicon-carbon composite material as a negative electrode material in a lithium ion battery. The nano-silicon-carbon composite material has a multi-stage structure, wherein the nano-silicon particles are taken as a core, the amorphous carbon is taken as an intermediate cladding layer, and the carbon fluoride is taken as a shell. The above preparation proces, Nano-silicon was prepared by simple alloying and de-alloying of low-cost crude silicon and magnesium powder. In the process of de-alloying, magnesium silicide and polymer pyrolysis were used simultaneously, and nano-silicon-carbon and carbon fluoride were combined by physical ball milling to prepare nano-silicon-carbon composite. The SiC nanocomposites prepared by the above method have high capacity, high first Coulomb efficiency and excellent cycle performance. The method has the advantages of simple process, low energy consumption, and is favorable for industrial production.

The invention provides a ternary positive electrode active material of a lithium ion battery and a preparation method thereof, a positive electrode material, a lithium ion battery and a product thereof, which relate to the technical field of ternary materials. The ternary cathode active material of a lithium ion battery comprises a nickel-cobalt-manganese cathode material, a nanometer tin dioxideand graphene oxide, wherein the nanometer tin dioxide is coated on the surface of the nickel-cobalt-manganese cathode material, and the nickel-cobalt-manganese cathode material coated with the nanometer tin dioxide on the surface is embedded in the graphene oxide laminated structure; the ternary cathode active material of the lithium ion battery alleviates the technical problems of poor rate performance and poor cycle performance of a traditional cathode active material. The invention also provides a preparation method of the abovementioned cathode active material, a cathode material, a lithium ion battery and a product thereof.

The invention discloses a surface-modified silicon-carbon composite and a preparing method and application thereof. The method includes the steps of firstly, conducting high-temperature treatment on commercial raw materials containing silicon oxide, and conducting pickling to clean away impurities to obtain silicon oxide; secondly, conducting magnesium thermal reduction reaction on the silicon oxide to obtain nanometer silicon, synchronously conducting carbon wrapping to obtain a silicon-carbon nanometer material, and combining the nanometer silicon carbon and fluoride through ball-milling toobtain the silicon-base composite. Compared with the prior art, the method is simple in process, low in energy consumption and beneficial for industrial production. The silicon-carbon composite modified by the prepared surface fluoride has high capacity, high primary coulombic efficiency and excellent circulating performance.

The invention discloses a modified ZSM-5 catalyst for alkylation reactions, a preparation method and applications thereof, and a p-xylene preparation method. The modified ZSM-5 catalyst comprises a ZSM-5 molecular sieve core and an all-silicon molecular sieve shell formed on the outer surface of the core, wherein the pore channels of the shell are communicated to the pore channels of the core so as not to cover the pore channels of the ZSM-5 molecular sieve core by the all-silicon molecular sieve shell, the all-silicon molecular sieve shell has shape-selective effects on alkylation reactions and does not have reaction activity, a molar ratio of Si to Al in the ZSM-5 molecular sieve core is 100-500:1, and the all-silicon molecular sieve shell is formed by reducing the concentrations of a silicon source and a template agent through epitaxial growth. According to the present invention, the catalyst can operate at a high toluene concentration and high space velocity to obtain the high yield of p-xylene, and is suitable for large-scale production and industrial scale application.

The invention discloses a nano silicon-based material, and a preparation method and an application thereof. The preparation method comprises the following steps: obtaining silicon sulfide through high-temperature solid-phase reaction of commercial raw silicon and powdered sulfur, obtaining nano silicon through metal thermal reduction reaction of silicon oxide, then, compositing the nano silicon with sulfide solid-state electrolyte through grinding, and obtaining the nano silicon-based material. Compared with the prior art, the nano silicon-based material has the advantages of low energy consumption, short cycle, and so on, and is beneficial for being produced in large scale. Moreover, by preparing a silicon/solid-state electrolyte composite material through coating the nano silicon with amorphous sulfide solid-state electrolyte, volume change of the silicon in a lithiation/lithium removal process can be buffered, silicon particles can be prevented from contacting the electrolyte and consequently be protected from being corroded by the electrolyte, and diffusion of lithium ions from liquid-state electrolyte to the silicon particles cannot be influenced.

The invention provides a preparation method of biomass antibacterial PP master batch and a product and application thereof. The biomass antibacterial PP master batch contains blend components: matrixresin, a biomass antibacterial agent, 1-5 wt% of a lubricant and 0.05-0.2 wt% of a composite antioxidant. Main ingredients of the biomass antibacterial agent are fruit, leaf and root of dried Chinesemahonia at the ratio of fruit to leaf to root being 1: 2-5: 3-7. The biomass materials with an antibacterial effect are mineralized by the use of amorphous mineral, and account for 10-30 wt% of mass of the master batch. The preparation method of the invention comprises the following steps: firstly placing the matrix resin, the lubricant and the biomass antioxidant into a high-speed mixer and stirring uniformly; adding the biomass antibacterial agent, mixing at high speed until the materials are uniform, and prepared by a twin-screw extruder to obtain the master batch. The antibacterial masterbatch prepared by the above method has high antibacterial rate, is used for antibacterial modification of polypropylene, and helps solve the problem that a biomass antibacterial agent cannot undergo high-temperature processing.

The invention discloses an amorphous porous silicon dioxide coated Pt/C catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing platinum nanoparticles; preparing modified platinum nanoparticles; and preparing the amorphous porous silicon dioxide coated Pt/C catalyst. According to the preparation method disclosed by the invention, the surfaces of the uniformly-loaded Pt particles are coated with the amorphous porous silicon dioxide nano-layers, so that on one hand, the platinum nano-particles can be protected and are prevented from being agglomerated in a reaction process, and the stability of the catalyst is favorably improved. On the other hand, due to the existence of a porous structure in the silicon dioxide nano layer, the process of diffusing reaction gas to the surface of Pt is not influenced, and the conductivity of the carbon carrier is not influenced, so that the catalyst has relatively high catalytic activity. The method provided by the invention does not destroy the structure of the carbon carrier, and has no influence on the reaction activity and conductivity of the carbon carrier.

The invention discloses a recombinant duck plague virus of expressing duck tembusu virus E protein as well as a construction method and application of the recombinant duck plague virus, wherein the gene of the duck tembusu virus E protein is interpolated inside the genome of the recombinant duck plague virus; and the nucleotide sequence of the duck tembusu virus E protein gene is as shown in SEQ ID NO. 9. The construction method comprises the following steps: (1) substituting the CMV promoter of gfp gene in pDEV-vac with an EF1 promoter so as to obtain pDEV-EF1; (2) interpolating a Pcmv-E-BGH-pA expression cassette into the pDEV-EF1 so as to obtain pDEV-E; and (3) transfecting the pDEV-E with chicken embryo fibroblasts and rescuing so as to obtain the recombinant duck plague virus. The recombinant duck plague virus, compared with a parent strain, has no significant difference in the size of virus plaque, showing that the diffusion of the duck plague virus on the chicken embryo fibroblasts is not affected by the interpolation of the duck tembusu virus E protein gene. After transfecting with the chicken embryo fibroblasts, the recombinant duck plague virus can successfully express E protein, so as to lay a foundation for developing duck plague virus-duck tembusu virus bivalent vaccine.

The invention discloses a surface-modified silicon-carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: purifying commercial coarse silicon, enabling the purified commercial coarse silicon to react with magnesium to obtain a magnesium-silicon alloy, carrying out thermal decomposition of the magnesium-silicon alloy to obtain nano-silicon, carrying out in-situ carbon coating to obtain a silicon-carbon nano-material, and compounding the nano-silicon carbon with fluoride through ball milling to obtain a silicon-based composite material. Compared with the prior art, the method provided by the invention is low in energy consumption, low in cost, short in period and beneficial to large-scale production. According to themethod, the volume change of silicon in the lithiation/delithiation process can be buffered, and the contact between silicon particles and the electrolyte can be prevented, so that the silicon is prevented from being corroded by the electrolyte, and the diffusion of lithium ions from the liquid electrolyte to the silicon particles is not influenced. The prepared surface fluoride modified silicon-carbon composite material is high in capacity, is high in initial coulombic efficiency, and is excellent in cycle performance.

The invention relates to the technical field of LED lamps, and discloses a breathing type LED heat dissipation lamp, which comprises a main body, a lamp groove is formed in the bottom of the main body, and an LED lamp is clamped in the lamp groove. When anarc-shaped air bag which is gradually expanded drives an air outlet pipe to move upwards to get close to a guide cavity, the arc-shaped air bag drives a patch to move upwards, the patch drives a heat dissipation pipe to move upwards, a heat dissipation pipe drives a phase-change rectangular block to move upwards, at the moment, the phase-change rectangular block stops absorbing heat to a heat conduction plate and releases heat, and at the moment, high-temperature air flow exhausted from the interior of the arc-shaped air bag drives heat air in a movable cavity to flow upwards to accelerate heat release of the phase change rectangular block, when the arc-shaped air bag is contracted, the elastic force of the adjusting spring on the adjusting rod drives the phase-change rectangular block to be downwards attached to the inclined surface of the heat conducting plate again, at the moment, the phase-change rectangular block is attached to the heat conducting plate to guide out heat absorbed by the heat conducting plate from the outer wall surface of the auxiliary pipe, the effect of accelerating dissipation of heat in the LED lamp is achieved, and the heat dissipation efficiency in the movable cavity is improved.

The invention discloses a fuel cell interior humidity-current density distribution measurement male tab, and the fuel cell interior humidity-current density distribution measurement male tab is a device for measuring fuel cell interior humidity distribution and electric current distribution, wherein a conductive substrate is provided with a leak and a tendon which correspond to a fuel cell flow field plate runner and a ridge, and a humidity-electric current density jointed measurement sensor is arranged on the tendon; the humidity-electric current density measurement sensor is manufactured by a vacuum evaporation coating method, and comprises seven layers of thin films. The vacuum evaporation coating method is adopted for manufacturing a leading wire used for transmitting an electric signal, and the leading wire extends to the edge of a flow field plate and then is enlarged to form a pin, so that the leading wire is conveniently connected with external data acquisition equipment. Synchronous on-line measurement of fuel cell interior humidity distribution and current density distribution is realized, the fuel cell interior humidity-current density distribution measurement male tab is independently arranged on a fuel cell, special remolding for the structure of the fuel cell is not needed, the fuel cell interior humidity-current density distribution measurement male tab is simple in structure, convenient in manufacturing and wide in application range, and is adaptive to a fuel cell flow field plate with a parallel runner, a snakelike runner, a stagger-type runner and other runner shapes.

The invention discloses a silicon-based anode material and a preparation method and application thereof. Specifically, a commercial silicon-containing material is subjected to high-temperature burningand pickling to obtain silicon oxide, and silicon oxide is subjected to metal thermal reduction reaction to obtain a porous layer; and the surface of the nanometer silicon is coated with a polymer byemploying an in-situ polymerization method to obtain a silicon-based composite anode material. Compared with the prior art, the inexpensive silicon oxide-containing material is taken as a precursor,the metal thermal reaction is employed to prepare the nanometer silicon, the energy consumption is low, the cost is small and the period is short to facilitate large-scale production. The in-situ polymerization polymer coats the porous nano silicon so that the prepared silicon/polymer composite anode material is high in capacity and excellent in cycle performance.

The invention discloses an internal temperature-humidity-heat flow density distribution measuring insertion sheet of a fuel cell. The internal temperature-humidity-heat flow density distribution measuring insertion sheet of the fuel cell is a measuring device for the internal temperature, the humidity and the heat flow density of the fuel cell. A leaking seam and a rib corresponding to a flow field plate runner and a ridge of the fuel cell are arranged on a conductive base plate, and a temperature-humidity-heat flow density simultaneous detection sensor is distributed on the rib; the temperature-humidity-heat flow density simultaneous detection sensor is manufactured by adopting a vacuum evaporation coating method, and comprises eight layers of films. A lead wire is also manufactured by adopting the vacuum evaporation coating method and used for transmitting an electric signal, and amplifying to form a pin for conveniently connecting with external data acquisition equipment while extending to the edge of the flow field plate. The internal temperature-humidity-heat flow density distribution measuring insertion sheet of the fuel cell can be used for realizing synchronous on-line measurement of the internal temperature distribution, the humidity distribution and the heat flow density distribution of the fuel cell. The device is independent from the fuel cell, and can be adaptive to the fuel cell flow field plates with parallel runners, S-shaped runner, staggered type runners or runners in other shapes without the need of specially modifying the structure of the fuel cell.

The invention discloses a method for surface coating modified spinel phase positive electrode material. The method comprises the following steps: 1. preparing a sol A by mixing metal salt and a chelating agent; 2, adding the spinel phase positive electrode material into the sol A and stirring so as to obtain a sol B; 3, heating and evaporating the sol B so as to obtain an xerogel; and 4, performing post-treatment on the xerogel so as to obtain the final product. According to the prepared surface coating modified spinel phase positive electrode material, the coating layer and the bulk phase material have similar crystal structure and cell parameters, and the thickness of the surface coating epitaxial growth layer is uniform so that the positive electrode material has good magnification performance and cycling performance. The method is simple and feasible, low in cost, low in energy consumption and simple in industrial large-scale production.

The invention discloses an organic coating layer, an electrode material containing the coating layer and a lithium ion battery. The electrode coating layer is a polymer coating layer, and the polymer is obtained by polymerizing a composition comprising the following components: polyester polyol, polysiloxane, electrolyte salt, diisocyanate, an additive, a chain extender and metal chloride. The coating layer provided by the invention has crosslinking sites capable of crosslinking amorphous polymer blocks and also comprises dynamic acting forces such as hydrogen bonds and coordinate bonds, so that the tear resistance of the polymer material can be remarkably improved, the strength, ductility and toughness of the elastomer material are also remarkably improved, and the self-repairing function is realized; therefore, the generation of interface side reaction and electrode expansion can be well inhibited, and the cycle performance of the battery is improved. And meanwhile, the polymer in the coating layer can also form a synergistic effect with the lithium salt, so that the electrode has excellent ionic conductivity, and the lithium ion conductivity at an interface is further improved.

The invention discloses a device and a method for reducing the toxic effect of SO2 on an SCR (selective catalytic reduction) catalyst and belongs to the technical field of coal-fired flue gas denitrification. The device comprises a porous reaction container and a molecular sieve membrane, wherein the porous reaction container is made of a porous material and used for containing the SCR catalyst; the molecular sieve membrane covers the outer surface of the porous reaction container, and the pore diameter of the molecular sieve membrane is smaller than the molecular dynamic diameter of SO2 and larger than the molecular dynamic diameters of NH3 and NO. According to the sieving characteristics of a molecular sieve, NO, NH3 and O2 can enter the container and react on the surface of the SCR catalyst to generate N2 and H2O, generated N2 can flow out of an opening end of the container, but no SO2 or only a little SO2 can enter the container through reflux, and accordingly, the toxic effect of SO2 on the SCR catalyst is greatly reduced.

The invention discloses a follow-up lifting device with warm air and a multi-point lifting-type warm air operation bed. The device can firstly judge whether a person is operating the device or not, ifthe person is operating the device, the operation intention of the person is sensed through an internal follow-up sensing mechanism, follow-up lifting is achieved along with lifting or downward pressing of the person, and after the human hand leaves an operation hole, the device cannot follow up and only plays a supporting role; a combined-type warm air pipe in the device penetrates the device upand down, and hot air can be introduced from the lower portion and led to the upper end; and air diffusion grooves have an anti-blocking function, the air diffusion grooves cannot be blocked when theupper end of the operation hole is blocked even if the air diffusion grooves are covered with bedding and a patient lies on the bedding, and therefore diffusion of the hot air is not affected. The multi-body-position adjusting operation bed is formed by combining a plurality of the devices, the supporting device at any position of the bed can be manually operated to achieve lifting, lifting adjustment and supporting of various operation body positions or postures can be achieved, and supporting stability can be kept due to the self-locking characteristic of lead screw nuts.

The invention belongs to the technical field of functional materials, and particularly relates to a heat-sensitive material, an electrode, a preparation method of the electrode and a lithium secondarybattery. According to the heat-sensitive material, polythiophene or a polythiophene derivative is added, so lithium ion diffusion and electron transmission performance are not influenced at normal temperature; when the ambient temperature rises to a certain temperature, the internal resistance of the polythiophene and derivatives thereof can be obviously increased, so that the diffusion of lithium ions and the transmission of electrons are blocked. The heat-sensitive material provided by the invention is a positive temperature coefficient heat-sensitive material, and the resistivity of the heat-sensitive material can be increased along with the rise of the temperature. The heat-sensitive material can be coated on the surface of an electrode to form a heat-sensitive material layer, when the obtained lithium secondary battery is subjected to thermal runaway and the internal temperature rises rapidly, the internal resistance of the heat-sensitive material layer is increased remarkably tobecome an insulating layer, further thermal runaway is prevented, and the safety performance of the battery is improved remarkably.

The invention provides a quantum dot preparation method, a photosensitive material layer and a photovoltaic device, and the preparation method comprises the following steps: dispersing a Grignard reagent and an anion precursor in a non-eutectic solvent to obtain a mixed solution; heating the mixed solution to a temperature range of the solution during nucleation reaction, injecting a metal halidesolution into the mixed solution for nucleation reaction, and carrying out cooling and purifying after reaction to obtain a quantum dot. By means of the characteristic of rapid crystallization of heatinjection, the quantum dots with sound peak width and few defects can be effectively and rapidly prepared, and the obtained quantum dots are high in stability and do not influence exciton diffusion.The photosensitive material layer of the photovoltaic device prepared from the quantum dot can effectively improve the charge conversion rate and prolong the service life of the photovoltaic device.

The invention discloses a Pd-based hierarchical pore mesopore-micropore TS-1 molecular sieve single crystal catalyst and a preparation method of thereof. The catalyst comprises a molecular sieve single crystal and Pd nanoparticles, the molecular sieve single crystal is an MFI type molecular sieve, is formed by stacking nanoscale small crystal grains, and has micropores and mesopores formed by stacking the nanoscale small crystal grains, and the Pd nanoparticles are uniformly loaded in mesoporous channels. The preparation method comprises the following steps: by taking a silicon dioxide pellet@porous carbon composite material as a hard template, impregnating the hard template with a structure-directing agent precursor solution to obtain a precursor, carrying out crystal transformation on the precursor by utilizing a steam-assisted crystallization method to obtain hierarchical pore TS-1 molecular sieve single crystals, and finally loading Pd by adopting an impregnation method. Pd particles in the catalyst are dispersed in mesoporous gaps stacked by molecular sieve nanocrystals, while micropores of the molecular sieve nanocrystals are completely reserved, the Pd nanoparticles are confined in mesoporous channels, and the Pd nanoparticles with high loading capacity, high dispersity, uniform distribution and small size are obtained.

The invention discloses a plug-in piece for measuring internal humidity and heat flux density distribution of a fuel battery. The plug-in piece is a device for measuring the internal humidity distribution and heat flux density distribution of the fuel battery, wherein a leak and a rib corresponding to a flow field plate passage and a ridge of the fuel battery are arranged on a conductive substrate, and a humidity and heat flux density joint measurement sensor is arranged on the rib; and the humidity and heat flux density joint measurement sensor is manufactured by adopting a vacuum evaporation coating method and comprises eight layers of films. A lead is also manufactured by adopting the vacuum evaporation coating method, is used for transmitting electric signals, and is expanded to form a pin when extending to the edge of a flow field plate so as to facilitate connection between the lead and external data acquisition equipment. By adopting the plug-in piece disclosed by the invention, the internal humidity distribution and heat flux density distribution of the fuel battery can be measured online synchronously; and the plug-in piece can be used as an independent component to be arranged in the fuel battery, is simple in structure and wide in application range, and can be matched to fuel battery flow field plates in the shape of a parallel flow passage, a snakelike flow passage, an alternative form flow passage or other flow passages.