1139 results about "Porous silicon" patented technology

The present invention relates to a porous silicon-carbon composite having a core-shell structure, a preparing method therefor, and an anode active material comprising same, wherein the core comprises silicon particles and the shell comprises two or more carbon layers including a first carbon layer and a second carbon layer, so that the application of the composite as an anode active material for a secondary battery can enhance the discharge capacity, initial efficiency, and capacity retention rate of the secondary battery. In addition, the preparing method for the porous silicon-carbon composite having the core-shell structure enables the mass production through a continuous process with minimized steps.

The invention discloses a silicon-carbon composite material and a preparation method thereof, a pole piece and a battery. The silicon-carbon composite material comprises a cluster structure and a third carbon layer coating the cluster structure, wherein the cluster structure comprises a plurality of silicon-carbon composite particles, pores are distributed among the plurality of silicon-carbon composite particles, each silicon-carbon composite particle has a core-shell structure, each silicon-carbon composite particle comprises an inner core and an outer shell coating the inner core, each outer shell sequentially comprises a first carbon layer and a second carbon layer in the direction far away from the inner core, the first carbon layer comprises a conductive carbon material with a three-dimensional structure, an annular gap exists between the second carbon layer and the first carbon layer, and the inner core comprises porous silicon nanoparticles. The battery prepared from the silicon-carbon composite material has excellent electrochemical performance.

The invention provides a doped electrode material based on porous silicon carbon and a preparation method thereof.The preparation method comprises the steps that a resin base material is smashed and then put into a high-temperature furnace to be subjected to a carbonization process, the carbonization temperature ranges from 300 DEG C to 1500 DEG C, an alkaline additive, a phosphorus source material and a nitrogen source material are sequentially added in the temperature interval, and phosphorus-nitrogen co-doped porous carbon is obtained; the preparation method comprises the following steps: mixing a silicon dioxide microsphere template into phosphorus-nitrogen co-doped porous carbon, adding a first coating carbon source to carry out first coating treatment, and etching the silicon dioxide microsphere template by using an etching solution to obtain a prefabricated object with a cavity structure; and putting the prefabricated object with the cavity structure into a fluidized bed reactor, introducing silicon source gas and a surface activation auxiliary agent, carrying out deposition at 400-550 DEG C, and then adding a second coating carbon source to carry out secondary coating treatment, thereby obtaining the doped electrode material based on porous silicon carbon. Therefore, the expansion coefficient of the electrode material is effectively reduced, and the rate capability is improved.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a conductive polymer coated silicon-carbon composite material and a preparation method and application thereof.The conductive polymer coated silicon-carbon composite material comprises a porous silicon-carbon material and a conductive polymer, and the pore width of a porous structure in the conductive polymer coated silicon-carbon composite material is smaller than the in-pore width; the porous silicon carbon material comprises porous carbon and silicon particles, the conductive polymer comprises a polymer frame and a conductive material, the conductive material comprises at least one zero-dimensional conductive substance, at least one one-dimensional conductive substance and at least one two-dimensional conductive substance, and the component content of each conductive substance meets the formula: # imgabs0 # mA is the mass percentage of the component A in the whole system, Pc is the mass percentage of the component B in the whole system, and the component B is the mass percentage of the component B in the whole system. A is the mass fraction percolation threshold of the component A in the polymer framework. According to the invention, not only can a screening type structure be effectively constructed, but also the rate capability can be greatly improved, and finally the silicon-carbon composite material with high initial efficiency, low expansion, high cycle stability and excellent fast charging performance is obtained.

The invention relates to the technical field of photovoltaic silicon crystal waste treatment, and discloses a method for preparing a porous silicon carbon negative electrode material with good conductivity from photovoltaic silicon crystal waste, and the method comprises the following steps: step 1, preparing micron-sized silicon particles; step 2, preparing micron-sized porous silicon particles; step 3, preparing nano-scale porous silicon particles which are coated by TiO2 and are supported by an N-crosslinked carbon skeleton; and 4, preparation of porous silicon carbon negative electrode particles with good conductivity: mixing TiO2 coated and N-crosslinked carbon skeleton supported nanoscale porous silicon particles with a carbon-containing compound and a B-containing sintering aid, introducing the mixture into a rotary furnace for sintering, and constructing an outermost amorphous carbon coating layer. The raw material of the prepared silicon-carbon negative electrode particle is derived from photovoltaic silicon crystal waste, the production cost is low, the prepared silicon-carbon negative electrode material with good conductivity is of a core-shell structure, the volume expansion effect of the material can be effectively relieved, the conductivity is improved, the high-rate discharge performance of a battery is improved, and the cycle life is prolonged.

The invention relates to a silicon-carbon negative electrode material as well as a preparation method and application thereof. The silicon-carbon negative electrode material comprises porous silicon and a carbon layer which is filled in pores of the porous silicon and coats the outside of the porous silicon, wherein the initial true density of the silicon-carbon negative electrode material is 1.7-2.1 g / cm < 3 >, and the change value of the true density of the silicon-carbon negative electrode material subjected to 500MPa cold pressing compared with the initial true density is 4-10%. According to the invention, the problem of volume expansion (greater than 300%) of the silicon negative electrode material in the charging and discharging process of the lithium ion battery can be effectively solved, the first discharge capacity and the first coulombic efficiency of the silicon-carbon negative electrode material are greatly improved, and the lithium ion battery adopting the silicon-carbon negative electrode material disclosed by the invention has better cycle performance.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

The invention provides an amorphous copper nanolayer coated spherical porous silicon composite material and a preparation method and application thereof.The preparation method includes the step that the surface of spherical porous silicon is coated with an amorphous copper conductive nanolayer through a simple solution method.On the basis of the principle of replacement reaction, aluminum in aluminum-silicon alloy is replaced with copper to be coated on the surface of silicon, and the amorphous copper nanolayer coated spherical porous silicon composite material is obtained. And meanwhile, the rate of the replacement reaction is slowed down by utilizing different reaction activities of copper chloride in an organic solvent, so that the spherical morphology is kept, and meanwhile, the surface of silicon can be coated with a layer of amorphous copper nano layer with high conductivity. The invention also provides a preparation method of the material. Tests find that the conductivity of the material can be effectively improved due to the excellent conductivity of the copper nano layer, and the volume expansion effect of the material in the electrochemical cycle process can be effectively relieved due to the porous structure. Therefore, the combination of the two effectively improves the problems of poor conductivity and unstable structure of the silicon negative electrode material, and effectively improves the application performance of the silicon negative electrode material in the lithium ion battery negative electrode.

The invention relates to a silicon-carbon composite material with a porous structure and a preparation method thereof, and the silicon-carbon composite material with the porous structure comprises an N / P co-doped porous carbon skeleton with micropore, mesopore and macropore channel networks, and amorphous or low-crystalline nanometer silicon particles which are uniformly loaded in the porous carbon skeleton and have the average particle size of 15-40nm, the mass percent of silicon in the composite material is 40-60%, and good interface bonding is formed between silicon and carbon. The preparation method mainly comprises the following steps: firstly, preparing an N / P co-doped porous carbon skeleton through a template method in combination with high-temperature carbonization and N / P source co-pyrolysis; and hydrolyzing an organic silicon source in the carbon skeleton to form silicon dioxide, and performing low-temperature metal thermal in-situ reduction to obtain the nano-silicon loaded composite material. Through a unique porous carbon skeleton design and a precise in-situ composite strategy of nano silicon, the prepared material shows high specific capacity, high initial coulombic efficiency and excellent cycling stability and rate capability when being used as a negative electrode of a lithium ion battery.

The invention discloses a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery negative electrode materials. The material sequentially comprises a porous silicon core, a transition layer and a shell from inside to outside, the transition layer is a nitrogen-doped SiC / C composite layer, the shell comprises a graphene / carbon nanotube skeleton and MXene quantum dots, the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton, boric acid ester bonds exist between carbon nanotubes and graphene, and the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton. The silicon-carbon negative electrode material is based on dual-network dynamic bonding and stress gradient regulation and control, the cycle performance of the material can be remarkably improved, and the service life of the material can be remarkably prolonged.

The invention discloses an impact-resistant packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the impact-resistant packaging material is prepared, the zinc oxide-loaded porous silicon dioxide microspheres and the phosphorus-silicon synergistic flame retardant react to prepare functionalized porous silicon dioxide microspheres; the preparation method comprises the following steps: reacting 4-[2, 2 ': 6', 2 ''-terpyridyl]-4 '-yl-benzylamine with ethyl acrylate to prepare a terpyridyl diester monomer; the preparation method comprises the following steps: carrying out condensation polymerization on ethylene glycol, a terpyridyl diester monomer and benzophenone-4, 4 '-diethyl diformate to prepare functional polyester; the functionalized polyester and 2-aminoethyl-2-cyanoacetate are subjected to a reaction, and modified polyester is prepared; and carrying out melt blending on the modified polyester, the functionalized porous silicon dioxide microspheres, zinc chloride and 1, 6-dichlorohexane, and carrying out compression molding to obtain the impact-resistant packaging material. The impact-resistant packaging material prepared by the invention has excellent anti-aging, impact-resistant, flame-retardant and antibacterial properties.

The invention discloses a preparation method of a dual-pH intelligent response drug-loaded ureteral stent, which belongs to the technical field of medical instruments, and is characterized in that the dual-pH intelligent response drug-loaded ureteral stent comprises a dual-pH intelligent response drug-loaded coating and a bare stent; wherein the dual pH intelligent response drug-loading coating contains polymer-modified porous silicon dioxide drug-loading particles, and the main effect of the drug-loading coating is that after the pH of the internal environment of the ureteral stent is changed due to bacterial infection, the antibacterial agent is controllably released through the structural change of the drug-loading particles or the property of the surface polymer is changed, so that the bactericidal ability is improved; and a complex infection environment can be accurately dealt with.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a preparation method and application of a high-efficiency silicon-carbon composite graphite material, and the preparation method comprises the following steps: S1, carrying out porosity and size regulation and control on silicon particles: carrying out ball milling on industrial-grade silicon powder to obtain nano silicon particles, and carrying out acid etching to form a porous structure; s2, functional surface treatment and interface optimization: introducing functional molecules to the surfaces of the silicon particles and coating a layer of ultrathin SiO2 protective film; and S3, carbon coating and flexible protection layer construction: performing pyrolysis on the porous silicon particles by using a carbon source to form a uniform carbon coating layer which is applied to a lithium ion battery negative electrode material, and the lithium ion battery is used for an electric vehicle, a power grid energy storage system and portable electronic equipment. Through the collaborative design of the flexible protection layer, the double-layer carbon coating and the gradient coating, the technical bottlenecks of the silicon-based negative electrode material in the aspects of long cycle stability, high rate performance and interface chemical stability are systematically solved.

The invention belongs to the technical field of porous silicon nitride ceramics, and discloses a porous silicon nitride ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing silicon nitride ceramic powder, metal oxide powder and rare earth metal oxide powder, adding a pore forming agent and a grinding medium, mixing, and carrying out ball milling, drying, grinding and sieving to obtain ceramic powder; carrying out dry pressing molding on the ceramic powder to obtain a ceramic green body; carrying out glue discharging treatment on the ceramic green body to obtain a precursor; the precursor is subjected to ultrahigh-temperature rapid sintering treatment, and the porous silicon nitride ceramic is obtained; wherein the sintering temperature ranges from 1600 DEG C to 1900 DEG C. According to the porous silicon nitride ceramic prepared by the method, the porosity is wide and adjustable in range, and the porous silicon nitride ceramic with closed spherical pore morphology can be prepared.

The invention discloses an MEMS device and a preparation method thereof, and the preparation method comprises the steps: providing a first wafer, forming a cavity in the upper part of the first wafer, and forming a porous silicon layer at the bottom of the cavity; providing a second wafer with an etching stop layer on the surface, and bonding the upper side of the first wafer and the etching stop layer; a boss and a first bonding metal layer located on the boss are formed on the side, away from the first wafer, of the second wafer; forming a groove penetrating through the second wafer in the second wafer, and removing the etching stop layer between the cavity and the second wafer to form a suspended comb tooth structure; and providing a third wafer with a patterned second bonding metal layer on the surface, and bonding the second bonding metal layer and the first bonding metal layer to form a vacuum chamber. According to the technical scheme, the quality factor of the MEMS device can be remarkably improved.

The invention discloses a phosphate functionalized silicon-based solid adsorbent and application thereof, and belongs to the technical field of yttrium separation and purification, a preparation method comprises the following steps: step 1, synthesizing silicon-based resin particles SiO2-P by using spherical porous silicon dioxide as a solid-phase carrier and styrene as a raw material through an in-situ polymerization technology, and 2, synthesizing the phosphate-functionalized silicon-based solid adsorbent HDEHP / SiO2-P by using di (2-ethylhexyl) phosphate HDEHP as a raw material and utilizing a vacuum impregnation technology. Therefore, the phosphate functionalized silicon-based solid adsorbent and the application thereof are adopted in the invention. The phosphate can specifically and selectively extract trivalent yttrium ions, so that efficient separation of yttrium and strontium is realized, high-purity yttrium can be obtained through separation and purification after elution, and a solid adsorbent can be recycled.

The invention discloses a porous silicon-carbon negative electrode material of a lithium ion battery as well as a preparation method and application of the porous silicon-carbon negative electrode material. The preparation method comprises the following steps: firstly, activating silicon nanoparticles by using a surfactant, so that the silicon nanoparticles are positively charged, and agglomeration of the silicon nanoparticles is avoided; secondly, nano active silicon and graphite are uniformly mixed and ball-milled, so that the active silicon is anchored in a graphite layer, and the conductivity of the whole material is improved; and uniformly mixing and ball-milling the silicon / graphite composite material, asphalt and potassium chloride, and then annealing and washing to obtain the porous silicon-carbon composite material. The activated nano silicon can effectively prevent agglomeration of nano silicon particles, the porous carbon prepared by taking potassium chloride as a template agent has the characteristics of environmental protection and no pollution, the potassium chloride can be recycled, and the prepared porous silicon carbon negative electrode material can enable a lithium ion battery to have relatively high initial coulombic efficiency and excellent cycling stability.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a secondary battery. The negative electrode active material comprises: a core part comprising porous micron silicon particles and titanium dioxide nanowires; the shell part is coated on at least part of the surface of the core part, and the shell part comprises a carbon coating layer and carbon nanotubes dispersed on the carbon coating layer; wherein one ends of at least part of the titanium dioxide nanowires are arranged on the hole walls of the porous silicon particles, and the other ends of at least part of the titanium dioxide nanowires extend out of the porous silicon particles. According to the negative electrode active material provided by the invention, through the synergistic effect among the porous structure of the porous micron silicon particles, the titanium dioxide nanowires, the carbon coating layer and the carbon nanotubes, the structural stability of the negative electrode active material is improved, the volume energy density of the micron silicon material is ensured to be exerted, and the cycle performance and the rate capability of the battery are improved.

The invention relates to the technical field of chemical catalysis, in particular to a copper-silicon catalyzed cyclohexanol gradient dehydrogenation and hydrogen recycling method which comprises the following steps: step 1, preparing a gradient catalyst, namely carrying out surface hydroxyl regulation pretreatment on porous silica gel, and loading a copper salt solution by adopting a step-by-step impregnation method to form gradient distribution with gradually decreased copper loading capacity from outside to inside, carrying out segmented heating reduction in a reducing atmosphere containing 5vol% of H2 / N2; 2, gradient dehydrogenation reaction process control; and 3, hydrogen in-situ separation and cyclic utilization: separating hydrogen from the reaction outlet gas through a palladium alloy membrane, controlling the pressure difference of the two sides of the membrane to maintain the permeation flux, returning the separated hydrogen to the inlet of the reactor to adjust the hydrogen partial pressure, and storing the residual hydrogen. Through gradient catalyst preparation, accurate reaction process control and efficient hydrogen recovery technologies, the cyclohexanone production efficiency is improved, and long-term stability of the catalyst and efficient recycling of hydrogen are achieved.

The invention discloses a silicon-tin-carbon composite material as well as a preparation method and application thereof, and the silicon-tin-carbon composite material sequentially comprises a porous silicon core, a first coating layer and a second coating layer from inside to outside, the first coating layer comprises a porous carbon material and tin located in pores of the porous carbon material, and the second coating layer comprises an amorphous carbon coating layer; pores of the porous silicon core contain tin and a porous carbon material. Tin of the silicon-tin-carbon composite material is located in pores of the porous carbon layer, so that the problem of tin expansion and the problem of tin agglomeration in the subsequent high-temperature carbonization process are buffered; meanwhile, a porous composite layer formed by tin and a porous carbon material is compounded to the surface and pores of the porous silicon core, so that the surface defects of porous silicon are repaired, and the expansion of silicon is limited to a certain extent; and on one hand, the outermost coated carbon layer can inhibit the volume expansion of silicon and tin in the charging and discharging process and increase the conductivity of the composite material.

The invention provides a silicon-carbon negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery negative electrode materials. A preparation method of a silicon-carbon negative electrode material comprises the following steps: S1, reacting metal magnesium with silicon monoxide in an inert atmosphere at normal pressure and high temperature to obtain an initial product; performing acid pickling, water washing and drying on the primary product to obtain a secondary product; and crushing, grading and demagnetizing the secondary product to obtain the porous silicon negative electrode material. S2, dipping the porous silicon negative electrode material in an asphalt mixed solution, stirring, drying, and performing high-temperature carbonization to obtain a silicon-carbon matrix composite material; and S3, carrying out vapor deposition carbon coating on the silicon-carbon matrix composite material, cooling, and screening to obtain the silicon-carbon negative electrode material. The negative electrode material provided by the invention has excellent physical and chemical properties and electrochemical properties.

The invention belongs to the technical field of new energy, and particularly discloses a catalyst for catalyzing conversion of glucose into 5-hydroxymethylfurfural and a preparation method of the catalyst. The method is used for solving the problem of low HMF selectivity in the process of converting glucose into HMF. The preparation method comprises the following steps: firstly, synthesizing hollow mesoporous silicon spheres in the presence of absolute ethyl alcohol by taking hexadecyl trimethyl ammonium bromide as a structure-directing agent, ammonia water for providing an alkaline environment and tetraethyl orthosilicate as a silicon source of silicon dioxide; then, filling sucrose serving as a carbon source into the hollow meso-porous silicon spheres, and carbonizing and removing silicon to obtain meso-porous carbon microspheres; and finally, dipping the mesoporous carbon microspheres in a tin tetrachloride pentahydrate solution to prepare the tin-loaded mesoporous carbon microsphere catalyst. The catalyst has a large specific surface area, an excellent pore structure and good hydrothermal stability, has two acidic sites of Lewis acid and # imgabs0 # acid at the same time, and can efficiently catalyze conversion of glucose into HMF.

The invention discloses a low-cost zero-strain high-capacity fast-charging porous silicon carbon negative electrode material as well as a preparation method and application thereof, and belongs to the field of energy storage. According to the method, a spherical plant-based biomass material is used as a raw material, and is compounded with a high-molecular polymer and a molten salt pore-forming agent to prepare the spherical interconnected hierarchical porous carbon material. In the high-temperature carbonization and pore-forming process of the molten salt, part of metal compounds are subjected to carbothermal reduction to form metal elementary substances, the metal elementary substances serve as active sites for silanization gas, and catalytic reduction growth of superfine silicon nanoparticles is carried out in pores of the interconnected hierarchical porous spherical carbon in a uniformly dispersed manner. The hierarchical interconnected pore structure of the obtained material can relieve volume expansion in the charge-discharge process, optimize electron density distribution and promote charge transfer, so that the conductivity and ion transmission rate of a final product are improved; the dispersed superfine silicon nanoparticles enable the prepared silicon carbon negative electrode to have zero strain, high capacity, fast charging performance and excellent cycling stability, so that the silicon carbon negative electrode becomes a potential ideal material of silicon carbon.

The invention provides a contact type thermal resistance dynamic measurement system and a measurement method, and belongs to the technical field of thermal resistance measurement. According to the method, accurate characterization of the heat conduction characteristic of a complex interface is achieved through multi-physical field data fusion and a real-time compensation mechanism, firstly, initial reference pressure is set based on contact surface three-dimensional shape extraction and material attributes, and heat-force-flow multi-source data are synchronously collected through a multi-parameter measurement execution module; combining a weighted Kalman filtering algorithm and a phase change-seepage coupling correction model, and dynamically optimizing heat flow density data to eliminate phase change latent heat and micro-flow interference; and for abnormal fluctuation, a combined control strategy of fuzzy PID pressure regulation, high-frequency ultrasonic liquid film stabilization and porous silica gel vibration suppression is adopted, and + / -1% steady-state thermal resistance output is achieved. According to the method, cloud parameter iterative optimization and a fault self-diagnosis mechanism are integrated, and the robustness and reliability of measurement in dynamic high-noise scenes such as lithium battery pole piece expansion and geothermal wellbore unsteady-state heat transfer are remarkably improved.

The invention provides a negative pole piece, a secondary battery and an electric device. The negative pole piece comprises a current collector and a negative pole film layer, and the negative pole film layer comprises a first film layer arranged on one side or two sides of the current collector; the second film layer is arranged on one side, far away from the current collector, of the first film layer; the negative electrode active material in the first film layer and the negative electrode active material in the second film layer respectively and independently comprise a silicon-based negative electrode material, the silicon-based negative electrode material in the second film layer comprises a porous silicon negative electrode material, and the content of the silicon-based negative electrode material in the first film layer is smaller than that of the silicon-based negative electrode material in the second film layer. And the charging capability and the cycle performance of the secondary battery are improved.

The invention discloses a high-utilization-rate ginseng active ingredient medicinal preparation and a preparation method thereof, and relates to the technical field of medicines. The high-utilization-rate ginseng active ingredient pharmaceutical preparation is prepared from chitosan coated drug-loaded porous silicon dioxide composite nanoparticles and a drug-loaded MIL-101 metal organic framework matrix material, chitosan-coated drug-loading porous silicon dioxide composite nanoparticles are loaded on the surface of a drug-loading MIL-101 metal organic framework base material, and sodium alginate and a chitosan gel material are subjected to cross-linking connection, so that independent coating is formed, the framework base material and the composite nanoparticles are connected into a whole, the encapsulation performance and the drug loading capacity are improved, and the drug-loading capacity of the drug-loading MIL-101 metal organic framework composite nanoparticles is improved. Furthermore, the loading and the loading stability of the ginsenoside are improved, the adverse effects of gastric juice and gastrointestinal peristalsis on the activity of the ginsenoside are effectively reduced, the release and the absorption of the ginsenoside in intestinal tracts are remarkably enhanced, and the bioavailability is relatively high.

The invention discloses a laser illumination ceramic phosphor with adjustable emergent light spots and a preparation method of the laser illumination ceramic phosphor. The ceramic phosphor comprises a light conversion layer and a light scattering layer covering one surface of the light conversion layer. Wherein the light scattering layer is composed of a porous silicon dioxide sublayer and a compact silicon dioxide sublayer, and the porosity of the porous silicon dioxide sublayer is larger than that of the compact silicon dioxide sublayer. The invention has the following beneficial effects: on the premise that the luminous efficiency of the fluorescent material is not reduced, the problem of non-uniform distribution of light spot color and brightness of light emitted by a laser illumination product is effectively improved, and uniform white light emission is obtained.

The invention relates to a slow-release antifouling material, a preparation method thereof and a marine antifouling coating. The preparation method of the slow-release antifouling material comprises the following steps: carrying out amination modification on porous silicon oxide to obtain aminated porous silicon oxide; loading a carboxylic acid natural antifouling agent on the aminated porous silicon oxide to obtain an aminated porous silicon oxide antifouling agent; blocking pore channels in the aminated porous silicon oxide-antifouling agent by adopting gelatin to obtain aminated porous silicon oxide-antifouling agent-gelatin, so as to obtain aminated porous silicon oxide-antifouling agent-gelatin; and mixing the aminated porous silicon oxide, antifouling agent and gelatin with a chitosan solution at 25-45 DEG C for at least 0.5 hour, collecting a product, and drying to obtain the slow-release antifouling material. According to the slow-release antifouling material, the release rate of the antifouling agent can be reduced, and the protection effect on marine equipment is improved.

The invention provides a double-layer coated porous silicon carbon negative electrode material and a preparation method thereof.The preparation method comprises the steps that a carbon precursor and a doped precursor are evenly mixed, inert gas is introduced into a chemical vapor deposition furnace, the temperature is adjusted to 400-500 DEG C, meanwhile, silicon source gas is introduced, the reaction time is controlled to be 500-1000 minutes, and a porous silicon carbon framework is obtained, the doped precursor comprises a silicon source material; heating the porous silicon carbon skeleton to 450-550 DEG C, introducing oxygen-containing gas, and reacting for 200-800 minutes to obtain an oxygen-silicon layer deposited on the surface of the porous silicon carbon skeleton; dispersing the porous silicon carbon skeleton with the oxygen silicon layer in a mixed solvent, adding a modified coupling agent and a lithium salt, stirring for 1-5 hours at room temperature, adding a polymer solution after stirring, stirring for 1-5 hours at room temperature, generating a polymer layer on the oxygen silicon layer, and washing and drying to obtain the double-layer coated porous silicon carbon negative electrode material. Therefore, the cycle performance of the negative electrode material is effectively improved.

The invention discloses a silicon monoxide-based negative electrode material and preparation and application thereof, and belongs to the technical field of lithium ion battery preparation, and the preparation method comprises the following steps: bombarding pure silicon monoxide powder by nitrous oxide plasma to form N-attached modified porous silicon monoxide powder; more lithium ions can be accommodated for intercalation and deintercalation due to the porosity, the volume effect of the material in the electrochemical reaction process can be relieved, so that the cycle life of the battery is prolonged, and meanwhile, the N element is doped in the generated carbon layer, so that the conductivity and the lithium storage capacity are improved; the two prepared coating layers form a compact carbon coating layer after high-temperature carbonization, the structural integrity of the silicon monoxide negative electrode material in the charging and discharging process is enhanced, the compact carbon coating layer can effectively relieve stress caused by volume change and reduce repeated generation and fracture of an SEI film in the embedding and de-embedding process of lithium ions, and the lithium ion battery has the advantages of being simple in preparation process, low in cost and high in reliability. The first coulombic efficiency is improved, and the capacity and performance stability of the battery can be maintained.