104 results about "Magnesium fluoride" patented technology

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

The invention belongs to the field of electronic packaging materials, and particularly relates to a high-thermal-conductivity ceramic material for LED packaging and a manufacturing process of the high-thermal-conductivity ceramic material for LED packaging. The high-thermal-conductivity ceramic material is prepared from silicon nitride, aluminum nitride, magnesium fluoride, yttrium fluoride, lithium carbonate and two newly-designed modified compounds. The phase change regulator is composed of a boron-doped rare earth silicate nanocrystalline phase change regulator and a bimetallic chalcogenide compound interface modifier according to a specific weight part ratio. The preparation process mainly comprises the following steps: ball-milling and mixing the components, drying, granulating, and carrying out segmented hot pressed sintering in a protective atmosphere to finally obtain the compact ceramic material. The high-power LED packaging structure is particularly suitable for packaging of high-power LEDs, and the technical problem that heat dissipation and mechanical performance are difficult to consider at the same time is effectively solved.

This invention discloses a method for deep removal of calcium and magnesium from battery-grade manganese sulfate solution, belonging to the field of hydrometallurgical technology. The invention employs a three-stage purification process: pretreatment for impurity removal, gradient precipitation with manganese fluoride, selective extraction, and chelating resin refinement. First, the manganese sulfate leachate undergoes pretreatment to remove iron, aluminum, and heavy metals. Then, an in-situ / direct addition of manganese fluoride precipitation system using magnesium fluoride seeding and gradient fluoride supplementation efficiently removes most calcium and magnesium impurities from the solution, achieving a single-precipitation rate of over 93% for magnesium ions. Subsequently, a P507 / Cyanex272 / TBP compound saponification organic system is used with a reverse extraction logic of "extracting calcium and magnesium while retaining manganese in the aqueous phase" to precisely remove residual calcium and magnesium, avoiding the problems of competition between manganese and calcium and low magnesium extraction efficiency in traditional extraction methods. Finally, trace amounts of calcium, magnesium, and residual fluoride ions are completely removed through aluminum salt complexation for fluoride removal combined with deep refinement using aminocarboxylic acid chelating resin. This invention introduces no foreign impurities such as sodium and ammonium throughout the entire process, has a wide process window and strong industrial stability, and the final purified manganese sulfate solution can stably meet the high-end battery-grade index requirements of Ca²⁺≤5mg / l, Mg²⁺≤5mg / l, and F⁻≤1mg / l, making it suitable for the large-scale production of high-purity manganese sulfate, a raw material for lithium battery cathodes.

The invention belongs to the technical field of electrical equipment insulating materials, and particularly relates to a short-wave sensitive type high-light-transmittance composite insulating material and a preparation method thereof. The short-wave sensitive high-transmittance composite insulating material comprises the following components in percentage by mass: 55-65% of epoxy resin, 30-40% of modified aluminum oxide filler, 2-5% of an interface enhancer and 3-5% of a curing agent, wherein the modified aluminum oxide filler is aluminum oxide particles of which the surfaces are coated with nanoscale magnesium fluoride coatings; the interface reinforcing agent is a compound of a silane coupling agent and polyvinyl alcohol.

An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

The present application relates to the technical field of nuclear fuel cycle, and particularly relates to a method for recycling uranium fluorination wastewater. The method is as follows: adjusting the concentration ratio of bicarbonate and carbonate in the uranium conversion leaching solution, carrying out decolorization and filtration treatment to obtain a filtrate; the filtrate is subjected to uranium adsorption through a resin, and the resin adsorbed with uranium is subjected to leaching; the adsorption tail liquid is added with magnesium hydroxide slurry to adjust the pH to above 11, and then filtered, and the filtrate is adsorbed by amidoamine-based adsorption fiber; the adsorption tail liquid is added with magnesium carbonate slurry to generate magnesium fluoride and carbonate ions, and then filtered to obtain a sediment and a filtrate respectively; the filtrate is returned as a leaching agent of fluorination tail gas or is discharged after treatment; the sediment is used together with new magnesium carbonate to participate in fluorine removal reaction again, and the unreacted magnesium carbonate is used again. The present application realizes efficient recovery of uranium in the leaching solution and recycling of the leaching solution, fully utilizes the residual alkali in the returned liquid, reduces the treatment cost of fluorination tail gas, controls the radioactivity of the waste residue, and realizes radioactivity exemption of the treated sediment.

This invention relates to the field of co-processing and resource utilization of fluorine- and silicon-containing solid waste, specifically disclosing a high-quality, tiered resource utilization process for fluorosilicone slag. This process uses fluorosilicone slag as raw material, sequentially undergoing alkali dissolution activation, acidification polymerization, primary defluorination crystallization, secondary deep defluorination, and salt resource recovery steps to produce washed silica, magnesium fluoride, cryolite, and sodium sulfate, while simultaneously achieving mother liquor recycling and wastewater reduction. This invention features a short process flow, closed-loop material circulation between units, and a SiO2 recovery rate of over 95% in the fluorosilicone slag. The silica, magnesium fluoride, cryolite, and sodium sulfate products meet relevant national or industry standards, achieving high-quality, tiered resource utilization and overall wastewater reduction for fluorosilicone slag.

The application provides a high-thermal-conductivity radiation refrigeration coating for a 5G communication base station cabinet and a preparation method thereof, and belongs to the technical field of coatings. A SiC@BN / TiB2 three-phase fiber framework obtained through three-stage calcination is bonded with methylphenyl silicone resin through a silane coupling agent to form a longitudinal high-speed thermal conduction framework. Starburst calcium titanate and edge in-situ magnesium fluoride form a refractive index ladder and a rough multi-faceted structure, which not only reflects ultraviolet-near infrared light, but also endows weather resistance. Holmium / ytterbium co-doped calcium fluoride nanosheets are transversely overlapped to scatter near infrared light and convert the near infrared light into medium-far infrared radiation which can penetrate the atmospheric window, thereby further dissipating heat. Through mutual cooperation of a longitudinal continuous heat conduction path, a transverse heat dissipation network, optical multiple scattering and energy downshift radiation, stable chemical bond network support is achieved to realize high-efficiency, long-term reliable heat dissipation performance.

The application belongs to the field of optical film and surface engineering, and provides a hydrophilic magnesium fluoride film preparation method based on magnetron sputtering, which realizes effective regulation and control of the hydrophilic performance of the magnesium fluoride film surface through sputtering power and maintains good optical transmittance. In the application, first, the substrate is subjected to ultrasonic cleaning treatment, then the substrate is placed in a vacuum chamber of a magnetron sputtering device, magnesium fluoride is used as target material, and the vacuum chamber is vacuumized to a base vacuum degree; then, inert gas is introduced into the vacuum chamber, the sputtering power is adjusted to 20-50 W, and the magnesium fluoride film is deposited on the substrate surface in a radio frequency magnetron sputtering mode; the application realizes continuous regulation and control of the hydrophilic performance of the magnesium fluoride film surface by regulating and controlling the sputtering power; with the increase of the sputtering power, the surface roughness of the film increases, the water contact angle significantly decreases, and the hydrophilicity is enhanced; and the method does not introduce additional materials, has simple process and good repeatability, and the prepared magnesium fluoride film maintains high transmittance in the visible light range.

The invention discloses a hydrogenation catalyst which is a supported catalyst, the catalyst is in a particle shape, the particles are porous metal fluoride embedded with palladium element, the porous metal fluoride is selected from one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide, and the palladium element is one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide. The invention also provides a preparation method of the catalyst. According to the catalyst prepared by the method, the synthesis yield and conversion rate are high in the process of synthesizing HFC-236ea from C3F6 and synthesizing HFC-245eb from HFO-1225ye, and the product purity and yield are excellent. According to the catalyst used in the invention, aluminum oxyfluoride is used as a carrier of metal palladium, Pd particles and a carrier interface are tightly combined, and a falling sign does not appear, so that the Pd component is excellent in dispersity, and the reaction rate and the raw material conversion rate are favorably improved.

The invention relates to the technical field of fluorine-containing and silicon-containing solid waste co-processing and resource utilization, and particularly discloses a fluorine-silicon slag gradient high-quality recycling process. According to the process, the fluorine-silicon slag is used as a raw material and is sequentially subjected to the steps of alkali dissolution activation, acidification polymerization, first-stage fluorine removal crystallization, second-stage deep fluorine removal and salt resource recovery, products such as washed white carbon black, magnesium fluoride, cryolite and sodium sulfate are prepared, and meanwhile mother liquor recycling and wastewater reduction are achieved. According to the method, the technological process is short, closed-loop circulation of materials is achieved among the units, the recovery rate of SiO2 in the fluorosilicon slag can reach 95% or above, white carbon black, magnesium fluoride, cryolite and sodium sulfate products meet relevant national or industrial standard requirements respectively, and gradient high-quality recycling and whole-process reduction of the fluorosilicon slag are achieved.

The invention relates to a method for treating aluminum electrolysis hazardous waste by using magnesium oxide, which comprises the following steps: carrying out pretreatment such as crushing and screening on the aluminum electrolysis hazardous waste, and then mixing with a proper amount of magnesium oxide; and adding ammonia water into the prepared alkaline solution, selectively leaching the mixed material, and filtering to obtain a lithium-containing leachate and a magnesium fluoride product. An alkaline solution serves as a leaching agent, magnesium oxide serves as a fluorine trapping agent, ammonia water serves as a magnesium ion activating agent, efficient treatment of fluorine and lithium resources in the waste aluminum electrolyte is achieved, lithium enters a liquid phase to be recycled, magnesium, fluorine and the like enter a slag phase in the form of magnesium fluoride, the purity is high after weak acid washing, and the waste aluminum electrolyte can be directly sold.

This invention discloses a mid-to-far-infrared ultra-wideband neutral beamsplitter based on KBr crystal, its fabrication method, and its applications, relating to the field of optical thin film technology. The KBr crystal-based mid-to-far-infrared ultra-wideband neutral beamsplitter includes a KBr crystal substrate; a front surface adhesive layer disposed on the front surface of the KBr crystal substrate; an ultra-wideband neutral beam splitter disposed on the surface of the front surface adhesive layer; a rear surface adhesive layer disposed on the rear surface of the KBr crystal substrate; and an ultra-wideband protective film disposed on the surface of the rear surface adhesive layer. The front and rear surface adhesive layers are both magnesium fluoride thin films; the ultra-wideband neutral beam splitter has a multilayer dielectric film structure; and the ultra-wideband protective film is a barium fluoride thin film. This invention innovatively introduces a double-sided composite thin film structure of "front surface adhesive layer + beam splitter system" and "rear surface adhesive layer + protective layer".

The invention discloses a preparation method of a low-oxygen magnesium fluoride crystal, and belongs to the technical field of crystal preparation. After the raw materials are molten, the mixed gas activated by the catalytic net is introduced into the crystal furnace in an intermittent pulse mode, active fluorine species in the mixed gas and oxygen impurities on the surface of the melt can be subjected to fluorination reaction so as to reduce the content of the oxygen impurities, airflow in the intermittent pulse ventilation mode is matched with rotation of the crucible to disturb the melt, a reaction interface is updated, and the reaction efficiency is improved. And finally, the low-oxygen magnesium fluoride crystal is obtained through a pulling method.

The application discloses a method for plating a magnesium fluoride film with nitrogen ion assistance, and relates to the field of vacuum plating, and comprises the following steps: preparing a vacuum cavity for plating; a substrate and magnesium fluoride material are arranged in the vacuum cavity; the temperature in the vacuum cavity is lower than 250 DEG C; preparing an ion source; the ion source is communicated with the vacuum cavity; nitrogen gas is filled into the ion source, and the nitrogen gas is ionized into nitrogen ions in the ion source; the nitrogen ions are introduced into the vacuum cavity, and the magnesium fluoride material is deposited on the surface of the substrate under the assistance of the nitrogen ions to form a magnesium fluoride film. The method for plating a magnesium fluoride film with nitrogen ion assistance provided in the specification can significantly reduce the lower limit of stress of the film layer and increase the adjustment window of the process.

The invention belongs to the technical field of optical crystal preparation, and provides a magnesium fluoride crucible descending type directional crystallization purification method for ultraviolet optical crystal manufacturing. Magnesium fluoride raw materials are placed in a vacuum furnace to be subjected to desorption pretreatment, then the raw materials are fused, subjected to heat preservation and homogenized, first-process directional crystallization is achieved through descending displacement of a crucible relative to a hot area, a first ingot body is obtained, impurities are enriched towards the tail end along with the crystallization process, and only a local section of the enriched end is heated and remelted to form a controlled molten pool; the middle-section main body is kept in a solid state; the temperature gradient direction is reversed by switching the power ratio of a heating area, the molten pool is subjected to second-process directional crystallization in the opposite direction to form a second ingot body, the second ingot body is axially cut in a segmented mode, a middle purification section is reserved to serve as a high-purity raw material, and the middle purification section can be repeatedly executed in the same furnace to obtain a raw material section; according to the method, segregation enrichment and reverse ending are completed in a clean atmosphere, and the method is suitable for manufacturing magnesium fluoride crystals for ultraviolet optical elements.

The invention belongs to the technical field of LED manufacturing, particularly relates to a UVB LED chip and a preparation method, and aims to improve the light transmittance of the UVB LED chip. The UVB LED chip comprises a substrate, an antireflection film, a filtering film, an N-type semiconductor layer, an active layer and a P-type semiconductor layer. The antireflection film is located on the surface of one side of the substrate, the filtering film is located on the side, away from the substrate, of the antireflection film, the N-type semiconductor layer is located on the side, away from the substrate, of the filtering film, the active layer is located on the side, away from the substrate, of the N-type semiconductor layer, and the P-type semiconductor layer is located on the side, away from the substrate, of the active layer. Wherein the material of the anti-reflection film comprises at least one of magnesium fluoride, aluminum fluoride and aluminum oxide, the thickness of the anti-reflection film is lambda / 4n, lambda is the target wavelength of the anti-reflection film, and n is the material refractive index of the anti-reflection film. The filtering film is a single-layer or multi-layer interference filtering film, and the material of the filtering film comprises at least one of titanium oxide, hafnium oxide, aluminum oxide, silicon dioxide and aluminum fluoride.

The invention relates to the technical field of optical coating, and particularly discloses a preparation method of coated glass for an optical sensor and the coated glass, the preparation method of the coated glass for the optical sensor comprises the following steps: S1, pretreating an optical glass matrix to obtain pretreated glass; s2, carrying out magnetron sputtering on the surface of the pretreated glass to form a silicon dioxide layer, then carrying out magnetron sputtering on a magnesium fluoride layer, and alternately arranging 5-6 layers to obtain a semi-finished product; s3, the surface of the semi-finished product is subjected to ion beam polishing treatment, and coated glass is obtained; the coated glass prepared by the preparation method of the coated glass for the optical sensor has the advantage of reducing interference of ambient light on PPG signals in a broadband.

The utility model discloses a film-coated cover plate and a liquid crystal display capable of improving electromagnetic shielding performance, the film-coated cover plate comprises a glass substrate, and a magnesium fluoride layer, a methacryloxysilane layer and a titanium nitride layer which are sequentially stacked on the upper surface of the glass substrate from bottom to top, the thickness of the magnesium fluoride layer is 5nm-10nm, the thickness of the methacryloxysilane layer is 5nm-10nm, and the thickness of the titanium nitride layer is 5nm-10nm. The thickness of the methacryloxysilane layer is 20 nm to 30 nm, and the thickness of the titanium nitride layer is 5 nm to 10 nm. The magnesium fluoride layer utilizes the characteristics of excellent light transmittance and low refractive index, so that light reflection is reduced, and the light transmittance and definition are improved; the performance of the cover plate is further enhanced through the high hardness, the scratch resistance and the potential electromagnetic shielding function of the methylacryloyloxy silane layer; and the titanium nitride layer serves as the outermost layer, additional hardness and wear resistance are provided, and meanwhile good corrosion resistance is achieved. The hardness, the light transmittance, the scratch resistance and the electromagnetic shielding performance of the coated cover plate are improved.

An optical element includes a substrate made of a resin material and an antireflection film. The antireflection film consists of a dielectric layer formed on the substrate and a porous layer formed on the dielectric layer. The dielectric layer includes a first layer including silicon oxide and a second layer including tantalum oxide. The porous layer includes silicon oxide or magnesium fluoride.

The invention discloses a welding process for parts of a water storage tank of a liquid cooling system, suspension liquid is needed during welding, the suspension liquid is prepared from deionized water, citric acid monohydrate, nitric acid, hydrofluoric acid, precipitated barium sulfate micro powder, magnesium fluoride micro powder and composite corrosion inhibition dispersion premixed liquid, and the welding process comprises the steps that the parts of the water storage tank are tailor-welded and subjected to electrolytic polishing; argon is filled for closed welding; a suspension and a stainless steel grinding needle are injected into the cavity, and alternating magnetic force polishing is conducted; and discharging waste liquid, and performing high-pressure washing and neutralization. According to the method, a fluid physical network with yield stress is constructed, and a high-viscosity state is maintained in a static non-working area to shield and protect a base material; in a closed weld zone, a magnetic field drives a grinding needle to generate mechanical shearing force to shear and dilute fluid, targeted release of acid liquor softens oxide skin, physical stripping is completed by combining inorganic micro powder friction, and fixed-point removal of blind zone welding spots and synchronous protection of base metal in a non-working zone are achieved.

The invention discloses a dianion salt-based magnesium fuel cell electrolyte and a preparation method, and belongs to the technical field of magnesium fuel cells, the electrolyte is composed of dianion composite magnesium salt, propylene carbonate (PC), tetrahydrofuran (THF), magnesium fluoride (MgF) nanoparticles, 1, 3-dioxolane (DOL), diethylene glycol dimethyl ether (G2) and trimethyl phosphate (TMP) according to a specific mass percentage, and the dianion salt-based magnesium fuel cell electrolyte is prepared from dianion composite magnesium salt, propylene carbonate (PC), tetrahydrofuran (THF), magnesium fluoride (MgF) nanoparticles, 1, 3-dioxolane (DOL), diethylene glycol dimethyl ether (G2) and trimethyl phosphate (TMP) according to a specific mass percentage. The mass ratio is 1: (1.6-2.0). The preparation method comprises the four steps of composite salt preparation, solvent dehydration, salt dissolution and additive mixing, and the ionic conductivity and thermal stability of the electrolyte are improved through specific ultrasonic parameters, dehydration conditions and annealing treatment.

The invention relates to the technical field of anti-reflection tempered glass films, and discloses an infrared anti-reflection tempered glass film which comprises an AF layer, a hardening layer, an anti-reflection module, a silicon dioxide layer and a glass layer, and the AF layer, the hardening layer, the anti-reflection module, the silicon dioxide layer and the glass layer are sequentially arranged in a covering mode. The anti-reflection module is used for improving the transmittance of visible light and infrared light, the anti-reflection module comprises a silicon dioxide bottom film layer, multiple magnesium fluoride film layers and multiple germanium film layers, the silicon dioxide bottom film layer is arranged on the bottom layer, and the magnesium fluoride film layers and the germanium film layers are sequentially arranged in a staggered film covering mode. By adopting a multi-layer coating process, the refractive index of the tempered glass film is improved, the reflectivity is reduced, the transmittance of visible light and infrared light is improved, and the influence of the tempered glass film on the function of a screen infrared sensor or a laser radar is reduced when the function of the front infrared sensor or the infrared laser radar is used.

The utility model discloses a composite film structure with optical anti-reflection protection and electromagnetic shielding functions, and belongs to the technical field of optical anti-reflection films. The composite film is formed by alternating high-refractive-index conductive film layers and low-refractive-index film layers, the low-refractive-index film layers are subjected to graphical processing, the projection area of the low-refractive-index film layers is smaller than that of the high-refractive-index conductive film layers, and the multiple high-refractive-index conductive film layers are communicated outside the low-refractive-index film layers; the high-refractive-index conductive film layer is made of ITO, the low-refractive-index film layer is made of magnesium fluoride, and the materials have high hardness, so that the composite film can be used as a protective film, and the environmental endurance capacity of an optical device is improved; the ITO has the conductive characteristic, and the multiple pieces of ITO are communicated outside the low-refractive-index film layer, so that the ITO can serve as an electrode, and the composite film can serve as an electric heating film under the condition that an additional electrode is not needed; and the low-refractive-index film layer is subjected to graphical processing, so that the composite film also has an electromagnetic shielding function.

The invention relates to a magnesium fluoride gradient coated and doped positive electrode material, a preparation method thereof and a battery, the preparation method comprises the following steps: providing a ternary core, and activating the ternary core to obtain an activated core; magnesium is adsorbed to the activated inner core in a gradient mode through magnesium source steam, and a transition layer is formed; carrying out in-situ reaction on the magnesium adsorbed on the activated inner core by adopting ammonia source gas to generate a MgF2 coating layer; and performing annealing treatment to obtain the magnesium fluoride gradient coated and doped positive electrode material. According to the preparation method provided by the invention, the interface stability of the ternary positive electrode material under the high voltage of 4.3 V or above can be remarkably improved, the reduction reaction of nickel and the oxygenolysis of electrolyte can be effectively inhibited, and the corrosion of HF to the material is reduced; moreover, through gradient coating of MgF2, the interface impedance is prevented from being increased while the interface protection effect is guaranteed, the ionic conductivity and the cycle performance of the material are both considered, and the structural stability of the material is improved.

The invention discloses a magnesium fluoride modified hierarchical pore aluminosilicate composite adsorbent as well as a preparation method and application thereof, and relates to the technical field of gas separation and trapping materials. The composite adsorbent comprises a hierarchical pore channel aluminosilicate substrate and magnesium fluoride nanoparticles, the hierarchical pore channel aluminosilicate substrate is provided with micropores, mesopores and macropores which are communicated with one another, and the skeleton of the hierarchical pore channel aluminosilicate substrate contains alkali metal cations; the magnesium fluoride nanoparticles are anchored on the inner surface and the outer surface of the hierarchical porous aluminosilicate substrate in a chemical bonding manner, and are distributed at the inlets of the micropores and the inner walls of the mesopores. Magnesium fluoride nano-particles are anchored on the inner surface and the outer surface of the hierarchical porous aluminosilicate substrate through chemical bonding and are accurately distributed at the inlet of a micropore and the inner wall of a mesopore, so that excellent water vapor resistance is realized. The adsorbent is ingenious in structural design and excellent in comprehensive performance, and a reliable solution is provided for efficiently and stably capturing carbon dioxide in a real humid industrial flue gas environment.

The invention provides a negative electrode current collector, a preparation method thereof and an all-solid-state battery. The negative electrode current collector comprises a substrate layer, a first coating and a second coating which are sequentially stacked, the first coating comprises a composite material with a first metal and MXene carbide, and the second coating comprises a second compound; wherein the first metal comprises at least one of silver, gold, tin, zinc, lead or bismuth; the general formula of the MXene carbide is Mn + 1CnTx, M comprises at least one of titanium, vanadium, niobium, molybdenum, tantalum, chromium, zirconium, hafnium, scandium or tungsten, n is equal to 1-3, and Tx comprises at least one of-OH,-O or-F; the second compound comprises at least one of aluminum oxide, magnesium oxide, lithium fluoride, magnesium fluoride, calcium fluoride or boron nitride. The negative electrode current collector, the preparation method thereof and the all-solid-state battery provided by the invention are simple in structure, convenient to manufacture and high in stability, and can improve the battery performance and prolong the service life.

The invention relates to the technical field of batteries, in particular to a porous silicon carbon negative electrode material, a preparation method thereof, a negative electrode plate and a battery. The preparation method comprises the following steps: pretreating the photovoltaic solid waste; the micron silicon waste particles are obtained; mixing with magnesium powder to prepare a silicon-magnesium alloy at high temperature; reducing the silicon-magnesium alloy with carbon dioxide to obtain a carbon-coated Si / MgO / C composite material; pickling to remove magnesium oxide; meanwhile, villiaumite is added to form a magnesium fluoride deposition layer on the silicon surface; and performing high-temperature treatment in a tubular furnace in an inert atmosphere to obtain the porous silicon-carbon negative electrode material. According to the technical scheme, photovoltaic solid waste silicon serves as a silicon source, after CO2 is introduced into silicon-magnesium alloy (Mg2Si) and an MgO pore-forming template is removed through acid pickling, fluoride is introduced for surface in-situ treatment, and a stable interface layer with high electronic conductivity and high ionic conductivity is jointly constructed.