62results about How to "Coated evenly" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The utility model discloses a kind of fluidization disc and fluidization coating device, shape is conical, inside is equipped with cavity, including side wall and bottom wall, multiple first air passage, second air passage and third air passage are equipped on the side wall and the cavity is communicated, the first air passage, the second air passage and the third air passage are all around the center array distribution of fluidization disc, it is also equipped with the air inlet being communicated with the cavity;The first air passage is vertical through-hole, it is set adjacent to the center of fluidization disc, the third air passage is inclined through-hole towards the center axis of fluidization disc, the third air passage is set adjacent to the edge of fluidization disc, the second air passage is through slot, located between the first air passage and the third air passage, the second air passage is relatively inclined to set the radial of fluidization disc. It can be uniformly fluidized to powder, realize uniform coating, improve product quality.

The utility model relates to the technical field of gluing devices, and discloses a gluing device for antibacterial formaldehyde-removing wall cloth processing, which comprises a working box, a placing groove is formed in the working box, a third support frame is fixedly connected to one side, far away from a first support frame, of the top of the working box, and a motor is fixedly connected to the side wall of a second support frame. The output end of the motor is fixedly connected with a glue roller, the glue roller is rotationally connected to the inner wall of a second supporting frame, a scraping plate is arranged on the second supporting frame, scraping assemblies are arranged on the two sides of the top of the working box, and the scraping plate is used for scraping redundant glue on the glue roller; by simply rotating the screw and accurately adjusting the distance between the scraper and the rubber roller, the problems of waste caused by excessive glue, uneven surface of the wall cloth, glue seepage and the like are effectively avoided, the quality defects of unstable pasting, hollowing, edge warping and the like of the wall cloth caused by too little glue are effectively avoided, and the stable and reliable quality of the wall cloth is ensured.

The invention provides a composite material, a preparation method thereof and conductive slurry, and belongs to the technical field of conductive materials. The preparation method comprises the steps that a base material is pretreated, an activated base material is obtained, and the base material comprises copper powder or nickel powder; and an atomic layer deposition technology is adopted, a coating layer is deposited on the surface of the activated base material, the composite material is obtained, and the coating layer comprises a silver layer. The composite material prepared by the invention has the characteristics of uniform and compact coating, controllable thickness, strong interface bonding force, strong oxidation resistance, stable performance and the like, and the performance of the conductive slurry can be remarkably improved.

The application belongs to the technical field of all-solid-state lithium-sulfur battery materials, and relates to a lithium sulfide nano composite positive electrode material with high reaction kinetics and a preparation method and application thereof. The application aims to solve the deficiencies of the lithium sulfide positive electrode material in ion and electron conductivity, reduce the activation barrier of the lithium sulfide positive electrode material, improve the battery redox kinetics, and further improve the rate performance and cycle capacity of the battery. The lithium sulfide nano composite positive electrode material is prepared by using an in-situ synthesis method, the obtained composite material has rich metal atom crystals embedded in the lithium sulfide matrix, and a layer of amorphous carbon is uniformly coated on the surface. The finally obtained lithium sulfide nano composite positive electrode material exhibits high reversible capacity and excellent rate performance. The application has the characteristics of uniform coating and simple process, is suitable for large-scale production, and has a wide application prospect in the field of all-solid-state lithium-sulfur batteries.

This application relates to the field of solid waste resource utilization technology, specifically disclosing a method for synthesizing lithium iron phosphate based on sludge incineration ash through electrocoagulation-lithiation. The method involves leaching sludge incineration ash with dilute sulfuric acid to obtain a phosphate-containing acid leachate, followed by purification with a cation exchange resin to remove multivalent metal impurities. Using the purified phosphate solution as the base electrolyte, a lithium source, electrolyte, and organic carbon source are added, and the pH is adjusted. An iron plate is used as the anode and an inert electrode as the cathode for electrocoagulation. Fe²⁺ dissolved at the anode co-precipitates with PO₄³⁻ and Li⁺ in the solution to form a LiFePO₄ precursor slurry. Finally, solid-liquid separation, washing, drying, and programmed temperature sintering are performed to obtain a carbon-coated lithium iron phosphate composite material. This application has the advantage of achieving high-value utilization of sludge incineration ash.

The utility model relates to the technical field of carbon brush production, in particular to a carbon brush oiling tool which is provided with a horizontal moving unit, a vertical moving unit is arranged on the horizontal moving unit, an oiling unit is arranged on the vertical moving unit, the oiling unit comprises an oil pipe, an oil injection valve and an oiling brush, and an oiling position adjusting unit is arranged on the vertical moving unit. Through linkage control of the horizontal moving unit and the vertical moving unit, it is ensured that the oiling brush can be accurately positioned to the starting point of the carbon brush milling arc face, and continuous and uniform covering of an oil film is achieved through the constant-speed pulling-up action from bottom to top. The oil injection valve and the lifting speed are synchronously adjusted, the oil quantity and thickness can be accurately controlled, and the problem that an oil film is too thick or too thin in traditional manual operation is solved; the oiling position adjusting unit is integrated on the vertical moving unit, so that transverse deviation is supported, carbon brushes of different sizes and radians are adapted, missing coating or uneven coating caused by workpiece tolerance is avoided, and the process compatibility is remarkably improved.

The present application relates to the technical field of high polymer material flame-retardant modification, and particularly relates to a COF hierarchical modification APP-based core-shell flame-retardant smoke suppressant, a preparation method and application thereof. The flame-retardant smoke suppressant takes APP as a flame-retardant core layer; takes PVP as a soft template agent, and assists in situ growth of melamine-p-phenylenedimethylene formaldehyde (COF) on the surface of APP to adsorb combustible volatile components in the initial pyrolysis stage, provide a gas source, and act as a Fe 3+ coordination skeleton; takes tannic acid as a coordination agent and a carbon source, and constructs a multi-level core-shell structure with Fe 3+ coordination. The present application realizes integration of flame-retardant and smoke suppression functions through hierarchical modification. When the flame-retardant agent is applied to polyurethane, it can significantly reduce the heat release rate, smoke release rate and toxic gas generation amount, and simultaneously improve the compatibility with the matrix, effectively overcoming the defects of poor compatibility and insufficient flame-retardant and smoke suppression performance of traditional APP flame-retardant agents. The present application has simple preparation process and controllable conditions, and is suitable for industrial production.

This invention discloses a method for preparing a graphene / silicon-carbon composite anode material. The method includes: firstly, preparing a carbon-coated silicon dioxide precursor via a hydrothermal reaction; then, converting it into a carbon-coated silicon material using a magnesothermic reduction method in the presence of sodium chloride, effectively inhibiting the aggregation and growth of silicon particles; finally, combining graphene with the carbon-coated silicon material through a secondary hydrothermal and calcination treatment to construct a conductive network. This invention, through a multi-level structural design, utilizes the synergistic buffering effect of the internal carbon layer and the external graphene to effectively alleviate the volume expansion of silicon during charging and discharging, significantly improving the conductivity and structural stability of the material. The prepared composite anode material exhibits high specific capacity and excellent cycle performance, making it suitable for lithium-ion battery applications.

The application provides a lithium-rich lithium-iron material, a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium-rich lithium-iron material comprises a core and a coating layer coated on the surface of the core. The material of the core is lithium-rich lithium-iron doped with a first doping element, and the material of the coating layer is carbon material doped with a second doping element. The first doping element comprises at least one of Ti, W, Ni, Ce and Co, and the second doping element comprises at least one of B, N, S, O and P. The lithium-rich lithium-iron material is used as a lithium supplement in a battery, so that the capacity of the battery can be further improved and the gas production amount can be reduced.

This invention relates to the field of high-purity aluminum and aluminum alloy production technology, and particularly to a porous alumina ceramic material, its preparation method, and its application. The material comprises a composite aggregate and an organic binder, wherein the mass ratio of the composite aggregate to the organic binder is 47:3. The composite aggregate comprises 9 wt%–17 wt% inorganic binder and 83 wt%–91 wt% aggregate particles. The inorganic binder comprises: 40 wt%–50 wt% B₂O₃, 20 wt%–29 wt% Al₂O₃, 10 wt%–15 wt% SiO₂, 9.4 wt%–14.4 wt% MgO, 0–0.5 wt% Na₂O, 0–0.5 wt% K₂O, and 0–10 wt% Re₂O₃, where Re is a rare earth element. This method uses corundum or α-Al₂O₃ as a framework and rare earth composite oxides as an inorganic binder. A high-temperature reaction forms sintering necks between the aggregate particles, resulting in a porous alumina ceramic with a bimodal pore distribution. Two different pore sizes are distributed in situ on the surface of the skeleton particles and the sintered neck, achieving a dual-capture filtration effect for aluminum molten inclusions. This solves the problem that filters with large pore sizes cannot simultaneously filter small-grain-sized impurities.

The application discloses an alkali-resistant spherical silica slurry for packaging substrates and a preparation method thereof. The method comprises the following steps: firstly, compounding submicron spherical silica and micron spherical silica; secondly, wetly modifying the compounded spherical silica by using a silane coupling agent; thirdly, secondly modifying the wetly modified spherical silica by using a non-polar short-chain silane coupling agent; and finally, dispersing the modified spherical silica in an organic solvent, and obtaining the spherical silica slurry through grading. The spherical silica slurry prepared by the method has good stability, reasonable product particle size distribution, and uniform modifier coating, and has good alkali resistance, good fluidity and low melting viscosity when applied to packaging substrates.

The application belongs to the technical field of magnetic material preparation, and relates to an electromagnetic mixing device and a method for mixing magnetic material powder by using the same. The electromagnetic mixing device comprises, from top to bottom, a feeding assembly, an electromagnetic mixing assembly and a demagnetization and screening assembly which are sequentially connected. The feeding assembly comprises a feeding inlet and a feeding pipe which are connected in a top-down manner. The electromagnetic mixing assembly comprises a stirring chamber and an electromagnetic stirrer. The demagnetization and screening assembly comprises a vibrating screen, a coarse particle outlet, a discharge outlet and a vibrating motor. The electromagnetic mixing device and the electromagnetic mixing method can realize more uniform, rapid and efficient mixing of magnetic material powder.

The utility model relates to the field of power equipment fire safety technology discloses a kind of fireproof plugging device for transformer box cable inlet and outlet, comprising: fixed sleeve, be located at the cable inlet and outlet of transformer box, its two ends are respectively connected with extension sleeve, one of the extension sleeve is located inside transformer box, another extension sleeve is located outside transformer box;The utility model is through being provided with fixed sleeve, extension sleeve, annular airbag, liquid ring, connecting pipe, piston and detection part, realize the automatic plugging of transformer box cable inlet and outlet under high-temperature environment such as fire. Annular airbag is expanded by liquid pressure and is attached to cable outer wall, forms efficient fire-retardant seal.

The invention belongs to the technical field of new energy, and particularly relates to a coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing an acrylamide polymer and a metal coating agent, and performing spray drying to obtain a mixture; and S2, coating the surface of the lithium-rich manganese-based positive electrode material with the mixture, and sintering to obtain the coated lithium-rich manganese-based positive electrode material. The coated lithium-rich manganese-based positive electrode material provided by the invention has high capacity, high magnification and high cycle performance.

The invention relates to the technical field of expanded ammonium nitrate explosives, in particular to a preparation method of a high-free-flowing liquid-mixed expanded ammonium nitrate explosive, which comprises the following steps: adding porous granular ammonium nitrate accounting for 15-25% of the weight of a liquid-mixed ammonium nitrate base material into the liquid-mixed ammonium nitrate base material prepared after expanded crystallization; the preparation method of the porous granular ammonium nitrate comprises the following steps: preparing rice husk charcoal from rice husks in an inert atmosphere, dispersing the rice husk charcoal in ethanol, adding tetraethoxysilane, adjusting the pH value, and filtering, washing and drying after the reaction is completed to obtain a charcoal-silicon composite carrier; adding a nonionic surfactant and a silane coupling agent to pre-treat the ammonium nitrate feed liquid; adding a carbon-silicon composite carrier into the pretreated ammonium nitrate feed liquid, preserving heat, and uniformly stirring to obtain premixed liquid; and finally, carrying out spray drying to obtain the porous granular ammonium nitrate. The prepared expanded ammonium nitrate explosive has good free-running property and moisture absorption resistance, and is safe and reliable in explosion performance.

The application discloses a preparation method of an ultra-high voltage AC / DC unequal-diameter cable soft joint, mainly including two core steps of inner semi-conductive shielding layer recovery and main insulation layer recovery. In the inner semi-conductive shielding layer recovery process, the conductor connection area is first wrapped with a shielding tape, and then is heated and shaped by using an inner shielding variable-diameter mold; the transition slope of the inner cavity of the mold is accurately matched with the transition slope of the conductor welding part, so that the interface contact characteristics are optimized and effective strength compensation is realized. In the main insulation layer recovery process, the extrusion crosslinking process is accurately divided into four stages of starting and filling, transition and forming, stable production, ending and deceleration, and the extrusion speed, heating temperature and mold pressure of each stage are controlled accurately in sections. The smooth filling, uniform coating and dense forming of the insulation material in the variable-diameter mold cavity are ensured, and the thermal degradation and structure defects of the material are effectively inhibited.

The invention discloses a preparation method of a catalyst for producing hydrogen peroxide through oxygen deficiency tandem piezoelectric-mechanical redox, and the preparation process of the catalyst comprises the following steps: firstly, constructing a zinc oxide substrate with a litchi-shaped structure through a water-phase thermally-induced self-assembly reaction; then introducing oxygen defects with controllable content on the surface of zinc oxide by adopting a liquid-phase mediated chemical reduction mode; and finally, performing in-situ auto-polymerization on the surface of the defective zinc oxide to form a polydopamine coating, thereby obtaining the target catalyst. The catalyst can efficiently and highly selectively prepare hydrogen peroxide through ultrasonic excitation under the conditions of pure water and normal temperature, has the advantages of mild reaction conditions, high generation rate, good stability, environmental protection and the like, and is suitable for the application scene of distributed hydrogen peroxide in-situ preparation.

The utility model relates to packing carton processing technical field, especially a kind of packing carton anticorrosive coating device, including the bottom table of device main body, the fixed frame is installed in the top of bottom table, the fixed frame is fixedly connected with multiple fixed plates, the side of multiple fixed plates is all installed with the electric telescopic rod for the synchronous drive coating of paper box inside and outside, the movable end of electric telescopic rod is fixedly connected with support plate, the bottom of support plate is fixedly connected with round plate.The utility model is through the setting of multiple electric telescopic rod, so that device can be coated to the inside and outside of paper box simultaneously, the four edges of paper box are respectively placed between round brush and square brush, multiple electric telescopic rods are opened simultaneously by control switch, so that multiple round brushes are coated to the outside of paper box, the inside of paper box is coated by multiple square brushes, meanwhile, square brush can avoid inside corner coating uneven, ensure the coating effect of device, greatly improve coating efficiency.

The utility model relates to wall cloth production technical field, and disclose a kind of surface treatment device for fabric wall cloth processing, including mounting cover, the side surface of mounting cover is equipped with discharge port, the inside symmetry of mounting cover is equipped with two mounting plate. In the utility model, first guide roller, second guide roller and the sticky hair band wrapped outside thereof using isosceles triangle layout, form double-sided contact path. When wall cloth presents S shape and goes around, sticky hair band efficiently sticks to remove double-sided dust, and from the source, spray impurities are eliminated. Spring push pressure rod makes second guide roller always press wall cloth, material elastic deformation is compensated in time;First telescopic link adjusts the initial height of second guide roller by sliding block, and the reference tension of different thickness wall cloth is adapted;Rotary motor drives swing rod to adjust the inclination of third guide roller, and secondary tightening fine adjustment is carried out to pre-spraying section, and the three synergies ensure that wall cloth maintains constant tension in spraying channel, avoid uneven coating caused by wrinkle or slack.

This invention relates to the field of flame-retardant composite materials, specifically to flame-retardant composite materials based on the synergistic reinforcement of talc and graphene sheets and their applications. It addresses the problem that existing polymer materials struggle to simultaneously achieve reinforcement, flame retardancy, and lightweighting, and require large quantities of high-performance additives. The process involves first mixing talc sheets, graphene, a composite flame retardant, and a dispersant in a high-speed mixer, then cooling to room temperature to obtain a premix. A polymer matrix is ​​then added to a twin-screw extruder. The premix and other auxiliary additives are added through a side feed port, melt-blended, water-cooled, air-dried, and pelletized to obtain composite material particles. These particles are then vacuum-dried and injection-molded to obtain the flame-retardant composite material. The flame-retardant composite material possesses excellent flame-retardant and mechanical properties, exhibiting outstanding overall performance and being more suitable for industrial production.

The invention provides a high-dispersion high-rate polyanion sodium battery positive electrode material and a preparation method thereof, the positive electrode material comprises ferric sodium pyrophosphate and carbon, and meets one or more of the following conditions: (1) the positive electrode material exists in the form of primary single crystal particles; (2) the D50 of the positive electrode material is 0.5-2.5, and the D90 of the positive electrode material is 1-5; (3) the compaction density of the positive electrode material is 2.0-2.1 g / cm < 3 >; (4) the molecular formula of the ferric sodium pyrophosphate in the positive electrode material is Na4Fe3 (PO4) 2P2O7; and (5) the carbon content of the positive electrode material is 1.0-2.5 wt%. According to the preparation method, anhydrous iron-phosphorus compounds are adopted as precursors, and the interaction among particles is greatly weakened by virtue of weak interaction among the anhydrous iron-phosphorus compounds, synergistic particle size regulation and low-temperature sintering, so that primary small ferric sodium pyrophosphate particles which are regular in morphology and highly dispersed are prepared; and gaps caused by loose aggregation among the primary particles are eliminated, so that the prepared positive electrode material has relatively high compaction density.

This invention discloses a CNT composite negative electrode sheet for sulfide all-solid-state batteries and its preparation method, belonging to the field of all-solid-state battery technology. The negative electrode sheet includes a negative current collector and an active modification layer loaded on its surface. The active modification layer is composed of a binder, metal nanoparticles, a carbon conductive phase, and a CNT supporting phase. The mass ratio of metal nanoparticles, carbon conductive phase, and CNTs is (0.5–4):(5–7):(0.2–1), and the binder content accounts for 3 wt%–10 wt% of the dry weight of the modification layer. The preparation method employs a two-step ball milling method: first, the solvent and each powder are pre-mixed and ball-milled; then, a binder slurry is added and ball-milled a second time. The resulting slurry is coated onto the surface of the current collector and dried to obtain the electrode sheet. This invention constructs a three-dimensional network structure using CNTs, enhancing the mechanical strength of the modification layer and inducing uniform lithium deposition, effectively suppressing lithium dendrite growth. This technology is simple, provides uniform dispersion, and can significantly improve the cycle stability and safety performance of sulfide all-solid-state batteries, making it suitable for high-energy-density energy storage scenarios.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries, the preparation method comprises the following steps: mixing an iron source, a lithium source, a phosphorus source, a dopant and a grinding agent, and carrying out dry ball milling to obtain precursor powder; and sintering the precursor powder under the protection of inert gas to obtain the lithium iron phosphate positive electrode material. According to the method, high-purity graphite / acetylene black is used as a grinding agent and a carbon source, a doping agent is added at the same time, a solvent does not need to be used, a ball-milled material does not need to be dried, uniform compounding of a precursor and construction of a conductive network are achieved in one step through the mechanochemical effect, and then the conductive network is obtained through high-temperature sintering. The prepared lithium iron phosphate positive electrode material has excellent electrochemical performance and relatively high compaction density, and still keeps relatively good electrochemical performance in a low-temperature environment, so that a new development direction is provided for production of lithium iron phosphate.

The invention belongs to the technical field of inorganic nonmetallic mineral fillers, and provides starch modified barium sulfate slurry as well as a preparation method and application thereof. The preparation method of the starch modified barium sulfate slurry comprises the following steps: modifying preheated barium sulfate powder with a silane coupling agent solution to obtain modified barium sulfate; mixing starch with water, and gelatinizing to obtain starch liquid; and mixing the starch liquid with the modified barium sulfate, and carrying out microwave treatment to obtain the starch modified barium sulfate slurry. The barium sulfate is an inorganic mineral and has poor affinity with organic plant fibers, and barium sulfate particles significantly improve the retention rate of the filler and the distribution uniformity of the filler in paper sheets through the binding force of starch and fibers, thereby finally achieving the purposes of improving the paper quality and reducing the production cost.

The invention discloses unsaturated polyester resin prepreg and a preparation method thereof, and relates to the technical field of polyester resin. The preparation method comprises the following steps: stirring an acid raw material and an alcohol raw material under the action of a catalyst to react to obtain an unsaturated polyester resin matrix; adding a cross-linking monomer, a curing agent and a coupling agent, melting and stirring to obtain a resin composition; the preparation method comprises the following steps: carrying out hot-melt impregnation on a resin composition and reinforced fibers to obtain impregnated fibers, and further drawing, cooling, sizing and cutting to obtain the unsaturated polyester resin prepreg. The unsaturated polyester resin prepreg and the preparation method thereof get rid of the dependence of traditional resin on a cross-linking agent, realize tight combination of reinforced fibers and the resin, and effectively reduce the defects of layering, debonding and the like.

This invention relates to a pretreated reinforced recycled aggregate concrete and its preparation method, comprising the following raw materials: 320-360 parts cement; 20-40 parts fly ash; 80-120 parts mineral powder; 585-670 parts manufactured sand; 1050-1200 parts recycled coarse aggregate; 156-172 parts water; and 11-12.3 parts admixtures. After pretreatment, the concrete prepared from the recycled coarse aggregate exhibits significantly improved performance compared to the untreated recycled coarse aggregate. The synergistic effect of multiple pretreatment methods significantly improves the water absorption, crushing index, and apparent density of the raw coarse aggregate. Pretreatment of the recycled coarse aggregate provides enhanced conditions for internal hydration in the recycled concrete and simultaneously improves the surface roughness of the recycled coarse aggregate, thus enhancing the workability and increasing the strength of the concrete.

This invention provides a method for preparing low-melting-point rare-earth alloys to improve the coercivity and mechanical properties of cerium-containing sintered NdFeB permanent magnets. The method includes: rotary crushing of low-melting-point rare-earth alloy strips to obtain coarse low-melting-point rare-earth alloy particles; rotary crushing of a matrix alloy casting to obtain coarse matrix alloy particles; mixing the coarse low-melting-point rare-earth alloy particles and the coarse matrix alloy particles, followed by hydrogen crushing and then air jet milling to obtain low-melting-point magnetic powder; orienting and shaping the low-melting-point magnetic powder and then performing isostatic pressing to obtain a billet; sintering and heat-treating the billet to obtain a cerium-containing sintered NdFeB permanent magnet. This invention utilizes melt rapid quenching to prepare low-melting-point rare-earth alloy strips, employs rotary crushing to produce fine coarse particles, and adds these particles during hydrogen crushing to ensure better and more uniform mixing with the matrix alloy, thus meeting the needs of large-scale industrial production.

This invention relates to a method for modifying waste graphite materials, the resulting modified graphite materials, and their applications. The method includes the following steps: (1) mixing a transition metal compound and a carbon material with a solvent to obtain a composite interface layer precursor; (2) adding purified graphite to the composite interface layer precursor obtained in step (1) for surface coating, heating, and forming a gel; (3) subjecting the gel obtained in step (2) to drying, grinding, and heat treatment sequentially to obtain a modified graphite material; the carbon material includes phenolic resin. This invention uses a sol-gel method for coating. The composite interface layer coated recycled graphite anode material is based on carbon coating, with the addition of transition metal oxides, and is uniformly dispersed on the particle surface by the sol-gel method. This preparation method is simple and safe, and the modified graphite material obtained has high and stable capacity performance as an anode material for lithium-ion batteries.

This invention discloses a method for preparing a three-phase composite material of perovskite, carbon, and alloy particles, and its application in water electrolysis. The method allows for the in-situ growth of 10-20 nm alloy particles on the surface of perovskite, and the coating of the perovskite and alloy particles with a carbon-nitrogen shell. The perovskite has a size of 100-200 nm, and the carbon-nitrogen shell has a thickness of approximately 10 nm, which is adjustable. In this invention, perovskite material is distributed in a dopamine salt solution. Under alkaline conditions, the dopamine salt polymerizes on the perovskite surface to form a polydopamine coating. After drying, it is calcined under an inert atmosphere to form a carbon-nitrogen shell structure. The metal sites in the perovskite and the alloy particles act as active sites, catalyzing the oxygen evolution reaction. The sufficiently small size of the surface-deposited alloy particles provides more active sites, promoting improved catalytic activity. The carbon-nitrogen shell increases the conductivity of the material, further enhancing its electrocatalytic activity.