313 results about "Slurry coating" patented technology

The invention discloses an integrated preparation method of a SiC-based composite material environment barrier coating in the technical field of aviation thermal structure materials, which comprises the following steps: cleaning a substrate, carrying out vacuum impregnation of phenolic resin and curing, coating Si slurry to form a bonding layer, coating rare earth silicate slurry to form a barrier layer, and drying to obtain the SiC-based composite material environment barrier coating. And finally carrying out high-temperature heat treatment in an inert atmosphere. According to the method, through an integrated slurry coating and gradient curing process, the performance of a base body is protected, and meanwhile efficient preparation of the coating is achieved; by adopting an integrated slurry coating and gradient curing technology and combining with an optimized medium-temperature sintering process, the matrix performance is effectively protected while the compactness of the coating is ensured, the bonding strength and interface stability of the coating are improved through the design of the phenolic resin transition layer and the silicon bonding layer in cooperation with the rare earth silicate barrier layer, and the bonding strength of the coating is improved. And the coating shows excellent protection performance in a high-temperature corrosion environment.

The invention discloses a microporous diaphragm for a low-electrical-impedance lithium battery and a preparation method of the microporous diaphragm. The diaphragm comprises: a base film layer, wherein the base film layer is of a microporous structure formed by biaxially stretching polypropylene and / or polyethylene; the surface of the base film layer is coated with the functional coating, and the functional coating contains mixed slurry of inorganic nanoparticles and a binder; the surface modification layer is formed by introducing a hydrophilic electrolyte group on the surface of the functional coating through plasma treatment or chemical grafting. The base membrane layer forms a uniform micropore structure through a two-way stretching process, the functional coating is formed by compounding nano silicon dioxide or aluminum oxide and polyvinylidene fluoride according to a specific proportion, a porous layer with gradient pore diameter is formed, the pore size of the porous layer is smaller than that of the base membrane layer, and efficient permeation of electrolyte is ensured. Electrolyte-philic groups such as sulfonic groups are introduced into the surface modification layer, so that the wettability of the diaphragm to an electrolyte is remarkably improved. During preparation, the base membrane is formed through melt blending, two-way stretching and pore-forming agent extraction, and then the functional layer is constructed through slurry coating and a low-temperature plasma treatment or sulfonation process. The diaphragm combines gradient aperture design, inorganic filler enhancement and surface chemical modification, and realizes low impedance, high thermal stability and excellent mechanical strength.

The invention relates to the field of batteries, in particular to a long-circulation persistent adhesion type negative electrode composite electrode and a preparation method and application thereof. The long-circulation persistent adhesive type negative electrode composite electrode comprises a current collector, and a first adhesive layer, an active slurry coating and a second adhesive layer which are sequentially coated on two sides of the current collector, according to the invention, through the bonding effect between the second bonding layer and the diaphragm, the pole piece is uniformly stressed during cyclic expansion, the wrinkles of the pole piece are improved, the electrolyte infiltration is better in combination with the oil-absorbing conductive agent, the lithium ion transmission efficiency is improved, and the cycle life is prolonged; an interface structure formed by multi-layer coating can buffer lithium ion intercalation / deintercalation stress, so that the pole piece can still keep good binding power after circulation, and the cycle performance of the lithium ion battery can be effectively improved; the conductive agent contents of the first bonding layer, the active slurry coating and the second bonding layer are distributed in a concave gradient manner, so that the resistance is reduced, and the conductivity is enhanced.

The invention relates to the technical field of lithium ion batteries, in particular to a full-tab cylindrical lithium ion battery and a power utilization device, the full-tab cylindrical lithium ion battery comprises a winding type battery cell, and a positive plate, a diaphragm and a negative plate which are laminated according to a specific mode; the positive plate comprises a positive current collector as well as a positive slurry coating area and a positive empty foil area which are positioned on at least one surface of the positive current collector; the negative plate comprises a negative current collector as well as a negative slurry coating area and a negative empty foil area which are positioned on at least one surface of the negative current collector; after winding, the positive empty foil area and the negative empty foil area respectively form a positive tab and a negative tab through a kneading, cutting and stacking or ultrasonic process; when the battery discharges at 10C, the slope of a curve relation formed by data fitting of the temperature rise coefficient and the discharge current is 0.2-1, the temperature rise performance of the full-tab battery cell is obviously superior to that of a traditional tab battery, more electric quantity can be discharged in a lower temperature interval, and the full-tab battery cell has relatively good safety and relatively high energy density.

The invention relates to the technical field of investment mold shell casting, in particular to an investment mold shell casting system which comprises a rack, a slurry barrel, a roasting furnace, a cooling barrel and a slag collecting barrel are sequentially installed on the rack in the clockwise direction, and multiple sets of regularly-distributed elastic striking rods are installed on the inner wall of the slag collecting barrel. A loading and unloading station is arranged at the position, corresponding to the position between the slurry barrel and the slag collecting barrel, of the machine frame, a casting frame is installed on the machine frame in a liftable mode, a transmission unit is arranged on the casting frame, and the transmission unit is in transmission connection with a rotating station frame capable of periodically rotating by 72 degrees and a rotatable transmission gear ring. The casting equipment has the beneficial effects that casting links such as ceramic slurry coating, roasting, cooling and slag collecting are integrated into the same equipment, and the orderly circulation of a parison among the links is realized through the slurry barrel, the roasting furnace, the cooling barrel and the slag collecting barrel which are sequentially arranged on the rack in the clockwise direction and the rotary station frame capable of periodically rotating.

The utility model belongs to the technical field of electrode printing, and discloses a full-opening steel plate for printing and printing equipment. The full-opening steel plate for printing comprises a first metal layer and a second metal layer, and the first metal layer is provided with a printing opening in the first direction; the second metal layer is stacked on one side of the first metal layer, a slurry penetrating opening is formed in the second metal layer in the first direction and penetrates from the slurry coating face to the printing opening, a plurality of connecting parts are arranged in the slurry penetrating opening at intervals in the first direction, the connecting parts are partially hollowed out, and the connecting parts and the first metal layer are arranged at intervals; and a slurry storage cavity is formed between the connecting part and the first metal layer. According to the full-opening steel plate for printing, the locally-hollowed-out connecting part and the slurry storage cavity are used for storing slurry together, so that sufficient slurry is supplied to the printing opening, the situation that gaps are generated in the positions, corresponding to the connecting part, of the fine grids due to insufficient slurry supply is prevented, the printing height of the welding area is effectively controlled, and the printing quality of a battery piece is improved.

The utility model provides a coating system for lithium battery slurry. The lithium battery slurry coating system comprises a slurry storage part, a slurry temporary storage part, a coating die head and at least one power component, the lithium battery slurry coating system further comprises a material conveying pipeline, a material supplementing pipeline and a material mixing pipeline. The lithium battery slurry coating system has a material supplementing state in which the slurry storage part conveys the slurry to the slurry buffer part through the material supplementing pipeline, a coating state in which the slurry buffer part conveys the slurry to the coating die head through the material conveying pipeline, and a material mixing state in which the slurry circularly flows in the slurry storage part, the material supplementing pipeline, the slurry buffer part, the material mixing pipeline and the slurry storage part in sequence. According to the technical scheme provided by the utility model, the problem in the prior art that the coating system for the lithium battery slurry is relatively long in coating and coating adjustment time is solved.

The invention discloses an optical paste film and a preparation method thereof, and relates to the technical field of optical functional materials. The optical slurry film is prepared by taking a polyethylene glycol terephthalate film as a base material and coating an optical slurry coating, the optical slurry coating is prepared from the following raw materials in parts by weight: 12 to 16 parts of nano silicon dioxide, 22 to 28 parts of acetone and butanone mixed solvent, 7 to 9 parts of modified titanium dioxide, 4 to 6 parts of nano zirconium oxide, 30 to 35 parts of modified epoxy resin, 18 to 22 parts of butyl acrylate, 4 to 6 parts of dioctyl sebacate, 2.5 to 3.5 parts of silane coupling agent KH-570, 1 to 1.5 parts of organic silicon flatting agent and 0.6 to 1 part of organic silicon defoaming agent. 1.2-1.8 parts of an antioxidant 1010, 3-4 parts of a photoinitiator 184 and 6-8 parts of bis (4-tert-butylphenyl) iodine hexafluorophosphate; the polyethylene glycol terephthalate film pretreatment material comprises absolute ethyl alcohol and deionized water. The raw materials are scientifically proportioned, the titanium dioxide and the epoxy resin are clearly modified, the preparation process is complete, and the finished product is high in light transmittance, good in weather resistance, adaptive to the requirements of the optical field and high in practicability.

The invention relates to the technical field of solar cells, in particular to a preparation method for fission of a line mark substrate into a multi-stage control tower nanometer suede, which comprises the following steps of: S1, processing a silicon wafer to obtain a double-sided polished flat surface; s2, forming an oxide layer on the polished surface; s3, impurity removal treatment; and S4, small suede etching is carried out after the nano mask particles are attached. According to the invention, the non-trace substrate is realized, the silicon oxide layer is formed on the silicon by spraying ozone, and the problem of non-uniform phosphorus slurry coating of the double-sided polished silicon wafer is solved.

The invention provides a composite electrode pole piece and a preparation method and application thereof, and the preparation method comprises the following steps: coating the surface of at least one side of a current collector with electrode slurry to obtain an electrode slurry coating, and coating the surface of the electrode slurry coating with solid electrolyte slurry when the electrode slurry coating is not dry to obtain the composite electrode pole piece. And then drying and rolling to obtain the composite electrode plate. According to the preparation method, after the electrode slurry is coated, the solid electrolyte slurry is coated when the electrode slurry is not dry, and the solid electrolyte layer is obtained on the surface of the electrode coating, so that the problem of internal interface contact of the electrode plate is solved, the problem of external interface contact of the electrode plate is also solved, the impedance of the solid-state battery is reduced, and the service life of the solid-state battery is prolonged. And the rate and the cycle performance of the solid-state battery are improved.

The invention discloses a solid-waste-based expansive type recycled aggregate interface enhancer as well as a slurry coating method and application thereof, belongs to the technical field of aggregate reinforcement and regeneration, and aims at solving the technical problem that the strength of recycled aggregate and the performance of prepared concrete need to be further improved in the prior art. The dry matrix powder is prepared from the following components in parts by weight: 42 to 47 parts of ardealite, 50 to 55 parts of blast furnace slag powder, 3 to 5 parts of silicon powder and 1.8 to 2.2 parts of carbide slag. The recycled aggregate is subjected to interface reinforcement regeneration by optimizing the composition of the interface reinforcer and a slurry coating method, so that the comprehensive performance of the recycled aggregate is effectively improved, the strength and the fluidity of a concrete sample are effectively improved when the recycled aggregate is applied to concrete processing, and the method is low in production cost and suitable for industrial production. And the method has the advantages of cost and environmental protection when being used for treating a large batch of recycled aggregates.

The embodiment of the invention provides equipment and a method for preparing a silver-carbon negative electrode plate, the silver-carbon negative electrode plate and a solid-state battery. The preparation equipment of the silver-carbon negative electrode plate comprises an unwinding device, a negative electrode slurry coating device, a spraying device and a first drying oven. Wherein the unwinding device is used for conveying a negative electrode current collector to the negative electrode slurry coating device. The negative electrode slurry coating device is used for coating the surfaces of the two sides of the negative electrode current collector with negative electrode slurry containing carbon elements and drying the negative electrode slurry to obtain an intermediate pole piece; and the spraying device is used for spraying a silver-containing solution on the surfaces of the two sides of the middle pole piece to obtain a negative pole roll. And the first drying oven is used for drying the negative electrode roll to obtain the silver-carbon negative electrode plate. The silver-carbon negative electrode plate prepared by the preparation equipment is relatively low in energy consumption and cost and relatively high in efficiency.

The application discloses a kind of lithium battery water system negative electrode coating drying system, including tunnel type oven box, spraying device, adjustable air nozzle and detection device, tunnel type oven box left and right sides are respectively symmetrically opened with feed inlet and discharge port, water system negative electrode is driven and set between feed inlet and discharge port, two groups of mounting plates are fixedly installed in the inside of tunnel type oven box on the upper and lower sides of water system negative electrode, a plurality of air inlets are equidistantly opened on two groups of mounting plates, adjustable air nozzle is installed in the outside of each air inlet, detection device includes at least four groups of temperature and humidity sensors, temperature and humidity sensors are installed between adjustable air nozzle at intervals, spraying device is installed on the upper and lower places of tunnel type oven box at feed inlet place.The advantage of the present application is that water can be sprayed on the surface of the foil of the water system negative electrode before slurry coating, which replaces the slurry through the oven first to increase the humidity in the tunnel type oven, so that the humidity and temperature in the oven quickly reach the working state, avoiding the subsequent dry cracking.

The utility model relates to the technical field of slurry coating, and discloses a slurry feeding device and a coating machine, the slurry feeding device comprises a material tank, a delivery pump, a control valve and a first pressure sensor; a material storage cavity is formed in the material tank, an air inlet is formed in the material tank, the conveying pump is connected with the material tank and used for pumping slurry in the material storage cavity outwards, a discharging opening is formed in the conveying pump, and the first pressure sensor is arranged at the discharging opening and used for detecting the discharging pressure at the discharging opening; the control valve is located outside the material tank and connected with the air inlet, the control valve is in signal connection with the first pressure sensor, and the control valve is used for controlling the flow of external air entering the material storage cavity according to the discharging pressure value detected by the first pressure sensor; the slurry feeding device mainly solves the technical problem that in the prior art, due to the fact that the air pressure in the material tank is unstable, the slurry discharging pressure is unstable.

The invention discloses a battery pole piece, a preparation method thereof and an all-solid-state lithium ion battery. The battery pole piece comprises a current collector and positive electrode slurry coatings coated on two sides of the current collector, and a solid electrolyte membrane which is cured through in-situ printing based on a 3D printing technology is arranged in the middle of the positive electrode slurry coatings. Insulating ceramic adhesive coatings which are cured through in-situ printing based on a 3D printing technology are arranged on the areas, close to the peripheral edge, of the positive electrode slurry coating and the areas, close to the positive electrode slurry coating, of the two sides of the tab. According to the battery pole piece formed through 3D printing, the short-circuit rate of an all-solid-state lithium ion battery can be effectively reduced, and the energy density and the rate capability of the all-solid-state lithium ion battery can be improved; the problem of short circuit or insulation reduction caused by the ultrathin solid electrolyte and burrs on the edge of the pole piece can be prevented, and the consistency, the stability and the safety of the battery are improved.

A high-compaction-resistant nano carbon-coated aluminum current collector, relating to the technical field of current collectors of batteries.The nano carbon-coated aluminum current collector comprises an aluminum current collector and mesh-shaped conductive layers respectively coated on the upper and lower surfaces of the aluminum current collector, wherein the mesh-shaped conductive layers each are formed by slurry coating and baking, and a slurry comprises a conductive material, a binder, nanocellulose, a cross-linking agent, a solvent, and a wetting agent. Through the design of a slurry formulation and an aluminum current collector coating, a layer of mesh-shaped structure is formed in a nano conductive coating, such that the effect of conductive particles on pinholes of an aluminum current collector is reduced, and a nano carbon-coated aluminum current collector can withstand higher compaction density of active materials, thereby reducing the frequency of aluminum foil breakage, improving the energy density of a battery.

The invention provides a titanium-based catalytic anode for water electrolysis hydrogen production and a preparation method thereof.The titanium-based catalytic anode comprises a titanium substrate and a catalytic layer covering the surface of the titanium substrate, and the catalytic layer is a slurry coating formed by mixing cerium-zirconium solid solution powder and a noble metal catalyst; or the catalyst layer is formed by depositing a cerium-zirconium solid solution loaded with a noble metal catalyst on the surface of the titanium substrate. The cerium-zirconium solid solution has high catalytic activity, can provide abundant defect sites and active sites, and is beneficial to the generation of catalytic reaction; and the cerium-zirconium solid solution can also optimize the surface property of the noble metal catalyst and improve the adsorption and conversion efficiency of reactants, so that the catalytic performance of the titanium-based catalytic anode is remarkably improved.

The invention discloses an electric arc additive manufacturing method of a TaC particle reinforced TC4 titanium-based composite material and application of the electric arc additive manufacturing method, and belongs to the technical field of metal-based composite material additive manufacturing. According to the method, TC4 titanium alloy serves as a base body, TaC particles serve as a reinforcement phase, interlayer slurry coating and a cold metal transition electric arc additive process are combined, and uniform dispersion and effective reinforcement of the TaC particles in the base body are achieved through accurate raw material proportioning, slurry system optimization and process parameter regulation and control. When the adding amount of TaC is 5 wt.%, the tensile strength of the composite material reaches 1024 MPa, the ductility is 8.2%, the average hardness is 351 HV0.5, the wear rate is 27.3 mg / g, and the comprehensive mechanical performance is optimal; when the addition amount is 7.5 wt.%, the average hardness is improved to 386 HV0.5, the wear rate is reduced to 20.7 mg / g, but the tensile property is reduced, so that the high-wear-resistance composite material is more suitable for high-wear-resistance scenes. The problems of TaC particle agglomeration, poor interface bonding and unbalanced toughness are solved, the process is simple, convenient and efficient, the cost is controllable, and the method is suitable for large-scale manufacturing of high-performance structural parts in the fields of aerospace, national defense equipment and the like.

This utility model discloses a device for preparing a gas diffusion electrode, comprising: a bottom support plate and a diffusion electrode carrier limiting groove, wherein the diffusion electrode carrier limiting groove is disposed on the upper end of the bottom support plate; and a roller baffle disposed on the outer side of the upper end of the bottom support plate. This device for preparing a gas diffusion electrode uses a handle to move the front and rear slurry coating rollers on the roller movement track groove, making the coating process more controllable. Different specifications of the structure can be selected according to usage needs, facilitating large-scale use. By pulling the movement of the front and rear slurry coating rollers and connecting the pump connecting hose to the slurry output connector, controllable and uniform preparation of the electrode catalyst is achieved, providing a simple and effective method and equipment for large-scale mass production.

The invention belongs to the technical field of battery composite materials, and provides a carbon fiber positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that 1, a positive electrode active material, a conductive agent, a binder and a solvent are mixed to obtain positive electrode slurry; or; mixing the positive electrode active material, a conductive agent, a binder, a dispersant and a solvent to obtain positive electrode slurry; (2) mixing carbon fibers and the positive electrode slurry to obtain intermediate carbon fibers; and (3) carrying out post-treatment on the intermediate carbon fiber to obtain the carbon fiber positive electrode material. The invention provides an innovative technical route, a positive electrode material is directly integrated into a carbon fiber matrix by optimizing a positive electrode active material, a conductive agent and binder system and a slurry coating and curing process, and a multifunctional carbon fiber composite structure capable of simultaneously carrying and storing energy is obtained.

The utility model belongs to the technical field of dryers, and discloses a dryer for a conductive slurry coating, which comprises a case as well as a fan assembly, a heating net, a placement frame and a flow guide assembly which are sequentially arranged in the case from bottom to top, the upper ends and the lower ends of the two partition plates do not make contact with the upper end and the lower end of the machine box, circulating channels are formed between the two partition plates and the machine box, the flow guide assembly comprises two flow guide plates symmetrically connected to the inner sides of the two partition plates in a sliding mode, and flow guide grooves are formed in the bottoms of the two flow guide plates. And the flow guide directions of the two flow guide grooves are inclined downwards. According to the utility model, hot air steers along the diversion trench at the bottom of the diversion trench through the diversion plate, so that the bottom surface, the top and the side surfaces of a workpiece can be dried by hot air, each surface of the workpiece is dried by hot air through a single fan, and the drying efficiency is improved.

The application discloses a shell slurry performance online quantitative evaluation system and method based on wax mold surface modification, and the system comprises a multi-state wetting wax mold preparation module, an automatic coating and multi-parameter rheological observation module and a precise wax residue analysis module which are sequentially connected and cooperatively work; the multi-state wetting wax mold preparation module selectively manufactures patterned areas with different hydrophilic and hydrophobic characteristics including hydrophilic, hydrophobic and super-hydrophobic on the surface of a standard test wax mold by controlling ultraviolet laser processing parameters; the automatic coating and multi-parameter rheological observation module is used for automatically completing slurry coating and quantifying the leveling behavior of the slurry based on machine vision; the precise wax residue analysis module adopts laser-induced breakdown spectroscopy technology and is used for quantitatively detecting the wax residue on the inner surface of the shell after dewaxing. The application also discloses an online quantitative evaluation method, which can provide direct and reliable data support for optimizing the slurry formula and the shell preparation process, thereby realizing automatic, high-precision and low-cost online quality control and reducing the casting scrap rate from the source.

The present invention relates to a low-metal antenna and its design method. A carbon powder slurry is applied to the surface of an antenna element to form a carbon powder slurry coating. The antenna element is a semiconductor radiating element. The disclosed antenna proposes a typical alternative material for manufacturing radar antennas, which can reduce the metal content of the radar antenna in a composite mine detector system, thereby effectively reducing the radar antenna's impact on the primary field of the electromagnetic induction module, improving system sensitivity and dynamic range, and achieving beneficial effects in electrical performance, quality, and cost.

The invention discloses a low-fat flour-coated minced fillet product suitable for air fryer heating and a processing method thereof.The processing method comprises the following steps of minced fillet unfreezing, minced fillet chopping, mixing and seasoning, shaping, water retention and brittleness increasing treatment, flour coating, slurry coating, freezing and packaging.The low-fat flour-coated minced fillet product suitable for air fryer heating and the processing method thereof are low in oil content and free of peculiar smell, and the processing method of the low-fat flour-coated minced fillet product suitable for air fryer heating is suitable for air fryer heating. The product has distinct taste gradation, is convenient and fast to eat, and has a good application prospect.

The present invention provides a method for coating a safety layer slurry on a battery positive electrode sheet and a battery positive electrode sheet. The method for coating a safety layer slurry on a battery positive electrode sheet includes preparing a safety layer slurry, extrusion coating, and baking. The safety layer slurry preparation comprises uniformly mixing a safety solute and a binder, gradually adding a solvent in two or more portions and stirring at high and low speeds to achieve a solution with a solid content of 3-8% and a viscosity of 50-200 cP. The extrusion coating utilizes a multi-layer extrusion die, wherein an active material layer slurry is coated between a foil to be coated and the safety layer slurry, the distance between the coating die and the active material layer is 50-130 μm, and the thickness of a gasket at the safety layer slurry outlet is 0.1-0.3 mm. The present invention improves the solid content and viscosity of the safety layer slurry, the coating die gap, and the thickness of the gasket, so that the safety layer coated by this method can have a thin thickness and good safety without affecting the energy density of the electrode sheet.

The application provides a coating die, comprising a discharge cavity, the discharge cavity having a first inlet and a second inlet arranged oppositely, and a discharge outlet; the feeding direction of the discharge cavity and the discharging direction have an included angle; the slurry leaves the coating die from the discharge outlet. Wherein, the feeding direction is the direction of the slurry flowing into the discharge cavity from the first inlet and the second inlet; the discharging direction is the direction of the slurry flowing out from the discharge outlet. In the above technical solution, since the first inlet and the second inlet are arranged oppositely, and the feeding direction and the discharging direction have an included angle, the slurry entering from the first inlet and the second inlet will meet and collide to offset part of the kinetic energy, and then turn to leave the die from the discharge outlet. Since the kinetic energy of the slurry is consumed inside the die, the impact on the proton membrane is smaller during the process of the slurry coating on the surface of the proton membrane, and the thickness unevenness of the coated slurry on the length of the discharge outlet can be effectively reduced.

The electrode slurry coating system of the present invention comprises: a supply duct as a transport path for transporting an electrode slurry from a supply tank to a coating mold; a mass flow meter installed on a path of the supply pipe for measuring a flow rate of the electrode slurry conveyed through the supply pipe and a density of the electrode slurry; and a control unit for calculating a load amount prediction value of the electrode slurry based on measurement information measured by the mass flow meter and for controlling the calculated load amount prediction value of the electrode slurry to satisfy the load amount management range.

This utility model discloses a PCCP pipe winding and slurry impregnation device, belonging to the field of PCCP pipe production technology. It includes a tank, a stirrer, and a slurry coating rack. An opening is provided at the top of the tank, and the stirrer is installed at the bottom. The slurry coating rack is mounted on the tank and has several pulley sets, each including at least one pulley. At least one pulley set is located at the bottom of the tank. The winding wire passes through several pulleys and is wound onto the rotating PCCP pipe wall through the opening. This invention solves the technical problems of uneven slurry application on the steel wire surface, high labor costs, and high energy consumption in the traditional winding and slurry coating process, which relies on manual spraying using a mud pump.

The electrode slurry coating system according to the present invention includes a supply pipe that serves as a transfer path for electrode slurry from a supply tank to a coating die, a mass flow meter installed on the route of the supply pipe to measure the flow rate and density of the electrode slurry transferred through the supply pipe, and a control unit that calculates a predicted loading amount of electrode slurry based on measurement information measured by the mass flow meter and controls the calculated predicted loading amount of electrode slurry to satisfy a loading amount management range.

This invention provides a method for preparing a zinc anode protective coating based on a dual-gradient zinc-affinity-conductivity structure. First, polymer-derived carbon fibers and silver-coated carbon fibers are prepared, and silver-coated carbon fiber slurries and polymer-derived carbon fiber slurries are formed respectively. These are then sequentially coated onto a zinc sheet using a stepwise slurry coating method to obtain a CF / Ag-CF@Zn electrode. This CF / Ag-CF@Zn electrode forms a dual-gradient protective coating with a top layer of polymer-derived carbon fibers and a bottom layer of silver-coated carbon fibers. By relying on the inherent zinc affinity-conductivity difference of the materials, it can directionally guide the internal ion-electron flow to achieve a safe bottom zinc deposition mode, thereby avoiding unfavorable top zinc dendrite growth. This achieves a highly reversible and stable zinc anode, providing a more competitive approach for rationally designing zinc anode coatings to construct ultra-stable aqueous zinc batteries.