CN112517335A - Freezing coating equipment and manufacturing method of electrode - Google Patents

Freezing coating equipment and manufacturing method of electrode Download PDF

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Publication number
CN112517335A
CN112517335A CN202011346096.9A CN202011346096A CN112517335A CN 112517335 A CN112517335 A CN 112517335A CN 202011346096 A CN202011346096 A CN 202011346096A CN 112517335 A CN112517335 A CN 112517335A
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electrode
coating
freezing
freeze
push rod
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黄淳
郭勇明
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Shanghai Advanced Research Institute of CAS
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Shanghai Advanced Research Institute of CAS
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Priority to CN202011346096.9A priority Critical patent/CN112517335A/en
Publication of CN112517335A publication Critical patent/CN112517335A/en
Priority to PCT/CN2021/082914 priority patent/WO2022110592A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C13/00—Means for manipulating or holding work, e.g. for separate articles
    • B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides freezing coating equipment for an electrode, which comprises the electrode coating equipment and a freezing device arranged on a coating platform of the electrode coating equipment. The invention also provides a corresponding manufacturing method. According to the freezing coating equipment of the electrode, the freezing device is added on the basis of the traditional coating machine, so that freezing crystallization of directional temperature gradient is carried out on electrode slurry in the electrode manufacturing process, and finally the directional porous electrode is obtained after freezing drying, so that the traditional coating technology is combined with the freezing casting method of the existing directional pore electrode forming technology, the advantages of simplicity and high efficiency of the basic traditional coating technology are achieved, the purpose of manufacturing the directional pore electrode by the freezing casting method can be achieved, and the additional operation of subsequently associating the electrode and a current collector metal foil together is avoided.

Description

Freezing coating equipment and manufacturing method of electrode
Technical Field
The invention belongs to the field of lithium ion battery electrode manufacturing processes, and particularly relates to a freezing coating device and a manufacturing method thereof.
Background
Aiming at the manufacturing and industrialization industry of the lithium ion battery electrode at present, an economical and efficient coating process is generally applied.
The structure of the electrode coating equipment on the market is schematically shown in figure 1, which comprises a box 11, a conveyor belt device 12 arranged inside the box 11, a push rod 13 fixedly arranged on one conveying position of the conveyor belt device 12, a modulatable scraper 14 fixedly connected with the push rod 13 and a coating platform 15 positioned on the upper surface of the box 11, wherein the conveyor belt device 12 is driven by a motor to move, and the running speed of the conveyor belt can be changed through a speed regulating button; the distance between the blade 14 and the coating platform 15 is adjustable to accomplish coating of electrodes of different thicknesses. The specific working process is as follows: firstly, a current collector metal foil is paved on a coating platform 15, prepared electrode slurry with proper viscosity uniformity is poured onto the metal foil close to one side of the reset position of a push rod 13, a scraper 14 with the adjusted height is placed on one side of the uncoated electrode slurry, a power supply of a coating machine is switched on, coating is started after the operation speed is adjusted, a conveyor belt device 12 drives the push rod 13 to move, and then the push rod 13 drives the scraper 14 to move until the whole metal foil is fully paved with an electrode slurry film with uniform thickness. And drying the coated electrode under vacuum to remove the solvent, and finally obtaining the usable lithium ion battery electrode.
Although the electrode manufacturing method is simple and efficient and has already been industrialized, the microstructure of the obtained electrode is closely and irregularly arranged and the thickness of the electrode which can be manufactured is restricted, so that the diffusion rate of lithium ions is greatly restricted to cause the reduction of the actual working rate performance of the electrode, namely, the capacity of the battery is greatly attenuated during high-current-density charging and discharging. It is therefore desirable to develop an electrode fabrication method that produces an oriented pore electrode.
Existing manufacturing methods for making oriented pore electrodes are currently referred to in the literature, but have not been commercialized due to their limitations. Freeze casting, also known as ice-templating, is a new environmentally friendly material forming technique that has been developed in recent years to obtain oriented array cell shapes, see [ An, S., B.Kim, and J.Lee, Incompatable hardness and module of biomimetic porous polyurethane films prepared by directional melt crystallization of a solvent.Journal of Crystal Growth,2017.469:p.106-113]. The specific principle is as follows: the slurry prepared from the material and the solvent is placed on a frozen substrate, the solvent in contact with the substrate is firstly frozen and induces the solvent crystals to grow towards the direction of temperature gradient, so that solute material particles are repelled between the frozen solvent crystals, freeze drying is carried out after complete freezing is finished, and the solvent is directly sublimated from the solid, thus obtaining the material with the oriented porous structure. Due to the wide range of Materials available, including ceramics, metals, polymers and composites, coupled with the resulting controlled pore shape and size, the research in freeze casting for material forming has increased dramatically in recent years, and the superiority of this technology has received much attention, see in particular [ Zhang, h.and a.i. cooper, Aligned ports Structures by direct Materials,2007.19(11): p.1529-1533.]、[Mu,C.,et al.,Fabrication of microporous membranes by a feasible freeze method.Journal of Membrane Science,2010.361(1-2):p.15-21]、[Gaudillere,C.and J.M.Serra,Freeze-casting:Fabrication of highly porous and hierarchical ceramic supports for energy applications.Boletín de la Sociedad
Figure BDA0002799855990000021
de Cerámica y Vidrio,2016.55(2):p.45-54]。
The current application method of the freezing casting method in the lithium ion battery electrode manufacturing is generally that an electrode suspension liquid is placed on a metal medium immersed in liquid nitrogen to form a temperature gradient from the normal temperature of the surface of the suspension liquid to the contact interface of the lower surface and a cold end, so as to meet the condition of solvent oriented crystallization growth, and the subsequent freezing drying is carried out on the suspension liquid, so as to finally obtain the electrode with an oriented porous structure. However, the drawback is that an additional operation of connecting the resulting electrode with the current collector metal foil is required thereafter, which greatly reduces the continuity of the electrode manufacturing technique and on the contrary adds to its complexity and is not compatible with the current industrial manufacturing processes.
Disclosure of Invention
The invention aims to provide a freezing coating device and a manufacturing method of an electrode, so as to manufacture the electrode with a vertical pore structure.
In order to achieve the above object, the present invention provides a freezing coating apparatus for an electrode, comprising an electrode coating apparatus and a freezing device disposed on a coating platform of the electrode coating apparatus.
The refrigerating device comprises a semiconductor refrigerating sheet placed on the coating platform, two surfaces of the semiconductor refrigerating sheet are respectively a refrigerating surface and a heating surface, and the refrigerating surface faces upwards.
The refrigerating device further comprises a water cooling assembly matched with the semiconductor refrigerating sheet, the water cooling assembly comprises a water cooling head arranged between the heating surface and the coating platform, and a circulating water pump and a water outlet which are connected with the water cooling head through a water pipe, and the circulating water pump and the water outlet are both positioned in a water tank.
And the contact surface of the water cooling head and the heating surface is coated with heat-conducting silica gel.
The refrigerating device further comprises a power supply matched with the semiconductor refrigerating sheet, and the power supply is connected with the anode and the cathode of the semiconductor refrigerating sheet.
An electrode substrate is placed on the refrigerating surface.
The thickness of the electrode substrate is 0.1mm-10cm, and the contact surface of the refrigeration surface and the electrode substrate is coated with heat-conducting silica gel.
The electrode coating equipment comprises a box body, a conveyor belt device arranged in the box body, a push rod fixedly arranged on one conveying position of the conveyor belt device, a modulatable scraper connected with the push rod and the coating platform positioned on the upper surface of the box body.
The roller of the conveying belt device is horizontally arranged, and the roller of the conveying belt device and two ends of the conveying belt extend outwards from two sides of the box body; the push rod is for locating the montant at the both ends of conveyer belt and connecting a crossbeam between the top of two montants including two, and the crossbeam highly be higher than the coating platform, the scraper can install with modulating on the crossbeam.
In another aspect, the present invention provides a method for manufacturing an electrode by freeze coating, comprising:
s1: building a freezing coating device, wherein the freezing coating device comprises an electrode coating device and a freezing device arranged on a coating platform of the electrode coating device; the electrode coating equipment comprises a box body, a conveyor belt device arranged in the box body, a push rod fixedly arranged on one conveying position of the conveyor belt device, a modulatable scraper and a coating platform positioned on the upper surface of the box body;
s2: placing a metal foil on the freezer;
s3: pouring the prepared electrode slurry on one side of the metal foil close to the reset position of the push rod;
s4: mounting the scraper on the push rod and adjusting the height of the scraper so that the height of the cutting edge of the scraper is positioned between the push rod and the electrode slurry;
s5: switching on a power supply of the electrode coating equipment, setting a coating speed and starting coating;
s6: after coating is finished, the push rod returns to the reset position, and the power supply of the refrigerating device is switched on to obtain the electrode with electrode slurry completely frozen and crystallized;
s7: and (3) putting the electrode with the electrode slurry completely frozen and crystallized into a freeze dryer for drying to obtain the working electrode for assembling the battery.
In the step S1, the freezing device includes a semiconductor cooling plate placed on the coating platform, two surfaces of the semiconductor cooling plate are respectively a cooling surface and a heating surface, the cooling surface is upward, and an electrode substrate is placed on the cooling surface; in step S2, the metal foil is directly placed on the electrode substrate of the refrigeration device, or the metal foil is first placed on a substrate made of a different material and then placed on the electrode substrate.
In step S6, the time for turning on the power of the refrigeration apparatus is 1 second to 24 hours.
The freezing coating equipment of the electrode is added with the freezing device on the basis of the traditional coating machine to freeze and crystallize the electrode slurry in a directional temperature gradient in the electrode manufacturing process, and finally the directional porous electrode is obtained after freezing and drying, so that the traditional coating technology is combined with a freezing casting method which is a novel forming technology for obtaining the directional porous electrode at present, the freezing coating equipment of the electrode has the advantages of simplicity and high efficiency of the basic traditional coating technology, can realize the purpose of manufacturing the directional porous electrode by the freezing casting method, and avoids the subsequent additional operation of associating the electrode and a current collector metal foil together. The combination can improve the electrode microstructure obtained by the traditional industrialized electrode manufacturing technology so as to break through the limitation of the electrochemical performance of the electrode, and simultaneously reduce the additional operation of connecting a current collector when the electrode is manufactured by a freezing casting method, so that the freezing casting method is compatible with the traditional industrialized lithium battery electrode manufacturing technology, the manufacturing quantity is enlarged, the manufacturing efficiency is improved, the efficiency of manufacturing the porous electrode is greatly improved, and the win-win of the electrochemical performance and the industrialized efficiency of manufacturing the electrode is realized.
Drawings
Fig. 1 is a schematic structural view of a conventional electrode coating apparatus.
Fig. 2 is a schematic structural view of a freeze coating apparatus for an electrode according to an embodiment of the present invention, in which a partial structure of the electrode coating apparatus is omitted.
Fig. 3 is a schematic view showing the structure of a semiconductor chilling plate of the freeze coating apparatus for an electrode shown in fig. 2.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Fig. 2 shows an electrode freeze coating apparatus according to an embodiment of the present invention, which includes an electrode coating apparatus 1 and a freezing device disposed on a coating stage of the electrode coating apparatus 1.
The electrode coating apparatus 1 has the same structure as the conventional electrode coating apparatus 1, and as shown in fig. 1, includes a housing 11, a conveyor belt device 12 installed inside the housing 11, a push rod 13 fixedly installed at a conveying position of the conveyor belt device 12, a modulatable blade 14 fixedly connected to the push rod 13, and a coating platform 15 located on an upper surface of the housing 11, whereby the coating platform 15 is installed on the housing 11. The conveyor belt device 12 has a roller and a conveyor belt, and in this embodiment, the roller of the conveyor belt device 12 is horizontally disposed, and both ends of the roller and the conveyor belt of the conveyor belt device 12 extend outward from both sides of the box 11. The push rod 13 comprises two vertical rods 131 arranged at two ends of the conveyor belt and a cross beam 132 connected between the top ends of the two vertical rods 131, and the height of the cross beam 132 is higher than that of the coating platform 15. The blade 14 is adjustably mounted on the cross beam 132 so that the height of the blade 14 is above the coating deck 15 and the height of the blade 14 is adjustable by the screw arrangement of the blade to accomplish coating of electrodes of different thicknesses. The conveyor means 12 is driven by a motor and the speed of operation of the conveyor means 12 can be varied by means of a speed control button.
Referring to fig. 2 again, the freezing device 2 includes a semiconductor chilling plate 21 disposed on the coating platform 15, and a water cooling assembly 22 and a power supply 23 associated therewith. Wherein, the semiconductor refrigeration piece is used as a refrigeration source.
Referring to fig. 2 and 3, two surfaces of the semiconductor chilling plate 21 are a chilling surface 211 and a heating surface 212, respectively, the chilling surface 211 faces upwards, an electrode substrate 24 is placed on the chilling surface 211, and the thickness of the electrode substrate is 0.1mm-10 cm. The water cooling assembly 22 comprises a water cooling head 221 arranged between the heating surface 212 and the coating platform 15, and a circulating water pump 222 and a water outlet 223 which are connected with the water cooling head 221 through water pipes, wherein the circulating water pump 222 and the water outlet 223 are both positioned in a water tank 224, so as to form a simple circulating water cooling system. Therefore, the heating surface 212 of the semiconductor cooling plate 21 is in contact with the water cooling assembly 22 to ensure good heat dissipation of the heating surface 212, so that the semiconductor cooling plate 21 reaches the theoretical cooling capacity of the cooling surface 211. The temperature of the refrigerating surface is 0 to-273.15 ℃.
The power supply 23 is connected with the anode and the cathode of the semiconductor refrigerating sheet 21, and the power supply 23 is also connected with the anode and the cathode of other power supplies with rated power larger than the refrigerating power parameter.
According to the freezing coating equipment for the electrode, disclosed by the invention, the freezing device is added on the basis of the traditional coating machine, so that the porous microstructure electrode is finally obtained by carrying out subsequent processing operations such as freezing crystallization, freezing drying and the like after normal coating is finished, the traditional coating technology is combined with a freezing casting method for obtaining a novel directional porous electrode forming technology at present, the limitation of the traditional electrode structure is broken through, and meanwhile, the economic efficiency and the optimized electrode structure performance of the electrode manufacturing process are realized. Therefore, from the achieved technical effects, the freezing coating equipment of the electrode is combined with a novel structural design forming method used in the research of the lithium battery industry in recent years, so that the limitation of the electrode structure in the current lithium battery electrode manufacturing industry can be broken through, the combination of the novel structural forming method and the traditional coating process is realized, and the energy density of the lithium battery is further improved. In addition, the freezing coating equipment of the electrode is based on the traditional coating machine, and the designed freezing device has simple structure and low cost, so the total cost is low, and the economic requirement of marketization is met.
The electrode manufactured by the freezing coating equipment of the electrode has more excellent rate performance than a common electrode obtained by a traditional coating process, namely, higher capacity is realized under high-rate charge and discharge, and the advantages are more obvious under higher rate.
The same electrode slurry respectively adopts the freezing coating equipment of the electrode and the traditional coating equipment to manufacture the electrode, the obtained electrode is subjected to microstructure and electrochemical performance characterization, the microstructure characterization result shows that the electrode structure prepared by the traditional coating equipment is closely and irregularly arranged, and the electrode obtained by the freezing coating equipment of the electrode is microscopically in a porous structure which is directionally arranged along the vertical direction. From the electrochemical performance characterization results, the results of charge-discharge cycle tests of the electrodes obtained by the two processes under the same multiplying power show that the two electrodes have no obvious difference under the low multiplying power (0.1C), but the electrode obtained by adopting the freezing coating equipment of the electrode has excellent performance under the high multiplying power, specifically, the frozen electrode maintains the discharge capacity of 65.9mAh/g under the multiplying power of 5C, and the discharge capacity of the traditional coated electrode maintains 55.8 mAh/g; at the rate of 20C, the electrode obtained by the traditional coating equipment loses the charge and discharge capacity, but the electrode prepared by the freeze coating equipment of the electrode still keeps the discharge capacity of 32.8 mAh/g. From the electrochemical performance, the electrode obtained by the freeze coating equipment of the electrode designed by the invention is more excellent in performance, and therefore, the superiority of the invention is embodied.
Based on the electrode freeze coating equipment, the realized electrode freeze coating manufacturing method has the following specific working flow:
step S1: setting up a freeze coating apparatus based on the above;
step S2: placing a metal foil on the freezing device 2; because the refrigerating device 2 comprises the semiconductor refrigerating sheet 21 arranged on the coating platform 15, and the refrigerating surface 211 of the semiconductor refrigerating sheet 21 is provided with the electrode substrate 24, the metal foil is arranged on the electrode substrate 24 of the refrigerating device 2;
the metal foil may be directly disposed on the electrode substrate 24 of the freezing device, or disposed on a substrate made of different materials and then disposed on the electrode substrate 24 to change the freezing rate. In this example, the aluminum foil was first placed on an aluminum plate having dimensions of 10cm by 5 mm.
Step S3: pouring the prepared electrode slurry on one side of the metal foil close to the reset position of the push rod 13; the electrode slurry has proper viscosity and is uniformly dispersed. In the present example, since the electrode was prepared as the positive electrode material for a lithium battery (ternary material LiNi)0.8Mn0.1Co0.1O2And lithium iron phosphate LiFePO4) The porous electrode and the electrode slurry comprise active materials, conductive materials and binders.
Step S4: a modulatable scraper 14 is mounted on the pushrod 13 and its height adjusted so that the height of the edge of the scraper 14 is between the pushrod 13 and the electrode slurry.
Step S5: switching on a power supply of the electrode coating equipment 1, setting a coating speed and starting coating; wherein the set coating speed is 1 mm/min-1 m/s;
step S6: after the coating is finished, the push rod 13 returns to the reset position, and the power supply (namely the power supply of the water pump and the power supply of the semiconductor refrigerating sheet) of the refrigerating device 2 is switched on to circularly radiate heat and refrigerate the electrode substrate 24, so that the electrode of the electrode slurry completely frozen crystal is obtained; the power of the freezing device 2 is turned on for a period of 1 second to 24 hours to ensure complete freezing crystallization of the electrode slurry. In the present embodiment, the time for turning on the power of the refrigerating apparatus 2 is about 15 minutes. The electrode substrate 24 may be connected to an external thermocouple to monitor the temperature of the electrode substrate 24 in real time.
Step S7: and (3) putting the electrode with the electrode slurry completely frozen and crystallized into a freeze dryer for drying to obtain the working electrode for assembling the battery. In this embodiment, the working electrode is lithium iron phosphate LiFePO4A working electrode.
Thus, a freeze-coated preparation of the electrode can be achieved.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.

Claims (11)

1. The freezing coating equipment of the electrode is characterized by comprising the electrode coating equipment (1) and a freezing device (2) arranged on a coating platform of the electrode coating equipment (1).
2. The apparatus for freeze coating of electrodes according to claim 1, characterized in that said freezing device (2) comprises a semiconductor chilling plate (21) placed on the coating platform (15), the two faces of said semiconductor chilling plate (21) being a chilling face (211) and a heating face (212), respectively, said chilling face (211) facing upwards.
3. The freezing coating equipment of electrode according to claim 2, characterized in that the freezing device (2) further comprises a water cooling component (22) matched with the semiconductor cooling plate (21), the water cooling component (22) comprises a water cooling head (221) arranged between the heating surface (212) and the coating platform (15), and a circulating water pump (222) and a water outlet (223) connected with the water cooling head (221) through water pipes, and the circulating water pump (222) and the water outlet (223) are both positioned in a water tank (224); and the refrigerating device (2) further comprises a power supply (23) matched with the semiconductor refrigerating sheet (21), and the power supply (23) is connected with the anode and the cathode of the semiconductor refrigerating sheet (21).
4. The freeze coating apparatus of an electrode according to claim 3, wherein the contact surface of the water cooling head (221) and the heating surface (212) is coated with a heat conductive silica gel.
5. The apparatus for freeze coating of electrodes according to claim 2, characterized in that an electrode substrate (24) is placed on the refrigerated surface (211).
6. The freeze coating apparatus of an electrode according to claim 5, characterized in that the thickness of the electrode substrate (24) is 0.1mm-10cm and the contact surface of the refrigeration surface (211) and the electrode substrate (24) is coated with a heat conductive silica gel.
7. The apparatus for freeze coating of electrodes according to claim 1, characterized in that the electrode coating apparatus (1) comprises a housing (11), a conveyor means (12) mounted inside the housing (11), a pusher (13) fixedly mounted on a conveying position of the conveyor means (12), a modulatable scraper (14) connected to the pusher (13) and the coating platform (15) located on the upper surface of the housing (11).
8. The apparatus for freeze coating of electrodes according to claim 7, wherein the rollers of the conveyor means (12) are arranged horizontally and the rollers of the conveyor means (12) and the two ends of the conveyor extend outwards from the two sides of the box (11); the push rod (13) comprises two vertical rods (131) arranged at two ends of the conveying belt and a cross beam (132) connected between the top ends of the two vertical rods (131), the height of the cross beam (132) is higher than that of the coating platform (15), and the scraper (14) is arranged on the cross beam (132) in a modulatable mode.
9. A method of freeze coating an electrode, comprising:
step S1: building a freezing coating device, wherein the freezing coating device comprises an electrode coating device (1) and a freezing device (2) arranged on a coating platform of the electrode coating device (1); the electrode coating equipment (1) comprises a box body (11), a conveyor belt device (12) arranged inside the box body (11), a push rod (13) fixedly arranged on one conveying position of the conveyor belt device (12), a modulable scraper (14) and a coating platform (15) positioned on the upper surface of the box body (11);
step S2: placing a metal foil on the freezing device (2);
step S3: pouring the prepared electrode slurry on one side of the metal foil close to the reset position of the push rod (13);
step S4: mounting the scraper (14) on the push rod (13) and adjusting the height of the scraper (14) so that the height of the cutting edge of the scraper (14) is positioned between the push rod (13) and the electrode slurry;
step S5: switching on a power supply of the electrode coating equipment (1), setting a coating speed and starting coating;
step S6: after coating is finished, the push rod (13) returns to the reset position, and the power supply of the refrigerating device (2) is switched on to obtain the electrode with electrode slurry completely frozen and crystallized;
step S7: and (3) putting the electrode with the electrode slurry completely frozen and crystallized into a freeze dryer for drying to obtain the working electrode for assembling the battery.
10. The method for manufacturing the electrode by freezing coating according to claim 9, wherein in the step S1, the freezing device (2) comprises a semiconductor chilling plate (21) placed on the coating platform (15), two surfaces of the semiconductor chilling plate (21) are a chilling surface (211) and a heating surface (212), the chilling surface (211) faces upwards, and an electrode substrate (24) is placed on the chilling surface (211); and is
In step S2, the metal foil is directly placed on the electrode substrate (24) of the refrigeration apparatus (2), or the metal foil is first placed on a base made of a different material and then placed on the electrode substrate (24).
11. The method for producing an electrode by freeze coating according to claim 9, wherein in step S6, the time for turning on the power of the freezing device (2) is 1 second to 24 hours.
CN202011346096.9A 2020-11-25 2020-11-25 Freezing coating equipment and manufacturing method of electrode Pending CN112517335A (en)

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PCT/CN2021/082914 WO2022110592A1 (en) 2020-11-25 2021-03-25 Electrode freeze-coating equipment and manufacturing method

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CN114335532A (en) * 2021-12-14 2022-04-12 华中科技大学 Lithium ion battery anode lithium supplementing method based on freeze drying and product
CN114551811A (en) * 2022-02-22 2022-05-27 北京航空航天大学 Preparation method of vertical MXene array pole piece, vertical MXene array pole piece and application
WO2022110592A1 (en) * 2020-11-25 2022-06-02 中国科学院上海高等研究院 Electrode freeze-coating equipment and manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022110592A1 (en) * 2020-11-25 2022-06-02 中国科学院上海高等研究院 Electrode freeze-coating equipment and manufacturing method
CN114335532A (en) * 2021-12-14 2022-04-12 华中科技大学 Lithium ion battery anode lithium supplementing method based on freeze drying and product
CN114551811A (en) * 2022-02-22 2022-05-27 北京航空航天大学 Preparation method of vertical MXene array pole piece, vertical MXene array pole piece and application

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