CN112802987A - Method for preparing electrode slice by dry rolling - Google Patents

Method for preparing electrode slice by dry rolling Download PDF

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Publication number
CN112802987A
CN112802987A CN202011615685.2A CN202011615685A CN112802987A CN 112802987 A CN112802987 A CN 112802987A CN 202011615685 A CN202011615685 A CN 202011615685A CN 112802987 A CN112802987 A CN 112802987A
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foil
film
powder
width
rolling
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CN112802987B (en
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王亮
宋庆焕
吴冠豪
王晓
郑赫
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • 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)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to the technical field of lithium ions and discloses a method for preparing an electrode plate by dry rolling. The method comprises the following steps: 1) enabling the first film and the foil to simultaneously pass through the opposite first rollers, adding first powder into a gap between the first film and the foil, and performing first rolling to form a first powder laminated layer on one side surface of the foil; 2) enabling the first film material, the second film material and the foil with the first powder laminated layer to simultaneously pass through the opposite second rollers, adding second powder into a gap between the second film material and the other side surface of the foil, and performing second roller pressing to form a second powder laminated layer on the other side surface of the foil; 3) and separating the first membrane material and the second membrane material from the side surface of the foil respectively to obtain the electrode slice. The method can realize simultaneous rolling, laminating and sheet making of double surfaces, simplify the process flow, reduce the process equipment and continuously prepare the electrode sheet with uniform thickness.

Description

Method for preparing electrode slice by dry rolling
Technical Field
The invention relates to the technical field of lithium ions, in particular to a method for preparing an electrode plate by dry rolling.
Background
In the industrial environment of automobiles using traditional energy as power supply, the problem of environmental pollution has led to attention on environmental protection and resource utilization.
The lithium ion equipment technology is a key technology for the development of electric automobiles. The dry coating technology is one of the most advanced lithium ion battery manufacturing technologies at present, wherein a dry rolling sheet-making process is the key of the process, and the dry rolling sheet-making process is the development direction of the process.
The existing dry rolling equipment has complex process, and after powder is rolled in the first rolling, under the action of a roller gap, pressure and temperature, the prepared sheet cannot be controlled in tension, and discontinuous tape winding causes a series of process problems such as tape breakage, particle falling, roller sticking, poor uniformity and the like.
Disclosure of Invention
The invention aims to overcome the problems of belt breakage, particle falling, roller sticking and the like in the dry rolling process in the prior art, and provides a method for preparing an electrode plate by dry rolling. The sheet-making method provided by the invention can realize simultaneous rolling, laminating and sheet-making of double surfaces, simplify the process flow, reduce the process equipment and continuously prepare the electrode sheet with uniform thickness.
In order to achieve the above object, the present invention provides a method for preparing an electrode sheet by dry rolling, comprising the steps of:
1) enabling the first film and the foil to simultaneously pass through the opposite first rollers, adding first powder into a gap between the first film and the foil, and performing first rolling to form a first powder laminated layer on one side surface of the foil;
2) enabling the first film material, the second film material and the foil with the first powder laminated layer to simultaneously pass through the opposite second rollers, adding second powder into a gap between the second film material and the other side surface of the foil, and performing second roller pressing to form a second powder laminated layer on the other side surface of the foil;
3) and separating the first membrane material and the second membrane material from the side surface of the foil respectively to obtain the electrode slice.
Preferably, in step 1), after the first rolling, the first film is separated from the foil by a guide roll.
Preferably, in step 1), the width of the first film is smaller than the width of the foil, and more preferably, the width of the first film is 15% -90% of the width of the foil.
Preferably, the width of the first roller is greater than or equal to the width of the first film material, and more preferably, the width of the first roller is 120-160% of the width of the first film material.
Preferably, the foil is a copper foil, an aluminum foil, a nickel foil, a stainless steel foil or a zinc foil.
Preferably, the foil has a thickness of 3-20 μm.
Preferably, in step 1), the particle size of the first powder is 0.5-20 μm.
Preferably, the curing temperature of the first powder is 40-100 ℃.
Preferably, the first powder is a mixture of an active material, a binder and a conductive agent.
Preferably, the first powder is preheated to 40-100 ℃ and then is added.
Preferably, the first powder is added after premixing.
Preferably, in the step 1), the working pressure of the first rolling is 30-75T/cm2。
Preferably, the working temperature of the first rolling is 90 to 180 ℃.
Preferably, the feeding speed of the foil is 1-50 m/min.
Preferably, the feeding speed of the first film material is 1-50 m/min.
Preferably, in step 2), the width of the second film is smaller than the width of the foil, and more preferably, the width of the second film is 15% -90% of the width of the foil.
Preferably, the width of the second roller is greater than or equal to the width of the second film material, and more preferably, the width of the second roller is 120-160% of the width of the second film material.
Preferably, in step 2), the particle size of the second powder is 0.5-20 μm.
Preferably, the curing temperature of the second powder is 40-100 ℃.
Preferably, the second powder is a mixture of an active material, a binder and a conductive agent.
Preferably, the second powder is preheated to 40-100 ℃ and then added.
Preferably, the second powder is premixed and then added.
Preferably, in the step 2), the working pressure of the second rolling is 30-75T/cm2。
Preferably, the second rolling has an operating temperature of 90 to 180 ℃.
Preferably, the feeding speed of the second film material is 1-50 m/min.
Preferably, the first film material is the same as the second film material.
Preferably, the film material is a heat-resistant film material, and the heat-resistant temperature is higher than 180 ℃.
Preferably, the film material is a PET, PI or PE film.
Preferably, the number of repetitions of the first rolling is 1 or more.
Preferably, the second rolling is repeated 1 or more times.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method provided by the invention can avoid the phenomena of uneven thickness, fragment and wrinkle caused by the roller sticking of the powder, and can obtain continuous and even-thickness electrode plates;
(2) the method provided by the invention can realize simultaneous rolling and laminating of double surfaces, and simplifies the process flow and reduces the process equipment by a one-time rolling and tabletting mode.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing an electrode sheet by dry rolling according to the present invention;
FIG. 2 is a schematic step-by-step diagram of a method for preparing an electrode sheet by dry rolling according to the present invention;
fig. 3 is a schematic step-by-step diagram of the method for preparing the electrode sheet by dry rolling according to the invention.
Description of the reference numerals
11. A first film material 12 and a second film material
2. Foil 21, one side of foil
22. The other side of the foil
31. Vertical roller 132, vertical roller 2
41. Horizontal roller 142 and horizontal roller 2
51. First charging bin 152 and second charging bin 2
6. Guide roller 7 and electrode plate
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, one or more new ranges of values may be obtained from combinations of values between the endpoints of each range, the endpoints of each range and the individual values, and the individual values of the points, and these ranges of values should be considered as specifically disclosed herein.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right in the drawings, and "inner, outer" means inner and outer of the corresponding structures, unless otherwise specified.
Fig. 1 is a schematic flow chart of a method for preparing an electrode sheet by dry rolling according to the present invention; fig. 2 and fig. 3 are schematic step-by-step diagrams of a method for preparing an electrode sheet by dry rolling according to the invention. The preparation process of the present invention is described in further detail below with reference to the attached drawing figures, wherein like numerals indicate like features throughout.
The invention provides a method for preparing an electrode plate by dry rolling, which comprises the following steps:
1) simultaneously passing the first film 11 and the foil 2 between the opposite first rollers 31 and 32, and adding a first powder into a gap between the first film 11 and the foil 2 to perform first rolling, so as to form a first powder laminated layer on one side surface 21 of the foil 2;
2) simultaneously passing the first film 11, the second film 12 and the foil 2 with the first powder laminated layer formed thereon between the two opposite second rollers 41, 42, and performing second rolling by adding the second powder into the gap between the second film 12 and the other side surface 22 of the foil 2 to form a second powder laminated layer on the other side surface 22 of the foil 2;
3) the first film 11 and the second film 12 are separated from the side surfaces 21 and 22 of the foil 2, respectively, to obtain electrode sheets.
The inventor of the invention researches and discovers that in dry rolling, by additionally arranging a film material between the contact surface of powder to be pressed and a press roll until the sheet making is finished, and by additionally arranging the film material for isolated rolling, the problems of roller sticking and thickness nonuniformity caused by direct contact of the powder material and the roll surface in the rolling process are avoided, and further, the inventor discovers that by performing isolated rolling through the film material, the problems of belt breakage, particle falling and the like caused by the tension reason of the manufactured sheet are avoided.
Step 1) the first film 11 and the foil 2 are simultaneously passed between opposite first rollers 31, 32 and a first powder is added into the gap between the first film 11 and the foil 2 to perform a first rolling to form a first powder laminate layer on one side 21 of the foil 2.
In a preferred embodiment of the present invention, the first film 11 and the foil 2 simultaneously pass between the first rollers 31, 32 and the first feeding bin 51 to feed the first powder between the first film 11 and the foil 2, and after the first powder is rolled, a first laminate layer is formed on one side 21 of the foil 2, and the first film is not separated from the foil 2. In this case, in the process of forming the second powder laminate layer in step 2), the foil 2 having the first film 11 on one side and the first laminate layer formed on the other side and the second film 12 pass through the second rollers 41 and 42 facing each other at the same time, and the second powder is fed between the second film 12 and the other side 22 of the foil 2, and after the second rolling, the second powder laminate layer is formed on the other side 22 of the foil 2.
As another preferred embodiment of the present invention, as shown in fig. 2, the first film 11 and the foil 2 pass through the first rollers 31 and 32 facing each other at the same time, the first powder is fed between the first film 11 and the foil 2 through the first feed bin 51, and after the first film is rolled, the first film is separated from the foil 2 by the guide roller 6, and a first lamination layer is formed on one side of the foil 2.
In the method of the present invention, preferably, the width of the first film is smaller than the width of the foil, more preferably the width of the first film is 15% to 90% of the width of the foil, still more preferably the width of the first film is 30% to 90% of the width of the foil, and still more preferably the width of the first film is 45% to 90% of the width of the foil. Through set up the membrane material in the middle of compression roller and foil, avoid the contact of powder and compression roller in rolling process to reduce the problem of the roller sticking and thickness inhomogeneity that powder and roll surface direct contact caused, further ensure the continuity and the stability of making the preforming.
In the method of the present invention, the width of the first roller is preferably equal to or greater than the width of the first film material, more preferably the width of the first roller is 120% to 160% of the width of the first film material, even more preferably the width of the first roller is 130% to 160% of the width of the first film material, and even more preferably the width of the first roller is 140% to 160% of the width of the first film material. By setting the width of the press roll to be wider than the width of the film material, it is further ensured that the press roll does not come into contact with the powder during rolling, thereby ensuring continuity and stability of the resulting tablet.
In the method of the present invention, preferably, the film material is a heat-resistant film material, and the heat-resistant temperature is higher than 180 ℃, more preferably 180-.
In the method of the present invention, preferably, the first film material is a PET, PI, or PE film. In a specific embodiment of the invention, the first film material is a PET film.
For the above foils, the skilled person can make specific selections as required. In the method of the present invention, the foil is a copper foil, an aluminum foil, a nickel foil, a stainless steel foil or a zinc foil.
The thickness of the foil may be, for example, 3 to 20 μm, and in the method of the present invention, the thickness of the foil is preferably 5 to 14 μm. In a specific embodiment of the invention, an aluminum foil with a thickness of 14 μm is used.
In the process of the present invention, the first powder preferably has a particle size of 0.5 to 20 μm, more preferably 7 to 13 μm. By controlling the particle size of the powder, the foil or film is prevented from being damaged by overlarge particles in the rolling process, and the prepared tablet is ensured to be uniform in thickness.
In the invention, the powder is a battery mixed powder and comprises an active substance, a binder and a conductive agent. In the method of the present invention, preferably, the first powder is a mixture of an active material, a binder and a conductive agent. Wherein, the active substance can be a transition metal oxide type anode material, a polyanion type anode material or a polymer anode material; the conductive agent can be one or more selected from acetylene black, carbon fiber, carbon nanotube, ketjen black, conductive graphite, graphene and activated carbon; the binder can be one or more selected from sodium carboxymethylcellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyacrylonitrile, sodium alginate, chitosan, polyvinyl alcohol, polybutyl acrylate and polyethylene oxide.
The weight ratio of the active material, the adhesive and the conductive agent is (70-90): (5-10): (3-10). In the specific embodiment of the invention, the first powder is a high-nickel ternary cathode material, and the weight ratio of the sodium carboxymethyl cellulose to the ketjen black is 85: 7: 8 in the presence of a solvent.
In the process of the invention, the curing temperature of the first powder may be from 40 to 100 ℃ and preferably from 40 to 60 ℃.
In the process of the invention, the first powder is preferably preheated to a temperature of 40 to 100 ℃ and more preferably 40 to 60 ℃ before being fed. By preheating the powder, it is further ensured that the powder solidifies to form the lamination layer during the rolling process.
In the method of the present invention, preferably, the method further comprises: and premixing the first powder and then adding the first powder. In an embodiment of the invention, the first powder is added after being stirred to fiberization (fluffy cotton mass).
In the method of the present invention, it is preferable that the working pressure of the first rolling is 30 to 75T/cm2More preferably 40 to 55T/cm2. In addition, the working temperature of the first rolling is preferably 90 to 180 ℃, and more preferably 130 to 160 ℃.
In the method of the present invention, the feeding speed of the foil is preferably 1 to 50m/min, more preferably 1 to 10m/min, and still more preferably 1 to 5 m/min.
In the method of the present invention, the feeding speed of the first film material 11 is preferably 1 to 50m/min, more preferably 1 to 5m/min, and still more preferably 1 to 3 m/min.
The feeding speed of the first film may be the same as or different from the feeding speed of the foil, and it is preferable that the feeding speed of the film is smaller than the feeding speed of the foil in view of the cost of the film. In an embodiment of the invention, the feeding speed of the foil is 5m/min and the feeding speed of the first film is 3 m/min.
In the above-described first rolling process, the rolling may be repeated as necessary, and in the method of the present invention, the number of repetitions of the first rolling is 1 or more, preferably 1 to 2.
Next, step 2 will be specifically described with reference to fig. 3.
And 2) enabling the first film material 11, the second film material 12 and the foil 2 with the first powder laminated layer to simultaneously pass through the opposite second rollers 41 and 42, adding second powder into a gap between the second film material 12 and the other side surface 22 of the foil 2, and performing second roller pressing to form a second powder laminated layer on the other side surface 22 of the foil 2.
Fig. 3 is a schematic step-by-step diagram of a method for preparing an electrode sheet by dry rolling. The first film 11, the second film 12 and the foil 2 formed with the first powder lamination layer pass through the opposite second rollers 41, 42 simultaneously, and the second powder is added between the second film 12 and the other side surface 22 of the foil 2, after the second rolling, the second film is separated from the foil 2, and the second powder lamination layer is formed on the other side surface 22 of the foil 2.
In the method of the present invention, preferably, the width of the second film is smaller than the width of the foil, more preferably, the width of the second film is 15% to 90% of the width of the foil, still more preferably, the width of the second film is 30% to 90% of the width of the foil, and still more preferably, the width of the second film is 45% to 90% of the width of the foil. Through set up the second membrane material between compression roller and foil, avoid the contact of powder and compression roller in rolling process to reduce the problem of the roller sticking and thickness inhomogeneity that powder and roll surface direct contact caused, further ensure the continuity and the stability of making the preforming.
In the method of the present invention, the width of the second roller is preferably equal to or greater than the width of the second film material, more preferably the width of the second roller is 120% to 160% of the width of the second film material, even more preferably the width of the second roller is 130% to 160% of the width of the second film material, and even more preferably the width of the second roller is 140% to 160% of the width of the second film material. By setting the width of the press roll to be wider than the width of the film material, it is further ensured that the press roll does not come into contact with the powder during rolling, thereby ensuring continuity and stability of the resulting tablet.
In the method of the present invention, preferably, the film material is a heat-resistant film material, and the heat-resistant temperature is preferably higher than 180 ℃, and more preferably 180-.
In the method of the present invention, the film material is preferably a PET, PI or PE film. In a specific embodiment of the invention, the second film material and the first film material are both PET films.
In the process of the invention, the particle size of the second powder is preferably from 0.5 to 20 μm, more preferably from 7 to 13 μm. By controlling the particle size of the powder, the foil or film is prevented from being damaged by overlarge particles in the rolling process, and the prepared tablet is ensured to be uniform in thickness.
In the invention, the powder is a battery mixed powder and comprises an active substance, a binder and a conductive agent. In the method of the present invention, preferably, the second powder is a mixture of an active material, a binder and a conductive agent. Wherein, the active substance can be a transition metal oxide type anode material, a polyanion type anode material or a polymer anode material; the conductive agent can be one or more selected from acetylene black, carbon fiber, carbon nanotube, ketjen black, conductive graphite, graphene and activated carbon; the binder can be one or more selected from sodium carboxymethylcellulose, styrene butadiene rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyacrylonitrile, sodium alginate, chitosan, polyvinyl alcohol, polybutyl acrylate and polyethylene oxide.
The weight ratio of the active material, the adhesive and the conductive agent is (70-90): (5-10): (3-10). In a particular embodiment of the invention, the second powder is identical to the first powder.
In the process of the invention, the curing temperature of the second powder may be from 40 to 100 ℃ and preferably from 40 to 60 ℃.
In the method of the invention, the second powder is preferably preheated to 40-100 ℃ and then added. By preheating the powder, it is further ensured that the powder solidifies to form the lamination layer during the rolling process.
In the method of the present invention, preferably, the method further comprises: and premixing the second powder and then adding the second powder. In a particular embodiment of the invention, the second powder is added by stirring until fiberization.
In the method of the present invention, it is preferable that the second rolling is performed at a working pressure of 30 to 75T/cm2More preferably 40 to 55T/cm2. Further, the working temperature of the second rolling is preferably 90 to 180 ℃, and more preferably 150 to 180 ℃.
In the method of the present invention, the feeding speed of the second film material 12 is preferably 1 to 50m/min, more preferably 1 to 5m/min, and still more preferably 1 to 3 m/min.
The feeding speed of the second film may be the same as or different from the feeding speed of the foil, and it is preferable that the feeding speed of the film is smaller than the feeding speed of the foil in view of the cost of the film. In an embodiment of the invention, the feeding speed of the foil is 5m/min and the feeding speed of the second film is 3 m/min.
In the above-mentioned second rolling, the rolling may be repeated as necessary, and in the method of the present invention, the number of times of the second rolling is repeated is 1 or more, preferably 1 to 2 times.
And (2) after a first powder laminating layer is formed on one side surface of the foil in the step 1) and a second powder laminating layer is formed on the other side surface of the foil in the step 2), the film is separated from the foil to obtain the electrode plate.
In a preferred embodiment of the present invention, the first film 11 and the foil 2 simultaneously pass between the first rollers 31 and 32 and the first feeding bin 51 to add the first powder between the first film 11 and the foil 2, and after the first powder is rolled, a first laminate layer is formed on one side 21 of the foil 2, and the first film is not separated from the foil 2. In the process of forming the second powder laminating layer, the foil 2 with the first film 11 on one side and the first laminating layer formed on the other side and the second film 12 simultaneously pass through the opposite second rollers 41 and 42, and the second powder is added between the second film 12 and the other side 22 of the foil 2, after the second rolling, the second powder laminating layer is formed on the other side 22 of the foil 2, at the moment, the first film 11 and the second film 12 are respectively separated from the side of the foil, and the electrode plate is obtained.
In another preferred embodiment of the present invention, the first film 11 and the foil 2 simultaneously pass between the first rollers 31, 32 and the first feeding bin 51 to feed the first powder between the first film 11 and the foil 2, and after rolling, a first laminate layer is formed on one side 21 of the foil 2, and the first film is separated from the foil 2 by the guide roller 6. In the process of forming the second powder laminated layer, the foil 2 with the first laminated layer formed on the first film 11 and the other side surface and the second film 12 simultaneously pass through the opposite second rollers 41 and 42, the second powder is added between the second film 12 and the other side surface 22 of the foil 2, after the second roller pressing, the second powder laminated layer is formed on the other side surface 22 of the foil 2, and at the moment, the first film 11 and the second film 12 are respectively separated from the side surface of the foil to obtain the electrode plate.
Example 1
This example is used to illustrate the method for preparing an electrode sheet by dry rolling according to the present invention, with reference to fig. 1.
The first powder used in this example 1 is the same as the second powder, is a mixture of a high-nickel ternary positive electrode material, sodium carboxymethylcellulose and ketjen black (the weight ratio of the high-nickel ternary positive electrode material, sodium carboxymethylcellulose and ketjen black is 85: 7: 8), has an average particle size of 10 μm, is premixed into fibers, and is added into a charging bin; the first film material and the second film material are both PET films, and the foil material is an aluminum foil with the thickness of 14 mu m.
The preparation method comprises the following steps:
(1) a first film material 11(3m/min) and a foil material (5m/min) are unreeled, and simultaneously vertically pass through the space between the opposite first rollers (specifically, vertical rollers 31 and 32), a first powder material is added into the gap between the first film material and the foil material through a first feeding bin 51 at a feeding speed of 400g/min, and the feeding speed is 50T/cm2And performing first rolling at 150 ℃ to form a first powder laminating layer on one side surface 21 of the foil 2, and continuously winding the rolled first film 11 on the surface of the next roller by a guide roller 6 until the film is rolled. At this time, a first powder laminate layer rolled by first rolling of the powder is bonded to one surface side 21 of the foil to form a single-layer electrode sheet.
Wherein the width of the foil 2 is 300mm, the width of the first film 11 is 220mm, and the width of the vertical roller is 350 mm.
(2) The second film material 12(3m/min) and the single-layer electrode sheet (5m/min) are continuously unreeled, meanwhile, the second film material vertically passes through the space between the opposite second rollers (specifically, the horizontal rollers 41 and 42), the second powder material is added into the gap between the second film material and the other side surface of the foil material through a second feeding bin 52 at the feeding speed of 400g/min, and the feeding speed is 50T/cm2And at 150 ℃, a second roll pressing is carried out to form a second powder laminate layer on the other side 22 of the foil 2. At this time, the powder material is passed throughAnd a second powder laminated layer formed by second rolling is attached to the other side surface 21 of the foil 2 to form the double-layer electrode plate 7.
(3) The first film material 11, the second film material 12 and the electrode sheet are respectively rolled.
The electrode slice prepared by the method has certain hardness and flexibility, and can realize continuous preparation without belt breakage in the preparation process.
Comparative example 1
The same procedure was followed as in example 1, except that: and in the rolling process, only the foil is fed, and the first film material and the second film material are not fed, namely, in the rolling process, the press roller is directly contacted with the powder for rolling to prepare the double-layer electrode plate.
In the preparation process, the phenomena of belt breakage and particle falling occur, and the phenomenon that powder is adhered to the surface of the compression roller can be observed, so that the continuous production of the electrode plate is influenced.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. The method for preparing the electrode plate by dry rolling is characterized by comprising the following steps:
1) simultaneously passing the first film (11) and the foil (2) between opposite first rollers (31, 32), and performing first rolling by adding first powder into a gap between the first film (11) and the foil (2) to form a first powder laminated layer on one side surface (21) of the foil (2);
2) passing the first film (11), the second film (12) and the foil (2) with the first powder laminated layer formed thereon through the opposite second rollers (41, 42), and adding a second powder into a gap between the second film (12) and the other side surface (22) of the foil (2) to perform a second rolling to form a second powder laminated layer on the other side surface (22) of the foil (2);
3) the first film (11) and the second film (12) are separated from the side surfaces (21, 22) of the foil (2) respectively to obtain the electrode slice.
2. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein in step 1), after the first rolling, the first film is separated from the foil (2) by a guide roller (6);
preferably, in the step 1), the width of the first film is smaller than that of the foil, and more preferably, the width of the first film is 15% -90% of the width of the foil;
preferably, the width of the first roller is greater than or equal to the width of the first film material, and more preferably, the width of the first roller is 120-160% of the width of the first film material.
3. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein the foil is a copper foil, an aluminum foil, a nickel foil, a stainless steel foil or a zinc foil;
preferably, the foil has a thickness of 3-20 μm.
4. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein in the step 1), the particle size of the first powder is 0.5-20 μm;
preferably, the curing temperature of the first powder is 40-100 ℃;
preferably, the first powder material is a mixture of an active material, a binder and a conductive agent;
preferably, the first powder is preheated to 40-100 ℃ and then is added;
preferably, the first powder is added after premixing.
5. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein in the step 1), the working pressure of the first rolling is 30-75T/cm2；
Preferably, the working temperature of the first rolling is 90-180 ℃;
preferably, the feeding speed of the foil (2) is 1-50 m/min;
preferably, the feeding speed of the first film material (11) is 1-50 m/min.
6. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein in the step 2), the width of the second film is less than that of the foil, and more preferably, the width of the second film is 15-90% of the width of the foil;
preferably, the width of the second roller is greater than or equal to the width of the second film material, and more preferably, the width of the second roller is 120-160% of the width of the second film material.
7. The method for preparing the electrode sheet by dry rolling according to claim 1, wherein in the step 2), the particle size of the second powder is 0.5-20 μm;
preferably, the curing temperature of the second powder is 40-100 ℃;
preferably, the second powder is a mixture of an active substance, a binder and a conductive agent;
preferably, the second powder is preheated to 40-100 ℃ and then is added;
preferably, the second powder is premixed and then added.
8. The method for preparing an electrode sheet by dry rolling according to claim 1, wherein in the step 2), the working pressure of the second rolling is 30-75T/cm2；
Preferably, the working temperature of the second rolling is 90-180 ℃;
preferably, the feeding speed of the second film material (12) is 1-50 m/min.
9. The method for preparing the electrode sheet by dry rolling according to any one of claims 1 to 8, wherein the first film material is the same as the second film material;
preferably, the membrane material is a heat-resistant membrane material, and the heat-resistant temperature is higher than 180 ℃;
preferably, the film material is a PET, PI or PE film.
10. The method for producing an electrode sheet by dry rolling according to any one of claims 1 to 8, wherein the number of repetitions of the first rolling is 1 or more;
preferably, the second rolling is repeated 1 or more times.
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