WO2021233214A1 - Pole piece and preparation method therefor and lithium ion battery - Google Patents

Pole piece and preparation method therefor and lithium ion battery Download PDF

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Publication number
WO2021233214A1
WO2021233214A1 PCT/CN2021/093748 CN2021093748W WO2021233214A1 WO 2021233214 A1 WO2021233214 A1 WO 2021233214A1 CN 2021093748 W CN2021093748 W CN 2021093748W WO 2021233214 A1 WO2021233214 A1 WO 2021233214A1
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WIPO (PCT)
Prior art keywords
layer
collapsing
current collector
pole piece
electrode film
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PCT/CN2021/093748
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French (fr)
Chinese (zh)
Inventor
王汭
於洪将
邹武元
姜斌
Original Assignee
东莞塔菲尔新能源科技有限公司
江苏塔菲尔新能源科技股份有限公司
江苏塔菲尔动力系统有限公司
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Publication of WO2021233214A1 publication Critical patent/WO2021233214A1/en

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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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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

Definitions

  • the invention belongs to the technical field of batteries, and relates to a pole piece and a preparation method thereof and a lithium ion battery.
  • the energy density of lithium-ion power batteries is getting higher and higher.
  • the current collectors of lithium-ion batteries have also become thinner and thinner. The thinner the current collector, the correspondingly softer, which will bring difficulties in the production process.
  • the uncoated empty foil area at the edge of the diaphragm will have a problem of collapse and uncoated The larger the empty foil area, the more serious the collapse.
  • the collapse of the empty foil area not only affects production, but also causes the formed tabs to be folded into the cathode and anode pole pieces during the winding or lamination process, causing internal short circuits. risk.
  • CN100357057A discloses a method for improving the welding strength of the negative electrode tab of a lithium-ion square battery.
  • the battery cover of the lithium-ion square battery is fixed with a positive pole and a negative pole which are respectively connected to the positive and negative sheets of the battery pole group, and the negative pole.
  • the length is 10-16mm.
  • the positive electrode lug is welded to the battery cover plate (ie, the positive electrode) by ultrasonic welding, and the negative electrode lug is welded to the negative pole by resistance welding.
  • the positive electrode lug is welded first, and then the negative electrode lug is welded.
  • the welding sequence of welding the positive electrode lug first and then the negative electrode lug eliminates the impact of the vibration of the ultrasonic welding positive electrode lug on the welding strength of the negative electrode lug.
  • the lengthening of the negative electrode post ensures the welding position of the negative electrode lug.
  • CN205159413U discloses a high-strength lithium battery lug, comprising a lithium battery body and a lug.
  • the inner upper side of the battery body is provided with an inner electrode, the inner electrode is connected with the lug, and the lug includes a connecting post,
  • the connecting column penetrates the upper part of the lithium battery body, the upper part of the connecting column is fixedly connected with a conductive spring, and the upper part of the conductive spring is fixedly connected with the connecting metal sheet.
  • CN208580803U discloses a high-strength electrode plate for a lead-acid battery, comprising a plate body and a tab.
  • the plate body includes a grid and an active material layer coated on the surface of the grid.
  • the grid includes a grid frame and a set
  • the tabs of the upper frame of the grid frame and the grid strips fixed in the frame of the grid frame are provided with reinforcing ribs on both sides of the connection between the bottom of the tabs and the upper frame ribs.
  • the height formation slope is in a triangular structure, the grid frame is a rounded rectangular structure, and the corresponding four rounded corners are respectively provided with reinforcing ribs.
  • the reinforcing ribs include L-shaped ribs that form a fan-shaped structure with the rounded corners and The diagonal ribs connected at the ends of the L-shaped ribs.
  • the purpose of the present invention is to provide a pole piece, a preparation method thereof, and a lithium ion battery.
  • the pole piece provided by the present invention solves the problems of high rate of poor die-cutting of the pole piece and the folding of the pole piece during winding caused by the collapse of the edge of the pole piece.
  • the present invention adopts the following technical solutions:
  • the present invention provides a pole piece, the pole piece comprising a current collector, an electrode film layer and an anti-collapse layer, the electrode film layer is located on the current collector, the anti-collapse layer is located on the current collector and / Or on the electrode film layer.
  • the anti-collapsing layer by providing the anti-collapsing layer, it can play the role of supporting the empty foil area at the edge of the pole piece (that is, the area used to prepare the tab, which does not contain any coating), thereby solving the problem of the collapse of the edge of the pole piece. This causes a high rate of poor die-cutting of the tabs and the problem of tabs turning over during winding.
  • the anti-collapsing edge layer can be located on the current collector, or on the electrode film layer, or both on the current collector, and the edge of the anti-collapsing layer also extends to the electrode film layer.
  • the anti-collapsing coating can be a coating, and its color is not limited, for example, it can be black, gray, white, yellow, green, etc., or it can be colorless and transparent.
  • the electrode film layer and the anti-collapsing layer are both located on the current collector, and one side of the electrode film layer is in contact with one side of the anti-collapsing layer.
  • the electrode film layer and the anti-collapse edge layer are close to each other.
  • the anti-collapsing layer is located on the electrode film layer, and one side of the anti-collapsing layer is aligned with one side of the electrode film layer.
  • the anti-collapsing layer is located on one side of the electrode film layer.
  • a part of the anti-collapsing layer is located on the current collector, and the remaining part is located on the electrode film layer.
  • an anti-collapse edge layer is located at the junction of the current collector and the electrode film layer, and a part is located on the current collector, and the rest is located on the electrode film layer.
  • At least one side of the current collector is an empty foil area, and the empty foil area is not provided with an anti-collapsing layer and an electrode film layer.
  • the anti-collapsing edge layer should be close to or adjacent to the empty foil area.
  • the distance between the empty foil area and the anti-collapsing layer is not greater than the distance between the empty foil area and the electrode film layer.
  • the empty foil area is closer to the anti-collapsing layer, or at least the distance between the empty foil area and the anti-collapsing layer is the same as the distance from the electrode film layer.
  • the distance refers to the smallest value among the distances between the different positions of the edge of the empty foil area and the anti-collapsing layer or the electrode film layer.
  • the electrode film layer and the anti-collapsing layer are both located on one side of the current collector or the electrode film layer and the anti-collapsing layer are both located on both sides of the current collector.
  • the anti-collapse edge layer is continuous or discontinuous.
  • the anti-collapsing layer can be continuously coated on the edge of the pole piece or intermittently coated on the edge of the pole piece.
  • the current collector includes copper foil and/or aluminum foil.
  • the current collector may be a perforated current collector or an unperforated current collector.
  • the thickness of the current collector is 2 ⁇ m-20 ⁇ m, such as 2 ⁇ m, 4 ⁇ m, 6 ⁇ m, 8 ⁇ m, 10 ⁇ m, 12 ⁇ m, 14 ⁇ m, 16 ⁇ m, 18 ⁇ m, or 20 ⁇ m.
  • the current collector can be lighter and thinner, and this can also highlight the significance of the addition of the anti-collapsing layer used in the present invention, because the thin and light current collector is more likely to have tabs caused by the collapse of the edge of the pole piece. The high rate of die-cutting defects and the problems of the tabs turning over during winding.
  • the electrode film layer includes an electrode active material.
  • the electrode film layer may further include a conductive agent and/or a binder.
  • the pole piece is a positive electrode piece or a negative electrode piece. That is, 13.
  • the anti-collapsing coating can be coated/on the positive pole piece, it can also be coated/on the negative pole piece, or it can be coated/on both the positive and negative pole pieces at the same time.
  • the thickness of the anti-collapsing layer is 1-300 ⁇ m, such as 1 ⁇ m, 5 ⁇ m, 10 ⁇ m, 50 ⁇ m, 100 ⁇ m, 150 ⁇ m, 200 ⁇ m, 250 ⁇ m or 300 ⁇ m, etc., preferably 30-150 ⁇ m.
  • the thickness of the anti-collapsing coating is too thick, the thickness of the anti-collapsing coating will far exceed the thickness of the diaphragm, resulting in coating drum edges; if the thickness of the anti-collapsing coating is too thin, it will cause Can not achieve the effect of anti-collapsing or the effect is not obvious.
  • the width of the anti-collapsing layer is 1mm-20mm, for example, 1mm, 2mm, 3mm, 5mm, 10mm, 12mm, 15mm, 20mm, etc.
  • the width is mainly for regular polygons, the width refers to the TD direction during coating, the coating running direction is the MD direction, and the direction perpendicular to the MD is the TD direction.
  • the anti-collapsing layer is a non-porous layer or a porous layer.
  • the anti-collapsing layer is a porous layer, and the holes are any one or a combination of at least two of a circle, an ellipse, a square, a triangle, a polygon, or an irregular shape.
  • the anti-collapsing layer is a porous layer, and the holes are through holes and/or semi-through holes.
  • the anti-collapsing layer includes any one or a combination of at least two of conductors, semiconductors, insulators, and positive temperature coefficient materials.
  • the anti-collapsing layer includes polyvinylidene fluoride, polyurethane, sodium polyacrylate, styrene butadiene rubber, polyetherimide, carboxymethyl cellulose, acrylate, polyethylene terephthalate , Polybutylene terephthalate, polypropylene, polyethylene, silicon dioxide, silicon carbide, barium titanate, titanium oxide, or vanadium oxide, or a combination of at least two of them.
  • the above-mentioned material is the base material of the anti-collapsing layer, which can be a molten material or a small particle.
  • the above-mentioned vinylidene fluoride can be molten and mainly functions as a binder.
  • the anti-collapsing layer further includes particles.
  • the particles here refer to materials with a relatively large particle size, and the presence of large particles can be directly observed, which can act as a filler.
  • the particles include any one or a combination of at least two of polyvinylidene fluoride particles, alumina particles, boehmite particles, silicon oxide particles, vanadium oxide particles, silicon nitride particles, or silicon carbide particles.
  • the particle size of the particles is 0.1-100 ⁇ m, such as 0.1 ⁇ m, 5 ⁇ m, 10 ⁇ m, 50 ⁇ m, 75 ⁇ m, or 100 ⁇ m.
  • the present invention provides a method for preparing the pole piece as described in the first aspect, the method comprising the following steps:
  • the electrode film layer is coated on the current collector, and the anti-collapsing layer is prepared to obtain the pole piece.
  • the preparation method provided by the present invention is simple to operate, and the pole piece described in the first aspect can be prepared relatively easily.
  • the method for preparing the anti-collapsing layer includes any one or a combination of at least two of coating, spraying, sputtering, coating or deposition;
  • the method for preparing the anti-collapsing layer includes preparing the raw material of the anti-collapsing layer into a slurry and then coating.
  • the method for preparing the anti-collapsing layer further includes any one or a combination of at least two of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment. These methods are used to prepare the oxide layer, in which anodizing and sandblasting can be used to prepare the positive electrode current collector oxide layer, and ion treatment, heating roller treatment and laser treatment can be used to prepare the negative electrode current collector oxide layer.
  • the method includes the following steps:
  • the electrode film layer is coated on the current collector to prepare the anti-collapsing layer to obtain the pole piece; wherein, the method for preparing the anti-collapsing layer includes any one of coating, spraying, sputtering, coating or deposition One or a combination of at least two; when the anti-collapsing layer includes oxide, the method for preparing the anti-collapsing layer further includes any one of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment Or a combination of at least two to perform oxidation.
  • the present invention provides a lithium ion battery comprising the pole piece as described in the first aspect.
  • the present invention has the following beneficial effects:
  • the anti-collapsing layer can effectively support the edge of the current collector, reducing the abnormal die-cutting of the tab due to the collapse of the pole piece edge and the problem of the tab turning over during the winding process. .
  • the abnormality rate of die-cutting of the pole lug is below 0.9%, and the turning-over rate of the winding pole is below 2.1%.
  • Fig. 1 is a schematic top view of a pole piece provided in embodiment 1;
  • Embodiment 2 is a schematic side view of the pole piece provided in Embodiment 1;
  • Example 3 is a schematic top view of the pole piece provided in Example 1 after the tab is prepared;
  • Embodiment 4 is a schematic side view of the pole piece provided in Embodiment 4.
  • Fig. 5 is a schematic side view of a pole piece provided in embodiment 5;
  • FIG. 6 is a schematic top view of a pole piece provided in Embodiment 6;
  • 1-current collector 2-anti-collapsing layer
  • 3-electrode film layer 4- tabs, W in the figure shows the width of the anti-collapsing layer.
  • the pole piece was prepared according to the following method:
  • the positive electrode slurry was continuously coated on the surface of the positive electrode current collector with a thickness of 9 ⁇ m to form a film area with a width of 165 mm and a thickness of 155 ⁇ m; the PVDF solution was coated on the surface of the current collector next to the film area to form a thickness of 10 ⁇ m, 15mm width anti-collapsing coating;
  • the coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
  • the coated film is dried, rolled, die-cut, and slit to prepare a negative pole piece.
  • Fig. 1 is a schematic top view of the pole piece provided in this embodiment. As shown in Fig. 1, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the pole tab.
  • Figure 2 is a schematic side view of the pole piece provided in this embodiment. It can be seen that both sides of the current collector 1 are coated with an electrode film layer 3 and an anti-collapsing layer 2, and each side of the current collector 1 is anti-collapsing
  • FIG. 3 is a schematic top view of the pole piece of this embodiment after the tab 4 is prepared, and the tab 4 is die-cut from the empty foil area.
  • FIG. 1, FIG. 2 and FIG. 3 are all applicable to the structure of the positive electrode and the negative electrode of the first embodiment.
  • the positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1, and on both sides of the current collector 1. Both have an anti-collapsing layer 2 and an electrode film layer 3.
  • the electrode film layer 3 on the same surface of the current collector 1 and the anti-collapsing layer 2 have one side connected, and the current collector 1 is not covered by the electrode film layer 3 and the anti-collapsing layer
  • the area covered by 2 is an empty foil area, which is used to prepare tabs 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapsing layer 2 is 15 mm and the thickness is 30 ⁇ m.
  • the anti-collapsing side layer 2 has no holes.
  • the anti-collapsing layer 2 is mainly composed of PVDF.
  • the positive electrode current collector 1 is an aluminum foil with a thickness of 12 m.
  • the negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1, and both sides of the current collector 1. Both have an anti-collapsing layer 2 and an electrode film layer 3.
  • the electrode film layer 3 on the same surface of the current collector 1 and the anti-collapsing layer 2 have one side connected, and the current collector 1 is not covered by the electrode film layer 3 and the anti-collapsing layer
  • the area covered by 2 is an empty foil area, which is used to prepare tabs 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapsing layer 2 is 15 mm and the thickness is 40 ⁇ m.
  • the anti-collapsing side layer 2 has no holes.
  • the anti-collapsing layer 2 is mainly composed of PVDF.
  • the negative electrode current collector 1 is a copper foil with a thickness of 6 ⁇ m
  • This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
  • the positive pole piece and negative pole piece prepared according to the foregoing process are formed by die-cutting process to form the tabs and the separator in the manner of: negative electrode-separator-positive electrode-separator to be wound into a bare cell; the winding will be completed After hot pressing, the bare cell is assembled with the top cover shell and welded together to complete the cell assembly. Finally, the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
  • the pole piece was prepared according to the following method:
  • the negative electrode film obtained above is dried, rolled, die-cut, and slit to prepare a negative electrode sheet.
  • the negative pole piece structure of this embodiment refers to the negative pole piece of Example 1.
  • the negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the anti-collapsing layer 2 and The electrode film layer 3 is located on the current collector 1, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1.
  • the electrode film layer 3 on the same side of the current collector 1 and the anti-collapsing layer 2 have one side opposite to each other. Then, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapse layer 2 is 15 mm and the thickness is 10 ⁇ m.
  • the anti-collapse edge layer 2 has a porous structure.
  • the anti-collapsing layer 2 is mainly composed of PVDF and Al2O3.
  • the negative electrode current collector 1 is a copper foil with a thickness of 6 ⁇ m.
  • This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
  • the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
  • the pole piece was prepared according to the following method:
  • the negative pole piece structure of this embodiment refers to the negative pole piece of Example 1.
  • the negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the anti-collapsing layer 2 and The electrode film layer 3 is located on the current collector 1, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1.
  • the electrode film layer 3 on the same side of the current collector 1 and the anti-collapsing layer 2 have one side opposite to each other. Then, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapsing layer 2 is 12 mm and the thickness is 10 ⁇ m.
  • the anti-collapsing side layer 2 has no holes.
  • the anti-collapsing layer 2 is mainly composed of PP.
  • the negative electrode current collector 1 is a copper foil with a thickness of 4.5 ⁇ m.
  • This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
  • the battery cell is manufactured through processes such as liquid injection, chemical conversion, exhaust, and sealing, etc., to obtain a lithium-ion battery.
  • the pole piece was prepared according to the following method:
  • the positive electrode slurry is continuously coated on the surface of the positive electrode current collector with a thickness of 9 ⁇ m to form an electrode membrane area with a width of 165mm and a thickness of 155 ⁇ m; PVDF and boehmite solution are coated on the electrode membrane area next to the empty foil area Form the anti-collapsing coating with a thickness of 100 ⁇ m and a width of 10mm;
  • the coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
  • the positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the electrode film layers 3 are all located on the current collector 1, and the anti-collapsing layer 2 is located on the electrode film layer 3, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1.
  • the area on 1 that is not covered by the electrode film layer 3 is an empty foil area, which is used to prepare the tab 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapse layer 2 is 10 mm and the thickness is 100 ⁇ m.
  • the anti-collapsing layer has holes, including through holes and semi-through holes, and the hole shapes are mainly circular and elliptical.
  • the anti-collapsing layer 2 is mainly composed of PVDF and boehmite particles.
  • the positive electrode current collector 1 is an aluminum foil with a thickness of 10 ⁇ m.
  • This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
  • the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
  • the pole piece was prepared according to the following method:
  • the coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
  • the positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the electrode film layers 3 are all located on the current collector 1, and the anti-collapsing layer 2 is located on the current collector 1 and the electrode film layer 3, and only one side of the current collector 1 has the anti-collapsing layer 2 and the electrode film layer 3, and the current collector 1 is not covered by the electrode film layer 3 and the electrode film layer 2
  • the area is an empty foil area, which is used to prepare tabs 4.
  • the anti-collapse side layer 2 is continuous.
  • the width W of the anti-collapsing layer 2 is 12 mm and the thickness is 300 ⁇ m.
  • the anti-collapsing layer has holes, including through holes and semi-through holes, and the hole shapes are mainly circular, elliptical and polygonal.
  • the anti-collapsing layer 2 is mainly composed of PVDF and silicon nitride particles.
  • the positive electrode current collector 1 is an aluminum foil with a thickness of 10 ⁇ m.
  • the positive pole piece prepared in this example was used to prepare a lithium ion battery.
  • the pole piece was prepared according to the following method:
  • the anti-collapsing coating in step (2) is not continuous, but has two discontinuous positions, consisting of three parts of the anti-collapsing layer, and two adjacent parts of the anti-collapsing layer The distance between them is 1mm.
  • the negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2.
  • the anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1. And there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1.
  • the electrode film layer 3 on the same side of the collector 1 and the anti-collapsing layer 2 have one side connected, and there is no electrode film layer on the current collector 1.
  • the area covered by 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4.
  • the anti-collapsing layer 2 is discontinuous and consists of three parts, and the distance between two adjacent parts is 1 mm.
  • the width W of the anti-collapsing layer 2 is 15 ⁇ m and the thickness is 10 ⁇ m.
  • the anti-collapsing side layer 2 has no holes.
  • the anti-collapsing layer 2 is mainly composed of PVDF.
  • the negative electrode current collector 1 is a copper foil with a thickness of 12 ⁇ m.
  • the negative pole piece prepared in this example was used to prepare a lithium ion battery.
  • the positive electrode and the negative electrode provided in this comparative example are the same as the positive electrode and the negative electrode of Example 1, except that neither of them use the anti-collapsing layer.
  • the negative electrode provided in this comparative example does not use the anti-collapsing layer, and other materials and structures are the same as those of the negative electrode of Example 2.
  • the negative electrode provided in this comparative example does not use the anti-collapsing layer, and other materials and structures are the same as those of the negative electrode of Example 3.
  • the cell production of each embodiment and comparative example was carried out on the cell pilot test line, and the die-cutting abnormality and the tab turning rate were counted, and 10,000 samples were counted for each type of pole piece.
  • the abnormality of the die-cutting of the tab refers to the condition that the primary selection is continuous during die-cutting or the tab is damaged during the die-cutting process.
  • the turn-over rate of the winding machine refers to the probability of the tabs turning over and being rolled into the bare cell during the winding process.
  • the embodiment adopts the anti-collapsing layer, which can effectively support the edge of the current collector, and reduce the abnormal die-cutting of the tab due to the collapse of the pole piece edge and the tab turning during the winding process. Fold problem.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

Provided are a pole piece and a preparation method therefor and a lithium ion battery. The pole piece comprises a current collector (1), an electrode film layer (3) and an anti-collapse edge layer (2), wherein the electrode film layer (3) is located on the current collector; and the anti-collapse edge layer (2) is located on the current collector (1) and/or the electrode film layer (3). The preparation method comprises: coating the current collector (1) with the electrode film layer (3), and preparing the anti-collapse edge layer (2) to obtain the pole piece, wherein the anti-collapse edge layer (2) can effectively support the edge of the current collector (1); and the problems of abnormal die cutting of a tab (4) caused by the collapse of the edge of the pole piece and the turning over of the tab (4) during a winding process are reduced.

Description

一种极片及其制备方法和锂离子电池Pole piece and preparation method thereof and lithium ion battery
本申请要求于2020年5月19日提交中国专利局、申请号为202010424013.7、发明名称为“一种极片及其制备方法和锂离子电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 19, 2020, the application number is 202010424013.7, and the invention title is "a pole piece and its preparation method and lithium ion battery", the entire content of which is by reference Incorporated in this application.
技术领域Technical field
本发明属于电池技术领域，涉及一种极片及其制备方法和锂离子电池。The invention belongs to the technical field of batteries, and relates to a pole piece and a preparation method thereof and a lithium ion battery.
背景技术Background technique
随着电动汽车的不断普及以及电动汽车对续航里程需求的不断提升，锂离子动力电池的能量密度越做越高。为了追求更高的能量密度，锂离子电池的集流体也做得越来越薄。集流体越薄，也就相应的越软，这样会带来生产过程中的难度，例如在涂覆过程中，膜片边缘未涂覆的空箔区就会存在下塌问题，并且未涂覆的空箔区越大，下塌也就越严重。With the continuous popularization of electric vehicles and the increasing demand of electric vehicles for cruising range, the energy density of lithium-ion power batteries is getting higher and higher. In pursuit of higher energy density, the current collectors of lithium-ion batteries have also become thinner and thinner. The thinner the current collector, the correspondingly softer, which will bring difficulties in the production process. For example, during the coating process, the uncoated empty foil area at the edge of the diaphragm will have a problem of collapse and uncoated The larger the empty foil area, the more serious the collapse.
对于要采用极耳成型工艺生产的电芯来说，空箔区下塌不但影响生产，还好造成成型的极耳在卷绕或者叠片过程中被折叠到阴阳极极片中，引发内短路风险。For batteries to be produced by the tab forming process, the collapse of the empty foil area not only affects production, but also causes the formed tabs to be folded into the cathode and anode pole pieces during the winding or lamination process, causing internal short circuits. risk.
CN100357057A公开了改善锂离子方形电池负极耳焊接强度的方法，该方案中，锂离子方形电池的电池盖上固定有分别与电池极组的正极片和负极片相连的正极柱和负极柱，负极柱长度为10～16mm，采用超声焊方法将正极耳焊接在电池盖板上(即正极)，利用电阻焊将负极耳焊接在负极柱上，先焊接正极耳，再焊接负极耳。采用先焊接正极耳再焊接负极耳的焊接顺序，消除了超声焊法焊接正极耳的震动对负极耳焊接强度的影响，由于加长了负极柱，使负极耳的焊接位置得以保证。CN100357057A discloses a method for improving the welding strength of the negative electrode tab of a lithium-ion square battery. In this scheme, the battery cover of the lithium-ion square battery is fixed with a positive pole and a negative pole which are respectively connected to the positive and negative sheets of the battery pole group, and the negative pole. The length is 10-16mm. The positive electrode lug is welded to the battery cover plate (ie, the positive electrode) by ultrasonic welding, and the negative electrode lug is welded to the negative pole by resistance welding. The positive electrode lug is welded first, and then the negative electrode lug is welded. The welding sequence of welding the positive electrode lug first and then the negative electrode lug eliminates the impact of the vibration of the ultrasonic welding positive electrode lug on the welding strength of the negative electrode lug. The lengthening of the negative electrode post ensures the welding position of the negative electrode lug.
CN205159413U公开了一种高强度锂电池极耳，包括锂电池本体和极耳，所述电池本体的内部上侧设有内电极，所述内电极与极耳连接，所述极耳包括连接柱，所述连接柱与锂电池本体的上部贯穿，所述连接柱的上部固定连接有导电弹簧，所述导电弹簧的上部与连接金属片固定连接。CN205159413U discloses a high-strength lithium battery lug, comprising a lithium battery body and a lug. The inner upper side of the battery body is provided with an inner electrode, the inner electrode is connected with the lug, and the lug includes a connecting post, The connecting column penetrates the upper part of the lithium battery body, the upper part of the connecting column is fixedly connected with a conductive spring, and the upper part of the conductive spring is fixedly connected with the connecting metal sheet.
CN208580803U公开了一种铅酸蓄电池用高强度极板，包括极板本体和极耳，极板本体包括板栅和涂覆于板栅表面的活性物质层，所述板栅包括板栅边框、设置在板栅边框上边框的极耳和固定在板栅边框内的板栅条，所述极耳底部与上框筋连接处两侧设有加强筋，加强筋延极耳向上框筋两侧递减高度形成斜面呈三角形结构，所述板栅边框为圆角矩形结构，其对应的四个圆角内分别设置有加强筋条，加强筋条包括与圆角构成扇形结构的L型筋条和与L型筋条端点处连接的斜向筋条。CN208580803U discloses a high-strength electrode plate for a lead-acid battery, comprising a plate body and a tab. The plate body includes a grid and an active material layer coated on the surface of the grid. The grid includes a grid frame and a set The tabs of the upper frame of the grid frame and the grid strips fixed in the frame of the grid frame are provided with reinforcing ribs on both sides of the connection between the bottom of the tabs and the upper frame ribs. The height formation slope is in a triangular structure, the grid frame is a rounded rectangular structure, and the corresponding four rounded corners are respectively provided with reinforcing ribs. The reinforcing ribs include L-shaped ribs that form a fan-shaped structure with the rounded corners and The diagonal ribs connected at the ends of the L-shaped ribs.
虽然上述方法采用种种方法以提高极片强度，但是都无法有效解决使用薄基材时由于极片边缘下塌而造成的极耳模切不良率高以及卷绕时极耳翻折的问题。Although the above methods adopt various methods to improve the strength of the pole piece, they cannot effectively solve the problems of high die-cutting failure rate of the pole piece caused by the collapse of the edge of the pole piece when a thin substrate is used, and the problem of the pole piece turning over during winding.
发明内容Summary of the invention
针对现有技术中存在的上述不足，本发明的目的在于提供一种极片及其制备方法和锂离子电池。本发明提供的极片解决了由于极片边缘下塌而造成的极耳模切不良率高以及卷绕时极耳翻折问题。In view of the above-mentioned shortcomings in the prior art, the purpose of the present invention is to provide a pole piece, a preparation method thereof, and a lithium ion battery. The pole piece provided by the present invention solves the problems of high rate of poor die-cutting of the pole piece and the folding of the pole piece during winding caused by the collapse of the edge of the pole piece.
为达此目的，本发明采用以下技术方案：To achieve this goal, the present invention adopts the following technical solutions:
第一方面，本发明提供一种极片，所述极片包括集流体、电极膜层和防塌边层，所述电极膜层位于集流体上，所述防塌边层位于集流体上和/或电极膜层上。In a first aspect, the present invention provides a pole piece, the pole piece comprising a current collector, an electrode film layer and an anti-collapse layer, the electrode film layer is located on the current collector, the anti-collapse layer is located on the current collector and / Or on the electrode film layer.
本发明中，通过设置防塌边层，可以起到支撑极片边缘空箔区(即用于制备极耳的区域，该区域不含任何涂层)的作用，进而解决由于极片边缘下塌而造成的极耳模切不良率高以及卷绕时极耳翻折问题。In the present invention, by providing the anti-collapsing layer, it can play the role of supporting the empty foil area at the edge of the pole piece (that is, the area used to prepare the tab, which does not contain any coating), thereby solving the problem of the collapse of the edge of the pole piece. This causes a high rate of poor die-cutting of the tabs and the problem of tabs turning over during winding.
本发明中，防塌边层可以位于集流体上，也可以位于电极膜层上，还可以既位于集流体上，防塌边层的边缘还延伸到电极膜层上。In the present invention, the anti-collapsing edge layer can be located on the current collector, or on the electrode film layer, or both on the current collector, and the edge of the anti-collapsing layer also extends to the electrode film layer.
本发明中，防塌边涂层可以为涂层，其颜色不限，如可以为黑色、灰色、白色、黄色、绿色等，也可以是无色透明的。In the present invention, the anti-collapsing coating can be a coating, and its color is not limited, for example, it can be black, gray, white, yellow, green, etc., or it can be colorless and transparent.
以下作为本发明优选的技术方案，但不作为对本发明提供的技术方案的限制，通过以下优选的技术方案，可以更好的达到和实现本发明的技术目的和有益效果。The following are preferred technical solutions of the present invention, but not as limitations on the technical solutions provided by the present invention. Through the following preferred technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.
作为本发明优选的技术方案，所述电极膜层和防塌边层均位于集流体上，所述电极膜层的一边与防塌边层的一边相接。As a preferred technical solution of the present invention, the electrode film layer and the anti-collapsing layer are both located on the current collector, and one side of the electrode film layer is in contact with one side of the anti-collapsing layer.
即，电极膜层和防塌边层紧挨着。That is, the electrode film layer and the anti-collapse edge layer are close to each other.
优选地，所述防塌边层位于电极膜层上，所述防塌边层的一边与电极膜层的一边对齐。Preferably, the anti-collapsing layer is located on the electrode film layer, and one side of the anti-collapsing layer is aligned with one side of the electrode film layer.
即，防塌边层位于电极膜层的一个边上。That is, the anti-collapsing layer is located on one side of the electrode film layer.
优选地，所述防塌边层一部分位于集流体上，其余部分位于电极膜层上。Preferably, a part of the anti-collapsing layer is located on the current collector, and the remaining part is located on the electrode film layer.
即，一个防塌边层位于集流体和电极膜层的交界处，且一部分位于于集流体上，其余部分位于电极膜层上。That is, an anti-collapse edge layer is located at the junction of the current collector and the electrode film layer, and a part is located on the current collector, and the rest is located on the electrode film layer.
优选地，所述集流体的至少一边为空箔区，所述空箔区上不设有防塌边层和电极膜层。Preferably, at least one side of the current collector is an empty foil area, and the empty foil area is not provided with an anti-collapsing layer and an electrode film layer.
本发明中，所述空箔区上没有任何附加的材料层，空箔区的用途是用来制备极耳。因此，防塌边层应该是靠近或紧邻空箔区的。In the present invention, there is no additional material layer on the empty foil area, and the purpose of the empty foil area is to prepare tabs. Therefore, the anti-collapsing edge layer should be close to or adjacent to the empty foil area.
优选地，所述空箔区与防塌边层的距离不大于所述空箔区与电极膜层的距离。Preferably, the distance between the empty foil area and the anti-collapsing layer is not greater than the distance between the empty foil area and the electrode film layer.
即空箔区更靠近防塌边层，或者至少空箔区距离防塌边层的距离与距离电极膜层的距离相同。所述距离，是指空箔区边缘的不同位置与防塌边层或电极膜层的距离中数值最小的那个距离值。That is, the empty foil area is closer to the anti-collapsing layer, or at least the distance between the empty foil area and the anti-collapsing layer is the same as the distance from the electrode film layer. The distance refers to the smallest value among the distances between the different positions of the edge of the empty foil area and the anti-collapsing layer or the electrode film layer.
优选地，所述电极膜层和防塌边层均位于集流体的一面或所述电极膜层和防塌边层均位于集流体的两面。Preferably, the electrode film layer and the anti-collapsing layer are both located on one side of the current collector or the electrode film layer and the anti-collapsing layer are both located on both sides of the current collector.
优选地，所述防塌边层为连续的或间断的。Preferably, the anti-collapse edge layer is continuous or discontinuous.
即，防塌边层可以连续涂覆在极片边缘，也可以间歇涂覆在极片边缘。That is, the anti-collapsing layer can be continuously coated on the edge of the pole piece or intermittently coated on the edge of the pole piece.
作为本发明优选的技术方案，所述集流体包括铜箔和/或铝箔。As a preferred technical solution of the present invention, the current collector includes copper foil and/or aluminum foil.
本发明中，集流体可以为打孔的集流体，也可以为未打孔的集流体。In the present invention, the current collector may be a perforated current collector or an unperforated current collector.
优选地，所述集流体的厚度为2μm-20μm，例如2μm、4μm、6μm、8μm、10μm、12μm、14μm、16μm、18μm或20μm等。在该厚度范围内，集流体可以更加轻薄，而这也可以更加凸显本发明采用的添加防塌边层的重大意义，因为轻薄的集流体更容易出现由于极片边缘下塌而 造成的极耳模切不良率高以及卷绕时极耳翻折的问题。Preferably, the thickness of the current collector is 2 μm-20 μm, such as 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, or 20 μm. Within this thickness range, the current collector can be lighter and thinner, and this can also highlight the significance of the addition of the anti-collapsing layer used in the present invention, because the thin and light current collector is more likely to have tabs caused by the collapse of the edge of the pole piece. The high rate of die-cutting defects and the problems of the tabs turning over during winding.
优选地，所述电极膜层包括电极活性物质。所述电极膜层还可以包括导电剂和/或粘结剂。Preferably, the electrode film layer includes an electrode active material. The electrode film layer may further include a conductive agent and/or a binder.
优选地，所述极片为正极片或负极片。即，13.防塌边涂层可以涂覆/在正极极片，也可以涂覆/在负极极片，也可以同时涂覆/在正极和负极极片上。Preferably, the pole piece is a positive electrode piece or a negative electrode piece. That is, 13. The anti-collapsing coating can be coated/on the positive pole piece, it can also be coated/on the negative pole piece, or it can be coated/on both the positive and negative pole pieces at the same time.
作为本发明优选的技术方案，所述防塌边层的厚度为1-300μm，例如1μm、5μm、10μm、50μm、100μm、150μm、200μm、250μm或300μm等，优选为30-150μm。本发明中，如果防塌边涂层的厚度过厚，会导致防塌边涂层的厚度远超过膜片厚度，从而造成涂布鼓边；如果防塌边涂层的厚度过薄，会导致无法起到防塌边的效果或者效果不明显。As a preferred technical solution of the present invention, the thickness of the anti-collapsing layer is 1-300 μm, such as 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm, etc., preferably 30-150 μm. In the present invention, if the thickness of the anti-collapsing coating is too thick, the thickness of the anti-collapsing coating will far exceed the thickness of the diaphragm, resulting in coating drum edges; if the thickness of the anti-collapsing coating is too thin, it will cause Can not achieve the effect of anti-collapsing or the effect is not obvious.
优选地，所述防塌边层的宽度为1mm-20mm，例如1mm、2mm、3mm、5mm、10mm、12mm、15mm、20mm、等。本发明中，所述宽度主要是针对规则多边形的，所述宽度是指涂布时的TD方向，涂布走带方向是MD方向，垂直于MD的方向就是TD方向。Preferably, the width of the anti-collapsing layer is 1mm-20mm, for example, 1mm, 2mm, 3mm, 5mm, 10mm, 12mm, 15mm, 20mm, etc. In the present invention, the width is mainly for regular polygons, the width refers to the TD direction during coating, the coating running direction is the MD direction, and the direction perpendicular to the MD is the TD direction.
优选地，所述防塌边层为无孔层或多孔层。Preferably, the anti-collapsing layer is a non-porous layer or a porous layer.
优选地，所述防塌边层为多孔层，所述孔为圆形、椭圆、方形、三角形、多边形或不规则形状中的任意一种或至少两种的组合。Preferably, the anti-collapsing layer is a porous layer, and the holes are any one or a combination of at least two of a circle, an ellipse, a square, a triangle, a polygon, or an irregular shape.
优选地，所述防塌边层为多孔层，所述孔为通孔和/或半通孔。Preferably, the anti-collapsing layer is a porous layer, and the holes are through holes and/or semi-through holes.
作为本发明优选的技术方案，所述防塌边层中包括导体、半导体、绝缘体或正温度系数材料中任意一种或至少两种的组合。As a preferred technical solution of the present invention, the anti-collapsing layer includes any one or a combination of at least two of conductors, semiconductors, insulators, and positive temperature coefficient materials.
优选地，所述防塌边层中包括聚偏氟乙烯、聚氨酯、聚丙烯酸钠、丁苯橡胶、聚醚酰亚胺、羧甲基纤维素、丙烯酸酯、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二酯、聚丙烯、聚乙烯、二氧化硅、碳化硅、钛酸钡、氧化钛或氧化钒中的任意一种或至少两种的组合。上述材料是防塌边层的基体材料，可以是熔融后的材料，也可以是微小的颗粒，例如上述偏聚氟乙烯即可是熔融后的，主要起到粘结剂作用。Preferably, the anti-collapsing layer includes polyvinylidene fluoride, polyurethane, sodium polyacrylate, styrene butadiene rubber, polyetherimide, carboxymethyl cellulose, acrylate, polyethylene terephthalate , Polybutylene terephthalate, polypropylene, polyethylene, silicon dioxide, silicon carbide, barium titanate, titanium oxide, or vanadium oxide, or a combination of at least two of them. The above-mentioned material is the base material of the anti-collapsing layer, which can be a molten material or a small particle. For example, the above-mentioned vinylidene fluoride can be molten and mainly functions as a binder.
优选地，所述防塌边层中还包括颗粒。这里的颗粒是指粒径比较大的材料，能直接观测到大颗粒的存在，可起到填充物的作用。Preferably, the anti-collapsing layer further includes particles. The particles here refer to materials with a relatively large particle size, and the presence of large particles can be directly observed, which can act as a filler.
优选地，所述颗粒包括聚偏氟乙烯颗粒、氧化铝颗粒、勃姆石颗粒、氧化硅颗粒、氧化钒颗粒、氮化硅颗粒或碳化硅颗粒中的任意一种或至少两种的组合。Preferably, the particles include any one or a combination of at least two of polyvinylidene fluoride particles, alumina particles, boehmite particles, silicon oxide particles, vanadium oxide particles, silicon nitride particles, or silicon carbide particles.
优选地，所述颗粒的粒径为0.1-100μm，例如0.1μm、5μm、10μm、50μm、75μm或100μm等。Preferably, the particle size of the particles is 0.1-100 μm, such as 0.1 μm, 5 μm, 10 μm, 50 μm, 75 μm, or 100 μm.
第二方面，本发明提供一种如第一方面所述极片的制备方法，所述方法包括以下步骤：In the second aspect, the present invention provides a method for preparing the pole piece as described in the first aspect, the method comprising the following steps:
在集流体上涂覆电极膜层，进行防塌边层制备，得到所述极片。The electrode film layer is coated on the current collector, and the anti-collapsing layer is prepared to obtain the pole piece.
本发明提供的制备方法操作简单，可以比较容易地制备出第一方面所述的极片。The preparation method provided by the present invention is simple to operate, and the pole piece described in the first aspect can be prepared relatively easily.
作为本发明优选的技术方案，所述进行防塌边层制备的方法包括涂覆、喷涂、溅射、镀膜或沉积中的任意一种或至少两种的组合；As a preferred technical solution of the present invention, the method for preparing the anti-collapsing layer includes any one or a combination of at least two of coating, spraying, sputtering, coating or deposition;
优选地，所述进行防塌边层制备的方法包括将防塌边层的原料制备成浆料后进行涂覆。Preferably, the method for preparing the anti-collapsing layer includes preparing the raw material of the anti-collapsing layer into a slurry and then coating.
作为本发明优选的技术方案，所述进行防塌边层制备的方法还包括阳极氧化、喷砂、等离子处理、加热辊处理或激光处理中的任意一种或至少两种的组合。这些方法是用来制备氧化层的，其中阳极氧化和喷砂可以用于制备正极集流体氧化层，离子处理、加热辊处理和激光处理可用来制备负极集流体氧化层。As a preferred technical solution of the present invention, the method for preparing the anti-collapsing layer further includes any one or a combination of at least two of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment. These methods are used to prepare the oxide layer, in which anodizing and sandblasting can be used to prepare the positive electrode current collector oxide layer, and ion treatment, heating roller treatment and laser treatment can be used to prepare the negative electrode current collector oxide layer.
作为本发明所述制备方法的进一步优选技术方案，所述方法包括以下步骤：As a further preferred technical solution of the preparation method of the present invention, the method includes the following steps:
在集流体上涂覆电极膜层，进行防塌边层制备，得到所述极片；其中，所述防塌边层制备的方法包括涂覆、喷涂、溅射、镀膜或沉积中的任意一种或至少两种的组合；所述防塌边层中包括氧化物时，所述防塌边层制备的方法还包括阳极氧化、喷砂、等离子处理、加热辊处理或激光处理中的任意一种或至少两种的组合以进行氧化。The electrode film layer is coated on the current collector to prepare the anti-collapsing layer to obtain the pole piece; wherein, the method for preparing the anti-collapsing layer includes any one of coating, spraying, sputtering, coating or deposition One or a combination of at least two; when the anti-collapsing layer includes oxide, the method for preparing the anti-collapsing layer further includes any one of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment Or a combination of at least two to perform oxidation.
第三方面，本发明提供一种锂离子电池，所述锂离子电池包含如第一方面所述的极片。In a third aspect, the present invention provides a lithium ion battery comprising the pole piece as described in the first aspect.
与已有技术相比，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
(1)本发明提供的极片中，防塌边层可以有效对集流体边缘起到支撑作用，减少由于极片边缘塌边造成的极耳模切异常以及卷绕过程中极耳翻折问题。本发明提供的极片，其极耳模切异常率在0.9％以下，卷绕极耳翻折率在2.1％以下。(1) In the pole piece provided by the present invention, the anti-collapsing layer can effectively support the edge of the current collector, reducing the abnormal die-cutting of the tab due to the collapse of the pole piece edge and the problem of the tab turning over during the winding process. . In the pole piece provided by the present invention, the abnormality rate of die-cutting of the pole lug is below 0.9%, and the turning-over rate of the winding pole is below 2.1%.
(2)本发明提供的制备方法操作简单，可以比较容易地制备出本发明所述的极片。(2) The preparation method provided by the present invention is simple to operate, and the pole piece of the present invention can be prepared relatively easily.
附图说明Description of the drawings
图1为实施例1提供的极片的俯视示意图；Fig. 1 is a schematic top view of a pole piece provided in embodiment 1;
图2为实施例1提供的极片的侧视示意图；2 is a schematic side view of the pole piece provided in Embodiment 1;
图3为实施例1提供的极片制备出极耳后的俯视示意图；3 is a schematic top view of the pole piece provided in Example 1 after the tab is prepared;
图4为实施例4提供的极片的侧视示意图；4 is a schematic side view of the pole piece provided in Embodiment 4;
图5为实施例5提供的极片的侧视示意图；Fig. 5 is a schematic side view of a pole piece provided in embodiment 5;
图6为实施例6提供的极片的俯视示意图；6 is a schematic top view of a pole piece provided in Embodiment 6;
其中，1-集流体，2-防塌边层，3-电极膜层，4-极耳，图中的W显示的是防塌边层的宽度。Among them, 1-current collector, 2-anti-collapsing layer, 3-electrode film layer, 4- tabs, W in the figure shows the width of the anti-collapsing layer.
具体实施方式Detailed ways
下面通过具体实施方式来进一步说明本发明的技术方案。但下述的实施例仅仅是本发明的简易例子，并不代表或限制本发明的权利保护范围，本发明保护范围以权利要求书为准。The technical solution of the present invention will be further explained by specific embodiments below. However, the following embodiments are only simple examples of the present invention, and do not represent or limit the protection scope of the present invention. The protection scope of the present invention is subject to the claims.
实施例1Example 1
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
正极：positive electrode:
(1)以三元材料作为正极活性材料，以炭黑作为导电剂，以聚偏氟乙烯作为粘结剂，以N-甲基吡咯烷酮(NMP)作为溶剂，再将上述材料按照正极材料：炭黑：聚偏氟乙烯＝96:2.5:1.5搅拌混合均匀形成固含量为70％的正极浆料；(1) Use ternary material as the positive electrode active material, carbon black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone (NMP) as the solvent, and then use the above-mentioned materials as the positive electrode material: carbon Black: Polyvinylidene fluoride=96:2.5:1.5, stir and mix evenly to form a positive electrode slurry with a solid content of 70%;
(2)将PVDF与NMP按照1:20的比例混合，制成PVDF溶液；(2) Mix PVDF and NMP according to the ratio of 1:20 to make PVDF solution;
(3)将正极浆料连续涂布在厚度为9μm的正极集流体表面，形成宽度为宽165mm，厚度为155μm的膜区；PVDF溶液涂覆在集流体表面紧邻膜区的位置，形成厚度为10μm，宽度为15mm的防塌边涂层；(3) The positive electrode slurry was continuously coated on the surface of the positive electrode current collector with a thickness of 9 μm to form a film area with a width of 165 mm and a thickness of 155 μm; the PVDF solution was coated on the surface of the current collector next to the film area to form a thickness of 10μm, 15mm width anti-collapsing coating;
(4)将涂覆好的膜片经过烘干、辊压、模切、分条制备成正极极片。(4) The coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
负极：negative electrode:
(1)以石墨作为负极活性物质，以丁苯橡胶作为粘结剂，炭黑作为导电剂，羧甲基纤维素钠作为分散剂，以蒸馏水作为溶剂，将上述原料按照石墨：丁苯橡胶：炭黑：羧甲基纤维素钠＝96:1.5:1.5:1搅拌混合均匀，形成固含量为45％的负极浆料；(1) Use graphite as the negative electrode active material, use styrene-butadiene rubber as the binder, carbon black as the conductive agent, sodium carboxymethyl cellulose as the dispersant, and distilled water as the solvent. Carbon black: sodium carboxymethyl cellulose=96:1.5:1.5:1, stir and mix evenly to form a negative electrode slurry with a solid content of 45%;
(2)将负极浆料涂布在厚度为4.5μm负极集流体铜箔表面，形成宽度为175mm，厚度为120μm的膜区；PVDF溶液涂覆在集流体表面紧邻膜区的位置，形成厚度为10μm，宽度为15μm的连续防塌边涂层；(2) Coat the negative electrode slurry on the surface of the negative current collector copper foil with a thickness of 4.5μm to form a film area with a width of 175mm and a thickness of 120μm; the PVDF solution is coated on the surface of the current collector next to the film area to form a thickness of 10μm, a continuous anti-collapsing coating with a width of 15μm;
(3)将涂覆号的膜片经干燥、辊压、模切、分条制备成负极极片。(3) The coated film is dried, rolled, die-cut, and slit to prepare a negative pole piece.
图1为本实施例提供的极片的俯视示意图如图1所示，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳。Fig. 1 is a schematic top view of the pole piece provided in this embodiment. As shown in Fig. 1, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the pole tab.
图2为本实施例提供的极片的侧视示意图，可以看出，集流体1的两面均涂布有电极膜层3和防塌边层2，且集流体1的每一面上防塌边层2与电极膜层3相接，图中的W代表了防塌边层的宽度(本实施例中，对于正极，W＝15mm；对于负极，W＝15μm)。Figure 2 is a schematic side view of the pole piece provided in this embodiment. It can be seen that both sides of the current collector 1 are coated with an electrode film layer 3 and an anti-collapsing layer 2, and each side of the current collector 1 is anti-collapsing The layer 2 is connected to the electrode film layer 3, and W in the figure represents the width of the anti-collapsing layer (in this embodiment, for the positive electrode, W=15mm; for the negative electrode, W=15μm).
图3为本实施例的极片在制备出极耳4之后的俯视示意图，极耳4由空箔区模切得到。FIG. 3 is a schematic top view of the pole piece of this embodiment after the tab 4 is prepared, and the tab 4 is die-cut from the empty foil area.
图1、图2和图3均适用于实施例1的正极和负极的结构。FIG. 1, FIG. 2 and FIG. 3 are all applicable to the structure of the positive electrode and the negative electrode of the first embodiment.
本实施例制备的正极极片由集流体1、电极膜层3和防塌边层2组成，所述防塌边层2和电极膜层3均位于集流体1上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边相接，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为15mm，厚度为30μm。防塌边层2无孔。防塌边层2主要由PVDF组成。正极集 流体1为铝箔，其厚度为12μm。The positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1, and on both sides of the current collector 1. Both have an anti-collapsing layer 2 and an electrode film layer 3. The electrode film layer 3 on the same surface of the current collector 1 and the anti-collapsing layer 2 have one side connected, and the current collector 1 is not covered by the electrode film layer 3 and the anti-collapsing layer The area covered by 2 is an empty foil area, which is used to prepare tabs 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapsing layer 2 is 15 mm and the thickness is 30 μm. The anti-collapsing side layer 2 has no holes. The anti-collapsing layer 2 is mainly composed of PVDF. The positive electrode current collector 1 is an aluminum foil with a thickness of 12 m.
本实施例制备的负极极片由集流体1、电极膜层3和防塌边层2组成，所述防塌边层2和电极膜层3均位于集流体1上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边相接，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为15mm，厚度为40μm。防塌边层2无孔。防塌边层2主要由PVDF组成。负极集流体1为铜箔，其厚度为6μm。The negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1, and both sides of the current collector 1. Both have an anti-collapsing layer 2 and an electrode film layer 3. The electrode film layer 3 on the same surface of the current collector 1 and the anti-collapsing layer 2 have one side connected, and the current collector 1 is not covered by the electrode film layer 3 and the anti-collapsing layer The area covered by 2 is an empty foil area, which is used to prepare tabs 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapsing layer 2 is 15 mm and the thickness is 40 μm. The anti-collapsing side layer 2 has no holes. The anti-collapsing layer 2 is mainly composed of PVDF. The negative electrode current collector 1 is a copper foil with a thickness of 6 μm.
本实施例还提供一种将上述极片制备成锂离子电池的方法，其具体方法为：This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
将根据前述工艺制备好的正极极片与负极极片通过模切工艺形成极耳后与隔离膜按照：负极-隔膜-正极-隔膜的方式通过卷绕卷成裸电芯；将完成卷绕的裸电芯热压后与顶盖外壳装配并焊接在一起完成电芯装配。最后，电芯经过注液、化成、排气、封口等工艺完成电芯制作，即得到锂离子电池。The positive pole piece and negative pole piece prepared according to the foregoing process are formed by die-cutting process to form the tabs and the separator in the manner of: negative electrode-separator-positive electrode-separator to be wound into a bare cell; the winding will be completed After hot pressing, the bare cell is assembled with the top cover shell and welded together to complete the cell assembly. Finally, the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
实施例2Example 2
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
负极：negative electrode:
(1)以石墨作为负极活性物质，以丁苯橡胶作为粘结剂，炭黑作为导电剂，羧甲基纤维素钠作为分散剂，以蒸馏水作为溶剂，将上述原料按照石墨：丁苯橡胶：炭黑：羧甲基纤维素钠＝96.5:1.5:1:1搅拌混合均匀，形成固含量为45％的负极浆料；(1) Use graphite as the negative electrode active material, use styrene-butadiene rubber as the binder, carbon black as the conductive agent, sodium carboxymethyl cellulose as the dispersant, and distilled water as the solvent. Carbon black: sodium carboxymethyl cellulose=96.5:1.5:1:1, stir and mix evenly to form a negative electrode slurry with a solid content of 45%;
(2)将PVDF、SP、Al2O3按照70:1:29的比例与NMP混合，制成固含量为20％的PVDF和Al2O3混合溶液；(2) Mix PVDF, SP, Al2O3 with NMP in a ratio of 70:1:29 to make a mixed solution of PVDF and Al2O3 with a solid content of 20%;
(3)将负极浆料涂布在负极集流体铜箔表面形成宽度为175mm，厚度为130μm的膜片，将PVDF和Al2O3混合溶液涂覆在集流体表面紧邻膜区的位置，形成厚度为10μm，宽度为15mm的防塌边涂层；(3) Coat the negative electrode slurry on the surface of the negative electrode current collector copper foil to form a diaphragm with a width of 175mm and a thickness of 130μm. Coat the PVDF and Al2O3 mixed solution on the surface of the collector next to the film area to form a thickness of 10μm , Anti-collapsing coating with a width of 15mm;
(4)将上述得到的负极膜片经干燥、辊压、模切、分条制备成负极极 片。(4) The negative electrode film obtained above is dried, rolled, die-cut, and slit to prepare a negative electrode sheet.
本实施例的负极极片结构参照实施例1的负极极片，本实施例制备的负极极片由集流体1、电极膜层3和防塌边层2组成，所述防塌边层2和电极膜层3均位于集流体1上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边相接，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为15mm，厚度为10μm。防塌边层2多孔结构。防塌边层2主要由PVDF和Al2O3组成。负极集流体1为铜箔，其厚度为6μm。The negative pole piece structure of this embodiment refers to the negative pole piece of Example 1. The negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The anti-collapsing layer 2 and The electrode film layer 3 is located on the current collector 1, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1. The electrode film layer 3 on the same side of the current collector 1 and the anti-collapsing layer 2 have one side opposite to each other. Then, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapse layer 2 is 15 mm and the thickness is 10 μm. The anti-collapse edge layer 2 has a porous structure. The anti-collapsing layer 2 is mainly composed of PVDF and Al2O3. The negative electrode current collector 1 is a copper foil with a thickness of 6 μm.
本实施例还提供一种将上述极片制备成锂离子电池的方法，其具体方法为：This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
(1)以三元材料作为正极活性材料，以炭黑作为导电剂，以聚偏氟乙烯作为粘结剂，以N-甲基吡咯烷酮(NMP)作为溶剂，再将上述材料按照正极材料：炭黑：聚偏氟乙烯＝97:1.5:1.5搅拌混合均匀形成固含量为70％的正极浆料；(1) Use ternary material as the positive electrode active material, carbon black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone (NMP) as the solvent, and then use the above materials as the positive electrode material: carbon Black: polyvinylidene fluoride=97:1.5:1.5, stir and mix uniformly to form a positive electrode slurry with a solid content of 70%;
(2)将正极浆料连续涂布在厚度为12μm的正极集流体铝箔两面，形成宽度为165mm，厚度为200μm的膜区；(2) Continuously coating the positive electrode slurry on both sides of the positive electrode current collector aluminum foil with a thickness of 12 μm to form a film area with a width of 165 mm and a thickness of 200 μm;
(3)将涂覆好的膜片经过烘干、辊压、模切、分条制备成正极极片；(3) The coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece;
(4)将根据前述工艺制备好的正极极片与负极极片通过模切工艺形成极耳后与隔离膜按照：负极-隔膜-正极-隔膜的方式通过卷绕卷成裸电芯；(4) The positive pole piece and the negative pole piece prepared according to the foregoing process are formed into tabs by die-cutting process and the separator is wound into a bare cell in the manner of negative electrode-diaphragm-positive electrode-diaphragm;
(5)将完成卷绕的裸电芯热压后与顶盖外壳装配并焊接在一起完成电芯装配。最后，电芯经过注液、化成、排气、封口等工艺完成电芯制作，即得到锂离子电池。(5) Hot-press the wound bare cell and assemble it with the top cover shell and weld it together to complete the cell assembly. Finally, the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
实施例3Example 3
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
负极：negative electrode:
(1)以石墨作为负极活性物质，以丁苯橡胶作为粘结剂，炭黑作为导电剂，羧甲基纤维素钠作为分散剂，以蒸馏水作为溶剂，将上述原料按照 石墨：丁苯橡胶：炭黑：羧甲基纤维素钠＝96.5:1.5:1:1搅拌混合均匀，形成固含量为45％的负极浆料；(1) Use graphite as the negative electrode active material, use styrene-butadiene rubber as the binder, carbon black as the conductive agent, sodium carboxymethyl cellulose as the dispersant, and distilled water as the solvent. Carbon black: sodium carboxymethyl cellulose=96.5:1.5:1:1, stir and mix evenly to form a negative electrode slurry with a solid content of 45%;
(2)将负极浆料涂布在厚度为6μm的负极集流体铜箔表面形成宽度为175mm，厚度为130μm的膜片，(2) Coating the negative electrode slurry on the surface of the negative electrode current collector copper foil with a thickness of 6μm to form a film with a width of 175mm and a thickness of 130μm,
(3)将PP熔融，并通过喷涂的方法，喷涂在负极膜区与空箔材取交界位置的空箔材侧，宽度为12mm，喷涂厚度为10μm；(3) Melt the PP and spray it on the side of the empty foil at the junction of the negative electrode film area and the empty foil, with a width of 12mm and a spraying thickness of 10μm;
(4)将负极浆料涂布在负极集流体铜箔的两面，经干燥、辊压、模切、分条制备成负极极片。(4) Coating the negative electrode slurry on both sides of the negative electrode current collector copper foil, drying, rolling, die cutting, and slitting to prepare a negative electrode sheet.
本实施例的负极极片结构参照实施例1的负极极片，本实施例制备的负极极片由集流体1、电极膜层3和防塌边层2组成，所述防塌边层2和电极膜层3均位于集流体1上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边相接，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为12mm，厚度为10μm。防塌边层2无孔。防塌边层2主要由PP组成。负极集流体1为铜箔，其厚度为4.5μm。The negative pole piece structure of this embodiment refers to the negative pole piece of Example 1. The negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The anti-collapsing layer 2 and The electrode film layer 3 is located on the current collector 1, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1. The electrode film layer 3 on the same side of the current collector 1 and the anti-collapsing layer 2 have one side opposite to each other. Then, the area on the current collector 1 that is not covered by the electrode film layer 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapsing layer 2 is 12 mm and the thickness is 10 μm. The anti-collapsing side layer 2 has no holes. The anti-collapsing layer 2 is mainly composed of PP. The negative electrode current collector 1 is a copper foil with a thickness of 4.5 μm.
本实施例还提供一种将上述极片制备成锂离子电池的方法，其具体方法为：This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
(1)以三元材料作为正极活性材料，以炭黑作为导电剂，以聚偏氟乙烯作为粘结剂，以N-甲基吡咯烷酮(NMP)作为溶剂，再将上述材料按照正极材料：炭黑：聚偏氟乙烯＝97:1.5:1.5搅拌混合均匀形成固含量为70％的正极浆料；(1) Use ternary material as the positive electrode active material, carbon black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone (NMP) as the solvent, and then use the above materials as the positive electrode material: carbon Black: polyvinylidene fluoride=97:1.5:1.5, stir and mix uniformly to form a positive electrode slurry with a solid content of 70%;
(2)将正极浆料连续涂布在厚度为12μm的正极集流体铝箔两面，形成宽度为165mm，厚度为200μm的膜区；(2) Continuously coating the positive electrode slurry on both sides of the positive electrode current collector aluminum foil with a thickness of 12 μm to form a film area with a width of 165 mm and a thickness of 200 μm;
(3)将涂覆好的膜片经过烘干、辊压、模切、分条制备成正极极片；(3) The coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece;
(4)将根据前述工艺制备好的正极极片与负极极片通过模切工艺形成极耳后与隔离膜按照：负极-隔膜-正极-隔膜的方式通过卷绕卷成裸电芯；(4) The positive pole piece and the negative pole piece prepared according to the foregoing process are formed into tabs by die-cutting process and the separator is wound into a bare cell in the manner of negative electrode-diaphragm-positive electrode-diaphragm;
(5)将完成卷绕的裸电芯热压后与顶盖外壳装配并焊接在一起完成电芯装配。最后，电芯经过注液、化成、排气、封口等工艺完成电芯制作， 即得到锂离子电池。(5) Hot-press the wound bare cell and assemble it with the top cover shell and weld it together to complete the cell assembly. Finally, the battery cell is manufactured through processes such as liquid injection, chemical conversion, exhaust, and sealing, etc., to obtain a lithium-ion battery.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
实施例4Example 4
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
正极：positive electrode:
(1)以三元材料作为正极活性材料，以炭黑作为导电剂，以聚偏氟乙烯作为粘结剂，以N-甲基吡咯烷酮(NMP)作为溶剂，再将上述材料按照正极材料：炭黑：聚偏氟乙烯＝96:2.5:1.5搅拌混合均匀形成固含量为70％的正极浆料；(1) Use ternary material as the positive electrode active material, carbon black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone (NMP) as the solvent, and then use the above materials as the positive electrode material: carbon Black: Polyvinylidene fluoride=96:2.5:1.5, stir and mix evenly to form a positive electrode slurry with a solid content of 70%;
(2)将PVDF、勃姆石颗粒(粒度为1-100μm)与NMP按照1:1:20的比例混合，制成PVDF和勃姆石混合溶液；(2) Mix PVDF, boehmite particles (with a particle size of 1-100μm) and NMP in a ratio of 1:1:20 to make a mixed solution of PVDF and boehmite;
(3)将正极浆料连续涂布在厚度为9μm的正极集流体表面，形成宽度为宽165mm，厚度为155μm的电极膜区；PVDF和勃姆石溶液涂覆在电极膜区紧邻空箔区的位置，形成厚度为100μm，宽度为10mm的防塌边涂层；(3) The positive electrode slurry is continuously coated on the surface of the positive electrode current collector with a thickness of 9μm to form an electrode membrane area with a width of 165mm and a thickness of 155μm; PVDF and boehmite solution are coated on the electrode membrane area next to the empty foil area Form the anti-collapsing coating with a thickness of 100μm and a width of 10mm;
(4)将涂覆好的膜片经过烘干、辊压、模切、分条制备成正极极片。(4) The coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
如图4所示，本实施例制备的正极极片由集流体1、电极膜层3和防塌边层2组成，所述电极膜层3均位于集流体1上，所述防塌边层2位于电极膜层3上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边对齐，集流体1上没有被电极膜层3覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为10mm，厚度为100μm。防塌边层有孔，且包括通孔和半通孔，孔形状主要为圆形和椭圆形。防塌边层2主要由PVDF和勃姆石颗粒组成。正极集流体1为铝箔，其厚度为10μm。As shown in FIG. 4, the positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The electrode film layers 3 are all located on the current collector 1, and the anti-collapsing layer 2 is located on the electrode film layer 3, and there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1. The area on 1 that is not covered by the electrode film layer 3 is an empty foil area, which is used to prepare the tab 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapse layer 2 is 10 mm and the thickness is 100 μm. The anti-collapsing layer has holes, including through holes and semi-through holes, and the hole shapes are mainly circular and elliptical. The anti-collapsing layer 2 is mainly composed of PVDF and boehmite particles. The positive electrode current collector 1 is an aluminum foil with a thickness of 10 μm.
本实施例还提供一种将上述极片制备成锂离子电池的方法，其具体方法为：This embodiment also provides a method for preparing the above-mentioned pole piece into a lithium ion battery, and the specific method is as follows:
(1)以石墨作为负极活性物质，以丁苯橡胶作为粘结剂，炭黑作为导电剂，羧甲基纤维素钠作为分散剂，以蒸馏水作为溶剂，将上述原料按照石墨：丁苯橡胶：炭黑：羧甲基纤维素钠＝96.5:1.5:1:1搅拌混合均匀，形 成固含量为45％的负极浆料；(1) Use graphite as the negative electrode active material, use styrene-butadiene rubber as the binder, carbon black as the conductive agent, sodium carboxymethyl cellulose as the dispersant, and distilled water as the solvent. Carbon black: sodium carboxymethyl cellulose=96.5:1.5:1:1, stir and mix evenly to form a negative electrode slurry with a solid content of 45%;
(2)将负极浆料涂布在厚度为6μm的负极集流体铜箔两面形成宽度为175mm，厚度为130μm的膜片，经干燥、辊压、模切、分条制备成负极极片。(2) Coating the negative electrode slurry on both sides of the negative electrode current collector copper foil with a thickness of 6 μm to form a film with a width of 175 mm and a thickness of 130 μm, which is dried, rolled, die-cut, and slit to prepare a negative electrode sheet.
(3)将根据前述工艺制备好的正极极片与负极极片通过模切工艺形成极耳后与隔离膜按照：负极-隔膜-正极-隔膜的方式通过卷绕卷成裸电芯；(3) The positive pole piece and the negative pole piece prepared according to the foregoing process are formed into tabs by die cutting process and the separator is wound into a bare cell in the manner of negative electrode-diaphragm-positive electrode-diaphragm;
(4)将完成卷绕的裸电芯热压后与顶盖外壳装配并焊接在一起完成电芯装配。最后，电芯经过注液、化成、排气、封口等工艺完成电芯制作，即得到锂离子电池。(4) Hot-press the wound bare cell and assemble it with the top cover shell and weld it together to complete the cell assembly. Finally, the battery cell is manufactured through processes such as liquid injection, formation, exhaust, and sealing, and the lithium-ion battery is obtained.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
实施例5Example 5
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
正极：positive electrode:
(1)以三元材料作为正极活性材料，以炭黑作为导电剂，以聚偏氟乙烯作为粘结剂，以N-甲基吡咯烷酮(NMP)作为溶剂，再将上述材料按照正极材料：炭黑：聚偏氟乙烯＝96:2.5:1.5搅拌混合均匀形成固含量为70％的正极浆料；(1) Use ternary material as the positive electrode active material, carbon black as the conductive agent, polyvinylidene fluoride as the binder, and N-methylpyrrolidone (NMP) as the solvent, and then use the above-mentioned materials as the positive electrode material: carbon Black: Polyvinylidene fluoride=96:2.5:1.5, stir and mix evenly to form a positive electrode slurry with a solid content of 70%;
(2)将PVDF、氮化硅颗粒(粒度为0.1-50μm)与NMP按照1:2:20的比例混合，制成PVDF和氮化硅混合溶液；(2) Mix PVDF, silicon nitride particles (with a particle size of 0.1-50μm) and NMP in a ratio of 1:2:20 to make a mixed solution of PVDF and silicon nitride;
(3)将正极浆料连续涂布在厚度为9μm的正极集流体的一面，形成宽度为宽165mm，厚度为155μm的膜区；PVDF和氮化硅溶液涂覆在空箔区紧邻膜区的位置，并且PVDF和氮化硅溶液的边缘延伸至膜区上，形成厚度为300μm，宽度为12mm的防塌边涂层；(3) Coat the positive electrode slurry continuously on one side of the positive electrode current collector with a thickness of 9μm to form a film area with a width of 165mm and a thickness of 155μm; PVDF and silicon nitride solution are coated on the empty foil area next to the film area Position, and the edge of PVDF and silicon nitride solution extends to the film area to form an anti-collapsing coating with a thickness of 300μm and a width of 12mm;
(4)将涂覆好的膜片经过烘干、辊压、模切、分条制备成正极极片。(4) The coated film is dried, rolled, die-cut, and slit to prepare a positive pole piece.
如图5所示，本实施例制备的正极极片由集流体1、电极膜层3和防塌边层2组成，所述电极膜层3均位于集流体1上，所述防塌边层2位于集流体1和电极膜层3上，且集流体1的仅由一面有防塌边层2和电极膜层3，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是连续的。防塌边层2的宽度W为12mm， 厚度为300μm。防塌边层有孔，且包括通孔和半通孔，孔形状主要为圆形、椭圆形和多边形。防塌边层2主要由PVDF和氮化硅颗粒组成。正极集流体1为铝箔，其厚度为10μm。As shown in FIG. 5, the positive pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The electrode film layers 3 are all located on the current collector 1, and the anti-collapsing layer 2 is located on the current collector 1 and the electrode film layer 3, and only one side of the current collector 1 has the anti-collapsing layer 2 and the electrode film layer 3, and the current collector 1 is not covered by the electrode film layer 3 and the electrode film layer 2 The area is an empty foil area, which is used to prepare tabs 4. The anti-collapse side layer 2 is continuous. The width W of the anti-collapsing layer 2 is 12 mm and the thickness is 300 μm. The anti-collapsing layer has holes, including through holes and semi-through holes, and the hole shapes are mainly circular, elliptical and polygonal. The anti-collapsing layer 2 is mainly composed of PVDF and silicon nitride particles. The positive electrode current collector 1 is an aluminum foil with a thickness of 10 μm.
按照实施例4的方法用本实施例制备的正极极片制备成锂离子电池。According to the method of Example 4, the positive pole piece prepared in this example was used to prepare a lithium ion battery.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
实施例6Example 6
本实施例按照如下方法制备极片：In this embodiment, the pole piece was prepared according to the following method:
负极：negative electrode:
参考实施例的负极制备方法，区别在于，步骤(2)中防塌边涂层不是连续的，而是有两个间断位置，由三部分防塌边层组成，相邻两部分防塌边层之间的间距为1mm。The negative electrode preparation method of the reference embodiment, the difference is that the anti-collapsing coating in step (2) is not continuous, but has two discontinuous positions, consisting of three parts of the anti-collapsing layer, and two adjacent parts of the anti-collapsing layer The distance between them is 1mm.
如图6所示，本实施例制备的负极极片由集流体1、电极膜层3和防塌边层2组成，所述防塌边层2和电极膜层3均位于集流体1上，且集流体1的两面均有防塌边层2和电极膜层3，集流体1同一面上的电极膜层3与防塌边层2有一边相接，集流体1上没有被电极膜层3和防塌边层2覆盖的区域为空箔区，用于制备极耳4。防塌边层2是间断的，由三部分组成，相邻两部分之间的间距为1mm。防塌边层2的宽度W为15μm，厚度为10μm。防塌边层2无孔。防塌边层2主要由PVDF组成。负极集流体1为铜箔，其厚度为12μm。As shown in Fig. 6, the negative pole piece prepared in this embodiment is composed of a current collector 1, an electrode film layer 3, and an anti-collapsing layer 2. The anti-collapsing layer 2 and the electrode film layer 3 are both located on the current collector 1. And there are anti-collapsing layer 2 and electrode film layer 3 on both sides of the current collector 1. The electrode film layer 3 on the same side of the collector 1 and the anti-collapsing layer 2 have one side connected, and there is no electrode film layer on the current collector 1. The area covered by 3 and the anti-collapsing layer 2 is an empty foil area, which is used to prepare the tab 4. The anti-collapsing layer 2 is discontinuous and consists of three parts, and the distance between two adjacent parts is 1 mm. The width W of the anti-collapsing layer 2 is 15 μm and the thickness is 10 μm. The anti-collapsing side layer 2 has no holes. The anti-collapsing layer 2 is mainly composed of PVDF. The negative electrode current collector 1 is a copper foil with a thickness of 12 μm.
按照实施例2的方法用本实施例制备的负极极片制备成锂离子电池。According to the method of Example 2, the negative pole piece prepared in this example was used to prepare a lithium ion battery.
本实施例提供的极片的测试结果见表1。The test results of the pole pieces provided in this embodiment are shown in Table 1.
对比例1Comparative example 1
本对比例提供的正极和负极除了均没有使用防塌边层之外，其他材料和结构分别与实施例1的正极和负极相同。The positive electrode and the negative electrode provided in this comparative example are the same as the positive electrode and the negative electrode of Example 1, except that neither of them use the anti-collapsing layer.
本对比例提供的极片的测试结果见表1。The test results of the pole piece provided by this comparative example are shown in Table 1.
对比例2Comparative example 2
本对比例提供的负极除了均没有使用防塌边层之外，其他材料和结构分别与实施例2的负极相同。The negative electrode provided in this comparative example does not use the anti-collapsing layer, and other materials and structures are the same as those of the negative electrode of Example 2.
本对比例提供的极片的测试结果见表1。The test results of the pole piece provided by this comparative example are shown in Table 1.
对比例3Comparative example 3
本对比例提供的负极除了均没有使用防塌边层之外，其他材料和结构分别与实施例3的负极相同。The negative electrode provided in this comparative example does not use the anti-collapsing layer, and other materials and structures are the same as those of the negative electrode of Example 3.
本对比例提供的极片的测试结果见表1。The test results of the pole piece provided by this comparative example are shown in Table 1.
测试方法：Test Methods:
在电芯中试线上进行各实施例和对比例的电芯生产，统计模切异常以及极耳翻折率，对每一种极片统计10000个样品。其中，极耳模切异常是指模切时初选切不断或者极耳模切过程中受损的情况。卷绕机而翻折率是指卷绕过程中极耳翻折并且卷入裸电芯内的概率。The cell production of each embodiment and comparative example was carried out on the cell pilot test line, and the die-cutting abnormality and the tab turning rate were counted, and 10,000 samples were counted for each type of pole piece. Among them, the abnormality of the die-cutting of the tab refers to the condition that the primary selection is continuous during die-cutting or the tab is damaged during the die-cutting process. The turn-over rate of the winding machine refers to the probability of the tabs turning over and being rolled into the bare cell during the winding process.
测试结果如下表所示：The test results are shown in the following table:
表1Table 1
Figure PCTCN2021093748-appb-000001
Figure PCTCN2021093748-appb-000001
综合上述实施例和对比例可知，实施例采用防塌边层，可以有效对集流体边缘起到支撑作用，减少由于极片边缘塌边造成的极耳模切异常以及卷绕过程中极耳翻折问题。Based on the foregoing embodiments and comparative examples, it can be seen that the embodiment adopts the anti-collapsing layer, which can effectively support the edge of the current collector, and reduce the abnormal die-cutting of the tab due to the collapse of the pole piece edge and the tab turning during the winding process. Fold problem.
对比例1、2和3均没有使用防塌边层，使得其极耳模切异常率和卷绕极耳翻折率明显高于实施例的结果。In Comparative Examples 1, 2 and 3, none of the anti-collapsing layer was used, so that the abnormal rate of die-cutting of the tabs and the folding rate of the winding tabs were significantly higher than the results of the examples.
申请人声明，本发明通过上述实施例来说明本发明的详细工艺设备和工艺流程，但本发明并不局限于上述详细工艺设备和工艺流程，即不意味着本发明必须依赖上述详细工艺设备和工艺流程才能实施。所属技术领域的技术人员应该明了，对本发明的任何改进，对本发明产品各原料的等效替换及辅助成分的添加、具体方式的选择等，均落在本发明的保护范围和公开范围之内。The applicant declares that the present invention uses the above embodiments to illustrate the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, which does not mean that the present invention must rely on the above detailed process equipment and process flow. The process can be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims (10)

  1. 一种极片，其特征在于，所述极片包括集流体、电极膜层和防塌边层，所述电极膜层位于集流体上，所述防塌边层位于集流体上和/或电极膜层上。A pole piece, characterized in that the pole piece comprises a current collector, an electrode film layer and an anti-collapse layer, the electrode film layer is located on the current collector, the anti-collapse layer is located on the current collector and/or the electrode膜层上。 The film layer.
  2. 根据权利要求1所述的极片，其特征在于，所述电极膜层和防塌边层均位于集流体上，所述电极膜层的一边与防塌边层的一边相接；The pole piece according to claim 1, wherein the electrode film layer and the anti-collapsing layer are both located on the current collector, and one side of the electrode film layer is in contact with one side of the anti-collapsing layer;
    所述防塌边层位于电极膜层上，所述防塌边层的一边与电极膜层的一边对齐；The anti-collapsing layer is located on the electrode film layer, and one side of the anti-collapsing layer is aligned with one side of the electrode film layer;
    所述防塌边层一部分位于集流体上，其余部分位于电极膜层上；A part of the anti-collapse edge layer is located on the current collector, and the rest is located on the electrode film layer;
    所述集流体的至少一边为空箔区，所述空箔区上不设有防塌边层和电极膜层；At least one side of the current collector is an empty foil area, and the empty foil area is not provided with an anti-collapsing layer and an electrode film layer;
    所述电极膜层和防塌边层均位于集流体的一面或所述电极膜层和防塌边层均位于集流体的两面；The electrode film layer and the anti-collapsing layer are both located on one side of the current collector or the electrode film layer and the anti-collapsing layer are both located on both sides of the current collector;
    所述防塌边层为连续的或间断的。The anti-collapse edge layer is continuous or discontinuous.
  3. 根据权利要求1或2所述的极片，其特征在于，所述集流体包括铜箔和/或铝箔；The pole piece according to claim 1 or 2, wherein the current collector comprises copper foil and/or aluminum foil;
    所述集流体的厚度为2μm-20μm；The thickness of the current collector is 2 μm-20 μm;
    所述电极膜层包括电极活性物质；The electrode film layer includes an electrode active material;
    所述极片为正极片或负极片。The pole piece is a positive electrode piece or a negative electrode piece.
  4. 根据权利要求1-3任一项所述的极片，其特征在于，所述防塌边层的厚度为1-300μm，优选为10-100μm；The pole piece according to any one of claims 1 to 3, wherein the thickness of the anti-collapsing layer is 1-300 μm, preferably 10-100 μm;
    所述防塌边层的宽度为1mm-20mm，优选为3mm-12mm；The width of the anti-collapsing layer is 1mm-20mm, preferably 3mm-12mm;
    所述防塌边层为无孔层或多孔层；The anti-collapsing layer is a non-porous layer or a porous layer;
    所述防塌边层为多孔层，所述孔为圆形、椭圆、方形、三角形、多边形或不规则形状中的任意一种或至少两种的组合；The anti-collapsing layer is a porous layer, and the holes are any one or a combination of at least two of a circle, an ellipse, a square, a triangle, a polygon, or an irregular shape;
    所述防塌边层为多孔层，所述孔为通孔和/或半通孔。The anti-collapsing layer is a porous layer, and the holes are through holes and/or semi-through holes.
  5. 根据权利要求1-4任一项所述的极片，其特征在于，所述防塌边层中包括导体、半导体、绝缘体或正温度系数材料中任意一种或至少两种的组合；The pole piece according to any one of claims 1 to 4, wherein the anti-collapsing layer includes any one or a combination of at least two of a conductor, a semiconductor, an insulator, or a positive temperature coefficient material;
    所述防塌边层中包括聚偏氟乙烯、聚氨酯、聚丙烯酸钠、丁苯橡胶、聚醚酰亚胺、羧甲基纤维素、丙烯酸酯、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二酯、聚丙烯、聚乙烯、二氧化硅、碳化硅、钛酸钡、氧化钛或氧化钒中的任意一种或至少两种的组合；The anti-collapsing layer includes polyvinylidene fluoride, polyurethane, sodium polyacrylate, styrene-butadiene rubber, polyetherimide, carboxymethyl cellulose, acrylate, polyethylene terephthalate, and polyethylene terephthalate. Any one or a combination of at least two of butylene phthalate, polypropylene, polyethylene, silicon dioxide, silicon carbide, barium titanate, titanium oxide or vanadium oxide;
    所述防塌边层中还包括颗粒；The anti-collapsing edge layer also includes particles;
    所述颗粒包括聚偏氟乙烯颗粒、氧化铝颗粒、勃姆石颗粒、氧化硅颗粒、氧化钒颗粒、氮化硅颗粒或碳化硅颗粒中的任意一种或至少两种的组合；The particles include any one or a combination of at least two of polyvinylidene fluoride particles, alumina particles, boehmite particles, silicon oxide particles, vanadium oxide particles, silicon nitride particles, or silicon carbide particles;
    所述颗粒的粒径为0.1μm-100μm。The particle size of the particles is 0.1 μm-100 μm.
  6. 如权利要求1-5任一项所述极片的制备方法，其特征在于，所述方法包括以下步骤：The method for preparing the pole piece according to any one of claims 1 to 5, wherein the method comprises the following steps:
    在集流体上涂覆电极膜层，进行防塌边层制备，得到所述极片。The electrode film layer is coated on the current collector, and the anti-collapsing layer is prepared to obtain the pole piece.
  7. 根据权利要求6所述的制备方法，其特征在于，所述进行防塌边层制备的方法包括涂覆、喷涂、溅射、镀膜或沉积中的任意一种或至少两种的组合；The preparation method according to claim 6, wherein the method for preparing the anti-collapsing layer comprises any one or a combination of at least two of coating, spraying, sputtering, plating or deposition;
    所述进行防塌边层制备的方法包括将防塌边层的原料制备成浆料后进行涂覆。The method for preparing the anti-collapsing layer includes preparing the raw material of the anti-collapsing layer into a slurry and then coating.
  8. 根据权利要求6或7所述的制备方法，其特征在于，所述进行防塌边层制备的方法还包括阳极氧化、喷砂、等离子处理、加热辊处理或激光处理中的任意一种或至少两种的组合。The preparation method according to claim 6 or 7, characterized in that, the method for preparing the anti-collapsing layer further comprises any one or at least one of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment A combination of the two.
  9. 根据权利要求6-8任一项所述的制备方法，其特征在于，所述方法包括以下步骤：The preparation method according to any one of claims 6-8, wherein the method comprises the following steps:
    在集流体上涂覆电极膜层，进行防塌边层制备，得到所述极片；其中，所述防塌边层制备的方法包括涂覆、喷涂、溅射、镀膜或沉积中的任意一种或至少两种的组合；所述防塌边层中包括氧化物时，所述防塌边层制备的方法还包括阳极氧化、喷砂、等离子处理、加热辊处理或激光处理中的任意一种或至少两种的组合以进行氧化。The electrode film layer is coated on the current collector to prepare the anti-collapsing layer to obtain the pole piece; wherein, the method for preparing the anti-collapsing layer includes any one of coating, spraying, sputtering, coating or deposition One or a combination of at least two; when the anti-collapsing layer includes oxide, the method for preparing the anti-collapsing layer further includes any one of anodizing, sandblasting, plasma treatment, heating roller treatment or laser treatment Or a combination of at least two to perform oxidation.
  10. 一种锂离子电池，其特征在于，所述锂离子电池包含如权利要求1-5任一项所述的极片。A lithium ion battery, characterized in that the lithium ion battery comprises the pole piece according to any one of claims 1-5.
PCT/CN2021/093748 2020-05-19 2021-05-14 Pole piece and preparation method therefor and lithium ion battery WO2021233214A1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114184513A (en) * 2021-12-02 2022-03-15 华鼎国联四川动力电池有限公司 Method for detecting distribution of adhesive in lithium ion battery negative pole piece
CN114975885A (en) * 2022-06-13 2022-08-30 惠州锂威新能源科技有限公司 Preparation method of tab pole piece, battery cell and lithium ion battery
CN115000351A (en) * 2022-05-31 2022-09-02 上海兰钧新能源科技有限公司 Method for solving problem of pole piece strip breakage in rolling process
CN115050926A (en) * 2022-06-22 2022-09-13 多氟多新能源科技有限公司 Preparation method of protective coating for positive and negative pole pieces of lithium ion battery water system
WO2023216772A1 (en) * 2022-05-07 2023-11-16 宁德时代新能源科技股份有限公司 Electrode sheet and manufacturing method, electrode assembly and manufacturing method, battery cell, and battery

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111564637A (en) * 2020-05-19 2020-08-21 江苏塔菲尔新能源科技股份有限公司 Pole piece, preparation method thereof and lithium ion battery
CN111640948A (en) * 2020-05-26 2020-09-08 江苏塔菲尔新能源科技股份有限公司 Anode pole piece, preparation method thereof and lithium ion battery
CN114122408B (en) * 2021-11-15 2023-07-07 芜湖天弋能源科技有限公司 Device and method for improving turnover of lug of interlayer current collector
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WO2024060680A1 (en) * 2022-09-19 2024-03-28 珠海冠宇电池股份有限公司 Battery electrode sheet, battery cell and battery

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016186945A (en) * 2016-06-29 2016-10-27 オートモーティブエナジーサプライ株式会社 Lithium ion secondary battery
CN107681117A (en) * 2017-09-19 2018-02-09 合肥国轩高科动力能源有限公司 A kind of electrodes of lithium-ion batteries and its preparation technology for scribbling ceramic slurry
CN110518249A (en) * 2019-09-09 2019-11-29 江苏塔菲尔新能源科技股份有限公司 A kind of battery core pole piece and obtained battery core is assembled by it
CN111564637A (en) * 2020-05-19 2020-08-21 江苏塔菲尔新能源科技股份有限公司 Pole piece, preparation method thereof and lithium ion battery

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104904053B (en) * 2013-11-27 2017-10-24 株式会社Lg化学 Electrode assemblie and the electrochemical appliance comprising it
CN106129327A (en) * 2016-08-10 2016-11-16 欣旺达电子股份有限公司 Anode slice of lithium ion battery and lithium ion battery
CN106784848B (en) * 2017-01-18 2019-10-22 江苏海四达电源股份有限公司 Insulating coating composition, the preparation method of insulating coating, positive plate and lithium ion battery
CN209487601U (en) * 2019-03-26 2019-10-11 天津市捷威动力工业有限公司 A kind of lithium ion battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016186945A (en) * 2016-06-29 2016-10-27 オートモーティブエナジーサプライ株式会社 Lithium ion secondary battery
CN107681117A (en) * 2017-09-19 2018-02-09 合肥国轩高科动力能源有限公司 A kind of electrodes of lithium-ion batteries and its preparation technology for scribbling ceramic slurry
CN110518249A (en) * 2019-09-09 2019-11-29 江苏塔菲尔新能源科技股份有限公司 A kind of battery core pole piece and obtained battery core is assembled by it
CN111564637A (en) * 2020-05-19 2020-08-21 江苏塔菲尔新能源科技股份有限公司 Pole piece, preparation method thereof and lithium ion battery

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114184513A (en) * 2021-12-02 2022-03-15 华鼎国联四川动力电池有限公司 Method for detecting distribution of adhesive in lithium ion battery negative pole piece
CN114184513B (en) * 2021-12-02 2024-02-27 华鼎国联四川动力电池有限公司 Method for detecting distribution of adhesive in lithium ion battery negative electrode plate
WO2023216772A1 (en) * 2022-05-07 2023-11-16 宁德时代新能源科技股份有限公司 Electrode sheet and manufacturing method, electrode assembly and manufacturing method, battery cell, and battery
CN115000351A (en) * 2022-05-31 2022-09-02 上海兰钧新能源科技有限公司 Method for solving problem of pole piece strip breakage in rolling process
CN114975885A (en) * 2022-06-13 2022-08-30 惠州锂威新能源科技有限公司 Preparation method of tab pole piece, battery cell and lithium ion battery
CN114975885B (en) * 2022-06-13 2023-06-27 惠州锂威新能源科技有限公司 Preparation method of tab pole piece, battery cell and lithium ion battery
CN115050926A (en) * 2022-06-22 2022-09-13 多氟多新能源科技有限公司 Preparation method of protective coating for positive and negative pole pieces of lithium ion battery water system
CN115050926B (en) * 2022-06-22 2023-07-14 多氟多新能源科技有限公司 Preparation method of lithium ion battery water system positive and negative plate protective coating

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