CN111063860A - Electrode plate, preparation method thereof and battery - Google Patents

Electrode plate, preparation method thereof and battery Download PDF

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Publication number
CN111063860A
CN111063860A CN201911316922.2A CN201911316922A CN111063860A CN 111063860 A CN111063860 A CN 111063860A CN 201911316922 A CN201911316922 A CN 201911316922A CN 111063860 A CN111063860 A CN 111063860A
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China
Prior art keywords
binder
current collector
film
protective film
electrode
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Chinese (zh)
Inventor
叶凯
张国民
龙翔
宾建军
赵顺昌
张菊花
王军
熊建云
赵小军
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Jiangxi Beiteli New Energy Co ltd
Shenzhen Betterpower Battery Co ltd
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Jiangxi Beiteli New Energy Co ltd
Shenzhen Betterpower Battery Co ltd
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Priority to CN201911316922.2A priority Critical patent/CN111063860A/en
Publication of CN111063860A publication Critical patent/CN111063860A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139Processes of manufacture
    • H01M4/1391Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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

Abstract

The invention relates to an electrode plate, a preparation method thereof and a battery. The electrode plate comprises a current collector with a seepage hole, an electrode material filled in the seepage hole and a protective film, wherein the protective film comprises at least one of a top film and an intermediate film, the intermediate film is arranged on the hole wall of the seepage hole and is bonded with the electrode material and the hole wall, and the top film is bonded with the surface of the current collector. The protective film containing the adhesive is arranged on the electrode plate, so that burrs and powder falling caused by bending of the electrode plate during winding are reduced, and the electrode plate is higher in charge retention rate and better in safety when applied to a battery.

Description

Electrode plate, preparation method thereof and battery
Technical Field
The invention relates to the technical field of batteries, in particular to an electrode plate, a preparation method thereof and a battery.
Background
Electrode sheets of rechargeable secondary chemical batteries (e.g., lithium batteries) that can be recycled mainly include current collectors that are electrically conductive as the battery and electrode materials that are disposed on the current collectors in a filled or attached form.
The preparation of the electrode slice is mainly divided into a dry method and a wet method. When the electrode plate is prepared by a wet method, an electrode material, a conductive agent, an adhesive, a solvent and the like are generally uniformly mixed to obtain electrode slurry, and then coating and drying are carried out to obtain the electrode plate. The dry process for preparing electrode plate generally comprises mixing conductive agent, binder and electrode material to prepare a membrane, and then compounding the membrane with a current collector to form the electrode plate. However, the charge retention rate of the battery using the electrode plate prepared by the dry method as the electrode plate or the battery using the electrode plate prepared by the wet method as the electrode plate is low at present.
Disclosure of Invention
In view of this, it is necessary to provide an electrode sheet capable of improving the charge retention rate of a battery.
In addition, the preparation method of the electrode plate capable of improving the charge retention rate of the battery and the battery with high charge retention rate are also provided.
An electrode plate comprises a current collector with a seepage hole, an electrode material filled in the seepage hole and a protective film, wherein the protective film comprises at least one of a top film and an intermediate film, the intermediate film is arranged on the surface of the seepage hole and is in contact with the electrode material, the top film is coated on the surface of the current collector, and the top film and the intermediate film both contain a binder.
The protective film containing the adhesive is arranged on the electrode plate, so that burrs and powder falling caused by bending of the electrode plate during winding are reduced, and the electrode plate is higher in charge retention rate and better in safety when applied to a battery.
In one embodiment, the current collector is a mesh structure with a porous hole, the protective film comprises the top film and the intermediate film, one side of the intermediate film is adhered to the hole wall of the porous hole, the other side of the intermediate film is adhered to the electrode material, and the top film is coated on the current collector and is adhered to the current collector.
In one embodiment, the thickness of the intermediate film is 0.015 mm-0.025 mm; and/or
The thickness of the top film is 0.015-0.025 mm.
The utility model provides an electrode slice, includes the mass flow body, by diaphragm and the protection film that electrode material made, the diaphragm is located on the mass flow body, the protection film includes at least one of top film and intermediate film, the intermediate film is located the mass flow body with between the diaphragm, and with the mass flow body with the diaphragm bonds, the top film glue cover in the diaphragm is kept away from one side of the mass flow body.
A preparation method of an electrode slice comprises the following steps:
and preparing a protective film on the current collector and/or the electrode material by using a solution containing the binder or an emulsion containing the binder to obtain the electrode slice.
In one embodiment, the step of preparing a protective film on a current collector by using a solution containing a binder or an emulsion containing a binder to obtain the electrode sheet comprises:
preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing the binder to obtain the current collector with the protective film; and
and coating, filling or rolling an electrode material on the current collector with the protective film to obtain the electrode plate.
In one embodiment, the step of preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing a binder to obtain the current collector with the protective film comprises:
passing the current collector through an atomization area formed by atomizing a solution containing a binder to obtain the current collector with a protective film; or soaking the current collector in an emulsion containing a binder and then drying to obtain the current collector with the protective film.
In one embodiment, the step of preparing a protective film on the electrode material by using a solution containing a binder or an emulsion containing a binder to obtain the electrode sheet comprises:
coating, filling or rolling the electrode material on a current collector to obtain a primary electrode slice; and
and preparing a protective film on the primary electrode sheet by using a solution containing a binder or an emulsion containing the binder to obtain the electrode sheet.
In one embodiment, the step of preparing the protective film on the primary electrode sheet using a solution containing a binder or an emulsion containing a binder includes:
passing the primary electrode sheet through an atomization area formed by atomizing a solution containing a binder to obtain a protective film; or soaking the primary electrode slice in a solution containing a binder and then drying to obtain the protective film.
In one embodiment, the protective film comprises an intermediate film and a top film, the intermediate film is a film layer prepared on a current collector by using the solution or emulsion containing the binder, and the top film is a film layer prepared on an electrode material by using the solution or emulsion containing the binder.
In one embodiment, the step of preparing the protective film on the current collector and the electrode material by using the solution containing the binder or the emulsion containing the binder comprises the following steps:
enabling the current collector to pass through an atomization area formed by atomizing a solution containing a binder or drying the current collector after soaking the current collector in an emulsion containing the binder to obtain an intermediate membrane;
coating, filling or rolling an electrode material on the interlayer film to obtain a composite body; and
and (3) passing the composite through an atomization area formed by atomizing a solution containing the binder or drying the composite after soaking the composite in an emulsion containing the binder to obtain the top film.
In one embodiment, the binder comprises at least one of polytetrafluoroethylene, hydroxypropyl methylcellulose, and carboxymethyl cellulose.
A battery comprises the electrode plate or the electrode plate prepared by the preparation method of the electrode plate.
Drawings
FIG. 1 is a schematic partial cross-sectional view of an electrode sheet according to one embodiment;
fig. 2 is a partial cross-sectional view schematically illustrating an electrode sheet according to another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Some embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, the electrode sheet 10 according to an embodiment includes a current collector 110 having a penetration hole 111, an electrode material 120 filled in the penetration hole 111, and a protective film 130, and the protective film 130 includes at least one of an intermediate film 131, a top film 133, and a base film. The material of the protective film 130 is at least one of polytetrafluoroethylene, hydroxypropyl methylcellulose and carboxymethyl cellulose. The intermediate film 131 can reduce the falling off of the electrode material 120 in the penetration hole 111 in the current collector 110, and is beneficial to improving the charge retention rate of the battery. The top film 133 covers the outer surface of the current collector 110, so that the electrode material 120 near the outer surface of the current collector 110 is not easily peeled off.
In one embodiment, the protective film 130 includes an intermediate film 131, and the intermediate film 131 is disposed on the surface of the penetration hole 111 and is adhered to the electrode material 120. The interlayer 131 contains a binder. Further, the thickness of the interlayer film 131 is 0.015mm to 0.025mm
In another embodiment, the protective film 130 includes a top film 133, and the top film 133 covers the surface of the current collector 110. The top film 133 contains a binder. Further, the top film 133 covers the outer surface of the current collector 110 and seals the opening 112 of the penetration hole 111 on the outer surface of the current collector 110. The openings 112 of the penetration holes 111 are sealed, so that the electrode material 120 is completely wrapped in the current collector 110 by the top film 133, and the generation of powder falling and burrs can be further reduced. The thickness of the top film 133 is 0.015mm to 0.025 mm.
In one embodiment, the protection film 130 includes an intermediate film 131 and a top film 133, one side of the intermediate film 131 is adhered to the hole wall of the penetration hole 111, and the other side is adhered to the electrode material 120. The top film 133 covers the current collector 110 and is bonded to the current collector 110.
In one embodiment, the current collector 110 has a network structure of pores 111.
The research shows that the traditional electrode plate 10 is easy to generate burrs and powder falling due to bending when being wound to prepare the battery, and the burrs and powder falling are easy to cause micro short circuit of the battery in the recycling process of the battery. Generally, the proportion of micro short-circuiting due to burrs and dusting is about 0.1%. The self-discharge of the battery is fast after the battery is subjected to micro short circuit, so that the battery can be discharged without electricity after being fully charged and placed for a period of time, namely the charge retention rate of the battery is poor. And burrs and powder falling easily cause short circuit in the battery to cause heat generation in the battery, and the safety is low. The protective film 130 containing the binder is arranged on the electrode sheet 10, so that burrs and powder falling caused by bending of the electrode sheet 10 during winding are reduced, and the prepared electrode sheet 10 has higher charge retention rate and higher safety when applied to a battery.
As shown in fig. 2. The electrode sheet 20 according to another embodiment has a structure substantially the same as that of the electrode sheet 10, and is different from the electrode sheet 20 in that the current collector 210 of the electrode sheet 20 has a three-dimensional structure without a pore.
Specifically, the electrode sheet 20 includes a current collector 210, a membrane 220 made of an electrode material, and a protective film 130, where the membrane 220 is disposed on the current collector 210, the protective film 230 includes at least one of a top film 233 and an intermediate film 231, the intermediate film 231 is disposed between the current collector 210 and the membrane 220 and is bonded to the current collector 210 and the membrane 220, and the top film 233 is adhered to one side of the membrane 220 away from the current collector 210. Both the top film 233 and the interlayer 231 contain an adhesive. Further, the current collector 210 has a sheet structure without a porous structure. Such as aluminum foil, copper foil, etc.
The preparation method of the electrode slice comprises the following steps:
and preparing a protective film on the current collector and/or the electrode material by using a solution containing the binder or an emulsion containing the binder to obtain the electrode slice.
In one embodiment, the method for preparing the electrode sheet comprises the following steps: preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing the binder to obtain the current collector with the protective film; and then coating, filling or rolling the electrode material on the current collector with the protective film to obtain the electrode plate. Namely, the steps of the preparation method of the electrode sheet include steps S110 to S120.
And S110, preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing the binder to obtain the current collector with the protective film.
Specifically, passing a current collector through an atomization zone formed by atomizing a solution containing a binder to obtain a current collector with a protective film; or soaking the current collector in an emulsion containing a binder and then drying to obtain the current collector with the protective film. The solution containing the binder is atomized to form a protective film on the current collector, so that the protective film with uniform thickness can be formed conveniently, and the content of the binder in the protective film can be controlled conveniently.
Further, the solution containing the binder is atomized by passing the solution through dry air of 35MPa to 45 MPa. The mass percentage of the binder in the solution containing the binder is 3-5%. Preferably, the mass percentage of the binder in the binder-containing solution is 3% to 4%. Of course, the solvent for preparing the solution containing the binder is a solvent commonly used in the art. Such as water, alcohol, organic solvents, and the like.
Furthermore, the content of the binder in the emulsion containing the binder is 55-70%. Preferably, the content of the binder in the binder-containing emulsion is 60% to 65%.
Further, the current collector is of a three-dimensional structure without pores. At this time, the current collector with the protective film comprises a current collector and the protective film adhered to the surface of the current collector.
Further, the current collector is of a three-dimensional structure with pores. At this moment, the current collector with the protective film comprises a current collector and the protective film which is adhered to the pore wall of the seepage hole of the current collector.
Further, the thickness of the protective film is 0.015-0.025 mm. Of course, the thickness of the protective film can be adjusted and designed according to the electrode material, the material and the shape of the current collector.
And step S120, coating, filling or rolling the electrode material on the current collector with the protective film to obtain the electrode plate.
Specifically, the current collector has a three-dimensional structure without pores. In this case, the current collector having the protective film includes a current collector and a protective film in contact with the surface of the current collector. The step of coating, filling or rolling the electrode material onto a current collector with a protective film to obtain the electrode sheet comprises the following steps: firstly, mixing an electrode material and a solvent to prepare slurry, then coating the slurry on a protective film on a current collector, and then drying to obtain the electrode plate. Or firstly making the electrode material into a membrane, and then rolling and compounding the membrane and the current collector with the protective film to obtain the electrode plate.
Specifically, the current collector has a three-dimensional structure with pores. At this time, the current collector with the protective film comprises a current collector and the protective film which is in contact with the pore wall of the seepage hole of the current collector. The step of coating, filling or rolling the electrode material onto a current collector with a protective film to obtain the electrode sheet comprises the following steps: and filling the electrode material on the current collector with the protective film to obtain the electrode plate.
In one embodiment, the method for preparing the electrode sheet comprises the following steps: coating, filling or rolling the electrode material on a current collector to obtain a primary electrode slice; and then preparing a protective film on the electrode material of the primary electrode slice to obtain the electrode slice.
Specifically, the step of preparing the protective film on the electrode material of the primary electrode sheet includes: passing the primary electrode sheet through an atomization zone formed by atomizing a solution containing a binder so that a protective film is formed on the surface of the primary electrode sheet; or soaking the primary electrode plate in an emulsion containing the binder and then drying to form a protective film on the surface of the electrode plate. Further, the thickness of the protective film is 0.015-0.025 mm. Of course, the thickness of the protective film can be adjusted and designed according to the electrode material, the material and the shape of the current collector.
In one embodiment, the protective film comprises an intermediate film and a top film, wherein the intermediate film is a film layer prepared on the current collector by using a solution containing a binder, and the top film is a film layer prepared on the electrode material by using a solution containing a binder or an emulsion containing a binder. At this time, the step of preparing the protective film on the current collector and the electrode material using the binder-containing solution or the binder-containing emulsion includes: enabling the current collector to pass through an atomization area formed by atomizing a solution containing a binder or drying the current collector after soaking the current collector in an emulsion containing the binder to obtain an intermediate membrane; then coating, filling or rolling the electrode material on the interlayer film to obtain a complex; the composite is then passed through an atomization zone formed by atomizing a solution containing the binder or the composite is immersed in an emulsion containing the binder and dried to obtain the top film.
In the present embodiment, the thickness of the intermediate film and the top film is 0.015mm to 0.025 mm. Of course, the thicknesses of the intermediate film and the top film can be adjusted and designed according to the electrode material and the material and shape of the current collector.
Specifically, the binder is at least one selected from polytetrafluoroethylene, hydroxypropylmethylcellulose, and carboxymethylcellulose. When the binder is at least one of polytetrafluoroethylene, hydroxypropyl methylcellulose and carboxymethyl cellulose, the protective film can not influence the transmission of electrons between the current collector and the electrode material, and the falling of the electrode material is reduced. Further, the binder is selected from one of polytetrafluoroethylene, hydroxypropyl methylcellulose and carboxymethyl cellulose.
Specifically, the electrode material includes an active material. Further, the active material is selected from one of nickel hydroxide, lithium cobaltate, hydrogen storage alloy, cadmium hydroxide, graphite, zinc and zinc oxide, ternary composite material and lithium iron material. Of course, the active material of the electrode material is not limited to the above materials, and may be selected according to the specific requirements of the prepared electrode sheet.
Further, the electrode material also includes a conductive agent and a binder. The conductive agent is selected from at least one of conductive carbon black, graphite, carbon nanotubes, carbon fibers, acetylene black and ketjen black. The adhesive is selected from one of polytetrafluoroethylene, polypropylene and polyethylene. Preferably, the mass portion of the active material is 1 to 3, the mass portion of the conductive agent is 2 to 6, and the mass portion of the adhesive is 1 to 2.
According to the preparation method of the electrode plate, the protective film is formed on the current collector and/or the electrode material, so that burrs and powder falling caused by bending of the electrode plate during winding of the electrode plate are reduced, and the prepared electrode plate is high in charge retention rate and high in safety when applied to a battery.
The electrode plate is prepared by the preparation method of the electrode plate, and the electrode plate can improve the charge retention rate of a battery and the safety of the battery when being used as a battery component due to the improvement of the preparation method of the electrode plate.
The battery of an embodiment includes the electrode tab 10, the electrode tab 20, or the electrode tab manufactured by any one of the above methods.
The battery comprises the electrode plate, so that the battery has high charge retention rate and high safety.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following detailed description is given with reference to specific examples. The following examples are not specifically described, and other components except inevitable impurities are not included. The examples, which are not specifically illustrated, employ drugs and equipment, all of which are conventional in the art. The experimental procedures, in which specific conditions are not indicated in the examples, were carried out according to conventional conditions, such as those described in the literature, in books, or as recommended by the manufacturer.
Example 1
Example 1 a total of 5 electrode sheets were prepared, numbered a 1-a 5 in order, and the preparation method of each electrode sheet was as follows:
(1) and filling the electrode material into the current collector with the seepage holes to obtain a composite body. The electrode material consists of nickelous hydroxide, cobaltous oxide and ytterbium trioxide, and the mass ratio of the nickelous hydroxide, the cobaltous oxide and the ytterbium trioxide is 72.5:5.5: 2. And then baking and rolling to form the electrode plate.
(2) The electrode sheet obtained in step (1) was used as a positive electrode, assembled with separator paper and a negative electrode to form a nickel-metal hydride battery, and the performance of the battery was measured according to the method for measuring the charge retention rate, with the results shown in table 1. The method for testing the charge retention rate specifically comprises the following steps:
1) discharging the battery to 1.0V with 0.2C current;
2) charging with 0.1C current for 16 hours;
3) after standing for 2 hours, detecting the initial voltage, the initial internal resistance and the initial capacity of 1.0V by discharging at 0.2C according to the IEC standard;
4) charging the battery for 16 hours by using 0.1C current, and standing for 2 hours;
5) after the battery is stored for 28 days at the temperature of 45 ℃, detecting the voltage, the internal resistance and the 0.2C discharge capacity of the battery to 1.0V according to the IEC standard;
6) the charge retention of the battery was obtained by dividing the discharge capacity of the battery after 28 days by the initial capacity.
Example 2
The structure of the electrode sheet of example 2 is shown in fig. 1. Preparing 5 electrode slices in total, wherein the electrode slices are numbered from B1 to B5 in sequence, and the preparation method of each electrode slice is as follows:
(1) dissolving 3g of carboxymethyl cellulose (CMC) dry powder into 97mL of pure water, stirring for 6h at 45 ℃, then cooling for 36 h at room temperature to discharge air dissolved in the dissolving process, and obtaining carboxymethyl cellulose solution (hereinafter referred to as CMC solution);
(2) and (3) passing the CMC solution through 4MPa of dry compressed air to atomize the CMC solution, and then passing the current collector with the pores through an atomization area formed by the atomization of the CMC solution at a constant speed to form a CMC-containing intermediate membrane on the surface of the current collector. Wherein the thickness of the intermediate film is 0.02 mm.
(3) And filling the electrode material into the current collector to obtain a composite. The electrode material consists of nickelous hydroxide, cobaltous oxide and ytterbium trioxide, and the mass ratio of the nickelous hydroxide, the cobaltous oxide and the ytterbium trioxide is 72.5:5: 2.5.
(4) Passing the composite body through an atomization area formed by atomizing a CMC solution to form a CMC-containing top film on the outer surface of the composite body; the thickness of the top film was 0.02 mm. And then baking and rolling to form the electrode plate.
(5) The electrode sheet obtained in step (4) was used as a positive electrode, and assembled with separator paper and a negative electrode to form a nickel-metal hydride battery, and the performance of the battery was measured according to the method for measuring the charge retention rate, and the results are shown in table 1. The method for testing the charge retention rate specifically comprises the following steps:
1) discharging the battery to 1.0V with 0.2C current;
2) charging with 0.1C current for 16 hours;
3) after standing for 2 hours, detecting the initial voltage, the initial internal resistance and the initial capacity of 1.0V by discharging at 0.2C according to the IEC standard;
4) charging the battery for 16 hours by using 0.1C current, and standing for 2 hours;
5) after the battery is stored for 28 days at the temperature of 45 ℃, detecting the voltage, the internal resistance and the 0.2C discharge capacity of the battery to 1.0V according to the IEC standard;
6) the charge retention of the battery was obtained by dividing the discharge capacity of the battery after 28 days by the initial capacity.
Example 3
The structure of the electrode sheet of example 3 is shown in fig. 1. Preparing 5 electrode slices in total, wherein the electrode slices are numbered from C1 to C5 in sequence, and the preparation method of each electrode slice is as follows:
(1) 500g of a polytetrafluoroethylene emulsion (hereinafter referred to as PTFE emulsion) was weighed and poured into an open U-shaped container. Wherein the mass percentage of the polytetrafluoroethylene in the PTFE emulsion is 60 percent.
(2) And (3) enabling the current collector with the seepage holes to pass through a U-shaped container containing PTFE emulsion at a constant speed, enabling a layer of PTFE emulsion to be uniformly attached to the surface of the current collector, and then drying water through baking to obtain a 0.02mm CMC-containing intermediate membrane.
(3) And filling the electrode material into the current collector to obtain a composite. The electrode material comprises nickel hydroxide, cobaltous oxide and yttrium oxide, and the mass ratio of the nickel hydroxide to the cobaltous oxide to the yttrium oxide is 92:6: 2.
(4) The PTFE emulsion is atomized by passing the PTFE emulsion through 4MPa of dry compressed air; the composite was then passed through an atomization zone formed by the PTFE emulsion, forming a 0.02mm PTFE-containing top film on the outer surface of the composite. And then baking and rolling to form the electrode plate.
(5) The electrode sheet obtained in step (4) was used as a positive electrode, and assembled with separator paper and a negative electrode to form a nickel-metal hydride battery, and the performance of the battery was measured according to the method for measuring the charge retention rate, and the results are shown in table 1. The method for testing the charge retention rate comprises the following specific steps:
1) discharging the battery to 1.0V with 0.2C current;
2) charging with 0.1C current for 16 hours;
3) after standing for 2 hours, detecting the initial voltage, the initial internal resistance and the initial capacity of 1.0V by discharging at 0.2C according to the IEC standard;
4) charging the battery for 16 hours by using 0.1C current, and standing for 2 hours;
5) after the battery is stored for 28 days at the temperature of 45 ℃, detecting the voltage, the internal resistance and the 0.2C discharge capacity of the battery to 1.0V according to the IEC standard;
6) the charge retention of the battery was obtained by dividing the discharge capacity of the battery after 28 days by the initial capacity.
TABLE 1
Figure BDA0002326079360000121
Figure BDA0002326079360000131
As can be seen from table 1, in comparison with example 1, examples 2 and 3 have a very significant improvement in the charge retention rate of the battery, and have a significant effect of improving the long-term storage performance of the battery.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The electrode plate is characterized by comprising a current collector with a seepage hole, an electrode material filled in the seepage hole and a protective film, wherein the protective film comprises a top film and an intermediate film, the intermediate film is arranged on the hole wall of the seepage hole and is bonded with the electrode material and the hole wall, and the top film is bonded with the surface of the current collector.
2. The electrode sheet according to claim 1, wherein the current collector is a mesh structure with pores, one side of the intermediate film is adhered to the walls of the pores, the other side of the intermediate film is adhered to the electrode material, and the top film is coated on the current collector and is adhered to the current collector.
3. The electrode sheet according to claim 1 or 2, wherein the thickness of the secondary membrane is 0.015 to 0.025 mm; and/or
The thickness of the top film is 0.015-0.025 mm.
4. The utility model provides an electrode slice, its characterized in that, includes the mass flow body, by diaphragm and the protection film that electrode material made, the diaphragm is located on the mass flow body, the protection film includes at least one of top film and intermediate coat, the intermediate coat is located the mass flow body with between the diaphragm, and with the mass flow body with the diaphragm bonds, the top film bond cover in the diaphragm is kept away from one side of the mass flow body, the material of protection film is at least one in polytetrafluoroethylene, hydroxypropyl methyl cellulose and the carboxymethyl cellulose.
5. The preparation method of the electrode plate is characterized by comprising the following steps:
and preparing a protective film on the current collector and/or the electrode material by using a solution or emulsion containing a binder, so as to obtain the electrode plate, wherein the binder is at least one of polytetrafluoroethylene, hydroxypropyl methylcellulose and carboxymethyl cellulose.
6. The method for preparing the electrode sheet according to claim 5, wherein the step of preparing the protective film on the current collector by using the solution containing the binder or the emulsion containing the binder to obtain the electrode sheet comprises the following steps:
preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing the binder to obtain the current collector with the protective film; and
coating, filling or rolling an electrode material on the current collector with the protective film to obtain the electrode plate;
further, the step of preparing a protective film on the current collector by using a solution containing a binder or an emulsion containing a binder to obtain the current collector with the protective film comprises:
passing the current collector through an atomization area formed by atomizing a solution containing a binder to obtain the current collector with a protective film; or soaking the current collector in an emulsion containing a binder and then drying to obtain the current collector with the protective film.
7. The method for preparing an electrode sheet according to claim 5, wherein the step of preparing a protective film on the electrode material with a solution containing a binder or an emulsion containing a binder to obtain the electrode sheet comprises:
coating, filling or rolling the electrode material on a current collector to obtain a primary electrode slice; and
preparing a protective film on the primary electrode sheet by using a solution containing a binder or an emulsion containing the binder to obtain the electrode sheet;
further, the step of preparing a protective film on the primary electrode sheet using a solution containing a binder or an emulsion containing a binder includes:
passing the primary electrode sheet through an atomization area formed by atomizing a solution containing a binder to obtain a protective film; or soaking the primary electrode slice in a solution containing a binder and then drying to obtain the protective film.
8. The method for producing the electrode sheet according to claim 5, wherein the protective film includes an intermediate film and a top film, the intermediate film is a film formed on the current collector using the binder-containing solution or the binder-containing emulsion, and the top film is a film formed on the electrode material using the binder-containing solution or the binder-containing emulsion.
9. The method for preparing an electrode sheet according to claim 8, wherein the step of preparing the protective film on the current collector and the electrode material using the binder-containing solution or the binder-containing emulsion comprises:
enabling the current collector to pass through an atomization area formed by atomizing a solution containing a binder or drying the current collector after soaking the current collector in an emulsion containing the binder to obtain an intermediate membrane;
coating, filling or rolling an electrode material on the interlayer film to obtain a composite body; and
and (3) passing the composite through an atomization area formed by atomizing a solution containing the binder or drying the composite after soaking the composite in an emulsion containing the binder to obtain the top film.
10. A battery comprising the electrode sheet according to any one of claims 1 to 4 or the electrode sheet produced by the method for producing an electrode sheet according to any one of claims 5 to 9.
CN201911316922.2A 2019-12-19 2019-12-19 Electrode plate, preparation method thereof and battery Pending CN111063860A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111564639A (en) * 2020-05-28 2020-08-21 贝特瑞新材料集团股份有限公司 Lithium ion battery pole piece, preparation method and application thereof
CN113130843A (en) * 2021-04-10 2021-07-16 中国科学院福建物质结构研究所 Electrode and preparation method thereof
WO2022142639A1 (en) * 2020-12-31 2022-07-07 华为技术有限公司 Negative current collector, preparation method therefor, and lithium metal battery

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102306800A (en) * 2011-08-16 2012-01-04 清华大学 Current collector and lithium ion battery
CN102610831A (en) * 2012-03-26 2012-07-25 龙能科技(苏州)有限公司 Electrode of lithium ion battery and preparation method thereof
CN103151554A (en) * 2009-08-25 2013-06-12 苏州宝时得电动工具有限公司 Lithium sulphur battery
CN103326028A (en) * 2012-03-23 2013-09-25 株式会社半导体能源研究所 Power storage device and method for manufacturing the same
CN103779581A (en) * 2012-10-25 2014-05-07 华为技术有限公司 Porous negative pole piece and preparation method thereof, and lithium ion battery
CN103794794A (en) * 2012-10-30 2014-05-14 华为技术有限公司 Lithium battery anode and preparation method, lithium battery and preparation method and application
CN103855358A (en) * 2012-12-07 2014-06-11 华为技术有限公司 Lithium battery negative electrode as well as preparation method thereof, lithium battery and application
CN104103809A (en) * 2014-07-31 2014-10-15 中国科学院上海硅酸盐研究所 Three-layer electrode structure for alloy anode of lithium ion battery
CN104993150A (en) * 2015-07-04 2015-10-21 广东烛光新能源科技有限公司 Flexible device and preparation method thereof
JP2017091673A (en) * 2015-11-05 2017-05-25 古河電池株式会社 Lithium ion battery
CN207732007U (en) * 2017-10-23 2018-08-14 宁德新能源科技有限公司 Cathode pole piece and lithium ion battery

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103151554A (en) * 2009-08-25 2013-06-12 苏州宝时得电动工具有限公司 Lithium sulphur battery
CN102306800A (en) * 2011-08-16 2012-01-04 清华大学 Current collector and lithium ion battery
CN103326028A (en) * 2012-03-23 2013-09-25 株式会社半导体能源研究所 Power storage device and method for manufacturing the same
CN102610831A (en) * 2012-03-26 2012-07-25 龙能科技(苏州)有限公司 Electrode of lithium ion battery and preparation method thereof
CN103779581A (en) * 2012-10-25 2014-05-07 华为技术有限公司 Porous negative pole piece and preparation method thereof, and lithium ion battery
CN103794794A (en) * 2012-10-30 2014-05-14 华为技术有限公司 Lithium battery anode and preparation method, lithium battery and preparation method and application
CN103855358A (en) * 2012-12-07 2014-06-11 华为技术有限公司 Lithium battery negative electrode as well as preparation method thereof, lithium battery and application
CN104103809A (en) * 2014-07-31 2014-10-15 中国科学院上海硅酸盐研究所 Three-layer electrode structure for alloy anode of lithium ion battery
CN104993150A (en) * 2015-07-04 2015-10-21 广东烛光新能源科技有限公司 Flexible device and preparation method thereof
JP2017091673A (en) * 2015-11-05 2017-05-25 古河電池株式会社 Lithium ion battery
CN207732007U (en) * 2017-10-23 2018-08-14 宁德新能源科技有限公司 Cathode pole piece and lithium ion battery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111564639A (en) * 2020-05-28 2020-08-21 贝特瑞新材料集团股份有限公司 Lithium ion battery pole piece, preparation method and application thereof
CN111564639B (en) * 2020-05-28 2023-02-28 贝特瑞新材料集团股份有限公司 Lithium ion battery pole piece, preparation method and application thereof
WO2022142639A1 (en) * 2020-12-31 2022-07-07 华为技术有限公司 Negative current collector, preparation method therefor, and lithium metal battery
CN113130843A (en) * 2021-04-10 2021-07-16 中国科学院福建物质结构研究所 Electrode and preparation method thereof

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Application publication date: 20200424