CN111477876A - Multilayer film, current collector, pole piece and battery - Google Patents
Multilayer film, current collector, pole piece and battery Download PDFInfo
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- CN111477876A CN111477876A CN201910065703.5A CN201910065703A CN111477876A CN 111477876 A CN111477876 A CN 111477876A CN 201910065703 A CN201910065703 A CN 201910065703A CN 111477876 A CN111477876 A CN 111477876A
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- multilayer film
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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
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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
- 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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- 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
Abstract
The present invention provides a multilayer film comprising at least one insulating layer and at least one conductive layer, wherein the conductive layer has a strippability of 5% or less. The multilayer film of the present invention has excellent heat resistance and chemical resistance, is less likely to generate burrs when subjected to abnormal conditions such as extrusion, impact, or puncture, is lightweight, and can improve the energy density of a battery. The invention also provides a current collector, a pole piece and a battery containing the multilayer film.
Description
Technical Field
The invention belongs to the field of high polymer materials, and relates to a multilayer film, and a current collector, a pole piece and a battery containing the multilayer film.
Background
Lithium ion batteries are widely used in electric vehicles and consumer electronics because of their advantages of high energy density, high output power, long cycle life, and environmental friendliness. However, the lithium ion battery is easily ignited and exploded when being subjected to abnormal conditions such as extrusion, collision or puncture, thereby causing serious safety accidents. Therefore, the safety problem of the lithium ion battery greatly limits the application development of the lithium ion battery.
The main materials of the lithium ion battery comprise: positive electrode, negative electrode, diaphragm, electrolyte. The positive electrode comprises a positive active material and a current collector for bearing the positive active material, and the negative electrode comprises a negative active material and a current collector for bearing the negative active material. The active materials of the positive electrode and the negative electrode are the sources of the electricity of the lithium ion battery, and the current collectors are used for collecting the current and are connected with an external circuit.
When the lithium ion battery is charged, lithium ions are extracted from the positive electrode, penetrate through the diaphragm and are embedded into the negative electrode, and meanwhile, electrons pass through the positive electrode current collector and reach the negative electrode current collector through an external circuit, so that active substances enter the negative electrode and are combined with the lithium ions. During discharging, lithium ions are extracted from the negative electrode, penetrate through the diaphragm and are embedded into the positive electrode, and meanwhile, electrons pass through the negative electrode current collector and reach the positive electrode current collector through an external circuit, so that the electrons enter the positive electrode active material and are combined with the lithium ions.
In the prior art, an aluminum foil is generally used as a positive current collector, and a copper foil is used as a negative current collector. Due to the continuous updating and development of electric vehicles and consumer electronic products, the requirements for the driving mileage of electric vehicles and the standby time of consumer electronic products are continuously increased, and thus the requirements for the energy density of lithium ion batteries are higher and higher. It would be helpful to improve the energy density of lithium ion batteries if the thickness and weight of the current collector could be reduced.
In addition, when the lithium ion battery is subjected to abnormal conditions such as extrusion, collision or puncture, burrs are easily generated on the traditional metal foil current collector, and the diaphragm between the anode and the cathode is punctured, so that the anode and the cathode are in contact short circuit, a large amount of heat is generated, and the temperature of the battery rises. With the rise of the temperature of the battery, the electrolyte, the diaphragm, the anode and the cathode may be decomposed to generate chain reaction, and finally thermal explosion may occur to cause serious safety problems. Therefore, in order to improve the safety of the lithium ion battery and avoid the risk of battery short circuit caused by the current collector, research and development of a novel current collector are necessary.
CN200410085527.5 discloses a current collector formed of a polymer film containing a metal layer for use in a lithium ion battery. Such current collectors can reduce the weight of the battery, thereby increasing energy density. However, the polymer film with the lowest melting point of 80 ℃ is not favorable for the use safety under the current environment with high energy density and high output power. And the adhesion between the polymer film and the metal layer is insufficient, the chemical resistance is insufficient, and a safety problem is also caused.
CN201820257473.3 discloses a current collector comprising an insulating layer and a conductive layer. The use of polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and polymers such as polyamide as the insulating layer may result in insufficient chemical resistance and insufficient adhesion between the metal layers, and thus, the battery using the current collector may have a safety problem in a high energy density and high output environment, and the application field is limited.
Polyphenylene sulfide is an engineering plastic having excellent chemical resistance and heat resistance, and a metal vapor deposited film thereof is often used in a film capacitor. JP2002-319533 discloses a film capacitor based on polyphenylene sulfide. CN200510137497.2 discloses a current collector comprising a polymer layer and a metal layer overlying the polymer layer. The current collector can select polyphenylene sulfide as a polymer layer. However, polyphenylene sulfide also has a problem that the adhesion between the metal layer and the polyphenylene sulfide is insufficient.
Therefore, there is a need for a current collector which has excellent heat resistance and chemical resistance, is less likely to generate burrs when subjected to abnormal conditions such as pressing, collision, or puncture, is lightweight, and can improve the energy density of a battery.
Disclosure of Invention
The present invention provides a multilayer film which has excellent heat resistance and chemical resistance, is less likely to cause burrs when subjected to abnormal conditions such as extrusion, collision, or puncture, is lightweight, and can improve the energy density of a battery.
Specifically disclosed is a multilayer film which contains at least one insulating layer and at least one conductive layer, wherein the conductive layer has a peelability of 5% or less.
The insulating layer is composed of a plastic film, and mechanical strength and heat resistance are provided in the multilayer film of the present invention.
The conductive layer contains a conductive substance and provides conductivity in the multilayer thin film of the present invention.
The adhesion between the insulating layer and the conductive layer greatly affects the heat resistance and chemical resistance of the multilayer film, and the ease with which burrs are generated when the multilayer film is subjected to abnormal conditions such as pressing, collision, or puncture. The adhesion between the conductive layer and the insulating layer can be quantitatively characterized by the degree of strippability of the conductive layer in a certain manner.
The lower the strippability of the conductive layer, the better the adhesion between the conductive layer and the insulating layer. When the strippability of the conductive layer is less than 5%, solvents such as electrolyte in the battery can be blocked by the conductive layer, so that the conductive layer is not easy to contact with the insulating layer, and the chemical resistance of the multilayer film is improved; the supporting function of the conductive layer on the insulating layer is enhanced, so that the heat resistance and the mechanical strength of the multilayer film are improved; the conductive layer is not easy to separate from the insulating layer to form burrs. Preferably, the conductive layer has a strippability of 1% or less.
Preferably, in the multilayer film, the conductive layers are positioned on two sides of the insulating layer; or two insulating layers containing single-side conducting layers are mutually attached, and the conducting layers are positioned on two outer surfaces after attachment.
The insulating layer may contain any polymer material, but in view of improving heat resistance and chemical resistance of the multilayer film, the insulating layer preferably contains one or more of polyester, polyolefin, polyamide, polyimide, polyetherimide, polyether, polyphenylene sulfide, polyether ether ketone, or fluoropolymer.
Further, the heat-resistant temperature of the insulating layer is 140 ℃ or higher. The higher the heat-resistant temperature, the better the heat resistance of the insulating layer and the multilayer film, and the better the safety of the battery. Further, when a conductive layer is provided over an insulating layer, and when an active material is provided over a multilayer film, the insulating layer is heated. The heat-resistant temperature of the insulating layer is more than 140 ℃, and the heat generated during the processing is difficult to have adverse effects on the performance of the insulator, thereby being beneficial to improving the safety of the battery.
The current collector contacts the electrolyte, and a trace amount of water in the electrolyte, during use. In view of improving the resistance of the insulating layer, it is further preferable that the insulating layer has a retention rate of elongation at break of 50% or more (water resistance) after 5 days in saturated water vapor at 155 ℃.
It is further preferable that the insulating layer is flame retardant in view of improving the safety of the battery.
In view of improving the heat resistance of the multilayer film, it is further preferable that the heat shrinkage rate of the insulating layer at 150 ℃ is less than 2%, more preferably less than 1%.
Further, the insulating layer contains one or more of polyphenylene sulfide, polyether ether ketone or fluorine-containing polymer. More preferably, the insulating layer is a biaxially oriented polyphenylene sulfide film. The heat resistance, the drug resistance, the hydrolysis resistance and the mechanical strength of the polyphenylene sulfide film can be enhanced by biaxial stretching, the thermal shrinkage rate is reduced, the uniformity of various performances is improved, the adhesion force with a conductive layer is favorably improved, burrs are not easily generated on the conductive layer, and therefore the biaxial stretching plays a key role in improving the safety of the battery.
The conductive layer may contain various kinds of metals and carbon materials having conductivity, and preferably contains one or more of aluminum, copper, nickel, titanium, silver, or zirconium in consideration of meeting processing conditions and improving battery performance. For the multilayer thin film for a positive electrode, it is preferable that the conductive layer contains one or more of aluminum, titanium, silver, and zirconium. For the multilayer film used for the negative electrode, it is preferable that the conductive layer contains one or more of copper, nickel, silver, and zirconium.
Furthermore, the surface of the conducting layer preferably has a pattern formed by regular polygons, edges of the regular polygons are formed by grooves, the depth of the grooves is 10% -50% of the thickness of the conducting layer, the width of the grooves is 1-30 microns, and the side length of the regular polygons is 1-20 mm. The pattern structure formed by the conductive layer increases the surface roughness of the multi-layered thin film, thereby increasing the adhesion between the electrode active material applied to the multi-layered thin film and the multi-layered thin film.
Further, it is preferable that the regular polygon is one or both of an equilateral triangle and an equilateral hexagon, which is advantageous in forming a stable structure, thereby facilitating improvement of adhesion between the electrode active material applied to the multilayer thin film and the multilayer thin film. Further, the thickness of the insulating layer is preferably 1 to 20 μm. The greater the thickness of the insulating layer, the lower the energy density of the battery using the multilayer thin film; if the thickness of the insulating layer is too low, the mechanical strength and heat resistance of the multilayer film are insufficient.
Further, the thickness of the conductive layer is preferably 1 nm to 6 μm. The thickness of the conducting layer is too large, and burrs are easy to generate when the conducting layer is subjected to abnormal conditions such as extrusion, collision or puncture; the conductive layer has too small thickness and large surface resistance, so that the current is small when the lithium battery is charged and discharged, the charging and discharging speed is slow, and the conductive layer is easily corroded by electrolyte, N-methyl pyrrolidone and other liquids in the battery.
Further, in view of improving the conductivity of the multilayer thin film and the charge and discharge rate of a battery including the multilayer thin film, the surface resistance of the conductive layer of the multilayer thin film is less than 1 Ω/□. For the multilayer film for a positive electrode, it is preferable that the surface resistance of the conductive layer is less than 0.5 Ω/□. For the multilayer film for a negative electrode, it is preferable that the surface resistance of the conductive layer thereof is less than 0.04 Ω/□.
Further, after the conductive layer is treated by electrolyte at 70 ℃ for 1 day, the falling rate of the conductive layer is below 2%. In the electrolyte treatment process, the electrolyte can permeate into the interface of the conductive layer and the insulating layer through the edge of the multilayer film and the defects in the conductive layer, so that the adhesion force is reduced, and part of the conductive layer falls off from the insulating layer. The smaller the peeling rate of the conductive layer, the better the electrolyte resistance of the multilayer film.
The multilayer film can be prepared by arranging the conductive layers on the two sides of the insulating layer by evaporation, vacuum sputtering, metal foil lamination, chemical electrochemical deposition, chemical vapor deposition, physical vapor deposition, thermal spraying and coating methods. The chemical electrochemical deposition comprises chemical plating, composite plating, laser plating and the like. The conductive layers may also be provided by a variety of methods, either sequentially or simultaneously. In view of production efficiency and improvement of purity of the conductive layer, it is preferable that the conductive layer is provided on the insulating layer by an evaporation method, the purity being a percentage of a mass of a substance having the largest content in the conductive layer to a total mass of the conductive layer. The higher the purity, the less the conductive layer and the insulating layer are affected by the electrolyte and the like, and the higher the overall performance of the multilayer film.
In order to achieve an effect that the conductive layer has a peelability of 5% or less, it is preferable to provide a primer layer or an adhesive layer on the surface of the insulating layer, or to perform plasma treatment, corona treatment, or the like before providing the conductive layer on the insulating layer.
The surface pattern of the conductive layer can be prepared by a known method. For example, the insulating layer is first embossed and coated to form patterns on the surface of the insulating layer, and then the conductive layer is arranged on the insulating layer, so that the patterns on the surface of the insulating layer are formed on the surface of the conductive layer; or the conductive layer can be arranged on the insulating layer firstly, and then embossing and coating treatment are carried out on the conductive layer, so that the surface of the conductive layer is provided with patterns.
The multilayer film of the present invention has the effect of reducing the strippability of the conductive layer to 5% or less, thereby providing a multilayer film having excellent heat resistance and chemical resistance, being less likely to cause burrs when subjected to abnormal conditions such as extrusion, collision, or puncture, being lightweight, and being capable of improving the energy density of a battery.
The invention also provides a current collector which comprises the multilayer film.
The invention also provides a pole piece, which comprises the current collector, the pole piece can be prepared by a known method, for example, an electrode active material is coated on the surface of the current collector, and is dried, rolled and cut to form the pole piece, the electrode active material comprises a positive electrode active material and a negative electrode active material, the positive electrode active material can be one of a lithium cobaltate (L CO) system, a nickel-cobalt-manganese ternary (NCM) system, a nickel-cobalt-aluminum ternary (NCA) system or a lithium iron phosphate (L FP) system, the negative electrode active material can be one of a graphite system, a silicon-carbon system or metal lithium and an alloy thereof, the coating thickness of the electrode active material is 10-100 micrometers, the drying condition can be divided into three stages, for example, the first stage is dried at 80 ℃ for 1-5 min, the second stage is dried at 110 ℃ for 1-5 min, and the third stage is dried at 80 ℃ for 1-5 minThe rolling compaction density can be controlled to be 1.3-3.8 mg/cm3。
The invention also provides a battery, which comprises the pole piece.
The battery can be used in the fields of consumer electronics such as mobile phones, notebook computers and the like, electric automobiles, energy storage power stations and the like.
Detailed Description
The present invention is described in more detail by the following examples, which are not intended to limit the present invention.
The electrolyte treatment methods described in the examples and comparative examples are as follows:
electrolyte treatment:
step 1), placing the current collector sample cut into 8cm × 8cm in an aluminum plastic film bag;
step 2) injecting an electrolyte into the aluminum plastic film bag provided with the current collector in the step 1) in an environment with water and oxygen content of less than 0.1ppm by volume, wherein the electrolyte contains a lithium salt, a solvent and an additive, the lithium salt contains one or more of lithium bis (trifluoromethylsulfonate) imide (L iTFSI), lithium perchlorate (L iClO4), lithium tetrafluoroborate (L iBF4), lithium hexafluorophosphate (L iPF6) or lithium hexafluoroarsenate (L iAsF6), the solvent contains one or more of Propylene Carbonate (PC), Ethylene Carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC), and the additive is VC, and the amount of the electrolyte is enough to immerse the current collector;
step 3) carrying out vacuum sealing on the aluminum-plastic film bag containing the current collector and the electrolyte in the step 2);
step 4) placing the sealed aluminum plastic film bag filled with the current collector and the electrolyte in the step 3) in a drying oven at 70 ℃, and taking out after continuously placing for 1 day;
and 5) taking the current collector sample treated in the step 4) out of the electrolyte in an environment with the water-oxygen volume content of less than 0.1ppm, soaking and cleaning for 3 times by using a diethyl carbonate solvent, and airing for subsequent testing.
The test methods used in the examples and comparative examples are as follows, and for all tests, if the test temperature is not specified, the test is carried out at 23 ℃.
Thickness of the insulating layer:
the test was performed using a thickness gauge. The thickness of the sample was measured at 3 different locations and the arithmetic mean of these 3 thicknesses was taken as the specimen thickness.
Thickness of the conductive layer:
the areal density of the conductive layer was measured in μ g/cm using an X-ray fluorescence spectrometer (ZSX Primus III +, Japan science)2. The samples were tested for areal density at 3 different locations to give an average areal density, AD. The thickness of the conductive layer was calculated as follows in nm. Where ρ isConductive layerIs the density of the material of the conductive layer, in g/cm3. Thickness of conductive layer AD/rhoConductive layer
Surface resistance:
the test was carried out using a four-probe resistance tester (model MCP-T610 manufactured by Mitsubishi chemical corporation). The square resistance values of 3 different positions of the sample are tested, and the arithmetic mean of the 3 square resistance values is taken as the square resistance value of the sample.
Strippability of conductive layer:
a sample is cut into a sample strip of 2.5cm wide and 18cm long, a polar bear PP212 adhesive tape produced by Shanghai polar bear Stationery adhesive tape Co., Ltd, of 1.2cm wide and 15cm long is attached to a conductive layer, one end (A end) of the adhesive tape is fixed to the sample, and the other end (B end) of the adhesive tape is left to have a sufficient length and is not attached to the sample, the adhesive tape and the conductive layer are tightly attached to each other by rolling 3 times on the attachment region using a roller of 2kg weight, and after the attachment region is peeled 180 DEG at a speed of 20000mm/min and the peeling length is set to 14 cm., a VPA-2 type high-speed peeling machine produced by KYOWA Co., Ltd is used to fix the sample to a moving platform of the apparatus, the B end of the adhesive tape is fixed to the fixed end of the apparatus, and after the peeling length is set to 14 cm., the area ratio of the peeled conductive layer to the peeled area of the peeled area (14cm long × 1.2.2 cm wide) is determined as the peeling degree of.
Heat resistance temperature:
the temperature at which the storage modulus of the sample was 500MPa was measured as the heat resistance temperature under the conditions of 3 ℃/min, a frequency of 1Hz, and an amplitude of 20 μm in a film stretching mode using a dynamic mechanical analyzer (model DMA Q800, TA, U.S.A.).
Heat shrinkage ratio:
the sample was heated at 150 ℃ for 30min, and the dimensional change rate of the sample in the MD direction was measured.
Water resistance:
the sample was treated in saturated steam at 155 ℃ for 5 days, and the elongation at break of the sample before and after the treatment was measured, the retention of the elongation at break was × 100% of the elongation at break after the treatment/the elongation at break before the treatment.
After the electrolyte treatment, the falling rate of the conductive layer:
and (4) counting the falling area of the conductive layer after the treatment of the electrolyte, wherein the area ratio of the falling area to the area (8cm × 8cm) of the sample is the falling rate of the conductive layer.
The materials used in the examples and comparative examples are as follows:
PP: biaxially oriented Polypropylene film, manufactured by Toray corporation
2172, thickness of 6 μm, heat resistance temperature 125 deg.C, thermal shrinkage 5.3% at 150 deg.C, and elongation at break retention 65% after 5 days of treatment in saturated steam at 155 deg.C.
PET: biaxially oriented polyethylene terephthalate film, manufactured by Toray corporation
2F-51 with the thickness of 2 microns, the heat-resistant temperature of 150 ℃, the heat shrinkage rate of 1.4 percent at 150 ℃, and the elongation at break retention rate of 1 percent after being treated in saturated steam at 155 ℃ for 5 days.
PPS: biaxially oriented polyphenylene sulfide film, manufactured by Touli corporation
1x00, thickness of 4 microns, heat resistance temperature of 175 ℃, heat shrinkage rate of 0.04% at 150 ℃ and saturated steam immersion at 155 DEG CThe elongation at break after 5 days was maintained at 80%.
PI: polyimide film, product of DuPont
HN, thickness 25 micron, heat-resisting temperature>The heat shrinkage rate at 200 ℃ and 150 ℃ is 0.24 percent, and the elongation at break is kept at 10 percent after the treatment in saturated steam at 155 ℃ for 5 days.
Al: zhongnuo new material (Beijing) Ltd, 5N type.
Cu: zhongnuo new material (Beijing) Ltd., type 6N.
Examples 1 to 5
According to the components shown in Table 1, an evaporator (TEMD-500 model, produced by Beijing Taikeno technologies, Ltd.) was used to perform plasma treatment on a certain surface of the insulating layer under the conditions of a gas pressure of 1Pa, an oxygen flow rate of 80sccm, a bias voltage of 800V, and a treatment time of 30 s; metal deposition was then performed on the plasma-treated surface to the target thickness shown in table 1. Then, the same plasma treatment and metal vapor deposition were performed on the other surface of the insulating layer, thereby obtaining a multilayer thin film. The obtained samples were subjected to various performance tests, and the results are shown in Table 1.
The metal evaporation conditions were as follows:
vapor deposition of Al at a gas pressure of 3 × 10-3Pa, evaporation rate of 0.4 nm/s;
vapor deposition of Cu at a gas pressure of 3 × 10-3Pa, evaporation rate 0.5 nm/s.
Comparative examples 1 to 5
A multilayer film was produced with the components shown in table 2 under the conditions of example 1, but without plasma treatment. The obtained samples were subjected to various performance tests, and the results are shown in Table 2.
Examples 6 and 7
A multilayer film was fabricated according to the conditions of example 1 with the compositions shown in table 3, and a pattern of equilateral triangles, the edges of which were formed by grooves having a depth of 20nm, the width of which was 15 μm, and the side length of which was 10mm, was formed on the surface of the conductive layer by embossing. The obtained samples were subjected to various performance tests, and the results are shown in Table 3.
It can be seen from the test data of each example and comparative example that the conductive layer of each example has a strippability of 5% or less, and the multilayer film has excellent heat resistance and chemical resistance, and is less likely to generate burrs when subjected to abnormal conditions such as pressing, collision, or puncture.
TABLE 1
TABLE 2
Note: "/" indicates no testing is performed Table 3
Claims (15)
1. A multilayer film comprising at least one insulating layer and at least one conductive layer, wherein the conductive layer has a peelability of 5% or less.
2. The multilayer film according to claim 1, wherein the conductive layer has a strippability of 1% or less.
3. The multilayer film according to claim 1, wherein the insulating layer has a heat resistance temperature of 140 ℃ or higher.
4. The multilayer film according to claim 3, wherein the insulating layer has a retention of elongation at break of 50% or more after 5 days in saturated water vapor at 155 ℃.
5. The multilayer film of claim 3, wherein the insulating layer comprises one or more of polyphenylene sulfide, polyetheretherketone, or a fluoropolymer.
6. The multilayer film of claim 5, wherein said insulating layer is a biaxially oriented polyphenylene sulfide film.
7. The multilayer film of claim 1, wherein the conductive layer comprises one or more of aluminum, copper, nickel, titanium, silver, or zirconium.
8. A multilayer film according to claim 1, wherein the surface of the conductive layer has a pattern of regular polygons, edges of the regular polygons are formed by grooves, a depth of the grooves is 10 to 50% of a thickness of the conductive layer, a width of the grooves is 1 to 30 micrometers, and a side length of the regular polygons is 1 to 20 mm.
9. The multilayer film of claim 8, wherein the regular polygon is one or both of an equilateral triangle or an equilateral hexagon.
10. The multilayer film of claim 1, wherein the thickness of the insulating layer is 1 to 20 microns.
11. The multilayer film of claim 1, wherein the thickness of the conductive layer is from 1 nm to 6 μm.
12. The multilayer film according to claim 1, wherein the conductive layer has a peeling rate of 2% or less after the treatment with the electrolyte at 70 ℃ for 1 day.
13. A current collector comprising the multilayer film according to any one of claims 1 to 12.
14. A pole piece comprising the current collector of claim 13.
15. A battery comprising the pole piece of claim 14.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114284504A (en) * | 2021-12-22 | 2022-04-05 | 上海恩捷新材料科技有限公司 | Composite current collector, preparation method thereof, pole piece thereof and battery |
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| CN114284504B (en) * | 2021-12-22 | 2023-11-28 | 上海恩捷新材料科技有限公司 | Composite current collector, preparation method thereof, pole piece and battery |
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