CN116646680A - Separator based on linear low density polyethylene and metallocene polyethylene, and preparation method and application thereof - Google Patents
Separator based on linear low density polyethylene and metallocene polyethylene, and preparation method and application thereof Download PDFInfo
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- CN116646680A CN116646680A CN202310344620.6A CN202310344620A CN116646680A CN 116646680 A CN116646680 A CN 116646680A CN 202310344620 A CN202310344620 A CN 202310344620A CN 116646680 A CN116646680 A CN 116646680A
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- coating
- linear low
- density polyethylene
- polyethylene
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- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 title claims abstract description 35
- 229920000092 linear low density polyethylene Polymers 0.000 title claims abstract description 35
- 239000004707 linear low-density polyethylene Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000007765 extrusion coating Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 29
- 239000000853 adhesive Substances 0.000 claims description 28
- 230000001070 adhesive effect Effects 0.000 claims description 28
- 239000002270 dispersing agent Substances 0.000 claims description 28
- 229910001593 boehmite Inorganic materials 0.000 claims description 14
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 9
- 229920000058 polyacrylate Polymers 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 150000003863 ammonium salts Chemical group 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000035515 penetration Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 8
- 238000004321 preservation Methods 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000006255 coating slurry Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a diaphragm based on linear low density polyethylene and metallocene polyethylene, a preparation method and application thereof, wherein the diaphragm comprises the linear low density polyethylene and the metallocene polyethylene at the same time, and the diaphragm can comprise: a base film and a coating overlying the base film, the coating comprising: linear low density polyethylene and metallocene polyethylene. According to the invention, the linear low-density polyethylene and the metallocene polyethylene are used on the surface of the base film, so that the heat resistance and puncture resistance of the diaphragm can be effectively improved, and compared with other slurries, the slurry provided by the invention can effectively reduce the coating thickness by using an extrusion coating process, thereby reducing the thickness of the diaphragm, improving the penetration of burrs through the diaphragm, and improving the durability of a battery and the endurance of a new energy electric vehicle.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a separator based on linear low-density polyethylene and metallocene polyethylene, and a preparation method and application thereof.
Background
With the development of the age, new energy electric vehicles have become a component of life of people slowly, but the safety, endurance and the like of lithium ion batteries serving as power sources of electric vehicles are scientific research important points, and lithium battery diaphragms play an important role in the lithium ion batteries.
The cruising ability of electric vehicles has become a focus of more attention. The endurance of the electric automobile is prolonged, on one hand, the capacity of the lithium battery is improved, and on the other hand, the problem of short circuit safety caused by the fact that burrs of a pole piece of the lithium battery pierce through a diaphragm in the operation process of the electric automobile is solved. Solving the problem of burrs penetrating the septum can generally be achieved by increasing the septum's needle penetration resistance and reducing the septum thickness. The conventional lithium battery diaphragm is a PP or PE diaphragm, has relatively general puncture resistance strength performance, and cannot meet the requirements.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a preparation method of a slurry based on linear low density polyethylene and metallocene polyethylene.
It is another object of the present invention to provide a slurry obtained by the above preparation method.
It is another object of the present invention to provide a separator obtained based on the above slurry.
It is another object of the present invention to provide the use of a linear low density polyethylene in combination with a metallocene polyethylene to increase the needling strength in a separator.
The aim of the invention is achieved by the following technical scheme.
A separator comprising both linear low density polyethylene and metallocene polyethylene. For example, the diaphragm may include: a base film and a coating overlying the base film, the coating comprising: linear low density polyethylene and metallocene polyethylene.
A process for preparing a slurry based on linear low density polyethylene and metallocene polyethylene, comprising the steps of:
uniformly stirring a dispersing agent, water, linear low-density polyethylene, metallocene polyethylene and boehmite, carrying out ultrasonic treatment, adding an adhesive, stirring, carrying out ultrasonic treatment and sanding to obtain slurry, wherein the ratio of the dispersing agent to the water to the linear low-density polyethylene to the metallocene polyethylene to the boehmite to the adhesive is (0.1-0.5): (71-85): (2.5-5): (2.5-5): (5-10): (5-8);
in the technical scheme, the rotation speed of the stirring is 1500-3100 r/min, the revolution speed is 10-60 r/min, and the stirring time before the adhesive is added is 10-20 min.
In the technical scheme, the ultrasonic frequency before the adhesive is added is 10-50 kHz, and the ultrasonic time is 10-20 min.
In the technical scheme, the rotation speed of the stirring and ultrasonic wave is 1000-3900 r/min, the revolution speed is 20-50 r/min, and the ultrasonic wave frequency after the adhesive is added is 5-9 kHz.
In the technical scheme, the dispersing agent is an ammonium salt dispersing agent.
In the above technical scheme, the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on one side or two sides of a base film, forming a coating on the surface of the base film, and drying.
In the technical scheme, the coating speed is 1-2 m/min.
In the technical scheme, the thickness of the coating is 1-5 mu m.
In the above technical solution, the coating is extrusion coating.
In the technical scheme, the drying temperature is 50-70 ℃ and the drying time is 1-3 min.
Use of a linear low density polyethylene and a metallocene polyethylene together in a separator to increase the needling strength.
The invention has the advantages and beneficial effects that:
according to the invention, the linear low-density polyethylene and the metallocene polyethylene are used on the surface of the base film, so that the heat resistance and puncture resistance of the diaphragm can be effectively improved, and compared with other slurries, the slurry provided by the invention can effectively reduce the coating thickness by using an extrusion coating process, thereby reducing the thickness of the diaphragm, improving the penetration of burrs through the diaphragm, and improving the durability of a battery and the endurance of a new energy electric vehicle.
Drawings
FIG. 1 is an SEM of a separator obtained from the slurry of example 1;
FIG. 2 is an SEM of a separator obtained from the slurry of example 2;
fig. 3 is an SEM of a separator obtained from the slurry in example 3.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
The raw materials involved in the following examples are as follows:
linear low density polyethylene: have a bright life.
Metallocene polyethylene blend: have a bright life.
And (3) an adhesive: and (3) polyacrylate.
The base film in the following examples was 10.4 μm thick.
The relevant instrumentation used in the following examples is as follows:
planetary stirring device: haojiett 30L form.
Ultrasonic equipment: kunshan Hechuang KH2200 type.
Sand mill: peler bar pin type nano sand mill.
All tests were performed under standard atmospheric conditions, i.e. temperature: 23-27 ℃; relative humidity: 55% -65%; atmospheric pressure: 94kPa to 98kPa.
Example 1
A method for preparing a linear low density polyethylene-based slurry, comprising the steps of:
in a planetary stirring device, mixing a dispersing agent, water, linear low-density polyethylene and boehmite, stirring at a rotation speed of 3100r/min and a revolution speed of 20r/min for 10min to be uniform, carrying out ultrasonic treatment at a frequency of 50kHz for 10min, adding an adhesive, stirring at a rotation speed of 1000r/min and a revolution speed of 20r/min and carrying out ultrasonic treatment (5 kHz) for 8min, and carrying out sanding at a rotation speed of 700r/min for 10min to obtain a slurry, wherein the ratio of the dispersing agent, the water, the linear low-density polyethylene, the boehmite and the adhesive is 0.2 in parts by weight: 79.8:5:10:5, a step of; the dispersant is an ammonium salt dispersant (A4040 of Basoff, germany) and the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on the surface of a base film at a coating speed of 1m/min on a coating machine, forming a coating on the surface of the base film, drawing the base film into an oven by a drawing roller, and drying at 50 ℃ for 3min to obtain the battery diaphragm, wherein the base film is a PE base film, the thickness of the coating is 2.8 mu m, and the coating is extrusion coating.
Example 2
A method for preparing a metallocene polyethylene-based slurry, comprising the steps of:
in a planetary stirring device, mixing a dispersing agent, water, metallocene polyethylene and boehmite, stirring at a rotation speed of 2000r/min and a revolution speed of 50r/min for 15min to be uniform, carrying out ultrasonic treatment at a frequency of 30kHz for 10min, adding an adhesive, stirring at a rotation speed of 2900r/min and a revolution speed of 20r/min and carrying out ultrasonic treatment (6 kHz) for 6min, and carrying out sanding at a rotation speed of 700r/min for 10min to obtain a slurry, wherein the ratio of the dispersing agent, the water, the metallocene polyethylene, the boehmite and the adhesive is 0.3 in parts by weight: 78.7:5:10:6, preparing a base material; the dispersant is an ammonium salt dispersant (A4040 of Basoff, germany) and the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on the surface of a base film at a coating speed of 1m/min on a coating machine, forming a coating on the surface of the base film, drawing the base film into an oven by a drawing roller, and drying at 50 ℃ for 2min to obtain the battery diaphragm, wherein the base film is a PE base film, the thickness of the coating is 2.76 mu m, and the coating is extrusion coating.
Example 3
A process for preparing a slurry based on linear low density polyethylene and metallocene polyethylene, comprising the steps of:
in a planetary stirring device, mixing a dispersing agent, water, linear low-density polyethylene, metallocene polyethylene and boehmite, stirring at a rotation speed of 1500r/min and a revolution speed of 50r/min for 20min to uniformity, ultrasonically stirring at a frequency of 50kHz for 10min, adding an adhesive, stirring at a rotation speed of 3900r/min and a revolution speed of 30r/min and ultrasonically (9 kHz) for 3min, and sanding at a rotation speed of 700r/min for 10min to obtain a slurry, wherein the ratio of the dispersing agent, the water, the linear low-density polyethylene, the metallocene polyethylene, the boehmite and the adhesive is 0.5 in parts by weight: 76.5:5:5:5:8, 8; the dispersant is an ammonium salt dispersant (A4040 of Basoff, germany) and the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on the surface of a base film at a coating speed of 1m/min on a coating machine, forming a coating on the surface of the base film, drawing the base film into an oven by a drawing roller, and drying at 50 ℃ for 1min to obtain the battery diaphragm, wherein the base film is a PE base film, the thickness of the coating is 1 mu m, and the coating is extrusion coating.
The particle sizes of the slurries prepared in examples 1 to 3 were tested and are shown in Table 1.
TABLE 1
As can be seen from Table 1, the slurry prepared in example 1 has a particle diameter D90 of 1.876. Mu.m, the slurry prepared in example 2 has a particle diameter D90 of 1.843. Mu.m, the slurry prepared in example 3 has a particle diameter D90 of 1.091. Mu.m, the slurry prepared in the invention has a particle diameter far smaller than that of the slurries prepared in examples 1 and 2, and the slurry has a more compact structure, the synergy between the linear low-density polyethylene and the metallocene polyethylene leads to the formation of a compact space structure when coated on a PE base film, the particles are fine, the dispersion degree is good, the solid particles can be well wetted, the prepared coating is uniform, the surface is flat, no vertical scratches are generated, the particles are not easy to precipitate, agglomerate and the like in the storage process, and the storage stability is good.
The thicknesses of the resulting separators and coatings prepared in examples 1 to 3 are shown in table 2.
TABLE 2
| Examples | Thickness of diaphragm (Unit: μm) | Thickness of coating (Unit: μm) |
| Examples1 | 13.24 | 2.80 |
| Example 2 | 13.18 | 2.76 |
| Example 3 | 11.44 | 1.00 |
As can be seen from table 2, the thickness of the coating layer formed by the slurry coating prepared in example 1 was about 2.80 μm, the thickness of the coating layer formed by the slurry coating prepared in example 2 was about 2.76 μm, the thickness of the coating layer formed by the slurries prepared in example 1 and example 2 was not greatly different, and the thickness of the coating layer formed by the slurry obtained in example 3 was thinner than that of the coating layer formed by the slurries prepared in example 1 and example 2. The slurry obtained in example 3 can be used with less raw materials, lower slurry consumption and lower film transportation cost.
Fig. 1 to 3 are electron microscopic views of the separator obtained from the slurry in examples 1 to 3, and it is apparent that the separator obtained from the slurry in example 3 in fig. 3 has a more dense spatial structure.
The heat resistance of the separators obtained from the slurries obtained in examples 1 to 3 was measured, and the measurement results are shown in table 3.
TABLE 3 Table 3
As is clear from Table 3, the separator obtained in example 1 had a heat shrinkage of 2.83% in the transverse direction and 2.97% in the longitudinal direction after heat preservation at 130℃for 1 hour; the separator obtained in example 2 had a heat shrinkage of 4.42% in the transverse direction and 4.17% in the longitudinal direction after heat preservation at 130℃for 1 hour; the separator obtained in example 3 had a heat shrinkage of 1.00% in the transverse direction and 0.70% in the longitudinal direction after heat preservation at 130℃for 1 hour.
The separator obtained in example 1 had a heat shrinkage of 6.82% in the transverse direction and 6.80% in the longitudinal direction after 1 hour incubation at 150 ℃): the separator obtained in example 2 had a heat shrinkage of 9.35% in the transverse direction and 9.19% in the longitudinal direction after heat preservation at 150℃for 1 hour; the separator obtained in example 3 had a heat shrinkage of 1.67% in the transverse direction and 1.59% in the longitudinal direction after heat preservation at 150℃for 1 hour.
The separator obtained in example 1 had a heat shrinkage of 25.84% in the transverse direction and 25.12% in the longitudinal direction after heat preservation at 180℃for 1 hour; the separator obtained in example 2 had a heat shrinkage of 35.38% in the transverse direction and 34.87% in the longitudinal direction after heat preservation at 180℃for 1 hour; the separator obtained in example 3 had a heat shrinkage of 5.83% in the transverse direction and 3.75% in the longitudinal direction after heat preservation at 180℃for 1 hour.
From the above data, the technical solution of the present invention is significantly better in obtaining slurry heat resistance than examples 1 and 2.
The slurries of examples 1 to 3 were used to obtain separators and tested as in Table 4.
TABLE 4 Table 4
Example 4
A process for preparing a slurry based on linear low density polyethylene and metallocene polyethylene, comprising the steps of:
in a planetary stirring device, mixing a dispersing agent, water, linear low-density polyethylene, metallocene polyethylene and boehmite, stirring at a rotation speed of 1500r/min and a revolution speed of 50r/min for 20min to uniformity, ultrasonically stirring at a frequency of 50kHz for 10min, adding an adhesive, stirring at a rotation speed of 3900r/min and a revolution speed of 30r/min and ultrasonically (9 kHz) for 3min, and sanding at a rotation speed of 700r/min for 10min to obtain a slurry, wherein the ratio of the dispersing agent, the water, the linear low-density polyethylene, the metallocene polyethylene, the boehmite and the adhesive is 0.5 in parts by weight: 76.5:4:4:7:8, 8; the dispersant is an ammonium salt dispersant (A4040 of Basoff, germany) and the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on the surface of a base film at a coating speed of 1m/min on a coating machine, forming a coating on the surface of the base film, drawing the base film into an oven by a drawing roller, and drying at 50 ℃ for 1min to obtain the battery diaphragm, wherein the base film is a PE base film, the thickness of the coating is 1.05 mu m, and the coating is extrusion coating.
Example 5
A process for preparing a slurry based on linear low density polyethylene and metallocene polyethylene, comprising the steps of:
in a planetary stirring device, mixing a dispersing agent, water, linear low-density polyethylene, metallocene polyethylene and boehmite, stirring at a rotation speed of 1500r/min and a revolution speed of 50r/min for 20min to uniformity, ultrasonically stirring at a frequency of 50kHz for 10min, adding an adhesive, stirring at a rotation speed of 3900r/min and a revolution speed of 30r/min and ultrasonically (9 kHz) for 3min, and sanding at a rotation speed of 700r/min for 10min to obtain a slurry, wherein the ratio of the dispersing agent, the water, the linear low-density polyethylene, the metallocene polyethylene, the boehmite and the adhesive is 0.5 in parts by weight: 76.5:3:3:9:8, 8; the dispersant is an ammonium salt dispersant (A4040 of Basoff, germany) and the adhesive is polyacrylate.
A battery diaphragm is prepared by coating slurry on the surface of a base film at a coating speed of 1m/min on a coating machine, forming a coating on the surface of the base film, drawing the base film into an oven by a drawing roller, and drying at 50 ℃ for 1min to obtain the battery diaphragm, wherein the base film is a PE base film, the thickness of the coating is 1.12 mu m, and the coating is extrusion coating.
The battery separators obtained in example 4 and example 5 were subjected to the test as in table 5, specifically as follows:
TABLE 5
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A separator comprising both linear low density polyethylene and metallocene polyethylene.
2. A process for the preparation of a slurry based on linear low density polyethylene and metallocene polyethylene, characterized in that it comprises the steps of:
uniformly stirring a dispersing agent, water, linear low-density polyethylene, metallocene polyethylene and boehmite, carrying out ultrasonic treatment, adding an adhesive, stirring, carrying out ultrasonic treatment and sanding to obtain slurry, wherein the ratio of the dispersing agent to the water to the linear low-density polyethylene to the metallocene polyethylene to the boehmite to the adhesive is (0.1-0.5): (71-85): (2.5-5): (2.5-5): (5-10): (5-8).
3. The preparation method according to claim 1, wherein the rotation speed of the uniform stirring is 1500-3100 r/min, the revolution speed is 10-60 r/min, and the stirring time before the adhesive is added is 10-20 min.
4. The method according to claim 3, wherein the frequency of the ultrasonic wave before the addition of the adhesive is 10 to 50kHz and the ultrasonic wave time is 10 to 20min.
5. The method according to claim 4, wherein the stirring and ultrasonic wave has a rotation speed of 1000-3900 r/min, a revolution speed of 20-50 r/min, and an ultrasonic wave frequency of 5-9 kHz after the adhesive is added.
6. The method of claim 5, wherein the dispersant is an ammonium salt dispersant; the adhesive is polyacrylate.
7. A slurry obtained by the production method according to any one of claims 2 to 6.
8. A battery separator, wherein the slurry according to claim 7 is coated on the surface of a base film on one side or both sides, a coating layer is formed on the surface of the base film, and the battery separator is obtained by drying.
9. The battery separator according to claim 8, wherein the coating speed is 1 to 2m/min;
the thickness of the coating is 1-5 mu m; the coating is extrusion coating.
10. Use of a linear low density polyethylene and a metallocene polyethylene together in a separator to increase the needling strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310344620.6A CN116646680A (en) | 2023-04-03 | 2023-04-03 | Separator based on linear low density polyethylene and metallocene polyethylene, and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310344620.6A CN116646680A (en) | 2023-04-03 | 2023-04-03 | Separator based on linear low density polyethylene and metallocene polyethylene, and preparation method and application thereof |
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| CN116646680A true CN116646680A (en) | 2023-08-25 |
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