CN116259924A - Low-closed-pore-temperature diaphragm and preparation method thereof - Google Patents
Low-closed-pore-temperature diaphragm and preparation method thereof Download PDFInfo
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- CN116259924A CN116259924A CN202310261260.3A CN202310261260A CN116259924A CN 116259924 A CN116259924 A CN 116259924A CN 202310261260 A CN202310261260 A CN 202310261260A CN 116259924 A CN116259924 A CN 116259924A
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- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000004698 Polyethylene Substances 0.000 claims abstract description 107
- -1 polyethylene Polymers 0.000 claims abstract description 107
- 229920000573 polyethylene Polymers 0.000 claims abstract description 106
- 238000009998 heat setting Methods 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 26
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 8
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 abstract description 5
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000012982 microporous membrane Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000005662 Paraffin oil Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a low closed-cell temperature diaphragm and a preparation method thereof, and relates to the technical field of lithium ion batteries, wherein 4-5 kinds of polyethylene in polyethylene A with viscosity average molecular weight of more than 150 Da, polyethylene B with viscosity average molecular weight of 150-100 Da, polyethylene C with viscosity average molecular weight of 100-60 Da, polyethylene D with viscosity average molecular weight of 60-10 Da and polyethylene E with viscosity average molecular weight of 10-0.5 Da are weighed, and at least one of polyethylene A and polyethylene B is weighed; and placing the 4-5 polyethylenes and the plasticizer into a double screw extruder, and sequentially carrying out melt extrusion, sheet casting, first-stage stretching, extraction, second-stage stretching and heat setting to obtain the low-closed-cell-temperature diaphragm. The invention utilizes the ultra-high molecular weight polyethylene to form the diaphragm skeleton structure, thereby improving the stability; the pore canal is constructed by using gradient molecular weight polyethylene, so that the diaphragm can be closed at a lower temperature.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a low-closed-pore-temperature diaphragm and a preparation method thereof.
Background
The separator is one of important components of the lithium ion battery, and plays a decisive role in the safety of the battery. When the lithium battery is abnormally warmed, the diaphragm with low closed pore temperature can close the internal pore in the safe temperature of the active material, stop the battery reaction and avoid the occurrence of thermal failure of the battery. Therefore, it is of great importance to develop a separator with a low closed cell temperature.
Patent CN115377608A discloses a high-safety lithium battery diaphragm and a preparation method thereof, 75-95 parts by mass of PE and 5-15 parts by mass of PP are blended and extruded to obtain the diaphragm with the minimum closed cell temperature of 131 ℃. Patent CN111785894A discloses a preparation method of a low-closed-cell-temperature diaphragm, the prepared low-closed-cell-temperature diaphragm and application thereof, and polyethylene, paraffin oil, an antioxidant and polyethylene wax are mixed, melted and extruded to obtain the diaphragm with the closed-cell temperature of at least 102.4 ℃. Patent CN115566360 discloses a polyolefin microporous membrane, a preparation method and application thereof, wherein polyethylene, polyethylene derivatives and plasticizer are subjected to melting, sheet casting, longitudinal stretching, transverse stretching, extraction and heat setting to obtain the polyolefin microporous membrane, and a membrane with a closed pore temperature of 112 ℃ at the minimum is obtained. Patent CN115483499A discloses a wet multilayer composite lithium ion battery diaphragm, a preparation method and application thereof, polypropylene with different melt indexes, polyethylene with different molecular weights, a solubilizer and a solvent are subjected to auxiliary agent modification, and a diaphragm with a closed pore temperature less than or equal to 130 ℃ is prepared by adopting multi-screw parallel extrusion, wherein the solubilizer is a polyethylene/propylene copolymer. Patent CN106450112a discloses a preparation method of a battery separator, which is obtained by extruding, cooling, molding, extracting, biaxially stretching, heat setting and crosslinking mixed raw materials, wherein the performance of the battery separator can be improved by crosslinking, including lower closed pore temperature, higher rupture temperature and lower thermal shrinkage.
Blending or multilayer extrusion of polyolefin materials with low melting point materials is one of the effective strategies for preparing separators with low closed cell temperatures, however, the poor compatibility between the two materials tends to result in significant defects in the separator, further increasing the risk of thermal failure of the battery. The addition of the block copolymer composed of multiple components as a compatibilizer in the blend system can effectively improve the compatibility between polyolefin and low-melting-point materials, however, the required block copolymer often needs a special method for preparation, and the cost is high. Thus, there is a need to develop a low cost manufacturing process for a separator with low closed cell temperature.
Disclosure of Invention
The invention aims to provide a low closed-cell temperature diaphragm and a preparation method thereof, wherein an ultrahigh molecular weight polyethylene is utilized to form a diaphragm skeleton structure, so that the stability is improved; the pore canal is constructed by using gradient molecular weight polyethylene, so that the diaphragm can be closed at a lower temperature.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method of making a low closed cell temperature separator comprising the steps of:
weighing 4-5 kinds of polyethylene in polyethylene A with viscosity average molecular weight of above 150 Da, polyethylene B with viscosity average molecular weight of 150-100 Da, polyethylene C with viscosity average molecular weight of 100-60 Da, polyethylene D with viscosity average molecular weight of 60-10 Da and polyethylene E with viscosity average molecular weight of 10-0.5 Da, wherein at least one of polyethylene A and polyethylene B is weighed;
and placing the 4-5 polyethylenes and the plasticizer into a double screw extruder, and sequentially carrying out melt extrusion, sheet casting, first-stage stretching, extraction, second-stage stretching and heat setting to obtain the low-closed-cell-temperature diaphragm.
Preferably, the total concentration of polyethylene in the system of polyethylene and plasticizer is 20-40wt%, each polyethylene having a concentration of: polyethylene a:0-35wt%, polyethylene B:0-35wt%, polyethylene C:0-35wt%, polyethylene D:0-35wt%, polyethylene E:0-5wt%, wherein the concentration of polyethylene not added is 0.
Preferably, the plasticizer has a kinematic viscosity at 40 ℃ in the range of 3-100mm 2 The concentration of the white oil per second in the system of polyethylene and plasticizer is 60-80% by weight.
Preferably, the melting temperature of the double-screw extruder is 150-220 ℃, and the length-diameter ratio of the screw is 200:1-40:1.
Preferably, the casting sheet is formed by cooling with multiple cooling rolls at 0-30 ℃.
Preferably, the stretching in the first stage is bidirectional synchronous stretching or bidirectional asynchronous stretching, and the stretching temperature is 115-135 ℃; wherein the MD stretching multiplying power of the bidirectional synchronous stretching is 5-10 times, and the TD stretching multiplying power is 3-8 times; the MD stretching multiplying power of the two-way asynchronous stretching is 5-15 times, and the TD stretching multiplying power is 3-8 times.
Preferably, the extraction is carried out in methylene chloride at a temperature of 0-20 ℃.
Preferably, the second stretch is 3-10 times stretch in the TD direction, and the stretching temperature is 80-110 ℃.
Preferably, the temperature of the heat setting is 80-110 ℃, and the heat setting time is 5-30 seconds.
The low-closed-pore-temperature diaphragm is prepared by the preparation method.
The beneficial effects of the invention are as follows:
1) The five polyethylenes A-E selected in the invention have the following viscosity average molecular weight gradient: a is more than or equal to 150 Da,150 Da is more than or equal to 100 Da,100 Da is more than or equal to 60 Da,60 Da is more than or equal to 10 Da,10 Da is more than or equal to 0.5 Da; wherein the polyethylene A and the polyethylene B belong to ultra-high molecular weight polyethylene, at least one of the ultra-high molecular weight polyethylene forms a diaphragm skeleton structure, and the skeleton structure is more stable at high temperature by utilizing the huge molecular structure of the ultra-high molecular weight polyethylene; and (3) introducing gradient molecular weight polyethylene into the polyethylene A-E to construct pore channels, so that the low-melting-point component is melted at a lower temperature, namely the diaphragm is closed, and the macroscopic dimensional stability is maintained.
2) The gradient molecular weight structure is adopted to form a film, the raw materials between similar molecular weights have stable compatibility, and no obvious interface gap defect exists after the film is formed.
3) The film preparation method is a conventional industrialized polyethylene diaphragm preparation method and has simple process.
4) The membrane preparation raw material is a conventional industrial polyethylene membrane preparation raw material, and the cost is low.
5) The film-making equipment used in the invention is conventional industrialized polyethylene diaphragm production equipment, and has wide universality.
Drawings
Fig. 1 is a surface Scanning Electron Microscope (SEM) photograph of the separator prepared in example 2.
Fig. 2 is a surface Scanning Electron Microscope (SEM) photograph of the separator prepared in comparative example 2.
Detailed Description
In order that the above features and advantages of the invention will be readily understood, a more particular description thereof will be rendered by reference to the appended drawings.
Example 1
Taking 10wt% of polyethylene A with viscosity average molecular weight of 150 Da, 8wt% of polyethylene B with viscosity average molecular weight of 100 Da,10 wt% of polyethylene C with viscosity average molecular weight of 60 Da, 7wt% of polyethylene D with viscosity average molecular weight of 30 Da, 5wt% of polyethylene E with viscosity average molecular weight of 2 Da and motion viscosity of 40mm 2 60 wt./s white oil, consisting of an aspect ratio of 200 at 220 ℃): 1, shaping by a cooling roller at 25 ℃, performing bidirectional synchronous stretching on MD10 times and TD 8 times at 130 ℃ in a first stage, cooling to 25 ℃ by the cooling roller, immersing in dichloromethane at 20 ℃ (extracting), performing second-stage stretching on TD 10 times at 110 ℃, performing heat shaping at 80 ℃ for 30 seconds, and performing cooling and rolling by the cooling roller at 25 ℃ to obtain the polyethylene diaphragm.
Example 2
Taking 5wt% of polyethylene A with viscosity average molecular weight of 150 ten thousand Da,10 wt% of polyethylene B with viscosity average molecular weight of 120 ten thousand Da, 5wt% of polyethylene C with viscosity average molecular weight of 60 ten thousand Da, 5wt% of polyethylene D with viscosity average molecular weight of 30 ten thousand Da, 5wt% of polyethylene E with viscosity average molecular weight of 0.5 ten thousand Da and 50mm of kinematic viscosity 2 70 wt./s white oil consisting of an aspect ratio of 200 at 220 ℃): 1, shaping by a cooling roller at 25 ℃, and then performing two-way identical operation at 135 ℃ in the first stageAnd stretching MD5 times and TD 5 times, cooling to 25 ℃ by a cold roller, immersing in dichloromethane at 20 ℃ (extracting), stretching TD 3 times at 110 ℃ in the second stage, heat setting at 80 ℃ for 30 seconds, and cooling and rolling by the cold roller at 25 ℃ to obtain the polyethylene diaphragm.
Example 3
Taking 5wt% of polyethylene A with viscosity average molecular weight of 150 Da, 5wt% of polyethylene B with viscosity average molecular weight of 140 Da, 5wt% of polyethylene C with viscosity average molecular weight of 80 Da, 5wt% of polyethylene D with viscosity average molecular weight of 10 Da, and 50mm of kinematic viscosity 2 72 wt./s white oil consisting of an aspect ratio of 200 at 220 ℃): 1, shaping by a cooling roller at 30 ℃, carrying out bidirectional synchronous stretching on MD 7 times and TD 3 times at 120 ℃ in a first stage, cooling to 20 ℃ by the cooling roller, immersing in dichloromethane at 20 ℃ (extracting), carrying out second-stage stretching on TD 3 times at 110 ℃, carrying out heat shaping at 80 ℃ for 30 seconds, and carrying out cooling rolling by the cooling roller at 30 ℃ to obtain the polyethylene diaphragm.
Example 4
Taking 35wt% of polyethylene B with viscosity average molecular weight of 100W Da, 2wt% of polyethylene C with viscosity average molecular weight of 60W Da, 2wt% of polyethylene D with viscosity average molecular weight of 10W Da, 1wt% of polyethylene E with viscosity average molecular weight of 0.5W Da, and 50mm of kinematic viscosity 2 72 wt./s white oil consisting of an aspect ratio of 200 at 180 ℃): 1, shaping by a cooling roller at 10 ℃, carrying out bidirectional asynchronous stretching on MD5 times and TD 3 times at 115 ℃ in a first stage, cooling to 25 ℃ by the cooling roller, immersing in methylene dichloride at 10 ℃ for extraction, carrying out second-stage stretching on TD 5 times at 110 ℃, carrying out heat shaping at 90 ℃ for 20 seconds, and carrying out cooling rolling by the cooling roller at 10 ℃ to obtain the polyethylene diaphragm.
Example 5
Taking 35wt% of polyethylene A with viscosity average molecular weight of 160 ten thousand Da, 2wt% of polyethylene C with viscosity average molecular weight of 90 ten thousand Da, 2wt% of polyethylene D with viscosity average molecular weight of 50 ten thousand Da, 1wt% of polyethylene E with viscosity average molecular weight of 9 ten thousand Da, and the kinematic viscosity of 3mm 2 80 wt./s white oil consisting of an aspect ratio of 40 at 150 ℃): 1, shaping by a cooling roller at 0 ℃, and then stretching in a two-way asynchronous mode at 130 ℃ for MD 8 times and TD 15 times in a first stage, and cooling by the cooling rollerImmersing the membrane into dichloromethane at the temperature of 0 ℃ after the temperature reaches 25 ℃ (extracting), then stretching the membrane for TD 3 times at the second stage of 100 ℃, heat-setting the membrane for 5 seconds at the temperature of 110 ℃, and then cooling and rolling the membrane by a cold roller at the temperature of 0 ℃ to obtain the polyethylene membrane.
Example 6
The condition parameters of this example are substantially the same as those of example 1, except that polyethylene A2 wt%, polyethylene B1wt%, polyethylene C35 wt%, polyethylene D1wt% and polyethylene E1wt%.
Example 7
The condition parameters of this example are substantially the same as those of example 1, except that polyethylene A1 wt%, polyethylene B2 wt%, polyethylene C1wt%, polyethylene D35 wt% and polyethylene E1wt%.
Example 8
The condition parameters of this example are substantially the same as those of example 1, except that polyethylene C is not contained.
Example 9
The condition parameters of this example are substantially the same as those of example 1, except that polyethylene D is not contained.
Comparative example 1
The polyethylene was used in an amount of only 28% by weight, and the other was the same as in example 2.
Comparative example 2
The polyethylene was used in an amount of 23% by weight of C and 5% by weight of E, and the same was used in example 2.
The properties of the separator described in examples and comparative examples are shown in table 1.
Table 1 separator properties
It can be seen from table 1 that the closed cell temperature of the polyethylene separator (example) prepared by blending various viscosity average molecular weights can be reduced to 117 ℃, and the strength is significantly improved compared with the single molecular weight system (comparative example 1) or the dual molecular weight system (comparative example 2). In addition, the SEM shows that the surface of the example 2 is of a continuous shape, while the surface of the comparative example 2 prepared by the dual molecular weight system only has obvious crack gaps, and the multi-component system provided by the invention can be proved to obtain the defect-free low closed cell temperature polyethylene membrane.
The testing method comprises the following steps: the separator was tested according to GB/T36363-2018 for thickness, porosity, air permeability, tensile strength, 105 ℃/1h heat shrinkage. The morphology of the coated surface of the samples was characterized using a JSM-7500F scanning electron microscope. The diaphragm obturator temperature was measured using impedance method.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and that modifications and equivalents may be made thereto by those skilled in the art, which modifications and equivalents are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A method for preparing a low closed cell temperature separator, comprising the steps of:
weighing 4-5 kinds of polyethylene in polyethylene A with viscosity average molecular weight of above 150 Da, polyethylene B with viscosity average molecular weight of 150-100 Da, polyethylene C with viscosity average molecular weight of 100-60 Da, polyethylene D with viscosity average molecular weight of 60-10 Da and polyethylene E with viscosity average molecular weight of 10-0.5 Da, wherein at least one of polyethylene A and polyethylene B is weighed;
and placing the 4-5 polyethylenes and the plasticizer into a double screw extruder, and sequentially carrying out melt extrusion, sheet casting, first-stage stretching, extraction, second-stage stretching and heat setting to obtain the low-closed-cell-temperature diaphragm.
2. The method according to claim 1, wherein the total concentration of polyethylene in the system of polyethylene and plasticizer is 20-40wt%, each polyethylene having a concentration of: polyethylene a:0-35wt%, polyethylene B:0-35wt%, polyethylene C:0-35wt%, polyethylene D:0-35wt%, polyethylene E:0-5wt%, wherein the concentration of polyethylene not added is 0.
3. The method of claim 1, wherein the plasticizer has a kinematic viscosity at 40 ℃ in the range of 3-100mm 2 The concentration of the white oil per second in the system of polyethylene and plasticizer is 60-80% by weight.
4. The method of claim 1, wherein the twin screw extruder has a melting temperature of 150 to 220 ℃ and a screw aspect ratio of 200:1 to 40:1.
5. The method of claim 1, wherein the cast sheet is formed by cooling with multiple chill rolls at a temperature of 0-30 ℃.
6. The method of claim 1, wherein the first stage stretching is bi-synchronous stretching or bi-asynchronous stretching at a temperature of 115-135 ℃; wherein the MD stretching multiplying power of the bidirectional synchronous stretching is 5-10 times, and the TD stretching multiplying power is 3-8 times; the MD stretching multiplying power of the two-way asynchronous stretching is 5-15 times, and the TD stretching multiplying power is 3-8 times.
7. The method according to claim 1, wherein the extraction is performed in methylene chloride at a temperature of 0-20 ℃.
8. The method of claim 1, wherein the second stretch is a 3-10 fold stretch in the TD direction and the stretching temperature is 80-110 ℃.
9. The method of claim 1, wherein the heat setting is at a temperature of 80-110 ℃ and a heat setting time of 5-30 seconds.
10. A low closed cell temperature separator prepared by the method of any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116454538A (en) * | 2023-06-16 | 2023-07-18 | 山东华太新能源电池有限公司 | Battery diaphragm material for marine environment and preparation method and application thereof |
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| CN116454538A (en) * | 2023-06-16 | 2023-07-18 | 山东华太新能源电池有限公司 | Battery diaphragm material for marine environment and preparation method and application thereof |
| CN116454538B (en) * | 2023-06-16 | 2023-10-10 | 山东华太新能源电池有限公司 | Battery diaphragm material for marine environment and preparation method and application thereof |
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