CN110635092A - Polar polyolefin separator and preparation method thereof - Google Patents
Polar polyolefin separator and preparation method thereof Download PDFInfo
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- CN110635092A CN110635092A CN201910799869.XA CN201910799869A CN110635092A CN 110635092 A CN110635092 A CN 110635092A CN 201910799869 A CN201910799869 A CN 201910799869A CN 110635092 A CN110635092 A CN 110635092A
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- polyolefin
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- 229920000098 polyolefin Polymers 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229920006112 polar polymer Polymers 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 49
- -1 alkyl sulfonic acid compound Chemical group 0.000 claims description 31
- 239000007822 coupling agent Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 29
- 239000004698 Polyethylene Substances 0.000 claims description 19
- 229920000573 polyethylene Polymers 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 238000009998 heat setting Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 229920001112 grafted polyolefin Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 125000000524 functional group Chemical group 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- ZDEIQGWACCNREP-UHFFFAOYSA-N 1-azido-2,3,4,5,6-pentafluorobenzene Chemical compound FC1=C(F)C(F)=C(N=[N+]=[N-])C(F)=C1F ZDEIQGWACCNREP-UHFFFAOYSA-N 0.000 claims description 3
- 229920002614 Polyether block amide Polymers 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Chemical group 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 125000003368 amide group Chemical group 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 125000004185 ester group Chemical group 0.000 claims description 3
- 125000001033 ether group Chemical group 0.000 claims description 3
- 239000011812 mixed powder Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 3
- 239000011118 polyvinyl acetate Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Chemical group 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 claims description 2
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 125000000542 sulfonic acid group Chemical group 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 13
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920006385 Geon Polymers 0.000 description 1
- 239000004705 High-molecular-weight polyethylene Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- CTRLRINCMYICJO-UHFFFAOYSA-N phenyl azide Chemical class [N-]=[N+]=NC1=CC=CC=C1 CTRLRINCMYICJO-UHFFFAOYSA-N 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/42—Introducing metal atoms or metal-containing groups
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- 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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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a polar polyolefin diaphragm and a preparation method thereof. The invention improves the electrolyte wettability, the liquid absorption and retention rate and the ionic conductivity of the polyolefin diaphragm, can also ensure that the polyolefin and the polar polymer are melted and blended to form a stable homogeneous system, and reduces the introduction of a compatibilizer.
Description
Technical Field
The invention belongs to the field of lithium battery diaphragm materials, and particularly relates to a polar polyolefin diaphragm and a preparation method thereof.
Background
The lithium ion battery diaphragm is one of the core materials of the lithium ion battery, and in the lithium ion battery, the lithium ion battery diaphragm mainly has two functions: separating the positive and negative electrode materials of the battery to prevent the two electrodes from being in direct contact and short circuit; and secondly, the porous structure of the diaphragm can hold a large amount of electrolyte, so that the lithium ions can be rapidly conducted in the diaphragm.
According to the difference of the forming method, the lithium ion battery diaphragm is divided into a wet diaphragm and a dry diaphragm, and the lithium ion battery diaphragm relates to a diaphragm made of polyethylene and polypropylene as main materials. The traditional polyolefin diaphragm is a non-polar material, has poor wettability with electrolyte and seriously influences the stable application of the diaphragm in a battery.
In recent years, researchers have attempted to improve the wettability of a separator with an electrolyte by modifying polyolefin from a material viewpoint based on many limitations of polyolefin separators. For example, by an in-situ blending method (CN109244336A), an aliphatic high polymer having polar groups is added to a high molecular weight polyethylene, and the two substances form a stable homogeneous system in a plasticizing stage through the effect of a compatibilizer, so that the porous structures on the surface and inside of the obtained separator are both infiltrated by a large amount of electrolytes, thereby greatly improving the overall electrophilic electrolyte performance. However, further research shows that the effect is not ideal when the compatibilizer is used to melt and blend polyolefin and polar materials to form a stable homogeneous system, and the blending of the compatibilizer, the polyolefin and the polar materials has high requirements on an extrusion process and is not beneficial to cost control.
Disclosure of Invention
In view of the above, the present invention provides a polar polyolefin separator and a preparation method thereof, which can improve the electrolyte wettability, the liquid absorption and retention rate, and the ionic conductivity of the polyolefin separator, and can also melt and blend polyolefin and a polar polymer to form a stable homogeneous system, thereby reducing the introduction of a compatibilizer.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses a polar polyolefin diaphragm which is mainly formed by blending a polar polymer and a polyolefin material, wherein the polyolefin material is a polyolefin material grafted by a coupling agent.
As a preferable technical scheme, the polar polymer is a polymer containing a polar functional group, and the polar functional group comprises one or more of an ether group, an amide group, an ester group, a sulfonic group and a hydroxyl group.
As a preferred technical scheme, the polar polymer comprises one or more of polyether/polyolefin block polymer, block polyether amide resin, polyvinyl acetate, secondary alkyl sulfonic acid compound and polyvinyl alcohol.
As a preferred technical solution, the polyolefin material includes polyethylene powder, polypropylene powder or a mixed powder of polyethylene and polypropylene.
As a preferable technical scheme, the coupling agent comprises one or more of gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, 3-mercaptopropyl triethoxysilane and a perfluorinated phenyl azide compound.
As a preferred technical scheme, the mass ratio of the polar polymer to the polyolefin material is 1:100-20: 100.
The invention also discloses a preparation method (wet method) of the polar polyolefin diaphragm, which comprises the following steps: firstly, mixing a polyolefin material and a coupling agent for grafting reaction, then mixing the polyolefin material grafted by the coupling agent with a polar polymer and a plasticizer for melt extrusion, and then at least carrying out the steps of sheet casting, longitudinal stretching, transverse stretching, extraction and heat setting to obtain the polar polyolefin diaphragm;
the invention also discloses a preparation method (dry method) of another polar polyolefin diaphragm, which comprises the following steps: firstly, mixing a polyolefin material and a coupling agent for grafting reaction, then mixing the polyolefin material grafted by the coupling agent with a polar polymer for melting and extruding, and then at least carrying out the steps of sheet casting, annealing, stretching and heat setting to obtain the polar polyolefin diaphragm.
In the preparation method, the specific steps of mixing the polyolefin material and the coupling agent for grafting reaction are as follows: mixing and stirring a polyolefin material and a silane coupling agent, adding an initiator, and carrying out grafting reaction under an ice bath condition to obtain a coupling agent grafted polyolefin material; or mixing and stirring the polyolefin material and the perfluorophenyl azide, and carrying out grafting reaction under the ultraviolet radiation condition to obtain the coupling agent grafted polyolefin material.
The invention has the beneficial effects that:
the polyolefin material is grafted by the coupling agent, so that the homogeneous phase capacity of the polyolefin material and the polar polymer in a molten state is improved, then the polyolefin material and the polar polymer are blended, and the polar functional group is introduced into the polyolefin diaphragm, so that the surface tension of the polyolefin diaphragm is improved, the wettability of a base film and electrolyte is improved, and the liquid absorption and retention rate and the ionic conductivity are improved. The invention improves the electrolyte wettability, the liquid absorption and retention rate and the ionic conductivity of the polyolefin diaphragm, can also ensure that the polyolefin and the polar polymer are melted and blended to form a stable homogeneous system, and reduces the introduction of a compatibilizer.
Detailed Description
The present invention is further described with reference to specific examples to enable those skilled in the art to better understand the present invention and to practice the same, but the examples are not intended to limit the present invention.
Example 1:
a. grafting reaction: mixing and stirring polyethylene powder and gamma-aminopropyltriethoxysilane, adding a trace amount of initiator, and reacting under an ice bath condition to prepare coupling agent grafted polyethylene;
b. melting the ingredients: respectively putting 1 wt% of polyether/polyolefin block polymer (trademark PELECTRON PVL), 29 wt% of coupling agent grafted polyethylene and 70 wt% of white oil into a double screw, and mixing and melting to form a high-temperature melt;
c. die head extrusion: melting the materials in a double screw into a high-temperature melt, wherein the temperature of the double screw is 210 ℃, accurately metering the high-temperature melt by a metering pump, feeding the high-temperature melt into a die head, and the temperature of the die head is 210 ℃, wherein the high-temperature melt flows out from a slit opening of the die head;
d. cooling and forming the cast sheet: the high-temperature melt flows out of a slot of the die head to the surface of the chill roll, the temperature of the chill roll is controlled at 30 ℃, and the chill roll is rapidly cooled and formed to form an oil-containing cast sheet;
e. and (3) bidirectional stretching: preheating an oil-containing cast sheet, and then performing biaxial stretching, wherein the biaxial stretching multiple is 6 times; the biaxial stretching temperature is 120 ℃, and an oil-containing film is obtained;
f. and (3) extraction: immersing the oil-containing film into an extraction tank containing dichloromethane, wherein the temperature of the extraction tank is 20 ℃, and extracting the white oil;
g. and (3) drying: putting the extracted film into a drying oven, and volatilizing an extracting agent dichloromethane to obtain a dried film;
h. transversely stretching and expanding: feeding the dried film into a transverse drawing machine, heating, and transversely drawing and expanding, wherein the transverse drawing multiple is 1.25 times, the transverse drawing temperature is 120 ℃, and the film holes are ensured not to shrink;
i. heat setting: and (3) feeding the transversely-pulled film into a heat setting device, wherein the heat setting temperature is 120 ℃, eliminating the internal stress of the film, and improving the heat shrinkage performance of the diaphragm to obtain the polar polyethylene diaphragm.
Example 2:
the difference between this example and example 1 is that step b, ingredient melting: 2 wt% of block polyether amide resin (No. MV2080), 28 wt% of coupling agent grafted polyethylene and 70 wt% of white oil are respectively put into a double screw to be mixed and melted to form a high-temperature melt.
Example 3:
the difference between this example and example 1 is that step b, ingredient melting: respectively putting 3 wt% of polyvinyl acetate, 27 wt% of coupling agent grafted polyethylene and 70 wt% of white oil into a double screw, mixing and melting to form a high-temperature melt.
Example 4:
the difference between this example and example 1 is that step b, ingredient melting: 4 wt% of secondary sodium alkylsulfonate (trade name Mersolat H95), 26 wt% of polyethylene grafted with a coupling agent and 70 wt% of white oil were separately charged into a twin screw and mixed and melted to form a high temperature melt.
Example 5:
the difference between this example and example 1 is that step b, ingredient melting: respectively putting 5 wt% of polyvinyl alcohol (the brand of Ningxia geon 2699), 25 wt% of coupling agent grafted polyethylene and 70 wt% of white oil into a double screw, and mixing and melting to form a high-temperature melt.
Example 6:
this example differs from example 1 in step a, the grafting reaction: mixing and stirring polyethylene powder and a perfluorinated phenyl azide, and reacting under the condition of ultraviolet radiation to prepare the coupling agent grafted polyethylene.
Comparative example 1:
a. melting the ingredients: respectively putting 30 wt% of polyethylene powder and 70 wt% of white oil into a double screw, and mixing and melting to form a high-temperature melt;
b. die head extrusion: melting the materials in a double screw into a high-temperature melt, wherein the temperature of the double screw is 210 ℃, accurately metering the high-temperature melt by a metering pump, feeding the high-temperature melt into a die head, and the temperature of the die head is 210 ℃, wherein the high-temperature melt flows out from a slit opening of the die head;
c. cooling and forming the cast sheet: the high-temperature melt flows out of a slot of the die head to the surface of the chill roll, the temperature of the chill roll is controlled at 30 ℃, and the chill roll is rapidly cooled and formed to form an oil-containing cast sheet;
d. and (3) bidirectional stretching: preheating an oil-containing cast sheet, and then performing biaxial stretching, wherein the biaxial stretching multiple is 6 times; the biaxial stretching temperature is 120 ℃, and an oil-containing film is obtained;
e. and (3) extraction: immersing the oil-containing film into an extraction tank containing dichloromethane, wherein the temperature of the extraction tank is 20 ℃, and extracting the white oil;
f. and (3) drying: putting the extracted film into a drying oven, and volatilizing an extracting agent dichloromethane to obtain a dried film;
g. transversely stretching and expanding: feeding the dried film into a transverse drawing machine, heating, and transversely drawing and expanding, wherein the transverse drawing multiple is 1.25 times, the transverse drawing temperature is 120 ℃, and the film holes are ensured not to shrink;
h. heat setting: and (3) feeding the transversely pulled film into a heat setting device, wherein the heat setting temperature is 120 ℃, eliminating the internal stress of the film, and improving the heat shrinkage performance of the diaphragm to obtain the polyethylene diaphragm.
The separators obtained in examples 1 to 6 and comparative example 1 were subjected to performance tests under the same conditions, and the results are shown in table 1.
TABLE 1 comparison of results of membrane Performance tests
From the ionic conductivity properties of table 1, the conventional polyolefin separator of comparative example 1 has a low ionic conductivity, and the modified polyolefin separators of examples 1 to 6 have excellent ionic conductivity. The wettability with the electrolyte is characterized by testing the contact angle of the separator with the electrolyte, the contact angle of the modified polyolefin separator of examples 1-6 is in the range of 35-40 degrees, while the contact angle of the conventional polyolefin separator with the electrolyte is 45 degrees, so that the conventional polyolefin separator of comparative example 1 is obviously inferior to that of examples 1-6. The comprehensive performance of the diaphragm after the cell is wound is characterized by testing the percentage of the diaphragm maintaining electrolyte, and it can be seen that the traditional polyolefin diaphragm of comparative example 1 is obviously inferior to examples 1-6, which shows that the introduction of polar functional groups, such as ether groups, amide groups, ester groups, sulfonic groups, etc., can promote the electrochemical cycle performance of the polyolefin diaphragm.
In addition, the appearance of the separator obtained in examples 1-6 is good, and no white spots, wrinkles and the like appear, which indicates that the polyolefin and the polar polymer are melt blended to form a stable homogeneous system in examples 1-6 without introducing a compatibilizer.
The above examples only illustrate the polyolefin material as polyethylene powder, and it will be understood by those skilled in the art that similar technical effects can be achieved when the polyolefin material is selected from polypropylene powder, mixed powder of polyethylene and polypropylene, or other polyolefin materials.
The above examples only illustrate the wet preparation of polyolefin separators, and it will be understood by those skilled in the art that the present invention is equally applicable to dry preparation of polyolefin separators: firstly, mixing a polyolefin material and a coupling agent for grafting reaction, then mixing the polyolefin material grafted by the coupling agent with a polar polymer for melting and extruding, and then at least carrying out the steps of sheet casting, annealing, stretching and heat setting to obtain the polar polyolefin diaphragm.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A polar polyolefin separator characterized by: the polar polyolefin diaphragm is mainly formed by blending a polar polymer and a polyolefin material, wherein the polyolefin material is a coupling agent grafted polyolefin material.
2. The polar polyolefin separator according to claim 1, wherein: the polar polymer is a polymer containing polar functional groups, and the polar functional groups comprise one or more of ether groups, amide groups, ester groups, sulfonic acid groups and hydroxyl groups.
3. The polar polyolefin separator according to claim 2, wherein: the polar polymer comprises one or more of polyether/polyolefin block polymer, block polyether amide resin, polyvinyl acetate, secondary alkyl sulfonic acid compound and polyvinyl alcohol.
4. The polar polyolefin separator according to claim 1, wherein: the polyolefin material comprises polyethylene powder, polypropylene powder or mixed powder of polyethylene and polypropylene.
5. The polar polyolefin separator according to claim 1, wherein: the coupling agent comprises one or more of gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane and a perfluorophenyl azide compound.
6. A polar polyolefin separator according to any one of claims 1 to 5, characterized in that: the mass ratio of the polar polymer to the polyolefin material is 1:100-20: 100.
7. The method for preparing a polar polyolefin separator according to any one of claims 1 to 6, wherein: the method comprises the following steps: firstly, mixing a polyolefin material and a coupling agent for grafting reaction, then mixing the polyolefin material grafted by the coupling agent with a polar polymer and a plasticizer for melt extrusion, and then at least carrying out the steps of sheet casting, longitudinal stretching, transverse stretching, extraction and heat setting to obtain the polar polyolefin diaphragm.
8. The method for preparing a polar polyolefin separator according to claim 7, wherein: the specific steps of mixing the polyolefin material and the coupling agent for grafting reaction are as follows: mixing and stirring a polyolefin material and a silane coupling agent, adding an initiator, and carrying out grafting reaction under an ice bath condition to obtain a coupling agent grafted polyolefin material; or mixing and stirring the polyolefin material and the perfluorophenyl azide, and carrying out grafting reaction under the ultraviolet radiation condition to obtain the coupling agent grafted polyolefin material.
9. The method for preparing a polar polyolefin separator according to any one of claims 1 to 6, wherein: the method comprises the following steps: firstly, mixing a polyolefin material and a coupling agent for grafting reaction, then mixing the polyolefin material grafted by the coupling agent with a polar polymer for melting and extruding, and then at least carrying out the steps of sheet casting, annealing, stretching and heat setting to obtain the polar polyolefin diaphragm.
10. The method for preparing a polar polyolefin separator according to claim 9, wherein: the specific steps of mixing the polyolefin material and the coupling agent for grafting reaction are as follows: mixing and stirring a polyolefin material and a silane coupling agent, adding an initiator, and carrying out grafting reaction under an ice bath condition to obtain a coupling agent grafted polyolefin material; or mixing and stirring the polyolefin material and the perfluorophenyl azide, and carrying out grafting reaction under the ultraviolet radiation condition to obtain the coupling agent grafted polyolefin material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809477A (en) * | 2020-05-31 | 2021-12-17 | 重庆恩捷纽米科技股份有限公司 | Closed-pore characteristic battery diaphragm and preparation method and application thereof |
| CN114497880A (en) * | 2022-01-28 | 2022-05-13 | 武汉微美新材料科技有限公司 | Diaphragm and lithium ion battery comprising same |
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| CN101798713A (en) * | 2010-04-01 | 2010-08-11 | 东华大学 | Multicomponent composite eccentric fiber and preparation method thereof |
| CN101838421A (en) * | 2010-05-31 | 2010-09-22 | 南京工业大学 | Preparation method of modified filler/polypropylene composite material |
| CN109244336A (en) * | 2018-11-01 | 2019-01-18 | 上海恩捷新材料科技有限公司 | Lithium ion battery separator and preparation method thereof is blended in a kind of wet process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809477A (en) * | 2020-05-31 | 2021-12-17 | 重庆恩捷纽米科技股份有限公司 | Closed-pore characteristic battery diaphragm and preparation method and application thereof |
| CN114497880A (en) * | 2022-01-28 | 2022-05-13 | 武汉微美新材料科技有限公司 | Diaphragm and lithium ion battery comprising same |
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Application publication date: 20191231 |