CN113410577A - High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof - Google Patents
High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof Download PDFInfo
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- CN113410577A CN113410577A CN202110553049.XA CN202110553049A CN113410577A CN 113410577 A CN113410577 A CN 113410577A CN 202110553049 A CN202110553049 A CN 202110553049A CN 113410577 A CN113410577 A CN 113410577A
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- 238000009413 insulation Methods 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 90
- 238000000576 coating method Methods 0.000 claims abstract description 90
- 239000002270 dispersing agent Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 20
- 239000000853 adhesive Substances 0.000 claims abstract description 19
- 230000001070 adhesive effect Effects 0.000 claims abstract description 19
- 238000005524 ceramic coating Methods 0.000 claims abstract description 19
- 239000006255 coating slurry Substances 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 239000010453 quartz Substances 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 13
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000011247 coating layer Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims description 18
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 5
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 5
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229910001593 boehmite Inorganic materials 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- -1 drying Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920004482 WACKER® Polymers 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002002 slurry 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
- H01M50/431—Inorganic material
- H01M50/434—Ceramics
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- 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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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 invention discloses a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm and a preparation method thereof, wherein the preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing a dispersing agent, water and quartz fibers, adding ceramic powder, sanding, adding an adhesive, uniformly mixing to obtain ceramic coating slurry, coating the ceramic coating slurry on a base film, drying, coating the ceramic coating slurry on a first coating, drying, and coating an ethylene-vinyl acetate copolymer on a second coating to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm.
Description
Technical Field
The invention belongs to the technical field of diaphragms, and particularly relates to a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm and a preparation method thereof.
Background
With the progress of social development and the increasing severity of environmental problems, new energy products are promoted to be produced, new energy automobiles serve as prominent ones, people have higher requirements on the endurance and safety performance of lithium ion battery automobiles, and lithium battery diaphragms play an important role as safety guarantee army.
The common diaphragm is polypropylene or polyethylene diaphragm, and these basic diaphragms do not have strong temperature resistance and enough insulating property, and do not play a role of protection for lithium ion batteries with high capacity requirements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm.
The invention also aims to provide the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm obtained by the preparation method.
The purpose of the invention is realized by the following technical scheme.
A preparation method of a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm comprises the following steps:
1) uniformly mixing a dispersing agent, water and quartz fibers, then adding ceramic powder, sanding, adding an adhesive, and uniformly mixing to obtain ceramic coating slurry, wherein the ratio of the dispersing agent to the water to the quartz fibers to the ceramic powder to the adhesive is (0.12-0.65): (36-60): (2-8): (20-40): (5-8);
in the step 1), stirring for 10-20min at a stirring speed of 1500-3100 r/min to uniformly mix the dispersing agent, the water and the quartz fiber.
In the step 1), the dispersing agent is sodium hexametaphosphate, sodium tripolyphosphate or ammonium tripolyphosphate, the ceramic powder is alumina, boehmite, magnesium hydroxide, silicon dioxide or barium sulfate, and the adhesive is styrene butadiene rubber, polyvinylidene fluoride, sodium carboxymethylcellulose or polyacrylamide.
In the step 1), the sanding time is 10-20min, and the rotation speed is 500-700 r/min.
In the step 1), the adhesive is added and then uniformly mixed, namely stirring is carried out at the ultrasonic frequency of 10-20 kHz, the stirring speed is 1000-2000r/min, and the stirring time is 10-20 min.
2) Coating the ceramic coating slurry on a base film on one side or both sides to form one or two first coating layers on the base film to obtain a first coating film;
in the step 2), the base film is a PE film.
In the step 2), the coating speed is 30-50 m/min, and the thickness of the first coating is 2-5 μm.
3) Drying the first coating film obtained in the step 2);
in the step 3), the drying temperature is 50-70 ℃, and the drying time is 2-4 min.
4) Coating ceramic coating slurry on the first coating obtained in the step 3) so as to form a second coating on the first coating, thereby obtaining a second coating film;
in the step 4), the coating speed is 50-80 m/min, and the thickness of the second coating is 1-3 μm.
5) Drying the second coating film obtained in the step 4);
in the step 3), the drying temperature is 50-70 ℃, and the drying time is 2-4 min.
6) Coating an ethylene-vinyl acetate copolymer on the second coating obtained in the step 5) to form a third coating on the second coating, so as to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, wherein the vinyl acetate in the ethylene-vinyl acetate copolymer is 20-28 wt%.
In the step 6), the coating speed is 20-50 m/min, and the thickness of the third coating is 1-3 μm.
The high-temperature-resistant high-insulation high-cycle lithium battery diaphragm prepared by the preparation method.
According to the invention, the quartz fiber in the ceramic coating slurry can be used for remarkably improving the temperature resistance and the insulativity of the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, and a layer of organic slurry of ethylene-vinyl acetate copolymer with the vinyl acetate content of 20-28 wt% is coated, so that the effect of bonding a pole piece and the diaphragm is achieved, the lithium ion movement distance is reduced, and the cycle performance of the battery can be effectively improved.
Detailed Description
The technical scheme of the invention is further explained by combining specific examples.
All coating machines are Dongshi 1350 type coating machines;
the mixers are all of a Hodgte 30L type;
the ultrasonic equipment is all Kunshan adhesive KH2200 type;
ethylene-vinyl acetate copolymers were purchased from wacker, germany.
The base film used in the following examples had a thickness of 12 μm.
Example 1
A preparation method of a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm comprises the following steps:
1) mixing a dispersing agent, water and quartz fibers in a planetary stirring device, stirring for 10min at a stirring speed of 1500r/min to uniformly mix the dispersing agent, the water and the quartz fibers, adding ceramic powder, sanding for 20min at a rotating speed of 500r/min, adding an adhesive, stirring for 15min at a rotating speed of 1500r/min under an ultrasonic frequency of 13kHz to obtain ceramic coating slurry, wherein the ratio of the dispersing agent to the water to the quartz fibers to the ceramic powder to the adhesive is 0.65: 60: 8: 23.35: 8; the dispersing agent is sodium hexametaphosphate, the ceramic powder is alumina, and the adhesive is polyacrylamide.
2) And (3) coating the ceramic coating slurry on a base film which is a PE film on one side by using a coating machine to form a first coating layer on the base film to obtain the first coating film, wherein the coating speed is 30m/min, and the thickness of the first coating layer is 2 mu m.
3) Drying the first coating film obtained in the step 2) at 50 ℃ for 2 min;
4) coating the ceramic coating slurry on the first coating layer obtained in the step 3) by using a coater to form a second coating layer on the first coating layer to obtain a second coating film, wherein the coating speed is 50m/min, and the thickness of the second coating layer is 1 μm.
5) Drying the second coating film obtained in the step 4) at 50 ℃ for 2 min;
6) and (3) coating ethylene-vinyl acetate copolymer on the second coating obtained in the step 5) by using a coating machine to form a third coating on the second coating, so as to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, wherein the vinyl acetate in the ethylene-vinyl acetate copolymer is 25 wt%, the coating speed is 20m/min, and the thickness of the third coating is 3 microns.
Example 2
A preparation method of a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm comprises the following steps:
1) mixing a dispersing agent, water and quartz fibers in a planetary stirring device, stirring for 20min at a stirring speed of 2100r/min to uniformly mix the dispersing agent, the water and the quartz fibers, adding ceramic powder, sanding for 15min at a rotating speed of 600r/min, adding an adhesive, stirring for 15min at a rotating speed of 1800r/min under an ultrasonic frequency of 13kHz to obtain ceramic coating slurry, wherein the ratio of the dispersing agent to the water to the quartz fibers to the ceramic powder to the adhesive is 0.38: 41: 5: 38.62: 5; the dispersing agent is sodium hexametaphosphate, the ceramic powder is alumina, and the adhesive is polyacrylamide.
2) And (3) coating the ceramic coating slurry on a base film which is a PE film on one side by using a coating machine to form a first coating layer on the base film to obtain the first coating film, wherein the coating speed is 30m/min, and the thickness of the first coating layer is 3 mu m.
3) Drying the first coating film obtained in the step 2) at 60 ℃ for 3 min;
4) coating the ceramic coating slurry on the first coating layer obtained in the step 3) by using a coater to form a second coating layer on the first coating layer to obtain a second coating film, wherein the coating speed is 60m/min, and the thickness of the second coating layer is 2 μm.
5) Drying the second coating film obtained in the step 4) at 60 ℃ for 3 min;
6) and (3) coating ethylene-vinyl acetate copolymer on the second coating obtained in the step 5) by using a coating machine to form a third coating on the second coating, so as to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, wherein the vinyl acetate in the ethylene-vinyl acetate copolymer is 25 wt%, the coating speed is 40m/min, and the thickness of the third coating is 2.5 mu m.
Example 3
A preparation method of a high-temperature-resistant high-insulation high-cycle lithium battery diaphragm comprises the following steps:
1) mixing a dispersing agent, water and quartz fibers in a planetary stirring device, stirring for 10min at a stirring speed of 2000r/min to uniformly mix the dispersing agent, the water and the quartz fibers, adding ceramic powder, sanding for 10min at a rotating speed of 700r/min, adding an adhesive, stirring for 10min at a rotating speed of 2000r/min under an ultrasonic frequency of 13kHz to obtain ceramic coating slurry, wherein the ratio of the dispersing agent to the water to the quartz fibers to the ceramic powder to the adhesive is 0.5: 46: 7.5: 40: 6; the dispersing agent is sodium hexametaphosphate, the ceramic powder is alumina, and the adhesive is polyacrylamide.
2) And (3) coating the ceramic coating slurry on a base film which is a PE film on one side by using a coating machine to form a first coating layer on the base film to obtain the first coating film, wherein the coating speed is 50m/min, and the thickness of the first coating layer is 5 mu m.
3) Drying the first coating film obtained in the step 2) for 4min at 65 ℃;
4) coating the ceramic coating slurry on the first coating layer obtained in the step 3) by using a coater to form a second coating layer on the first coating layer to obtain a second coating film, wherein the coating speed is 75m/min, and the thickness of the second coating layer is 2 μm.
5) Drying the second coating film obtained in the step 4) at 70 ℃ for 4 min;
6) and (3) coating ethylene-vinyl acetate copolymer on the second coating obtained in the step 5) by using a coating machine to form a third coating on the second coating, so as to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, wherein the vinyl acetate in the ethylene-vinyl acetate copolymer is 25 wt%, the coating speed is 50m/min, and the thickness of the third coating is 1 mu m.
The high-temperature-resistant high-insulation high-cycle lithium battery diaphragm obtained in the embodiment 1-3 is tested, and the test result is as follows:
every high temperature resistant high insulation high cycle lithium battery diaphragm tests 15 times insulation value, gets the average, obtains the insulation average of the high temperature resistant high insulation high cycle lithium battery diaphragm of embodiment 1 ~ 3 gained, and the test result is as follows:
the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm obtained in the embodiment 1-3 is assembled into a battery (90mm long, 60mm wide and 6mm high), the positive electrode material is nickel-cobalt-manganese, the negative electrode material is graphite, and the electrolyte is lithium hexafluorophosphate. 3 batteries were assembled from each of the high-temperature-resistant, high-insulation, and high-cycle lithium battery separators obtained in examples 1 to 3, and tests were performed.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. The preparation method of the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm is characterized by comprising the following steps of:
1) uniformly mixing a dispersing agent, water and quartz fibers, then adding ceramic powder, sanding, adding an adhesive, and uniformly mixing to obtain ceramic coating slurry, wherein the ratio of the dispersing agent to the water to the quartz fibers to the ceramic powder to the adhesive is (0.12-0.65): (36-60): (2-8): (20-40): (5-8);
2) coating the ceramic coating slurry on a base film on one side or both sides to form one or two first coating layers on the base film to obtain a first coating film;
3) drying the first coating film obtained in the step 2);
4) coating ceramic coating slurry on the first coating obtained in the step 3) so as to form a second coating on the first coating, thereby obtaining a second coating film;
5) drying the second coating film obtained in the step 4);
6) coating an ethylene-vinyl acetate copolymer on the second coating obtained in the step 5) to form a third coating on the second coating, so as to obtain the high-temperature-resistant high-insulation high-cycle lithium battery diaphragm, wherein the vinyl acetate in the ethylene-vinyl acetate copolymer is 20-28 wt%.
2. The preparation method according to claim 1, wherein in the step 1), the dispersant, the water and the quartz fiber are uniformly mixed by stirring at a stirring speed of 1500 to 3100r/min for 10 to 20 min;
in the step 1), the dispersing agent is sodium hexametaphosphate, sodium tripolyphosphate or ammonium tripolyphosphate, the ceramic powder is alumina, boehmite, magnesium hydroxide, silicon dioxide or barium sulfate, and the adhesive is styrene butadiene rubber, polyvinylidene fluoride, sodium carboxymethylcellulose or polyacrylamide.
3. The preparation method as claimed in claim 1, wherein in the step 1), the sanding time is 10-20min, and the rotation speed is 500-700 r/min;
in the step 1), the adhesive is added and then uniformly mixed, namely stirring is carried out at the ultrasonic frequency of 10-20 kHz, the stirring speed is 1000-2000r/min, and the stirring time is 10-20 min.
4. The production method according to claim 1, wherein in the step 2), the base film is a PE film.
5. The method of claim 1, wherein in the step 2), the coating speed is 30 to 50m/min, and the thickness of the first coating layer is 2 to 5 μm.
6. The preparation method according to claim 1, wherein in the step 3), the drying temperature is 50-70 ℃ and the drying time is 2-4 min.
7. The method of claim 1, wherein in the step 4), the coating speed is 50 to 80m/min, and the thickness of the second coating layer is 1 to 3 μm.
8. The preparation method according to claim 1, wherein in the step 3), the drying temperature is 50-70 ℃ and the drying time is 2-4 min.
9. The method of claim 1, wherein in the step 6), the coating speed is 20 to 50m/min, and the thickness of the third coating layer is 1 to 3 μm.
10. The high-temperature-resistant high-insulation high-cycle lithium battery separator obtained by the preparation method according to any one of claims 1 to 9.
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| CN202110553049.XA CN113410577A (en) | 2021-05-20 | 2021-05-20 | High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof |
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| CN202110553049.XA CN113410577A (en) | 2021-05-20 | 2021-05-20 | High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188666A (en) * | 2021-11-23 | 2022-03-15 | 河北金力新能源科技股份有限公司 | High-heat-resistance high-insulation lithium battery diaphragm and preparation method thereof |
| CN115395173A (en) * | 2022-08-18 | 2022-11-25 | 河北金力新能源科技股份有限公司 | High-heat-resistance high-insulation lithium battery diaphragm and preparation method thereof |
| CN115483500A (en) * | 2022-09-21 | 2022-12-16 | 河北金力新能源科技股份有限公司 | High-circulation-rate diaphragm and preparation method thereof |
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| CN115483500A (en) * | 2022-09-21 | 2022-12-16 | 河北金力新能源科技股份有限公司 | High-circulation-rate diaphragm and preparation method thereof |
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