CN112467307A - Lithium ion battery ceramic diaphragm and preparation method thereof - Google Patents
Lithium ion battery ceramic diaphragm and preparation method thereof Download PDFInfo
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- CN112467307A CN112467307A CN202011334663.9A CN202011334663A CN112467307A CN 112467307 A CN112467307 A CN 112467307A CN 202011334663 A CN202011334663 A CN 202011334663A CN 112467307 A CN112467307 A CN 112467307A
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- ion battery
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- 239000000919 ceramic Substances 0.000 title claims abstract description 106
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005524 ceramic coating Methods 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 33
- 239000006255 coating slurry Substances 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 27
- 239000008199 coating composition Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- -1 polyethylene Polymers 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 230000010220 ion permeability Effects 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 description 12
- 239000011247 coating layer Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical group Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007719 peel strength test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a lithium ion battery ceramic diaphragm and a preparation method thereof, wherein the lithium ion battery ceramic diaphragm comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant. The preparation method comprises the following steps: dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the ceramic coating coated on the surface; the drying temperature is 50-90 ℃, and the drying time is 1-20 min. Compared with the prior art, the lithium ion battery ceramic diaphragm is light and thin and has excellent low thermal shrinkage rate and ion permeability.
Description
Technical Field
The application relates to the technical field of lithium ion battery ceramic diaphragms, in particular to a lithium ion battery ceramic diaphragm and a preparation method thereof.
Background
Separators are important components in lithium ion batteries to isolate the positive and negative electrodes of the battery from short circuits. On the other hand, the separator should have sufficient ion permeability to allow lithium ions to be smoothly transmitted between the positive and negative electrodes. With the continuous development of lithium ion battery technology, people also put higher demands on the performance of the diaphragm, which is mainly embodied in the following aspects:
1. the thermal performance of the diaphragm comprises the resistance of the diaphragm to thermal deformation under high-temperature conditions, the capability of closing a lithium ion transmission channel to prevent continuous temperature rise, and the capability of damaging the diaphragm structure due to melting, cracking, degradation and the like;
2. the permeability of the diaphragm mainly refers to the permeability of lithium ions transmitted between a positive electrode and a negative electrode through the diaphragm, and is generally characterized by Gurley air permeability;
3. the hygroscopicity of the diaphragm is required to be as low as possible so as to reduce the moisture residue of the diaphragm caused by moisture absorption in the processes of processing, storage, transportation and use;
4. the thickness of the diaphragm is required to be as thin as possible, so that the volume occupation of the diaphragm in the lithium ion battery is reduced, and the energy density of the lithium ion battery is improved as much as possible;
5. the stability of the electrolyte requires that the diaphragm is stable in shape and structure under the condition of being soaked in the electrolyte for a long time.
Usually, the material of the separator is polyethylene, polypropylene, or the like. The material has the advantages of good electrolyte stability, but low thermal deformation temperature and melting temperature, and is difficult to meet the requirements of lithium ion batteries, especially lithium ion batteries used as power sources (such as lithium ion batteries for electric automobiles).
At present, the main means for improving the heat resistance of the separator is to apply a heat-resistant coating layer on one or both sides of the separator, among which the most commonly used coating layer is a ceramic coating layer. The main components of the ceramic coating are ceramic powder and a binder, and other auxiliary agents are usually added. The ceramic coating and the polyethylene and polypropylene film (referred to as base film) as the base material jointly form the ceramic diaphragm. The preparation method of the ceramic diaphragm comprises the following steps: dispersing ceramic powder, adhesive and other auxiliary agents in pure water or an organic solvent to obtain ceramic slurry. Coating the slurry on one or two surfaces of the base film quantitatively by means of blade coating, roller coating and the like, and after drying, uniformly adhering the ceramic powder on the surface of the base film under the action of an adhesive to form a heat-resistant ceramic coating. The performance of the ceramic diaphragm, in addition to meeting the above general performance requirements of the lithium ion battery diaphragm, should also meet:
1. good bonding force should be provided between the ceramic coating and the base film and between the ceramic particles, and the defects of powder falling, coating falling and the like must not exist;
2. the composition of the ceramic coating should be as simple as possible and inert to the electrolyte, avoiding the introduction of substances into the cell that affect the performance of the cell;
3. when the ceramic coating slurry is prepared, water rather than an organic solvent is selected as a dispersing agent as much as possible so as to realize green environmental protection in the production preparation process;
4. the ceramic coating slurry should have good wettability to the base film so that the slurry can be uniformly spread and soaked on the surface of the base film. In general, the wettability of the water-based ceramic coating slurry to the base film is not good, and needs to be improved by adding a wetting agent or performing surface treatment on the base film;
5. the influence of the ceramic coating on the ion permeability of the separator should be as small as possible. The ion permeability of the separator will inevitably deteriorate due to the introduction of the ceramic coating, and the binder in the coating is generally a major factor affecting the ion permeability. The influence of the coating on ion permeability can be reduced to a certain extent by introducing the pore-forming agent into the coating, the commonly used pore-forming agent is a substance which is volatile or easy to decompose to generate gas, and in the drying process of the ceramic diaphragm preparation, the pore-forming agent is heated to volatilize or decompose, and tiny pores are left in the coating, so that a channel which is favorable for lithium ion transmission is established.
In recent years, a great deal of research is carried out on the modification technology of the ceramic diaphragm of the lithium ion battery. For example, chinese patent CN102437302A discloses a lithium ion battery separator prepared by using a ceramic coating modification technique, wherein the thermal shrinkage rate of the separator is 6% (ceramic powder is alumina) or 5% (ceramic powder is aluminum nitride) under the thermal shrinkage test conditions of 150 ℃ and 10 min. However, the thickness of the base film of the separator reached 20 μm, and the thickness of the coating layer also reached 5 μm. And the diaphragm was sandwiched between the metal plates when the heat shrinkage test was performed, the restraint of the weight of the metal plates limiting the heat shrinkage of the diaphragm to some extent. Chinese patent CN102569701A also discloses a lithium ion battery separator prepared by using a ceramic coating modification technology, which is characterized in that a polymer adhesive layer is added on the surface of a ceramic coating to bond the separator on the pole piece of the battery, and the thermal shrinkage rate of the separator is reduced by using the supporting force of the pole piece. The thermal shrinkage rate of the diaphragm is not more than 5% under the test conditions of 200 ℃ and 5 min. However, the patent does not specify the method of the heat shrinkage test, which has a great influence on the test results. In addition, whether the additionally introduced polymer adhesive layer has an influence on the ion permeability of the separator is questionable.
Therefore, there is an urgent need for a lithium ion battery ceramic separator and a preparation method thereof, and the lithium ion battery ceramic separator is light and thin and has excellent low thermal shrinkage and ion permeability, which has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the present application provides a lithium ion battery ceramic diaphragm and a preparation method thereof, wherein the lithium ion battery ceramic diaphragm is light and thin and has excellent low thermal shrinkage and ion permeability.
The technical scheme provided by the application is as follows:
the invention provides a lithium ion battery ceramic diaphragm which comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant.
Another technical scheme provided by the application is as follows:
the invention provides a preparation method of a lithium ion battery ceramic diaphragm, which comprises the following steps:
s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating; the drying temperature is 50-90 ℃, and the drying time is 1-20 min.
Further, in a preferred mode of the present invention, the drying temperature is preferably 60 to 70 ℃, and the drying time is preferably 1 to 5 min.
Further, in a preferred embodiment of the present invention, in the ceramic coating slurry, the mass fraction of the composition of the lithium ion battery ceramic separator coating is 38% to 42%.
Further, in a preferred aspect of the present invention, the material of the base film includes: polyethylene and polypropylene; the thickness of the base film is 5-12 mu m.
Further, in a preferred embodiment of the present invention, the thickness of the base film is 7 to 10 μm.
Further, in a preferred mode of the present invention, uniformly applying the ceramic coating slurry to the surface of the base film includes: the ceramic coating slurry is applied to one and/or both surfaces of the base film.
Further, in a preferred embodiment of the present invention, the thickness of the ceramic coating after drying is 1 to 3 μm.
Further, in a preferred embodiment of the present invention, the thickness of the ceramic coating after drying is 1.5 to 2 μm.
Further, in a preferred mode of the invention, the transverse and longitudinal thermal shrinkage rates of the lithium ion battery ceramic separator are less than or equal to 3%.
Further, in a preferred mode of the invention, the Gurley gas permeability increase value of the lithium ion battery ceramic membrane is less than or equal to 20 s.
Further, in a preferred mode of the invention, the peel strength of the ceramic coating on the surface of the lithium ion battery ceramic separator is greater than or equal to 100N/m.
The invention provides a technical scheme, compared with the prior art, the invention provides a lithium ion battery ceramic diaphragm, which comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant. The technical scheme of the invention; the invention also provides a preparation method of the lithium ion battery ceramic diaphragm, which comprises the following steps: s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating; the drying temperature is 50-90 ℃, and the drying time is 1-20 min. Compared with the prior art, the lithium ion battery ceramic diaphragm is light and thin, has excellent low thermal shrinkage and ion permeability, and is green and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a peel strength test curve of the lithium ion battery ceramic separator according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship that is indicative of but not limiting of the present application, merely to facilitate the description of the application and to simplify the description, and that it is not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the disclosure of the present application, which is to be read and understood by those skilled in the art, is not to be limited to the details of construction and arrangement of parts so defined, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
As shown in fig. 1, the present application provides a ceramic separator for a lithium ion battery, which comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant. The technical scheme of the invention; the invention also provides a preparation method of the lithium ion battery ceramic diaphragm, which comprises the following steps: s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating; the drying temperature is 50-90 ℃, and the drying time is 1-20 min.
The embodiment of the invention provides a lithium ion battery ceramic diaphragm which comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant. The technical scheme of the invention; the invention also provides a preparation method of the lithium ion battery ceramic diaphragm, which comprises the following steps: s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating; the drying temperature is 50-90 ℃, and the drying time is 1-20 min. Compared with the prior art, the lithium ion battery ceramic diaphragm is light and thin, has excellent low thermal shrinkage and ion permeability, and is green and environment-friendly.
Preparation of the lithium ion Battery ceramic separator example 1
Three (3) slurry preparation vessels were prepared, and 54g of pure water and 0.15g of a commercially available water-soluble dispersant were put therein. Fully stirring until the dispersing agent is completely dissolved. Then, 39g of boehmite powder ceramics was charged, and stirred and dispersed for 1 hour at a stirring speed of 1200 rpm. And then, reducing the rotating speed to 500rpm, respectively adding the adhesive, and dispersing for 30min to obtain ceramic coating slurry. And (3) coating the ceramic coating slurry on the surface of a polyethylene base film with the thickness of 9 microns by using a wire bar with the specification of 7 microns, and drying in an electrothermal blowing drying oven at the temperature of 60 ℃ for 5min to obtain the lithium ion battery ceramic diaphragm with the coating thickness of 2 microns.
Specifically, in the embodiment of the invention, the drying temperature is preferably 60-70 ℃, and the drying time is preferably 1-5 min.
Specifically, in the embodiment of the invention, the mass fraction of the composition of the lithium ion battery ceramic separator coating in the ceramic coating slurry is 38-42%.
Specifically, in an embodiment of the present invention, the material of the base film includes: polyethylene and polypropylene; the thickness of the base film is 5-12 mu m.
Specifically, in the embodiment of the invention, the thickness of the base film is 7-10 μm.
Specifically, in an embodiment of the present invention, uniformly applying the ceramic coating slurry to the surface of the base film includes: the ceramic coating slurry is applied to one and/or both surfaces of the base film.
Specifically, in the embodiment of the invention, the thickness of the ceramic coating after drying is 1-3 μm.
Specifically, in the embodiment of the invention, the thickness of the ceramic coating after drying is 1.5-2 μm.
Specifically, the step of testing the low thermal shrinkage rate of the lithium ion battery ceramic diaphragm comprises the following steps:
taking one lithium ion battery ceramic diaphragm with known transverse and longitudinal lengths, clamping the lithium ion battery ceramic diaphragm between two pieces of A4 printing paper, and horizontally placing the lithium ion battery ceramic diaphragm in an oven at the temperature of 150 ℃ for baking for 1 hour;
and measuring the transverse length and the longitudinal length of the baked lithium ion battery ceramic diaphragm, and calculating the low heat shrinkage rate.
Example 2 testing of the lithium ion Battery ceramic separator
Testing the thermal shrinkage rate: cutting one ceramic diaphragm with the transverse length and the longitudinal length of 10cm respectively, clamping between two pieces of A4 printing paper, and horizontally placing in an oven with the temperature of 150 ℃ for baking for 1 h. The transverse and longitudinal lengths of the baked ceramic separator were measured, and the heat shrinkage was calculated.
Gurley air permeability test: the time required for the polyethylene-based film, which is not coated with the ceramic coating, and the ceramic membrane to permeate 100cc of air, respectively, was measured using a Gurley air permeability tester, and the difference between them was the Gurley air permeability increase value of the ceramic membrane.
And (3) testing the peel strength: the test was carried out using an electronic universal tester.
The test results are shown in the following table.
Specifically, in the embodiment of the invention, the transverse and longitudinal thermal shrinkage rates of the lithium ion battery ceramic separator are less than or equal to 3%.
Specifically, in the embodiment of the invention, the Gurley gas permeability increase value of the lithium ion battery ceramic membrane is less than or equal to 20 s.
Specifically, in the embodiment of the invention, the peel strength of the ceramic coating on the surface of the lithium ion battery ceramic separator is greater than or equal to 100N/m.
From the above, the lithium ion battery ceramic diaphragm related to the embodiment of the invention specifically comprises the following components: a base film; a lithium ion battery ceramic separator coating composition; the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant. The technical scheme of the invention; the invention also provides a preparation method of the lithium ion battery ceramic diaphragm, which comprises the following steps: s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry; s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating; the drying temperature is 50-90 ℃, and the drying time is 1-20 min. Compared with the prior art, the lithium ion battery ceramic diaphragm is light and thin, has excellent low thermal shrinkage and ion permeability, and is green and environment-friendly.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A lithium ion battery ceramic separator is characterized by comprising the following components:
a base film; a lithium ion battery ceramic separator coating composition;
the lithium ion battery ceramic separator coating composition comprises: ceramic powder, adhesive and dispersant.
2. The method for preparing the ceramic separator of the lithium ion battery according to claim 1, comprising the following steps:
s101, dispersing the components of the lithium ion battery ceramic diaphragm coating in pure water to obtain ceramic coating slurry;
s102, uniformly coating the ceramic coating slurry on the surface of the base film, and heating and drying to obtain the lithium ion battery ceramic diaphragm with the surface coated with the ceramic coating;
the drying temperature is 50-90 ℃, and the drying time is 1-20 min.
3. The method for preparing the lithium ion battery ceramic separator according to claim 2, wherein the mass fraction of the composition of the lithium ion battery ceramic separator coating in the ceramic coating slurry is 38-42%.
4. The method for preparing the ceramic diaphragm of the lithium ion battery according to claim 2, wherein the base film is made of a material comprising: polyethylene and polypropylene; the thickness of the base film is 5-12 mu m.
5. The preparation method of the ceramic separator for the lithium ion battery according to claim 4, wherein the thickness of the base film is 7-10 μm.
6. The method for preparing the ceramic separator of the lithium ion battery according to claim 2, wherein uniformly coating the ceramic coating slurry on the surface of the base film comprises: the ceramic coating slurry is applied to one and/or both surfaces of the base film.
7. The preparation method of the lithium ion battery ceramic separator according to claim 2, wherein the thickness of the dried ceramic coating is 1-3 μm.
8. The method for preparing the lithium ion battery ceramic separator according to claim 2, wherein the transverse and longitudinal thermal shrinkage rates of the lithium ion battery ceramic separator are less than or equal to 3%.
9. The method of claim 2, wherein the Gurley gas permeability increase of the lithium ion battery ceramic separator is less than or equal to 20 s.
10. The method for preparing the lithium ion battery ceramic separator according to claim 2, wherein the peel strength of the ceramic coating on the surface of the lithium ion battery ceramic separator is greater than or equal to 100N/m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4175045A1 (en) | 2021-10-28 | 2023-05-03 | Jiangsu Horizon New Energy Tech Co., Ltd | Coated separator with high heat resistance and high peel strength and preparation method thereof |
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2020
- 2020-11-25 CN CN202011334663.9A patent/CN112467307A/en active Pending
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Application publication date: 20210309 |