CN205488313U - Compound diaphragm of PET heavy ion micropore for lithium cell - Google Patents
Compound diaphragm of PET heavy ion micropore for lithium cell Download PDFInfo
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- CN205488313U CN205488313U CN201620064738.9U CN201620064738U CN205488313U CN 205488313 U CN205488313 U CN 205488313U CN 201620064738 U CN201620064738 U CN 201620064738U CN 205488313 U CN205488313 U CN 205488313U
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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 utility model discloses a compound diaphragm of PET heavy ion micropore for lithium cell, including micropore PET film (1) and many cellular material layer (2), micropore PET film (1) is gone up to distribute has straight micropore (11) along the thickness direction is arranged, many cellular material layer (2) are coated micropore PET film (1) and are gone up the double -deck range upon range of netted microcellular structure of formation, the porosity of many cellular material layer (2) is 10%~90%, the aperture is less than 2 microns. The utility model discloses a many cellular material layer does not receive etching and have the microcellular structure that the lithium ion can freely move when the etching of micropore PET film formation, the micropore that has remedied on traditional micropore PET film easily takes place the defect in heavy hole and the defect of puncture of anti lithium dendrite and the puncture of pole piece granule, has improved unfamiliar whole electrolyte infiltration nature, and the straight mipor aperture design scope of micropore PET film more greatly, production efficiency is high.
Description
Technical field
This utility model relates to lithium battery diaphragm, is specifically related to a kind of lithium battery PET heavy ion microporous composite diaphragm.
Background technology
Chinese Patent Application No. be 201110071317.0 patent documentation disclose a kind of micropore PET film and production method thereof, the production method of this PET heavy ion microporous lithium battery diaphragm is with PET film as base material, with high energy heavy particle, PET film is carried out irradiation, the PET film through irradiation is dipped in the container filling acid solution or aqueous slkali and is etched the product micropore PET film that reaction acquisition is final.But, there is following defect in micropore PET film prepared by this technical scheme: (1) this micropore PET film has certain probability and there is the appearance of 2 or more than 2 micropore repeated holes, the appearance of repeated hole can cause the multiple in aperture to expand, and reduces puncture resistance and the insulating properties of barrier film；(2) the electrolyte wellability of this micropore PET film is the best；(3) aperture of this micropore PET film needs to control, below 2 microns, to need high density holes, reduce irradiation efficiency；(4) micropore of this micropore PET film is that micropore has lithium dendrite arm to be punctured to the risk of negative pole from positive pole；(5) single layer microporous film of this micropore PET film, owing to aperture is micropore, ion exchange paths is the shortest, reaction is faster, but positive/negative plate surface is made up of to micron-sized powdery granule nanometer, as the thinnest in barrier film and be straight hole, the granule of these positive and negative pole materials is easy in duct contact, causes micro-short circuit.
Utility model content
The technical problems to be solved in the utility model is to provide that a kind of microporous materials layer or not when microporous PE T film forming etches and have lithium ion can the microcellular structure of free migration, compensate for defect and the defect of anti-Li dendrite puncture of micropore generation repeated hole in micropore PET film, improve barrier film entirety electrolyte wellability, lithium battery PET heavy ion microporous composite diaphragm that the scope of design of the straight micropore size of micropore PET film is bigger, production efficiency is high and preparation method thereof.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of lithium battery PET heavy ion microporous composite diaphragm, including micropore PET film and microporous materials layer, straight micropore that through-thickness arrange is distributed in described micropore PET film, and described microporous materials layer coats formation twin stack reticulated macroporous structure in micropore PET film.
The porosity of described microporous materials layer is 10%～90%, aperture is less than 2 microns.
The thickness of described micropore PET film is 2 microns～50 microns.
nullThis utility model lithium battery PET heavy ion microporous composite diaphragm has an advantage that this utility model includes micropore PET film and microporous materials layer，Micropore that through-thickness arrange is distributed in micropore PET film，Microporous materials layer coats formation twin stack reticulated macroporous structure in micropore PET film，Microporous materials layer can keep stably not etched in the etching reaction aqueous slkali when the molding of micropore PET film，And microporous materials layer there is lithium ion can the microcellular structure of free migration，The twin stack micropore of twin stack reticulated macroporous structure compensate for the micropore in conventional microporous PET film and defect and the defect of anti-Li dendrite puncture of repeated hole easily occur，There is electrolyte wellability and the thermal stability of excellence simultaneously，The introducing of microporous materials layer，The straight micropore size making micropore PET film can do more，Thus lower well densities can realize the ionic transport passages requirement of high density holes，Improve production efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sectional structure schematic diagram of this utility model embodiment PET heavy ion microporous composite diaphragm.
Fig. 2 is the sectional structure schematic diagram of this utility model embodiment PET heavy ion microporous composite diaphragm semi-finished product.
Fig. 3 is the sectional structure schematic diagram after this utility model embodiment PET heavy ion microporous composite diaphragm semi-finished product irradiation.
Marginal data: 1, micropore PET film；11, straight micropore；2, microporous materials layer.
Detailed description of the invention
Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus protection domain of the present utility model is made apparent clear and definite defining.
As shown in Figure 1, the lithium battery PET heavy ion microporous composite diaphragm of the present embodiment includes micropore PET film 1 and microporous materials layer 2, straight micropore 11 that through-thickness arrange is distributed in described micropore PET film 1, and described microporous materials layer 2 coats formation twin stack reticulated macroporous structure in micropore PET film 1.
In the present embodiment, the porosity of microporous materials layer 2 is 10%～90%, aperture is less than 2 microns.
In the present embodiment; microporous materials layer 2 is the multi-cellular structure body obtained by the mixing cured molding of macromolecule resin and inorganic oxide particles, and macromolecule resin can use at least one in polyvinylidene fluoride, modified polyvinylidene fluoride, politef, modified Teflon as required；Inorganic oxide particles can use at least one in aluminium sesquioxide, titanium dioxide, silicon dioxide as required.
In the present embodiment, the grain diameter of inorganic oxide particles is less than 5 microns.
In the present embodiment, the thickness of micropore PET film 1 is 2 microns～50 microns.
The step of the preparation method of the present embodiment lithium battery PET heavy ion microporous composite diaphragm includes:
1) macromolecule resin, inorganic oxide particles, solvent are mixed to form colloid material；
2) colloid material being coated on PET film base material formation wet film layer, makes wet film layer form microporous materials layer 2 on PET film base material the PET film base material baking-curing molding with wet film layer, its structure is as shown in Figure 2；
3) high energy heavy particle is used to carry out irradiation the PET film base material with microporous materials layer 2, structure after irradiation is as shown in Figure 3, it is the position of straight micropore 11 after irradiation on PET film base material by the position of high energy heavy particle irradiation, uses aqueous slkali to be etched reaction and can form straight micropore 11；
4) the PET film base material with microporous materials layer 2 after irradiated is etched reaction by aqueous slkali, PET film base material is made to form the micropore PET film 1 that straight micropore 11 that through-thickness arrange is distributed, obtaining PET heavy ion microporous composite diaphragm finished product, its structure is as shown in Figure 1.Microporous materials layer 2 is loose and porous structure, and the micropore on microporous materials layer 2 spreads in microporous materials layer 2 the most mussily, and the structure of the straight micropore 11 of micropore PET film 1 through-thickness layout is completely different.
In the present embodiment, step 1) in the mass ratio of macromolecule resin can use 10%～50% as required, the mass ratio of inorganic oxide particles can use 5%～50% as required, and the mass ratio of solvent can use 50%～90% as required.
In the present embodiment, macromolecule resin can use at least one in polyvinylidene fluoride, modified polyvinylidene fluoride, politef, modified Teflon as required；Inorganic oxide particles can use at least one in aluminium sesquioxide, titanium dioxide, silicon dioxide as required；Solvent can use at least one in dimethylformamide (DMF), butanone (MEK) as required.
In the present embodiment, step 2) in by during with the PET film base material baking-curing molding of wet film layer, baking temperature is 40 DEG C～120 DEG C, and also includes the step being immersed in coagulating bath by the PET film base material with wet film layer before baking-curing molding, and coagulating bath is made up of water and ethanol.
In the present embodiment, in coagulating bath, the mass ratio of water can use 60%～100% as required, the mass ratio of ethanol can use 0%～40% as required.
In the present embodiment, step 3) in when carrying out irradiation, irradiation power is 2000～10000 kilowatts, and exposure time is 0.5～200 second；Step 4) in when being etched reaction by aqueous slkali, aqueous slkali is 10～the sodium hydroxide solution of 50% or potassium hydroxide solution, and the time being etched reaction is 1～30 minute.
The foregoing is only preferred implementation of the present utility model, protection domain of the present utility model is not limited in above-mentioned embodiment, and every technical scheme belonging to this utility model principle belongs to protection domain of the present utility model.For a person skilled in the art, the some improvements and modifications carried out on the premise of without departing from principle of the present utility model, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (3)
1. a lithium battery PET heavy ion microporous composite diaphragm, it is characterized in that: include micropore PET film (1) and microporous materials layer (2), straight micropore (11) that through-thickness arrange is distributed on described micropore PET film (1), and described microporous materials layer (2) coats micropore PET film (1) upper formation twin stack reticulated macroporous structure.
Lithium battery PET heavy ion microporous composite diaphragm the most according to claim 1: it is characterized in that, the porosity of described microporous materials layer (2) is 10%～90%, aperture is less than 2 microns.
Lithium battery PET heavy ion microporous composite diaphragm the most according to claim 2, it is characterised in that: the thickness of described micropore PET film (1) is 2 microns～50 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620064738.9U CN205488313U (en) | 2016-01-22 | 2016-01-22 | Compound diaphragm of PET heavy ion micropore for lithium cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620064738.9U CN205488313U (en) | 2016-01-22 | 2016-01-22 | Compound diaphragm of PET heavy ion micropore for lithium cell |
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| CN205488313U true CN205488313U (en) | 2016-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514329A (en) * | 2016-01-22 | 2016-04-20 | 中山国安火炬科技发展有限公司 | PET heavy-ion microporous composite membrane for lithium battery and preparation method thereof |
| CN111816538A (en) * | 2020-07-17 | 2020-10-23 | 兰州大学 | Transmission electron microscope micro-grid based on heavy ion irradiation and preparation method |
| CN113629353A (en) * | 2021-08-05 | 2021-11-09 | 中国科学院近代物理研究所 | PET (polyethylene terephthalate) basic weight ion track composite diaphragm for lithium ion battery and preparation method of PET basic weight ion track composite diaphragm |
-
2016
- 2016-01-22 CN CN201620064738.9U patent/CN205488313U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514329A (en) * | 2016-01-22 | 2016-04-20 | 中山国安火炬科技发展有限公司 | PET heavy-ion microporous composite membrane for lithium battery and preparation method thereof |
| CN111816538A (en) * | 2020-07-17 | 2020-10-23 | 兰州大学 | Transmission electron microscope micro-grid based on heavy ion irradiation and preparation method |
| CN111816538B (en) * | 2020-07-17 | 2022-03-25 | 兰州大学 | Transmission electron microscope micro-grid based on heavy ion irradiation and preparation method |
| CN113629353A (en) * | 2021-08-05 | 2021-11-09 | 中国科学院近代物理研究所 | PET (polyethylene terephthalate) basic weight ion track composite diaphragm for lithium ion battery and preparation method of PET basic weight ion track composite diaphragm |
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