CN108695473A - Lithium ion battery separator and preparation method thereof - Google Patents
Lithium ion battery separator and preparation method thereof Download PDFInfo
- Publication number
- CN108695473A CN108695473A CN201710237210.6A CN201710237210A CN108695473A CN 108695473 A CN108695473 A CN 108695473A CN 201710237210 A CN201710237210 A CN 201710237210A CN 108695473 A CN108695473 A CN 108695473A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- battery separator
- film
- coating composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H01M50/403—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
-
- 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
A kind of lithium ion battery separator, including the ceramic layer of film layer and the side surface at least formed on the film layer, the ceramic layer distribute as net shape in the film surface.Further relate to a kind of preparation method of lithium ion battery separator.
Description
Technical field
The present invention relates to lithium ion battery separator preparation fields.
Background technology
Since lithium ion battery commercialization the 1990s, since it is high with energy density, operating voltage is high, nothing
Memory effect and the power supply for being widely used as various mobile devices the features such as having extended cycle life.With the big rule of lithium ion battery
The application of mould, safety problem are also increasingly prominent.
In lithium ion battery, the main function of diaphragm is that the positive and negative electrode of battery is made to separate, and prevents the two poles of the earth from contacting
And it is short-circuit, it is one of the interior layer assembly of key.The performance of diaphragm determines the interfacial structure of battery, internal resistance etc., directly affects
The characteristics such as capacity, cycle and the security performance of battery, the diaphragm haveing excellent performance have the comprehensive performance for improving lithium ion battery
There is important role.
Currently, the diaphragm that lithium ion battery uses is generally Polyolefin-based porous film, due to this Polyolefin-based porous film
Fusing point be less than 200 DEG C, therefore they there are following defects:When battery temperature is increased because of internal or external factor, it is this every
Film can shrink or melt so that the volume change of diaphragm.The contraction or melting of diaphragm can cause straight between anode and cathode again
Contact, leads to battery short circuit, so as to cause the generation of the contingencies such as cells burst explosion.Therefore, in order to ensure battery
It is safe to use, it is necessary to which that a kind of diaphragm that will not cause thermal contraction and heat fusing because of battery high-temperature is provided.
Invention content
Therefore, it is necessary to provide a kind of lithium ion battery separator and preparation method, so as to get diaphragm have it is preferable strong
Degree is to be not easy shrinkage.
A kind of preparation method of lithium ion battery separator, including step:Film layer is provided;Coating composition, the painting are provided
Layer composition includes adhesive and ceramic particle;The coating composition is coated at least one surface of the film layer, wherein
The coating composition distributes as net shape;And drying makes the coating composition be cured as ceramic layer, obtains the lithium ion
Battery diaphragm.
A kind of lithium ion battery separator, including the ceramic layer of film layer and the side surface at least formed on the film layer, institute
Ceramic layer is stated to distribute as net shape in the film surface.
Compared with the existing technology, lithium ion battery separator of the present invention and preparation method, because ceramic layer is set as latticed, by force
Degree is more preferable, to be not easy shrinkage.
Description of the drawings
Fig. 1 is the schematic top plan view of the battery diaphragm of the technical program embodiment.
Fig. 2 is the schematic cross-sectional view of the battery diaphragm of the technical program embodiment.
Fig. 3 is the schematic top plan view of the battery diaphragm of another embodiment of the technical program.
Fig. 4 is the schematic cross-sectional view of the battery diaphragm of another embodiment of the technical program.
Main element symbol description
Lithium ion battery separator 1,1a
Film layer 10,10a
Ceramic layer 20,20a
The present invention will be further illustrated in following specific implementation mode.
Specific implementation mode
The technical program embodiment provides a kind of preparation method of lithium ion battery separator, including:
(1) film layer is provided
Preferably, the film layer is polyethylene film, polypropylene screen or polypropylene, polyethylene/polypropylene composite film, polyester
Film, cellulose membrane, polyimide film, PA membrane, spandex or aramid fiber film etc..
Preferably, the thickness of the film layer be 40 microns (μm) below.
Such as it is used as power battery, it is preferable that the thickness of the film layer is 15 μm to 25 μm.
Such as it is used as the battery of consumer electrical product, it is preferable that the thickness of the film layer is 7 μm or less.
(2) coating composition is provided
Preferably, the coating composition includes mixed adhesive and ceramic particle.
Preferably, further include solvent in the coating composition.
Preferably, the ingredient of described adhesive be polyvinylidene fluoride, polyacrylonitrile, polyethylene glycol oxide, polypropylene oxide,
One or more of polymethyl methacrylate, polyvinyl acetate, Kynoar-hexafluoropropylene copolymer.
It is highly preferred that the ingredient of described adhesive is polyvinylidene fluoride or Kynoar-hexafluoropropylene copolymer.
Preferably, mass percentage of the described adhesive in the coating composition is 0.1%-5%.
Preferably, the ceramic particle be silica, alundum (Al2O3), zirconium dioxide, titanium dioxide, magnesium dioxide,
The combination of one or more of barium sulfate, calcium carbonate, magnesium hydroxide.
Preferably, mass percentage of the ceramic particle in the coating composition is 0.1%-5%.
(3) coating composition is coated
- 2 are please referred to Fig.1, by the coating composition at least one surface of the film layer 10, cures the painting
Layer composition on 10 surface of the film layer so that form ceramic layer 20;The ceramic layer 20 is on 10 surface of the film layer in latticed
Distribution.Wherein, the grid is the lines composition of intersection, such as can be the grid for the lines composition for tilting intersection, can also
For the grid of the lines composition to intersect vertically.
Wherein it is possible to by the coating composition on a surface of the film layer, it can also be by the coating group
Close opposite two surfaces that object is coated in the film layer.
Preferably, the ceramic layer 20 is is made of evenly arranged lines, it is highly preferred that the lines include two groups,
Lines in every group are parallel and spacing is identical, two groups of lines intersections.
Preferably, by modes such as coating, printing or sprayings by the coating composition on the surface of the film layer.
Preferably, the coating thickness of the coating composition is 8 μm or less.
It is highly preferred that the coating thickness of the coating composition is 0.5 μm to 2 μm.
In other embodiments, Fig. 3-4 is please referred to, it is in that array is arranged that the grid of the ceramic layer 20, which can also be multiple,
The blocky of cloth.Preferably, the blocky is square;It is highly preferred that the blocky is uniformly arranged, such as respectively
Blocky size is identical, spacing is also identical.
(4) dry
It is dry that the ceramic layer 20 is made to cure and be bonded in the film layer 10, to obtain lithium ion battery separator 1.
Referring to Fig. 1 to Fig. 2, another embodiment of the technical program also provides a kind of lithium ion battery separator 1, described
Lithium ion battery separator 1 includes the ceramic layer 20 of film layer 10 and the side surface at least formed on the film layer 10.The ceramics
Layer 20 distributes as net shape on 10 surface of the film layer.
Wherein, the grid is the lines composition of intersection, for example, can be the grid for the lines composition for tilting intersection,
It can be the grid of the lines composition to intersect vertically.
Wherein it is possible to by the coating composition on a surface of the film layer, it can also be by the coating group
Close opposite two surfaces that object is coated in the film layer.
Wherein, the ceramic layer 20 is formed by curing by a coating composition.
Preferably, the film layer is polyethylene film, polypropylene screen or polypropylene, polyethylene/polypropylene composite film, polyester
Film, cellulose membrane, polyimide film, PA membrane, spandex or aramid fiber film etc..
Preferably, the thickness of the film layer is 40 μm or less.
Such as it is used as power battery, it is preferable that the thickness of the film layer is 15 μm to 25 μm.
Such as it is used as the battery of consumer electrical product, it is preferable that the thickness of the film layer is 7 μm or less.
Preferably, the coating composition includes mixed adhesive and ceramic particle.
Preferably, further include solvent in the coating composition.
Preferably, the ingredient of described adhesive be polyvinylidene fluoride, polyacrylonitrile, polyethylene glycol oxide, polypropylene oxide,
One or more of polymethyl methacrylate, polyvinyl acetate, Kynoar-hexafluoropropylene copolymer.
It is highly preferred that the ingredient of described adhesive is polyvinylidene fluoride or Kynoar-hexafluoropropylene copolymer.
Preferably, mass percentage of the described adhesive in the coating composition is 0.1%-5%.
Preferably, the ceramic particle be silica, alundum (Al2O3), zirconium dioxide, titanium dioxide, magnesium dioxide,
The combination of one or more of barium sulfate, calcium carbonate, magnesium hydroxide.
Preferably, mass percentage of the ceramic particle in the coating composition is 0.1%-5%.
Preferably, the ceramic layer 20 is in evenly arranged distributed in grid on 10 surface of the film layer.
Preferably, the coating thickness of the coating composition is 8 μm or less.
It is highly preferred that the coating thickness of the coating composition is 0.5 μm to 2 μm.
In other embodiments, referring to Fig. 3-4, it is in battle array that the grid of the ceramic layer 20, which can also be multiple,
Arrange the blocky of arrangement.The preferably described blocky is square;It is highly preferred that the blocky is uniformly arranged, example
As each blocky size is identical, spacing is also identical.
The isolation film and preparation method with ceramic material of the present invention makes battery core hinder because the content of ceramic particle is arranged
It is anti-smaller to play the role of increasing battery core safety;And isolation film well not will produce shrinkage with positive/negative plate attachment;Also,
Because ceramic layer is set as latticed, intensity is more preferable, to isolation film film layer thickness can also design more in the prior art
Isolation film it is thinner.
Lithium ion battery separator prepared by the present invention can be used for preparing lithium ion battery.
Embodiment 1
The present embodiment provides a kind of preparation methods of lithium ion battery separator, including:
(1) film layer is provided, wherein the material of the film layer is polyethylene, and the thickness of the film layer is 5 μm or so.
(2) coating composition is provided, the coating composition includes adhesive and ceramic particle, wherein described adhesive
Ingredient be polyvinylidene fluoride, the ingredient of the ceramic particle is silica, calcium carbonate and magnesium hydroxide, described adhesive
Mass percentage in the coating composition is 1% or so, matter of the ceramic particle in the coating composition
It is 1% or so to measure percentage composition.
(3) coating composition is coated, wherein by the coating composition in opposite two tables of the film layer
Face, and the coating composition is made to distribute as net shape, the coating thickness of the coating composition is slightly over 1 μm.
(4) dry, to be respectively formed latticed ceramic layer, the thickness of the ceramic layer with respect to two surfaces in the film layer
It it is 1 μm or so, to obtain a lithium ion battery separator.
Embodiment 2
The present embodiment provides a kind of lithium ion battery separators, including:The material of film layer, the film layer is polyethylene, described
The thickness of film layer is 5 μm or so;Ceramic layer, is formed in opposite two surfaces of the film layer, and the ceramic layer is in embodiment 1
Coating composition be formed by curing, the thickness of the ceramic layer is 1 μm or so, and the ceramic layer is in latticed setting.
Test obtains, and the lithium ion battery separator that above-described embodiment 1,2 obtains is integrally relatively thin (about 7 μm or so), and positive and negative
The level of adhesion intensity of pole plate is preferable, and to keep the whole enhancing battery core intensity of battery core higher, and it is smaller to measure battery core impedance, has
Conducive to ionic conduction.
It is understood that for those of ordinary skill in the art, can be conceived with the technique according to the invention and be done
Go out various other corresponding changes and deformation, and all these changes and deformation should all belong to the protection model of the claims in the present invention
It encloses.
Claims (20)
1. a kind of preparation method of lithium ion battery separator, including step:
Film layer is provided;
Coating composition is provided, the coating composition includes adhesive and ceramic particle;
The coating composition is coated at least one surface of the film layer, wherein the coating composition is in latticed point
Cloth;And
Drying makes the coating composition be cured as ceramic layer, obtains the lithium ion battery separator.
2. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the film layer is polyethylene
Film, polypropylene screen, polypropylene, polyethylene/polypropylene composite film, polyester film, cellulose membrane, polyimide film, PA membrane, ammonia
Synthetic fibre or aramid fiber film.
3. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the thickness of the film layer is 7
Micron is hereinafter, the coating thickness of the coating composition is 0.5 micron to 2 microns.
4. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the ingredient of described adhesive is
Polyvinylidene fluoride, polyethylene glycol oxide, polypropylene oxide, polymethyl methacrylate, polyvinyl acetate, gathers polyacrylonitrile
One or more of vinylidene fluoride-hexafluoropropylene copolymer.
5. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that described adhesive is in the painting
Mass percentage in layer composition is 0.1%-5%.
6. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the ceramic particle is dioxy
One kind or several in SiClx, alundum (Al2O3), zirconium dioxide, titanium dioxide, magnesium dioxide, barium sulfate, calcium carbonate, magnesium hydroxide
The combination of kind.
7. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the ceramic particle is described
Mass percentage in coating composition is 0.1%-5%.
8. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the grid is by a plurality of intersection
Lines composition.
9. the preparation method of lithium ion battery separator as described in claim 1, which is characterized in that the grid is by multiple in battle array
The blocky composition of row arrangement.
10. a kind of lithium ion battery separator, including the pottery of an at least film layer and the side surface at least formed on a film layer
Enamel coating, the ceramic layer distribute as net shape in the film surface.
11. lithium ion battery separator as claimed in claim 10, which is characterized in that the ceramic layer is consolidated by a coating composition
Change and is formed.
12. lithium ion battery separator as claimed in claim 11, which is characterized in that the coating composition include adhesive and
Ceramic particle.
13. lithium ion battery separator as claimed in claim 12, which is characterized in that the ingredient of described adhesive is to gather inclined difluoro
Ethylene, polyacrylonitrile, polyethylene glycol oxide, polypropylene oxide, polymethyl methacrylate, polyvinyl acetate, Kynoar-
One or more of hexafluoropropylene copolymer.
14. lithium ion battery separator as claimed in claim 12, which is characterized in that the ceramic particle is silica, three
The group of one or more of Al 2 O, zirconium dioxide, titanium dioxide, magnesium dioxide, barium sulfate, calcium carbonate, magnesium hydroxide
It closes.
15. lithium ion battery separator as claimed in claim 12, which is characterized in that described adhesive is in the coating composition
In mass percentage be 0.1%-5%, mass percentage of the ceramic particle in the coating composition be
0.1%-5%.
16. lithium ion battery separator as claimed in claim 10, which is characterized in that the film layer is polyethylene film, polypropylene
Film, polypropylene, polyethylene/polypropylene composite film, polyester film, cellulose membrane, polyimide film, PA membrane, spandex or aramid fiber
Film.
17. lithium ion battery separator as claimed in claim 10, which is characterized in that the thickness of the film layer is for 7 μm hereinafter, institute
The thickness for stating ceramic layer is 0.5 micron to 1.5 microns.
18. lithium ion battery separator as claimed in claim 10, which is characterized in that the grid by a plurality of intersection lines group
At.
19. lithium ion battery separator as claimed in claim 10, which is characterized in that the grid is arranged in array by multiple
Blocky forms.
20. lithium ion battery separator as claimed in claim 10, which is characterized in that the lithium ion battery separator includes an institute
It states film layer and is respectively formed in the ceramic layer of the film layer opposite sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710237210.6A CN108695473A (en) | 2017-04-12 | 2017-04-12 | Lithium ion battery separator and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710237210.6A CN108695473A (en) | 2017-04-12 | 2017-04-12 | Lithium ion battery separator and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108695473A true CN108695473A (en) | 2018-10-23 |
Family
ID=63843975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710237210.6A Pending CN108695473A (en) | 2017-04-12 | 2017-04-12 | Lithium ion battery separator and preparation method thereof |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110600661A (en) * | 2019-08-19 | 2019-12-20 | 安徽理工大学 | Composite diaphragm with netted coating |
| CN110635091A (en) * | 2019-08-19 | 2019-12-31 | 安徽理工大学 | Lithium battery composite diaphragm and preparation method thereof |
| WO2021244410A1 (en) * | 2020-06-02 | 2021-12-09 | 孚能科技(镇江)有限公司 | Soft-pack lithium ion battery cell and preparation method therefor |
| EP4057406A1 (en) * | 2021-03-09 | 2022-09-14 | Prime Planet Energy & Solutions, Inc. | Secondary battery |
-
2017
- 2017-04-12 CN CN201710237210.6A patent/CN108695473A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110600661A (en) * | 2019-08-19 | 2019-12-20 | 安徽理工大学 | Composite diaphragm with netted coating |
| CN110635091A (en) * | 2019-08-19 | 2019-12-31 | 安徽理工大学 | Lithium battery composite diaphragm and preparation method thereof |
| WO2021244410A1 (en) * | 2020-06-02 | 2021-12-09 | 孚能科技(镇江)有限公司 | Soft-pack lithium ion battery cell and preparation method therefor |
| EP4057406A1 (en) * | 2021-03-09 | 2022-09-14 | Prime Planet Energy & Solutions, Inc. | Secondary battery |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181023 |