CN108305978A - A kind of lithium ion battery composite separation membrane and preparation method thereof - Google Patents
A kind of lithium ion battery composite separation membrane and preparation method thereof Download PDFInfo
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- CN108305978A CN108305978A CN201810019497.XA CN201810019497A CN108305978A CN 108305978 A CN108305978 A CN 108305978A CN 201810019497 A CN201810019497 A CN 201810019497A CN 108305978 A CN108305978 A CN 108305978A
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- 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
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- 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
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- 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
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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
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Abstract
This application discloses a kind of lithium ion battery composite separation membranes and preparation method thereof.The lithium ion battery composite separation membrane of the application includes the dry method simple tension diaphragm of at least two layers parallel stacking, also, in the simple tension diaphragm of adjacent two layers, and one layer is the directions MD, and another layer is the directions TD, and the directions MD and the directions TD are mutually perpendicular to.The composite diaphragm of the application, it is creative by one layer be the directions MD, another layer be the directions TD dry method simple tension diaphragm be combined with each other, make its mutual supplement with each other's advantages, so that composite diaphragm has the advantages that biaxial tensile strength is high, battery full-automation high-speed winding can be better conformed to, is not easy to tear.The composite diaphragm of the application is compound due to the dry method simple tension diaphragm of two layers of different directions, make it have unique pore structure such as special aperture, porosity and tortuosity, destruction of the inorganic particle to diaphragm during battery winding is avoided, a kind of composite diaphragm of new good combination property is provided for lithium ion battery.
Description
Technical field
This application involves lithium ion battery separator fields, more particularly to a kind of lithium ion battery composite separation membrane and its preparation
Method.
Background technology
High-energy density is the main means that continual mileage improves, and the ternary battery for possessing high-energy density compares ferric phosphate
Lithium battery is with the obvious advantage.Lithium ion battery separator is a kind of perforated membrane, and lithium ion battery separator is main in lithium ion battery
Effect is isolation battery plus-negative plate, prevents internal short-circuit of battery；The channel of migration of the lithium ion in charge and discharge process is provided, is permitted
Perhaps lithium ion passes through；Reduce the side effect unfavorable to battery efficiency.Commercialization is mainly wrapped suitable for the diaphragm of ternary battery at present
Include dry method simple tension diaphragm, wet method biaxial tension diaphragm.Referring to patent US5480745, JP2004323820
The preparation process of wet method biaxial tension diaphragm is related to mixing liquid hydrocarbon or some small-molecule substances with vistanex
It closes, after heating melting, forms uniform mixture, then cooling is separated, and suppresses to obtain diaphragm, then diaphragm is heated to connecing
Nearly melting temperature, carrying out biaxial tension makes molecular chain orientation, last held for some time be eluted with volatile substances remaining molten
The microporous membrane material being mutually communicated is prepared in agent.General wet method stretch processes have more excellent biaxial tensile strength,
It is more suitable for ternary battery, but due to needing solvent extraction, there is insurmountable environmental issue so far, cause European countries' mesh
The manufacturer of preceding mainstream has abandoned wet processing production, also rare correlative study report.
The preparation process of dry method simple tension diaphragm is related to the method by producing hard elastic fibre, prepares low-crystallinity
Highly oriented polypropylene or polyethylene film, then high annealing obtains the oriented film of high-crystallinity, and this film is first in low temperature
Under carry out stretch form microdefect, then so that defect is pulled open at high temperature, formed micropore.General dry-stretch process is not required to be plasticized
Agent and extraction step have the feature of environmental protection.Dry method simple tension membrane pore size is uniform, and thermal stability is more preferable, and still, dry method is unidirectionally drawn
The directions the TD intensity for stretching diaphragm is insufficient, there are problems that battery winding is easily torn.How the TD side of dry method simple tension diaphragm is solved
It is the important problem for promoting dry method simple tension diaphragm comprehensive performance to intensity deficiency.
Invention content
The purpose of the application is to provide a kind of lithium ion battery composite separation membrane of new construction and preparation method thereof.
To achieve the goals above, the application uses following technical scheme：
The one side of the application discloses a kind of lithium ion battery composite separation membrane, includes the dry method of at least two layers parallel stacking
Simple tension diaphragm, also, in the simple tension diaphragm of adjacent two layers, one layer is the directions MD, and another layer is the directions TD, the directions MD
It is mutually perpendicular to the directions TD.
It should be noted that the dry method list by the dry method simple tension diaphragm in the directions MD and the directions TD of the application creativeness
It is combined with each other to tensile membrane, forms the lithium ion battery composite separation membrane of two or more layers；On the one hand so that the lithium of the application
Ion battery composite diaphragm has the characteristics that the thermal stability of film by dry method is good, will not lead to diaphragm because battery overheats in battery
Contraction causes battery short circuit；On the other hand, the dry method simple tension membrane layer in the directions MD has ensured that composite diaphragm has the directions MD
Modulus is high, can preferably adapt to the full-automatic high-speed winding of battery, and the directions TD dry method simple tension membrane layer ensures
Composite diaphragm shrinks small in the directions TD so that the directions the lithium ion battery composite separation membrane TD tensile strength higher of the application, diaphragm
It is not easy to tear.The lithium ion battery composite separation membrane of the application, the creative dry method simple tension diaphragm by both direction are compound
Together, the dry method simple tension diaphragm in the directions MD and the dry method simple tension diaphragm in the directions TD are realized, the two has complementary advantages,
So that lithium ion battery composite separation membrane has the advantages that biaxial tensile strength is high, also, the dry method simple tension of both direction every
The diaphragm that film is compounded to form has unique pore structure such as special aperture, porosity and tortuosity, can be to avoid battery winding mistake
Destruction of the inorganic particle to diaphragm in journey plays the effect that 1+1 is more than 2.The lithium ion battery composite separation membrane of the application, not
While losing dry method simple tension diaphragm inherent characteristic, the isotropism of composite diaphragm is realized.
It should also be noted that, in the application, the directions MD and the directions TD are mutually perpendicular to refer to lithium ion battery composite separation membrane
When horizontal positioned, the directions MD and the directions TD are orthogonal in the projection of horizontal plane.
Preferably, the thickness of the composite diaphragm of the application is 40 microns or thickness below.
It is furthermore preferred that the thickness of composite diaphragm is 30 microns or thickness below.
It is furthermore preferred that the thickness of composite diaphragm is 20 microns or thickness below.
Preferably, the porosity of composite diaphragm is between 30-70%.
It is furthermore preferred that the porosity of the composite diaphragm is between 40-60%.
It is furthermore preferred that the porosity of the composite diaphragm is between 42-55%.
The preparation method of the lithium ion battery composite separation membrane for disclosing the application on one side again of the application, including following step
Suddenly,
It unreels：The dry method simple tension diaphragms of volume two are unreeled in membrane unwinding mechanism respectively；Wherein, the dry method of volume two are unidirectional
The parameter attribute of tensile membrane may be the same or different, specifically, depending on production technology or product demand,
This is not limited；
It is compound：Wherein a roll of dry method simple tension diaphragm is rotated by 90 ° so that a roll is the directions MD, and another volume is the side TD
To, and the directions MD and the directions TD are mutually perpendicular to, and are stacked in order, after cutting into identical size, in the case where applying pressure
It is compound to carry out hot-rolling pressure；
Winding：Compound diaphragm is wound on rolling-up mechanism；
Annealing：The composite diaphragm of winding is put into baking oven and is made annealing treatment to discharge stress, to which the lithium be made
Ion battery composite diaphragm.
Preferably, it is 20~150 DEG C that hot-rolling, which presses compound temperature, preferably 30~100 DEG C, more preferably 50~80 DEG C.
Preferably, it is 5-80psi, preferably 10-60psi, more preferably 20-50psi that hot-rolling, which presses compound pressure,；
Preferably, hot-rolling press compound speed be 20~100 ms/min, preferably 30~80 ms/min, more preferably
45~60 ms/min.
Preferably, the temperature of annealing is 20~100 DEG C, preferably 30~80 DEG C, more preferably 50~70 DEG C.
Preferably, the time of annealing is 0~10 hour, preferably 2~6 hours, more preferably 2~4 hours.
It should be noted that it is specifically compound using hot-rolling pressure in a kind of realization method of the application, each layer is compound
Together；It is appreciated that the composite diaphragm of the application, preparation method is not limited to hot-rolling and presses compound, other composite squares
Formula, such as adhesives are compound, ULTRASONIC COMPLEX, infrared compound etc., are same as can be used for the application, specific complex method root
Depending on working condition or product demand, do not limit herein.
Due to using the technology described above, the advantageous effect of the application is：
The lithium ion battery composite separation membrane of the application, creative by one layer is the directions MD, and another layer is the dry of the directions TD
Method simple tension diaphragm is combined with each other, and makes its mutual supplement with each other's advantages so that lithium ion battery composite separation membrane has biaxial tensile strength
High advantage, can preferably adapt to the full-automatic high-speed winding of battery, and be not easy to tear.The lithium ion battery of the application is multiple
Diaphragm is closed since the dry method simple tension diaphragm of two layers of different directions is compound, makes it have special aperture, porosity and complications
Unique pore structure such as degree, avoids destruction of the inorganic particle to diaphragm during battery winding, one kind is provided for lithium ion battery
The composite diaphragm of new good combination property, meanwhile, also a kind of new scheme and plan are provided for the research of lithium ion battery separator
Slightly.
Description of the drawings
Fig. 1 is the one of which structural schematic diagram of composite diaphragm in the embodiment of the present application；
Fig. 2 is another structural schematic diagram of composite diaphragm in the embodiment of the present application；
Fig. 3 is another structural schematic diagram of composite diaphragm in the embodiment of the present application.
Specific implementation mode
The existing technique of dry method simple tension diaphragm and diaphragm, still, in existing production or research report, based on each
Kind reason, there is no what the dry method simple tension diaphragm of the dry method simple tension diaphragm in the directions MD and the directions TD was combined with each other
Research report or product.The application has found during carrying out long-term production practices and research to battery diaphragm, by the side MD
To dry method simple tension diaphragm and the dry method simple tension diaphragm in the directions TD composite diaphragm is made, can realize two kinds of not Tongfangs
Mutual supplement with each other's advantages to diaphragm solves diaphragm inherent shortcoming caused by respective technique self reason, plays the effect that 1+1 is more than 2.
Also, the application, which further has developed, unidirectionally draws the dry method of the dry method simple tension diaphragm in the directions MD and the directions TD
The preparation method that diaphragm is combined with each other is stretched, the preparation method of the application is passed through so that the diaphragm of two kinds of different directions can have
Being combined with each other for effect, becomes the entirety of combination, so that each layer can have complementary advantages in prepared composite diaphragm
Play the effect that 1+1 is more than 2.The preparation method of the application provide one kind have both the feature of environmental protection and biaxial tensile strength it is good every
Film production process, prepared composite diaphragm have good comprehensive biaxial tensile strength height, thermal stability, uniform pore diameter, safety
The advantages that property is high, especially suitable for ternary material in lithium battery.
The application is described in further detail below by specific embodiments and the drawings.Following embodiment is only to the application
It is further described, should not be construed as the limitation to the application.
Embodiment one
The dry method simple tension diaphragm that this example uses is 12 μm of Shenzhen Zhong Xing innovative materials Technology Co., Ltd. production
Microporous polypropylene membrane.The dry method simple tension diaphragms of volume two are unreeled in membrane unwinding mechanism respectively, it will wherein a roll of dry method list
It is rotated by 90 ° to tensile membrane so that a roll is the directions MD (being indicated with A), and another volume is the directions TD (being indicated with B), and the side MD
It is mutually perpendicular to the directions TD, is stacked by the sequence of A-B, after cutting into identical size, it is compound to carry out hot-rolling pressure.Wherein, hot-rolling
It is 60 DEG C, pressure 30psi to press compound temperature, and recombination velocity is 50 ms/min.Compound diaphragm is received on rolling-up mechanism
Volume.Then, the composite diaphragm of winding is put into baking oven and is made annealing treatment to discharge stress, the temperature of baking oven annealing is
60 DEG C, annealing time is 3 hours.
The dry method in the final dry method simple tension diaphragm being made with the directions first layer MD and the directions second layer TD is unidirectionally drawn
Stretch two layers of composite diaphragm of diaphragm, i.e. AB structures.The thickness of the composite diaphragm is 24 microns, porosity 40%.
Embodiment two
The dry method simple tension diaphragm that this example uses is 12 μm of Shenzhen Zhong Xing innovative materials Technology Co., Ltd. production
Microporous polypropylene membrane.The dry method simple tension diaphragms of volume two are unreeled in membrane unwinding mechanism respectively, it will wherein a roll of dry method list
It is rotated by 90 ° to tensile membrane so that a roll is the directions MD (being indicated with A), and another volume is the directions TD (being indicated with B), and the side MD
It is mutually perpendicular to the directions TD, is stacked together according to the sequence of A-B-A, after cutting into identical size, it is compound to carry out hot-rolling pressure.Its
In, it is 60 DEG C, pressure 30psi that hot-rolling, which presses compound temperature, and recombination velocity is 50 ms/min.Compound diaphragm is being wound
It is wound in mechanism.Then, the composite diaphragm of winding is put into baking oven and is made annealing treatment to discharge stress, baking oven annealing
Temperature be 60 DEG C, annealing time be 3 hours.
The final dry method simple tension that dry method simple tension diaphragm, the directions second layer TD with the directions first layer MD is made
Three layers of composite diaphragm of diaphragm and the dry method simple tension diaphragm in the directions third layer MD, i.e. ABA structures.The thickness of the composite diaphragm
It is 36 microns, porosity 40%.
Embodiment three
The dry method simple tension diaphragm that this example uses is 12 μm of Shenzhen Zhong Xing innovative materials Technology Co., Ltd. production
Microporous polypropylene membrane.The dry method simple tension diaphragms of volume two are unreeled in membrane unwinding mechanism respectively, it will wherein a roll of dry method list
It is rotated by 90 ° to tensile membrane so that a roll is the directions MD (being indicated with A), and another volume is the directions TD (being indicated with B), and the side MD
It is mutually perpendicular to the directions TD, is stacked together according to the sequence of B-A-B, after cutting into identical size, it is compound to carry out vacuum hotpressing.
Wherein, it is 60 DEG C, pressure 30psi that hot-rolling, which presses compound temperature, and recombination velocity is 50 ms/min.Compound diaphragm is being received
It is wound in volume mechanism.Then, the composite diaphragm of winding is put into baking oven and is made annealing treatment to discharge stress, at baking oven annealing
The temperature of reason is 60 DEG C, and annealing time is 3 hours.
The final dry method simple tension that dry method simple tension diaphragm, the directions second layer MD with the directions first layer TD is made
Three layers of composite diaphragm of diaphragm and the dry method simple tension diaphragm in the directions third layer TD, i.e. BAB structures.The thickness of the composite diaphragm
It is 36 microns, porosity 40%.
The features such as the tensile strength of the composite diaphragm of above example, puncture strength, percent thermal shrinkage, tortuosity are surveyed
Examination.
Wherein, the composite diaphragm thickness testing method of this example is carried out with reference to GB/T 6672-2001, and it is flat to use contact head
The Ma Er calibrators of head measure, and instrument calibration is reset before measurement, and is kept in contact the cleaning in face, along the directions TD of film every
5cm takes a point to measure, and the average value for measuring 5 points is its thickness.
Tensile strength test method is carried out according to reference to GB/T 1040.3-2006, with sanction sample knife along the directions MD and TD of film
It is each 5 of the sample of 100mm × 20mm to take specification, is clipped on the stretching clamp of tensilon, fixture is with the speed of 100mm/min
Degree breaks batten, and software can automatically process to obtain the tensile strength of sample.The average value for measuring 5 points is its tensile strength.
Puncture strength test method is carried out according to reference to GB/T 21302-2007, takes 5 diameters to be more than along the directions TD of film
The circular sample of 40mm is clipped in and punctures in fixture, and tack needle is moved downward with the speed of 100mm/min, and sample is pierced through most
It is puncture strength energetically.The average value for measuring 5 points is its puncture strength.
Thermal contraction test method is carried out with reference to GB/T 12027-2004, is taken and is greater than or equal to along the directions MD and TD of film
Each 5 of the sample of 100mm × 100mm, measures the actual size of sample, and specimen holder is then waited for baking oven among two panels A4 paper
After temperature is stablized, sample is put into baking oven, is taken out after 120 DEG C of heating 1h, measures size and shrinkage from mold dimensions after heating.It surveys
The average value of 5 points of amount is heat-shrinked for it.
Tortuosity is calculated according to diaphragm tortuosity formula：
Wherein, τ is diaphragm tortuosity, dimensionless；NmFor Macmullin values, Nm=σe/σS；Wherein, σeFor electrolyte from
Electron conductivity, unit：mS/cm；It is measured with reference to electrolyte specifications standard value or by conductivity meter；σSFor diaphragm ionic conductance
Rate, unit：mS/cm；Dimensionless；ε is diaphragm porosity, dimensionless.
The results are shown in Table 1 for items test.
1 composite diaphragm the performance test results of table
Table 1 the results show that the composite diaphragm of three embodiments of the application, compared with dry method simple tension diaphragm, the side TD
To with higher tensile strength, the directions the composite diaphragm TD tensile strength of the application is all in 1500kgf/cm2More than, or even can
To reach 1939kgf/cm2, and the tensile strength in the general directions dry method simple tension diaphragm TD is only in 200kgf/cm2Left and right, it is high
The directions TD tensile strength can prevent diaphragm in extreme conditions, the directions TD tearing caused by internal short-circuit of battery and cause
Safety accident.Meanwhile the composite diaphragm of the application increases the tortuosity in hole, the higher battery plus-negative plate of tortuosity in hole is direct
The probability of connection is lower, improves the safety of battery.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is confined to these explanations.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of conceiving from the application, a number of simple deductions or replacements can also be made.
Claims (6)
1. a kind of lithium ion battery composite separation membrane, it is characterised in that：Dry method simple tension including at least two layers parallel stacking every
Film, also, in the simple tension diaphragm of adjacent two layers, one layer is the directions MD, and another layer is the directions TD, the directions MD and the directions TD phase
It is mutually vertical.
2. lithium ion battery composite separation membrane according to claim 1, it is characterised in that：The thickness of the composite diaphragm is 40
Micron or thickness below；
Preferably, the thickness of composite diaphragm is 30 microns or thickness below；
Preferably, the thickness of composite diaphragm is 20 microns or thickness below.
3. lithium ion battery composite separation membrane according to claim 1 or 2, it is characterised in that：The hole of the composite diaphragm
Rate is between 30-70%；
Preferably, the porosity of the composite diaphragm is between 40-60%；
Preferably, the porosity of the composite diaphragm is between 42-55%.
4. according to the preparation method of claim 1-3 any one of them lithium ion battery composite separation membranes, it is characterised in that：Including
Following steps,
It unreels：The dry method simple tension diaphragms of volume two are unreeled in membrane unwinding mechanism respectively；
It is compound：Wherein a roll of dry method simple tension diaphragm is rotated by 90 ° so that a roll is the directions MD, and another volume is the directions TD,
And the directions MD and the directions TD are mutually perpendicular to, and are stacked in order, after cutting into identical size, are carried out in the case where applying stress
Vacuum hotpressing is compound；
Winding：Compound diaphragm is wound on rolling-up mechanism；
Annealing：The composite diaphragm of winding is put into baking oven and is made annealing treatment to discharge stress, to which the lithium ion be made
Battery composite diaphragm.
5. preparation method according to claim 4, it is characterised in that：It is 20~150 DEG C that the hot-rolling, which presses compound temperature,
Preferably 30~100 DEG C, more preferably 50~80 DEG C；
It is 5-80psi, preferably 10-60psi, more preferably 20-50psi that the hot-rolling, which presses compound pressure,；
It is 20~100 ms/min that the hot-rolling, which presses compound speed, preferably 30~80 ms/min, more preferably 45~60
M/min.
6. preparation method according to claim 4, it is characterised in that：The temperature of the annealing is 20~100 DEG C, excellent
It is selected as 30~80 DEG C, more preferably 50~70 DEG C；
The time of the annealing is 0~10 hour, preferably 2~6 hours, more preferably 2~4 hours.
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| CN201810019497.XA CN108305978B (en) | 2018-01-09 | 2018-01-09 | Lithium ion battery composite diaphragm and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810019497.XA CN108305978B (en) | 2018-01-09 | 2018-01-09 | Lithium ion battery composite diaphragm and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935756A (en) * | 2018-11-27 | 2019-06-25 | 万向一二三股份公司 | Preparation method of lithium ion battery composite diaphragm and lithium ion battery containing composite diaphragm |
| CN110333461A (en) * | 2019-05-29 | 2019-10-15 | 合肥国轩高科动力能源有限公司 | Method for representing wettability of electrolyte through tortuosity |
| CN112054149A (en) * | 2019-06-05 | 2020-12-08 | 万向一二三股份公司 | Novel lithium ion battery composite diaphragm and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723304A2 (en) * | 1994-12-22 | 1996-07-24 | Hoechst Celanese Corporation | Methods of making cross-ply microporous membrane battery separator, and the battery separators made thereby |
| CN103407811A (en) * | 2013-08-06 | 2013-11-27 | 达尼特材料科技（芜湖）有限公司 | Multilayer membrane compounding machine and control method thereof |
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
| CN105470433A (en) * | 2014-09-29 | 2016-04-06 | 株式会社杰士汤浅国际 | Energy storage device and method of producing energy storage device |
| CN107369804A (en) * | 2017-08-06 | 2017-11-21 | 长沙小新新能源科技有限公司 | A kind of preparation method of lithium battery security diaphragm material |
-
2018
- 2018-01-09 CN CN201810019497.XA patent/CN108305978B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723304A2 (en) * | 1994-12-22 | 1996-07-24 | Hoechst Celanese Corporation | Methods of making cross-ply microporous membrane battery separator, and the battery separators made thereby |
| CN103407811A (en) * | 2013-08-06 | 2013-11-27 | 达尼特材料科技（芜湖）有限公司 | Multilayer membrane compounding machine and control method thereof |
| CN105470433A (en) * | 2014-09-29 | 2016-04-06 | 株式会社杰士汤浅国际 | Energy storage device and method of producing energy storage device |
| CN105374969A (en) * | 2015-10-28 | 2016-03-02 | 惠州市吉美泰电子科技有限公司 | Lithium battery diaphragm with interlayer, lithium battery and manufacturing method of lithium battery diaphragm |
| CN107369804A (en) * | 2017-08-06 | 2017-11-21 | 长沙小新新能源科技有限公司 | A kind of preparation method of lithium battery security diaphragm material |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935756A (en) * | 2018-11-27 | 2019-06-25 | 万向一二三股份公司 | Preparation method of lithium ion battery composite diaphragm and lithium ion battery containing composite diaphragm |
| CN109935756B (en) * | 2018-11-27 | 2022-05-13 | 万向一二三股份公司 | Preparation method of lithium ion battery composite diaphragm and lithium ion battery containing composite diaphragm |
| CN110333461A (en) * | 2019-05-29 | 2019-10-15 | 合肥国轩高科动力能源有限公司 | Method for representing wettability of electrolyte through tortuosity |
| CN110333461B (en) * | 2019-05-29 | 2021-12-03 | 合肥国轩高科动力能源有限公司 | Method for representing wettability of electrolyte through tortuosity |
| CN112054149A (en) * | 2019-06-05 | 2020-12-08 | 万向一二三股份公司 | Novel lithium ion battery composite diaphragm and preparation method thereof |
| CN112054149B (en) * | 2019-06-05 | 2022-06-14 | 万向一二三股份公司 | Lithium ion battery composite diaphragm and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN108305978B (en) | 2022-08-02 |
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