CN109065807A - A kind of oiliness PVDF coating, its preparation process and its coating method for lithium ion battery separator - Google Patents
A kind of oiliness PVDF coating, its preparation process and its coating method for lithium ion battery separator Download PDFInfo
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- CN109065807A CN109065807A CN201810862016.1A CN201810862016A CN109065807A CN 109065807 A CN109065807 A CN 109065807A CN 201810862016 A CN201810862016 A CN 201810862016A CN 109065807 A CN109065807 A CN 109065807A
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- coating
- pvdf
- mixed solution
- lithium ion
- ion battery
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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
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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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of oiliness PVDF coating, its preparation process and its coating methods for lithium ion battery separator, are related to lithium ion battery separator technical field.The PVDF coating includes that mass ratio is (85~98): first mixed solution and the second mixed solution of (2~15)；First mixed solution includes that mass ratio is 100:(2~7): (2~7.5): the first organic solvent, PVDF, PVDF adhesive and the pore creating material of (2~16)；Second mixed solution includes that mass ratio is (15~30): 100 ceramic particle and the second organic solvent.The PVDF coating can be improved the cohesive force and thermal stability of diaphragm, reduce diaphragm electrostatic, reduce diaphragm retracts rate.
Description
Technical field
The present invention relates to lithium ion battery separator technical fields, are used for lithium ion battery separator in particular to one kind
Oiliness PVDF coating, its preparation process and its coating method.
Background technique
Lithium ion battery becomes nowadays important one of new energy with its high-energy density and long circulation life, but with state
The promotion that family requires battery energy density, and while energy density improves, the safety of positive electrode becomes hidden danger,
Diaphragm plays safety effect, hereafter, occurs ceramics, PVDF, aramid fiber in the market as one of big main material of lithium battery four
Equal coated separators.
Often there are some problems during existing oiliness PVDF coating lithium battery diaphragm, firstly, PVDF coating is coated with
Shi Chengkong is difficult, and air penetrability is big, and pore-forming is uneven.The cohesive force of PVDF coating is too small, is easy to appear and serious drops off phenomenon.Its
Secondary, single PVDF lysate electrostatic is very big, adsorbs roll shaft, causes application difficulties.Oiliness PVDF is straight in extraction process of setting
Connect chance water-setting makes the PVDF pore-creating of membrane surface uneven admittedly, and the PVDF on diaphragm is allowed to have a sufficient pore-creating empty in extraction
Between by being important.
Summary of the invention
The first object of the present invention is to provide a kind of oiliness PVDF coating for lithium ion battery separator, can mention
The thermal stability and cohesive force of diaphragm of the height coated with the coating, reduce diaphragm electrostatic, reduce the shrinking percentage of diaphragm.
The second object of the present invention is to provide a kind of lithium ion battery separator, high with thermal stability, and cohesive force is good
The advantages of.
The third object of the present invention is to provide a kind of lithium ion battery, with good security performance and electrochemistry
Energy.
The fourth object of the present invention is to provide a kind of preparation work of oiliness PVDF coating for lithium ion battery separator
Skill can prepare above-mentioned oiliness PVDF coating.
The fifth object of the present invention is to provide a kind of coating side of oiliness PVDF coating for lithium ion battery separator
Method improves the cohesive force of the diaphragm coated with PVDF coating, reduces the shrinking percentage of diaphragm.
The present invention is implemented as follows:
A kind of oiliness PVDF coating for lithium ion battery separator, PVDF coating include that mass ratio is (85~98):
First mixed solution and the second mixed solution of (2~15)；
First mixed solution includes that mass ratio is 100:(2~7): (2~7.5): first organic solvent of (2~16),
PVDF, PVDF adhesive and pore creating material；
Second mixed solution includes that mass ratio is (15~30): 100 ceramic particle and the second organic solvent.
A kind of lithium ion battery separator comprising substrate and the coating being coated on substrate, coating is by above-mentioned oiliness
PVDF coating is coated with to obtain.
A kind of lithium ion battery comprising above-mentioned lithium ion battery separator.
A kind of preparation process of the oiliness PVDF coating for lithium ion battery separator itself the following steps are included:
Be 100:(2~7 by mass ratio): (2~7.5): first organic solvent of (2~16), PVDF, PVDF adhesive with
And the first mixed solution for being mixed to get of pore creating material and mass ratio are (15~30): 100 ceramic particle and the second organic solvent
The the second mixed solution mixing being mixed to get；Wherein, the mass ratio of the first mixed solution and the second mixed solution is (85~98):
(2~15).
A kind of coating method of the oiliness PVDF coating for lithium ion battery separator comprising by above-mentioned oiliness PVDF
Applying coating is on substrate.
The invention has the following advantages:
The embodiment of the present invention provides a kind of oiliness PVDF coating for lithium ion battery separator, which includes
Mass ratio is (85~98): first mixed solution and the second mixed solution of (2~15).First mixed solution includes mass ratio
For 100:(2~7): (2~7.5): the first organic solvent, PVDF, PVDF adhesive and the pore creating material of (2~16), second is mixed
Conjunction solution includes that mass ratio is (15~30): 100 ceramic particle and the second organic solvent.The PVDF coating can be improved painting
It is covered with the thermal stability and cohesive force of the diaphragm of the coating, diaphragm electrostatic can be reduced, reduces the shrinking percentage of diaphragm.
The embodiment of the present invention provides the preparation process and coating method of PVDF coating, which can be improved coating
There is the cohesive force of the diaphragm of PVDF coating, reduces the shrinking percentage of diaphragm.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram for the SEM surface covering for being coated with PVDF coating that first embodiment of the invention provides.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Below to the oiliness PVDF coating oiliness provided in an embodiment of the present invention for lithium ion battery separator, its preparation work
Skill and its coating method are specifically described.
Oiliness PVDF coating provided in an embodiment of the present invention for lithium ion battery separator, which includes matter
Amount is than being (85~98): first mixed solution and the second mixed solution of (2~15).Specifically, the first mixed solution and second
The mass ratio of mixed solution can be 85:15,86:14,87:13,88:12,89:11,90:10,91:9,92:8,93:7,94:
6,95:5,96:4,97:3 or 98:2 etc..
Further, it is 100:(2~7 that above-mentioned first mixed solution, which includes mass ratio): (2~7.5): (2~16)
First organic solvent, PVDF, PVDF adhesive and pore creating material.
Wherein, PVDF is also known as Kynoar, is powder or particle, is a kind of copolymer, in the present invention, point of PVDF
Son amount is 600000~900000g/mol.First organic solvent is DMAC (dimethyl acetamide), NMP (N- crassitude
Ketone), one of DMF (dinethylformamide) and DMP (repefral) or a variety of, PVDF adhesive can be with
For one or more of PI (polyimides), PVDF homopolymer, PVP-VA (vinyl propionate copolymer).Pore creating material is carbonic acid
It is vinyl acetate, propene carbonate, diethyl carbonate, dimethyl carbonate, one or more of in methyl ethyl carbonate.
Specifically, the mass ratio of the first organic solvent, PVDF, PVDF adhesive and pore creating material can for 100:2:2:2,
100:3:2:2,100:4:2:2,100:5:2:2,100:6:2:2,100:7:2:2,100:4:3:2,100:4:4:2,100:4:
5:2,100:4:6:2,100:4:7.5:2,100:5:4:3,100:5:4:4,100:4:4:5,100:4:4:6,100:4:4:7,
100:4:4:8,100:4:4:9,100:4:4:10,100:4:4:11,100:5:6:12,100:5:6:13,100:4:5:14,
100:4:5:15 and 100:6:6:16 etc..
The embodiment of the present invention controls the ratio of PVDF, PVDF adhesive, the first organic solvent and pore creating material in PVDF coating
Column improve the cohesive force of PVDF coating, and avoiding or reducing PVDF, there is a phenomenon where seriously drop off.Enable PVDF coating more
Stable is coated on lithium ion battery separator, plays its function and effect.
The second above-mentioned mixed solution includes that mass ratio is (15~30): 100 ceramic particle and the second organic solvent.
Specifically, ceramic particle includes one of alumina particle, barium titanate particles, magnesium hydroxide particle and silica dioxide granule
Or it is a variety of.Second organic solvent includes one of ethyl alcohol, isopropanol, DMAC and tripropylene glycol or a variety of.
The mass ratio of ceramic particle and the second organic solvent can be 15:100,16:100,17:100,18:100,19:
100,20:100,21:100,22:100,23:100,24:100,25:100,26:100,27:100,28:100,29:100 and
30:100.
The embodiment of the present invention adds the ceramic particle of said ratio in PVDF coating, can be improved and applies coated with the PVDF
The thermal stability of the diaphragm of material reduces diaphragm electrostatic, and the air penetrability and diaphragm for improving diaphragm are in the battery in the leaching of electrolyte
Lubricant nature.
The embodiment of the present invention also provides a kind of lithium ion battery separator comprising substrate and the painting being coated on substrate
Layer, coating are coated with to obtain by above-mentioned oiliness PVDF coating.
Specifically, lithium ion battery separator substrate with a thickness of 10~14 μm.PVDF applying coating is in the painting thickness of diaphragm
Degree is 1.5~2.5 μm.Specifically, lithium ion battery separator substrate with a thickness of 10 μm, 11 μm, 12 μm, 13 μm or 14 μm,
PVDF applying coating is 1.5~2.5 μm in the coating layer thickness of diaphragm.PVDF coating layer thickness is 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μ
M, 1.9 μm, 2.0 μm, 2.1 μm, 2.2 μm, 2.3 μm, 2.4 μm or 2.5 μm.
The embodiment of the present invention provides a kind of lithium ion battery comprising has above-mentioned lithium ion battery separator.
Preparation process provided in an embodiment of the present invention for lithium ion battery separator oiliness PVDF coating comprising following
Step:
Be 100:(2~7 by mass ratio): (2~7.5): first organic solvent of (2~16), PVDF, PVDF adhesive with
And the first mixed solution for being mixed to get of pore creating material and mass ratio are (15~30): 100 ceramic particle and the second organic solvent
The the second mixed solution mixing being mixed to get.
Wherein, the mass ratio of the first mixed solution and the second mixed solution is (85~98): (2~15).
The coating method of oiliness PVDF coating provided in an embodiment of the present invention for lithium ion battery separator comprising will
Above-mentioned oiliness PVDF applying coating is on substrate.
Specifically, during oiliness PVDF applying coating is on base material, coating speed is 5~15m/min.Coating
Speed can for 5m/min, 6m/min, 7m/min, 8m/min, 9m/min, 10m/min, 11m/min, 12m/min, 13m/min,
14m/min or 15m/min.The range of choice of the coating speed can preferably by PVDF applying coating in lithium ion battery every
On film.
Further, after PVDF coating is coated on substrate, coating method includes in the PVDF coating to formation
Organic solvent and pore creating material are extracted.Preferably, which includes will have the substrate of PVDF coating to carry out first
Stage extraction and second stage extraction:
First stage extraction is extracted including at least 3 times, in the first stage used by least 3 times extractions in extraction overshoot
The concentration of extractant is successively successively decreased.Specifically, in first stage extraction process extractant using in DMAC, NMP, DMF, DMP
It is one or more.
Second stage extraction is extracted using deionized water.
Successively successively decrease can targetedly will be in the PVDF coating of formation for the concentration of extractant in first stage extraction
Organic solvent and pore creating material wash out, and second stage extraction carries out extraction using deionized water and is to be able to more thoroughly to
Organic solvent and pore creating material are extracted from PVDF coating.Fractional extraction can reduce oiliness PVDF coating and solidify in extraction
Directly water is met in journey and with the leading to membrane surface non-uniform phenomenon of PVDF pore-creating, enable organic solvent and pore creating material in PVDF
It is enough thoroughly to wash out, the cohesive force of PVDF coating is improved, diaphragm retracts rate is reduced.
After the extraction step, coating method further includes baking step, and baking step includes putting PVDF coating extracted
Enter oven drying, 35 DEG C~40 DEG C 1~2min of baking.Specifically, drying temperature can be 35 DEG C, 36 DEG C, 37 DEG C, 38 DEG C, 39
DEG C and 40 DEG C.Baking step can be improved the formation time of PVDF coating, enable PVDF be more steadily pasted on lithium from
On sub- battery diaphragm.
Feature and performance of the invention are described in further detail with reference to embodiments.
First embodiment
The present embodiment provides a kind of coating methods of oiliness PVDF coating for lithium ion battery separator comprising following
Step:
The preparation of first mixed solution:
The first organic solvent, PVDF, PVDF adhesive and pore creating material that mass ratio is 100:4:4:10 are mixed to get
The first mixed solution.Wherein, the first organic solvent is DMAC, and PVDF adhesive is PVDF homopolymer, and pore creating material is carbonic acid second
Enester.
The preparation of second mixed solution:
By the ceramic particle that mass ratio is 20:100 and the second mixed solution that the second organic solvent is mixed to get.Wherein,
Second organic solvent is ethyl alcohol, and ceramic particle is alumina particle.
The preparation of PVDF coating:
First mixed solution is mixed with the second mixed solution according to mass ratio for 85:15.
The coating of PVDF coating:
By the PVDF applying coating of above-mentioned preparation on the lithium ion battery separator substrate with a thickness of 12 μm, applied thickness is
2.0 μm, coating speed 15m/min.
The extraction of PVDF coating:
First extraction step includes 3 extraction tanks, and the different extractant of concentration is sequentially placed in each extraction tank, extraction
Agent uses N-Methyl pyrrolidone, and the extractant concentration of extraction is 60% for the first time, and the extractant concentration of second of extraction is
40%, the concentration of the extractant of third time extraction is 20%.
Second extraction step includes 3 extraction tanks, and deionized water is placed in extraction tank for extracting.
The drying of PVDF coating:
Diaphragm extracted is put in oven, 35 DEG C of baking 2min obtain PVDF coating, please refer to attached drawing 1 after baking, figure
1 is the display diagram for the first example PVDF coat side done by electron microscope.
First comparative example
The performance for the lithium ion battery separator that the PVDF coating method that verifying first embodiment provides obtains.
Experimental method
The lithium ion on lithium ion battery separator and existing market obtained using the coating method that first embodiment provides
Battery diaphragm compares.
Ventilative test method: in the case where fixed diaphragm, certain air pressure is applied to diaphragm side, due to existing on diaphragm
Micropore, which can gradually decrease, until being equal to atmospheric pressure.Compare pressure to drop to used in termination pressure from initial pressure
Time just measures the air permeability of the diaphragm.
Needle pierces strength test method: applying the power that given aciculiform object is used to expose diaphragm sample on diaphragm.
Shrinking percentage test method: the rectangle diaphragm of certain area is put into the oven of certain temperature, at the appointed time
The size ratio that diaphragm is shunk.
Bonding force test method: being bonded in diaphragm coat side with the 3M adhesive tape that width is 12.7mm, length is 10cm, is used
Certain speed pulls open power suffered when film and adhesive tape.
Experimental result
The performance of 1 lithium ion battery separator of table
As shown in table 1, the diaphragm cohesive force with PVDF coating that first embodiment provides significantly improves, and reduces and is heat-shrinked
Rate.
Second comparative example
It verifies first embodiment and the component proportion of PVDF coating is provided.
Using the component proportion for the PVDF coating that first embodiment provides, comparison the first reference examples of setting, in the first control
In example, by percentage to the quality, in PVDF grain dissolution to DMAC, DMC pore creating material is added in a solvent, obtain PVDF painting
Cover coating.Wherein PVDF accounts for 15%, and pore creating material accounts for 7%, DMAC and accounts for 78%.
The coating method that two groups of embodiments are all made of first embodiment offer is coated, obtained lithium ion battery separator
It is tested for the property, experimental result is as shown in table 2.
Ventilative test method: in the case where fixed diaphragm, certain air pressure is applied to diaphragm side, due to existing on diaphragm
Micropore, which can gradually decrease, until being equal to atmospheric pressure.Compare pressure to drop to used in termination pressure from initial pressure
Time just measures the air permeability of the diaphragm.
Needle pierces strength test method: applying the power that given aciculiform object is used to expose diaphragm sample on diaphragm.
Shrinking percentage test method: the rectangle diaphragm of certain area is put into the oven of certain temperature, at the appointed time
The size ratio that diaphragm is shunk.
Bonding force test method: being bonded in diaphragm coat side with the 3M adhesive tape that width is 12.7mm, length is 10cm, is used
Certain speed pulls open power suffered when film and adhesive tape.
Experimental result
2 experimental test data of table
From table 2 it can be seen that the component proportion of the oil system PVDF coating provided using first embodiment of the invention is prepared into
The diaphragm arrived improves the performance of diaphragm, and 130 DEG C of percent thermal shrinkages reduce by 8%~10%, and needle pierces enhanced strength 1%~3%, thoroughly
Gas rate reduces by 5%~8%, cohesive force enhancing 5%~15%.To sum up, it is provided in an embodiment of the present invention for lithium ion battery every
The oiliness PVDF coating of film, PVDF coating include that mass ratio is (85~98): first mixed solution of (2~15) and second mixes
Close solution；First mixed solution includes that mass ratio is 100:(2~7): (2~7.5): first organic solvent of (2~16),
PVDF, PVDF adhesive and pore creating material；Second mixed solution include mass ratio be (15~30): 100 ceramic particle with
Second organic solvent.The PVDF coating can be improved the thermal stability and cohesive force of the diaphragm coated with the coating, reduce diaphragm
Electrostatic reduces the shrinking percentage of diaphragm.
The embodiment of the present invention provides the preparation process and coating method of PVDF coating, which can be improved coating
There is the cohesive force of the diaphragm of PVDF coating, reduces the shrinking percentage of diaphragm.
In addition, the embodiment of the present invention also provides lithium ion battery separator and lithium-ion electric with above-mentioned PVDF coating
Pond.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of oiliness PVDF coating for lithium ion battery separator, which is characterized in that the PVDF coating includes quality
Than for (85~98): first mixed solution and the second mixed solution of (2~15)；
First mixed solution includes that mass ratio is 100:(2~7): (2~7.5): first organic solvent of (2~16),
PVDF, PVDF adhesive and pore creating material；
Second mixed solution includes that mass ratio is (15~30): 100 ceramic particle and the second organic solvent.
2. oiliness PVDF coating according to claim 1, which is characterized in that the ceramic particle is alumina particle, titanium
One of sour titanate particle, magnesium hydroxide particle and silica dioxide granule are a variety of.
3. oiliness PVDF coating according to claim 2, which is characterized in that in first mixed solution, described
One organic solvent includes one of DMAC, NMP, DMF and DMP or a variety of；
In second mixed solution, second organic solvent includes in ethyl alcohol, isopropanol, DMAC and tripropylene glycol
It is one or more.
4. a kind of lithium ion battery separator, which is characterized in that it includes substrate and the coating that is coated on the substrate, described
Coating is coated with to obtain by the described in any item oiliness PVDF coating of claims 1 to 3.
5. a kind of lithium ion battery, which is characterized in that it includes by lithium ion battery separator as claimed in claim 4.
6. a kind of preparation process of the oiliness PVDF coating for lithium ion battery separator, which is characterized in that it includes following step
It is rapid:
It is 100:(2~7 by mass ratio): (2~7.5): first organic solvent of (2~16), PVDF, PVDF adhesive and make
The first mixed solution that hole agent is mixed to get is (15~30) with mass ratio: 100 ceramic particle and the second organic solvent mix
Obtained the second mixed solution mixing；Wherein, the mass ratio of the first mixed solution and the second mixed solution is (85~98): (2~
15)。
7. a kind of coating method of the oiliness PVDF coating for lithium ion battery separator, which is characterized in that it includes by right
It is required that 1~3 described in any item oiliness PVDF applying coatings are on substrate.
8. coating method according to claim 7, which is characterized in that be coated on substrate by the oiliness PVDF coating
During, coating speed is 5~15m/min.
9. coating method according to claim 8, which is characterized in that after the PVDF coating is coated on substrate,
The coating method includes that organic solvent in the PVDF coating to formation and pore creating material extract；
Preferably, it is described carry out extraction specifically include by the substrate with PVDF coating successively carry out the first stage extraction with
And second stage extraction；
The first stage extraction is extracted including at least 3 times, and at least 3 times extractions in the first stage extraction process are adopted
The concentration of extractant is successively successively decreased；
The second stage extraction is extracted using deionized water.
10. coating method according to claim 9, which is characterized in that after the extraction step, the coating method further includes
Baking step, the baking step include that PVDF coating extracted is put into oven drying, and 35 DEG C~40 DEG C bakings 1~
2min。
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| CN112821009A (en) * | 2019-11-15 | 2021-05-18 | 珠海恩捷新材料科技有限公司 | Lithium battery diaphragm and preparation method of lithium ion battery |
| CN112909425A (en) * | 2021-01-20 | 2021-06-04 | 河北金力新能源科技股份有限公司 | High-efficiency long-life lithium-sulfur battery diaphragm and preparation method thereof |
| CN114122623A (en) * | 2020-08-31 | 2022-03-01 | 青岛蓝科途膜材料有限公司 | Lithium ion battery diaphragm, preparation method and application thereof |
| CN114883745A (en) * | 2022-06-02 | 2022-08-09 | 中材锂膜(宁乡)有限公司 | Method for producing a separator, electrochemical cell using said separator, and electrical device |
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| CN114122623A (en) * | 2020-08-31 | 2022-03-01 | 青岛蓝科途膜材料有限公司 | Lithium ion battery diaphragm, preparation method and application thereof |
| CN112909425A (en) * | 2021-01-20 | 2021-06-04 | 河北金力新能源科技股份有限公司 | High-efficiency long-life lithium-sulfur battery diaphragm and preparation method thereof |
| CN114883745A (en) * | 2022-06-02 | 2022-08-09 | 中材锂膜(宁乡)有限公司 | Method for producing a separator, electrochemical cell using said separator, and electrical device |
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Application publication date: 20181221 |