CN107359300A - A kind of lithium ion battery separator of aramid fiber composite coated and preparation method thereof - Google Patents
A kind of lithium ion battery separator of aramid fiber composite coated and preparation method thereof Download PDFInfo
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- CN107359300A CN107359300A CN201710519368.2A CN201710519368A CN107359300A CN 107359300 A CN107359300 A CN 107359300A CN 201710519368 A CN201710519368 A CN 201710519368A CN 107359300 A CN107359300 A CN 107359300A
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- aramid fiber
- fiber composite
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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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic 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
- 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
- H01M50/44—Fibrous 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
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention relates to lithium ion battery separator of aramid fiber composite coated and preparation method thereof, the barrier film includes lithium ion battery basement membrane and is coated on the coating of the basement membrane unilateral or bilateral, by aramid fiber composite mortar is coated, water vapour preheats, is obtained after hot-air seasoning, the composition and weight ratio of the aramid fiber composite mortar are the coating:Aramid fiber polymeric compound：5~20%；Solvent：80~90%；Adhesive：0~8%.The aramid fiber of the present invention, which meets coating barrier film, has good mechanical performance and heat-resisting quantity, meanwhile, the barrier film has open pore structure, its wetability to electrolyte is substantially improved, in addition, it has, environment-friendly, cost is low, technique is simple, the features such as being easy to continuous production.
Description
Technical field
The invention belongs to technical field of lithium ion, is related to a kind of lithium ion battery separator and preparation method thereof method,
More particularly to a kind of lithium ion battery separator of aramid fiber composite coated and preparation method thereof.
Background technology
Lithium ion battery have the characteristics that energy density is high, operating voltage is high, memory-less effect and have extended cycle life and by
It is widely used as the power supply of various mobile devices.Lithium ion battery generally includes positive pole, negative pole, barrier film and electrolyte.Barrier film conduct
Barrier between both positive and negative polarity plays vital effect to the performance of lithium ion battery, therefore by improving the performance of barrier film
Received more and more attention to improve the research of the security of lithium ion battery, usability, manufacturability.
At present, the barrier film that lithium ion battery uses is generally polyolefin porous membrane, and its fusing point is less than 170 DEG C.When battery temperature
When degree raises because of internal or external factor, barrier film can shrink or melt and then holes occur, and cause battery plus-negative plate contact to lead
Battery short circuit is caused, causes the generation of the contingencies such as cells burst blast.
When preparing the lithium ion battery separator of aramid fiber coating, more directly using organic solvents such as DMAC, DMF, NMP, DMSO
Coordinate cosolvent dissolving aramid fiber to prepare aramid fiber lysate, then add pore former and obtain aramid fiber slurry, make coat film leaching solidification
Liquid solidifies, and most coats lithium ion battery separator through washing, drying obtained aramid fiber afterwards.This method still suffers from problems with：Firstth, it is fragrant
Synthetic fibre fiber needs to dissolve by heating, and the process can cause part aramid fiber to decompose, and cause heat resistance and mechanical degradation；Secondth,
Mass transfer dynamicses of this method between by the thermodynamic state and slurry and solidification liquid of slurry dominate jointly, and influence factor is complicated,
Porosity control is difficult；3rd, coating is made up of dense layer surface and loose porous subgrade, and the generation of dense layer surface can hinder lithium
The migration of ion, influence the wettability of electrolyte and barrier film；4th, the change of solidification liquid composition is various, and majority has for high concentration
Machine solution, while causing cost pressure, cause recovery and the problems such as environmental pollution.
Therefore, Application No. 201510457866.X Chinese invention patent discloses a kind of lithium of aramid fiber polymer coated
Ion battery barrier film and preparation method thereof, it overcomes to a certain extent is preparing the lithium ion of aramid fiber coating in the prior art
The problems of during battery diaphragm.But it still has following prominent question：1st, it still needs the breast for using low melting point
Agent, so that the resistance to elevated temperatures of coating is restricted；2nd, it needs to use multi-solvents, and prepared by organic solvent
It can not be collected and be reclaimed in journey, cause easily to cause environmental pollution；3rd, it must use adhesive, be further exacerbated by ring
Pollute in border.
In view of the drawbacks described above of prior art, there is an urgent need to develop a kind of new lithium ion battery separator and its preparation side
Method.
The content of the invention
A kind of it is contemplated that above mentioned problem in the presence of overcoming prior art, there is provided lithium ion of aramid fiber composite coated
Battery diaphragm and preparation method thereof, its resistance to elevated temperatures is more preferable and non-environmental-pollution problem.
To achieve these goals, the present invention provides following technical scheme：
A kind of lithium ion battery separator of aramid fiber composite coated, including lithium ion battery basement membrane and be coated on the basement membrane it is unilateral or
The coating of bilateral, by aramid fiber composite mortar is coated, water vapour preheats, is obtained after hot-air seasoning, its feature exists the coating
In,
The composition and weight ratio of the aramid fiber composite mortar be:
Aramid fiber polymeric compound：5~20%；
Solvent：80~90%；
Adhesive：0~8%.
Further, wherein, the solvent is the one or more in NMP, DMSO, DMF or DMAC.
Further, wherein, the adhesive is：PVDF or GMA.
Yet further, wherein, the lithium ion battery basement membrane be thickness be 5-40 μm, porosity be the poly- of 30-60%
Vinyl film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials basement membrane, polyimide base film, polyvinylidene fluoride
One kind in film, polyethylene nonwoven basement membrane, polypropylene non-woven fabric basement membrane and polyimide nonwoven fabric basement membrane.
In addition, the present invention also provides a kind of preparation method of the lithium ion battery separator of above-mentioned aramid fiber composite coated, it is special
Sign is, comprises the following steps：
（1）, by the weight than aramid fiber polymeric compound and adhesive add in the solvent, virtue is made to being completely dissolved in stirring
Synthetic fibre composite mortar;
（2）, by the aramid fiber composite paste in the lithium ion battery membrane surface through sided corona treatment, coat film is made；
（3）, coat film is carried out to 5-800s preheating by 40-90 DEG C of negative pressure low temperature water vapour, make institute in the process
State aramid fiber composite mortar and phase transfer occurs with adhesive, water vapour is evaporated to gas with solvent in this process, and concentrates back
Receive；
（4）, carry out hot-air seasoning after preheating.
Further, wherein, the step（4）In hot-air seasoning be with 40-90 DEG C of hot-air seasoning 5-800s.
Further, wherein, the step（2）In coating for intaglio plate coating, narrow slit type coating, dip-coating formula coating or
One kind in jet printing type coating.
Compared with lithium ion battery separator and preparation method thereof, the lithium ion battery separator of aramid fiber composite coated of the invention
And preparation method thereof there are following advantageous effects：
1st, it need not use the emulsifying agent of low melting point, so that coating has more preferable resistance to elevated temperatures.
2nd, it needs to use a kind of organic solvent, and organic solvent can be evaporated and centralized recovery in preparation process,
Environment will not be polluted.
3rd, it can lack with even without adhesive, be more conducive to environmental protection.
4th, it passes through negative pressure low temperature water vapour（40~90 degree of temperature）Directly with the membrane contacts after coating, in contact process
Water vapour dissolves each other with the organic solvent in the coating materials bed of material, and the mixture of organic solvent and water vapour is heated evaporation and taken away, together
With adhesive phase transfer occurs in the coating for Shi Fanglun, so that barrier film has open pore structure, makes its wetting to electrolyte
Property is substantially improved.
Brief description of the drawings
Fig. 1 is the flow chart of the preparation method of the lithium ion battery separator of the aramid fiber composite coated of the present invention.
Fig. 2 is the surface topography map of the lithium ion battery separator of the aramid fiber composite coated of the present invention, and what is be shown in which opens
Discharge hole structure.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples, and the content of embodiment is not as the guarantor to the present invention
Protect the limitation of scope.
The present invention relates to a kind of lithium ion battery separator of aramid fiber composite coated.With Application No. 201510457866.X's
Chinese invention patent is similar, and the lithium ion battery separator of aramid fiber composite coated of the invention also includes lithium ion battery basement membrane and painting
It is distributed in the coating of the basement membrane unilateral or bilateral.And, it is preferable that the lithium ion battery basement membrane be thickness be 5-40 μm, hole
Gap rate is 30-60% polyethylene based film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials basement membrane, polyimide-based
One in film, Kynoar basement membrane, polyethylene nonwoven basement membrane, polypropylene non-woven fabric basement membrane and polyimide nonwoven fabric basement membrane
Kind.
Coating described in Chinese invention patent with Application No. 201510457866.X is coated, pre- solidifying by aramid fiber slurry
Gu, immersion, obtain after drying it is different, in the present invention, the coating by aramid fiber composite mortar is coated, water vapour preheating,
Obtained after hot-air seasoning.It is, in the present invention, it is not necessary to carry out pre- consolidated and immersion, but use water vapour to preheat
Handle to obtain open pore structure.It is, in the present invention, pass through negative pressure low temperature water vapour（40~90 degree of temperature）Directly with
Membrane contacts after coating, water vapour dissolves each other with the organic solvent in the coating materials bed of material in contact process, and organic solvent steams with water
The mixture of vapour is heated evaporation and taken away, while with adhesive phase transfer occurs in the coating for aramid fiber, is opened so that barrier film has
Discharge hole structure, its wetability to electrolyte is substantially improved；Moreover, in the process, organic solvent and water can make it that
Steam evaporates together, consequently facilitating the centralized recovery of organic solvent, prevents the pollution of the environment.
Meanwhile in the present invention, the composition and weight ratio of the aramid fiber composite mortar are:Aramid fiber polymeric compound：5~20%；
Solvent：80~90%；Adhesive：0~8%.It is, it is different from Application No. 201510457866.X Chinese invention patent,
In the present invention, it is not necessary to using emulsifying agent, and only need to use a kind of solvent.Due to the emulsification of low melting point need not be used
Agent, so that the coating in the present invention has more preferable resistance to elevated temperatures.Meanwhile adhesive is 0~8%, it is meant that can not
Using or using a small amount of adhesive, environmental protection is more conducive to.
In the present invention, it is preferred to the solvent is the one or more in NMP, DMSO, DMF or DMAC.
It is highly preferred that the adhesive is：PVDF（Kynoar）Or GMA（GMA）.
In addition, the present invention also provides a kind of preparation method of the lithium ion battery separator of above-mentioned aramid fiber composite coated.Such as Fig. 1
Shown, preparation method of the invention comprises the following steps：
First, by the weight than aramid fiber polymeric compound and adhesive（Certainly, as needed, adhesive can also be added without）Add
Enter in the solvent, aramid fiber composite mortar is made to being completely dissolved in stirring.
It is, in the present invention, directly dissolving aramid fiber liquid is replaced to prepare aramid fiber slurry using aramid fiber polymeric compound, only
Need to stir at normal temperatures.On the basis of the energy is saved, reduce solvent volatile quantity, aramid fiber is fine caused by avoiding heating
The resolution problem of dimension, aramid fiber excellent mechanical performance and heat resistance can be kept to greatest extent.Also, it need not use
To the emulsifying agent of low melting point, so that the coating in the present invention has more preferable resistance to elevated temperatures.
Secondly, by the aramid fiber composite paste in the lithium ion battery membrane surface through sided corona treatment, obtained coating
Film.
In the present invention, it is preferred to the coating is intaglio plate coating, narrow slit type is coated with, the coating of dip-coating formula or jet printing type apply
One kind in cloth.Specific coating method is selected as needed by user, and the present invention is not limited.
Again, coat film is carried out to 5-800s preheating by 40-90 DEG C of negative pressure low temperature water vapour.In this process
In, by using the preheating of 40-90 DEG C of negative pressure low temperature water vapour progress 5-800 seconds（Need strictly to control pre-warmed water
The temperature and preheating time of steam）, make the aramid fiber composite mortar that phase transfer occur with adhesive, water vapour and solvent are herein
Process is evaporated to gas, and carries out centralized recovery.It is, by negative pressure steam（Temperature is 40-90 DEG C）Directly with after coating
Coat film contact, water vapour dissolves each other with the organic solvent in coat film in contact process, the mixing of organic solvent and water vapour
Body is heated evaporation and taken away, while with adhesive phase transfer occurs in the coating for aramid fiber.Also, in the process, it can be formed such as
Opening pore structure shown in Fig. 2, so that its wetability to electrolyte is substantially improved.
Finally, hot-air seasoning is carried out after preheating.
In the present invention, it is preferred to the hot-air seasoning is the hot-air seasoning 5-800 seconds with 40-90 DEG C.
The lithium ion battery separator of the aramid fiber composite coated of the present invention has good mechanical performance and heat-resisting quantity.Together
When, the barrier film has open pore structure, and its wetability to electrolyte is substantially improved.In addition, the preparation method of the present invention
With it is environment-friendly, cost is low, technique is simple, the features such as being easy to continuous production.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention
Embodiment restriction.For those of ordinary skill in the field, can also make on the basis of the above description
Other various forms of changes or variation.Here all embodiments can not be exhaustive.Every skill for belonging to the present invention
Row of the obvious changes or variations that art scheme is extended out still in protection scope of the present invention.
Claims (7)
1. a kind of lithium ion battery separator of aramid fiber composite coated, including lithium ion battery basement membrane and to be coated on the basement membrane unilateral
Or the coating of bilateral, the coating is by aramid fiber composite mortar is coated, water vapour preheats, is obtained after hot-air seasoning, its feature
It is,
The composition and weight ratio of the aramid fiber composite mortar be:
Aramid fiber polymeric compound：5~20%；
Solvent：80~90%；
Adhesive：0~8%.
2. the lithium ion battery separator of aramid fiber composite coated according to claim 1, it is characterised in that the solvent is
One or more in NMP, DMSO, DMF or DMAC.
3. the lithium ion battery separator of aramid fiber composite coated according to claim 2, it is characterised in that the adhesive
For：PVDF or GMA.
4. the lithium ion battery separator of aramid fiber composite coated according to claim 3, it is characterised in that the lithium-ion electric
Pond basement membrane is the polyethylene based film that thickness is 5-40 μm, porosity is 30-60%, polypropylene basement membrane, polypropylene, polyethylene/poly-
Propylene compound substrate membranes, polyimide base film, Kynoar basement membrane, polyethylene nonwoven basement membrane, polypropylene non-woven fabric basement membrane and
One kind in polyimide nonwoven fabric basement membrane.
5. a kind of preparation method of the lithium ion battery separator of the aramid fiber composite coated any one of claim 1-4, its
It is characterised by, comprises the following steps：
（1）, by the weight than aramid fiber polymeric compound and adhesive add in the solvent, virtue is made to being completely dissolved in stirring
Synthetic fibre composite mortar;
（2）, by the aramid fiber composite paste in the lithium ion battery membrane surface through sided corona treatment, coat film is made；
（3）, coat film is carried out to 5-800s preheating by 40-90 DEG C of negative pressure low temperature water vapour, make institute in the process
State aramid fiber composite mortar and phase transfer occurs with adhesive, water vapour is evaporated to gas with solvent in this process, and concentrates back
Receive；
（4）, carry out hot-air seasoning after preheating.
6. preparation method according to claim 5, it is characterised in that the step（4）In hot-air seasoning to use 40-90
DEG C hot-air seasoning 5-800s.
7. preparation method according to claim 6, it is characterised in that the step（2）In coating be intaglio plate coating, narrow
One kind in seam coating, the coating of dip-coating formula or jet printing type coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519368.2A CN107359300B (en) | 2017-06-30 | 2017-06-30 | Aramid composite coated lithium ion battery diaphragm and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519368.2A CN107359300B (en) | 2017-06-30 | 2017-06-30 | Aramid composite coated lithium ion battery diaphragm and preparation method thereof |
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| CN107359300A true CN107359300A (en) | 2017-11-17 |
| CN107359300B CN107359300B (en) | 2020-10-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565379A (en) * | 2018-03-19 | 2018-09-21 | 上海恩捷新材料科技股份有限公司 | A kind of lithium battery diaphragm and preparation method thereof |
| CN109904368A (en) * | 2019-01-24 | 2019-06-18 | 深圳市新非泽科技有限公司 | Aramid fiber coats heat-resisting lithium ion battery separator and preparation method thereof |
| CN110690393A (en) * | 2019-10-17 | 2020-01-14 | 山东精恒科技有限公司 | Preparation method of para-aramid nanofiber/PP non-woven fabric diaphragm |
| CN110838568A (en) * | 2019-11-18 | 2020-02-25 | 高芳 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN112531285A (en) * | 2020-12-21 | 2021-03-19 | 中材锂膜有限公司 | High-temperature-resistant para-aramid coated lithium ion battery diaphragm and preparation method thereof |
| CN118073778A (en) * | 2024-04-19 | 2024-05-24 | 蜂巢能源科技股份有限公司 | Composite diaphragm, preparation method thereof and battery |
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| CN102891275A (en) * | 2011-07-20 | 2013-01-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Modified microporous diaphragm and its preparation method and use |
| CN103242556A (en) * | 2013-04-17 | 2013-08-14 | 广东精进能源有限公司 | Method for preparing aramid composite diaphragm |
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| CN104993089A (en) * | 2015-07-29 | 2015-10-21 | 沧州明珠隔膜科技有限公司 | Aramid coated lithium ion battery diaphragm and preparation method thereof |
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| CN101035927A (en) * | 2004-08-11 | 2007-09-12 | 佛兰芒技术研究所 | Web-reinforced separator and continuous method for producing same |
| CN102891275A (en) * | 2011-07-20 | 2013-01-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Modified microporous diaphragm and its preparation method and use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565379A (en) * | 2018-03-19 | 2018-09-21 | 上海恩捷新材料科技股份有限公司 | A kind of lithium battery diaphragm and preparation method thereof |
| CN109904368A (en) * | 2019-01-24 | 2019-06-18 | 深圳市新非泽科技有限公司 | Aramid fiber coats heat-resisting lithium ion battery separator and preparation method thereof |
| CN109904368B (en) * | 2019-01-24 | 2021-11-23 | 深圳市新非泽科技有限公司 | Aramid fiber coated heat-resistant lithium ion battery diaphragm and preparation method thereof |
| CN110690393A (en) * | 2019-10-17 | 2020-01-14 | 山东精恒科技有限公司 | Preparation method of para-aramid nanofiber/PP non-woven fabric diaphragm |
| CN110838568A (en) * | 2019-11-18 | 2020-02-25 | 高芳 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN112531285A (en) * | 2020-12-21 | 2021-03-19 | 中材锂膜有限公司 | High-temperature-resistant para-aramid coated lithium ion battery diaphragm and preparation method thereof |
| CN112531285B (en) * | 2020-12-21 | 2023-07-07 | 中材锂膜有限公司 | High-temperature-resistant para-aramid coated lithium ion battery diaphragm and preparation method thereof |
| CN118073778A (en) * | 2024-04-19 | 2024-05-24 | 蜂巢能源科技股份有限公司 | Composite diaphragm, preparation method thereof and battery |
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| CN107359300B (en) | 2020-10-30 |
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