CN104505483A - Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm - Google Patents
Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm Download PDFInfo
- Publication number
- CN104505483A CN104505483A CN201410551220.3A CN201410551220A CN104505483A CN 104505483 A CN104505483 A CN 104505483A CN 201410551220 A CN201410551220 A CN 201410551220A CN 104505483 A CN104505483 A CN 104505483A
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- China
- Prior art keywords
- composite diaphragm
- nonwoven fabrics
- woven fabric
- macromolecular material
- lithium ion
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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
- H01M50/409—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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- 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)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention relates to the technical field of lithium ion batteries and especially relates to a non-woven fabric polymer composite diaphragm and a lithium ion battery containing the non-woven fabric polymer composite diaphragm. The non-woven fabric polymer composite diaphragm comprises a base and a polymer coating the surface of the base. The base is prepared from a non-woven fabric and the polymer coating is a particle coating with particle sizes of 0.1-10 microns. The non-woven fabric polymer composite diaphragm has high temperature resistance. The polymer microporous membrane has good liquid absorbency and can adsorb enough electrolyte in a cell full-life stage so that cell cycle performances are improved.
Description
Technical field
The present invention relates to technical field of lithium ion, be specifically related to a kind of nonwoven fabrics macromolecular material composite diaphragm and apply the lithium ion battery of this barrier film.
Background technology
The advantages such as lithium ion battery has compared with the battery of the other types such as plumbic acid, cadmium nickel that specific capacity is large, operating voltage is high, charging rate is fast, operating temperature range is wide, has extended cycle life, volume is little, lightweight, green non-pollution.At present, the fields such as mobile phone, notebook computer, electric tool are widely used in, and its range of application is more and more extensive, the fast development of novel digital electronic product is to propose more and more higher requirement to the energy density of lithium ion battery and high reliability, the present invention produces just in this context, proposes a kind of composite diaphragm material improving battery safety.
Current commercial lithium ion battery separator mostly is employing polypropylene, apertured polymeric film prepared by polyethylene material, this barrier film effectively can play the effect of ionic conduction and isolated electronics at inside battery, it is the barrier of protection battery safety, macromolecular material has excellent pore-creating character, tensile properties and intensity are all applicable to our existing Product Process, but unfortunately at high temperature can there is contraction in various degree in macromolecular material, with traditional polypropylene, polyethylene material is example, when temperature is more than 100 degrees Celsius, obvious thermal contraction situation can be there is, both positive and negative polarity active material will be caused directly to contact at inside battery, cause safety problem, porous membranes absorbent is poor simultaneously, the electrolyte that the life-cycle stage adsorption of battery is enough can not be remained on, cause cycle performance of battery poor, in the case, there is again the high temperature resistance diaphragm adopting the materials such as fibrous nonwoven cloth to prepare, but this type of barrier film pore-creating is uneven, battery self discharge rate is high, puncture strength is poor, resistance to tensile strength is low, be easy under high tension bore deformation occurs, poor processability brings other potential safety hazard equally.
Summary of the invention
The object of the invention is to solve the problem, a kind of nonwoven fabrics macromolecular material composite diaphragm being provided and applying the lithium ion battery of this barrier film.Composite diaphragm of the present invention with porous fibre nonwoven fabrics material for base material, one deck macromolecular material is applied again at substrate surface by infiltration or surface printing process, effectively combine the advantage of two kinds of materials, make a kind of good heat resistance, intensity be high, composite wood plasma membrane that good processability, absorbent are excellent.
In order to reach foregoing invention object, the present invention by the following technical solutions:
A kind of nonwoven fabrics macromolecular material composite diaphragm, comprise base material and the polymer material layer being coated in substrate surface, base material is nonwoven fabrics, polymer material layer to be particle diameter the be grain coating of 0.1-10 μm, this composite diaphragm is prepared from by following steps, choose the graininess macromolecular material that particle diameter is 0.1-10 μm, macromolecule material particle is toasted 8 hours under the vacuum state of 100 DEG C, then the macromolecule material particle after baking is dissolved in alcohol organic solvent of ketone, high speed dispersion, form slurries, then anilox roll coating or pattern of invasion is adopted by these slurries to be uniformly coated on the surface of base material, through baking oven baking, solvent composition is dried again after coating, obtain macromolecule nonwoven cloth material composite diaphragm.
Take nonwoven fabrics as base material, at nonwoven surface coating polymeric particles, thus can form the barrier film with uniform micro, the performance of this barrier film to battery plays good effect.
As preferably, described base material thickness is 10-40 μm, and the thickness of polymer material layer is 1-5 μm.
As preferably, described macromolecular material is Kynoar.Kynoar has good iris action to electronics, can effective screening electron.
As preferably, described nonwoven fabrics is the nonwoven fabrics that cellulose fibre is prepared from.Nonwoven fabrics prepared by cellulose fibre has better adhesive force to macromolecule, and polymeric particles can be prevented to be separated with nonwoven fabrics.
As preferably, according to mass ratio 1:99, macromolecular material is dissolved in solvent.
As preferably, described solvent is acetone.
A kind of lithium ion battery, the barrier film of described lithium ion battery adopts above-mentioned composite diaphragm.
The nonwoven fabrics that the base material of this composite diaphragm adopts resistant to elevated temperatures cellulose fibre to prepare, there is porous fibrous structure, can keep stable at 200 DEG C of temperature, there is not obvious deformation, one deck high-molecular organic material is applied at substrate surface, Kynoar etc., at high temperature baking forms uniform and stable porous membrane structure, form nonwoven fabrics macromolecular material composite diaphragm, substrate fiber shape non-woven membrane mainly plays the effect of skeletal support, prevent barrier film from occurring by thermal deformation, and macromolecule membranous layer mainly improves the surface state of non-woven membrane, prevent battery micro-short circuit situation from occurring, increase the puncture strength of fibrous septa, play the effect improving battery performance.
Compared with prior art, beneficial effect is in the present invention:
1 is high temperature resistant, can keep stable when temperature is more than 200 degrees Celsius,
2 porous membranes absorbents are good, can remain on the electrolyte that the life-cycle stage adsorption of battery is enough, improve the cycle performance of battery,
3 barrier film pore-creating are evenly distributed, and battery self discharge rate is low, and puncture strength is good, and resistance to tensile strength is high, under high tension bore deformation is less likely to occur, and reduces potential safety hazard.
Accompanying drawing explanation
Fig. 1 is the structural representation of nonwoven fabrics macromolecular material composite diaphragm of the present invention.
In figure: 1 base material, 2 polymer material layers.
Embodiment
Below by specific embodiment, explanation is further described to technical scheme of the present invention.
If without specified otherwise, the raw material adopted in embodiments of the invention is the conventional raw material in this area, and the method adopted in embodiment, is the conventional method of this area.
Embodiment 1:
A kind of nonwoven fabrics macromolecular material composite diaphragm, comprise base material and the polymer material layer being coated in substrate surface, base material to be thickness the be nonwoven fabrics of 10 μm, nonwoven fabrics is nonwoven fabrics polymer material layer that cellulose fibre is prepared to be particle diameter the be thickness of 10 μm the is grain coating of 1 μm, this composite diaphragm is prepared from by following steps, choose the graininess macromolecular material that particle diameter is 10 μm, macromolecule material particle is toasted 8 hours under the vacuum state of 100 DEG C, then the macromolecule material particle after baking will be dissolved in acetone according to mass ratio 1:99, high speed dispersion, form slurries, then anilox roll coating or pattern of invasion is adopted by these slurries to be uniformly coated on the surface of base material, through baking oven baking, solvent composition is dried again after coating, obtain macromolecule nonwoven cloth material composite diaphragm.
This composite diaphragm is prepared into lithium ion battery, positive electrode is cobalt acid lithium, negative pole is graphite, electrolyte adopts the solution (solvent is ethyl carbonate) of 1.0mol/L lithium hexafluoro phosphate, battery packaging technology and this patent content have nothing to do, do not repeat at this, test after assembling, checking membrane properties.
Embodiment 2:
A kind of nonwoven fabrics macromolecular material composite diaphragm, comprise base material and the polymer material layer being coated in substrate surface, base material to be thickness the be nonwoven fabrics of 40 μm, nonwoven fabrics is nonwoven fabrics polymer material layer that cellulose fibre is prepared to be particle diameter the be thickness of 0.1 μm the is grain coating of 5 μm, this composite diaphragm is prepared from by following steps, choose the graininess macromolecular material that particle diameter is 0.1, macromolecule material particle is toasted 8 hours under the vacuum state of 100 DEG C, then the macromolecule material particle after baking will be dissolved in acetone according to mass ratio 1:99, high speed dispersion, form slurries, then anilox roll coating or pattern of invasion is adopted by these slurries to be uniformly coated on the surface of base material, through baking oven baking, solvent composition is dried again after coating, obtain macromolecule nonwoven cloth material composite diaphragm.
This composite diaphragm is prepared into lithium ion battery, positive electrode is cobalt acid lithium, negative pole is graphite, electrolyte adopts the solution (solvent is ethyl carbonate) of 1.0mol/L lithium hexafluoro phosphate, battery packaging technology and this patent content have nothing to do, do not repeat at this, test after assembling, checking membrane properties.
After testing, the barrier property of this composite diaphragm is good, compound actual mass standard.
Claims (7)
1. a nonwoven fabrics macromolecular material composite diaphragm, it is characterized in that, comprise base material and the polymer material layer being coated in substrate surface, base material is nonwoven fabrics, polymer material layer to be particle diameter the be grain coating of 0.1-10 μm, this composite diaphragm is prepared from by following steps, choose the graininess macromolecular material that particle diameter is 0.1-10 μm, macromolecule material particle is toasted 8 hours under the vacuum state of 100 DEG C, then the macromolecule material particle after baking is dissolved in alcohol organic solvent of ketone, high speed dispersion, form slurries, then anilox roll coating or pattern of invasion is adopted by these slurries to be uniformly coated on the surface of base material, through baking oven baking, solvent composition is dried again after coating, obtain macromolecule nonwoven cloth material composite diaphragm.
2. a kind of nonwoven fabrics macromolecular material composite diaphragm according to claim 1, it is characterized in that, described base material thickness is 10-40 μm, and the thickness of polymer material layer is 1-5 μm.
3. nonwoven fabrics macromolecular material composite diaphragm according to claim 1, is characterized in that, described macromolecular material is Kynoar.
4. nonwoven fabrics macromolecular material composite diaphragm according to claim 1, is characterized in that, be dissolved in solvent by macromolecular material according to mass ratio 1:99.
5. nonwoven fabrics macromolecular material composite diaphragm according to claim 1, is characterized in that, described nonwoven fabrics is the nonwoven fabrics that cellulose fibre is prepared from.
6. nonwoven fabrics macromolecular material composite diaphragm according to claim 1, is characterized in that, described solvent is acetone.
7. a lithium ion battery, is characterized in that, the barrier film of described lithium ion battery adopts composite diaphragm according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410551220.3A CN104505483B (en) | 2014-10-16 | 2014-10-16 | Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410551220.3A CN104505483B (en) | 2014-10-16 | 2014-10-16 | Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm |
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| Publication Number | Publication Date |
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| CN104505483A true CN104505483A (en) | 2015-04-08 |
| CN104505483B CN104505483B (en) | 2017-01-18 |
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| CN201410551220.3A Active CN104505483B (en) | 2014-10-16 | 2014-10-16 | Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129311A (en) * | 2016-08-31 | 2016-11-16 | 合肥国轩高科动力能源有限公司 | Preparation method of lithium ion battery diaphragm material |
| CN109403064A (en) * | 2018-11-08 | 2019-03-01 | 广东协宏无纺布科技有限公司 | A kind of agricultural anti-careless, anti-aging non-woven fabrics |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157750A (en) * | 2011-03-07 | 2011-08-17 | 湖南丰源业翔晶科新能源股份有限公司 | Secondary lithium-ion battery and preparation method thereof |
| CN103441230A (en) * | 2013-08-21 | 2013-12-11 | 东莞新能源科技有限公司 | Organic/inorganic composite porous isolating membrane, preparation method thereof and electrochemical device |
| CN103579553A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
-
2014
- 2014-10-16 CN CN201410551220.3A patent/CN104505483B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157750A (en) * | 2011-03-07 | 2011-08-17 | 湖南丰源业翔晶科新能源股份有限公司 | Secondary lithium-ion battery and preparation method thereof |
| CN103579553A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN103441230A (en) * | 2013-08-21 | 2013-12-11 | 东莞新能源科技有限公司 | Organic/inorganic composite porous isolating membrane, preparation method thereof and electrochemical device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129311A (en) * | 2016-08-31 | 2016-11-16 | 合肥国轩高科动力能源有限公司 | Preparation method of lithium ion battery diaphragm material |
| CN106129311B (en) * | 2016-08-31 | 2019-04-19 | 合肥国轩高科动力能源有限公司 | Preparation method of lithium ion battery diaphragm material |
| CN109403064A (en) * | 2018-11-08 | 2019-03-01 | 广东协宏无纺布科技有限公司 | A kind of agricultural anti-careless, anti-aging non-woven fabrics |
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| Publication number | Publication date |
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| CN104505483B (en) | 2017-01-18 |
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Address after: 315800 standard workshop No. 2 of the 0212 massif in the West Zone of the Ningbo Free Trade Zone, Zhejiang Patentee after: Ningbo Veken Battery Co., Ltd. Address before: 315800 No. 5 West Avenue, Beilun Free Trade Zone, Ningbo, Zhejiang Patentee before: Ningbo Veken Battery Co., Ltd. |
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