CN102891273A - Shrink-resisting lithium ion battery modified diaphragm and preparation method thereof - Google Patents
Shrink-resisting lithium ion battery modified diaphragm and preparation method thereof Download PDFInfo
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- CN102891273A CN102891273A CN2011102053813A CN201110205381A CN102891273A CN 102891273 A CN102891273 A CN 102891273A CN 2011102053813 A CN2011102053813 A CN 2011102053813A CN 201110205381 A CN201110205381 A CN 201110205381A CN 102891273 A CN102891273 A CN 102891273A
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- diaphragm
- lithium ion
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- ion battery
- modified diaphragm
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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
The invention relates to a shrink-resisting lithium ion battery modified diaphragm and a preparation method thereof and mainly solves the problem that the existing diaphragm is serious in high-temperature shrink. The preparation method comprises the following steps of: dissolving copolymer resin of vinylidene fluoride and trifluorochloroethylene in a solvent to prepare a glue solution, wherein the concentration of the glue solution is controlled to a weight ratio of 1-10%; coating the glue solution on the surface of the existing diaphragm through air spraying or airless spraying; performing low-temperature roasting at 40-80 DEG C to ensure that the glue solution is dried to form a high-temperature coating on the surface of the diaphragm; and controlling the thickness of the coated dried film to obtain the modified diaphragm with satisfactory performance. According to the invention, the modified diaphragm can be prepared through a common spraying technology, has the characteristics of high-temperature hole closing performance and high-temperature shrink resistance, and keeps the performance of the diaphragm consistent; and the ion conduction performance can meet the requirements of lithium ion power batteries for high-power discharge.
Description
Technical field
The invention belongs to lithium ion battery separator modification field, be specifically related to use vinylidene and chlorotrifluoroethylene modification now to use battery diaphragm.
Background technology
The barrier film of at present lithium-ion-power cell use just has significant contraction about 120 ℃, contraction can cause the distortion of battery, scraps.Serious can cause also that directly contact short circuit is on fire between pole piece.Producing the expectation of high-power lithium ion power battery enterprise has the higher barrier film of a kind of heatproof to occur, and solves the problem that the excess Temperature barrier film shrinks in the battery use.
Head it off has two kinds of thinkings: a kind of is to change existing septate constituent to use the material substitution of anti-higher temperature now to use the polyethylene polypropylene composite film, and the method can fundamentally solve barrier film and shrink problem, but the construction cycle is very long, and cost is huge; Another kind method is by existing diagram modification being improved its heat resistance, need to take into account its ion guide general character and high temperature closed pore performance to diagram modification, thus modified resin select most important.To existing diagram modification, method is relatively simple, and effect is remarkable, and cost is in tolerance interval.
Summary of the invention
The object of the invention is to overcome now provides a kind of have high temperature closed pore and high temperature anti-contracility with the high-temperature shrinkage defective of barrier film, and the ion guide general character can satisfy the anti-contraction lithium ion battery modified diaphragm of lithium-ion-power cell high power discharge requirement.
The present invention also aims to provide the preparation method of above-mentioned anti-contraction lithium ion battery modified diaphragm.
Technical solution of the present invention is: in the existing copolymer resin formation high-temperaure coating that applies vinylidene and chlorotrifluoroethylene with membrane surface, 200 ℃ of long-term serviceability temperatures, 250 ℃ of short-term serviceability temperatures.
Described is the used PP-PE-PP(polyethylene-polypropylene of lithium ion battery-polyethylene with barrier film now) three layers of barrier film.
The preparation method of anti-contraction lithium ion battery modified diaphragm of the present invention is: the copolymer resin of vinylidene and chlorotrifluoroethylene is dissolved in solvent makes glue, described gelatin concentration is controlled at weight ratio 1%-10%, adopts aerial spraying or airless spraying at the existing membrane surface of using glue; Adopt 40 ~ 80 degrees centigrade of low-temperature bakes making glue form high-temperaure coating existing with the membrane surface drying.
Described high-temperaure coating build is controlled at 1 micron-10 microns.
Solvent of the present invention is selected acetone or ethyl acetate.
The present invention chooses the copolymer resin of a kind of satisfactory vinylidene and chlorotrifluoroethylene, is dissolved in and configures glue in the solvent, forms uniform heatproof coating on the barrier film by glue is sprayed to, to reach the effect to diagram modification.
Resin described in the technology of the present invention solution is selected existing trade names F2311, this trade mark is to be formed by 1:1 random copolymerization by vinylidene (VDF) and chlorotrifluoroethylene (CTFE), milky and amber translucent elastomer, nontoxic, odorless, nonflammable, chlorinity between 19.1%-20.2%, molecular weight 50-100 ten thousand, decomposition temperature is 300 ℃-310 ℃, anti-aromatic hydrocarbon solvent dissolves in the organic solvents such as ethyl acetate, acetone, carbon tetrachloride.The F2311 Random copolymer RCP has outstanding powerful oxidation corrosion resistance and severe corrosive, good thermal endurance (200 ℃ of long-term serviceability temperatures, 250 ℃ of short-term serviceability temperatures), the good characteristics such as low water absorbable.
The made modified diaphragm of the present invention is through the experimental verification ion guide general character, and the requirement of lithium-ion-power cell high power discharge is all satisfied in the anti-contraction of high temperature closed pore and high temperature, has the common spraying technology of employing and can make and can keep the consistent characteristics of membrane properties.
Embodiment
The F2311 resin dissolves is configured to uniform glue in acetone, concentration is weight ratio 5%, by spray gun glue is uniformly sprayed at the existing membrane surface of using, form and to film uniformly, will be through the barrier film of coating by the oven for solidifying of the proper temperature recovery acetone of filming.The spray gun walking speed was controlled when coating layer thickness can and spray by the adjusting gelatin concentration.1-10 microns suitable coating layer thicknesses are determining the serviceability of modified diaphragm.
Claims (4)
1. an anti-contraction lithium ion battery modified diaphragm is characterized in that: the copolymer resin formation high-temperaure coating that applies vinylidene and chlorotrifluoroethylene at membrane surface.
2. the preparation method of an anti-contraction lithium ion battery modified diaphragm claimed in claim 1, it is characterized in that: the copolymer resin of vinylidene and chlorotrifluoroethylene is dissolved in solvent makes glue, described gelatin concentration is controlled at weight ratio 1%-10%, adopts aerial spraying or airless spraying at membrane surface glue; Adopt 40 ~ 80 degrees centigrade of low-temperature bakes to make glue at the dry high-temperaure coating that forms of membrane surface.
3. the preparation method of anti-contraction lithium ion battery modified diaphragm according to claim 2, it is characterized in that: described high-temperaure coating build is controlled at 1 micron-10 microns.
4. the preparation method of anti-contraction lithium ion battery modified diaphragm according to claim 3, it is characterized in that: described solvent is acetone or ethyl acetate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110205381.3A CN102891273B (en) | 2011-07-21 | 2011-07-21 | A kind of resisted shrinkage lithium ion battery modified diaphragm and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110205381.3A CN102891273B (en) | 2011-07-21 | 2011-07-21 | A kind of resisted shrinkage lithium ion battery modified diaphragm and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102891273A true CN102891273A (en) | 2013-01-23 |
| CN102891273B CN102891273B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110205381.3A Active CN102891273B (en) | 2011-07-21 | 2011-07-21 | A kind of resisted shrinkage lithium ion battery modified diaphragm and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112042039A (en) * | 2019-02-21 | 2020-12-04 | 株式会社Lg化学 | Electrode assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1372706A (en) * | 2000-03-07 | 2002-10-02 | 帝人株式会社 | Lithium ion secondary cell, separation, cell back, and charging method |
| CN1685540A (en) * | 2002-09-27 | 2005-10-19 | 荷兰应用科学研究会(Tno) | Rechargeable lithium battery |
| CN101088595A (en) * | 2007-07-11 | 2007-12-19 | 湖北工业大学 | Process of preparing plate porous membrane with high permeating flux |
| CN102035043A (en) * | 2009-09-25 | 2011-04-27 | 上海比亚迪有限公司 | Polymer porous membrane, preparation method thereof, polymer electrolyte, polymer battery and preparation method of battery |
-
2011
- 2011-07-21 CN CN201110205381.3A patent/CN102891273B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1372706A (en) * | 2000-03-07 | 2002-10-02 | 帝人株式会社 | Lithium ion secondary cell, separation, cell back, and charging method |
| CN1685540A (en) * | 2002-09-27 | 2005-10-19 | 荷兰应用科学研究会(Tno) | Rechargeable lithium battery |
| US20060134525A1 (en) * | 2002-09-27 | 2006-06-22 | Christian Kleijnen | Rechargeable lithium battery |
| CN101088595A (en) * | 2007-07-11 | 2007-12-19 | 湖北工业大学 | Process of preparing plate porous membrane with high permeating flux |
| CN102035043A (en) * | 2009-09-25 | 2011-04-27 | 上海比亚迪有限公司 | Polymer porous membrane, preparation method thereof, polymer electrolyte, polymer battery and preparation method of battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112042039A (en) * | 2019-02-21 | 2020-12-04 | 株式会社Lg化学 | Electrode assembly |
| CN112042039B (en) * | 2019-02-21 | 2024-02-20 | 株式会社Lg新能源 | Electrode assembly and secondary battery including the same |
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| Publication number | Publication date |
|---|---|
| CN102891273B (en) | 2016-06-08 |
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