CN103579559A - Diaphragm of electrochemical power supply and preparation method thereof - Google Patents
Diaphragm of electrochemical power supply and preparation method thereof Download PDFInfo
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- CN103579559A CN103579559A CN201210266488.3A CN201210266488A CN103579559A CN 103579559 A CN103579559 A CN 103579559A CN 201210266488 A CN201210266488 A CN 201210266488A CN 103579559 A CN103579559 A CN 103579559A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 239000003063 flame retardant Substances 0.000 claims abstract description 44
- 239000000725 suspension Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 17
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 17
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 13
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 8
- 230000004888 barrier function Effects 0.000 claims description 126
- 239000011159 matrix material Substances 0.000 claims description 62
- -1 polyethylene Polymers 0.000 claims description 41
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 40
- 239000004698 Polyethylene Substances 0.000 claims description 24
- 229920000573 polyethylene Polymers 0.000 claims description 24
- 239000010954 inorganic particle Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 20
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000004743 Polypropylene Substances 0.000 claims description 15
- 229920001155 polypropylene Polymers 0.000 claims description 15
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 7
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 5
- 229920002449 FKM Polymers 0.000 claims description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 6
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 9
- 229940068984 polyvinyl alcohol Drugs 0.000 description 8
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 8
- 239000011259 mixed solution Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/52—Separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Laminated Bodies (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of electrochemical power supply, and discloses a diaphragm of an electrochemical power supply and a preparation method thereof. The diaphragm of an electrochemical power supply comprises a diaphragm substrate formed by polyolefin, and a fire-retardant layer which is coated on the diaphragm substrate and contains inorganic powder, wherein the inorganic powder is composed of boehmite and/or aluminium hydroxide. The preparation method comprises the following steps: preparing coating suspension containing the inorganic powder mentioned above, then evenly coating the suspension on two sides of a diaphragm substrate formed by polyolefin, and drying the diaphragm substrate by baking to form a fire-retardant layer on the surface of the diaphragm substrate so as to obtain the diaphragm of electrochemical power supply. The fire-retardant inorganic powder coated on the surface of the diaphragm substrate not only can improve the heat resistant temperature of the diaphragm, but also enables the diaphragm to have a fire-retardant effect, and provides a double safety guarantees for an electrochemical power supply. The diaphragm of an electrochemical power supply has the advantages of simple and practicable preparation technology, low-cost and available raw material, and convenient promotion and application in the field of power supply production.
Description
Technical field
The invention belongs to electrochemical power source technical field, and relate to a kind of barrier film and preparation method thereof of electrochemical power source of high safety performance.
Background technology
Along with the development of human being's production power, increasing running car is in city, streets and lanes, rural.The life of popularizing to people of automobile brings great convenience, but incident problem is also more and more serious.The impact that the consumption of the non-renewable energy resources such as oil is constantly accelerated, the discharge of vehicle exhaust etc. caused to environment all constantly expands.At present, people replace orthodox car in order to address these problems proposition Development of EV.Whether the key that can this imagination be implemented is to have energy density, power density enough large, and cycle life long enough, safe and reliable electrokinetic cell replace internal combustion engine.Wherein, the fail safe of electrokinetic cell is the most important thing.
For example, for electrochemical power source (lithium ion battery and ultracapacitor), thereby typical potential safety hazard is exactly because overcharge, cross and put or short circuit causes the temperature of power supply inside sharply to raise causing burning or blast.The barrier film that electrochemical power source generally adopts is at present porous polyolefin membrane.Because it is polymer, thermal conductivity is very poor, thereby does not possess quick heat radiating performance.Meanwhile, the heat resisting temperature of this polyolefin film is lower, and when reaching heat resisting temperature, this barrier film can shrink even and break.Once membrane ruptures, will be short-circuited between the both positive and negative polarity of electrochemical power source, thereby cause power supply that even blast of burning occurs.On the other hand, because the internal material of existing electrochemical power source does not possess fire resistance, even if barrier film is not damaged, overcharges or cross to put and still may cause occurring burning or blast, general safety performance is low.
Summary of the invention
The technical problem to be solved in the present invention is, heat resisting temperature for the barrier film of electrochemical power source in prior art does not possess fire resistance and causes the defect that electrochemical power source security performance is low compared with low and inside battery material, provides a kind of heat resisting temperature to improve, have flame retardant effect and therefore significantly strengthens barrier film and preparation method thereof of the electrochemical power source of electrochemical power source security performance.
The technical problem to be solved in the present invention is achieved by the following technical programs: a kind of barrier film of electrochemical power source is provided, comprises the barrier film matrix being formed by polyolefin, wherein, described barrier film matrix surface is coated with the flame-retardant layer containing inorganic particle; Described inorganic particle is at least one of boehmite and aluminium hydroxide.
In the barrier film of above-mentioned electrochemical power source, the particle size of described inorganic particle is 3-1000nm.
In the barrier film of above-mentioned electrochemical power source, the thickness of described flame-retardant layer is 5-10 μ m.
In the barrier film of above-mentioned electrochemical power source, the described barrier film matrix being formed by polyolefin is polyethylene barrier film matrix, polypropylene diaphragm matrix, the double-deck barrier film matrix of polyethylene-polypropylene or three layers of barrier film matrix of polyethylene-polypropylene-polyethylene.
According to a further aspect in the invention, provide a kind of preparation method of barrier film of electrochemical power source, wherein, said method comprising the steps of:
S1, to containing adding the inorganic particle with fire retardation in the organic solution of organic binder, after stirring, make coating suspension;
S2, the coating making in step S1 is evenly coated on to the barrier film matrix both sides that formed by polyolefin with suspension; And
S3, the described barrier film matrix through applying in step S2 is carried out to drying and processing, at described barrier film matrix surface, form the flame-retardant layer containing described inorganic particle, make the barrier film of described electrochemical power source.
In the preparation method of the barrier film of above-mentioned electrochemical power source, described step S1 specifically comprises the following steps:
S11, described organic binder is dissolved in organic solvent, stirs and make described organic solution; And
In S12, the organic solution that makes to described step S11, add described inorganic particle, after stirring, make coating suspension.
In the preparation method of the barrier film of above-mentioned electrochemical power source, at least one that described organic binder is following chemical substance: polyvinyl alcohol, polytetrafluoroethylene, Kynoar, modified styrene butadiene rubber (modification SBR), Viton and polyurethane; Described organic solvent is at least one of following chemical substance: carrene, acetone, chloroform, dimethyl formamide, oxolane, 1-METHYLPYRROLIDONE and cyclohexane.
In the preparation method of the barrier film of above-mentioned electrochemical power source, the mass ratio of described organic binder and described organic solvent is 1: 50-1: 10.
In the preparation method of the barrier film of above-mentioned electrochemical power source, described inorganic particle is at least one of boehmite and aluminium hydroxide, and the particle size of described inorganic particle is 3-1000nm.
In the preparation method of the barrier film of above-mentioned electrochemical power source, described inorganic particle and described coating are 1 with the mass ratio of suspension: 20-3: 5.
In the preparation method of the barrier film of above-mentioned electrochemical power source, the described barrier film matrix being formed by polyolefin is polyethylene barrier film matrix, polypropylene diaphragm matrix, the double-deck barrier film matrix of polyethylene-polypropylene or three layers of barrier film matrix of polyethylene-polypropylene-polyethylene.
In the preparation method of the barrier film of above-mentioned electrochemical power source, in described step S2, one or more that the mode of described coating is following mode: immersion coating, scraper apply, scraper applies and spraying.
In the preparation method of the barrier film of above-mentioned electrochemical power source, in described step S3, described drying and processing refers at the temperature of 40～130 ℃, and the described barrier film matrix through applying is placed in by one or more dry gas that form of hydrogen, nitrogen and inert gas or the described barrier film matrix through applying is placed in to dry air or vacuum is dried
Implement the present invention and can obtain following beneficial effect: in the present invention, barrier film matrix surface is coated with the inorganic particle of tool flame retardant effect, it can improve the skeleton structure of the barrier film finally making, thereby reduce the heat resisting temperature of the shrinkage raising barrier film under its high temperature, and therefore improve the ability of the barrier film antagonism power supply internal high temperature of electrochemical power source of the present invention; The inorganic particle adopting has flame retardant effect, therefore can give power supply internal material certain flame-retarding characteristic, for electrochemical power source provides dual safety guarantee.The barrier film with the electrochemical power source of flame-retardant layer provided by the present invention can adopt the preparation of traditional coating processes, and technique is simple and be easy to realize; The coating cost of material that adopts is low and be easy to obtain, and is convenient to manufacture at power supply the promotion and implementation in field; The electrochemical power source security performance with above-mentioned barrier film is high, and application prospect is extensive.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of barrier film of electrochemical power source of new structure.The barrier film of this electrochemical power source is owing to having applied boehmite and/or the aluminium hydroxide with flame retardant effect, make its heat resisting temperature improve (preferably improving 20-30 ℃), and the electrochemical power source that makes to have this barrier film obtains flame retardant effect simultaneously, thereby provide dual safety guarantee for electrochemical power source.On the other hand, because barrier film of the present invention is the structure of barrier film matrix+flame-retardant layer, can guarantee required barrier film intensity, this and its in the concrete application of field of electrochemical power source, match.
Electrochemical power source involved in the present invention includes but not limited to lithium ion battery and ultracapacitor.In other words, the barrier film of electrochemical power source of the present invention can be applicable to lithium ion battery and ultracapacitor.
Below in conjunction with specific embodiment, the barrier film of electrochemical power source of the present invention is further explained in detail.
Embodiment 1:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the aluminium hydroxide powder that wherein this flame-retardant layer is 500nm by polytetrafluoroethylene and particle size forms, and the thickness of this flame-retardant layer is 7 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
The acetone that accurately takes 100g is placed in container, to the polytetrafluoroethylene that adds 10g in acetone, stirs until form uniform polytetrafluoroethylene acetone soln; To adding 10g particle size in above-mentioned polytetrafluoroethylene acetone soln, be the aluminium hydroxide powder of 500nm, after stirring, obtain coating suspension; The barrier film matrix being formed by polyethylene is immersed in to above-mentioned coating with in suspension, after standing 30 minutes, at the uniform velocity mentions; The mobile drying nitrogen that the polyethylene barrier film matrix that is coated with suspension is placed in to 100 ℃ is dried 12 hours, makes the barrier film of described electrochemical power source.
Embodiment 2:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the boehmite powder that wherein this flame-retardant layer is 500nm by polytetrafluoroethylene and particle size forms, and the thickness of this flame-retardant layer is 7 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
The acetone that accurately takes 100g is placed in container, to the polytetrafluoroethylene that adds 10g in acetone, stirs until form uniform polytetrafluoroethylene acetone soln; To adding 10g particle size in above-mentioned polytetrafluoroethylene acetone soln, be the boehmite powder of 500nm, after stirring, obtain coating suspension; The barrier film matrix being formed by polyethylene is immersed in to above-mentioned coating with in suspension, after standing 30 minutes, at the uniform velocity mentions; The mobile drying nitrogen that the polyethylene barrier film matrix that is coated with suspension is placed in to 80 ℃ is dried 12 hours, makes the barrier film of described electrochemical power source.
Embodiment 3:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polypropylene and the flame-retardant layer that is coated in this barrier film matrix surface, boehmite powder and aluminium hydroxide powder that wherein this flame-retardant layer is 500nm by polyvinyl alcohol and particle size form, and the thickness of this flame-retardant layer is 8 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
Accurately take 50g chloroform and 50g acetone is placed in container, the polyvinyl alcohol to adding 2g in the mixed solution of chloroform and acetone, stirs until form uniform poly-vinyl alcohol solution; To adding 5g particle size in above-mentioned poly-vinyl alcohol solution, be the boehmite powder of 500nm and the aluminium hydroxide powder that 5g particle size is 500nm, after stirring, obtain coating suspension; At the barrier film matrix surface being formed by polypropylene, adopt scraper evenly to apply above-mentioned coating with in suspension, applied latter standing 10 minutes; The mobile dry helium gas that the polypropylene diaphragm matrix that is coated with suspension is placed in to 40 ℃ is dried 12 hours, makes the barrier film of described electrochemical power source.
Embodiment 4:
A kind of barrier film of electrochemical power source, comprise the double-deck barrier film matrix being formed successively by polyethylene and polypropylene and the flame-retardant layer that is coated in this barrier film matrix surface, the aluminium hydroxide powder that wherein this flame-retardant layer is 3nm by Kynoar and Viton and particle size forms, and the thickness of this flame-retardant layer is 5 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
Accurately take 90g dimethyl formamide and be placed in container, in dimethyl formamide, add 2.5g Kynoar and 2.5g Viton, stir until form the mixed solution of uniform Kynoar and Viton; To adding 5g particle size in above-mentioned mixed solution, be the aluminium hydroxide powder of 3nm, after stirring, obtain coating suspension; At the double-deck barrier film matrix surface being formed successively by polyethylene and polypropylene, adopt scraper evenly to apply above-mentioned coating with in suspension, applied latter standing 10 minutes; The dry air that the double-deck barrier film matrix of the polyethylene-polypropylene that is coated with suspension is placed in to 60 ℃ is dried 12 hours, makes the barrier film of described electrochemical power source.
Embodiment 5:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the aluminium hydroxide powder that wherein this flame-retardant layer is 1000nm by modified styrene butadiene rubber and particle size forms, and the thickness of this flame-retardant layer is 10 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
Accurately take 20g cyclohexane and 18g 1-METHYLPYRROLIDONE is placed in container, in the mixed solution of cyclohexane and 1-METHYLPYRROLIDONE, add 2g modified styrene butadiene rubber, stir until form uniform modified styrene butadiene rubber solution; To adding 60g particle size in above-mentioned modified styrene butadiene rubber solution, be the aluminium hydroxide powder of 1000nm, after stirring, obtain coating suspension; The barrier film matrix being formed by polyethylene is immersed in to above-mentioned coating with in suspension, after standing 30 minutes, at the uniform velocity mentions, at the barrier film matrix surface that is coated with suspension, adopt scraper to make the further homogenizing of suspension applying subsequently; Next the polyethylene barrier film matrix that is coated with suspension is placed in to the hydrogen of 130 ℃ and the combination drying gas of helium and dries 12 hours, make the barrier film of described electrochemical power source.
Embodiment 6:
A kind of barrier film of electrochemical power source, comprise three layers of barrier film matrix that formed successively by polyethylene, polypropylene and polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the boehmite powder that wherein this flame-retardant layer is 500nm by polyurethane and particle size forms, and the thickness of this flame-retardant layer is 7 μ m.The preparation process of the barrier film of this electrochemical power source is as follows:
Accurately take 50g carrene and 50g oxolane is placed in container, the polyurethane to adding 10g in the mixed solution of carrene and oxolane, stirs until form uniform polyurethane solutions; To adding 10g particle size in above-mentioned polyurethane solutions, be the boehmite powder of 500nm, after stirring, obtain coating suspension; To three layers of barrier film matrix surface that formed successively by polyethylene, polypropylene and polyethylene, evenly spray above-mentioned coating with in suspension, sprayed latter standing 10 minutes; The vacuum environment that subsequently the three layers of barrier film matrix of polyethylene-polypropylene-polyethylene that are coated with suspension is placed in to 80 ℃ is dried 12 hours, makes the barrier film of described electrochemical power source.
Embodiment 7:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the aluminium hydroxide powder that wherein this flame-retardant layer is 500nm by polyvinyl alcohol and particle size forms, and the thickness of this flame-retardant layer is 7 μ m.The organic solvent that the preparation process of the barrier film of this electrochemical power source adopts is cyclohexane, and other preparation process are with embodiment 1.
Embodiment 8:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polypropylene and the flame-retardant layer that is coated in this barrier film matrix surface, boehmite powder and aluminium hydroxide powder that wherein this flame-retardant layer is 500nm by polyvinyl alcohol and particle size form, and the thickness of this flame-retardant layer is 8 μ m.The organic solvent that the preparation process of the barrier film of this electrochemical power source adopts is acetone and carrene, and other preparation process are with embodiment 3.
Embodiment 9:
A kind of barrier film of electrochemical power source, comprise the barrier film matrix being formed by polyethylene and the flame-retardant layer that is coated in this barrier film matrix surface, the aluminium hydroxide powder that wherein this flame-retardant layer is 500nm by polyvinyl alcohol and particle size forms, and the thickness of this flame-retardant layer is 7 μ m.The organic solvent that the preparation process of the barrier film of this electrochemical power source adopts is 1-METHYLPYRROLIDONE, and other preparation process are with embodiment 1.
The foregoing is only the preferred embodiments of the present invention, not in order to limit the present invention, all any modifications of doing in the spirit and principles in the present invention, be equal to and replace or improvement etc., all should be included in protection scope of the present invention.
Claims (10)
1. a barrier film for electrochemical power source, comprises the barrier film matrix being formed by polyolefin, it is characterized in that, described barrier film matrix surface is coated with the flame-retardant layer containing inorganic particle; Described inorganic particle is at least one of boehmite and aluminium hydroxide.
2. the barrier film of electrochemical power source according to claim 1, is characterized in that, the particle size of described inorganic particle is 3 ~ 1000nm.
3. the barrier film of electrochemical power source according to claim 1, is characterized in that, the thickness of described flame-retardant layer is 5 ~ 10 μ m.
4. according to the barrier film of the electrochemical power source described in arbitrary claim in claims 1 to 3, it is characterized in that, the described barrier film matrix being formed by polyolefin is polyethylene barrier film matrix, polypropylene diaphragm matrix, the double-deck barrier film matrix of polyethylene-polypropylene or three layers of barrier film matrix of polyethylene-polypropylene-polyethylene.
5. a preparation method for the barrier film of electrochemical power source, is characterized in that, said method comprising the steps of:
S1, to containing adding the inorganic particle with fire retardation in the organic solution of organic binder, after stirring, make coating suspension;
S2, the coating making in step S1 is evenly coated on to the barrier film matrix both sides that formed by polyolefin with suspension; And
S3, the described barrier film matrix through applying in step S2 is carried out to drying and processing, at described barrier film matrix surface, form the flame-retardant layer containing described inorganic particle, make the barrier film of described electrochemical power source.
6. the preparation method of the barrier film of electrochemical power source according to claim 5, is characterized in that, described step S1 specifically comprises the following steps:
S11, described organic binder is dissolved in organic solvent, stirs and make described organic solution; And
In S12, the organic solution that makes to described step S11, add described inorganic particle, after stirring, make described coating suspension.
7. the preparation method of the barrier film of electrochemical power source according to claim 6, it is characterized in that at least one that described organic binder is following chemical substance: polyvinyl alcohol, polytetrafluoroethylene, Kynoar, modified styrene butadiene rubber, Viton and polyurethane; Described organic solvent is at least one of following chemical substance: carrene, acetone, chloroform, dimethyl formamide, oxolane, 1-METHYLPYRROLIDONE and cyclohexane.
8. according to the preparation method of the barrier film of the electrochemical power source described in claim 5 or 6, it is characterized in that, described inorganic particle is at least one of boehmite and aluminium hydroxide, and the particle size of described inorganic particle is 3 ~ 1000nm.
9. according to the preparation method of the barrier film of the electrochemical power source described in claim 5 or 6, it is characterized in that, described inorganic particle and described coating are 1:20 ~ 3:5 with the mass ratio of suspension.
10. according to the preparation method of the barrier film of the electrochemical power source described in claim 5 or 6, it is characterized in that, in described step S3, described drying and processing refers at the temperature of 40 ~ 130 ℃, and the described barrier film matrix through applying is placed in by one or more dry gas that form of hydrogen, nitrogen and inert gas or the described barrier film matrix through applying is placed in to dry air or vacuum is dried.
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