WO2004091014A1 - 電池用セパレータのための接着剤担多孔質フィルムとその利用 - Google Patents
電池用セパレータのための接着剤担多孔質フィルムとその利用 Download PDFInfo
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- WO2004091014A1 WO2004091014A1 PCT/JP2004/004801 JP2004004801W WO2004091014A1 WO 2004091014 A1 WO2004091014 A1 WO 2004091014A1 JP 2004004801 W JP2004004801 W JP 2004004801W WO 2004091014 A1 WO2004091014 A1 WO 2004091014A1
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- Prior art keywords
- porous film
- electrode
- adhesive
- battery
- weight
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- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- AHAREKHAZNPPMI-UHFFFAOYSA-N hexa-1,3-diene Chemical compound CCC=CC=C AHAREKHAZNPPMI-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 125000000654 isopropylidene group Chemical group C(C)(C)=* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- DNPFOADIPJWGQH-UHFFFAOYSA-N octan-3-yl prop-2-enoate Chemical compound CCCCCC(CC)OC(=O)C=C DNPFOADIPJWGQH-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- PNGLEYLFMHGIQO-UHFFFAOYSA-M sodium;3-(n-ethyl-3-methoxyanilino)-2-hydroxypropane-1-sulfonate;dihydrate Chemical compound O.O.[Na+].[O-]S(=O)(=O)CC(O)CN(CC)C1=CC=CC(OC)=C1 PNGLEYLFMHGIQO-UHFFFAOYSA-M 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003866 tertiary ammonium salts Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture 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
-
- 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
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
-
- 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
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- 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
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- 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
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/2896—Adhesive compositions including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.]
Definitions
- the present invention is useful for manufacturing batteries, and in such manufactured batteries, even under a high-temperature environment, does not melt or break, and functions as a separator with small heat shrinkage.
- the present invention relates to an adhesive-supporting porous film for a battery separator having excellent properties, and a method for producing a battery using such an adhesive-supporting porous film.
- a separator is interposed between these electrodes to prevent a short circuit between them, or a positive (negative) pole, a separator, a negative (positive) pole and a separator are laminated in this order, and then wound,
- a method of forming an electrode / separator laminate charging the electrode / separator laminate in a battery container, injecting an electrolytic solution into the battery container, and sealing the battery container.
- the electrode and the separator are liable to shift with each other during storage and transport of the electrode / separator / laminated laminate. As a result, the productivity of battery manufacture is low, and However, there are problems that defective products are easily generated.
- the electrode expands or contracts during its use, the adhesion between the electrode and the separator deteriorates, and the battery characteristics deteriorate, and Short-circuiting caused the battery to heat up and, in some cases, to melt or even break.
- the battery separator made of a porous film obtained by stretching at a high magnification in this way is not Therefore, in a high-temperature environment such as when the temperature is abnormally raised, the heat shrinkage is still remarkable, and in some cases, it may melt or break and may not function as a partition between electrodes. is there.
- the porous film obtained by this method does not melt or break even in a high-temperature environment, and has excellent heat resistance.
- the porous film undergoes stretching in the production process.
- the strength is not sufficient and the problem of heat shrinkage has not been improved. That is, as described above, a porous film for separation that does not melt or break under a high-temperature environment and has a small heat shrinkage ratio has not been known.
- the present invention has been made in order to solve the above-described problem in the conventional battery manufacturing.
- an electrode and a separator are temporarily bonded as an electrode separator laminate.
- the battery can be manufactured efficiently without mutual displacement between the electrode and the separator, and after the battery is manufactured, it does not melt or break at high temperatures, and furthermore, does not undergo heat shrinkage.
- Still another object of the present invention is to provide a method for producing a battery using such an adhesive porous film. Disclosure of the invention
- a probe having a diameter of l mm is placed on a porous film under a load of 7 Og by using a needle probe thermomechanical analyzer, and the temperature is raised from room temperature at a rate of 2 min.
- the thickness of the porous film was measured while being heated.
- a certain porous film is used as a base material porous film, and a polyfunctional isocyanate is reacted with a reactive polymer having a functional group capable of reacting with an isocyanate group, and partially crosslinked.
- An adhesive-carrying porous film for a battery separator is provided, wherein the adhesive is carried on the porous substrate film.
- the substrate porous film comprises a polyolefin resin composition of a polyolefin resin having a weight average molecular weight of at least 500,000 and a crosslinkable rubber having a double bond in a molecular chain, It is preferable that the crosslinkable rubber is crosslinked.
- an electrode / porous film laminate obtained by pressing an electrode on the adhesive-carrying porous film, and a multifunctional isocyanate as a reactive polymer in the electrode / porous film laminate.
- An electrode / multi- J film assembly is provided in which the reaction is allowed to further crosslink the partially crosslinked adhesive, and the electrode is bonded to the porous film.
- an electrolytic solution containing a polyfunctional isocyanate is injected into the battery container, and heated to form a porous film.
- the unreacted reactive polymer in the supported partially cross-linked adhesive is reacted with the above-mentioned polyfunctional isocyanate, and further cross-linked, the electrode is bonded to the porous film, and the electrode Z porous film joint is formed.
- a method for producing a battery characterized by obtaining a battery having the porous film in the electrode / porous film assembly as a separator.
- the adhesive-supported poly ( J) film for a battery separator according to the present invention is obtained by reacting a reactive polymer having a functional group capable of reacting with an isocyanate group with a polyfunctional isocyanate, and partially reacting a crosslinked polymer.
- the porous polymer is supported on the porous base material film as a partially cross-linked adhesive, and the porous base material film is composed of a polyolefin resin having a weight average molecular weight of at least 500,000 and a molecular weight of at least 500,000. It comprises a polyolefin resin composition with a crosslinkable rubber having a double bond in the chain, and is obtained by crosslinking the crosslinkable rubber.
- the porous film carrying the partially crosslinked reactive polymer has an adhesive property by the partially crosslinked adhesive, so that the electrode is arranged along the porous film, and it is preferable to pressurize the film under heating.
- the electrode can be easily temporarily bonded to the porous film, and thus, in the production of the battery, the electrode / porous film (separate film) laminate without slippage between the electrode and the porous film (separate film)
- the battery can be manufactured efficiently.
- the porous film in the adhesive-carrying porous film preferably comprises a polyolefin resin having a weight average molecular weight of at least 500,000 and a crosslinkable rubber having a double bond in a molecular chain.
- the cross-linkable rubber is cross-linked and has a heat-resistant temperature of 200 ° C. or higher. It is possible to obtain a battery having excellent safety at high temperatures by using the adhesive-carrying porous film according to the present invention, which functions as a separator with little heat shrinkage without breaking the film and has a small heat shrinkage. Can be. BEST MODE FOR CARRYING OUT THE INVENTION
- the adhesive-carrying porous film for the battery separator according to the present invention was prepared by using a needle-probe thermomechanical analyzer to apply a lmm-diameter probe under a load of 70 g to a porous film.
- the thickness of the porous film is measured while heating the porous film at a temperature rising rate of 2 ° C / min from room temperature, and the thickness of the porous film is the thickness when the probe is mounted. (Hereinafter, this thickness is referred to as the initial thickness of the porous film.)
- the temperature at which the temperature reaches 1 Z 2 hereinafter, this temperature is referred to as the heat-resistant temperature of the film) is 200 ° C. or more.
- the porous film is made of a porous film, and a partially cross-linked adhesive obtained by reacting a polyfunctional isocyanate with a reactive polymer having a functional group capable of reacting with an isocyanate group and partially cross-linking the porous film is used as the base material porous film.
- a partially cross-linked adhesive obtained by reacting a polyfunctional isocyanate with a reactive polymer having a functional group capable of reacting with an isocyanate group and partially cross-linking the porous film is used as the base material porous film.
- the substrate porous film preferably comprises a polyolefin resin composition of a polyolefin resin having a weight-average molecular weight of at least 500,000 and a crosslinkable rubber having a double bond in a molecular chain. It is made by crosslinking.
- a polyfunctional isocyanate is reacted with a reactive polymer having a functional group capable of reacting with an isocyanate group on a base porous film having the above-mentioned thermal characteristics, and partially crosslinked.
- a partially cross-linking adhesive for battery separation If a porous film carrying an adhesive is used, and the porous film functions as a separator as described later, the separator does not easily melt or break even at high temperatures. Since the thickness is maintained, the heat shrinkage is small, and the short circuit between the electrodes is well prevented, so that the safety of the battery can be improved.
- the measurement of the thickness of the substrate porous film using the insertion probe type thermomechanical analyzer will be described.
- the porous film is brought into contact with the tip of the probe by a load from the probe.
- its thickness is somewhat reduced.
- the thickness of the porous film at this time is referred to as an initial thickness.
- the temperature of the porous film rises, its thickness gradually decreases.However, when the resin constituting the porous film is melted or becomes semi-molten, a large decrease in thickness occurs. In addition, there is a phenomenon that the thickness slightly returns due to the subsequent shrinkage.
- the temperature of the porous film when the thickness of the porous film continues to decrease and reaches the initial thickness of 1 Z 2 is defined as the heat-resistant temperature of the porous film. . If this heat resistance temperature is high, the porous film can maintain its thickness up to a higher temperature without disintegration or rupture, and thus, such a porous film can be used as a separator. By doing so, it is possible to obtain a battery with excellent safety in a high-temperature environment.
- the porous substrate film is not particularly limited as long as it has solvent resistance and oxidation-reduction resistance in addition to the above-mentioned thermal characteristics.
- a porous film made of a polyolefin resin such as propylene or polybutylene, polyamide, cellulose acetate, polyacrylonitrile, or the like can be used.
- the substrate porous film is particularly composed of a polyolefin resin composition of a polyolefin resin having a weight average molecular weight of 500,000 or more and a crosslinkable rubber having a double bond in a molecular chain.
- a porous film obtained by cross-linking the cross-linkable rubber is preferably used.
- the polyolefin resin composition may contain a polyolefin resin or a thermoplastic elastomer having a weight average molecular weight of less than 500,000, if necessary.
- Examples of the polyolefin resin having a weight average molecular weight of 500,000 or more include polyolefin resins such as polyethylene and polypropylene.
- This polyolefin resin Although the upper limit of the weight-average molecular weight is not particularly limited, it is usually about 800,000. These polyolefin resins may be used alone or in combination of two or more. However, according to the present invention, among these, an ultrahigh molecular weight polyethylene resin having a weight average molecular weight of 500,000 or more is particularly preferably used because the obtained porous film has high strength.
- crosslinkable rubber examples include a gen-based polymer having a double bond in a molecule such as polybutadiene and polyisoprene, and a ternary polymer having a double bond in a molecule such as an ethylene-propylene monogen monomer. Polymers and the like are preferably used.
- ethylene-propylene-gen-monomer-terpolymer as the gen-monomer, there may be mentioned, for example, dicyclopentagen, ethylidene norporene, hexadiene, etc. Among these, from the viewpoint of the crosslinking reactivity, And ethylidene norporene are preferably used.
- the terpolymer containing ethylidene norportene as a component is excellent in crosslinking reactivity, and can more reliably improve the heat resistance of the obtained porous film.
- a terpolymer containing ethylidene norporene as a constituent component has an alicyclic structure derived from a gen monomer and a double bond. A hydrogenated part can also be used.
- These terpolymers may be any of a random copolymer, a block copolymer, a graft copolymer and the like. Such terpolymers are commercially available as various EPDMs.
- the proportion of one component of the gen monomer in the terpolymer is preferably at least 3% by weight based on the total weight of ethylene, propylene and the gen monomer. A range of 4 to 20% by weight is particularly preferred.
- the ratio of one component of ethylene propylene Z gen monomer is 0.5 to 0.75 0.05 to 0.47 / 0.03 to 0.2 in weight ratio.
- An original copolymer is preferably used.
- Polynorpolene which is a ring-opening polymer of norpolene, is a polymer having a double bond in the molecule and having a glass transition point of about 35 ° C, and is not rubbery in itself, but is aromatic.
- Compositions containing oils such as oils, naphthenic oils, and paraffinic oils have a glass transition point of about 160 " ⁇ , have elastic properties, and have various rubber properties.
- it is used as a modifier or the like, it can be suitably used as a crosslinkable polymer also in the present invention, and therefore is included in the above crosslinkable rubber.
- polyolefin resin having a weight-average molecular weight of less than 500,000 examples include polyolefin resins such as polyethylene and polypropylene, and modified polyolefin resins such as an ethylene-acryl monomer copolymer and an ethylene-vinyl acetate copolymer.
- thermoplastic elastomer examples include thermoplastic elastomers such as polystyrene, polyolefin, polygen, pinyl chloride, and polyester.
- the lower limit of the weight average molecular weight of such a polyolefin resin having a weight average molecular weight of less than 500,000 is not particularly limited, but is usually about 20,000.
- These polyolefin resins and thermoplastic elastomers may be used alone or in combination of two or more. Further, among the above thermoplastic elastomers, those having a double bond in the molecule can be used as the crosslinkable rubber.
- the polyolefin resin having a weight-average molecular weight of less than 500,000 includes, among others, a polyethylene resin having a low melting point, a polyolefin-based elastomer having crystallinity, and a polymethacrylic acid having a low melting temperature.
- a graft copolymer having an ester in a side chain is preferred because it provides a low shutdown temperature.
- the L-type film is made of a polyolefin resin composition of a polyolefin resin having a weight-average molecular weight of 500,000 or more and a crosslinkable rubber having a double bond in a molecular chain.
- the ratio of the polyolefin resin having a weight average molecular weight of 500,000 or more in the polyolefin resin composition is determined by the strength of the porous film obtained from the polyolefin resin composition.
- the range of 5 to 95% by weight in the polyolefin resin composition is preferable, and the range of 10 to 90% by weight is particularly preferable.
- the proportion of the crosslinkable rubber is 3% by weight or more, and particularly preferably in the range of 5 to 35% by weight.
- the resulting porous film may not be sufficiently improved in heat resistance even by crosslinking of the crosslinkable rubber.
- the polyolefin resin composition for producing a porous film may contain a polyolefin resin having a weight average molecular weight of less than 500,000 or a thermoplastic elastomer, if necessary. Well, in this case, their proportion depends on the polymer composition The total amount is preferably in the range of 1 to 50% by weight.
- a polyolefin resin composition of a polyolefin resin having a weight-average molecular weight of at least 500,000 as described above and a crosslinkable rubber having a double bond in a molecular chain is formed, and the crosslinking rubber is crosslinked.
- a porous film can be obtained by forming a film by an appropriate method such as a conventionally known dry film forming method and a wet film forming method, and then crosslinking the crosslinkable rubber in the film.
- the polyolefin resin composition is mixed with a solvent, kneaded, and heated and dissolved to form a kneaded slurry, which is formed into a sheet by using an appropriate means, and the sheet is rolled. Further, after the film is uniaxially or biaxially stretched to form a film, and the solvent is extracted and removed from the film, a porous film can be obtained. Next, by using the double bond of the crosslinkable rubber of the porous film to crosslink the crosslinkable rubber, the porous film can be given the required heat resistance.
- the solvent for obtaining the slurry-like kneaded material includes, for example, aliphatic or alicyclic hydrocarbons such as nonane, decane, pendecane, dodecane, decalin, and liquid paraffin, and a boiling point of Mineral oil fractions and the like corresponding to these solvents are used, and among them, non-volatile solvents containing a large amount of alicyclic hydrocarbons such as liquid paraffin are preferably used.
- the proportion of the polyolefin resin composition in the slurry kneaded product is preferably in the range of 5 to 30% by weight, more preferably in the range of 10 to 30% by weight, and most preferably in the range of 10 to 25% by weight. That is, the ratio of the polyolefin resin composition in the slurry-like kneaded material is preferably 5% by weight or more from the viewpoint of improving the strength of the obtained porous film.
- the polyolefin resin having a weight average molecular weight of 500,000 or more is preferably used.
- the content is preferably 30% by weight or less so that it can be sufficiently dissolved in a solvent and kneaded to a state close to the stretched state, and a sufficient entanglement of the polymer chains can be obtained.
- additives such as an antioxidant, an ultraviolet absorber, a dye, a nucleating agent, a pigment, and an antistatic agent may be added to the kneaded material within a range that does not impair the purpose of the present invention. be able to.
- the polyolefin resin composition and a solvent are mixed and kneaded to form a slurry-like kneaded product,
- a conventionally known appropriate method can be used.
- the polyolefin resin composition and the solvent were kneaded in a patch system using a Panbury mixer, a kneader or the like, and thus the kneaded product was rolled or cooled between a pair of cooled rolls.
- the sheet may be sandwiched between a pair of metal plates and cooled to form a sheet by rapid crystallization, or the sheet may be formed using an extruder equipped with a T-die or the like.
- the kneading temperature is not particularly limited, but is preferably in the range of 100 to 200 ° C.
- the thickness of the sheet obtained in this way is not particularly limited, but usually a range of 3 to 20 mm is preferable.Furthermore, the obtained sheet is rolled using a heat press or the like. The thickness may be 5 to 3 mm. This rolling is usually preferably performed at a temperature of 100 to 140.
- a normal ten-in-one method, a roll method, an inflation method or a combination of these methods may be used. Any method such as uniaxial stretching and biaxial stretching can be adopted. In the case of biaxial stretching, either vertical or horizontal simultaneous stretching or sequential stretching may be used.
- the temperature of the stretching treatment is preferably in the range of 100 to 140 ° C.
- the solvent removal treatment is a treatment for removing a solvent from a sheet to form a porous structure.
- the solvent removal treatment can be performed by washing a sheet with a solvent to remove a residual solvent.
- the solvent include hydrocarbons such as pentane, hexane, heptane, and decane; chlorinated hydrocarbons such as methylene chloride and carbon tetrachloride; fluorinated hydrocarbons such as trifluoride, etc .; Easily volatile solvents such as alcohols such as ters, methanol and ethanol, ketones such as acetone and methyl ether ketone are used. These may be used alone or in combination of two or more.
- the desolvation treatment of the sheet using such a solvent is performed, for example, by immersing the sheet in the solvent or showering the solvent on the sheet.
- a heat treatment to reduce the heat shrinkage.
- This heat treatment may be a single-stage heat treatment in which the porous film is heated once, or a multi-stage heat treatment in which the porous film is first heated at a relatively low temperature and then heated at a higher temperature. Further, a temperature rising type heat treatment in which the porous film is heated while being heated may be used. However, it is desirable that this heat treatment be performed so as not to impair the desired properties inherent in the porous film, such as the air permeability.
- the heating temperature depends on the composition of the porous film.
- a range of 40 to 140 ° C. is preferred. Heating can be started from a relatively low temperature, and then the heating temperature can be increased by heating or multi-step heat treatment, which can also serve as cross-linking of the cross-linkable rubber in the porous film. Since the heat resistance is gradually improved, heat treatment can be performed without impairing the originally desired properties of the porous film, such as air permeability, by heating, and the required heat treatment can be performed in a short time.
- the initial heating temperature is preferably in the range of 40 to 90 ° C., although it depends on the composition of the multi-layer film. Although it depends on the composition of the film, it is preferably in the range of 90 to 140 ° C.
- the crosslinkable rubber in the porous film is crosslinked as described above in order to increase the heat resistance of the obtained porous film before or after the heat treatment step.
- the heat resistance of the resulting porous film at high temperatures film rupture resistance
- the heat treatment of the porous film is also performed.
- the porous film is heated in the presence of oxygen, ozone, an oxygen compound or the like to cause a crosslink reaction to the crosslinkable rubber.
- oxygen for example, by heating the porous film in the air or irradiating it with ultraviolet rays or electron beams.
- a conventionally known peroxide can be used in combination to promote a desired crosslinking reaction.
- a plurality of crosslinking methods may be used in combination.
- the substrate porous film functions as a separator after the battery is manufactured.
- the thickness is preferably in the range of up to 60 m, and particularly preferably in the range of 5 to 50 / m.
- the porous base film has pores with an average pore size of 0.01 to 5 iim and a porosity of 20 to 80%. It should be in the range, especially in the range of 25-75%.
- the porous film of the substrate preferably has an air permeability determined in accordance with JISP 8117 in the range of 100 to 100 seconds / 100 cc. It should be in the range of 0 to 900 seconds / 100 cc.
- the adhesive-supporting porous film for a battery separator according to the present invention is obtained by reacting a reactive polymer having a functional group capable of reacting with an isocyanate group with a polyfunctional isocyanate, and partially crosslinking the reactive polymer.
- the polymer is a partially cross-linked adhesive, which is supported on the porous substrate film as described above, preferably in a range of 5 to 95% of the surface area thereof.
- the partially crosslinked adhesive has a gel fraction in the range of 5 to 80%.
- the reactive polymer by partially crosslinking the reactive polymer, the reactive polymer can be made into a partially crosslinked adhesive having adhesiveness.
- the electrode Z is formed by supporting the porous film on the porous film and temporarily bonding the electrode to the porous film with the partial cross-linking adhesive, and then the laminate is brought into contact with the electrolytic solution during the production of the battery.
- the reactive polymer preferably has a hydroxyl group or a hydroxyl group as a functional group having an active hydrogen capable of reacting with an isocyanate group. It is preferable that the composition contains a reactive monomer component having the above functional group together with the (meth) acrylate component.
- the reactive monomer include copolymerizable monomers containing a lipoxyl group such as (meth) acrylic acid, itaconic acid, and maleic acid, preferably (meth) acrylic acid; —Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxyl group-containing copolymerizable monomers such as 4-hydroxybutyl (meth) acrylate, preferably hydroxyalkyl (meth) acrylate.
- copolymerizable monomers having an amino group can also be used as the reactive monomers.
- Examples of the above (meth) acrylic acid esters include ethyl (meth) acrylate, When the number of carbon atoms in the alkyl group is 1 to 1, such as butyl (meth) acrylate, propyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dodecyl (meth) acrylate, etc. Alkyl esters of 2 are preferably used.
- the reactive polymer has a reactive monomer component as described above in a range of from 0 :: 20 to 20% by weight, a (meth) acrylate component, and if necessary, A copolymerizable monomer component having a nitrile group, preferably a (meth) acrylonitrile component, or a vinyl monomer component such as styrene, ⁇ -methylstyrene and vinyl acetate is preferable.
- the reactive polymer contains 80% by weight of a copolymerizable monomer component having a nitrile group, preferably a (meth) acrylonitrile component, so as to have excellent heat resistance and solvent resistance.
- the reactive polymer comprises from 0.1 to 20% by weight of the reactive monomer component, from 10 to 95% by weight of the (meth) acrylate component and from 4.9 to 4.9% of the (meth) acrylonitrile. It preferably comprises 60% by weight.
- the reactive polymer is not limited to the above, and may be a functional group capable of reacting with an isocyanate group, for example, a polymer having active hydrogen.
- a polymer having active hydrogen for example, a polymer having active hydrogen.
- Polyolefin-based polymers, rubber-based polymers, polyether-based polymers, and the like having a functional group can also be used.
- an acrylic modified fluororesin having a hydroxyl group in the molecule for example, Cefralcoat FG730B manufactured by Central Glass Co., Ltd., available as a varnish
- Cefralcoat FG730B manufactured by Central Glass Co., Ltd., available as a varnish
- the reactive polymer preferably has a glass transition temperature in the range of 0 to 100, particularly preferably in the range of 20 to 100 ° C.
- the reactive polymer as described above can be obtained as a polymer solution by copolymerizing a required monomer in a solvent such as benzene, toluene, xylene, ethyl acetate, and butyl acetate.
- a solvent such as benzene, toluene, xylene, ethyl acetate, and butyl acetate.
- the reactive polymer Since one aqueous dispersion can be obtained, the polymer is separated and dried from this, and then dissolved in the above-mentioned solvent to be used as a polymer solution.
- a polyfunctional crosslinkable monomer such as divinylbenzene or trimethylolpropane triacrylate may be used in an amount of 1% by weight or less in addition to the above-mentioned monomers.
- polyfunctional isocyanates include phenylene diisocyanate, tolylene diisocyanate, diphenyl methane diisocyanate, diphenyl terdiisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate and the like.
- isocyanate adducts obtained by adding a polyol such as trimethylpropane to these diisocyanates are also preferably used.
- a predetermined amount of the above-mentioned polyfunctional isocyanate is added to the solution of the reactive polymer, that is, an amount sufficient to partially crosslink the reactive polymer is blended.
- the reactive polymer is reacted with the polyfunctional isocyanate, and is reacted with a functional group (for example, an active hydrogen group) of the reactive polymer.
- Crosslinking is carried out, and this is carried on a substrate porous film as a partially crosslinked adhesive having adhesiveness, whereby an adhesive-carrying porous film for a battery separator according to the present invention is obtained.
- the partially cross-linked adhesive obtained by partially cross-linking the reactive polymer preferably has a gel fraction in the range of 5 to 80%.
- the above gel fraction is defined as that a porous film is loaded with a reactive polymer composition (A + B) part by weight composed of a reactive polymer A part by weight and a polyfunctional isocyanate B part by weight, and reacted.
- the porous film is immersed in toluene at a temperature of 23 ° C for 7 days, and then dried, and then the adhesive remaining on the porous film is removed by C parts by weight. Is the value defined as (CZ (A + B)) XI 00 (%).
- the polyfunctional isocyanate is usually added to 100 parts by weight of the reactive polymer. It can be obtained by blending in the range of 0.1 to 10 parts by weight, heating and hardening, and performing a crosslinking reaction until the obtained reactive polymer is characteristically stabilized.
- the heat-curing temperature and the time required for it depend on the reactive polymer and polyfunctional isocyanate used. Therefore, these reaction conditions can be determined. If the mixture is heated and reacted at a temperature of 50 ° C. for 7 days, the crosslinking reaction is completed and the obtained partially crosslinked reactive polymer, that is, the partially crosslinked adhesive is characteristically stabilized.
- the reaction product obtained by reacting the reactive polymer with the polyfunctional isocyanate and partially reacting and cross-linking the reactive polymer has an adhesive property.
- this reaction product is called a partially cross-linked adhesive. Therefore, by causing such a partially cross-linked adhesive having a gel fraction of 5 to 80% to be supported on a porous film to form an adhesive-carrying porous film, as described later, this porous film When the electrode is pressure-bonded to the electrode, the electrode can be easily temporarily bonded to the porous film, and thus an electrode / porous film laminate can be obtained.
- the electrode porous film laminate is charged in a battery container and then injected with an electrolytic solution in which a polyfunctional isocyanate is dissolved in the battery container, the temporary adhesion of the electrode porous film is maintained.
- the unreacted reactive polymer in the partially cross-linked adhesive is further cross-linked by the polyfunctional isocyanate in the electrolyte, and the electrode is firmly adhered to the porous film with good adhesiveness. Can be obtained.
- the reactive polymer is partially crosslinked so as to have a gel fraction of 5 to 80%, and its elution into the electrolytic solution is prevented or reduced, Since it is used effectively for bonding the electrode and the porous film, the electrode and the porous film are stably and more firmly bonded.
- the partially cross-linked adhesive preferably has a gel fraction of 20 to 60%.
- the unreacted reactive polymer in the partially cross-linked adhesive does not react or cross-link any more, and is stable for a long time. Even if stored for a long time, there is no deterioration.
- the reactive polymer composition in order to support the reactive polymer composition comprising the reactive polymer and the polyfunctional isocyanate on the porous base material film, for example, the reactive polymer composition is directly applied to the porous base material film. Alternatively, it may be applied to a peelable sheet, dried, and then transferred to a porous substrate film.
- organic solvents such as methyl ethyl ketone and methyl isobutyl ketone, and fine powders of heavy calcium carbonate and sand are used. Inorganic like powder Fine powder may be blended with the reactive polymer composition in a proportion of 50% by weight or less as a fluidity modifier.
- the reactive polymer composition when a reactive polymer composition comprising a reactive polymer and a polyfunctional isocyanate is applied to a base porous film, the reactive polymer composition partially, that is, for example, has a linear shape, a spot shape, It is preferable to partially coat the surface of the base porous film on which the reactive polymer composition is to be applied, preferably in a range of 5 to 95%, preferably in a lattice, stripe, or turtle pattern.
- the reactive polymer composition By applying the reactive polymer composition, a strong adhesion between the electrode and the porous film (and thus the separator) is obtained, and the use of such an electrode separator assembly is superior. A battery having excellent characteristics can be obtained.
- a partially cross-linked adhesive having a gel fraction of 5 to 80% is supported on a porous substrate film to form an adhesive-supporting porous film for a battery separator.
- the electrode is made to follow the electrode, and is preferably pressurized while being heated to a temperature of 50 to 10 Ot to obtain an electrode Z porous film laminate.
- the negative electrode and the positive electrode differ depending on the battery, but are generally in the form of a sheet in which an active material is supported on a conductive base material and, if necessary, a conductive agent using a resin binder. Used.
- the porous film laminate by using such an electrode Z porous film laminate, there is no mutual shift between the electrode and the porous film, and the battery can be manufactured efficiently.
- the porous film itself can function as a high-performance separator to obtain a highly safe battery.
- a partially cross-linked adhesive is supported on both the front and back surfaces of the porous substrate film, and the electrodes, that is, the negative electrode and the positive electrode are respectively pressed and temporarily bonded on both the front and back surfaces, and the electrode / porous film is bonded.
- a partially cross-linked adhesive may be supported only on one surface of the porous substrate film, and the electrode, that is, either the negative electrode or the positive electrode, may be pressed on only one surface of the porous film. Then, they may be temporarily bonded to form an electrode Z porous film laminate.
- a laminate having a configuration of a positive (negative) polar porous film / a negative (positive) polar porous film can also be used.
- the electrode Z porous film laminate according to the present invention can be suitably used for the production of a battery. That is, after the electrode porous film laminate is charged in a battery container, an electrolytic solution in which a polyfunctional isocyanate is dissolved is injected into the battery container, and the electrode Z porous film is charged. By reacting with the unreacted reactive polymer in the partially cross-linked adhesive of the laminate and further cross-linking it, the electrode is bonded and integrated with the porous film. An electrode that functions and is firmly bonded to the electrode
- a battery having a Z separatory junction can be obtained.
- the ratio of the polyfunctional isocyanate in the electrolytic solution is usually in the range of 0.1 to 20 parts by weight based on 100 parts by weight of the reactive polymer supported on the porous film.
- the proportion of the polyfunctional isocyanate is less than 0.1 part by weight based on 100 parts by weight of the reactive polymer supported on the porous film, the crosslinking of the reactive polymer with the polyfunctional isocyanate is not performed. Insufficient, in the resulting electrode separator joint, it is not possible to obtain strong adhesion between the electrode and the separator.
- the proportion of the polyfunctional isocyanate is more than 20 parts by weight based on 100 parts by weight of the uncrosslinked reactive polymer, the adhesive after crosslinking is too hard, and the separation and the electrode are not performed. The adhesion between them may be hindered.
- a partially cross-linked adhesive obtained by previously partially cross-linking a reactive polymer is supported on a porous film, and an electrode is formed along the surface to deform the porous film. While heating to a temperature that does not cause such problems as above, pressurize and partially insert the adhesive into the electrode, so to speak, temporarily bond the electrode to the base porous film, and laminate the electrode Z porous film. After that, the laminate is charged into a battery container, and an electrolyte in which a polyfunctional isocyanate is dissolved is poured into the battery container, and reacts with the unreacted reactive polymer in the partially cross-linked adhesive. Then, the adhesive is further crosslinked to obtain an electrode Z porous film assembly. That is, the electrodes are permanently bonded to the porous film as it were. Therefore, in such an electrode-porous film assembly, the porous film and the electrode are firmly bonded.
- the porous film in the electrode-porous film assembly obtained in this way functions as a separator after being incorporated in the battery.
- the porous film that is, Separete
- the electrode separator assembly is not only a negative electrode separator Z positive electrode assembly, but also an electrode separator assembly of one of a negative electrode and a positive electrode, and , Positive (negative) pole / separate evening Negative (positive) pole It is assumed that the following configuration is included.
- the electrolyte is a solution obtained by dissolving an electrolyte salt in a solvent.
- an alkali metal such as hydrogen, lithium, sodium, and potassium
- an alkaline earth metal such as calcium and strontium
- a tertiary or quaternary ammonium salt such as hydrochloric acid, nitric acid, Inorganic acids such as phosphoric acid, sulfuric acid, borofluoric acid, hydrofluoric acid, hexafluorophosphoric acid, and perchloric acid
- organic acids such as organic carboxylic acids, organic sulfonic acids, and fluorine-substituted organic sulfonic acids are used as anionic components.
- an electrolyte salt containing alkali metal ion as a cation component is particularly preferably used.
- any solvent can be used as long as it dissolves the above-mentioned electrolyte salt.
- the non-aqueous solvent include ethylene carbonate, propylene carbonate, butylene carbonate, and the like. Cyclic esters such as acetylbutyrolactone, ethers such as tetrahydrofuran and dimethoxyethane, and chain esters such as dimethylcarbonate, ethylcaponate and ethylmethylcaponate are used. These solvents are used alone or as a mixture of two or more. Industrial applicability
- the adhesive-supporting porous film for a battery separator according to the present invention By using the adhesive-supporting porous film for a battery separator according to the present invention, it is possible to easily obtain an electrode / porous film (separator) laminate without shearing movement. During production, the electrodes form an electrode separator assembly that is firmly and stably adhered to the porous film (Separate overnight), so the generation of defective products is suppressed and the batteries are manufactured with high productivity. Can be manufactured.
- the adhesive-supporting porous film for the battery separator according to the present invention does not melt or break at high temperatures after the battery is manufactured, and has a small heat shrinkage. Since it functions as a battery, it is possible to obtain a battery with excellent safety at high temperatures.
- Example 1 Example 1
- the thickness and porosity of the porous film were determined as follows. (Thickness of porous film).
- the obtained kneaded material was sandwiched between metal plates cooled to 0 ° C., rolled while cooling, and formed into a sheet.
- this sheet is heat-pressed at 115 ° C until the thickness becomes 0.5 mm, and further simultaneously biaxially stretched at 4.5 ⁇ 4.5 times in length and width at the same temperature, and then removed using heptane. Solvent treatment.
- the porous film thus obtained is heated in air at 85 ° C. for 6 hours, and then heated at 118 ° C. for 1.5 hours to perform heat treatment of the porous film and crosslink in the porous film.
- the desired porous film A was obtained by crosslinking the reactive rubber (the above-mentioned polynorporene).
- This porous film A had pores with a thickness of 25 im, a porosity of 50%, and an average pore diameter of 0.1.
- the temperature was 370 ° C. (Measurement of heat-resistant temperature of porous film by using a needle-type probe-type thermomechanical analyzer)
- a 5-mm square hole is placed on the sample table of a needle-type probe-type thermomechanical analyzer (EXSTAR6000, manufactured by Seiko Denshi Co., Ltd.).
- a sample of the quality film was placed, and a 1 mm diameter probe with a tip was placed on the sample.
- the mixture was subjected to emulsion polymerization by a conventional method to obtain an aqueous dispersion of a reactive polymer.
- the weight average molecular weight of this reactive polymer was about 850,000, and the glass transition temperature was 113.
- the reactive polymer was precipitated by adding 10% hydrochloric acid to the aqueous dispersion of the reactive polymer, taken out, washed sufficiently with water, and dried under reduced pressure.
- the solution of the reactive polymer composition is linearly coated on release paper using a wire bar (0.2 mm in diameter of wire), dried, and then used to form a porous film A on the front and back of the porous film A.
- the reactive polymer composition was transferred to both sides.
- This porous film was put into a thermostatic chamber at a temperature of 50 for 7 days, and a part of the reactive polymer in the reactive polymer composition was reacted with a three-functional polymer to obtain a gel fraction of 5
- a porous film A carrying 8% of a partially crosslinked adhesive was obtained.
- a slurry having a solid concentration of 15% by weight was prepared.
- the slurry was applied on a surface of a 20-m-thick aluminum foil to a thickness of 200 by a coating machine, and then dried at 80 ° C. for 1 hour.
- the slurry was similarly applied to a thickness of 200 im, dried at 120 ° C for 2 hours, and then passed through a roll press to obtain a positive electrode having a thickness of 200 / m.
- a sheet was prepared.
- Graphite powder and polyvinylidene fluoride resin were mixed at a weight ratio of 95: 5, and this was added to N-methyl-2-pyrrolidone to prepare a slurry having a solid concentration of 15% by weight.
- the slurry was applied to a surface of a copper foil having a thickness of 20 m to a thickness of 200 m using a coating machine, and then dried at 80 ° C for 1 hour.
- the slurry was similarly applied to a thickness of 200 m, dried at 120 ° C for 2 hours, and then passed through a roll press to form a negative electrode sheet having a thickness of 200 nm. Prepared.
- Rutotomoni placed along the Seikyokushiichito the partial cross-linking adhesive was supported porous film A surface, after along the negative electrode sheet on the back surface, the temperature 8 0 ° C, at a pressure 5 k gZ cm 2 After heating and pressurizing for 5 minutes, the positive and negative electrode sheets were pressure-bonded to the porous film, and a negative electrode porous film Z positive electrode laminated body temporarily bonded was obtained.
- the electrolyte salt lithium hexafluorophosphate (L i PF) was adjusted to a concentration of 1.2 mol ZL in a mixed solvent of ethylene / one-tonoethylmethyl carbonate (volume ratio 1/2). 6 ) was dissolved to prepare an electrolytic solution. Further, 3 parts by weight of trifunctional isocyanate obtained by adding 1 mol part of trimethylolpropane to 3 mol parts of toluene diisocyanate was dissolved in 100 parts by weight of the above electrolytic solution.
- the negative electrode porous film and the positive electrode laminate are charged in a coin-type battery can having a size of 201 to 16 serving also as a positive and negative electrode plate, and the electrolytic solution in which the trifunctional isocyanate is dissolved is placed in the coin-type battery can. After the injection, the battery can was sealed and a work in process was manufactured. Thereafter, the work-in-progress is put into a constant temperature chamber at a temperature of 50 for 7 days, and the unreacted reactive polymer in the partially cross-linked adhesive carried on the porous film of the negative electrode porous film and the positive electrode laminate is applied.
- the battery was charged and discharged five times at a rate of 0.2 CmA, charged at a rate of 0.2 CmA, and then discharged at a rate of 2.0 CmA.
- the discharge load characteristic evaluated at a discharge capacity ratio at a rate of C mA of Z 0.2 CmA was 87%.
- the positive electrode Z porous film punched to a predetermined size and the negative electrode laminate are impregnated with the electrolytic solution in which the trifunctional isocyanate is dissolved, sandwiched between glass plates, and furthermore, fluorine is added to suppress volatilization of the electrolytic solution.
- the electrolytic solution in which the trifunctional isocyanate is dissolved, sandwiched between glass plates, and furthermore, fluorine is added to suppress volatilization of the electrolytic solution.
- Wrap it in a resin sheet put a 50 g weight on it, put it in a constant temperature room at a temperature of 50 ° C for 7 days, and carry it on the porous film of the positive-electrode no-porous film Z negative-electrode laminate.
- the reactive polymer in the partially crosslinked adhesive is subjected to a crosslinking reaction with the above trifunctional isocyanate, and the positive and negative electrodes are bonded to a porous film (that is, a separator in a battery). A negative electrode assembly was obtained.
- the positive electrode Z porous film thus obtained, the negative electrode assembly was sandwiched between glass plates and placed in a dryer at 200 hours for 1 hour.
- the glass plate was removed, the separator was peeled off from the positive and negative electrodes, read by a scanner, and the area heat shrinkage was calculated to be 10% as compared with the area of the porous film used first.
- Polynorpolene Polynorpolene
- the obtained kneaded material was sandwiched between metal plates cooled to 0 ° C., rolled while being rapidly cooled, and formed into a sheet. Then, the sheet was heat-pressed at a temperature of 117 ° C until the thickness became 0.5 mm, and further, simultaneously biaxially stretched 3.8 ⁇ 3.8 times in length and width at the same temperature. The solvent was removed using.
- the porous film thus obtained was heated in air at 85 ° C. for 6 hours, and then After heating for a time, the porous film was heat-treated, and the crosslinkable rubber in the porous film was crosslinked to obtain the desired porous film B.
- This porous film B has pores with a thickness of 23 m, a porosity of 45%, and an average pore diameter of 0.07 zm.
- a needle probe type thermomechanical analyzer is used. When used and examined, the heat resistance temperature was 430 ° C.
- Got B. Using the porous film B carrying the partially cross-linked adhesive, a negative electrode Z separator and a positive electrode laminate were obtained in the same manner as in Example 1, and the coin-shaped lithium was used in the same manner as in Example 1 using this.
- An ion secondary battery was assembled, and the discharge load characteristics of this battery were evaluated in the same manner as in Example 1. The result was 89%.
- the thermal shrinkage of the separator was 16%.
- Example 1 a reactive polymer composition was prepared by using 2 parts by weight of diphenylmethane diisocyanate instead of 3 parts by weight of trifunctional isocyanate obtained by adding 1 mole part of trimethylolpropane to 3 mole parts of hexamethylene diisocyanate.
- a product was prepared and applied to both sides of the front and back of the same porous film A as in Example 1 so as to have a dot shape of 30% of the area thereof. For 7 days to obtain a porous film A carrying a partially crosslinked adhesive having a gel fraction of 35%.
- a negative electrode Z separator and a positive electrode laminate were obtained in the same manner as in Example 1, and were used as in Example 1 Similarly, a coin-type lithium ion secondary battery was assembled, and the discharge load characteristic of this battery was evaluated in the same manner as in Example 1. The result was 91%. The thermal shrinkage of the separator was 1%. 8%.
- the mixture was subjected to solution polymerization according to a conventional method to obtain a toluene solution of a reactive polymer.
- the weight average molecular weight of this reactive polymer was about 300,000, and the glass transition temperature was 5 ° C.
- To the reactive polymer solution 1 part by weight of trifunctional isocyanate obtained by adding 1 mol part of trimethylolpropane to 3 mol part of hexamethylenedithiocyanate was added to 100 parts by weight of the solid content, A reactive polymer composition was prepared.
- This reactive polymer composition was applied on a peelable stretched polypropylene tree J3 purifying film in a spot-like manner to 30% of its surface area and dried, and then this was coated on the front and back surfaces of the same porous film A as in Example 1. And press-fit while heating at a temperature of 60 ° C.
- the positive electrode sheet After peeling the releasable stretched polypropylene film from the porous film A carrying the partially cross-linked adhesive, the positive electrode sheet is arranged along the front surface, and the negative sheet is arranged along the back surface. Heating and pressing were performed at 80 ° C. and a pressure of 5 kgcm 2 for 5 minutes, and the positive and negative electrode sheets were pressure-bonded to the porous film, and a negative electrode Z porous film positive electrode laminate obtained by temporary bonding was obtained. Using the thus obtained negative electrode // porous film / positive electrode laminate, a coin-type lithium ion secondary battery was assembled in the same manner as in Example 1, and the battery was manufactured in the same manner as in Example 1. When the discharge load characteristics were evaluated, it was 89%, and the thermal shrinkage in the separation-evening was 15%.
- EP DM (Supreto Chemical Industry Co., Ltd. Esplene 5 12 F, ethylidene norpoleneen content 4% by weight) 20% by weight and 80% by weight of ultra high molecular weight polyethylene resin with a weight average molecular weight of 150,000 15 parts by weight of the polyethylene resin composition and 85 parts by weight of liquid paraffin were uniformly mixed in a slurry form, and dissolved and kneaded at a temperature of 160 ° C. for about 1 hour using a small kneader. Thereafter, the obtained kneaded material was sandwiched between metal plates cooled to 0 ° C., rapidly cooled, and rolled to form a sheet.
- the sheet is heat-pressed at a temperature of 115 until the thickness becomes 0.4 mm, and furthermore, it is stretched to 4.0 ⁇ 4.0 times at a temperature of 123 ° C.
- solvent removal treatment was performed using heptane.
- the porous film thus obtained is heated in air at 85 ° C. for 6 hours, and then heated at 116 for 1.5 hours to perform heat treatment on the porous film.
- the crosslinkable rubber therein was crosslinked to obtain a desired porous film C.
- This porous film C has pores having a thickness of 24 / m, a porosity of 42%, and an average pore diameter of 0.08 m.
- the needle probe thermomechanical analyzer is used. When used and examined, the heat resistance temperature was 320 ° C.
- porous film C was used instead of porous film A in Example 1.
- a negative electrode separator / positive electrode laminate was obtained in the same manner as in Example 1, and using this, a coin-shaped laminate was obtained in the same manner as in Example 1.
- a lithium ion secondary battery was assembled and the discharge load characteristics of this battery were evaluated in the same manner as in Example 1, it was 86%, and the thermal contraction rate of Separee overnight was 12%. .
- the above mixture was subjected to solution polymerization according to a conventional method to obtain a solution of the reactive polymer in ethyl acetate.
- the weight average molecular weight of this reactive polymer was about 49,000, and the glass transition temperature was 35 T.
- 1 part by weight of trifunctional isocyanate obtained by adding 1 mol part of trimethylolpropane to 3 mol part of hexamethylenedisiloxane is added to 100 parts by weight of the solid content, A porous film A carrying a partially crosslinked adhesive having a gel fraction of 52% was obtained in the same manner as in Example 1 except that the reactive polymer composition was prepared.
- Example 1 Using the porous film A carrying the partially cross-linked adhesive, in the same manner as in Example 1, A negative electrode Z separator Z positive electrode laminate was obtained, and using this, a coin-type lithium-ion secondary battery was assembled in the same manner as in Example 1, and the discharge load characteristics of this battery were evaluated in the same manner as in Example 1. As a result of the evaluation, it was 88%, and the heat shrinkage rate of Separee overnight was 9%. Comparative Example 1
- a battery was assembled using the same porous film A as in Example 1 without using the partially crosslinked adhesive on the same porous film. That is, the positive electrode sheet was made to extend along the surface of the porous film, and the negative electrode sheet was made to extend along the back surface to form a laminate.
- a coin-type lithium ion secondary battery was assembled in the same manner as in Example 1, except that the above-mentioned laminate was used instead of the electrode-porous film laminate.
- the discharge load characteristics were evaluated in the same manner as in Example 1. The result was 95%.
- the thermal shrinkage of the separator was 72%.
- a polyethylene resin having a weight average molecular weight of 200,000 and 50 parts by weight of a polyethylene resin composition composed of 40% by weight of an ultra high molecular weight polyethylene resin having a weight average molecular weight of 150,000 and 85 parts by weight of liquid paraffin The mixture was mixed into a slurry, and dissolved and kneaded at a temperature of 160 ° C for about 1 hour using a small kneader. Thereafter, the obtained kneaded material was sandwiched between metal plates cooled to ⁇ , rolled while being rapidly cooled, and formed into a sheet.
- the sheet was heat-pressed at a temperature of 115 until the thickness became 0.5 mm, and further simultaneously biaxially stretched 4.0 ⁇ 4.0 times at the same temperature, and then heptane was removed. And used to remove the solvent.
- the porous film thus obtained was heated in air at 85 ° C. for 6 hours, and then at 116 for 1 hour to obtain a desired porous film D.
- the porous film D has pores with a thickness of 24 m, a porosity of 39%, and an average pore diameter of 0.1 l / m.
- the needle-type probe-type thermomechanical analyzer is used.
- the heat-resistant temperature was 160 ° C.
- a negative electrode Z separator Z and a positive electrode laminate were obtained in the same manner as in Example 1, and using this, the same procedure as in Example 1 was performed.
- a coin-type lithium ion secondary battery was assembled, and the discharge load characteristics of this battery were evaluated in the same manner as in Example 1. The result was 90%.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04725201.0A EP1650818B1 (en) | 2003-04-09 | 2004-04-01 | Adhesive-carrying porous film for cell separator and its application |
US10/552,486 US7833654B2 (en) | 2003-04-09 | 2004-04-01 | Adhesive-carrying porous film for battery separator and use thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003-104804 | 2003-04-09 | ||
JP2003104804 | 2003-04-09 | ||
JP2004-27681 | 2004-02-04 | ||
JP2004027681A JP2004323827A (ja) | 2003-04-09 | 2004-02-04 | 電池用セパレータのための接着剤担持多孔質フィルムとその利用 |
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WO2004091014A1 true WO2004091014A1 (ja) | 2004-10-21 |
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ID=33161532
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PCT/JP2004/004801 WO2004091014A1 (ja) | 2003-04-09 | 2004-04-01 | 電池用セパレータのための接着剤担多孔質フィルムとその利用 |
Country Status (5)
Country | Link |
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US (1) | US7833654B2 (ja) |
EP (2) | EP2306553A1 (ja) |
JP (1) | JP2004323827A (ja) |
KR (1) | KR101025187B1 (ja) |
WO (1) | WO2004091014A1 (ja) |
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- 2004-02-04 JP JP2004027681A patent/JP2004323827A/ja active Pending
- 2004-04-01 WO PCT/JP2004/004801 patent/WO2004091014A1/ja active Application Filing
- 2004-04-01 KR KR1020057019130A patent/KR101025187B1/ko active IP Right Grant
- 2004-04-01 US US10/552,486 patent/US7833654B2/en not_active Expired - Fee Related
- 2004-04-01 EP EP10010078A patent/EP2306553A1/en not_active Withdrawn
- 2004-04-01 EP EP04725201.0A patent/EP1650818B1/en not_active Expired - Lifetime
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017022454A1 (ja) * | 2015-08-04 | 2017-02-09 | オートモーティブエナジーサプライ株式会社 | リチウムイオン二次電池 |
CN111584807A (zh) * | 2019-02-18 | 2020-08-25 | 旭化成株式会社 | 蓄电装置用微多孔膜 |
CN111584807B (zh) * | 2019-02-18 | 2022-09-09 | 旭化成株式会社 | 蓄电装置用微多孔膜 |
CN111211275A (zh) * | 2020-01-14 | 2020-05-29 | 江苏厚生新能源科技有限公司 | 部分交联的复合聚乙烯锂电池隔膜及其制备方法 |
CN112635919A (zh) * | 2020-12-23 | 2021-04-09 | 江苏澳盛复合材料科技有限公司 | 一种柔性锂电池隔膜 |
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Also Published As
Publication number | Publication date |
---|---|
EP1650818A4 (en) | 2008-01-09 |
EP1650818B1 (en) | 2013-05-22 |
EP1650818A1 (en) | 2006-04-26 |
JP2004323827A (ja) | 2004-11-18 |
KR20060002959A (ko) | 2006-01-09 |
US7833654B2 (en) | 2010-11-16 |
EP2306553A1 (en) | 2011-04-06 |
US20070184340A1 (en) | 2007-08-09 |
KR101025187B1 (ko) | 2011-03-31 |
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