WO2016121630A1 - 多層耐熱セパレータ材およびその製造方法 - Google Patents
多層耐熱セパレータ材およびその製造方法 Download PDFInfo
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- WO2016121630A1 WO2016121630A1 PCT/JP2016/051786 JP2016051786W WO2016121630A1 WO 2016121630 A1 WO2016121630 A1 WO 2016121630A1 JP 2016051786 W JP2016051786 W JP 2016051786W WO 2016121630 A1 WO2016121630 A1 WO 2016121630A1
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- heat
- resistant
- separator material
- resistant separator
- film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/02—Diaphragms; Separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
- H01M50/434—Ceramics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/443—Particulate material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/494—Tensile strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
- Y02E60/13—Energy storage using capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Definitions
- the present invention relates to a multilayer heat-resistant separator material and a manufacturing method thereof.
- Polyolefin microporous membranes are used for separation membranes, battery separators, capacitors and the like.
- battery separator applications have attracted attention with the recent development of lithium ion batteries.
- the battery separator is a member that functions as a partition wall of the electrolyte, and at the same time, its ion permeability is a function that is directly linked to the charge / discharge capability of the battery.
- a battery separator made of a polyolefin microporous membrane and a sheet-like electrode are disposed inside the battery body in a state of being laminated or wound inside the battery body via an electrolyte layer.
- the multilayer heat-resistant separator material is manufactured by applying and drying a heat-resistant layer material containing inorganic particles and a binder on a base film such as a polyolefin microporous film.
- Patent Documents 1 and 2 describe a method for preventing curling when a heat-resistant layer mainly composed of an inorganic substance and a base material made of a resin are laminated.
- Patent Document 1 describes that curling is prevented by adjusting the thickness of a base film and a heat-resistant layer.
- Patent Document 2 describes that curling is prevented by providing a low pore region at a specific portion of a multilayer heat-resistant separator material.
- the base material of the multilayer separator material described in Patent Documents 1 and 2 is substantially a polyethylene microporous film, the multilayer separator material to which the curl prevention method described in Patent Documents 1 and 2 can be applied is limited. It has been.
- Patent Document 3 As described in Patent Document 3, the applicant of the present invention has already manufactured a multilayer heat-resistant separator material by applying a coating liquid containing an inorganic filler to a polyolefin microporous membrane product to form a heat-resistant layer. Has succeeded. However, the multilayer heat-resistant separator material described in Patent Document 3 has not been studied for curling prevention.
- the present invention is as follows.
- An inorganic heat-resistant layer is laminated on at least one side of a base film made of a polyolefin microporous film having an elongation of 2% or less when pulled at 10 N / mm 2 at 100 ° C., and the base film
- a multilayer heat-resistant separator material having a thickness of 10 to 30 ⁇ m, a thickness of one of the inorganic heat-resistant layers of 1 to 5 ⁇ m, and a curl height measured by the following method (a) of less than 10 mm.
- invention 2 The multilayer heat-resistant separator material according to Invention 1, wherein the polyolefin microporous membrane is a polyolefin microporous membrane obtained by microporousizing a polyolefin by a dry method including a cold stretching step and a warm stretching step.
- Invention 3 A polyolefin microporous membrane having an MFR (JIS K 6758, 230 ° C., load 21.18 N) of 0.1 to 1.0 g / 10 min, a melting point of 150 to 170 ° C., ethylene, 4 carbon atoms
- Invention 5 A method for producing a multilayer heat-resistant separator material comprising the following steps.
- Step 1 A step of producing a polyolefin microporous membrane having a thickness of 10 to 30 ⁇ m having an elongation of 2% or less when pulled at 10 N / mm 2 at 100 ° C.
- Step 2 A step of applying an inorganic heat-resistant layer agent containing inorganic heat-resistant particles and a binder to at least one surface of the base film made of the polyolefin microporous film obtained in Step 1.
- Step 3 A step of drying the inorganic heat-resistant layer agent by drying the film obtained in Step 2 at a temperature of 80 to 120 ° C. and a tensile force of 4 to 10 N / mm 2 .
- (Invention 6) The process for producing a multilayer heat-resistant separator material according to Invention 5, wherein in Step 1, the polyolefin is made into a microporous film by a dry method including a cold drawing step and a hot drawing step.
- MFR JIS K 6758, 230 ° C., load 21.18 N
- melting point is 150 to 150 ° C. by a dry method including a cold drawing step and a hot drawing step.
- a method for producing a multilayer heat-resistant separator material according to invention 5 or 6, wherein a propylene polymer which may contain at least one selected from ethylene and an ⁇ -olefin having 4 to 8 carbon atoms is formed into a microporous film at 170 ° C. (Invention 8) The method for producing a multilayer heat-resistant separator material according to any one of Inventions 5 to 7, wherein an inorganic heat-resistant layer agent containing alumina and a binder is used in Step 2.
- the curl of the multilayer heat-resistant separator of the present invention is limited to a practically no problem range.
- the multilayer heat-resistant separator material that has completed the above step 3 is stored on a flat table at 25 ° C. for 24 hours, even if the end of the separator material is lifted from the surface of the table due to curling, the length direction is 30 cm ⁇ In the rectangular sample of 20 cm in the width direction, the lifted portion (height from the table surface to the end) is suppressed to 10 mm or less.
- Such a multilayer heat-resistant separator material in which the occurrence of curling is suppressed has substantially no problem when processed into a battery separator material, and does not hinder battery performance.
- the multilayer heat-resistant separator material of the present invention is formed by laminating an inorganic heat-resistant layer on at least one side of a base film made of a polyolefin microporous film having an elongation of 2% or less when pulled at 10 N / mm 2 at 100 ° C.
- the thickness of the base film is 10 to 30 ⁇ m
- the thickness of one layer of the inorganic heat-resistant layer is 1 to 5 ⁇ m
- the curl height measured by the following method (a) is less than 10 mm.
- the height (mm) from the four corners of the sample is measured, and the average value (mm) of the four heights (mm) is calculated as the curl height (mm).
- the base film used in the present invention is a polyolefin microporous film.
- Polyolefin is a polymer obtained by polymerizing monomers mainly composed of olefins.
- Typical olefins are linear olefins having 2 to 10 carbon atoms. Along with these, branched olefins having 4 to 8 carbon atoms such as 2-methylpropene, 3-methyl-1-butene, 4-methyl-1-pentene, styrenes and dienes can be used in combination.
- Typical polyolefins are polymers called polyethylene and polypropylene.
- Polyethylene is an ethylene homopolymer or a polymer obtained by copolymerizing ethylene and a comonomer containing at least one selected from ⁇ -olefins having 3 to 8 carbon atoms.
- Polypropylene is a propylene homopolymer or a polymer obtained by copolymerizing propylene and a comonomer containing at least one selected from ethylene and an ⁇ -olefin having 4 to 8 carbon atoms.
- the raw material for the base film used in the present invention is preferably a highly crystalline and high melting point polypropylene.
- Particularly preferred polypropylene is ethylene having a melt mass flow rate (measured in accordance with MFR, JIS K6758 (230 ° C., 21.18 N)) of 0.1 to 1.0 g / 10 min and a melting point of 150 to 170 ° C.
- a propylene polymer which may contain at least one selected from ⁇ -olefins having 4 to 8 carbon atoms.
- the content of the comonomer may be in any range as long as the base film satisfies a predetermined elongation condition.
- the base film used in the present invention satisfies a specific elongation condition. That is, the elongation when a test piece made of a substrate film is pulled at 10 N / mm 2 using a tensile tester at 100 ° C. is in the range of 2% or less. Elongation (%) is obtained by the following formula.
- Elongation (%) [(Length of test piece after tension (mm)) ⁇ (Length of initial test piece (mm))] / (Length of initial test piece (mm)) ⁇ 100
- additives such as a crystal nucleating agent and a filler can be blended.
- the type and amount of the additive are not limited as long as the above conditions for elongation are satisfied and the porosity necessary for the base material of the separator material is not impaired.
- the base film used in the present invention may be any polyolefin microporous film that satisfies the above-described elongation conditions.
- a polyolefin microporous film produced by a so-called dry method which is advantageous in terms of cost because an organic solvent is not used, is preferable.
- a microporous membrane made of polyolefin a microporous membrane having a porosity of 45% or more manufactured by a dry method including the following film forming process, heat treatment process, cold stretching process, hot stretching process, and relaxation process Is particularly preferred.
- Frm forming process This is a process of forming a raw film by extruding the raw material.
- the raw material polyolefin is supplied to an extruder, the raw material polyolefin is melt-kneaded at a temperature equal to or higher than its melting point, and a film made of the raw material polyolefin is extruded from a die attached to the tip of the extruder.
- the extruder used is not limited.
- the extruder for example, any of a single screw extruder, a twin screw extruder, and a tandem type extruder can be used. Any die can be used as long as it is used for film forming.
- the dice for example, various T-type dice can be used.
- the thickness and shape of the raw film are not particularly limited.
- the ratio (draft ratio) between the die slip clearance and the raw film thickness is 100 or more, more preferably 150 or more.
- the thickness of the raw film is 10 to 200 ⁇ m, more preferably 15 to 100 ⁇ m.
- Heat treatment process It is a process of heat-treating the raw film after finishing the film forming process.
- a constant tension in the length direction is applied to the raw film at a temperature 5 to 65 ° C., preferably 10 to 25 ° C. lower than the melting point of the raw polyolefin.
- a preferable tension is such that the length of the raw film is more than 1.0 times and 1.1 times or less.
- the stretching temperature is ⁇ 5 ° C. to 45 ° C., preferably 5 ° C. to 30 ° C.
- the draw ratio is 1.0 to 1.1, preferably 1.00 to 1.08, more preferably 1.02 or more and less than 1.05 in the length direction. However, the draw ratio is greater than 1.0.
- the stretching means is not limited. Known means such as a roll stretching method and a tenter stretching method can be used. The number of stretching stages can be set arbitrarily. One-stage stretching may be performed, and two or more stages of stretching may be performed through a plurality of rolls.
- the molecules of the polypropylene polymer constituting the raw film are oriented.
- a stretched film having a lamellar portion with a dense molecular chain and a region (craze) with a loose molecular chain between lamellas is obtained.
- the stretching temperature is 5 to 65 ° C. lower than the melting point of the polypropylene polymer, preferably 10 to 45 ° C. lower than the melting point of the raw polyolefin.
- the draw ratio is 1.5 to 4.5 times in the length direction, preferably 2.0 to 4.0 times.
- the stretching means is not limited. Known means such as a roll stretching method and a tenter stretching method can be used.
- the number of stretching stages can be set arbitrarily. One-stage stretching may be performed, and two or more stages of stretching may be performed through a plurality of rolls. In the hot drawing process, the crazes generated in the cold drawing process are stretched and voids are generated.
- the relaxation process is a step of relaxing the film in order to prevent shrinkage of the stretched film after the hot stretching step.
- the relaxation temperature is slightly higher than the temperature of warm drawing, and is generally 0 to 20 ° C. higher.
- the degree of relaxation is adjusted so that the length of the stretched film after the relaxation process is finally 0.7 to 1.0 times.
- the final substrate film has a thickness of 15 to 30 ⁇ m, preferably 15 to 25 ⁇ m.
- the base film used in the present invention satisfies a specific elongation condition. That is, the elongation when a test piece made of a substrate film is pulled at 10 N / mm 2 using a tensile tester at 100 ° C. is in the range of 2% or less. Elongation (%) is obtained by the following formula.
- Elongation (%) [(Length of test piece after tension (mm)) ⁇ (Length of initial test piece (mm))] / (Length of initial test piece (mm)) ⁇ 100
- An inorganic heat resistant layer is formed on at least one side of the substrate film.
- the inorganic heat-resistant layer is formed by applying an inorganic heat-resistant layer agent containing inorganic heat-resistant particles, a binder, and a solvent to a base film, and drying and solidifying the coating liquid.
- an inorganic material having a primary particle diameter of 5 to 100 nm, a melting point of 200 ° C. or higher, high insulating properties and electrochemical stability is used.
- metal oxides such as alumina, silica, titania, zirconia, magnesia, barium titanate, metal hydroxides such as aluminum hydroxide and magnesium hydroxide, boehmite, talc, kaolin, zeolite, apatite, halloysite, pyro Clay-based minerals such as phyllite, montmorillonite, sericite, mica, amicite, bentonite, calcium silicate, magnesium silicate are used.
- a mixture comprising a plurality of inorganic heat resistant particles can also be used.
- Preferred inorganic heat resistant particles are alumina, silica, titania and boehmite.
- the binder functions as a binder between the base material and the inorganic heat resistant particles.
- various resins such as polyolefin, fluorine-containing resin, rubber or elastomer, celluloses, and water-soluble resin can be used.
- Preferred binders are polytetrafluoroethylenes (PTFE) and polyvinyl fluorides (PVDF).
- the amount ratio of inorganic heat resistant particles and binder is generally in the range of 40:60 to 98: 2, preferably 50:50 to 95: 5, more preferably 60. : In the range of 40 to 90:10.
- a solvent is usually added to the inorganic heat-resistant layer agent.
- polar organic solvents such as water or acetone, N-methylpyrrolidone, dimethylacetamide, dimethylformamide, dimethylsulfoxide and the like can be used.
- additives such as a dispersant, an antibacterial agent and a fungicide can be added to the inorganic heat-resistant layer agent as necessary.
- the raw materials such as inorganic heat-resistant particles, binders, solvents and additives as described above are mixed and stirred to adjust the inorganic heat-resistant layer agent.
- the means for mixing and stirring is not limited. Usually, a homogenizer, a bead mill, or a jet mill is used.
- the method for producing a multilayer heat-resistant separator material of the present invention includes the following steps 1 to 3.
- Process 1 This is a step of producing a polyolefin microporous membrane having a thickness of 10 to 30 ⁇ m and an elongation of 2% or less when pulled at 10 N / mm 2 at 100 ° C.
- the raw material of the polyolefin microporous membrane and the production method thereof are as described above.
- an inorganic heat-resistant layer agent containing inorganic heat-resistant particles and a binder is applied to at least one surface of the base film made of the polyolefin microporous film obtained in Step 1.
- the coating means is not limited.
- any means can be used as long as it is a means for applying a liquid material in the form of a flat film, such as a gravure coater, a micro gravure coater, a die coater, or a knife coater.
- the inorganic heat resistant layer agent is applied so that the thickness of the inorganic heat resistant layer agent provided on one surface of the base film is 1 to 5 ⁇ m, preferably 1.5 to 4.0 ⁇ m.
- step 3 the film obtained in step 2 is dried at a temperature of 80 to 120 ° C. and a tensile force of 4 to 10 N / mm 2 to dry the inorganic heat-resistant layer agent. With drying, the inorganic heat resistant layer agent solidifies to form an inorganic heat resistant layer.
- step 3 an inorganic heat-resistant layer having a thickness of 1 to 5 ⁇ m, preferably 1.5 to 4 ⁇ m, is formed.
- the multilayer heat-resistant separator material of the present invention is completed.
- Process 4 It is a winding process of the completed multilayer heat-resistant separator material. Usually after step 3.
- the multilayer heat-resistant separator material of the present invention obtained in step 3 is wound up on a roll and stored until packaging and shipment. Usually, a film having a length of several tens of meters to several hundreds of meters is wound around one roll core.
- a propylene polymer having a melt mass flow rate (MFR) measured in accordance with JIS K6758 (230 ° C., 21.18 N) of 0.5 g / 10 min and a melting point of 165 ° C. was used as a raw material.
- MFR melt mass flow rate
- the raw film was heat-treated at 150 ° C.
- the raw film was cold-stretched 1.03 times in the length direction at 30 ° C.
- a propylene polymer having a melt mass flow rate (MFR) measured according to JIS K6758 (230 ° C., 21.18 N) of 1.5 g / 10 minutes and a melting point of 158 ° C. was used as a raw material.
- MFR melt mass flow rate
- the raw film was heat-treated at 150 ° C.
- the raw film was cold-stretched 1.03 times in the length direction at 30 ° C.
- the stretching heater temperature was maintained at 175 ° C., and the obtained stretched film was warm-stretched 3.2 times in the length direction.
- the length of the obtained stretched film was relaxed so as to be 0.88 times.
- the obtained microporous film was used as a comparative base film B in comparative examples described later.
- inorganic heat-resistant layer agent C Al 2 O 3 (AEROXIDE AluC manufactured by Nippon Aerosil Co., Ltd.) was used as the inorganic heat-resistant particles, and polyvinylidene fluoride (Kyner HSV 500 manufactured by Arkema Co., Ltd.) was used as the binder.
- inorganic heat-resistant particles weight concentration 9%
- a binder weight concentration 3%) were added to N-methylpyrrolidone (NMP) as a solvent, and the mixture was stirred for 1 hour at 500 rpm with a disper.
- NMP N-methylpyrrolidone
- the obtained slurry was treated once with a high pressure treatment apparatus (Nanovater manufactured by Yoshida Kikai Kogyo Co., Ltd.) at a treatment pressure of 200 MPa and mixed, and the inorganic heat resistant layer agent in which the inorganic heat resistant particles and the binder were uniformly dispersed. C was obtained.
- a high pressure treatment apparatus Nanovater manufactured by Yoshida Kikai Kogyo Co., Ltd.
- Example 1 Base film A was produced as described above.
- Step 2 An inorganic heat-resistant layer agent C was applied to one side of the base film A with a gravure coater. The thickness of the coated inorganic heat-resistant layer agent was 4 ⁇ m.
- Step 3 A tension of 4.4 N / mm 2 was applied to the base film coated with the inorganic heat-resistant layer agent and conveyed in a drying furnace at a temperature of 95 ° C. to dry and solidify the inorganic heat-resistant layer agent.
- a multilayer heat-resistant separator material of the method of the present invention was obtained.
- the occurrence of curling of the multilayer heat-resistant separator material was evaluated by the following method. Table 1 shows the conditions of Steps 1 to 3 and the evaluation results of curling.
- test piece of (length (MD) direction 30 cm) ⁇ (width (TD) direction 20 cm) was cut out from the multilayer heat-resistant separator material.
- the test piece was left in an atmosphere at 25 ° C. for 24 hours. Thereafter, it was visually determined which surface of the test piece was contracted to cause curling.
- the test piece was placed on a horizontal table so that the contracted surface became the upper surface, and the four corners of the sample were separated from the table. That is, when viewed from the side, the test piece was curled in a valley shape on the table.
- the height (mm) from each of the four corners was measured.
- the height (mm) was an integer value rounded off after the decimal point.
- the height value is 0 mm.
- the average value (mm) of the four heights (mm) is the curl height. Calculated as (mm). When the curl height is 10 mm or more, it is determined as a rejected product.
- Examples 2 to 9 The multilayer heat-resistant separator material of the present invention was produced by changing the conditions of Steps 1 to 3 in Example 1.
- Table 1 shows the conditions of each step 1 to 3 and the evaluation results of curling.
- Comparative Examples 1 to 9 A comparative multilayer heat-resistant separator material was produced by changing the conditions of Steps 1 to 3 in Example 1. Table 1 shows the conditions of each step 1 to 3 and the evaluation results of curling.
- the present invention curling of the multilayer heat-resistant separator material can be prevented.
- the multilayer heat-resistant separator material in which curling is suppressed according to the present invention is advantageous for battery assembly process and battery performance.
- the multilayer heat-resistant separator material of the present invention can be expected as an excellent battery separator material.
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Abstract
Description
(発明1)100℃において10N/mm2で引張したときの伸びが2%以下であるポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に無機耐熱層を積層してなり、上記基材フィルムの厚みが10~30μm、上記無機耐熱層の1層の厚みが1~5μmであって、以下の方法(a)により測定したカール高さが10mm未満である、多層耐熱セパレータ材。
カール高さの測定方法(a):多層耐熱セパレータ材から切り出した長さ方向30cm×幅方向20cmの長方形のサンプルを25℃雰囲気下に24時間静置した後、収縮した表面側が上面になるように水平な台に置き、サンプルの四隅の台からの高さ(mm)を測定し、4つの高さ(mm)の平均値(mm)をカール高さ(mm)として算出する。
(発明2)ポリオレフィン製微多孔膜が、ポリオレフィンを冷延伸工程と温延伸工程を含む乾式法により微多孔化して得られるポリオレフィン製微多孔膜である、発明1の多層耐熱セパレータ材。
(発明3)ポリオレフィン製微多孔膜が、MFR(JIS K 6758、230℃、荷重21.18N)が0.1~1.0g/10分、融点が150~170℃の、エチレン、炭素数4~8のα-オレフィンから選ばれる少なくとも1種を含んでよいプロピレン重合体である、発明1または2の多層耐熱セパレータ材。
(発明4)無機耐熱層がアルミナとバインダーを含む、発明1~3のいずれかの多層耐熱セパレータ材。
(発明5)以下の工程を含む、多層耐熱セパレータ材の製造方法。
(工程1)100℃において10N/mm2で引張したときの伸びが2%以下である、厚みが10~30μmのポリオレフィン製微多孔膜を製造する工程。
(工程2)工程1で得られたポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に、無機耐熱粒子とバインダーとを含む無機耐熱層剤を塗工する工程。
(工程3)工程2で得られたフィルムを、80~120℃の温度下、かつ、4~10N/mm2の引張力下で乾燥させて、無機耐熱層剤を乾燥する工程。
(発明6) 工程1で、冷延伸工程と温延伸工程を含む乾式法によってポリオレフィンを微多孔膜化する、発明5の多層耐熱セパレータ材の製造方法。
(発明7) 工程1で、冷延伸工程と温延伸工程を含む乾式法によってMFR(JIS K 6758、230℃、荷重21.18N)が0.1~1.0g/10分、融点が150~170℃の、任意にエチレン、炭素数4~8のα-オレフィンから選ばれる少なくとも1種を含んでよいプロピレン重合体を微多孔膜化する、発明5または6の多層耐熱セパレータ材の製造方法。
(発明8) 工程2でアルミナとバインダーを含む無機耐熱層剤を使用する、発明5~7のいずれかの多層耐熱セパレータ材の製造方法。
本発明の多層耐熱セパレータ材は、100℃において10N/mm2で引張したときの伸びが2%以下であるポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に無機耐熱層を積層してなり、上記基材フィルムの厚みが10~30μm、上記無機耐熱層の1層の厚みが1~5μmであって、以下の方法(a)により測定したカール高さが10mm未満である。
カール高さの測定方法(a):多層耐熱セパレータ材から切り出した長さ方向30cm×幅方向20cmの長方形のサンプルを25℃雰囲気下に24時間静置した後、収縮した表面側が上面になるように水平な台に置き、サンプルの四隅の台からの高さ(mm)を測定し、4つの高さ(mm)の平均値(mm)をカール高さ(mm)として算出する。
本発明で用いる基材フィルムはポリオレフィン製微多孔膜である。ポリオレフィンはオレフィン類を主体とするモノマーを重合して得られる重合体である。オレフィン類としては、炭素数2~10の直鎖状オレフィン類が代表的である。これらと共に、2-メチルプロペン、3-メチル-1-ブテン、4-メチル-1-ペンテンなどの炭素数4~8の分岐状オレフィン類、スチレン類、ジエン類を併用することができる。代表的なポリオレフィンは、ポリエチレン、ポリプロピレンと称される重合体である。ポリエチレンはエチレン単独重合体かあるいはエチレンと炭素数3~8のα-オレフィンから選ばれる少なくとも1種を含むコモノマーとを共重合して得られる重合体である。ポリプロピレンは、プロピレン単独重合体か、あるいは、プロピレンと、エチレン及び炭素数4~8のα-オレフィンから選ばれる少なくとも1種を含むコモノマーとを共重合して得られる重合体である。
本発明で用いる基材フィルムは、上述の伸び条件を満たすポリオレフィン製微多孔膜であれば、いかなるものでもよい。このような基材フィルムとしては、有機溶媒を用いないためコスト面で有利な、いわゆる乾式法によって製造されたポリオレフィン製微多孔膜が好ましい。そのようなポリオレフィン製微多孔膜としては、以下の製膜工程、熱処理工程、冷延伸工程、温延伸工程、弛緩工程を含む乾式法で製造された、空孔率が45%以上の微多孔膜が特に好ましい。
原料を押出成形して原反フィルムを製膜する工程である。原料ポリオレフィンを押出機に供給し、原料ポリオレフィンをその融点以上の温度で溶融混練し、押出機の先端に取り付けたダイスから原料のポリオレフィンからなるフィルムを押出す。使用される押出機は限定されない。押出機としては、例えば、単軸押出機、二軸押出機、タンデム型押出機のいずれもが使用可能である。使用されるダイスはフィルム成形に用いられるものであれば、いずれも使用できる。ダイスとしては、例えば、各種T型ダイス使用することができる。原反フィルムの厚みや形状は特に限定されない。好ましくは、ダイスリップクリアランスと原反フィルム厚さの比(ドラフト比)は100以上、さらに好ましくは150以上である。好ましくは、原反フィルムの厚みは10~200μm、さらに好ましくは15~100μmである。
製膜工程を終えた原反フィルムを熱処理する工程である。原料ポリオレフィンの融点よりも5~65℃、好ましくは10~25℃低い温度で、原反フィルムに長さ方向の一定の張力を加える。好ましい張力は、原反フィルムの長さが1.0倍を超え1.1倍以下となる大きさである。
熱処理工程を終えた原反フィルムを比較的低い温度で延伸する工程である。延伸温度は-5℃~45℃、好ましくは5℃~30℃である。延伸倍率は、長さ方向に1.0~1.1、好ましくは1.00~1.08、さらに好ましくは1.02以上1.05未満である。ただし、延伸倍率は1.0倍より大きい。延伸手段は制限されない。ロール延伸法、テンター延伸法などの公知の手段が使用できる。延伸の段数は任意に設定できる。1段延伸でもよく、複数のロールを経て2段以上の延伸を行ってもよい。冷延伸工程で、原反フィルムを構成するポリプロピレン系重合体の分子が配向する。その結果、分子鎖が密なラメラ部と、ラメラ間の分子鎖が疎な領域(クレーズ)とを有する延伸フィルムが得られる。
冷延伸工程を終えた延伸フィルムを比較的高い温度で延伸する工程である。延伸温度はポリプロピレン系重合体の融点よりも5~65℃低い温度、好ましくは原料ポリオレフィンの融点よりも10~45℃低い温度である。延伸倍率は、長さ方向に1.5~4.5倍、好ましくは2.0~4.0倍である。延伸手段は制限されない。ロール延伸法、テンター延伸法などの公知の手段が使用できる。延伸の段数は任意に設定できる。1段延伸でもよく、複数のロールを経て2段以上の延伸を行ってもよい。温延伸工程で冷延伸工程で生じたクレーズが引き延ばされ、空孔が発生する。
温延伸工程を終えた延伸フィルムの収縮を防ぐためにフィルムを弛緩させる工程である。弛緩温度は、温延伸の温度よりもやや高い温度であり、0~20℃高い温度が一般的である。弛緩の度合いは、弛緩工程を終えた延伸フィルムの長さが最終的に0.7~1.0倍になるように調整される。こうして本発明で用いる基材フィルムが完成する。最終的な基材フィルムの厚みは15~30μm、好ましくは15~25μmである。
本発明で用いる基材フィルムは、特定の伸び条件を満たす。すなわち、基材フィルムからなる試験片を100℃において引張試験機を用いて10N/mm2で引張したときの伸びが2%以下の範囲にある。伸び(%)は以下の式で求められる。
上記基材フィルムの少なくとも片面に無機耐熱層が形成される。無機耐熱層は、無機耐熱粒子、バインダー、溶媒を含む無機耐熱層剤を基材フィルムに塗布し、塗工液を乾燥・固化させることによって形成される。
本発明の多層耐熱セパレータ材の製造方法は、以下の工程1~3を含む。
(工程1)
100℃において10N/mm2で引張したときの伸びが2%以下である、厚みが10~30μmのポリオレフィン製微多孔膜を製造する工程である。ポリオレフィン製微多孔膜の原料とその製造方法は、上述の通りである。
工程1で得られたポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に、無機耐熱粒子とバインダーとを含む無機耐熱層剤を塗工する工程である。塗工手段は限定されない。例えば、グラビアコーター、マイクログラビアコーター、ダイコーター、ナイフコーターなど、液状物を平面フィルム状に塗布する手段であればいずれも用いることができる。工程2では、基材フィルムの一つの面に設けられた無機耐熱層剤の厚みが1~5μm、好ましくは1.5~4.0μmになるように、無機耐熱層剤を塗工する。
工程2で得られたフィルムを、80~120℃の温度下、かつ、4~10N/mm2の引張力下で乾燥させて、無機耐熱層剤を乾燥する工程である。乾燥に伴い、無機耐熱層剤が固化して無機耐熱層を形成する。工程3を終了すると、1層の厚みが1~5μm、好ましくは1.5~4μmの無機耐熱層が形成される。こうして本発明の多層耐熱セパレータ材が完成する。
完成した多層耐熱セパレータ材の巻取り工程である。通常、工程3の後に行う。工程3で得られた本発明の多層耐熱セパレータ材はロールに巻き取られて、包装、出荷まで保管される。通常、数十mから数百mの長さのフィルムが1つのロール芯に巻き取られる。
原料として、JIS K6758(230℃、21.18N)に従い測定したメルトマスフローレイト(MFR)が0.5g/10分、融点が165℃のプロピレン重合体を使用した。
(1)単軸押出機で溶融混練した原料をドラフト比206でTダイから押出し、厚さ17μmの原反フィルムを製造した。
(2)次いで、原反フィルムを150℃で熱処理した。
(3)原反フィルムを30℃で長さ方向に1.03倍に冷延伸した。
(4)延伸ヒータ温度を230℃に維持し、工程3得られた延伸フィルムを長さ方向に2.8倍に温延伸した。
(5)得られた延伸フィルムの長さが0.88倍になるように弛緩させた。こうして空孔率が45%を超える微多孔膜が得られた。得られた微多孔フィルムを、基材フィルムAとして後述の実施例、比較例に用いた。
得られた微多孔フィルムから、(フィルム長さ(MD)方向 120mm)x(フィルム幅(TD)方向 10mm)の帯状試験片を5枚切りだした。100℃恒温槽中で島津製作所製引張試験機(オートグラフ AGS-X)を用いて、試験片1枚に引張力を負荷した。引張条件は、初期チャック間距離:50mm、引張速度:50mm/分、引張方向:試験片MD方向、最大引張力:10N/mm2(フィルム断面積あたりの引張力)とした。引張力が10N/mm2になった時点での試験片のMD方向の長さ(MD-max)(mm)と引張前の試験片のMD方向の長さ(120mm)を用いて、以下の式により試験片の伸び(%)を算出した。
伸び(%)=((MD-max)-120)÷120×100
5枚の試験片について上と同じ手順で伸び(%)を求めた。5つの試験片の伸び(%)の平均値を基材フィルムAの伸び(%)として算出した。基材フィルムAの伸びは1.7%であった。
原料として、JIS K6758(230℃、21.18N)に従い測定したメルトマスフローレイト(MFR)が1.5g/10分、融点が158℃のプロピレン重合体を使用した。
(1)単軸押出機で溶融混練した原料をドラフト比205でTダイから押出し、厚さ22μmの原反フィルムを製造した。
(2)次いで、原反フィルムを150℃で熱処理した。
(3)原反フィルムを30℃で長さ方向に1.07倍に冷延伸した。
(4)延伸ヒータ温度を175℃に維持し、得られた延伸フィルムを長さ方向に3.2倍に温延伸した。
(5)得られた延伸フィルムの長さが0.88倍になるように弛緩させた。こうして空孔率が45%を超える微多孔膜が得られた。得られた微多孔フィルムを、比較用基材フィルムBとして後述の比較例に用いた。
基材フィルムAと同じ手順で基材フィルムBの伸びを求めたところ、2.4%であった。
無機耐熱粒子としてAl2O3(日本アエロジル(株)社製 AEROXIDE AluC)、バインダーとしてポリフッ化ビニリデン(アルケマ(株)社製 Kyner HSV 500)を用いた。まず溶媒であるN-メチルピロリドン(NMP)に無機耐熱粒子(重量濃度9%)とバインダー(重量濃度3%)を加え、ディスパーを用いて回転数500rpmにて1時間攪拌を実施した。更に、得られたスラリーを高圧処理装置(吉田機械興業(株)製 Nanovater)を用いて200MPaの処理圧にて1回処理を行い混合、無機耐熱粒子とバインダーが均一に分散した無機耐熱層剤Cを得た。
(工程1)上述の通り、基材フィルムAを製造した。
(工程2)基材フィルムAの片面に無機耐熱層剤Cをグラビアコーターで塗工した。塗工された無機耐熱層剤の厚みは4μmであった。
(工程3)無機耐熱層剤が塗工された基材フィルムに張力4.4N/mm2を与えて温度95℃の乾燥炉中で搬送し、無機耐熱層剤を乾燥・固化した。こうして本発明の方法の多層耐熱セパレータ材が得られた。以下の方法でこの多層耐熱セパレータ材のカール発生を評価した。
工程1~3の条件、カール発生の評価結果を、表1に示す。
多層耐熱セパレータ材から(長さ(MD)方向30cm)×(幅(TD)方向20cm)の長方形の試験片を切り出した。試験片を25℃雰囲気に24時間静置した。その後、試験片のいずれの面が収縮してカールが発生しているかを目視判定した。収縮した面が上面になるように試験片を水平な台に置き、サンプルの四隅を台から離した。すなわち横から見て試験片が台の上で谷型にカールしている状態とした。4隅それぞれの台からの高さ(mm)を測定した。高さ(mm)は、小数点以下を四捨五入した整数値とした。(例えば一つの隅の台からの高さが0.1mmの場合には、0mmを高さの値とする。)最後に、4つの高さ(mm)の平均値(mm)をカール高さ(mm)として算出した。カール高さが10mm以上の場合には不合格品と判定する。
実施例1の工程1~3の条件を変更して本発明の多層耐熱セパレータ材を製造した。それぞれの工程1~3の条件、カール発生の評価結果を、表1に示す。
実施例1の工程1~3の条件を変更して比較用の多層耐熱セパレータ材を製造した。それぞれの工程1~3の条件、カール発生の評価結果を、表1に示す。
Claims (8)
- 100℃において10N/mm2で引張したときの伸びが2%以下であるポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に無機耐熱層を積層してなり、上記基材フィルムの厚みが10~30μm、上記無機耐熱層の1層の厚みが1~5μmであって、以下の方法(a)により測定したカール高さが10mm未満である、多層耐熱セパレータ材。
カール高さの測定方法(a):
多層耐熱セパレータ材から切り出した長さ方向30cm×幅方向20cmの長方形のサンプルを25℃雰囲気下に24時間静置した後、収縮した表面側が上面になるように水平な台に置き、サンプルの四隅の台からの高さ(mm)を測定し、4つの高さ(mm)の平均値(mm)をカール高さ(mm)として算出する。 - ポリオレフィン製微多孔膜が、ポリオレフィンを冷延伸工程と温延伸工程を含む乾式法により微多孔化して得られるポリオレフィン製微多孔膜である、請求項1に記載の多層耐熱セパレータ材。
- ポリオレフィン製微多孔膜が、MFR(JIS K 6758、230℃、荷重21.18N)が0.1~1.0g/10分、融点が150~170℃の、エチレン、炭素数4~8のα-オレフィンから選ばれる少なくとも1種を含んでよいプロピレン重合体である、請求項1または2に記載の多層耐熱セパレータ材。
- 無機耐熱層がアルミナとバインダーを含む、請求項1~3のいずれか1項に記載の多層耐熱セパレータ材。
- 以下の工程を含む、多層耐熱セパレータ材の製造方法。
(工程1)100℃において10N/mm2で引張したときの伸びが2%以下である、厚みが10~30μmのポリオレフィン製微多孔膜を製造する工程。
(工程2)工程1で得られたポリオレフィン製微多孔膜からなる基材フィルムの少なくとも片面に、無機耐熱粒子とバインダーとを含む無機耐熱層剤を塗工する工程。
(工程3)工程2で得られたフィルムを、80~120℃の温度下、かつ、4~10N/mm2の引張力下で乾燥させて、無機耐熱層剤を乾燥する工程。 - 工程1で、冷延伸工程と温延伸工程を含む乾式法によってポリオレフィンを微多孔膜化する、請求項5に記載の多層耐熱セパレータ材の製造方法。
- 工程1で、冷延伸工程と温延伸工程を含む乾式法によってMFR(JIS K 6758、230℃、荷重21.18N)が0.1~1.0g/10分、融点が150~170℃の、任意にエチレン、炭素数4~8のα-オレフィンから選ばれる少なくとも1種を含んでよいプロピレン重合体を微多孔膜化する、請求項5または6に記載の多層耐熱セパレータ材の製造方法。
- 工程2でアルミナとバインダーを含む無機耐熱層剤を使用する、請求項5~7のいずれか1項に記載の多層耐熱セパレータ材の製造方法。
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| EP16743233.5A EP3252850B1 (en) | 2015-01-30 | 2016-01-22 | Multilayered heat-resistant separator element and method for manufacturing same |
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| JP6187650B2 (ja) * | 2015-08-12 | 2017-08-30 | 宇部興産株式会社 | 積層多孔質フィルム、蓄電デバイス用セパレータおよび蓄電デバイス |
| CN107241918A (zh) * | 2016-01-29 | 2017-10-10 | 住友化学株式会社 | 电池用隔膜、非水电解液二次电池用隔离物及非水电解液二次电池 |
| JP6551343B2 (ja) * | 2016-08-31 | 2019-07-31 | Jnc株式会社 | ポリプロピレン系微多孔膜の製造方法 |
| JP7055663B2 (ja) | 2017-03-03 | 2022-04-18 | 住友化学株式会社 | フィルム製造方法、セパレータ製造方法および可塑剤製造方法 |
| CN116169431A (zh) * | 2018-01-24 | 2023-05-26 | 帝人株式会社 | 非水系二次电池用隔膜及非水系二次电池 |
| JP7067378B2 (ja) * | 2018-09-06 | 2022-05-16 | 東レ株式会社 | セパレータ |
| CN112909428B (zh) * | 2021-01-26 | 2023-04-21 | 南京捷纳思新材料有限公司 | 一种电池隔膜及其制备方法 |
| CN114243218B (zh) * | 2022-02-25 | 2022-05-06 | 湖南中锂新材料科技有限公司 | 一种膜面平整的隔膜及其制备方法和应用 |
| CN121511201A (zh) * | 2023-12-27 | 2026-02-10 | 株式会社Lg新能源 | 隔膜卷绕卷、隔膜卷绕卷制造方法、电极组件制造装置和电极组件制造方法 |
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| CN107210413A (zh) | 2017-09-26 |
| KR20170107523A (ko) | 2017-09-25 |
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