WO2022131878A1 - 가교구조 함유 폴리올레핀 다공성 기재, 이의 제조 방법, 및 이를 포함하는 리튬 이차전지용 가교구조 함유 분리막 - Google Patents
가교구조 함유 폴리올레핀 다공성 기재, 이의 제조 방법, 및 이를 포함하는 리튬 이차전지용 가교구조 함유 분리막 Download PDFInfo
- Publication number
- WO2022131878A1 WO2022131878A1 PCT/KR2021/019349 KR2021019349W WO2022131878A1 WO 2022131878 A1 WO2022131878 A1 WO 2022131878A1 KR 2021019349 W KR2021019349 W KR 2021019349W WO 2022131878 A1 WO2022131878 A1 WO 2022131878A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyolefin
- porous substrate
- antioxidant
- crosslinked structure
- polyolefin porous
- Prior art date
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- 229920000098 polyolefin Polymers 0.000 title claims abstract description 572
- 239000000758 substrate Substances 0.000 title claims abstract description 247
- 238000000034 method Methods 0.000 title claims abstract description 87
- 229910052744 lithium Inorganic materials 0.000 title claims description 115
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- -1 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5, 5] undecane (3,9-Bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane) Chemical group 0.000 claims description 80
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- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 14
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- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
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- 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
- H01M50/454—Separators, membranes or diaphragms characterised by the material having a layered structure comprising a non-fibrous layer and a fibrous layer superimposed on one another
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/202—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising elimination of a solid or a liquid ingredient
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
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- 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
- H01M50/446—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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
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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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a polyolefin porous substrate containing a crosslinked structure, and a method for preparing the same.
- the present invention relates to a separator containing a crosslinked structure for a lithium secondary battery comprising the polyolefin porous substrate containing the crosslinked structure, and a lithium secondary battery including the same.
- a lithium secondary battery is a battery that can best meet these needs, and research on it is being actively conducted.
- This lithium secondary battery consists of a positive electrode, a negative electrode, an electrolyte, and a separator, among which the separator has high ionic conductivity to increase lithium ion permeability based on insulation and high porosity to separate and electrically insulate the positive and negative electrodes. is required
- a polyolefin separation membrane to which a porous substrate formed of polyolefin is applied is widely used.
- PE polyethylene
- Tm melting point
- the meltdown phenomenon refers to the temperature at which the separator completely melts and loses the insulating function between the anode and the cathode.
- the melt-down temperature should be high.
- the shutdown temperature refers to the temperature at which the pores of the separator close when the temperature of the battery rises.
- the problem to be solved by the present invention is to provide a polyolefin porous substrate containing a crosslinked structure with improved high-temperature stability due to a high melt-down temperature and a low shutdown temperature, and a method for manufacturing the same.
- Another problem to be solved by the present invention is to provide a separator containing a cross-linked structure for a lithium secondary battery with improved high-temperature stability due to a high melt-down temperature and a low shutdown temperature, and a lithium secondary battery having the same.
- a polyolefin porous substrate containing a crosslinked structure of the following embodiments.
- It relates to a polyolefin porous substrate containing a crosslinked structure, characterized in that the crosslinking degree difference between the polyolefin included in the first region and the polyolefin included in the second region is 10% or more.
- It may further include a third area extending in the other surface direction outside the second area,
- a crosslinking degree difference between the polyolefin included in the second region and the polyolefin included in the third region may be 10% or more.
- a third embodiment according to the first or second embodiment,
- a crosslinking degree difference between the polyolefin included in the first region and the polyolefin included in the second region may be 20% or more.
- a fourth embodiment according to any one of the first to third embodiments,
- a degree of crosslinking of the polyolefin included in the first region may be greater than a degree of crosslinking of the polyolefin included in the second region.
- a fifth embodiment according to any one of the first to fourth embodiments,
- the degree of crosslinking of the polyolefin included in the first region may be 20% or more.
- the degree of crosslinking of the polyolefin included in the first region may be 30% or more.
- a seventh embodiment according to any one of the first to sixth embodiments,
- a degree of crosslinking of the polyolefin included in the second region may be 0.1% to 10%.
- the first region may be 10% to 80% of the total thickness of the polyolefin porous substrate.
- a ninth embodiment according to any one of the second to eighth embodiments,
- a crosslinking degree difference between the polyolefin included in the second region and the polyolefin included in the third region may be 20% or more.
- a degree of crosslinking of the polyolefin included in the third region may be greater than a degree of crosslinking of the polyolefin included in the second region.
- a degree of crosslinking of the polyolefin included in the third region may be 20% or more.
- the degree of crosslinking of the polyolefin included in the third region may be 30% or more.
- the second region may be 10% to 60% of the total thickness of the polyolefin porous substrate.
- a fourteenth embodiment according to any one of the first to thirteenth embodiments,
- the rate of change in puncture strength may be 10% or less.
- a separator containing a cross-linked structure for a lithium secondary battery of the following embodiments there is provided a separator containing a cross-linked structure for a lithium secondary battery of the following embodiments.
- It relates to a separator containing a crosslinked structure for a lithium secondary battery, comprising the polyolefin porous substrate having a crosslinked structure according to any one of the first to fourteenth embodiments.
- the cross-linked structure-containing separator for lithium secondary batteries is positioned on at least one surface of the cross-linked structure-containing polyolefin porous substrate, and may further include an inorganic hybrid pore layer including an inorganic filler and a binder polymer.
- the cross-linked structure-containing separator for lithium secondary batteries is positioned on at least one surface of the cross-linked structure-containing polyolefin porous substrate, and an inorganic material hybrid pore layer including an inorganic filler and a first binder polymer;
- a porous adhesive layer positioned on the inorganic hybrid pore layer and including a second binder polymer; may further include.
- the melt-down temperature of the separator containing a cross-linked structure for a lithium secondary battery may be 160° C. or higher.
- a nineteenth embodiment according to any one of the fifteenth to eighteenth embodiments,
- a shutdown temperature of the separator containing a cross-linked structure for a lithium secondary battery may be 146° C. or less.
- step (S3) manufacturing a polyolefin porous substrate by molding and stretching the resultant product of step (S2) in a sheet form;
- step (S6) applying a photoinitiator composition comprising a photoinitiator to the resultant of step (S5);
- It relates to a method for producing a polyolefin porous substrate containing a crosslinked structure according to the first to third embodiments, characterized in that the antioxidant is contained in an amount of 0.8 parts by weight or more based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- the antioxidant may include a first antioxidant that is a radical scavenger and a second antioxidant that is a peroxide decomposer.
- 0.5 parts by weight or more of the first antioxidant may be included based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- the twenty-third embodiment is according to the twenty-first embodiment or the twenty-second embodiment.
- 0.3 parts by weight or more of the second antioxidant may be included based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- the first polyolefin composition may further include an antioxidant.
- the antioxidant may be included in an amount of 0.2 parts by weight or less.
- the twenty-sixth embodiment is according to the twenty-fourth or twenty-fifth embodiment
- the antioxidant may be included in an amount of 0.07 parts by weight to 0.2 parts by weight.
- the twenty-seventh embodiment is according to any one of the twenty-fourth to twenty-sixth embodiments,
- the antioxidant included in the first polyolefin composition may include a third antioxidant that is a radical scavenger and a fourth antioxidant that is a peroxide decomposer.
- the third antioxidant may be included in an amount of 0.05 to 0.1 parts by weight based on 100 parts by weight of the polyolefin included in the first polyolefin composition.
- the twenty-ninth embodiment is according to the twenty-seventh embodiment or the twenty-eighth embodiment
- the fourth antioxidant may be included in an amount of 0.02 to 0.1 parts by weight based on 100 parts by weight of the polyolefin included in the first polyolefin composition.
- the thirtieth embodiment is according to any one of the twentieth to twenty-ninth embodiments,
- the step (S2) may include co-extruding so that the extrusion result of the first polyolefin composition, the extrusion result of the second polyolefin composition, and the extrusion result of the first polyolefin composition are laminated.
- the photoinitiator may include a Type 2 photoinitiator.
- the photoinitiator may include thioxanthone (TX: Thioxanthone), a thioxanthone derivative, benzophenone (BPO: Benzophenone), a benzophenone derivative, or two or more of these.
- TX Thioxanthone
- BPO benzophenone
- the thirty-third embodiment is according to any one of the twentieth to thirty-two embodiments.
- the content of the photoinitiator may be 0.01 to 0.5% by weight based on 100% by weight of the photoinitiator composition.
- the first antioxidant may include a phenol-based antioxidant, an amine-based antioxidant, or a mixture thereof.
- the second antioxidant may include a phosphorus-based antioxidant, a sulfur-based antioxidant, or a mixture thereof.
- the third antioxidant may include a phenol-based antioxidant, an amine-based antioxidant, or a mixture thereof.
- the thirty-seventh embodiment is according to any one of the 27th to 36th embodiments.
- the fourth antioxidant may include a phosphorus antioxidant, a sulfur antioxidant, or a mixture thereof.
- the phenolic antioxidant is 2,6-di-t-butyl-4-methylphenol, 4,4'-thiobis(2-t-butyl-5-methylphenol), 2,2'-thiodiethylbis -[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], pentaerythritol-tetrakis-[3-(3,5-di-t-butyl-4- Hydroxyphenyl) -propionate] (Pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), 4,4'-thiobis (2-methyl-6-t-butyl phenol), 2,2′-thiobis(6-t-butyl-4-methylphenol), octadecyl-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate ], triethylene glycol-bis-[
- the phosphorus-based antioxidant is 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5, 5] undecane (3,9-Bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane), bis (2 ,6-Dicumylphenyl)pentaerythritol diphosphite (Bis (2,4-dicumylphenyl) pentaerythritol diphosphite), 2,2'-methylenebis (4,6-di-t-butylphenyl) 2-ethylhexyl phosphite ( 2,2'-Methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexyl phosphite), bis(
- the sulfur-based antioxidant is 3,3'-thiobis-1,1'-didodecyl ester (3,3'-thiobis-1,1'-didodecyl ester), dimethyl 3,3'-thiodipropionate ( Dimethyl 3,3'-Thiodipropionate), dioctadecyl 3,3'-thiodipropionate (Dioctadecyl 3,3'-thiodipropionate), 2,2-bis ⁇ [3- (dodecylthio)-1- Oxopropoxy]methyl ⁇ propane-1,3-diyl bis[3-(dodecylthio)propionate](2,2-Bis ⁇ [3-(dodecylthio)-1-oxopropoxy]methyl ⁇ propane- 1,3-diyl bis[3-(dodecylthio)propionate]), or two or more of these.
- the amount of irradiation light of the ultraviolet rays may be in the range of 10 to 1000 mJ/cm 2 .
- a lithium secondary battery of the following embodiments In order to solve the above problems, according to one aspect of the present invention, there is provided a lithium secondary battery of the following embodiments.
- the separator is a separator containing a cross-linked structure for a lithium secondary battery according to any one of the 15th to 19th embodiments.
- the polyolefin porous substrate containing a crosslinked structure includes a region having a different degree of crosslinking even though it includes a crosslinked structure directly connected between polymer chains, and at the same time has a high meltdown temperature and shuts down compared to before crosslinking Changes in temperature can be prevented.
- cross-linked polyolefin porous substrate includes a cross-linked structure directly connected between polymer chains
- the mechanical strength of the polyolefin porous substrate decreases after cross-linking, including regions with different degrees of cross-linking can prevent
- the cross-linked structure-containing separator for lithium secondary batteries including the cross-linked polyolefin porous substrate according to an embodiment of the present invention may have excellent heat resistance and mechanical strength, including the cross-linked polyolefin porous substrate having excellent heat resistance.
- the method for producing a polyolefin porous substrate containing a crosslinked structure uses a second polyolefin composition containing 0.8 parts by weight or more of an antioxidant based on 100 parts by weight of the polyolefin included in the second polyolefin composition, thereby providing a high meltdown temperature. It is possible to prepare a polyolefin porous substrate containing a cross-linked structure, which can maintain the shutdown temperature at the level prior to cross-linking while having
- FIG. 1 is a view schematically showing a polyolefin porous substrate containing a crosslinked structure according to an embodiment of the present invention.
- FIG. 2 is a view schematically showing a polyolefin porous substrate containing a crosslinked structure according to another embodiment of the present invention.
- FIG 3 shows a process in which the first polyolefin composition and the second polyolefin composition are co-extruded in one embodiment of the present invention.
- the cross-linked polyolefin porous substrate according to an embodiment of the present invention is a cross-linked polyolefin porous substrate having a cross-linked structure directly connected between polymer chains, wherein the polyolefin porous substrate extends from one side to the other in a height direction, a first region in contact with the one surface and a second region extending from the outside of the first region in a direction to the other surface, wherein a difference in the degree of crosslinking between the polyolefin included in the first region and the polyolefin included in the second region is 10% It is characterized by more than one.
- the meltdown temperature increases but the shutdown temperature changes compared to before crosslinking there was
- the polyolefin porous substrate having a crosslinked structure according to an embodiment of the present invention may have a high meltdown temperature and a shutdown temperature prior to crosslinking by having regions with different degrees of crosslinking. In addition, it may have excellent mechanical strength.
- FIG. 1 is a view schematically showing a polyolefin porous substrate containing a crosslinked structure according to an embodiment of the present invention.
- the polyolefin porous substrate 1A having a crosslinked structure has a first region 10A in contact with the one surface in a height direction extending from one surface to the other surface.
- the first region 10A has a crosslinked structure in which polymer chains are directly connected. That is, the first region 10A includes a crosslinked polyolefin.
- the 'crosslinked structure in which the polymer chains are directly connected' means that a polymer chain substantially made of polyolefin, more preferably a polymer chain made of only polyolefin, becomes reactive by the addition of a photoinitiator, so that the polymer chains are directly connected to each other. means a cross-linked state. Therefore, a crosslinking reaction that occurs between crosslinking agents by adding an additional crosslinking agent does not correspond to the 'crosslinking structure in which polymer chains are directly connected' as referred to in the present invention.
- crosslinking reaction that occurs between the additional crosslinking agent and the polymer chain does not correspond to the 'crosslinking structure in which the polymer chains are directly connected' referred to in the present invention, even if the polymer chain is substantially made of polyolefin or only polyolefin. does not
- the first region 10A has excellent heat resistance due to the polyolefin chains directly cross-linked with each other.
- the first region 10A has excellent heat resistance to prevent meltdown of the substrate even when the temperature of the polyolefin porous substrate containing the crosslinked structure rises above the melting point of the polyolefin.
- the polyolefin porous substrate 1A having a crosslinked structure has a second region 20A extending from the outside of the first region 10A in the direction to the other surface in the height direction extending from one surface to the other surface. .
- the second region 20A has a crosslinked structure in which polymer chains are directly connected. That is, the second region 20A includes a crosslinked polyolefin.
- the second region 20A has excellent heat resistance due to polyolefin chains directly cross-linked with each other.
- the second region 20A has excellent heat resistance to prevent meltdown of the substrate even when the temperature of the polyolefin porous substrate containing the crosslinked structure rises above the melting point of the polyolefin.
- the crosslinking degree difference between the polyolefin included in the first region 10A and the polyolefin included in the second region 20A is 10% or more.
- the polyolefin porous substrate having a crosslinked structure has a first region 10A and a second region 20A having a crosslinking degree difference of 10% or more, even when the entire polyolefin porous substrate is crosslinked, thereby providing high It can have a meltdown temperature and a shutdown temperature at a level prior to crosslinking. In addition, it may have excellent mechanical strength.
- a region having a greater degree of crosslinking among the first region 10A and the second region 20A has a higher degree of crosslinking, but main chain scission of the polyolefin may occur to maintain the shutdown temperature at a level prior to crosslinking.
- the crosslinked structure-containing polyolefin porous substrate may be contracted by the rapid crosslinking reaction, and excessively excessive main chain scission of the polyolefin may occur, so that the crosslinked structure-containing polyolefin porous substrate mechanically strength may be reduced.
- the polyolefin porous substrate containing the crosslinked structure is contracted or excessively excessive due to a rapid crosslinking reaction. It is possible to prevent deterioration of the mechanical strength of the polyolefin porous substrate containing a crosslinked structure due to main chain scission of the polyolefin. Accordingly, the crosslinked structure-containing polyolefin porous substrate can have appropriate mechanical strength.
- the difference in the degree of crosslinking between the first region 10A and the second region 20A is less than 10%, the difference in the degree of crosslinking between the first region 10A and the second region 20A is not large, so the polyolefin porous substrate containing a crosslinked structure It is difficult to have a shutdown temperature of the level before crosslinking, and it is difficult to secure excellent mechanical strength.
- the crosslinking degree difference between the polyolefin included in the first region 10A and the polyolefin included in the second region 20A is 20% or more, or 22% or more, or 29% or more, or at least 30%, or at least 33%, or at least 40%, or at least 41%. If the difference in the degree of crosslinking between the first region 10A and the second region 20A satisfies the above-mentioned range, it may be easier to have a shutdown temperature at the level before crosslinking, and it will be easier to secure excellent mechanical strength. can
- the first region may be 10% to 80%, alternatively 15% to 70%, or 20% to 60% of the total thickness of the polyolefin porous substrate.
- the ratio of the first region and the second region is sufficiently secured to maintain the shutdown temperature of the polyolefin porous substrate at the level before crosslinking, and it is easier to increase the meltdown temperature can do.
- the degree of crosslinking of the polyolefin included in the first region 10A may be greater than the degree of crosslinking of the polyolefin included in the second region 20A.
- the degree of crosslinking of the polyolefin included in the first region 10A is 20% or more, or 25% or more, or 28% or more, or 30% or more, or 32% or more, or 35% or more, or 39% or more, or 40% or more, or 45% or more, or 48% or more, or 50% or more, or 60% or less, or 50% or less, or 48% or less, or 45% or less, or 40% or less, or 39% or less, or 35% or less, or 32% or less, or 30% or less, or 28% or less, or 25% or less.
- the degree of crosslinking of the polyolefin included in the first region 10A satisfies the above-mentioned range, it may be easier for the polyolefin porous substrate containing the crosslinked structure to have a shutdown temperature of a level before crosslinking.
- the degree of crosslinking of the first region can be calculated by the following formula:
- A is the weight of the first region
- B is immersing the first region in 70 g of trichlorobenzene at 135°C and left at 135°C for 20 hours, then filtering through a 100 mesh wire mesh and removing the insoluble content on the wire mesh The dry mass after collection and vacuum drying is shown.
- the degree of crosslinking can be measured in the same way as described above, but is not limited thereto, and any method for measuring the degree of crosslinking commonly used in the art can be used without limitation.
- the degree of crosslinking of the polyolefin included in the first region 10A is greater than the degree of crosslinking of the polyolefin included in the second region 20A
- the degree of crosslinking of the polyolefin included in the second region 20A is 1% or more, or 2% or more, or 3% or more, or 4% or more, or 5% or more, or 6% or more, or 8% or more, 10% or less, or 8% or less, or 5% or less or 4% or less, or 3% or less, or 2% or less.
- the degree of crosslinking of the second region can be calculated from the following formula:
- A is the weight of the second region
- B is immersed in 70 g of trichlorobenzene at 135°C and left at 135°C for 20 hours, filtered through a 100-mesh wire mesh, and insoluble content on the wire mesh is removed The dry mass after collection and vacuum drying is shown.
- FIG. 2 is a view schematically showing a polyolefin porous substrate containing a crosslinked structure according to another embodiment of the present invention.
- the polyolefin porous substrate 1B having a crosslinked structure may further include a third region 30B extending from the outside of the second region 20B to the other side, and the second region 20B.
- a crosslinking degree difference between the polyolefin included in the polyolefin and the polyolefin included in the third region 30B may be 10% or more.
- the third region 30B has a crosslinked structure in which polymer chains are directly connected. That is, the third region 30B includes cross-linked polyolefin.
- the polyolefin porous substrate containing a crosslinked structure according to an embodiment of the present invention further includes the third region 30B, currying of the separator due to the difference in the degree of crosslinking between the first region 10B and the second region 20B It may be easier to prevent a curling phenomenon from occurring.
- the crosslinking degree difference between the polyolefin included in the third region 30B and the polyolefin included in the second region 20B is 20% or more, or 22% or less, or 29% or more, or at least 30%, or at least 40%, or at least 41%.
- the difference in the degree of crosslinking between the third region 30B and the second region 20B satisfies the above-mentioned range, it may be easier to have a shutdown temperature at the level before crosslinking, and it will be easier to secure excellent mechanical strength.
- the second region 20B may be 10% to 60%, or 15% to 50%, or 15% to 45% of the total thickness of the polyolefin porous substrate.
- the ratio occupied by the first region, the second region, and the third region is sufficiently secured to maintain the shutdown temperature of the polyolefin porous substrate at the level before crosslinking, and the meltdown temperature It may be easier to raise the
- the degree of crosslinking of the polyolefin included in the third region 30B may be greater than the degree of crosslinking of the polyolefin included in the second region 20B.
- the degree of crosslinking of the polyolefin included in the third region 30B is 20% or more, or 25% or more, or 28% or more, or 30% or more, or 32% or more, or 35% or more, or 39% or more, or 40% or more, or 45% or more, or 48% or more, or 50% or more, or 60% or less, or 50% or less, or 48% or less, or 45% or less, or 40% or less, or 39% or less, or 35% or less, or 32% or less, or 30% or less, or 28% or less, or 25% or less.
- the degree of crosslinking of the polyolefin included in the third region 10B satisfies the aforementioned range, it may be easier for the polyolefin porous substrate containing the crosslinked structure to have a shutdown temperature at a level before crosslinking.
- the degree of crosslinking of the third region can be calculated by the following formula:
- A is the weight of the third region
- B is the third region is immersed in 70 g of trichlorobenzene at 135°C, left at 135°C for 20 hours, filtered through a 100 mesh wire mesh, and the insoluble content on the wire mesh is removed The dry mass after collection and vacuum drying is shown.
- the degree of crosslinking can be measured in the same way as described above, but is not limited thereto, and any method for measuring the degree of crosslinking commonly used in the art can be used without limitation.
- the third region 30B may have the same physical properties as the first region 10B.
- the crosslinked structure-containing polyolefin porous substrate may be a porous film.
- the polyolefin is polyethylene; polypropylene; polybutylene; polypentene; polyhexene; polyoctene; copolymers of two or more of ethylene, propylene, butene, pentene, 4-methylpentene, hexene, and octene; Or it may include two or more of these.
- Non-limiting examples of the polyethylene include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), and the like.
- LDPE low density polyethylene
- LLDPE linear low density polyethylene
- HDPE high density polyethylene
- the polyethylene is high-density polyethylene having a high crystallinity and a high melting point of the resin, it may have a desired level of heat resistance and a modulus may be easily increased.
- the polyolefin may have a weight average molecular weight of 200,000 to 1,500,000, or 220,000 to 1,000,000, or 250,000 to 800,000, or 250,000 to 600,000.
- a weight average molecular weight within the above range, uniformity and film forming processability of the polyolefin porous substrate may be secured, and strength and heat resistance may be excellent.
- the weight average molecular weight may be measured by gel permeation chromatography (GPC, PL GPC220, Agilent Technologies) under the following conditions.
- the number of double bonds present in the olefin polymer chain as measured by H-NMR is 0.01 to 0.6, or 0.02 to 0.5 per 1000 carbon atoms.
- H-NMR H-NMR
- the crosslinked structure-containing porous olefin polymer support has the above-described number of double bonds, it may be easy to prevent a problem of deterioration of battery performance at high temperatures and/or high voltages.
- the double bond structure present in the polyolefin chain may be present at the end of the polyolefin chain, or may exist inside the polyolefin chain, that is, throughout the polyolefin chain except for the end.
- the number of double bond structures present in the polyolefin chain except for the terminal may affect the crosslinking of the polyolefin chain.
- the number of double bonds present in the olefin polymer chain excluding the terminal of the crosslinked structure-containing porous olefin polymer support may be 0.005 to 0.59 per 1000 carbon atoms.
- the "double bond present in the polyolefin chain except for the end” refers to a double bond present throughout the polyolefin chain except at the end of the polyolefin chain.
- the term “terminal” refers to a position of a carbon atom connected to both ends of the polyolefin chain.
- the thickness of the crosslinked structure-containing porous olefin polymer support may be 3 ⁇ m to 16 ⁇ m, or 5 ⁇ m to 12 ⁇ m.
- the thickness of the crosslinked structure-containing porous olefin polymer support is within the above-described range, it is possible to prevent a problem that the separator may be easily damaged during battery use, and it may be easy to secure energy density.
- the separator containing a cross-linked structure for a lithium secondary battery may be made of a cross-linked structure-containing olefin polymer porous support having a cross-linked structure in which polymer chains are directly connected.
- the separator containing a cross-linked structure for a lithium secondary battery is positioned on at least one surface of the cross-linked structure-containing polyolefin porous substrate, and may further include an inorganic hybrid pore layer including an inorganic filler and a binder polymer.
- the inorganic hybrid pore layer may be formed on one or both surfaces of the crosslinked structure-containing olefin polymer porous support.
- the inorganic hybrid pore layer includes an inorganic filler and a binder polymer that attaches them to each other (that is, the binder polymer connects and fixes between the inorganic fillers) so that the inorganic fillers can maintain a state in which they are bound to each other, and by the binder polymer It is possible to maintain a state in which the inorganic filler and the polyolefin porous substrate are bound.
- the inorganic hybrid pore layer can improve the safety of the separator by preventing the polyolefin porous substrate from exhibiting extreme heat shrinkage behavior at high temperatures by the inorganic filler. For example, the thermal contraction rate of the separator in the machine direction and the transverse direction measured after standing at 120 ° C. for 30 minutes is 20% or less, or 2% to 15%, or 2% to 10%, respectively can be
- the inorganic filler is not particularly limited as long as it is electrochemically stable. That is, the inorganic particles are not particularly limited as long as oxidation and/or reduction reactions do not occur in the operating voltage range of the applied electrochemical device (eg, 0-5V based on Li/Li + ).
- the ionic conductivity of the electrolyte may be improved by contributing to an increase in the degree of dissociation of an electrolyte salt, such as a lithium salt, in a liquid electrolyte.
- the inorganic filler may include a high dielectric constant inorganic filler having a dielectric constant of 5 or more, or 10 or more.
- inorganic fillers having a dielectric constant of 5 or more include BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT, 0 ⁇ x ⁇ 1) , 0 ⁇ y ⁇ 1), Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), hafnia (HfO 2 ), SrTiO 3 , SnO 2 , CeO 2 , MgO, Mg( OH) 2 , NiO, CaO, ZnO, ZrO 2 , SiO 2 , Y 2 O 3 , Al 2 O 3 , AlOOH, Al(OH) 3 , SiC, TiO 2 , or mixture
- an inorganic filler having lithium ion transport ability that is, an inorganic filler containing elemental lithium but not storing lithium and having a function of moving lithium ions may be used.
- Non-limiting examples of inorganic fillers having lithium ion transport ability include lithium phosphate (Li 3 PO 4 ), lithium titanium phosphate (Li x Ti y (PO 4 ) 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 3), Lithium aluminum titanium phosphate (Li x Al y Ti z (PO 4 ) 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 3), 14Li 2 O-9Al 2 O 3 -38TiO 2 -39P 2 (LiAlTiP) x O y series glass such as O 5 (0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 13), lithium lanthanum titanate (Li x La y TiO 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 3) , Li 3.25 Ge 0.25 P 0.75 S 4 , etc.
- Li 3 PO 4 lithium titanium phosphate
- lithium germanium thiophosphate Li x Ge y P z S w , 0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1, 0 ⁇ w ⁇ 5
- lithium nitride such as Li 3 N (Li x N y , 0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 2), Li 3 PO 4 -Li 2 S-SiS 2 etc.
- SiS 2 series glass Li x Si P 2 S 5 series glass (Li x P y S z , 0 ⁇ x ⁇ 3), such as y S z , 0 ⁇ x ⁇ 3, 0 ⁇ y ⁇ 2, 0 ⁇ z ⁇ 4), LiILi 2 SP 2 S 5 , etc. , 0 ⁇ y ⁇ 3, 0 ⁇ z ⁇ 7) or two or more of these.
- the size of the inorganic filler is not limited, but in order to form a coating layer having a uniform thickness and an appropriate porosity, the average particle diameter of the inorganic filler is 0.001 to 10 ⁇ m, or 0.01 to 10 ⁇ m, or 0.05 to 5 ⁇ m, or 0.1 to 2 ⁇ m.
- the size of the inorganic filler satisfies this range, it may be easy to form an inorganic hybrid pore layer having a uniform thickness and appropriate porosity, and the inorganic filler may have good dispersibility and provide a desired energy density. have.
- the average particle diameter of the inorganic filler means a D 50 particle diameter
- “D 50 particle diameter” means a particle diameter at 50% of the cumulative distribution of the number of particles according to the particle diameter.
- the particle size may be measured using a laser diffraction method. Specifically, after dispersing the powder to be measured in a dispersion medium, it is introduced into a commercially available laser diffraction particle size measuring device (eg Microtrac S3500) to measure the diffraction pattern difference according to the particle size when the particles pass through the laser beam to measure the particle size distribution to calculate The D50 particle diameter can be measured by calculating the particle diameter at the point used as 50% of the particle number cumulative distribution according to the particle diameter in a measuring apparatus.
- a laser diffraction particle size measuring device eg Microtrac S3500
- the binder polymer may have a glass transition temperature (Tg) of -200 to 200°C. When the glass transition temperature of the binder polymer satisfies the aforementioned range, mechanical properties such as flexibility and elasticity of the finally formed inorganic hybrid pore layer may be improved.
- the binder polymer may have an ion conductive ability. When the binder polymer has ion-conducting ability, the performance of the battery may be further improved.
- the binder polymer is polyvinylidene fluoride, poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), poly (vinylidene fluoride-tetrafluoroethylene) (poly(vinylidene fluoride-co-tetrafluoroethylene)), poly(vinylidene fluoride-trichloroethylene) (poly(vinylidene fluoride-co-trichloroethylene)), acrylic copolymer, Styrene-butadiene copolymer, poly(acrylic acid), poly(methylmethacrylate), poly(butylacrylate), poly(acrylonitrile) ) (poly(acrylonitrile)), poly(vinylpyrrolidone) (poly(vinylpyrrolidone)), poly(vinylalcohol) (poly(vinylalco
- the acrylic copolymer is ethyl acrylate-acrylic acid-N,N-dimethylacrylamide copolymer, ethyl acrylate-acrylic acid-2-(dimethylamino)ethyl acrylate copolymer, ethyl acrylate-acrylic acid-N,N-di ethylacrylamide copolymer, ethyl acrylate-acrylic acid-2-(diethylamino)ethyl acrylate copolymer, or two or more thereof.
- the weight ratio of the inorganic filler and the binder polymer is determined in consideration of the thickness, pore size and porosity of the finally prepared inorganic hybrid pore layer, but 50:50 to 99.9:0.1, or 60:40 to 99.5:0.5.
- the weight ratio of the inorganic filler to the binder polymer is within the above range, it may be easy to secure the pore size and porosity of the inorganic hybrid pore layer by sufficiently securing an empty space formed between the inorganic fillers. In addition, it may be easy to secure the adhesive force between the inorganic fillers.
- the inorganic hybrid pore layer is filled with the inorganic fillers and bound to each other by the binder polymer in a state in which they are in contact with each other, whereby interstitial volumes are formed between the inorganic fillers. formed, and the interstitial volume between the inorganic fillers becomes an empty space and may have a structure in which pores are formed.
- the inorganic hybrid pore layer includes a plurality of nodes including the inorganic filler and a binder polymer covering at least a portion of the surface of the inorganic filler; and a yarn in the binder polymer of the node It includes one or more filaments formed in a (thread) shape, wherein the filaments have a node connecting portion extending from the node to connect other nodes, wherein the node connecting portion includes a plurality of filaments derived from the binder polymer It may have a structure in which the filaments cross each other to form a three-dimensional network structure.
- the average pore size of the inorganic hybrid pore layer may be in the range of 0.001 to 10 ⁇ m or 0.001 to 1 ⁇ m.
- the average pore size of the inorganic hybrid pore layer may be measured according to a capillary flow porometry method.
- the capillary flow pore diameter measurement method is a method in which the diameter of the smallest pore in the thickness direction is measured. Therefore, in order to measure the average pore size of only the inorganic hybrid pore layer by the capillary flow pore diameter measurement method, the inorganic hybrid pore layer is separated from the olefin polymer porous support containing a crosslinked structure to support the separated inorganic hybrid pore layer. It should be measured in a state wrapped with a non-woven fabric, and in this case, the pore size of the non-woven fabric should be much larger than the pore size of the inorganic hybrid pore layer.
- the porosity of the inorganic hybrid pore layer may be in the range of 5 to 95%, or in the range of 10 to 95%, or in the range of 20 to 90%, or in the range of 30 to 80%.
- the porosity corresponds to a value obtained by subtracting a volume converted to the weight and density of each component of the porous coating layer from the calculated thickness, width, and length of the porous coating layer.
- the porosity of the inorganic hybrid pore layer is a scanning electron microscope (SEM) image, a mercury porosimeter, or a porosimetry analyzer (Bell Japan Inc, Belsorp-II mini) using nitrogen gas adsorption distribution It can be measured by the BET 6-point method by law.
- the thickness of the inorganic hybrid porous layer may be 1.5 ⁇ m to 5.0 ⁇ m on one side of the crosslinked structure-containing olefin polymer porous support.
- the thickness of the inorganic hybrid pore layer satisfies the above-mentioned range, it may be easy to increase the cell strength of the battery while having excellent adhesion to the electrode.
- a separator containing a cross-linked structure for a lithium secondary battery includes: the cross-linked structure-containing porous olefin polymer support; an inorganic hybrid pore layer positioned on at least one surface of the crosslinked structure-containing olefin polymer porous support and comprising an inorganic filler and a first binder polymer; and a porous adhesive layer positioned on the inorganic hybrid pore layer and including a second binder polymer.
- the inorganic hybrid pore layer may be formed on one or both surfaces of the crosslinked structure-containing olefin polymer porous support.
- the inorganic hybrid pore layer includes a first binder polymer that attaches the inorganic filler and the inorganic filler to each other (that is, the first binder polymer connects and fixes the inorganic fillers) so that they can maintain a state in which they are bound to each other, The state in which the inorganic filler and the crosslinked structure-containing porous olefin polymer support are bound by the first binder polymer may be maintained.
- the inorganic hybrid pore layer can improve the safety of the separation membrane by preventing the porous olefin polymer support having a cross-linked structure from exhibiting extreme heat shrinkage behavior at high temperatures by an inorganic filler.
- the thermal contraction rate of the separator in the machine direction and the transverse direction measured after leaving at 150° C. for 30 minutes is 20% or less, or 2% to 15%, or 2% to 10%, respectively can be
- the inorganic hybrid pore layer is bound to each other by the first binder polymer in a state in which the inorganic fillers are filled and in contact with each other, thereby interstitial volumes between the inorganic fillers. ) is formed, and the interstitial volume between the inorganic fillers becomes an empty space to form pores.
- the porous adhesive layer includes a second binder polymer so that the separator having the inorganic hybrid pore layer can secure adhesion to the electrode.
- the porous adhesive layer has pores, it is possible to prevent an increase in the resistance of the separator.
- the second binder polymer may not penetrate into the surface and/or inside of the porous olefin polymer support having a crosslinked structure in the porous adhesive layer, thereby minimizing the increase in resistance of the separator.
- the porous adhesive layer may have a pattern including one or more adhesive parts including the second binder polymer and one or more uncoated parts in which the adhesive part is not formed.
- the pattern may be dot-shaped, stripe-shaped, oblique, wavy, triangular, square, or semi-circular.
- the thickness of the porous adhesive layer may be 0.5 ⁇ m to 1.5 ⁇ m, or 0.6 ⁇ m to 1.2 ⁇ m, or 0.6 ⁇ m to 1.0 ⁇ m.
- the thickness of the porous adhesive layer is within the above-mentioned range, the adhesion to the electrode is excellent, and as a result, the cell strength of the battery may be increased.
- it may be advantageous in terms of cycle characteristics and resistance characteristics of the battery.
- the first binder polymer may be a binder polymer having excellent heat resistance.
- the heat resistance properties of the inorganic hybrid pore layer may be further improved.
- the thermal contraction rate of the separator in the machine direction and the transverse direction measured after leaving at 150 ° C. for 30 minutes is 20% or less, or 2% to 15%, or 2% to 10%, respectively, or from 2% to 5%, alternatively from 0% to 5%, alternatively from 0% to 2%.
- the first binder polymer may include an acrylic polymer, polyacrylic acid, styrene butadiene rubber, polyvinyl alcohol, or two or more of these.
- the acrylic polymer may include an acrylic homopolymer obtained by polymerizing only an acrylic monomer, or may include a copolymer of an acrylic monomer and another monomer.
- the acrylic polymer is a copolymer of ethylhexyl acrylate and methyl methacrylate, poly(methylmethacrylate), and polyethylhexyl acrylate (poly(ethylexyl acrylate). ), poly(butylacrylate), polyacrylonitrile (poly(acrylonitrile)), a copolymer of butyl acrylate and methyl methacrylate, or two or more of these.
- the weight ratio of the inorganic filler to the first binder polymer may be 95:5 to 99.9:0.1, or 96:4 to 99.5:0.5, or 97:3 to 99:1.
- the content of the inorganic filler distributed per unit area of the separator is large, so that the thermal stability of the separator at high temperature can be improved.
- the thermal contraction rate of the separator in the machine direction and the transverse direction measured after leaving at 150 ° C. for 30 minutes is 20% or less, or 2% to 15%, or 2% to 10%, respectively, or from 2% to 5%, alternatively from 0% to 5%, alternatively from 0% to 2%.
- the second binder polymer may be a binder polymer commonly used to form an adhesive layer.
- the second binder polymer may have a glass transition temperature (Tg) of -200 to 200°C. When the glass transition temperature of the second binder polymer satisfies the aforementioned range, mechanical properties such as flexibility and elasticity of the finally formed adhesive layer may be improved.
- the second binder polymer may have an ion conductive ability. When a binder polymer having ion-conducting ability is used as the second binder polymer, the performance of the battery can be further improved.
- the second binder polymer is polyvinylidene fluoride (poly(vinylidene fluoride)), poly(vinylidene fluoride-hexafluoropropylene) (poly(vinylidene fluoride-co-hexafluoropropylene)) , poly(vinylidene fluoride-co-trichloroethylene)), poly(vinylidene fluoride-tetrafluoroethylene) (poly(vinylidene fluoride-co-tetrafluoroethylene)), poly( vinylidene fluoride-trifluoroethylene (poly(vinylidene fluoride-co-trifluoroethylene)), polymethylmethacrylate, polyethylhexyl acrylate, polybutylacrylate, poly Acrylonitrile, polyvinylpyrrolidone, polyvinylacetate, copolymer of ethylhexyl acrylate and
- the separator having a cross-linked structure for a lithium secondary battery includes a cross-linked structure-containing olefin polymer porous support having a cross-linked structure directly connected between polymer chains, and thus may have excellent high-temperature stability.
- the melt-down temperature of the separator containing the cross-linked structure for a lithium secondary battery may be increased compared to the melt-down temperature of the separator for a lithium secondary battery prior to conventional cross-linking.
- the melt down temperature of the separator is 160 °C or higher, or 170 °C or higher, or 180 °C or higher, or 190 °C or higher, or 197 °C or higher, or 198 °C or higher, or 200 °C or higher, or 230 °C or higher.
- the term "separator for lithium secondary batteries before cross-linking” refers to a separator made of a non-cross-linked, non-cross-linked olefin polymer porous support; Or a separation membrane comprising a non-crosslinked porous olefin polymer support without a crosslinked structure, and an inorganic hybrid pore layer positioned on at least one surface of the porous olefinic polymer support not containing a crosslinked structure and containing an inorganic filler and a binder polymer; Or a non-crosslinked porous olefin polymer support without a crosslinked structure, an inorganic hybrid pore layer positioned on at least one surface of the porous olefin polymer support not containing a crosslinked structure and comprising an inorganic filler and a first binder polymer, and the inorganic hybrid pore layer It is located on the upper surface, and refers to a separator including a porous adhesive layer containing a second binder poly
- the melt-down temperature may be measured by thermomechanical analysis (TMA). For example, after taking samples in the machine direction and the transverse direction, respectively, a sample having a width of 4.8 mm x a length of 8 mm was put in a TMA equipment (TA Instrument, Q400) and a tension of 0.01 N was applied. While changing the temperature from 30 °C to 220 °C at a temperature increase rate of 5 °C/min in the state, the temperature at which the length is rapidly increased and the sample breaks can be measured as the meltdown temperature.
- TMA thermomechanical analysis
- the shutdown temperature may not increase significantly, and the rate of change may also be small.
- the melt-down temperature of the separator increases compared to before cross-linking, but the shutdown temperature does not increase significantly, so overcharge safety due to the shutdown temperature can be secured while the separator can greatly increase the high temperature stability of
- the separator containing a cross-linked structure for a lithium secondary battery may have a shutdown temperature of 146°C or less, or 145°C or less, or 140°C or less, or 133°C to 140°C.
- a shutdown temperature 146°C or less, or 145°C or less, or 140°C or less, or 133°C to 140°C.
- the shutdown temperature is measured by measuring the time (sec) it takes for 100 ml of air to pass through the separator at a constant pressure of 0.05 Mpa when the temperature is raised by 5° C. per minute using reciprocating air permeability equipment. It can be measured by measuring the temperature.
- the separator containing a cross-linked structure for a lithium secondary battery includes a porous olefin polymer support containing a cross-linked structure having a cross-linked structure in which polymer chains in the porous olefin polymer support are directly connected, so that even after cross-linking, the porous olefin polymer support
- the pore structure of can be substantially maintained as it is before crosslinking.
- a separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has air permeability, basis weight, tensile strength, tensile elongation, puncture strength, electrical resistance, etc. prior to cross-linking lithium secondary Compared to the air permeability, basis weight, tensile strength, tensile elongation, puncture strength, electrical resistance, etc. of the separator for batteries, it may not deteriorate significantly, and the rate of change may also be small.
- the separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has a change in air permeability of 10% or less, 0% to 10%, 0% to 5%, or 0%, compared to the separator for lithium secondary battery before crosslinking to 3%.
- the rate of change of air permeability can be calculated by the following formula.
- the "separator containing cross-linked structure for lithium secondary batteries after cross-linking" refers to a separator made of a porous olefin polymer support containing cross-linked structure; Or a separation membrane comprising a cross-linked structure-containing porous olefin polymer support, and an inorganic hybrid pore layer including an inorganic filler and a binder polymer, located on at least one surface of the cross-linked structure-containing porous olefin polymer support; Or a crosslinked structure-containing olefin polymer porous support, an inorganic material hybrid pore layer comprising an inorganic filler and a first binder polymer located on at least one surface of the crosslinked structure-containing olefin polymer porous support body, and located on the upper surface of the inorganic material hybrid pore layer It refers to a separator including a porous adhesive layer including a second binder polymer.
- Gurley The air permeability (Gurley) may be measured by the ASTM D726-94 method. Gurley, as used herein, is the resistance to the flow of air, measured by a Gurley densometer. The air permeability values described herein are expressed as the time (in seconds) it takes for 100 cc of air to pass through the cross section of 1 in 2 of the sample porous support under a pressure of 12.2 inH 2 O, that is, the aeration time.
- the separator having a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention may have a change in basis weight of 5% or less or 0% to 5%.
- the change rate of the basis weight can be calculated by the following formula.
- the basis weight (g/m 2 ) is indicated by preparing a sample having a width and length of 1 m, respectively, and measuring the weight thereof.
- the separator for lithium secondary battery according to an embodiment of the present invention has a change in tensile strength in the machine direction and perpendicular direction of 20% or less, or 0% to 20%, compared to the separator for lithium secondary battery before crosslinking, or from 0% to 10%, alternatively from 0% to 9%, alternatively from 0% to 8%, alternatively from 0% to 7.53%.
- the rate of change of tensile strength can be calculated by the following formula.
- the tensile strength is measured in accordance with ASTM D882 when the specimen is pulled in the machine direction and transverse direction at a speed of 50 mm/min using Universal Testing Systems (Instron® 3345), respectively. This may mean the strength at the time of breaking.
- the separator for lithium secondary battery according to an embodiment of the present invention has a change in tensile elongation in the machine direction and perpendicular direction of 20% or less, or 0% to 20%, compared to the separator for lithium secondary battery before crosslinking can
- the rate of change of tensile elongation can be calculated by the following formula.
- the tensile elongation was obtained by pulling the specimen in the machine direction and transverse direction at a speed of 50 mm/min using Universal Testing Systems (Instron® 3345) in accordance with ASTM D882, respectively. It can be calculated using the following formula by measuring the maximum length stretched until it breaks.
- the separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has a rate of change of puncture strength of 10% or less, or 0.5% to 10%, or 1% to 9%, or 1.18% to 8.71%.
- the rate of change of the puncture strength can be calculated by the following formula.
- the puncture strength can be measured according to ASTM D2582. Specifically, after a round tip of 1 mm is set to operate at a speed of 120 mm/min, the puncture strength can be measured according to ASTM D2582.
- the separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention may have a change in electrical resistance of 15% or less, or 2% to 10%, or 2% to 5%, compared to the separator for lithium secondary battery before crosslinking have.
- the rate of change of electrical resistance can be calculated by the following formula.
- the electrical resistance can be obtained by measuring the separator resistance by an impedance measurement method after leaving the coin cell prepared including the separator sample at room temperature for 1 day.
- the crosslinked structure-containing polyolefin porous substrate according to an embodiment of the present invention may be manufactured by the method for preparing a crosslinked structure-containing polyolefin porous substrate described later, but is not limited thereto.
- the polyolefin porous substrate having a crosslinked structure according to an embodiment of the present invention may be prepared by irradiating only one surface of the polyolefin porous substrate with ultraviolet rays and not irradiating the other surface with ultraviolet rays.
- step (S3) manufacturing a polyolefin porous substrate by molding and stretching the resultant product of step (S2) in a sheet form;
- step (S6) applying a photoinitiator composition comprising a photoinitiator to the resultant of step (S5);
- the antioxidant is contained in an amount of 0.8 parts by weight or more based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- a photoinitiator may be introduced into the surface of the polyolefin porous substrate to crosslink the polyolefin porous substrate upon UV irradiation.
- the "surface of the polyolefin porous substrate” may include not only the surface of the outermost layer of the polyolefin porous substrate, but also the surface of pores existing inside the polyolefin porous substrate.
- the photoinitiator directly photocrosslinks the polymer chains in the polyolefin porous substrate.
- the photoinitiator can crosslink the polyolefin porous substrate by itself without a crosslinking agent or other components such as a coinitiator or a synergist.
- a crosslinking agent such as a coinitiator or a synergist.
- the photoinitiator becomes a reactive compound, and this photoinitiator forms a radical in the polymer chain in the polyolefin porous substrate to make the polymer chain reactive. They are directly linked to allow photocrosslinking.
- radicals can be generated in the polymer chains in the polyolefin porous substrate by using the photoinitiator, so that a crosslinked structure in which the polymer chains are directly connected can be formed.
- a first polyolefin composition including a polyolefin and a diluent and a second polyolefin composition including a polyolefin, a diluent, and an antioxidant are prepared (S1).
- the first polyolefin composition is prepared as a region having a greater degree of crosslinking among the first and second regions, after undergoing steps such as co-extrusion and stretching, which will be described later.
- steps such as co-extrusion and stretching, which will be described later.
- the diluent is paraffin; wax; soybean oil; phthalic acid esters such as dibutyl phthalate, dihexyl phthalate, and dioctyl phthalate; aromatic ethers such as diphenyl ether and benzyl ether; fatty acids having 10 to 20 carbon atoms, such as palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid; C10-20 fatty acid alcohols, such as palmitic acid alcohol, stearic acid alcohol, and oleic acid alcohol; Palmitic acid mono-, di-, or triesters, stearic acid mono-, di-, or triesters.
- Saturated or unsaturated fatty acid having 4 to 26 carbon atoms in the fatty acid group such as oleic acid mono-, di-, or triester, linoleic acid mono-, di-, or triester, or one in which the double bond of the unsaturated fatty acid is substituted with an epoxy or 2 or more fatty acids, 1 to 8 hydroxyl groups, and ester-bonded fatty acid esters with alcohols having 1 to 10 carbon atoms; Or it may include two or more of these.
- the weight ratio of the polyolefin and the diluent may be 20:80 to 50:50, or 40:60 to 30:70.
- an appropriate level of porosity and average pore size of the finally prepared polyolefin porous substrate can be secured, the pores can be interconnected with each other, so that the permeability can be improved, and extrusion
- the second polyolefin composition is prepared as a region having a low degree of crosslinking among the first region and the second region after going through steps such as co-extrusion and stretching, which will be described later.
- steps such as co-extrusion and stretching, which will be described later.
- the antioxidant neutralizes free radicals formed on the polyolefin chain, thereby minimizing crosslinking reaction caused by ultraviolet rays on the surface of the separator.
- These antioxidants are largely classified into radical scavengers that react with radicals generated in polyolefins to stabilize polyolefins, and peroxide decomposers that decompose peroxides generated by radicals into stable molecules.
- the radical scavenger releases hydrogen to stabilize the radical and itself becomes a radical, but may remain in a stable form through a resonance effect or rearrangement of electrons.
- the peroxide decomposing agent may exhibit a more excellent effect when used in combination with a radical scavenger.
- the second polyolefin composition includes an antioxidant, and even if the photoinitiator composition described later is applied to the entire separator containing a crosslinked structure for a lithium secondary battery, the method for manufacturing a separator containing a crosslinked structure for a lithium secondary battery according to an embodiment of the present invention
- the prepared separator was able to maintain the level of shutdown temperature and mechanical strength before cross-linking.
- the antioxidant included in the second polyolefin composition is included in an amount of 0.8 parts by weight or more based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- a difference in the degree of crosslinking between the first region and the second region may be 10% or more.
- the antioxidant included in the second polyolefin composition may include a first antioxidant that is a radical scavenger and a second antioxidant that is a peroxide decomposer.
- a first antioxidant and a second antioxidant it may be easier to prevent a crosslinking reaction of the second polyolefin composition due to the synergistic effect of the antioxidants.
- the first antioxidant may be a phenolic antioxidant, an amine antioxidant, or a mixture thereof.
- the phenolic antioxidant is 2,6-di-t-butyl-4-methylphenol, 4,4'-thiobis(2-t-butyl-5-methylphenol), 2,2'-thiodiethyl Bis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], pentaerythritol tetrakis-[3-(3,5-di-t-butyl-4- Hydroxyphenyl) -propionate] (Pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate]), 4,4'-thiobis (2-methyl-6-t- Butylphenol), 2,2'-thiobis(6-t-butyl-4-methylphenol), octadecyl-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propio nate], triethylene glycol-bis
- the second antioxidant may be a phosphorus-based antioxidant, a sulfur-based antioxidant, or a mixture thereof.
- the phosphorus-based antioxidant decomposes peroxide to form alcohol, which is converted into phosphate.
- the phosphorus-based antioxidant is 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5] ,5]undecane (3,9-Bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane), bis( 2,6-dicumylphenyl)pentaerythritol diphosphite (Bis(2,4-dicumylphenyl) pentaerythritol diphosphite), 2,2'-methylenebis(4,6-di-t-butylphenyl) 2-ethylhexyl phosphite (2,2'-Methylenebis(4,6-
- the sulfur-based antioxidant is 3,3'-thiobis-1,1'-didodecyl ester (3,3'-thiobis-1,1'-didodecyl ester), dimethyl 3,3'-thiodipropionate ( Dimethyl 3,3'-Thiodipropionate), dioctadecyl 3,3'-thiodipropionate (Dioctadecyl 3,3'-thiodipropionate), 2,2-bis ⁇ [3- (dodecylthio)-1- Oxopropoxy]methyl ⁇ propane-1,3-diyl bis[3-(dodecylthio)propionate](2,2-Bis ⁇ [3-(dodecylthio)-1-oxopropoxy]methyl ⁇ propane- 1,3-diyl bis[3-(dodecylthio)propionate]), or two or more of these.
- the first antioxidant may be included in 0.5 parts by weight or more, or 1.5 parts by weight or less, based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- the second antioxidant may be included in an amount of 0.3 parts by weight or more, or 0.5 parts by weight or more, or 0.7 parts by weight or less, based on 100 parts by weight of the polyolefin included in the second polyolefin composition.
- first and/or second antioxidants are included in the second polyolefin composition in the above-described range, it may be easier for the difference in the degree of crosslinking between the above-described first region and the second region to be 10% or more.
- alkyl radicals may be generated by heat or mechanical shear stress during processing steps such as extrusion and stretching.
- the generated radicals are rapidly oxidized by oxygen and residual metal components, and may cause changes in the appearance and shape of polyolefin as well as changes in chemical structure and physical properties.
- the antioxidant can prevent the deterioration of the polyolefin.
- an antioxidant may be further added to the first polyolefin composition to prevent deterioration (decomposition, discoloration) of the polyolefin.
- the content of the antioxidant included in the first polyolefin composition may be 0.2 parts by weight or less, or 0.07 parts by weight to 0.2 parts by weight.
- the content of the antioxidant satisfies the above-mentioned range, it may be easy to prevent deterioration of the first polyolefin composition without preventing the polyolefin from being crosslinked.
- the antioxidant included in the first polyolefin composition may further include a third antioxidant that is a radical scavenger and a fourth antioxidant that is a peroxide decomposer.
- a third antioxidant that is a radical scavenger
- a fourth antioxidant that is a peroxide decomposer.
- the third antioxidant may be a phenolic antioxidant, an amine antioxidant, or a mixture thereof.
- phenolic antioxidant refer to the above description.
- the fourth antioxidant may be a phosphorus-based antioxidant, a sulfur-based antioxidant, or a mixture thereof.
- phosphorus-based antioxidant and the sulfur-based antioxidant refer to the foregoing.
- the third antioxidant may be of the same type as the first antioxidant.
- the fourth antioxidant may be of the same type as the second antioxidant.
- the third antioxidant may be included in an amount of 0.05 to 0.1 parts by weight based on 100 parts by weight of the polyolefin included in the first polyolefin composition.
- the fourth antioxidant may be included in an amount of 0.02 to 0.1 parts by weight based on 100 parts by weight of the polyolefin included in the first polyolefin composition.
- the polyolefin does not prevent crosslinking, so that the difference in the degree of crosslinking between the first region and the second region is 10% or more It may be easier to do this, and it may be easier to prevent deterioration of the first polyolefin composition.
- first polyolefin composition and the second polyolefin composition are co-extruded so that the extrusion product of the second polyolefin composition is laminated on the upper surface of the extrusion product of the first polyolefin composition (S2).
- the first polyolefin composition and the second polyolefin composition are co-extruded under controlled flow in the form of a first polyolefin composition/second polyolefin composition.
- the step (S2) includes the step of co-extruding so that the extrusion result of the first polyolefin composition, the extrusion result of the second polyolefin composition, and the extrusion result of the first polyolefin composition are laminated can do.
- the extrusion result of the second polyolefin composition is laminated on the upper surface of the extrusion result of the first polyolefin composition
- the extrusion result of the first polyolefin composition is laminated on the upper surface of the extrusion result of the second polyolefin composition.
- the first polyolefin composition and the second polyolefin composition may be co-extruded by controlling the flow of the first polyolefin composition/second polyolefin composition/first polyolefin composition.
- the step (S2) includes the step of co-extruding so that the extrusion result of the second polyolefin composition, the extrusion result of the first polyolefin composition, and the extrusion result of the second polyolefin composition are laminated can do.
- the extrusion result of the second polyolefin composition is laminated on one surface of the extrusion result of the first polyolefin composition, and the extrusion result of the second polyolefin composition is laminated on the other surface of the extrusion result of the first polyolefin composition.
- the first polyolefin composition and the second polyolefin composition may be co-extruded under controlled flow in the form of a second polyolefin composition/second polyolefin composition/second polyolefin composition.
- FIG 3 shows a process in which the first polyolefin composition and the second polyolefin composition are co-extruded in one embodiment of the present invention.
- the first polyolefin composition 100 and the second polyolefin composition 200 are co-extruded. Accordingly, both sides of the second polyolefin composition 200 may be coated with the first polyolefin composition 100 .
- the co-extrusion method is not particularly limited as long as it is a method available in the art.
- step (S2) is molded and stretched in a sheet form to prepare a polyolefin porous substrate (S3).
- the co-extrusion product of the above-described first polyolefin composition and the second polyolefin composition may be prepared, and then a cooled extrudate may be formed using a general casting method using water cooling or air cooling, or a calendering method. Thereafter, the sheet is formed by stretching using the cooled extrudate, so that the strength required as a separator for a lithium secondary battery can be imparted.
- the stretching may be performed by a roll method or a tenter method sequentially or simultaneously stretching.
- the draw ratio may be 3 times or more, preferably 5 to 10 times, respectively, in the longitudinal direction and the transverse direction, and the total draw ratio may be 20 to 80 times.
- the draw ratio is in the above-mentioned range, the orientation in both directions is sufficient, and the balance of physical properties between the longitudinal and transverse directions can be maintained at the same time, and pores can be sufficiently formed.
- the stretching temperature may vary depending on the melting point of the polyolefin used and the concentration and type of the photoinitiator to be described later.
- the stretching temperature may be selected in a temperature range at which 30 to 80% by weight of the crystalline portion of the polyolefin in the sheet is melted.
- the melting degree of the crystal part of the polyolefin according to the temperature can be obtained from a differential scanning calorimeter (DSC) analysis.
- DSC differential scanning calorimeter
- the diluent is extracted from the result of the step (S3) (S4).
- the diluent may be extracted using an organic solvent.
- the usable organic solvent any one capable of extracting the diluent used for polyolefin extrusion can be used, and is not particularly limited.
- the organic solvent methyl ethyl ketone, methylene chloride, hexane, etc. may be used with high extraction efficiency and fast drying.
- an immersion method As the extraction method, an immersion method, a solvent spray method, an ultrasonic method, etc. may be used individually or in combination.
- the content of the diluent remaining in the polyolefin porous substrate after extraction may be 1 wt% or less.
- the extraction time varies depending on the thickness of the polyolefin porous substrate to be prepared, but in the case of a polyolefin porous substrate having a thickness of 10 to 30 ⁇ m, 2 to 4 minutes may be appropriate.
- the heat setting step is to fix the separator and apply heat to forcibly hold the separator to be contracted to remove residual stress.
- the heat setting temperature may be 100 °C to 140 °C, or 105 °C to 135 °C, or 110 °C to 130 °C.
- the polyolefin molecules are rearranged to remove the residual stress of the porous membrane, and the problem of clogging the pores of the polyolefin porous substrate due to partial melting is reduced can do it
- the time of the heat setting temperature may be 10 seconds to 120 seconds, or 20 seconds to 90 seconds, or 30 seconds to 60 seconds.
- the number of double bonds present in the polyolefin chain as measured by H-NMR is 0.01 or more, or 0.5 or less per 1000 carbon atoms. It may be 0.3 or less. Since the polyolefin porous substrate has the number of double bonds in the above range, radicals formed by the hydrogen separation reaction by the photoinitiator from the double bond structure present in the polyolefin chain can be controlled, so that the polyolefin porous substrate can be effectively crosslinked while It may be easy to minimize the occurrence of side reactions due to excessive generation of radicals. In addition, it may be easier to prevent deterioration of the mechanical strength of the finally prepared polyolefin porous substrate containing a cross-linked structure.
- the number of double bonds present in the polyolefin chain can be adjusted by adjusting the type of catalyst, purity, addition of a linker, etc. during polyolefin synthesis.
- the number of double bonds present in the polyolefin chain excluding the ends of the polyolefin porous substrate may be 0.005 to 0.49 per 1000 carbon atoms.
- the polyolefin porous substrate has a BET specific surface area of 10 m 2 /g to 27 m 2 /g, 13 m 2 /g to 25 m 2 /g, or 15 m 2 /g to 23 m 2 /g.
- the BET specific surface area of the polyolefin porous substrate satisfies the above-mentioned range, the surface area of the polyolefin porous substrate increases, so that it may be easier to increase the crosslinking efficiency of the polyolefin porous substrate even with a small amount of the photoinitiator.
- the BET specific surface area of the polyolefin porous substrate may be measured by a BET method. Specifically, the BET specific surface area of the polyolefin porous substrate can be calculated from the amount of nitrogen gas adsorbed under liquid nitrogen temperature (77K) using BELSORP-mino II manufactured by BEL Japan.
- a photoinitiator composition including a photoinitiator is applied to the resultant of step (S5) (S6).
- the photoinitiator may comprise a Type 2 photoinitiator.
- the photoinitiator may be a thioxanthone (TX: Thioxanthone), a thioxanthone derivative, a benzophenone (BPO: Benzophenone), a benzophenone derivative, or a mixture of two or more thereof.
- TX Thioxanthone
- BPO benzophenone
- the thioxanthone derivative is, for example, 2-isopropylthioxanthone, 2-chlorothioxanthone, 2-dodecylthioxanthone, 2,4-diethylthioxanthone, 2,4-dimethylthioxanthone, 1- Methoxycarbonylthioxanthone, 2-ethoxycarbonylthioxanthone, 3-(2-methoxyethoxycarbonyl)-thioxanthone, 4-butoxycarbonyl-thioxanthone, 3-butoxycarbonyl -7-methylthioxanthone, 1-cyano-3-chlorothioxanthone, 1-ethoxycarbonyl-3-chlorothioxanthone, 1-ethoxycarbonyl-3-ethoxythioxanthone, 1- Ethoxy-carbonyl-3-aminothioxanthone, 1-ethoxycarbonyl-3-phenylsulfurylthioxanth
- the benzophenone derivative is, for example, 4-phenylbenzophenone, 4-methoxybenzophenone, 4,4'-dimethoxy-benzophenone, 4,4'-dimethylbenzophenone, 4,4'-dichlorobenzophenone, 4 ,4'-dimethylaminobenzophenone, 4,4'-diethylaminobenzophenone, 4-methylbenzophenone, 2,4,6-trimethylbenzophenone, 4-(4-methylthiophenyl)-benzophenone, 3 ,3'-Dimethyl-4-methoxy-benzophenone, methyl-2-benzoyl benzoate, 4-(2-hydroxyethylthio)-benzophenone, 4-(4-tolylthio)benzophenone, 4-benzoyl -N,N,N-trimethylbenzenemethanaminium chloride, 2-hydroxy-3-(4-benzoylphenoxy)-N,N,N-trimethyl-propanaminium
- the photoinitiator may include 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof.
- the photoinitiator includes 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof, crosslinking is possible even with a lower amount of light than when using a photoinitiator such as benzophenone, for example, at a level of 500 mJ/cm 2 Thus, it may be more advantageous in terms of aspects.
- the photoinitiator includes 2-isopropyl thioxanthone (ITX)
- the melting point of 2-isopropyl thioxanthone (ITX) is as low as about 70 to 80° C., so the photocrosslinking temperature
- the conditions are adjusted to 80 to 100° C., as 2-isopropyl thioxanthone on the surface of the polyolefin porous substrate is melted, mobility of the photoinitiator occurs into the polyolefin porous substrate, thereby increasing crosslinking efficiency, and final preparation It may be easy to prevent a change in the physical properties of the separation membrane.
- the content of the photoinitiator may be 0.01 to 0.5% by weight, or 0.03 to 0.3% by weight, or 0.05% to 0.15% by weight based on 100% by weight of the photoinitiator composition.
- the content of the photoinitiator is within the above range, it may be easier to prevent shrinkage of the separator or main chain scission of the polyolefin from occurring due to a rapid crosslinking reaction upon UV irradiation, while the crosslinking reaction proceeds smoothly It could be easier to be
- the photoinitiator in the step of applying the photoinitiator composition comprising the photoinitiator to the resultant of step (S5), the photoinitiator may be added to an extruder for extruding the polyolefin composition.
- the photoinitiator composition comprising the photoinitiator to the resultant of step (S5)
- the photoinitiator composition comprising the photoinitiator and the solvent is coated on the outside of the polyolefin porous substrate and dried to A separator containing a cross-linked structure for a lithium secondary battery can be manufactured.
- coating and drying on the outside refers not only to the case of coating and drying the photoinitiator composition on the surface of the polyolefin porous substrate, but also the photoinitiator composition on the surface of the other layer after another layer is formed on the polyolefin porous substrate. coated and dried.
- the polyolefin porous substrate may be corona-discharged prior to coating the photoinitiator composition on the polyolefin porous substrate.
- the corona discharge treatment may be performed by applying a high frequency, high voltage output generated by a predetermined driving circuit unit between a predetermined discharge electrode provided in the corona discharge processor and a treatment roll.
- the surface of the polyolefin porous substrate may be modified through the corona discharge treatment, so that the wettability of the polyolefin porous substrate with respect to the photoinitiator composition may be further improved.
- the corona discharge treatment may be performed by an atmospheric pressure plasma method.
- the photoinitiator composition may be a photoinitiator solution consisting of the photoinitiator and the solvent.
- the solvent is cyclic aliphatic hydrocarbons such as cyclopentane and cyclohexane; aromatic hydrocarbons such as toluene, xylene, and ethylbenzene; acetone, ethylmethyl ketone, diisopropyl ketone, cyclohexa Ketones such as non, methylcyclohexane, and ethylcyclohexane; Chlorine-based aliphatic hydrocarbons such as methylene chloride, chloroform, and carbon tetrachloride; Esters such as ethyl acetate, butyl acetate, ⁇ -butyrolactone, ⁇ -caprolactone; acetonitrile, propio Acylnitriles such as nitrile; Ethers such as tetrahydrofuran and ethylene glycol diethyl ether: Alcohols such as methanol, ethanol,
- Non-limiting examples of a method for coating the photoinitiator solution on the polyolefin porous substrate include a dip coating method, a die coating method, a roll coating method, a comma coating method, microgravure ( Microgravure) coating method, doctor blade coating method, reverse roll coating method, Mayer bar coating method, direct roll coating method, and the like.
- the drying step after coating the photoinitiator solution on the polyolefin porous substrate may use a method known in the art, in a temperature range in consideration of the vapor pressure of the solvent used, batchwise or continuously using an oven or a heated chamber. It is possible.
- the drying is to almost remove the solvent present in the photoinitiator solution, which is preferably as fast as possible in consideration of productivity, etc., for example, it may be carried out for a time of 1 minute or less or 30 seconds or less.
- the photoinitiator composition may be a slurry for forming an inorganic hybrid pore layer comprising an inorganic filler, a binder polymer, the photoinitiator, and the solvent.
- the photoinitiator composition is the slurry for forming the inorganic hybrid pore layer
- the photoinitiator composition is coated on the polyolefin porous substrate and the photoinitiator is introduced to the surface of the polyolefin porous substrate to crosslink the polyolefin porous substrate upon UV irradiation.
- An inorganic hybrid pore layer may be formed on at least one surface of the substrate.
- a facility for directly applying the photoinitiator to the polyolefin porous substrate such as a facility for directly coating and drying the photoinitiator composition on the polyolefin porous substrate, etc. is additionally required It is possible to photocrosslink the polyolefin porous substrate by using an inorganic hybrid pore layer forming process without doing so.
- the slurry for forming the inorganic hybrid pore layer does not require other monomers other than the photoinitiator to directly crosslink the polymer chains in the polyolefin porous substrate, so that the photoinitiator is used together with the inorganic filler and the binder polymer to form the inorganic hybrid pore layer slurry Even if included in the monomer, the photoinitiator does not prevent the photoinitiator from reaching the surface of the polyolefin porous substrate, so that the photoinitiator can be sufficiently introduced to the surface of the polyolefin porous substrate.
- the polyolefin porous substrate itself and the inorganic filler have a high ultraviolet blocking effect, and then irradiating ultraviolet rays after forming the inorganic compound hybrid pore layer including the inorganic filler, the amount of ultraviolet irradiation light hitting the polyolefin porous substrate may be reduced.
- the polymer chains in the polyolefin porous substrate can be crosslinked and directly connected.
- the photoinitiator composition when the photoinitiator composition is the slurry for forming the inorganic hybrid pore layer, 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof may be included as the photoinitiator.
- 2-isopropyl thioxanthone or thioxanthone can be optically crosslinked even at a long wavelength with high transmittance. Accordingly, even if the photoinitiator is included in the slurry for forming the inorganic hybrid pore layer including the inorganic filler and the binder polymer, crosslinking of the polyolefin porous substrate may be easy.
- the solvent may serve as a solvent for dissolving the binder polymer depending on the type of the binder polymer, or may serve as a dispersion medium for dispersing the binder polymer without dissolving it. At the same time, the solvent can dissolve the photoinitiator.
- the solvent has a solubility index similar to that of the binder polymer to be used, and a low boiling point may be used. In this case, uniform mixing and subsequent removal of the solvent may be easy. For a non-limiting example of such a solvent, see the above-mentioned solvent.
- the slurry for forming the inorganic hybrid pore layer may be prepared by dissolving or dispersing the binder polymer in the solvent, then adding the inorganic filler and dispersing it.
- the inorganic fillers may be added in a crushed state to have a predetermined average particle diameter in advance, or after adding the inorganic filler to a slurry in which the binder polymer is dissolved or dispersed, the inorganic filler is subjected to a predetermined value using a ball mill method or the like. It may be crushed and dispersed while controlling to have an average particle size. At this time, crushing may be performed for 1 to 20 hours, and the average particle diameter of the crushed inorganic filler may be as described above. As the crushing method, a conventional method may be used, and a ball mill method may be used.
- the slurry for forming the inorganic hybrid pore layer may further include additives such as a dispersant and/or a thickener.
- the additive is polyvinylpyrrolidone (poly(vinylpyrrolidone), PVP), hydroxy ethyl cellulose (HEC), hydroxy propyl cellulose (hydroxy propyl cellulose, HPC), ethylhydroxy ethyl cellulose (EHEC), methyl cellulose (MC), carboxymethyl cellulose (CMC), hydroxyalkyl methyl cellulose ), cyanoethylene polyvinyl alcohol, or two or more of these.
- the solid content of the slurry for forming the inorganic hybrid pore layer may be 5 wt% to 60 wt%, or 30 wt% to 50 wt%.
- the content of the solid content of the slurry for forming the inorganic hybrid pore layer is in the above-mentioned range, it may be easy to secure the coating uniformity, and it will be easy to prevent the slurry from flowing and non-uniformity occurring or taking a lot of energy to dry the slurry.
- a phase separation process may be performed after the photoinitiator composition is coated on the polyolefin porous substrate.
- the phase separation may be carried out in a humidified phase separation or immersion phase separation method.
- the humidified phase separation may be carried out at a temperature in the range of 15 ° C. to 70 ° C. or at a temperature in the range of 20 ° C. to 50 ° C. and relative humidity in the range of 15% to 80% or relative humidity in the range of 30% to 50%.
- the slurry for forming the inorganic hybrid pore layer is dried, it may have a phase change characteristic by a phase separation phenomenon known in the art (vapor-induced phase separation).
- a non-solvent for the binder polymer may be introduced in a gaseous state.
- the non-solvent for the binder polymer is not particularly limited as long as it does not dissolve the binder polymer and has partial compatibility with the solvent, for example, those having a solubility of the binder polymer of less than 5% by weight at 25 ° C. .
- the non-solvent for the binder polymer may be water, methanol, ethanol, isopropanol, butanol, butanediol, ethylene glycol, propylene glycol, tripropylene glycol, or two or more of these.
- the slurry for forming the inorganic hybrid pore layer on the outside of the polyolefin porous substrate After coating the slurry for forming the inorganic hybrid pore layer on the outside of the polyolefin porous substrate, it is immersed in a coagulation solution containing a non-solvent for the binder polymer for a predetermined time. Accordingly, a phase separation phenomenon is induced in the coated inorganic material hybrid pore layer slurry and the binder polymer is solidified. In this process, a porous inorganic compound hybrid pore layer is formed. Thereafter, the coagulation liquid is removed by washing with water and dried. The drying may be performed using a method known in the art, and may be performed in a batch or continuous manner using an oven or a heated chamber in a temperature range in consideration of the vapor pressure of the solvent used. The drying is to almost remove the solvent present in the slurry, which is preferably as fast as possible in consideration of productivity and the like, and may be carried out for, for example, 1
- the coagulation solution only a non-solvent for the binder polymer may be used, or a mixed solvent of a non-solvent for the binder polymer and the solvent as described above may be used.
- the content of the nonsolvent for the binder polymer is 50% by weight compared to 100% by weight of the coagulation solution from the viewpoint of forming a good porous structure and improving productivity may be more than
- an inorganic filler in the step of applying the photoinitiator composition comprising the photoinitiator to the resultant of step (S5), an inorganic filler, a first binder polymer, and a slurry for forming an inorganic hybrid pore layer comprising a dispersion medium Coating and drying at least one surface of the polyolefin porous substrate to form an inorganic hybrid pore layer, and coating a coating solution for forming a porous adhesive layer comprising a second binder polymer, the photoinitiator, and the solvent on the upper surface of the inorganic hybrid pore layer and drying to prepare a separator containing a cross-linked structure for a lithium secondary battery.
- the first binder polymer may be a water-based binder polymer.
- the first binder polymer may be dissolved in an aqueous solvent or dispersed by an aqueous dispersion medium.
- the first binder polymer may be in the form of particles.
- the first binder polymer may not be dissolved in the solvent and the nonsolvent for the second binder polymer to be described later.
- the first binder polymer is not dissolved even if a coating solution to be described later is applied to form the porous adhesive layer after forming the inorganic hybrid pore layer, so that the first binder polymer dissolved in the solvent or the nonsolvent for the second binder polymer has pores It may be easy to prevent the phenomenon of blocking.
- the dispersion medium may serve as a solvent for dissolving the first binder polymer depending on the type of the first binder polymer, or may serve as a dispersion medium for dispersing the first binder polymer without dissolving it.
- the dispersion medium has a solubility index similar to that of the first binder polymer to be used, and a low boiling point may be used. In this case, uniform mixing and subsequent removal of the dispersion medium may be easy.
- the dispersion medium may be an aqueous dispersion medium.
- the dispersion medium is an aqueous dispersion medium, it is environmentally friendly and does not require an excessive amount of heat to form and dry the inorganic hybrid pore layer, and additional explosion-proof facilities are not required, so it may be easier than forming the inorganic hybrid pore layer.
- the drying of the slurry for forming the inorganic hybrid pore layer may be dried by a drying method when manufacturing a conventional separator.
- drying of the coated slurry may be performed by air for 10 seconds to 30 minutes, or 30 seconds to 20 minutes, or 3 minutes to 10 minutes.
- the drying time is performed within the above range, it may have the effect of removing the residual solvent without impairing productivity.
- the solvent may be one that dissolves the second binder polymer in 5 wt% or more, or 15 wt% or more, or 25 wt% or more at 25°C.
- the solvent may be a non-solvent for the first binder polymer.
- the solvent may be one that dissolves the first binder polymer in an amount of less than 5% by weight at 25°C.
- the second binder polymer is 3 based on 100% by weight of the coating solution for forming the porous adhesive layer It may be included in an amount of 30% by weight to 30% by weight, or 5% to 25% by weight.
- the photoinitiator is included in the coating solution for forming the porous adhesive layer, when the coating solution for forming the porous adhesive layer is coated on the upper surface of the inorganic hybrid pore layer, the photoinitiator can be introduced to the surface of the polyolefin porous substrate while simultaneously forming a porous adhesive layer.
- the solvent wets the polyolefin porous substrate.
- the photoinitiator included in the coating solution for forming the porous adhesive layer is introduced to the surface of the polyolefin porous substrate and is present on the surface of the polyolefin porous substrate when irradiated with ultraviolet rays.
- the polyolefin porous substrate can be photocrosslinked by a photoinitiator.
- the method for producing a separator containing a crosslinked structure for a lithium secondary battery is a facility for directly applying a photoinitiator to a polyolefin porous substrate in order to photocrosslink the polyolefin porous substrate, such as a solution containing a photoinitiator polyolefin
- the process can be simplified in that the polyolefin porous substrate can be photocrosslinked by using the porous adhesive layer forming process without additionally requiring equipment for direct coating and drying on the porous substrate.
- the method for manufacturing a separator containing a crosslinked structure for a lithium secondary battery according to an embodiment of the present invention does not require other components such as a monomer for forming radicals in addition to a photoinitiator in order to directly crosslink the polymer chains in the polyolefin porous substrate. Even if it is added to the coating solution for forming a temporary porous adhesive layer, other components do not prevent the photoinitiator from reaching the surface of the polyolefin porous substrate, so that the photoinitiator can be sufficiently introduced to the surface of the polyolefin porous substrate.
- the polyolefin porous substrate itself and the inorganic filler have a high UV-blocking effect, and UV irradiation after forming the inorganic hybrid pore layer and the porous adhesive layer, the amount of UV irradiation light reaching the polyolefin porous substrate may be reduced, but the present invention In , crosslinking is possible even with a small amount of UV irradiation, so that even after the inorganic hybrid pore layer and the porous adhesive layer are formed, even when UV is irradiated, the polymer chains in the polyolefin porous substrate are crosslinked and directly connected.
- the coating solution for forming the porous coating layer may include 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof as the photoinitiator.
- 2-isopropyl thioxanthone or thioxanthone can be optically crosslinked even at a long wavelength with high transmittance. Accordingly, even after the inorganic material-forming pore layer and the porous adhesive layer are formed, crosslinking of the polyolefin porous substrate may be facilitated even when irradiated with ultraviolet rays.
- the finally prepared porous adhesive layer may form a pattern.
- a phase separation process may be performed after the coating solution for forming the porous adhesive layer is coated on the upper surface of the inorganic hybrid pore layer.
- the phase separation may be performed by an immersion phase separation method.
- the coating solution for forming the porous adhesive layer on the upper surface of the inorganic hybrid pore layer After coating the coating solution for forming the porous adhesive layer on the upper surface of the inorganic hybrid pore layer, it is immersed in a coagulation solution containing a non-solvent for the second binder polymer for a predetermined time. Accordingly, a phase separation phenomenon is induced in the coating solution for forming the coated porous adhesive layer, and the second binder polymer is solidified. In this process, a porous adhesive layer is formed. Thereafter, the coagulation liquid is removed by washing with water and dried. The drying may be performed using a method known in the art, and may be performed in a batch or continuous manner using an oven or a heated chamber in a temperature range in consideration of the vapor pressure of the solvent used. The drying is to almost remove the solvent present in the coating solution for forming the porous adhesive layer, which is preferably as fast as possible in consideration of productivity and the like, and may be carried out for, for example, 1 minute or less or 30
- the coagulating solution only a non-solvent for the second binder polymer may be used, or a mixed solvent of a non-solvent for the second binder polymer and the solvent as described above may be used.
- a mixed solvent of a non-solvent and a solvent for the second binder polymer from the viewpoint of forming a good porous structure and improving productivity, the content of the non-solvent for the second binder polymer relative to 100 wt% of the coagulation solution This may be 50% by weight or more.
- the second binder polymer In the process in which the second binder polymer is solidified, the second binder polymer is condensed, thereby preventing the second binder polymer from penetrating into the surface and/or inside of the polyolefin porous substrate, thereby preventing an increase in the resistance of the separator. can do.
- the adhesive layer including the second binder polymer is made porous, the resistance of the separator may be improved.
- the nonsolvent for the second binder polymer may have a solubility in the second binder polymer at 25° C. of less than 5% by weight.
- the nonsolvent for the second binder polymer may also be a nonsolvent for the first binder polymer.
- the nonsolvent for the second binder polymer may have a solubility of less than 5% by weight in the first binder polymer at 25°C.
- the non-solvent for the second binder polymer may include water, methanol, ethanol, propyl alcohol, butyl alcohol, butanediol, ethylene glycol, propylene glycol, tripropylene glycol, or two or more of these. have.
- the immersion may be made for 3 seconds to 1 minute.
- the immersion time satisfies the above-mentioned range, it may be easy to prevent separation of the adhesive layer from occurring because the adhesion between the inorganic hybrid pore layer and the porous adhesive layer is ensured due to proper phase separation.
- the drying of the coating solution for forming the porous adhesive layer may be dried by a drying method in manufacturing a conventional separator. For example, it may be carried out by air for 10 seconds to 30 minutes, or 30 seconds to 20 minutes, or 3 minutes to 10 minutes. When the drying time is performed within the above range, it may have the effect of removing the residual solvent without impairing productivity.
- the porous adhesive layer can be formed in various forms as the inorganic hybrid pore layer and the porous adhesive layer are formed through separate steps. For example, it may be easier to form the porous adhesive layer in the form of a pattern.
- UV ultraviolet rays
- S6 step (S7).
- UV light is irradiated, the polymer chains in the polyolefin porous substrate are crosslinked to obtain a polyolefin porous substrate containing a crosslinked structure.
- UV irradiation uses a UV curing device, and may be performed by appropriately adjusting the UV irradiation time and the amount of irradiation light in consideration of conditions such as the content ratio of the photoinitiator.
- the UV irradiation time and the amount of irradiation light can be set under conditions such that the polymer chains in the polyolefin porous substrate are sufficiently crosslinked to ensure the desired heat resistance, and the separator is not damaged by the heat generated from the UV lamp.
- the UV lamp used in the UV curing device may be appropriately selected from a high-pressure mercury lamp, a metal lamp, a gallium lamp, etc. depending on the photoinitiator used, and the emission wavelength and capacity of the UV lamp may be appropriately selected according to the process. .
- the polymer chain in the olefin polymer porous support can be photo-crosslinked with only a significantly lower amount of UV irradiation compared to the amount of light used for general photocrosslinking. It is possible to increase the applicability of the mass production process of the separator containing the cross-linked structure for secondary batteries.
- the amount of irradiation light of the ultraviolet rays may be in the range of 10 to 1000 mJ/cm 2 , or 50 to 1000 mJ/cm 2 or 150 to 500 mJ/cm 2 .
- 'UV light quantity' may be measured using a portable light quantity meter called a Miltec H type UV bulb and UV power puck.
- a portable light quantity meter called a Miltec H type UV bulb and UV power puck.
- UVA there are three wavelength values for each wavelength: UVA, UVB, and UVC.
- UV corresponds to UVA.
- the measuring method of 'UV light' passes the UV power puck on the conveyor under the same conditions as the sample under the same conditions as the sample, and at this time, the UV light quantity displayed on the UV power puck is referred to as 'UV light quantity'.
- polyolefin chain scission may occur as a side reaction in addition to the silane graft reaction, which is a necessary reaction, and thus mechanical strength may be reduced. could be formed.
- the separator for a lithium secondary battery prepared according to the method for manufacturing a separator for a lithium secondary battery according to an aspect of the present invention does not have the above problems, so it is better than a separator for a lithium secondary battery prepared using a silane crosslinking agent.
- the mechanical strength can be further improved.
- a separator for a lithium secondary battery having a high meltdown temperature and a low shutdown temperature can be manufactured.
- the separator for a lithium secondary battery of the present invention is interposed between the positive electrode and the negative electrode to be manufactured as a lithium secondary battery.
- the lithium secondary battery may have various shapes such as a cylindrical shape, a prismatic shape, or a pouch shape.
- the lithium secondary battery may include a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery.
- the electrode to be applied together with the separator for a lithium secondary battery of the present invention is not particularly limited, and the electrode active material may be prepared in a form bound to the current collector according to a conventional method known in the art.
- a conventional negative electrode active material that can be used for the negative electrode of a conventional lithium secondary battery can be used, and in particular, lithium metal or lithium alloy, carbon, petroleum coke, activated carbon ( Lithium adsorption materials such as activated carbon, graphite, or other carbons are preferable.
- Non-limiting examples of the positive current collector include a foil made of aluminum, nickel, or a combination thereof
- non-limiting examples of the negative current collector include copper, gold, nickel, or a copper alloy or a combination thereof. There are manufactured foils and the like.
- the conductive material used in the negative electrode and the positive electrode may each independently be added in an amount of 1 wt % to 30 wt % based on the total weight of the active material layer.
- a conductive material is not particularly limited as long as it has conductivity without causing a chemical change in the battery.
- graphite such as natural graphite or artificial graphite
- carbon blacks such as acetylene black, Ketjen black, channel black, furnace black, lamp black, and server black
- conductive fibers such as carbon fibers and metal fibers
- carbon fluoride such as aluminum and nickel powder
- metal powders such as aluminum and nickel powder
- conductive whiskeys such as zinc oxide and potassium titanate
- conductive metal oxides such as titanium oxide
- Conductive materials such as polyphenylene derivatives may be used.
- the binders used in the negative electrode and the positive electrode are each independently a component that assists in bonding of the active material and the conductive material and the bonding to the current collector, and is typically 1% by weight based on the total weight of the active material layer. to 30% by weight.
- binders examples include polyvinylidene fluoride (PVdF), polyacrylic acid (PAA), polyvinyl alcohol, carboxyl methyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoro roethylene, polyethylene, polypropylene, ethylene-propylene-dienter polymer (EPDM), sulfonated EPDM, styrene butadiene rubber, fluororubber, various copolymers, and the like.
- PVdF polyvinylidene fluoride
- PAA polyacrylic acid
- CMC carboxyl methyl cellulose
- EPDM ethylene-propylene-dienter polymer
- EPDM ethylene-propylene-dienter polymer
- EPDM ethylene-propylene-dienter polymer
- sulfonated EPDM styrene butadiene rubber
- fluororubber
- the lithium secondary battery may include an electrolyte, and the electrolyte may include an organic solvent and a lithium salt.
- the electrolyte may include an organic solvent and a lithium salt.
- an organic solid electrolyte or an inorganic solid electrolyte may be used as the electrolyte.
- organic solvent examples include N-methyl-2-pyrrolidone, ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma-butyrolactone, 1,2-dimethoxyethane , tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid Triester, trimethoxymethane, dioxolane derivative, sulfolane, methyl sulfolane, 1,3-dimethyl-2-ibidazolidinone, propylene carbonate derivative, tetrahydrofuran derivative, ether, methyl pyropionate, ethyl propionate
- An aprotic organic solvent such as these may be used.
- the lithium salt is a material readily soluble in the organic solvent, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborane, lithium lower aliphatic carboxylate, lithium 4-phenyl borate, imide, etc. can be used. have.
- pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide
- Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N,N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrrole, 2-methoxyethanol, aluminum trichloride, etc. may be added. have.
- a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, or carbon dioxide gas may be further included to improve high-temperature storage characteristics.
- organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphoric acid ester polymers, polyagitation lysine, polyester sulfide, polyvinyl alcohol, polyvinylidene fluoride, A polymer containing an ionic dissociation group or the like can be used.
- Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates, etc. of Li such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 and the like may be used.
- the electrolyte injection may be performed at an appropriate stage during the battery manufacturing process according to the manufacturing process and required physical properties of the final product. That is, it may be applied before assembling the battery or in the final stage of assembling the battery.
- the separator for a lithium secondary battery may be interposed between the positive electrode and the negative electrode of a lithium secondary battery, and is interposed between adjacent cells or electrodes when a plurality of cells or electrodes are assembled to form an electrode assembly can be
- the electrode assembly may have various structures such as a simple stack type, a jelly-roll type, a stack-folding type, and a lamination-stack type.
- a first polyolefin composition was prepared by mixing 30 parts by weight of high-density polyethylene (Daehan Petrochemical, VH035) having a weight average molecular weight of 300,000 as polyolefin and 70 parts by weight of liquid paraffin oil (Kukdong Petrochemical, LP350) as a diluent.
- the first polyolefin composition and the second polyolefin composition are co-extruded to create a flow of the first polyolefin composition/second polyolefin composition in a manifold, passed through a die and a cooling casting roll to form a sheet, and then MD After stretching, biaxial stretching was performed using a tenter-type sequential stretching machine of TD stretching to prepare a polyolefin porous substrate. At this time, both MD draw ratio and TD draw ratio were made into 5.5 times. As for the stretching temperature, MD was 108°C and TD was 123°C.
- Liquid paraffin oil was extracted from the composite sheet thus obtained with methylene chloride and heat-set at 127° C. to prepare a polyolefin porous substrate.
- 2-isopropyl thioxanthone as a photoinitiator in acetone (manufactured by Sigma Aldrich) 0.1% by weight was added to prepare a photoinitiator composition.
- the photoinitiator composition is coated on both sides so that the total coating amount applied to both sides of the porous substrate is 13.5 g/m 2 at 23° C. and 42% relative humidity on a polyethylene porous substrate having a size of 6 cm x 15 cm by dip coating, and 25° C. dried for 1 minute.
- a high-pressure mercury lamp (Litgen high-pressure mercury lamp, LH-250 / 800-A) was irradiated, but the accumulated light amount was 500 mJ/cm 2 , and the UV irradiation intensity was 80% of the UV light source. , and the process line speed was 10 m/min to prepare a polyolefin porous substrate containing a crosslinked structure.
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 1, except for preparing the first polyolefin composition.
- a polyolefin porous substrate was prepared by co-extruding the first polyolefin composition and the second polyolefin composition to control the flow in the form of a first polyolefin composition/second polyolefin composition/first polyolefin composition in a manifold;
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 1.
- a polyolefin porous substrate was prepared by co-extruding the first polyolefin composition and the second polyolefin composition to control the flow in the form of a first polyolefin composition/second polyolefin composition/first polyolefin composition in a manifold;
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 2.
- Pentaerythritol tetrakis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate](Pentaerythritol tetrakis[3-(3,5-di-tert-) as first antioxidant butyl-4-hydroxyphenyl)propionate] (BASF, Irganox 1010) 0.3 parts by weight, tris (2,4-di-t-butylphenyl) phosphite (BASF, Irgafos 168) 0.18 parts by weight as a second antioxidant 2
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 4, except for preparing the polyolefin composition.
- a polyethylene porous film (Toray Co., Ltd., porosity: 45%) having a thickness of 9 ⁇ m was used as it was without any treatment.
- BASF, Irganox 1010 0.03 parts by weight
- tris (2,4-di-t-butylphenyl) phosphite BASF, Irgafos 168) 0.03 parts by weight as a second antioxidant 2
- a polyolefin porous substrate was prepared in the same manner as in Example 4, except that the photoinitiator composition was not applied and UV irradiation was not performed.
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 4, except that the first and second polyolefin compositions did not contain any antioxidants.
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 4, except for preparing the polyolefin composition.
- a polyolefin porous substrate containing a crosslinked structure was prepared in the same manner as in Example 5, except for preparing the polyolefin composition.
- the first polyolefin composition was put into a twin-screw extruder having an L/D of 56, kneaded, and at the same time reacted and extruded at a temperature of 200° C. to prepare a silane-grafted polyethylene composition.
- the silane-grafted polyethylene composition and the second polyolefin composition are co-extruded to make a flow in the form of a silane-grafted polyethylene composition/second polyolefin composition/silane-grafted polyethylene composition in a manifold, and passed through a dia cooling casting roll.
- the polyolefin porous substrate was prepared by molding in a sheet form, and then biaxially stretching using a tenter-type sequential stretching machine of TD stretching after MD stretching. At this time, both MD draw ratio and TD draw ratio were made into 5.5 times. As for the stretching temperature, MD was 108°C and TD was 123°C.
- a diluent was extracted with methyl chloride from the polyolefin porous substrate and heat-set at 127°C. This was placed in a constant temperature and humidity room at 80° C. and 90% humidity for 24 hours to proceed with crosslinking to prepare a polyolefin porous substrate containing a crosslinked structure.
- the antioxidant content for each region of the separation membranes prepared in Examples 1 to 5 and Comparative Examples 1 to 6 is shown in Tables 1 and 2 below.
- the antioxidant content of the first region is expressed as the content of the third antioxidant/the content of the fourth antioxidant
- the antioxidant content of the second region is expressed as the content of the first antioxidant/the content of the second antioxidant it was
- Evaluation Example 1 Measurement of physical properties of polyolefin porous substrate containing crosslinked structure
- Gurley The air permeability (Gurley) was measured by ASTM D726-94 method. Gurley, as used herein, is the resistance to air flow, measured by a Gurley densometer.
- the air permeability values described herein were expressed as the time (seconds) it takes for 100 ml of air to pass through the cross section of 1 in 2 of the polyolefin porous substrate under a pressure of 12.2 inH 2 O, that is, the ventilation time.
- Porosity can be measured by measuring the width/length/thickness of the polyolefin porous substrate to find the volume, measuring the weight, and calculating the volume as a ratio to the weight when the polyolefin porous substrate occupies 100%. have.
- Porosity (%) of polyolefin porous substrate 100 x (1 - sample weight of polyolefin porous substrate / (sample width (50 mm) x length (50 mm) of polyolefin porous substrate) x thickness x density of polyolefin porous substrate)
- a specimen having a size of 50 mm X 50 mm was prepared.
- the air permeability was measured while raising the temperature at a rate of 5 ° C. per minute.
- the air permeability was measured using a reciprocating air permeability meter (Asahi Seiko, model name: EG01-55-1MR) to measure the time (sec) it takes for 100 ml of air to pass through the polyolefin porous substrate at a constant pressure of 0.05 Mpa.
- the temperature at which the air permeability of the polyolefin porous substrate rapidly increases was set as the shutdown temperature.
- the melt-down temperature was measured by thermomechanical analysis (TMA) after taking a sample in the machine direction (MD) of the polyolefin porous substrate. Specifically, a sample of width 4.5 mm x length 8 mm was put into TMA equipment (TA Instrument, Q400), and the temperature was changed from 30 °C to 220 °C at a temperature increase rate of 5 °C/min while a tension of 0.01 N was applied. As the temperature increased, a change in the length of the sample was accompanied, and the temperature at which the sample was cut by rapidly increasing the length was measured.
- TMA thermomechanical analysis
- the degree of crosslinking of the polyolefin porous substrate prepared in Examples 1 and 2 was measured by peeling a 3 ⁇ m-thick portion from one side of the polyolefin porous substrate along a height direction extending from one surface to the other.
- the degree of crosslinking was measured by peeling a 3 ⁇ m thick portion from the other surface along the height direction extending from the other surface of the polyolefin porous substrate to one surface.
- the polyolefin porous substrate prepared in Examples 3 to 5 and Comparative Examples 1 to 6 was peeled off from one side in a height direction extending from one surface to the other, and then a 4 ⁇ m thick portion was peeled off, and then the degree of crosslinking of the non-exfoliated portion was measured. .
- the peeled substrate was again peeled off from one side in a height direction extending from one surface to the other of the polyolefin porous substrate to measure the degree of crosslinking between the peeled portion and the non-exfoliated portion.
- the degree of crosslinking was calculated by the following formula,
- A is the weight of the part remaining after peeling a 3 ⁇ m thick part from one side, a 3 ⁇ m thick part from the other side, a 2 ⁇ m thick part from one side, a 4 ⁇ m thick part from one side, or a 4 ⁇ m thick part from one side
- B is A 3 ⁇ m thick part from one side, a 3 ⁇ m thick part from the other side, a 2 ⁇ m thick part from one side, a 4 ⁇ m thick part from one side, or a 4 ⁇ m thick part from one side was peeled and the remaining part was placed in 70 g of trichlorobenzene at 135 ° C. After being immersed and left at 135°C for 20 hours, it is filtered through a 100-mesh wire mesh, and the insoluble content on the wire mesh is collected and the dry mass after vacuum drying is shown.
- the polyolefin porous substrate containing the cross-linked structure prepared in Examples 1 to 5 contained 0.8 parts by weight or more of the antioxidant compared to 100 parts by weight of the polyolefin included in the second polyolefin composition in the second polyolefin composition.
- the polyolefin porous substrate containing the crosslinked structure has a first region and a second region that differ in the degree of crosslinking by 10% or more, so that the shutdown temperature is similar to Comparative Example 1, which is a polyolefin porous substrate before crosslinking
- Comparative Example 1 is a polyolefin porous substrate before crosslinking
- the second polyolefin composition does not contain any antioxidants, or contains less than 0.8 parts by weight of the antioxidant compared to 100 parts by weight of the polyolefin contained in the second polyolefin composition.
- the polyolefin porous substrate containing polyolefin does not have a region with a different degree of crosslinking by 10% or more, so the meltdown temperature is high compared to Comparative Example 1, which is the polyolefin porous substrate before crosslinking, but the shutdown temperature is increased compared to before crosslinking, and the mechanical strength is lower deterioration could be observed.
- the content of the antioxidant included in the first polyolefin composition is greater than 0.2 parts by weight compared to 100 parts by weight of the polyolefin included in the first polyolefin composition, so cross-linking is not performed well, resulting in melt It was confirmed that the down temperature did not rise significantly.
- the change in air permeability was measured by increasing the temperature by 5 ° C. and changing the air permeability of the separator at 10 second intervals.
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Abstract
Description
Claims (42)
- 고분자 사슬 사이가 직접적으로 연결된 가교구조를 가지는 가교구조 함유 폴리올레핀 다공성 기재로서,상기 폴리올레핀 다공성 기재가 일면에서 타면으로 연장되는 높이 방향으로,상기 일면에 접하는 제1 영역과 상기 제1 영역 외측에서 타면 방향으로 연장되는 제2 영역을 포함하고,상기 제1 영역에 포함된 폴리올레핀과 상기 제2 영역에 포함된 폴리올레핀의 가교도 차이가 10% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제2 영역 외측에서 타면 방향으로 연장되는 제3 영역을 더 포함하고,상기 제2 영역에 포함된 폴리올레핀과 상기 제3 영역에 포함된 폴리올레핀의 가교도 차이가 10% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제1 영역에 포함된 폴리올레핀과 상기 제2 영역에 포함된 폴리올레핀의 가교도 차이가 20% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제1 영역에 포함된 폴리올레핀의 가교도가 상기 제2 영역에 포함된 폴리올레핀의 가교도보다 큰 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제1 영역에 포함된 폴리올레핀의 가교도가 20% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제1 영역에 포함된 폴리올레핀의 가교도가 30% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제2 영역에 포함된 폴리올레핀의 가교도가 0.1% 내지 10%인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 제1 영역은 상기 폴리올레핀 다공성 기재 전체 두께 대비 10% 내지 80%인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제2항에 있어서,상기 제2 영역에 포함된 폴리올레핀과 상기 제3 영역에 포함된 폴리올레핀의 가교도 차이가 20% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제2항에 있어서,상기 제3 영역에 포함된 폴리올레핀의 가교도가 상기 제2 영역에 포함된 폴리올레핀의 가교도보다 큰 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제2항에 있어서,상기 제3 영역에 포함된 폴리올레핀의 가교도가 20% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제2항에 있어서,상기 제3 영역에 포함된 폴리올레핀의 가교도가 30% 이상인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제2항에 있어서,상기 제2 영역은 상기 폴리올레핀 다공성 기재 전체 두께 대비 10% 내지 60%인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항에 있어서,상기 가교구조 함유 폴리올레핀 다공성 기재가 가교 이전의 폴리올레핀 다공성 기재와 비교할 때, 천공 강도(puncture strength)의 변화율이 10% 이하인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재.
- 제1항 내지 제14항 중 어느 한 항에 따른 가교구조 함유 폴리올레핀 다공성 기재를 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제15항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막이 상기 가교구조 함유 폴리올레핀 다공성 기재의 적어도 일면에 위치하며 무기 필러 및 바인더 고분자를 포함하는 무기물 혼성 공극층을 더 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제15항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막이 상기 가교구조 함유 폴리올레핀 다공성 기재의 적어도 일면에 위치하며, 무기 필러 및 제1 바인더 고분자를 포함하는 무기물 혼성 공극층; 및상기 무기물 혼성 공극층 상에 위치하고, 제2 바인더 고분자를 포함하는 다공성 접착층;을 더 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제15항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막의 멜트 다운 온도가 160℃ 이상인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제15항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막의 셧다운 온도가 146℃ 이하인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- (S1) 폴리올레핀, 및 희석제를 포함하는 제1 폴리올레핀 조성물, 및 폴리올레핀, 희석제, 및 산화방지제를 포함하는 제2 폴리올레핀 조성물을 제조하는 단계;(S2) 상기 제1 폴리올레핀 조성물과 제2 폴리올레핀 조성물을 상기 제1 폴리올레핀 조성물의 압출 결과물의 상면에 제2 폴리올레핀 조성물의 압출 결과물이 적층 되게 공압출하는 단계;(S3) 상기 (S2) 단계의 결과물을 시트 형태로 성형 및 연신시켜 폴리올레핀 다공성 기재를 제조하는 단계;(S4) 상기 (S3) 단계의 결과물에서 상기 희석제를 추출하는 단계;(S5) 상기 (S4) 단계의 결과물을 열고정시키는 단계;(S6) 광개시제를 포함하는 광개시제 조성물을 상기 (S5) 단계의 결과물에 적용하는 단계; 및(S7) 상기 (S6) 단계의 결과물에 자외선을 조사하는 단계;를 포함하고,상기 산화방지제가 상기 제2 폴리올레핀 조성물에 포함된 폴리올레핀 100 중량부 대비 0.8 중량부 이상 포함되는 것을 특징으로 하는 제1항에 따른 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 산화방지제가 라디칼 소거제(radical scavenger)인 제1 산화방지제 및 과산화물 분해제(peroxide decomposer)인 제2 산화방지제를 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제21항에 있어서,상기 제1 산화방지제가 상기 제2 폴리올레핀 조성물에 포함된 폴리올레핀 100 중량부 대비 0.5 중량부 이상 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제21항에 있어서,상기 제2 산화방지제가 상기 제2 폴리올레핀 조성물에 포함된 폴리올레핀 100 중량부 대비 0.3 중량부 이상 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 제1 폴리올레핀 조성물이 산화방지제를 더 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제24항에 있어서,상기 산화방지제가 0.2 중량부 이하로 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제24항에 있어서,상기 산화방지제가 0.07 중량부 내지 0.2 중량부로 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제24항에 있어서,상기 제1 폴리올레핀 조성물에 포함되는 산화방지제가 라디칼 소거제(radical scavenger)인 제3 산화방지제 및 과산화물 분해제(peroxide decomposer)인 제4 산화방지제를 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제27항에 있어서,상기 제3 산화방지제가 상기 제1 폴리올레핀 조성물에 포함된 폴리올레핀 100 중량부 대비 0.05 중량부 내지 0.1 중량부로 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제27항에 있어서,상기 제4 산화방지제가 상기 제1 폴리올레핀 조성물에 포함된 폴리올레핀 100 중량부 대비 0.02 중량부 내지 0.1 중량부로 포함되는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 (S2) 단계가 상기 제1 폴리올레핀 조성물의 압출 결과물, 상기 제2 폴리올레핀 조성물의 압출 결과물, 및 상기 제1 폴리올레핀 조성물의 압출 결과물 이 적층되게 공압출하는 단계를 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 광개시제가 Type 2 광개시제를 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 광개시제가 티옥산톤(TX: Thioxanthone), 티옥산톤 유도체, 벤조페논 (BPO: Benzophenone), 벤조페논 유도체, 또는 이들 중 2종 이상을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 광개시제의 함량이 상기 광개시제 조성물 100 중량% 기준으로 0.01 내지 0.5 중량%인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제21항에 있어서,상기 제1 산화방지제가 페놀계 산화방지제, 아민계 산화방지제, 또는 이들의 혼합물을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제21항에 있어서,상기 제2 산화방지제는 인계 산화방지제, 황계 산화방지제, 또는 이들의 혼합물을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제27항에 있어서,상기 제3 산화방지제가 페놀계 산화방지제, 아민계 산화방지제, 또는 이들의 혼합물을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제27항에 있어서,상기 제4 산화방지제가 인계 산화방지제, 황계 산화방지제, 또는 이들의 혼합물을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제34항 또는 제36항에 있어서,상기 페놀계 산화방지제가 2,6-디-t-부틸-4-메틸페놀, 4,4'-티오비스(2-t-부틸-5-메틸페놀), 2,2'-티오 디에틸비스-[3-(3,5-디-t-부틸-4-하이드록시페닐)-프로피오네이트], 펜타에리트리톨-테트라키스-[3-(3,5-디-t-부틸-4-하이드록시페닐)-프로피오네이트](Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 4,4'-티오비스(2-메틸-6-t-부틸페놀), 2,2'-티오비스(6-t-부틸-4-메틸페놀), 옥타데실-[3-(3,5-디-t-부틸-4-하이드록시페닐)-프로피오네이트], 트리에틸렌글리콜-비스-[3-(3-t-부틸-4-하이드록시-5-메틸페놀)프로피오네이트], 티오디에틸렌 비스[3-(3,5-디-t-부틸-4-하이드록시페닐)프로피오네이트], 6,6'-디-t-부틸-2,2'-티오디-p-크레졸, 1,3,5-트리스(4-t-부틸-3-하이드록시-2,6-크실릴)메틸-1,3,5-트리아진-2,4,6-(1H,3H,5H)-트리온, 디옥타데실 3,3'-티오디프로피오네이트, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제35항 또는 제37항에 있어서,상기 인계 산화방지제가 3,9-비스(2,6-디-t-부틸-4-메틸페녹시)-2,4,8,10-테트라옥사-3,9-디포스파스파이로[5,5]운데칸(3,9-Bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane), 비스(2,6-디쿠밀페닐)펜타에리스리톨 디포스파이트(Bis(2,4-dicumylphenyl) pentaerythritol diphosphite), 2,2'-메틸렌비스(4,6-디-t-부틸페닐) 2-에틸헥실 포스파이트(2,2'-Methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexyl phosphite), 비스(2,4-디-t-부틸-6-메틸페닐)-에틸-포스파이트(bis(2,4-di-tert-butyl-6-methylphenyl)-ethyl-phosphite), 비스(2,6-디-t-부틸-4-메틸페닐) 펜타에리스리톨 디포스파이트, 비스(2,4-디-t-부틸페닐)펜타에리스리톨 디포스파이트(bis(2,4-di-t-butylphenyl)Pentaerythritol Diphosphite), 비스(2,4-디쿠밀페닐)펜타에리스리톨디포스파이트, 디스테아릴 펜타에리스리톨 디포스파이트, 트리스(2,4-디-t-부틸페닐) 포스파이트 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제35항 또는 제37항에 있어서,상기 황계 산화방지제는 3,3'-싸이오비스-1,1'-디도데실 에스터(3,3'-thiobis-1,1'-didodecyl ester), 디메틸 3,3'-싸이오디프로피오네이트(Dimethyl 3,3'-Thiodipropionate), 디옥타데실 3,3'-싸이오디프로피오네이트(Dioctadecyl 3,3'-thiodipropionate), 2,2-비스{[3-(도데실싸이오)-1-옥소프로폭시]메틸}프로페인-1,3-디일 비스[3-(도데실싸이오)프로피오네이트](2,2-Bis{[3-(dodecylthio)-1-oxopropoxy]methyl}propane-1,3-diyl bis[3-(dodecylthio)propionate]), 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 제20항에 있어서,상기 자외선의 조사 광량이 10 내지 1000 mJ/cm2 범위인 것을 특징으로 하는 가교구조 함유 폴리올레핀 다공성 기재의 제조 방법.
- 양극, 음극, 및 상기 양극 및 음극 사이에 개재된 분리막을 포함하고,상기 분리막이 제15항에 따른 리튬 이차전지용 가교구조 함유 분리막인 것을 특징으로 하는 리튬 이차전지.
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EP21907182.6A EP4250460A1 (en) | 2020-12-17 | 2021-12-17 | Polyolefin porous substrate containing crosslinked structure, method for preparing same, and crosslinked-structure-containing separator for lithium secondary battery comprising same |
JP2023533756A JP2023552353A (ja) | 2020-12-17 | 2021-12-17 | 架橋構造含有ポリオレフィン多孔性基材、その製造方法、及びそれを含むリチウム二次電池用架橋構造含有分離膜 |
CN202180082054.5A CN116583995A (zh) | 2020-12-17 | 2021-12-17 | 含交联结构的聚烯烃多孔基材、其制造方法以及包含其的锂二次电池用的含交联结构的隔膜 |
US18/266,045 US20240106077A1 (en) | 2020-12-17 | 2021-12-17 | Crosslinked Structure-Containing Polyolefin Porous Substrate, Method for Manufacturing the Same, and Crosslinked Structure-Containing Separator for Lithium Secondary Battery Including the Same |
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EP (1) | EP4250460A1 (ko) |
JP (1) | JP2023552353A (ko) |
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CN115842213A (zh) * | 2022-09-02 | 2023-03-24 | 北京卫蓝新能源科技有限公司 | 嵌入式固态电解质隔膜、制备方法及其应用 |
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JP3828577B2 (ja) * | 1996-03-29 | 2006-10-04 | クライオバツク・インコーポレイテツド | フィルムを選択的に架橋するための組成物及び方法並びにそれから得られる改良されたフィルム物品 |
KR20160129580A (ko) * | 2015-04-30 | 2016-11-09 | 주식회사 엘지화학 | 세퍼레이터의 제조방법 및 이에 의해 제조된 세퍼레이터 |
JP2017050149A (ja) * | 2015-09-02 | 2017-03-09 | 旭化成株式会社 | 二次電池用セパレータ |
KR101792681B1 (ko) * | 2015-11-06 | 2017-11-02 | 삼성에스디아이 주식회사 | 이차 전지용 세퍼레이터 및 이를 포함하는 리튬 이차 전지 |
KR20190082211A (ko) * | 2016-11-07 | 2019-07-09 | 세키스이가가쿠 고교가부시키가이샤 | 다층 발포 시트, 다층 발포 시트의 제조 방법, 및 점착 테이프 |
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- 2021-12-17 WO PCT/KR2021/019349 patent/WO2022131878A1/ko active Application Filing
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JP3828577B2 (ja) * | 1996-03-29 | 2006-10-04 | クライオバツク・インコーポレイテツド | フィルムを選択的に架橋するための組成物及び方法並びにそれから得られる改良されたフィルム物品 |
KR20160129580A (ko) * | 2015-04-30 | 2016-11-09 | 주식회사 엘지화학 | 세퍼레이터의 제조방법 및 이에 의해 제조된 세퍼레이터 |
JP2017050149A (ja) * | 2015-09-02 | 2017-03-09 | 旭化成株式会社 | 二次電池用セパレータ |
KR101792681B1 (ko) * | 2015-11-06 | 2017-11-02 | 삼성에스디아이 주식회사 | 이차 전지용 세퍼레이터 및 이를 포함하는 리튬 이차 전지 |
KR20190082211A (ko) * | 2016-11-07 | 2019-07-09 | 세키스이가가쿠 고교가부시키가이샤 | 다층 발포 시트, 다층 발포 시트의 제조 방법, 및 점착 테이프 |
Cited By (1)
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CN115842213A (zh) * | 2022-09-02 | 2023-03-24 | 北京卫蓝新能源科技有限公司 | 嵌入式固态电解质隔膜、制备方法及其应用 |
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CN116583995A (zh) | 2023-08-11 |
US20240106077A1 (en) | 2024-03-28 |
KR20220087401A (ko) | 2022-06-24 |
EP4250460A1 (en) | 2023-09-27 |
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