WO2022235137A1 - 리튬 이차전지용 가교구조 함유 분리막, 이의 제조 방법, 및 상기 분리막을 구비한 리튬 이차전지 - Google Patents
리튬 이차전지용 가교구조 함유 분리막, 이의 제조 방법, 및 상기 분리막을 구비한 리튬 이차전지 Download PDFInfo
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- WO2022235137A1 WO2022235137A1 PCT/KR2022/006587 KR2022006587W WO2022235137A1 WO 2022235137 A1 WO2022235137 A1 WO 2022235137A1 KR 2022006587 W KR2022006587 W KR 2022006587W WO 2022235137 A1 WO2022235137 A1 WO 2022235137A1
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- WIPO (PCT)
- Prior art keywords
- lithium secondary
- secondary battery
- cross
- separator
- photoinitiator
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- RFVHVYKVRGKLNK-UHFFFAOYSA-N bis(4-methoxyphenyl)methanone Chemical compound C1=CC(OC)=CC=C1C(=O)C1=CC=C(OC)C=C1 RFVHVYKVRGKLNK-UHFFFAOYSA-N 0.000 description 1
- ZWPWLKXZYNXATK-UHFFFAOYSA-N bis(4-methylphenyl)methanone Chemical compound C1=CC(C)=CC=C1C(=O)C1=CC=C(C)C=C1 ZWPWLKXZYNXATK-UHFFFAOYSA-N 0.000 description 1
- HNXWBOWCWPWNPI-UHFFFAOYSA-N bis[2-(2-methoxyethoxy)ethyl] 9-oxothioxanthene-3,4-dicarboxylate Chemical compound C1=CC=C2C(=O)C3=CC=C(C(=O)OCCOCCOC)C(C(=O)OCCOCCOC)=C3SC2=C1 HNXWBOWCWPWNPI-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- WIYGQQIISXRPOW-UHFFFAOYSA-N butyl 7-methyl-9-oxothioxanthene-3-carboxylate Chemical compound C1=C(C)C=C2C(=O)C3=CC=C(C(=O)OCCCC)C=C3SC2=C1 WIYGQQIISXRPOW-UHFFFAOYSA-N 0.000 description 1
- ANJPBYDLSIMKNF-UHFFFAOYSA-N butyl 9-oxothioxanthene-4-carboxylate Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C(C(=O)OCCCC)=CC=C2 ANJPBYDLSIMKNF-UHFFFAOYSA-N 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000003054 catalyst Substances 0.000 description 1
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- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 150000004862 dioxolanes Chemical class 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
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- JNTJRHNDUMUDLI-UHFFFAOYSA-N ethyl 3-(2-morpholin-4-ylpropan-2-yl)-9-oxothioxanthene-1-carboxylate Chemical compound C=1C=2SC3=CC=CC=C3C(=O)C=2C(C(=O)OCC)=CC=1C(C)(C)N1CCOCC1 JNTJRHNDUMUDLI-UHFFFAOYSA-N 0.000 description 1
- GMZGPOQKBSMQOG-UHFFFAOYSA-N ethyl 3-(benzenesulfonyl)-9-oxothioxanthene-1-carboxylate Chemical compound C=1C=2SC3=CC=CC=C3C(=O)C=2C(C(=O)OCC)=CC=1S(=O)(=O)C1=CC=CC=C1 GMZGPOQKBSMQOG-UHFFFAOYSA-N 0.000 description 1
- KMSUHRUWPAUJFI-UHFFFAOYSA-N ethyl 3-amino-9-oxothioxanthene-1-carboxylate Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=C(N)C=C2C(=O)OCC KMSUHRUWPAUJFI-UHFFFAOYSA-N 0.000 description 1
- FYSWAVWEQXQUGO-UHFFFAOYSA-N ethyl 3-chloro-9-oxothioxanthene-1-carboxylate Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=C(Cl)C=C2C(=O)OCC FYSWAVWEQXQUGO-UHFFFAOYSA-N 0.000 description 1
- ZZXHOZDGOWOXML-UHFFFAOYSA-N ethyl 3-ethoxy-9-oxothioxanthene-1-carboxylate Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=C(OCC)C=C2C(=O)OCC ZZXHOZDGOWOXML-UHFFFAOYSA-N 0.000 description 1
- ZFWIVDKRDSZQRR-UHFFFAOYSA-N ethyl 7-methoxy-9-oxothioxanthene-3-carboxylate Chemical compound C1=C(OC)C=C2C(=O)C3=CC=C(C(=O)OCC)C=C3SC2=C1 ZFWIVDKRDSZQRR-UHFFFAOYSA-N 0.000 description 1
- RUTWJXNBRUVCAF-UHFFFAOYSA-N ethyl 7-methyl-9-oxothioxanthene-3-carboxylate Chemical compound C1=C(C)C=C2C(=O)C3=CC=C(C(=O)OCC)C=C3SC2=C1 RUTWJXNBRUVCAF-UHFFFAOYSA-N 0.000 description 1
- PKUZBJXWIOTQFQ-UHFFFAOYSA-N ethyl 9-oxothioxanthene-2-carboxylate Chemical compound C1=CC=C2C(=O)C3=CC(C(=O)OCC)=CC=C3SC2=C1 PKUZBJXWIOTQFQ-UHFFFAOYSA-N 0.000 description 1
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- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002461 imidazolidines Chemical class 0.000 description 1
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- 238000002847 impedance measurement Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 1
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical group [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical group [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- MLCOFATYVJHBED-UHFFFAOYSA-N methyl 9-oxothioxanthene-1-carboxylate Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2C(=O)OC MLCOFATYVJHBED-UHFFFAOYSA-N 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 150000005181 nitrobenzenes Chemical class 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- HPAFOABSQZMTHE-UHFFFAOYSA-N phenyl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)C1=CC=CC=C1 HPAFOABSQZMTHE-UHFFFAOYSA-N 0.000 description 1
- LYXOWKPVTCPORE-UHFFFAOYSA-N phenyl-(4-phenylphenyl)methanone Chemical compound C=1C=C(C=2C=CC=CC=2)C=CC=1C(=O)C1=CC=CC=C1 LYXOWKPVTCPORE-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002459 porosimetry Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000001008 quinone-imine dye Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
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- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
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- 229910052715 tantalum Inorganic materials 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- BHZCMUVGYXEBMY-UHFFFAOYSA-N trilithium;azanide Chemical compound [Li+].[Li+].[Li+].[NH2-] BHZCMUVGYXEBMY-UHFFFAOYSA-N 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 229940117958 vinyl acetate Drugs 0.000 description 1
- UIYCHXAGWOYNNA-UHFFFAOYSA-N vinyl sulfide Chemical group C=CSC=C UIYCHXAGWOYNNA-UHFFFAOYSA-N 0.000 description 1
- 235000015041 whisky Nutrition 0.000 description 1
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- 229910006636 γ-AlOOH Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- 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 separator containing a cross-linked structure for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery having the separator.
- 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, of 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
- the separator serves to electrically insulate the anode and the anode, it must be able to electrically insulate the cathode and the anode even when the battery is subjected to abnormal conditions such as high temperatures. Because this is low, when the temperature of the battery rises above the melting point of the olefin polymer in the battery misuse environment, a melt-down phenomenon may occur and cause ignition and explosion, and the material characteristics and manufacturing process Due to its characteristics, the separator exhibits extreme thermal shrinkage behavior in situations such as high temperatures, and thus has safety problems such as internal short circuits.
- an object of the present invention is to provide a separator containing a cross-linked structure for a lithium secondary battery that is electrochemically stable while having excellent safety at high temperatures.
- Another object to be solved by the present invention is to provide a method for manufacturing a separator containing a crosslinked structure for a lithium secondary battery using a photoinitiator that is electrochemically stable and can effectively crosslink the olefin polymer porous support.
- Another object to be solved by the present invention is to provide a lithium secondary battery having improved capacity degradation after high-temperature storage even with a separator containing a cross-linked structure for a lithium secondary battery.
- 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.
- a separator containing a cross-linked structure for a lithium secondary battery comprising:
- It relates to a separator containing a cross-linked structure for a lithium secondary battery, characterized in that it contains a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery.
- the oxidation potential value of the photoinitiator having an oxidation potential value 0.02 V or more higher than the full charge voltage of the lithium secondary battery may be 4.4 V to 8 V.
- a third embodiment according to the first or second embodiment,
- the content of the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery may be 0.015 parts by weight to 0.36 parts by weight based on 100 parts by weight of the crosslinked structure-containing olefin polymer porous support.
- a fourth embodiment according to any one of the first to third embodiments,
- the cross-linked structure-containing separator for lithium secondary batteries is positioned on at least one surface of the cross-linked structure-containing olefin polymer porous support, and may further include an inorganic hybrid pore layer including an inorganic filler and a binder polymer.
- a fifth embodiment according to any one of the first to third embodiments,
- an inorganic hybrid pore layer in which the cross-linked structure-containing separator for lithium secondary batteries is positioned on at least one surface of the cross-linked structure-containing olefin polymer porous support and includes 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 photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery is thioxanthone (TX: Thioxanthone), a thioxanthone derivative, benzophenone (BPO: Benzophenone), a benzophenone derivative, or It may include two or more of these.
- a seventh embodiment according to any one of the first to sixth embodiments,
- the melt-down temperature of the separator containing a cross-linked structure for a lithium secondary battery may be 160° C. or higher.
- a shutdown temperature of the separator containing a cross-linked structure for a lithium secondary battery may be 145° C. or less.
- a method for manufacturing a separator containing a cross-linked structure for a lithium secondary battery comprising:
- It relates to a method of manufacturing a separator containing a cross-linked structure for a lithium secondary battery, comprising the step of irradiating the olefin polymer porous support with ultraviolet rays.
- the step of preparing a porous olefin polymer support comprising a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery,
- Coating and drying a photoinitiator composition comprising a photoinitiator and a solvent having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery on the outside of the olefin polymer porous support and drying may be included.
- the photoinitiator composition is an inorganic filler, a binder polymer, a photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery, and the solvent. It may be a slurry for forming an inorganic hybrid pore layer.
- an inorganic hybrid pore layer by coating and drying a slurry for forming an inorganic hybrid pore layer comprising an inorganic filler, a first binder polymer, and a dispersion medium on at least one surface of the olefin polymer porous support;
- a second binder polymer, a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery, and a coating solution for forming a porous adhesive layer comprising the solvent is coated on the upper surface of the inorganic hybrid pore layer and drying; may include.
- the oxidation potential value of the photoinitiator having an oxidation potential value 0.02 V or more higher than the full charge voltage of the lithium secondary battery may be 4.4 V to 8 V.
- a fourteenth embodiment according to any one of the ninth to thirteenth embodiments,
- the content of the photoinitiator having an oxidation potential value 0.02 V or more higher than the full charge voltage of the lithium secondary battery may be 0.015 parts by weight to 0.36 parts by weight based on 100 parts by weight of the olefin polymer porous support.
- the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery is thioxanthone (TX: Thioxanthone), a thioxanthone derivative, benzophenone (BPO: Benzophenone), a benzophenone derivative, or It may include two or more of these.
- the amount of irradiation light of the ultraviolet rays may be 10 to 2000 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 for a lithium secondary battery is a separator containing a crosslinked structure for a lithium secondary battery according to any one of the first to eighth embodiments.
- the separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention is electrochemically stable even including a photoinitiator.
- the separator containing 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 has excellent heat resistance.
- the method for manufacturing a separator containing a crosslinked structure for a lithium secondary battery uses a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of a lithium secondary battery to effectively produce an olefin polymer porous support. can be crosslinked.
- the separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has a melt-down temperature of 160° C. or higher and thus has excellent safety at high temperature, and a lithium secondary battery having such a cross-linked structure-containing separator includes a photoinitiator at a high temperature
- the capacity degradation problem after storage is improved, and the capacity characteristic can be equal to or higher than that of the conventional non-crosslinked separator.
- FIG. 1 is a diagram schematically showing a separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention.
- FIG. 2 is a view schematically showing a separator containing a cross-linked structure for a lithium secondary battery according to another embodiment of the present invention.
- a separator containing a cross-linked structure for a lithium secondary battery according to an aspect of the present invention is a separator containing a cross-linked structure for a lithium secondary battery according to an aspect of the present invention.
- the term 'a crosslinked structure in which the polymer chains are directly connected' means that a polymer chain substantially made of an olefin polymer, more preferably a polymer chain made of only an olefin polymer, becomes reactive by the addition of a photoinitiator, so that the polymer chain is It refers to a state in which a direct cross-link is formed with each other. Therefore, the crosslinking reaction that occurs between the 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 is the 'directly connected crosslinking structure between the polymer chains' referred to in the present invention, even if the polymer chain is substantially composed of an olefin polymer or only an olefin polymer. does not apply
- the crosslinked structure-containing porous olefin polymer support may include only a crosslinked structure directly connected between polymer chains, and may not include a crosslinked structure directly connected between the photoinitiator and polymer chains. .
- the crosslinked structure-containing porous olefin polymer support includes only a crosslinked structure in which polymer chains are directly connected, and does not include a crosslinked structure in which a photoinitiator and polymer chains are directly connected.
- the separator having a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has a cross-linked structure-containing olefin polymer porous support having a cross-linked structure directly connected between polymer chains, so that heat resistance can be improved.
- the olefin polymer porous support may be a porous film.
- the olefin polymer is an ethylene polymer; propylene polymer; butylene polymer; pentene polymer; hexene polymer; octene polymer; copolymers of two or more of ethylene, propylene, butene, pentene, 4-methylpentene, hexene, and octene; or mixtures thereof.
- Non-limiting examples of the ethylene polymer include low-density ethylene polymer (LDPE), linear low-density ethylene polymer (LLDPE), high-density ethylene polymer (HDPE), etc., wherein the ethylene polymer has a high crystallinity and a high melting point of the resin. In this case, it may be easier to increase the modulus while having a desired level of heat resistance.
- LDPE low-density ethylene polymer
- LLDPE linear low-density ethylene polymer
- HDPE high-density ethylene polymer
- the weight average molecular weight of the olefin polymer may be 200,000 to 1,500,000, or 220,000 to 1,000,000, or 250,000 to 800,000.
- the weight average molecular weight of the olefin polymer is within the above range, a separation membrane having excellent strength and heat resistance can be finally obtained while ensuring the uniformity and film forming processability of the porous olefin polymer support.
- the weight average molecular weight may be measured by gel permeation chromatography (GPC, PL GPC220, Agilent Technologies) under the following conditions.
- the crosslinking degree of the crosslinked structure-containing olefin polymer porous support is 10% to 45%, or 15% to 40%, or 20% to 35%.
- the crosslinking structure-containing porous olefin polymer support has a degree of crosslinking within the above-mentioned range, it may have a desired level of heat resistance and may more easily increase the modulus.
- the crosslinking degree of the porous olefin polymer support having a cross-linked structure is 20% or more, it may be easier because the melt-down temperature of the porous olefin polymer support having a cross-linked structure is 170° C. or more.
- the degree of crosslinking is calculated by measuring the weight remaining after soaking the olefin polymer porous support containing the crosslinked structure in a xylene solution at 135°C according to ASTM D 2765 and boiling it for 12 hours, and calculating as a percentage of the remaining weight compared to the initial weight. do.
- 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 minimize the problem of deterioration of battery performance at high temperatures and/or high voltages.
- 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 olefin polymer chain except for the terminal” refers to a double bond present throughout the olefin polymer chain except for the end of the olefin polymer chain.
- the term “terminal” refers to a position of a carbon atom connected to both ends of the olefin polymer chain.
- the crosslinked structure-containing porous olefin polymer support may have a thickness of 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 photoinitiator has an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery.
- the photoinitiator has an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery, so that even after the lithium secondary battery is fully charged, the photoinitiator is oxidized to prevent side reactions from occurring.
- the separator containing a cross-linked structure for a lithium secondary battery includes a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of a lithium secondary battery, which is electrochemically stable, including the separator Even after the lithium secondary battery is fully charged, the oxidation reaction of the photoinitiator by the electrochemical environment in the battery does not occur, thereby preventing deterioration of the battery performance.
- full charge voltage of a lithium secondary battery means a voltage when the battery is 100% charged.
- the fully charged voltage of the lithium secondary battery may be, for example, 4.2 V or more, or 4.2 V to 4.7 V.
- the photoinitiator included in the separator When the oxidation potential value of the photoinitiator included in the separator is lower than the full charge voltage of the lithium secondary battery, the photoinitiator is oxidized by the electrochemical environment in the battery when the lithium secondary battery is fully charged and a side reaction occurs.
- the oxidation potential value of the photoinitiator included in the separator is higher than the full charge voltage of the lithium secondary battery, but is not higher than 0.02 V than the full charge voltage of the lithium secondary battery, the basic potential of the negative electrode is 0.02 V, so the lithium secondary battery may still be fully charged.
- the photoinitiator is oxidized by the electrochemical environment in the cell, a side reaction occurs.
- the oxidation potential value of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery is 4.38 V to 8.0 V, or 4.4 to 7.5 V, or 4.4 to It may be 7.0 V.
- the oxidation potential value of the photoinitiator greatly exceeds the full charge voltage of the lithium secondary battery, and after the lithium secondary battery having a separator including the photoinitiator is fully charged In this case, it may be easier to prevent the performance of the battery from being deteriorated.
- the content of the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is 0.015 parts by weight to 100 parts by weight of the crosslinked structure-containing olefin polymer porous support. 0.36 parts by weight, or 0.015 parts by weight to 0.09 parts by weight, or 0.015 parts by weight to 0.07 parts by weight.
- the content of the photoinitiator satisfies the aforementioned range, it may be easier to prevent side reactions from occurring. In addition, it may be easy to prevent an excessive increase in resistance, and when the photoinitiator is dissolved in the electrolyte, it may be easy to prevent excessive increase in the viscosity of the electrolyte.
- the content of the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery based on 100 parts by weight of the porous olefin polymer support is a lithium secondary filling the entire pore volume of the porous olefin polymer support. It can be obtained by measuring the content of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the battery.
- the total pores of the porous olefin polymer support can be calculated from the density of the solvent. Calculate the weight of the solvent contained in the volume, and from the content of the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery contained in the solvent, the lithium secondary compared to 100 parts by weight of the olefin polymer porous support The content of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the battery can be obtained.
- the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is thioxanthone (TX: Thioxanthone), thioxanthone derivatives, benzophenone (BPO: Benzophenone), benzophenone derivatives, or two or more of these.
- 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
- a separator containing a cross-linked structure for a lithium secondary battery includes a porous olefin polymer support having a cross-linked structure having a cross-linked structure directly connected between polymer chains, and an oxidation higher than the full charge voltage of the lithium secondary battery by 0.02 V or more It may be made of a photoinitiator having a potential value.
- the separator containing a cross-linked structure for a lithium secondary battery according to another embodiment of the present invention is located on at least one surface of the cross-linked structure-containing olefin polymer porous support, and may further include an inorganic hybrid pore layer comprising an inorganic filler and a binder polymer. . This is shown in FIG. 1 .
- the inorganic hybrid pore layer 20 may be formed on one side or both sides of the crosslinked structure-containing olefin polymer porous support 10 .
- the inorganic hybrid pore layer 20 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, It is possible to maintain the state in which the inorganic filler and the crosslinked structure-containing porous olefin polymer support 10 are bound by the binder polymer.
- the inorganic hybrid pore layer 20 prevents the cross-linked olefin polymer porous support 10 from exhibiting extreme heat shrinkage behavior at high temperature by an inorganic filler, thereby improving the safety of the separation membrane.
- the thermal contraction rate of the separator in the machine direction and the transverse direction measured after being left at 120° C. for 30 minutes is 20% or less, or 2% to 15%, or 2% to 10%, respectively.
- 'Machine Direction' refers to a longitudinal direction in which the length of the separator is long in the progress direction when the separator is continuously produced
- 'Transverse Direction' is the transverse direction of the machine direction, that is, , refers to a direction perpendicular to the longitudinal direction in which the separation membrane is long in the direction perpendicular to the progress direction when the separation membrane is continuously produced.
- the inorganic filler is not particularly limited as long as it is electrochemically stable. That is, the inorganic filler that can be used in the present invention is not particularly limited as long as the oxidation and/or reduction reaction does not occur in the operating voltage range of the applied electrochemical device (eg, 0 to 5V based on Li/Li + ).
- the ionic conductivity of the electrolyte can 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, preferably 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
- an inorganic filler having lithium ion transport capability 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 lanthanide titanate (Li x La y TiO 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 3) Lithium germanium thiophosphate (Li x Ge y P z S w , 0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1, 0 ⁇ w ⁇ 5) such as , Li 3.25
- Li 3 N etc. Lithium nitride (Li x N y , 0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 2), Li 3 PO 4 -Li 2 S-SiS 2 SiS 2 series glass (Li x Si P 2 S 5 series glass, such as y S z , 0 ⁇ x ⁇ 3, 0 ⁇ y ⁇ 2, 0 ⁇ z ⁇ 4), LiI-Li 2 SP 2 S 5 , etc. (Li x P y S z , 0 ⁇ x ⁇ 3, 0 ⁇ y ⁇ 3, 0 ⁇ z ⁇ 7), or a mixture thereof.
- the average particle diameter of the inorganic filler may be 0.01 ⁇ m to 1.5 ⁇ m.
- the average particle diameter of the inorganic filler satisfies the above-mentioned range, the formation of an inorganic hybrid pore layer having a uniform thickness and appropriate porosity may be facilitated, and the inorganic filler has good dispersibility and a desired energy density.
- 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 the 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 poly (vinylidene fluoride-hexafluoropropylene) (poly (vinylidene fluoride-co-hexafluoropropylene)), poly (vinylidene fluoride-chlorotrifluoroethylene) ( poly(vinylidene fluoride-co-chlorotrifluoroethylene)), poly(vinylidene fluoride-tetrafluoroethylene) (poly(vinylidene fluoride-co-tetrafluoroethylene)), poly(vinylidene fluoride-trichloroethylene) (poly(vinylidene) fluoride-co-trichlorethylene)), acrylic copolymer, styrene-butadiene copolymer, poly(acrylic acid), poly(methylmethacrylate) (poly(methylmethacrylate)), poly(butyl acrylate) (poly(butylacrylate)), poly(vinylacrylate)
- 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 20, but 50:50 to 99.9:0.1, or 60:40 to 99.5:0.5.
- the weight ratio of the inorganic filler and 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 20 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 20 may further include an additive 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 inorganic hybrid pore layer 20 is bound to each other by the binder polymer in a state in which the inorganic fillers are filled and in contact with each other, thereby interstitial volume between the inorganic fillers. volumes) are formed, and the interstitial volume between the inorganic fillers becomes an empty space and may have a structure forming pores.
- the inorganic hybrid pore layer 20 includes a plurality of nodes including the inorganic filler and a binder polymer covering at least a portion of the inorganic filler surface; and the binder of the node. It includes one or more filaments formed in the shape of a thread from a polymer, wherein the filaments have a node connecting portion extending from the node to connect other nodes, and the node connecting portion is derived from the binder polymer It may have a structure in which the plurality of filaments cross each other to form a three-dimensional network structure.
- the average pore size of the inorganic hybrid pore layer 20 may be 0.001 ⁇ m to 10 ⁇ m.
- the average pore size of the inorganic hybrid pore layer 20 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 20 by the capillary flow pore size measurement method, the inorganic hybrid pore layer 20 is separated from the crosslinked structure-containing olefin polymer porous support 10 and separated. It should be measured in a state wrapped in a nonwoven fabric capable of supporting the inorganic hybrid pore layer 20 , in which case the pore size of the nonwoven fabric should be much larger than the pore size of the inorganic hybrid pore layer 20 .
- the porosity of the inorganic hybrid pore layer 20 is 5% to 95%, or 10% to 95%, or 20% to 90%, or 30% to 80%.
- the porosity is the volume calculated by the thickness, width, and length of the inorganic hybrid pore layer 20, and the volume converted to the weight and density of each component of the inorganic hybrid pore layer 20 is subtracted. corresponds to one value.
- the porosity of the inorganic hybrid pore layer 20 was measured using a scanning electron microscope (SEM) image, a mercury porosimeter, or a porosimetry analyzer (Bell Japan Inc, Belsorp-II mini) using nitrogen. It can measure by the BET 6-point method by the gas adsorption flow method.
- the thickness of the inorganic hybrid pore layer 20 may be 1.5 ⁇ m to 5.0 ⁇ m on one side of the crosslinked structure-containing olefin polymer porous support 10 .
- the thickness of the inorganic hybrid pore layer 20 satisfies the above-described range, the cell strength of the battery may be easily increased while excellent adhesion to the electrode.
- a separator containing a cross-linked structure for a lithium secondary battery includes an inorganic hybrid pore layer positioned on at least one surface of the cross-linked 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. This is shown in FIG. 2 .
- the cross-linked structure-containing separator (1') for a lithium secondary battery according to an embodiment of the present invention and a photoinitiator having an oxidation potential value 0.02 V or more higher than the full charge voltage of the lithium secondary battery (not shown) , olefin polymer porous support (10') containing a crosslinked structure having a crosslinked structure directly connected between the polymer chains; an inorganic hybrid pore layer (20') positioned on at least one surface of the crosslinked structure-containing olefin polymer porous support (10') and comprising an inorganic filler and a first binder polymer; and a porous adhesive layer 30 ′ positioned on the inorganic hybrid pore layer 20 ′ and including a second binder polymer.
- the inorganic hybrid pore layer 20' may be formed on one or both surfaces of the crosslinked structure-containing olefin polymer porous support 10'.
- the inorganic hybrid pore layer 20' is 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 between the inorganic fillers) so that the inorganic fillers can maintain a binding state to each other. Including, it is possible to maintain a state in which the inorganic filler and the crosslinked structure-containing porous olefin polymer support 10' by the first binder polymer are bound.
- the inorganic hybrid pore layer 20' prevents the porous olefin polymer support 10' containing a cross-linked structure from exhibiting extreme heat shrinkage behavior at high temperatures by an inorganic filler, thereby improving the safety of the separation membrane.
- 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 first binder polymer may have a glass transition temperature (Tg) of -200 to 200°C of the first binder polymer.
- Tg glass transition temperature
- the first binder polymer may have an ion conductive ability.
- a binder polymer having ion conductivity is used as the first binder polymer, the performance of the battery may be further improved.
- the first binder polymer may be a binder polymer having excellent heat resistance.
- 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 2% to 5%, or 0% to 5%, or 0% to 2%.
- the first binder polymer is an acrylic polymer, polyacrylic acid, styrene butadiene rubber, polyvinyl alcohol, or two or more of them.
- 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 first binder polymer may be in the form of particles.
- 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 may 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 2% to 5%, or 0% to 5%, or 0% to 2%.
- the inorganic hybrid pore layer 20 ′ 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 between the inorganic fillers.
- An interstitial volume is formed, and the interstitial volume between the inorganic fillers becomes an empty space and may have a structure forming pores.
- the porous adhesive layer 30' includes a second binder polymer so that the separator including the inorganic hybrid pore layer 20' can secure adhesion to the electrode.
- the porous adhesive layer 30 ′ has pores, it is possible to prevent an increase in the resistance of the separator.
- the porous adhesive layer 30' may prevent the second binder polymer from penetrating into the surface and/or inside of the porous olefin polymer support 10' containing a cross-linked structure, so that the resistance of the separator is increased. phenomenon can be minimized.
- 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°C to 200°C. When the glass transition temperature of the second binder polymer satisfies the above-described range, mechanical properties such as flexibility and elasticity of the finally formed porous adhesive layer 30 ′ may be improved.
- the second binder polymer may have an ion conductive ability. When a binder polymer having ion conductivity 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-trichlorethylene)), 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 porous adhesive layer 30 ′ may have a pattern including at least one adhesive part including the second binder polymer and at least one uncoated part in which the adhesive part is not formed.
- the pattern may be dot-shaped, stripe-shaped, oblique, wavy, triangular, square, or semi-circular.
- the resistance of the separator may be improved, and the electrolyte may be impregnated through a non-coating region in which the porous adhesive layer 30' is not formed. of electrolyte impregnation can be improved.
- the thickness of the porous adhesive layer 30 ′ 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.
- adhesion to the electrode is excellent, and as a result, the cell strength of the battery may be increased.
- the separator containing 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 may be 160 °C or higher, or 170 °C or higher, or 180 to 230 °C.
- the term "separator for lithium secondary batteries before cross-linking” means 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 located 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 located on at least one surface of the porous olefin polymer support not containing a crosslinked structure and comprising an inorganic filler and the first binder polymer, and the inorganic hybrid pore It refers to a separator positioned on the layer and including a porous adhesive layer including a second binder polymer.
- 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 melt-down temperature.
- TMA thermomechanical analysis
- the shutdown temperature may not increase significantly, and the rate of change thereof may also be small, compared to the separator for a lithium secondary battery prior to conventional cross-linking.
- the melt-down temperature of the separator increases compared to before cross-linking, while the shutdown temperature does not increase significantly, so that 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 145°C or less, or 140°C or less, or 133°C to 140°C.
- a shutdown temperature of 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 cc 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, and the air permeability of the separator is rapidly increased. 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.
- the separator containing a cross-linked structure for a lithium secondary battery has air permeability, basis weight, tensile strength, tensile elongation, puncture strength, electrical resistance, etc. before 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 crosslinked structure for lithium secondary batteries after crosslinking" refers to a separator made of a porous olefin polymer support containing a crosslinked structure; or a cross-linked structure-containing porous olefin polymer support, and a separation membrane including an inorganic hybrid pore layer positioned on at least one surface of the cross-linked structure-containing porous olefin polymer support and including an inorganic filler and a binder polymer; Or a cross-linked structure-containing olefin polymer porous support, an inorganic material hybrid pore layer including an inorganic filler and a first binder polymer located on at least one surface of the cross-linked 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 containing a crosslinked 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 having a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention has a change rate of tensile strength in the machine direction and perpendicular direction of 20% or less, or 0% to 20%, compared with the separator for lithium secondary battery before crosslinking, or 0% to 10%, or 0% to 9%, or 0% to 8%, or 0% to 7.53%.
- the change rate 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 containing a cross-linked structure for a 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 with 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 when the specimen was pulled 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 elongated length until fracture.
- the change in puncture strength is 10% or less, or 0.5% to 10%, or 1% to 9%, compared with the separator for lithium secondary battery before crosslinking, 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 separator containing a cross-linked structure for a lithium secondary battery according to the present invention may be manufactured by the following method, but is not limited thereto.
- a porous olefin polymer support including a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of a lithium secondary battery is prepared.
- a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery may be introduced into the surface of the porous olefin polymer support, and the porous olefin polymer support may be crosslinked upon UV irradiation.
- the "surface of the porous olefin polymer support” may include not only the surface of the outermost layer of the porous olefin polymer support, but also the surface of pores existing inside the porous olefin polymer support.
- the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery directly photocrosslinks the polymer chains in the olefin polymer porous support.
- a photoinitiator having an oxidation potential value of 0.02 V or higher than the full charge voltage of the lithium secondary battery can crosslink the olefin polymer porous support alone without a crosslinking agent or other components such as a co-initiator or a synergist. have.
- the photoinitiator becomes a reactive compound, and this photoinitiator forms a radical in the polymer chain in the olefin polymer porous support to make the polymer chain reactive,
- the polymer chains are directly linked to each other, allowing them to be photocrosslinked.
- a photoinitiator having an oxidation potential value higher than the full charge voltage of the lithium secondary battery by 0.02 V or more is used. Since radicals can be generated in the polymer chains in the polymer chain, a crosslinked structure in which the polymer chains are directly connected can be formed.
- a conventional photoinitiator is used to crosslink the porous olefin polymer support with UV light, the photoinitiator that has not been removed after the crosslinking of the porous olefin polymer support may remain in the separation membrane. Accordingly, there is a problem that the photoinitiator is oxidized/reduced by the electrochemical environment in the battery to cause a side reaction. Therefore, after crosslinking the olefin polymer porous support, a process of removing the photoinitiator was required.
- the method for producing a separator containing a cross-linked structure for a lithium secondary battery uses an electrochemically stable photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of a lithium secondary battery, thereby producing an olefin polymer porous support Even if the photoinitiator remains in the separation film after photocrosslinking, the problem that the photoinitiator is oxidized and causes a side reaction can be prevented. Accordingly, the process of removing the photoinitiator after crosslinking the olefin polymer porous support is not required, and the process can be further simplified. In addition, the polymer chain in the olefin polymer porous support can be directly photocrosslinked, and the problem of deterioration of battery performance due to the remaining photoinitiator can be prevented.
- the content of the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is 0.015 parts by weight to 0.36 parts by weight compared to 100 parts by weight of the olefin polymer porous support. , or 0.015 parts by weight to 0.09 parts by weight, or 0.015 parts by weight to 0.07 parts by weight.
- the content of the photoinitiator satisfies the aforementioned range, it may be easier to prevent side reactions from occurring.
- the photoinitiators are not crosslinked or the photoinitiator and the polymer chain are not crosslinked, and only the polymer chains are crosslinked.
- the content of the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery based on 100 parts by weight of the porous olefin polymer support is a lithium secondary filling the entire pore volume of the porous olefin polymer support. It can be obtained by measuring the content of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the battery.
- the total pores of the porous olefin polymer support can be calculated from the density of the solvent. Calculate the weight of the solvent contained in the volume, and from the content of the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery contained in the solvent, the lithium secondary compared to 100 parts by weight of the olefin polymer porous support The content of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the battery can be obtained.
- the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery includes 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof, including benzophenone
- 2-isopropyl thioxanthone, thioxanthone, or a mixture thereof including benzophenone
- the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery includes 2-Isopropyl thioxanthone (ITX)
- the melting point of ITX is approximately It is low to 70 ° C. to 80 ° C.
- ITX on the surface of the porous olefin polymer support melts, and the mobility of ITX into the porous olefin polymer support occurs.
- Crosslinking efficiency may be increased, and it may be easy to prevent a change in physical properties of a finally manufactured separator.
- the porous olefin polymer support is a conventional method known in the art, for example, a wet method using a solvent, a diluent or a pore former, or a dry method using a stretching method in order to secure excellent air permeability and porosity from the above-mentioned olefin polymer material. It can be prepared by forming pores through
- the number of double bonds present in the olefin polymer chain as measured by H-NMR is 0.01 per 1000 carbon atoms. to 0.5, or 0.01 to 0.3.
- the porous olefin polymer support has the number of double bonds in the above range, it may be easy to prevent side reactions due to excessive radical formation while effectively crosslinking the porous olefin polymer support.
- the number of double bonds present in the chain of the olefin polymer excluding the terminal of the porous olefin polymer support may be 0.005 to 0.49 per 1000 carbon atoms.
- the "double bond present in the olefin polymer chain except for the terminal” refers to a double bond present throughout the olefin polymer chain except for the end of the olefin polymer chain.
- terminal refers to a position of a carbon atom connected to both ends of the olefin polymer, respectively.
- the number of double bonds present in the chain of the olefin polymer can be adjusted by controlling the type, purity, addition of a linker, etc. of the catalyst during the synthesis of the olefin polymer.
- the olefin polymer porous support 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 porous olefin polymer support satisfies the above range, the surface area of the porous olefin polymer support increases by 0.02 V or higher than the full charge voltage of a small amount of lithium secondary battery. Oxidation potential value It may be easier to increase the crosslinking efficiency of the olefin polymer porous support even if a photoinitiator having a
- the BET specific surface area of the porous olefin polymer support can be measured by the BET method. Specifically, the BET specific surface area of inorganic particles can be calculated from the amount of nitrogen gas adsorbed under liquid nitrogen temperature (77 K) using BELSORP-mino II manufactured by BEL Japan.
- the olefin polymer porous support may further include an antioxidant.
- the antioxidant can control the crosslinking reaction between the polymer chains by controlling the radicals formed in the olefin polymer chains.
- Antioxidants are oxidized instead of polymer chains to prevent oxidation of polymer chains or to absorb generated radicals to control crosslinking reactions between polymer chains. Accordingly, the shutdown temperature and mechanical strength of the finally manufactured separator may be affected.
- the content of the antioxidant may be 500 ppm to 20000 ppm, or 1000 ppm to 15000 ppm, or 2000 ppm to 13000 ppm based on the content of the olefin polymer porous support.
- the content of the antioxidant satisfies the above-mentioned range, it is possible to sufficiently control radicals generated excessively by the antioxidant, so that it can be easy to prevent the problem of side reactions, and the surface of the olefin polymer porous support becomes non-uniform. may be easy to prevent. Accordingly, it may be easier for the final prepared separator to have a tensile strength of 1500 kgf/cm 2 or more after being exposed at 180° C. for 1 minute.
- antioxidants are largely divided into radical scavengers that react with radicals generated in olefin polymers to stabilize olefin polymers, and peroxide decomposers that decompose peroxides generated by radicals into stable molecules. can be classified.
- the radical scavenger releases hydrogen to stabilize the radical and becomes a radical itself, 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 the radical scavenger.
- the antioxidant may comprise a first antioxidant that is a radical scavenger and a second antioxidant that is a peroxide decomposer. Since the first antioxidant and the second antioxidant have different working mechanisms, the antioxidant includes the first antioxidant that is a radical scavenger and the second antioxidant that is a peroxide decomposer at the same time, so that unnecessary radicals due to the synergistic effect of the antioxidants Production inhibition may be easier.
- the content of the first antioxidant and the second antioxidant may be the same or different.
- the first antioxidant may include 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], triethylenegly
- the content of the first antioxidant may be 500 ppm to 10000 ppm, or 1000 ppm to 12000 ppm, or 1000 ppm to 10000 ppm based on the content of the olefin polymer porous support.
- the content of the first antioxidant satisfies the above-mentioned range, it may be easier to prevent a problem in which a side reaction occurs due to excessive generation of radicals.
- the second antioxidant may include 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-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 diphosphate), 2,2'-methylenebis(4,6-di-t-butylphenyl) 2-ethylhexyl phosphite (2 ,2'-Methylenebis(4,6-di-tert-buty
- 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 content of the second antioxidant is 500 ppm to 10000 ppm, or 1000 ppm based on the content of the olefin polymer porous support. to 12000 ppm, or 1000 ppm to 10000 ppm.
- the content of the second antioxidant satisfies the above-mentioned range, it may be easier to prevent a problem in which a side reaction occurs due to excessive generation of radicals.
- the antioxidant when the antioxidant simultaneously includes a first antioxidant that is a radical scavenger and a second antioxidant that is a peroxide decomposer, the content of the first antioxidant
- the content of the olefin polymer porous support may be 500 ppm to 10000 ppm, and the content of the second antioxidant may be 500 ppm to 10000 ppm based on the content of the olefin polymer porous support.
- the step of preparing a porous olefin polymer support comprising a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery comprises: the porous olefin polymer support When extruding the olefin polymer composition for forming can do.
- the step of preparing the olefin polymer porous support comprises a photoinitiator composition comprising a photoinitiator and a solvent having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery It may include coating and drying the outside of the olefin polymer porous support.
- coating and drying on the outside refers not only to the case of coating and drying the photoinitiator composition directly on the surface of the porous olefin polymer support, but also to the formation of another layer on the porous olefin polymer support. Including the case where the photoinitiator composition is coated on the surface and dried.
- corona discharge treatment may be performed on the porous olefin polymer support before coating the photoinitiator composition on the porous olefin polymer support.
- 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 porous olefin polymer support may be modified through the corona discharge treatment, so that the wettability of the porous olefin polymer support with respect to the photoinitiator composition may be further improved.
- crosslinking of the olefin polymer porous support can be more efficiently performed even with a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery having the same content.
- the corona discharge treatment may be performed by an atmospheric pressure plasma method.
- 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,
- the content of the photoinitiator having an oxidation potential value higher than the full charge voltage of the lithium secondary battery by 0.02 V or more in the photoinitiator composition is 0.015 parts by weight to 0.36 parts by weight relative to 100 parts by weight of the olefin polymer porous support.
- the amount of the solvent may be 0.01 to 0.5 parts by weight, or 0.02 to 0.45 parts by weight, or 0.25 to 0.4 parts by weight based on 100 parts by weight of the solvent.
- the olefin polymer porous support When the content of the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery satisfies the above-mentioned range based on the solvent, the olefin polymer porous support can be crosslinked and excessive radicals are generated It may be easier to prevent side reactions from occurring.
- the content of the photoinitiator having an oxidation potential value higher than the full charge voltage of the lithium secondary battery by 0.02 V or more in the photoinitiator composition is 0.015 parts by weight compared to 100 parts by weight of the olefin polymer porous support. to 0.36 parts by weight, and at the same time, based on the specific surface area of the porous olefin polymer support, 0.01 mg/m 2 to 1.0 mg/m 2 , or 0.03 mg/m 2 to 0.8 mg/m 2 , or 0.06 mg/m 2 to It may be 0.7 mg/m 2 .
- the olefin polymer porous support can be crosslinked, and side reactions due to excessive radical generation It may be easier to prevent this from happening.
- the content of the photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery based on the specific surface area of the olefin polymer porous support can be measured through NMR analysis.
- the photoinitiator composition may be a photoinitiator solution consisting of a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery and the solvent.
- Non-limiting examples of a method for coating the photoinitiator solution on the olefin polymer porous support include a dip coating method, a die coating method, a roll coating method, a comma coating method, a micro Gravure (Microgravure) coating method, doctor blade coating method, reverse roll coating method, Mayer bar ( Mayer Bar) coating method, direct roll coating method and the like.
- the drying step after coating the photoinitiator solution on the porous olefin polymer support may use a method known in the art, and use an oven or a heated chamber in a temperature range in consideration of the vapor pressure of the solvent used, batchwise or continuously possible in this way
- the drying is to almost remove the solvent present in the photoinitiator solution, 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 seconds or less.
- the photoinitiator composition is an inorganic filler, a binder polymer, a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery, and an inorganic compound comprising the solvent It may be a slurry for forming a pore layer.
- the photoinitiator composition is the slurry for forming the inorganic hybrid pore layer
- the photoinitiator composition is coated on the olefin polymer porous support and the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is an olefin It is introduced into the surface of the porous polymer support to crosslink the porous olefin support when irradiated with ultraviolet light, and at the same time, it is possible to form an inorganic hybrid pore layer on at least one surface of the porous olefin support.
- a photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery is directly applied to the olefin polymer porous support.
- a solution containing a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is directly coated on the olefin polymer porous support and equipment for drying, etc. is not required.
- the olefin polymer porous support can be photocrosslinked using the inorganic hybrid pore layer forming process.
- the slurry for forming the inorganic hybrid pore layer is a monomer other than a photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery in order to directly crosslink the polymer chains in the olefin polymer porous support. does not require As a result, even if the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery is included in the slurry for forming the inorganic hybrid pore layer together with the inorganic filler and the binder polymer, it is higher than the full charge voltage of the lithium secondary battery.
- the oxidation potential is 0.02 V or more higher than the full charge voltage of the lithium secondary battery. ) value can be sufficiently introduced into the surface of the olefin polymer porous support.
- the porous olefin polymer support itself and the inorganic filler have a high UV blocking effect, and then irradiating UV rays after forming the inorganic hybrid pore layer including the inorganic filler, the amount of UV irradiation light reaching the porous olefin polymer support can be reduced.
- the polymer chains in the olefin polymer porous support are cross-linked and can be directly connected. .
- the photoinitiator composition when the photoinitiator composition is the slurry for forming the inorganic hybrid pore layer, 2-isopropyl as a photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery thioxanthone, thioxanthone, or mixtures thereof.
- 2-isopropyl thioxanthone or thioxanthone can be optically crosslinked even at a long wavelength with high transmittance.
- the olefin polymer porous support can be easily cross-linked.
- 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.
- the solvent may dissolve the photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery.
- 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 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 ensure 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 olefin polymer porous support.
- the phase separation may be performed 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 a 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 wt% at 25°C may be used.
- 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 olefin polymer porous support After coating the slurry for forming the inorganic hybrid pore layer on the outside of the olefin polymer porous support, it is immersed in a coagulating 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,
- the coagulating 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 non-solvent for the binder polymer is 50 wt % compared to 100 wt % of the coagulating solution from the viewpoint of forming a good porous structure and improving productivity may be more than
- a photoinitiator composition comprising a photoinitiator and a solvent having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is coated on the outside of the olefin polymer porous support and dried step to do,
- an inorganic hybrid pore layer by coating and drying a slurry for forming an inorganic hybrid pore layer comprising an inorganic filler, a first binder polymer, and a dispersion medium on at least one surface of the olefin polymer porous support;
- a second binder polymer, a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery, and a coating solution for forming a porous adhesive layer comprising the solvent is coated on the upper surface of the inorganic hybrid pore layer and drying; may include.
- 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, it may be easy to uniformly mix and then remove the dispersion medium.
- 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 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 the 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 non-solvent for the second binder polymer is It may be easy to prevent clogging of the pores.
- the first binder polymer may be an aqueous 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 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 to dissolve 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 from 5% to 30% by weight, or from 5% to 25% by weight.
- the coating solution for forming the porous adhesive layer As the photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery is included in the coating solution for forming the porous adhesive layer, the coating solution for forming the porous adhesive layer is coated on the upper surface of the inorganic hybrid pore layer, A photoinitiator having an oxidation potential value of 0.02 V or more higher than the full charge voltage of the lithium secondary battery can be introduced to the surface of the olefin polymer porous support and at the same time form a porous adhesive layer.
- the solvent wets the olefin polymer porous support.
- a photoinitiator having a value is introduced into the surface of the porous olefin polymer support and is 0.02 V higher than the full charge voltage of the lithium secondary battery present on the surface of the porous olefin polymer support when irradiated with ultraviolet light.
- a photoinitiator having a value The olefin polymer porous support may be photocrosslinked.
- the porous olefin polymer support is oxidized by at least 0.02 V higher than the full charge voltage of the lithium secondary battery in order to photocrosslink the porous olefin polymer support.
- Equipment for directly applying a photoinitiator having an oxidation potential value for example, a solution containing a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of a lithium secondary battery is directly applied to the olefin polymer porous support.
- the process can be simplified in that the olefin polymer porous support can be photocrosslinked by using the porous adhesive layer forming process without additionally requiring equipment for coating and drying.
- an oxidation potential value higher than the full charge voltage of the lithium secondary battery by 0.02 V or more in order to directly cross-link the polymer chains in the olefin polymer porous support is 0.02 V or more in order to directly cross-link the polymer chains in the olefin polymer porous support.
- a photoinitiator having a higher oxidation potential value may be sufficiently introduced into the surface of the olefin polymer porous support.
- the porous olefin polymer support itself and the inorganic filler have a high ultraviolet blocking effect, and then irradiating ultraviolet rays after forming the inorganic hybrid pore layer including the inorganic filler, the amount of ultraviolet irradiation light reaching the porous olefin polymer support is reduced.
- cross-linking is possible even with a small amount of ultraviolet irradiation light, so that even when irradiated with ultraviolet light after the inorganic hybrid pore layer and the porous adhesive layer are formed, olefin
- the polymer chains in the porous polymer support may be cross-linked and directly connected.
- the coating solution for forming the porous coating layer is a photoinitiator having an oxidation potential value higher than 0.02 V than the full charge voltage of the lithium secondary battery, 2-isopropyl thioxanthone, thioxanthone, or mixtures thereof.
- 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 olefin polymer porous support can be easily 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 is coated on the upper surface of the inorganic hybrid pore layer, and then 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 seconds or less.
- the coagulation 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 nonsolvent and a solvent for the second binder polymer the content of the nonsolvent for the second binder polymer relative to 100% by weight of the coagulation solution from the viewpoint of forming a good porous structure and improving productivity This may be 50% by weight or more.
- the second binder polymer is condensed in the process of solidifying the second binder polymer, thereby preventing the penetration of the second binder polymer into the surface and/or the inside of the olefin polymer porous support. It is possible to prevent an increase in the resistance of the separator. In addition, the resistance of the separator may be improved by making the adhesive layer including the second binder polymer porous.
- the non-solvent 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 the detachment 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 dispersion medium 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.
- the olefin polymer porous support is irradiated with ultraviolet rays.
- UV light is irradiated, the polymer chains in the porous olefin polymer support are crosslinked to obtain a porous olefin polymer support containing a crosslinked structure having a crosslinked structure in which the polymer chains are directly connected.
- the UV irradiation uses a UV crosslinking device, and appropriately adjusts the UV irradiation time and the amount of irradiation light in consideration of conditions such as the content ratio of a photoinitiator having an oxidation potential value higher than the full charge voltage of the lithium secondary battery by 0.02 V or more can be performed.
- the ultraviolet irradiation time and the amount of irradiation light are set as conditions such that the polymer chains in the olefin polymer porous support are sufficiently crosslinked to ensure the desired heat resistance, and the separation membrane is not damaged by the heat generated by the ultraviolet lamp.
- the ultraviolet lamp used in the ultraviolet crosslinking device is appropriately selected from a high-pressure mercury lamp, a metal lamp, a gallium lamp, etc. according to a photoinitiator having an oxidation potential value that is 0.02 V or more higher than the full charge voltage of the lithium secondary battery used. can be used, and the emission wavelength and capacity of the UV lamp can 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 ultraviolet radiation compared to the amount of light used for general photocrosslinking. It is possible to increase the applicability of the mass production process of a separator containing a cross-linked structure for a secondary battery.
- the amount of irradiation light of the ultraviolet rays is 10 to 2000 mJ/cm 2 , or 30 to 1500 mJ/cm 2 , or 50 to 1000 mJ/cm 2 , or 150 to 500 mJ/cm 2 , or 500 to 1500 mJ/cm 2 .
- the irradiation amount of the ultraviolet light 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.
- Miltec H type UV bulb there are three types of wavelength values for each wavelength: UVA, UVB, and UVC.
- the ultraviolet of the present invention corresponds to UVA.
- the UV power puck is passed on a conveyor under a light source under the same conditions as the sample, and the UV light quantity displayed on the UV power puck is referred to as 'ultraviolet irradiation light quantity'.
- a lithium secondary battery may be manufactured by interposing the separator containing the cross-linked structure for a lithium secondary battery between the positive electrode and the negative electrode.
- the lithium secondary battery including a separator containing a cross-linked structure for a lithium secondary battery according to an embodiment of the present invention, even if a photoinitiator is included, a capacity decrease after storage at a high temperature may not occur.
- the photoinitiator is electrochemically stable under voltage conditions within the operating range of the battery. Even after storage, it may have a similar level of performance to that of a lithium secondary battery including a separator for a lithium secondary battery that does not contain a cross-linked structure after high-temperature storage. Specifically, it may have a capacity reduction rate after high temperature storage similar to that of a lithium secondary battery including a separator for a lithium secondary battery that does not contain a crosslinked structure after high temperature storage.
- a separator for a lithium secondary battery that does not contain a crosslinked structure means a separator including a porous olefin polymer support in which a polymer chain is not crosslinked.
- the separator for a lithium secondary battery that does not contain the cross-linked structure may include a separator made of a porous olefin polymer support without a cross-linked structure in which the polymer chain is not cross-linked; Or a separation membrane comprising: the porous olefin polymer support not containing a cross-linked structure, and an inorganic hybrid pore layer positioned on at least one surface of the porous olefin polymer support not containing a cross-linked structure and including an inorganic filler and a binder polymer; or a porous olefin polymer support without a cross-linked structure, an inorganic hybrid pore layer positioned on at least one surface of the porous olefin polymer support not containing a cross-linked structure and
- 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 containing the cross-linked structure for a lithium secondary battery of the present invention is not particularly limited, and the electrode active material layer including the electrode active material, the conductive material, and the binder is bound to the current collector according to a conventional method known in the art. It can be prepared in the form
- a conventional negative electrode active material that can be used in 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, A lithium adsorbent material such as graphite or other carbons may be used.
- 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 binder used in the negative electrode and the positive electrode is each independently a component that assists in bonding of the active material and the conductive material and 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 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.
- a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and 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 in 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 containing the cross-linked structure for a lithium secondary battery in addition to the general process of winding, lamination, stack, and folding processes of the separator and the electrode are possible do.
- the separator containing a cross-linked structure for a lithium secondary battery may be interposed between the positive electrode and the negative electrode of the lithium secondary battery, and when a plurality of cells or electrodes are assembled to form an electrode assembly, adjacent cells or electrodes may be interposed between them.
- 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.
- the number of double bonds in the polymer chain as measured by H-NMR is 0.2 per 1000 carbon atoms, and an ethylene polymer porous film with a thickness of 6.5 ⁇ m containing 3000 ppm of Irganox1010 and 2000 ppm of Irgafos168 as antioxidants. (Senior, weight average molecular weight: 600,000, porosity: 50%) was prepared.
- Al 2 O 3 powder having a D50 particle size of 600 nm and ⁇ -AlOOH powder having a D50 particle size of 250 nm were mixed in a 9:1 weight ratio and prepared.
- an acrylic emulsion (CSB-130, Toyo Ink) and as a dispersant, sodium carboxymethyl cellulose (CMC-Na) (SG-L02, GLchem) were prepared.
- the inorganic filler was crushed and dispersed to prepare a slurry for forming an inorganic hybrid pore layer.
- the slurry for forming the inorganic hybrid pore layer was coated on both sides of the olefin polymer porous support and dried to form an inorganic hybrid pore layer.
- PVdF-HFP Poly(vinylidene fluoride-hexafluoropropylene) (LBG, Arkema) as a second binder polymer was added to N-methyl-2-pyrrolidone (NMP) as a solvent, and 2 as a photoinitiator -Isopropylthioxanthone (Sigma Aldrich, oxidation potential value: 4.468V) was added in an amount of 0.1 parts by weight based on 100 parts by weight of N-methyl-2-pyrrolidone to prepare a coating solution for forming a porous adhesive layer.
- NMP N-methyl-2-pyrrolidone
- 2 photoinitiator -Isopropylthioxanthone
- the content of the photoinitiator is 0.07 parts by weight based on 100 parts by weight of the olefin polymer porous support, and it is sequentially immersed in a coagulation bath and a water washing bath.
- the coating solution for forming the porous adhesive layer was solidified.
- the coagulation tank contained water as a non-solvent
- the washing tank contained a rinse solution consisting only of water as a non-solvent.
- the resultant is irradiated with a high-pressure mercury lamp (Litgen high-pressure mercury lamp, LH-250/800-A), but irradiated with ultraviolet light so that the accumulated light amount is 500 mJ/cm 2
- a separator containing a cross-linked structure for a secondary battery was obtained.
- Benzophenone (oxidation potential value: 5.383 V) (Sigma Aldrich) was used instead of 2-isopropyl thioxanthone (Sigma Aldrich), and UV irradiation was performed so that the amount of light was 1500 mJ/cm 2 .
- a separator containing a cross-linked structure for a lithium secondary battery was obtained in the same manner as in Example 1.
- the number of double bonds in the polymer chain as measured by H-NMR is 0.2 per 1000 carbon atoms, and an ethylene polymer porous film with a thickness of 6.5 ⁇ m containing 3000 ppm of Irganox1010 and 2000 ppm of Irgafos168 as antioxidants. (Toray Corporation, porosity: 45%) was prepared.
- the upper surface of the olefin polymer porous support coated with the photoinitiator composition was irradiated with UV so that the accumulated light amount, that is, the amount of UV irradiation light was 500 mJ/cm 2 , to obtain a separator containing a cross-linked structure for a lithium secondary battery.
- a separation membrane was obtained in the same manner as in Example 1, except that 2-isopropyl thioxanthone (Sigma Aldrich) was not used.
- Evaluation Example 1 Evaluation of the physical properties of the separator and high-temperature storage test result
- the air permeability was 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 value described here is expressed in terms of the time (seconds) it takes for 100 cc of air to pass through the cross section of the separator 1 in 2 under a pressure of 12.2 inH 2 O, that is, the aeration time.
- the meltdown temperature was measured by thermomechanical analysis (TMA) after taking samples in the machine direction (MD) and the transverse direction (TD) of the separator, respectively. Specifically, a sample of width 4.8 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, the length of the sample was changed, and the length was rapidly increased, and the temperature at which the sample was cut was measured in the machine direction (MD) and the transverse direction (TD), respectively.
- TMA thermomechanical analysis
- the thermal contraction rate is measured by cutting the separator to a size of 50 mm (length) x 50 mm (width) to prepare a test piece, and keeping it in an oven heated to 150 ° C for 30 minutes, after which the specimen is recovered and machine direction and perpendicular direction It was calculated by measuring the changed length for:
- Heat shrinkage (%) after leaving at 150°C for 30 minutes ⁇ (Dimension before shrinkage - Size after shrinkage)/Dimension before shrinkage ⁇ X 100
- the negative electrode slurry was coated on a copper current collector with a loading amount of 3.8 mAh/cm 2 and dried to prepare a negative electrode.
- LiCoO 2 as a cathode active material, Denka black as a conductive material, and polyvinylidene fluoride (PVdF) as a binder were added to N-methylpyrrolidone (NMP) as a solvent in a weight ratio of 85:5:10 to prepare a cathode active material slurry prepared.
- NMP N-methylpyrrolidone
- the cathode active material slurry was coated on a sheet-shaped aluminum current collector and dried to form a cathode active material layer such that the final cathode loading amount was 3.3 mAh/cm 2 .
- the separator of each of the Examples and Comparative Examples was interposed between the negative electrode and the positive electrode prepared as described above, and the non-aqueous electrolyte (1M LiPF 6 , ethylene carbonate (EC)/propylene carbonate (PC)/diethyl carbonate (DEC)) ( Volume ratio: 3:3:4) was injected to prepare a coin cell.
- 1M LiPF 6 ethylene carbonate (EC)/propylene carbonate (PC)/diethyl carbonate (DEC)
- the recovery capacity means the capacity when charging and discharging again after storing the coin cell at 85° C. for 8 hours.
- the separator prepared in Comparative Example 2 has excellent safety at high temperature due to an increase in meltdown temperature, but the voltage and capacity of the battery after high temperature storage using a photoinitiator whose oxidation potential value is not higher than 0.02 V of the full charge voltage of the lithium secondary battery It can be seen that it is very degraded.
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Abstract
Description
Claims (17)
- 리튬 이차전지용 가교구조 함유 분리막으로서,고분자 사슬 사이가 직접적으로 연결된 가교구조를 가지는 가교구조 함유 올레핀고분자 다공지지체, 및상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제를 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제의 산화 전위 값은 4.4 V 내지 8 V인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제의 함량이 상기 가교구조 함유 올레핀고분자 다공지지체 100 중량부 기준으로 0.015 중량부 내지 0.36 중량부인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막이 상기 가교구조 함유 올레핀고분자 다공지지체의 적어도 일면에 위치하며, 무기 필러 및 바인더 고분자를 포함하는 무기물 혼성 공극층을 더 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막이 상기 가교구조 함유 올레핀고분자 다공지지체의 적어도 일면에 위치하고, 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.
- 제1항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제가 티옥산톤(TX: Thioxanthone), 티옥산톤 유도체, 벤조페논 (BPO: Benzophenone), 벤조페논 유도체, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막의 멜트 다운 온도가 160℃ 이상인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 제1항에 있어서,상기 리튬 이차전지용 가교구조 함유 분리막의 셧다운 온도가 145℃ 이하인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막.
- 리튬 이차전지용 가교구조 함유 분리막의 제조 방법으로서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제를 포함하는 올레핀고분자 다공지지체를 준비하는 단계; 및상기 올레핀고분자 다공지지체에 자외선을 조사하는 단계를 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제9항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제를 포함하는 올레핀고분자 다공지지체를 준비하는 단계가,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제 및 용제를 포함하는 광개시제 조성물을 상기 올레핀고분자 다공지지체의 외측에 코팅 및 건조하는 단계를 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제10항에 있어서,상기 광개시제 조성물이 무기 필러, 바인더 고분자, 상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제, 및 상기 용제를 포함하는 무기물 혼성 공극층 형성용 슬러리인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제10항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제 및 용제를 포함하는 광가교용 조성물을 상기 올레핀고분자 다공지지체의 외측에 코팅 및 건조하는 단계가,무기 필러, 제1 바인더 고분자, 및 분산매를 포함하는 무기물 혼성 공극층 형성용 슬러리를 상기 올레핀고분자 다공지지체의 적어도 일면에 코팅 및 건조하여 무기물 혼성 공극층을 형성하는 단계; 및제2 바인더 고분자, 상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제, 및 상기 용제를 포함하는 다공성 접착층 형성용 코팅액을 상기 무기물 혼성 공극층의 상면에 코팅 및 건조하는 단계;를 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제9항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제의 산화 전위 값은 4.4 V 내지 8 V인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제9항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제의 함량이 상기 올레핀고분자 다공지지체 100 중량부 기준으로 0.015 중량부 내지 0.36 중량부인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제9항에 있어서,상기 리튬 이차전지의 만충 전압보다 0.02 V 이상 높은 산화 전위(oxidation potential) 값을 가지는 광개시제가 티옥산톤(TX: Thioxanthone), 티옥산톤 유도체, 벤조페논 (BPO: Benzophenone), 벤조페논 유도체, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 제9항에 있어서,상기 자외선의 조사 광량이 10 내지 2000 mJ/cm2인 것을 특징으로 하는 리튬 이차전지용 가교구조 함유 분리막의 제조 방법.
- 양극, 음극, 및 상기 양극과 음극 사이에 개재된 리튬 이차전지용 분리막을 포함하고,상기 리튬 이차전지용 분리막이 제1항 내지 제8항 중 어느 한 항에 따른 리튬 이차전지용 가교구조 함유 분리막인 것을 특징으로 하는 리튬 이차전지.
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KR20210059582A (ko) | 2019-11-14 | 2021-05-25 | 하이콘 테크놀로지 코포레이션 | 정전용량 방식 터치 패널을 위한 멀티 모드 동작 방법 |
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KR20150071378A (ko) * | 2013-12-18 | 2015-06-26 | 한화토탈 주식회사 | 수지 조성물과, 이를 이용하여 제조된 이차전지용 분리막 및 상기 분리막을 적용한 이차전지 |
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KR20210059582A (ko) | 2019-11-14 | 2021-05-25 | 하이콘 테크놀로지 코포레이션 | 정전용량 방식 터치 패널을 위한 멀티 모드 동작 방법 |
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