WO2013054884A1 - 微多孔膜及びその製造方法 - Google Patents
微多孔膜及びその製造方法 Download PDFInfo
- Publication number
- WO2013054884A1 WO2013054884A1 PCT/JP2012/076447 JP2012076447W WO2013054884A1 WO 2013054884 A1 WO2013054884 A1 WO 2013054884A1 JP 2012076447 W JP2012076447 W JP 2012076447W WO 2013054884 A1 WO2013054884 A1 WO 2013054884A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- microporous membrane
- cellulose
- weight
- fiber
- membrane according
- Prior art date
Links
- 239000012982 microporous membrane Substances 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 83
- 229920002678 cellulose Polymers 0.000 claims description 74
- 239000001913 cellulose Substances 0.000 claims description 73
- 239000000835 fiber Substances 0.000 claims description 73
- 239000003795 chemical substances by application Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 41
- 239000002002 slurry Substances 0.000 claims description 30
- 238000001035 drying Methods 0.000 claims description 27
- 239000003990 capacitor Substances 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 11
- 239000003960 organic solvent Substances 0.000 claims description 8
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 7
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 7
- 229920001477 hydrophilic polymer Polymers 0.000 claims description 6
- 239000002491 polymer binding agent Substances 0.000 claims description 6
- 239000013055 pulp slurry Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical group OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 3
- 239000006061 abrasive grain Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 33
- 229910001416 lithium ion Inorganic materials 0.000 description 33
- 239000002904 solvent Substances 0.000 description 30
- 239000002994 raw material Substances 0.000 description 22
- 229910052744 lithium Inorganic materials 0.000 description 19
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- 239000007787 solid Substances 0.000 description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 17
- 239000000463 material Substances 0.000 description 16
- -1 polypropylene Polymers 0.000 description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 14
- 239000004745 nonwoven fabric Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 239000008151 electrolyte solution Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 239000012528 membrane Substances 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 8
- 210000001787 dendrite Anatomy 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 6
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 238000009835 boiling Methods 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000012209 synthetic fiber Substances 0.000 description 4
- 229920002994 synthetic fiber Polymers 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 239000006230 acetylene black Substances 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002121 nanofiber Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 2
- SNAQINZKMQFYFV-UHFFFAOYSA-N 1-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]butane Chemical compound CCCCOCCOCCOCCOC SNAQINZKMQFYFV-UHFFFAOYSA-N 0.000 description 2
- 229920002749 Bacterial cellulose Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 2
- 241000186514 Warburgia ugandensis Species 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 239000005016 bacterial cellulose Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 206010061592 cardiac fibrillation Diseases 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 239000002482 conductive additive Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002600 fibrillogenic effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004627 regenerated cellulose Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 2
- 229940058015 1,3-butylene glycol Drugs 0.000 description 1
- RRQYJINTUHWNHW-UHFFFAOYSA-N 1-ethoxy-2-(2-ethoxyethoxy)ethane Chemical compound CCOCCOCCOCC RRQYJINTUHWNHW-UHFFFAOYSA-N 0.000 description 1
- CNJRPYFBORAQAU-UHFFFAOYSA-N 1-ethoxy-2-(2-methoxyethoxy)ethane Chemical compound CCOCCOCCOC CNJRPYFBORAQAU-UHFFFAOYSA-N 0.000 description 1
- RERATEUBWLKDFE-UHFFFAOYSA-N 1-methoxy-2-[2-(2-methoxypropoxy)propoxy]propane Chemical compound COCC(C)OCC(C)OCC(C)OC RERATEUBWLKDFE-UHFFFAOYSA-N 0.000 description 1
- FPZWZCWUIYYYBU-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl acetate Chemical compound CCOCCOCCOC(C)=O FPZWZCWUIYYYBU-UHFFFAOYSA-N 0.000 description 1
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 description 1
- HHAPGMVKBLELOE-UHFFFAOYSA-N 2-(2-methylpropoxy)ethanol Chemical compound CC(C)COCCO HHAPGMVKBLELOE-UHFFFAOYSA-N 0.000 description 1
- HRWADRITRNUCIY-UHFFFAOYSA-N 2-(2-propan-2-yloxyethoxy)ethanol Chemical compound CC(C)OCCOCCO HRWADRITRNUCIY-UHFFFAOYSA-N 0.000 description 1
- COBPKKZHLDDMTB-UHFFFAOYSA-N 2-[2-(2-butoxyethoxy)ethoxy]ethanol Chemical compound CCCCOCCOCCOCCO COBPKKZHLDDMTB-UHFFFAOYSA-N 0.000 description 1
- WAEVWDZKMBQDEJ-UHFFFAOYSA-N 2-[2-(2-methoxypropoxy)propoxy]propan-1-ol Chemical compound COC(C)COC(C)COC(C)CO WAEVWDZKMBQDEJ-UHFFFAOYSA-N 0.000 description 1
- MXVMODFDROLTFD-UHFFFAOYSA-N 2-[2-[2-(2-butoxyethoxy)ethoxy]ethoxy]ethanol Chemical compound CCCCOCCOCCOCCOCCO MXVMODFDROLTFD-UHFFFAOYSA-N 0.000 description 1
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 description 1
- WOMTYMDHLQTCHY-UHFFFAOYSA-N 3-methylamino-1,2-propanediol Chemical compound CNCC(O)CO WOMTYMDHLQTCHY-UHFFFAOYSA-N 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- XOBKSJJDNFUZPF-UHFFFAOYSA-N Methoxyethane Chemical compound CCOC XOBKSJJDNFUZPF-UHFFFAOYSA-N 0.000 description 1
- 229920001046 Nanocellulose Polymers 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000021736 acetylation Effects 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 235000019437 butane-1,3-diol Nutrition 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229920006319 cationized starch Polymers 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000002447 crystallographic data Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 229940019778 diethylene glycol diethyl ether Drugs 0.000 description 1
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 description 1
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 description 1
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 description 1
- 238000001523 electrospinning Methods 0.000 description 1
- 238000010041 electrostatic spinning Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 229920013821 hydroxy alkyl cellulose Polymers 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 238000007603 infrared drying Methods 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003208 petroleum Substances 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
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920000131 polyvinylidene Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000002459 porosimetry Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007652 sheet-forming process Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/20—Manufacture of shaped structures of ion-exchange resins
- C08J5/22—Films, membranes or diaphragms
- C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
- C08J5/2212—Natural macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/26—Cellulose ethers
- C08L1/28—Alkyl ethers
- C08L1/286—Alkyl ethers substituted with acid radicals, e.g. carboxymethyl cellulose [CMC]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/02—Diaphragms; Separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- 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
- H01M50/429—Natural polymers
- H01M50/4295—Natural cotton, cellulose or wood
-
- 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
- H01M50/44—Fibrous 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/494—Tensile strength
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a microporous membrane and a method for producing the same, and more particularly to a cellulose microporous membrane suitable for a separator for an electrochemical element and a method for producing the same.
- an electrochemical element is an electrochemical element provided with a positive electrode, a negative electrode, and a separator.
- various secondary batteries such as a lithium ion secondary battery and a polymer lithium battery, an aluminum electrolytic capacitor, Examples include various capacitors such as multilayer capacitors and lithium ion capacitors.
- a lithium ion secondary battery As a secondary battery for driving an electric vehicle, in general, a lithium ion secondary battery is currently employed from the relationship between output and energy density. On the other hand, each company is devoted to the development of next-generation batteries from the viewpoint of higher energy density, power output, safety, etc., and this is a field where a large market is expected.
- lithium ion secondary batteries not only lithium ion secondary batteries but also other secondary batteries, primary batteries, capacitors (capacitors), etc., separators made of paper, non-woven fabric, microporous film or the like are used.
- the performance required for the separator is prevention of short circuit between the positive and negative electrodes, chemical stability against the electrolyte, low internal resistance, and the like. These required performances are different in degree required for each device, but are also commonly required for separators regardless of the type.
- the separator of most lithium ion secondary batteries employs a microporous membrane made of a polymer organic compound such as polypropylene or polyethylene.
- These microporous membranes have several characteristics suitable for lithium ion secondary batteries. For example, 1) It is chemically stable to the electrolyte and does not cause a fatal defect due to the separator. 2) Since the thickness of the separator can be designed freely, it is possible to provide a separator that meets various requirements. 3) Since the pore size can be designed to be small, the lithium barrier property is excellent, and a short circuit due to lithium dendrite hardly occurs. 4) When a lithium ion secondary battery undergoes thermal runaway, the pores become narrower due to melting of polypropylene or polyethylene, and initial thermal runaway can be suppressed. It is such a point.
- the separator is a material that occupies 20% of the battery cost, and the current situation is that further cost reduction is required.
- the main roles of the separator in the electric double layer capacitor are prevention of short-circuiting of electrodes (separation), not hindering movement of ions in the electrolytic solution (low internal resistance), and the like.
- the microporous film as described above has a high density, the internal resistance tends to increase.
- it is also known to use a nonwoven fabric as a capacitor separator but there is a problem that the internal resistance increases when the fiber diameter is reduced or the fiber density is increased in order to maintain the separation property. Therefore, development of a separator with low internal resistance is desired.
- Manufacturing methods of polymer microporous membranes such as polypropylene and polyethylene are roughly divided into a wet method and a dry method.
- Each manufacturing method has its characteristics, and the wet method is a method in which micropores are formed by adding a plasticizer to a polymer such as polyethylene and forming a film, then biaxially stretching, and washing the plasticizer with a solvent. Yes.
- This method is excellent in adjusting the size and film thickness of the pores and can meet various requirements for each type of battery, but the manufacturing process is complicated and the cost is high.
- a polymer such as polyolefin is dissolved, extruded onto a film, and annealed to be stretched at a low temperature to form pores at an initial stage, and then stretched at a high temperature to make it porous.
- This method is advantageous in that polymers having different melting points can be laminated and the cost is low because the process is simple, but there is a problem in that the accuracy of pore adjustment and film thickness adjustment is lacking. .
- a separator using a nonwoven fabric made of synthetic fibers, inorganic fibers, etc. in addition to the polymer microporous film has also been proposed.
- Conventional nonwoven fabrics include dry nonwoven fabrics and wet nonwoven fabrics, both of which have been used as separators.
- dry nonwoven fabrics that do not provide uniform fiber distribution should be used because of their low electrode isolation effect. It is said that it is not possible.
- wet nonwoven fabrics are characterized by a uniform fiber distribution compared to dry nonwoven fabrics, and the porosity can be adjusted to be higher than microporous films due to the characteristics of the manufacturing method. Is possible.
- the lithium ion secondary battery is characterized in that it produces lithium dendrite on the negative electrode side, and this lithium dendrite has a characteristic that it is likely to be produced on the surface of the negative electrode through which many lithium ions in the separator pass.
- the location where lithium dendrite is likely to occur is rough, so the barrier property that suppresses short-circuiting when lithium dendrite is generated is compared with the film type. It is said to be low.
- Patent Document 1 Japanese Patent Laid-Open No. 11-040130
- the pore size is regulated within a certain range.
- the pore size depends on the fiber diameter, it is necessary to reduce the fiber diameter in order to control the pore size to be small.
- the current technology makes the fibers of nano-order size inexpensively. Since it is difficult to control the pore size suitable for lithium ion secondary batteries even if synthetic fibers such as ultrafine are used, it is impossible to improve the lithium blocking characteristics. Can not.
- Patent Document 2 Japanese Patent No. 4425576
- Patent Document 3 Japanese Patent No. 4201308 describes that since hydroxyl groups of cellulose are not electrochemically stable, they are stabilized by acetylation treatment to make them suitable for lithium ion secondary batteries.
- Patent Document 3 Japanese Patent No. 4201308 describes that since hydroxyl groups of cellulose are not electrochemically stable, they are stabilized by acetylation treatment to make them suitable for lithium ion secondary batteries.
- cellulose-based separators since there is a track record that cellulose-based separators have been used experimentally in some lithium ion secondary batteries, the electrochemical stability of cellulose itself in lithium ion secondary batteries is a problem. Must not.
- Patent Document 4 Japanese Patent No. 4628764
- a separator using cellulose nanofibers is also proposed.
- a method using bacterial cellulose is reliable as described in Patent Document 4 and the like.
- a method for obtaining cellulose fibers industrially using bacterial cellulose has not been established, and there are unclear points in terms of production cost, and although it is an effective means for making an inexpensive sheet. Absent.
- Patent Document 4 also describes means for using natural cellulose. However, when natural cellulose is uniformly processed to 1000 nm or less, fibrillation proceeds to increase water retention, and as a raw material for papermaking, viscosity is used.
- paper making is performed using a filter cloth or a mesh in the sheet forming process, but with this method, the filter cloth surface is transferred during dehydration, so that irregularities of several ⁇ m are formed on the transfer surface side. Therefore, it is not preferable because when it is incorporated in a lithium ion secondary battery, the adhesion with the electrode becomes insufficient and the performance of the battery may be deteriorated.
- Patent Document 5 Japanese Patent Laid-Open No. 2010-090486 proposes a sheet in which an oily compound is emulsified using fine cellulose fibers and the air resistance is controlled within a certain range.
- an oily compound is emulsified to open holes, but the emulsion breaks when moisture in the drying process volatilizes, and large pores of 1 ⁇ m or more can be made uneven in the sheet.
- the lithium barrier property is deteriorated and a short circuit due to lithium dendrite is likely to occur, so that it cannot be used for a lithium ion secondary battery.
- the present invention has been made in view of the above-described situation, is excellent in performance as a separator, is inexpensive, and can be suitably used as a separator for an electrochemical element that is also excellent in strength characteristics.
- An object is to provide a microporous membrane made of cellulose.
- a cellulose microporous film having specific physical properties is excellent in performance as a separator for an electrochemical device, and has completed the present invention.
- the present invention is a microporous membrane made of cellulose fibers,
- the fiber having a thickness of 1 ⁇ m or more is contained in the cellulose fiber by 5% by weight or more based on the total weight of the cellulose fiber,
- the tensile strength is 50 N ⁇ m / g or more and / or the tear strength is 0.40 kN / m or more
- the present invention relates to a microporous membrane.
- the microporous membrane of the present invention preferably has a porosity of 30 to 70%.
- the microporous membrane of the present invention preferably has a volume resistivity measured by using an alternating current of 20 kHz in a state impregnated with a 1 mol / LiPF 6 / propylene carbonate solution of 1500 ⁇ ⁇ cm or less.
- the microporous membrane of the present invention is preferably obtained from a slurry containing a hydrophilic pore-opening agent together with the cellulose fibers.
- the solubility of the hydrophilic pore-opening agent in water is preferably 10% by weight or more.
- the hydrophilic pore-opening agent is preferably a glycol ether.
- the slurry preferably contains a hydrophilic polymer binder at a ratio of 3 to 80 parts by weight with respect to 100 parts by weight of cellulose fibers.
- the present invention also relates to an electrochemical element separator comprising the microporous membrane. Furthermore, this invention relates also to electrochemical elements, such as a battery and a capacitor, provided with the said separator for electrochemical elements.
- the present invention also provides: Applying a slurry containing at least 5% by weight of a fiber having a thickness of 1 ⁇ m or more based on the total weight of the cellulose fiber and a hydrophilic pore-opening agent on the substrate; Drying the slurry to form a sheet on the substrate; and
- the present invention also relates to a method for producing the above microporous membrane comprising a step of peeling the sheet from the substrate to obtain a cellulose microporous membrane comprising the sheet.
- the method for producing a microporous membrane of the present invention preferably further comprises a step of washing the sheet or microporous membrane with an organic solvent.
- the cellulose fibers are subjected to a refining process in which pulp slurry that has been beaten in advance is passed through a rubbing portion of an abrasive plate rubbing apparatus in which a plurality of abrasive plates each having a grain size of 16 to 120 are disposed. It is preferable.
- the cellulose fiber has been subjected in advance to a refinement treatment in which a pulp slurry that has been beaten in advance is subjected to a high-pressure homogenizer treatment.
- the cellulose microporous membrane of the present invention is excellent in performance as a separator for electrochemical devices. Therefore, by using the microporous membrane made of cellulose of the present invention, a separator for an electrochemical element having a high lithium barrier property, which has been difficult with a nonwoven fabric, paper, etc., and having a low volume resistivity is manufactured at a low cost. It becomes possible to do.
- the cellulose microporous membrane of the present invention has high tensile strength and / or tear strength, and has excellent strength characteristics as a separator for electrochemical devices.
- the pore diameter and the pore volume of the microporous membrane made of cellulose can be freely designed. It is possible to obtain a cellulose microporous membrane suitable for an electrochemical device separator having characteristics and low impedance or low volume resistivity, and the obtained cellulose microporous membrane Has excellent strength characteristics, and furthermore, such a microporous membrane made of cellulose can be produced at low cost.
- the microporous membrane of the present invention is a microporous membrane made of cellulose fibers,
- the cellulose fiber contains a fiber having a thickness of 1 ⁇ m or more in an amount of 5% by weight or more based on the total volume of the cellulose fiber,
- the tensile strength is 50 N ⁇ m / g or more and / or the tear strength is 0.40 kN / m or more.
- Cellulose fibers usable in the present invention are not particularly limited to cellulose types such as cellulose type I and cellulose type II, but cellulose type I natural fibers such as cotton, cotton linter and wood pulp are preferred. . Cellulose II type fibers typified by regenerated cellulose are not preferred because they have a lower crystallinity than cellulose I type fibers and tend to be shortened during fibrillation treatment.
- the cellulose fiber may be microfibrillated.
- the apparatus for microfibrillation treatment of cellulose fibers is not particularly limited.
- high-pressure homogenizer treatment high-pressure dispersion treatment using a Menton-Gorin type disperser
- Lanier-type pressure homogenizer Lanier-type pressure homogenizer
- ultrahigh-pressure homogenizer treatment artemizer
- dispersers such as bead mills and meteor mills
- mass colliders abrasive plate rubbing equipment in which a plurality of abrasive discs with grain sizes of 16 to 120 are rubbed together, Masuko Sangyo Co., Ltd.
- Homogenizer etc.
- the cellulose fiber used in the present invention is an abrasive plate rubbing plate in which a plurality of abrasive plates each having an abrasive grain size of 16 to 120 are rubbed together.
- the rubbing part of the combined apparatus is subjected to a refining process in which a pulp slurry preliminarily beaten is passed, or a finer process in which a pulp slurry preliminarily beaten is subjected to a high-pressure homogenizer.
- 5% by weight or more of fibers having a diameter of 1 ⁇ m or more with respect to the total weight of the cellulose fibers to be used is contained, and preferably 10% by weight or more is contained.
- a slurry is prepared and used only with fine cellulose fibers having a fiber diameter of less than 1 ⁇ m so that the viscosity of the slurry becomes extremely high. Difficult to do.
- it is necessary to reduce the concentration of the slurry, which increases the cost of drying the solvent used and the like, which is not economical.
- the fiber length tends to be shortened and the tear strength of the prepared sheet tends to be lowered. Therefore, the tear strength of the sheet
- fibers other than fibers having a thickness of 1 ⁇ m or more it is also possible to use very thin nanofibers of about several nanometers as long as the viscosity can be cast by a slurry concentration of 1 wt% or more. .
- content of the fiber which has a diameter of 1 micrometer or more with respect to the total weight of the cellulose fiber used is 30 weight% or less. If fibers having a thickness of 1 ⁇ m or more are present in an amount of more than 30% by weight, the number of contacts at which the cellulose fibers contact each other by hydrogen bonding is decreased, which may undesirably decrease the tensile strength.
- content of the fiber having a diameter of 1 ⁇ m or more to 5 wt% or more and 30 wt% or less, it is possible to achieve both tensile strength and tear strength.
- Cellulose fibers can be uniformly dispersed in water due to the hydroxyl groups of cellulose molecules, but the viscosity of the slurry depends on the fiber length and surface area of the cellulose fibers. As the cellulose fibers become thinner, the surface area of the cellulose increases accordingly, and the viscosity of the slurry inevitably increases. Further, as the fiber length becomes longer, the interaction between fibers increases, which is also considered as a factor that leads to an increase in viscosity. The increase in viscosity due to these interactions is a factor that hinders the formation of a sheet at a high concentration, and means for decreasing the concentration is generally taken to handle nanocellulose.
- cellulose fibers have the property of hydrogen bonding between fibers in the dehydration process due to their hydroxyl groups, and there are characteristics not found in non-woven fabrics made of synthetic fibers other than regenerated cellulose. While the strength is developed in the hydrogen bond formation process, the shrinkage in the drying process is greater than that of the nonwoven fabric using synthetic fibers due to the interaction between the fibers. In particular, as the fiber diameter becomes thinner, the stiffness of the fiber decreases, and this contraction is noticeable. In addition, it is known that a sheet prepared using extremely fibrillated fibers is transparent because the fibers are completely in close contact with each other. In other words, it is difficult to make a porous sheet rather than controlling the pore diameter only by reducing the fiber diameter.
- the pore diameter depends on the fiber thickness, the pore diameter is controlled only by the fiber thickness, and the desired pore diameter can be obtained without using a uniform fiber. It cannot be done, and time and cost are required also for the processing process of a cellulose fiber.
- the cellulose microporous membrane of the present invention has excellent strength characteristics. Specifically, the tensile strength of the microporous membrane made of cellulose of the present invention is 50 N ⁇ m / g or more and / or the tear strength is 0.40 kN / m or more.
- the tensile strength can be measured according to JIS C2151.
- the tear strength can be measured by the trouser tear method according to JIS K7128-1.
- the tensile strength is preferably 55 N ⁇ m / g or more, and more preferably 60 N ⁇ m / g or more.
- the tear strength is preferably 0.5 kN / m or more, more preferably 0.55 kN / g or more, and even more preferably 0.6 kN / m or more.
- a cellulose fiber constituting a microporous membrane made of cellulose has a thickness of 1 ⁇ m or more. Since 5% by weight or more of the fiber is contained based on the total weight of the cellulose fiber, both the tensile strength and the tear strength can be made excellent.
- the maximum value of the pore diameter measured by mercury porosimetry is preferably 1.5 ⁇ m or less. Since the particle diameter of the electrode active material used in an electrochemical element such as a lithium ion battery has various sizes, the pore diameter does not necessarily have to be small. As a rough standard, it is said that a short circuit does not occur if the pore diameter is 1/4 of the particle diameter of the active material used. On the other hand, when used for an electrochemical device using an active material having a small particle size, the maximum value may need to be smaller than 1.5 ⁇ m.
- the air resistance per 10 ⁇ m thickness is 20 to 600 seconds (/ 100 cc), preferably 20 to 450 seconds, and more preferably 30 to 250 seconds.
- the air resistance can be measured based on JIS P8117.
- the air resistance is less than 20 seconds, the lithium barrier property is lowered in lithium ion secondary battery applications, and the risk of short-circuiting due to lithium dendrite increases, which is not preferable for safety. If it exceeds 600 seconds, the volume resistivity is particularly large, and the output characteristics of the electrochemical device are deteriorated.
- the cellulose microporous membrane of the present invention has a volume resistivity measured by using an alternating current of 20 kHz in a state impregnated with a propylene carbonate solution of LiPF 6 having a concentration of 1 mol / L is 1500 ⁇ ⁇ cm or less. Is preferred. Volume resistivity correlates with the above-mentioned air permeability resistance and porosity. Basically, the air resistance is low, and the volume resistivity tends to decrease as the porosity increases. The rate is also affected by the size of the pores and the distribution of the pores in the membrane, so that a low air permeability resistance and a high porosity do not necessarily indicate a low volume resistivity.
- the purpose of using an alternating current with a frequency of 20 kHz is to remove electrochemical elements such as reaction at the electrode interface from the measured value of volume resistivity.
- the measured value can reflect the pore distribution and pore diameter of the cellulose microporous membrane.
- the volume resistivity of the cellulose microporous membrane of the present invention is preferably 1500 ⁇ ⁇ cm or less, and more preferably 1000 ⁇ ⁇ cm or less. If it exceeds 1500 ⁇ ⁇ cm, the cycle characteristics may be deteriorated. When it is 1500 ⁇ ⁇ cm or less, good cycle characteristics are exhibited and it can be suitably used as a separator for electrochemical devices.
- the volume resistivity measurement using an alternating current of 20 kHz in the present invention can be performed by the following procedure. First, the cellulose microporous membrane punched out to a diameter of 20 mm is dried at 150 ° C. for 24 hours or more. Next, five dried microporous membranes made of cellulose are placed on, for example, a sample holder for SH2-Z type solid (manufactured by Toyo Technica), and sufficient for an electrolyte solution of LiPF 6 / propylene carbonate having a concentration of 1 mol / L. Soak in.
- the air remaining between the microporous membranes made of cellulose is sandwiched between two opposing gold electrodes, and a frequency response analyzer VSP combining potentio / galvano studs
- the AC impedance value ( ⁇ ) is measured under the conditions of a sweep frequency of 100 m to 1 MHz and an amplitude of 10 mV using (Bio-Logic). This value and the thickness of the cellulose microporous membrane are converted into a resistivity per unit volume (volume resistivity). Note that it is desirable to measure only the resistance component of the measuring device or cancel it so that it is not reflected in the measurement result.
- the porosity of the cellulose microporous membrane of the present invention is preferably 30 to 70%.
- the cellulose microporous membrane of the present invention can cope with an electrochemical element by maintaining the porosity in the range of 30% to 70%. Although it is possible to operate as an electrochemical element even if the porosity is less than 30%, the resistance value is high, so the output is lowered and the performance as an electrochemical element may not be sufficient.
- the porosity exceeds 70%, the mode diameter of the pore distribution becomes large and the resistance caused by the microporous film is lowered, so that the output performance and cycle characteristics of the electrochemical device are improved, but the lithium ion secondary battery In use, the lithium barrier property is lowered, and the risk of short circuiting due to lithium dendrite is increased.
- the porosity in the present invention can be calculated from the weight of the solvent absorbed by impregnating a cellulose microporous membrane with a solvent that does not swell cellulose fibers. Specifically, a sample cut to a size of 50 mm ⁇ 50 mm is conditioned for one day in an atmosphere of 23 ° C. and 50% relative humidity, then the thickness of the sample is measured, and the weight of the sample is further measured by a 4-digit or 5-digit scale. Weigh using. After weighing, after impregnating with a solvent for 1 minute, excess solvent is absorbed on the surface with blotting paper and then weighed again.
- the volume of the solvent is determined by dividing the value obtained by subtracting the weight before impregnation from the weight after impregnation by the density of the impregnated solvent.
- the percentage of the total volume calculated from the thickness is taken as the porosity. Therefore, the porosity in this case can be obtained by the following equation.
- the solvent capable of measuring the porosity is a solvent that does not swell cellulose, and therefore, an organic solvent having a low polarity is preferably used.
- an organic solvent having a low polarity is preferably used.
- Particularly preferred are petroleum-based high-boiling solvents such as propylene glycol and kerosene that are usually used in electrolytic solutions.
- the surface roughness of the microporous membrane made of cellulose of the present invention is preferably an Ra value of 1.5 or less on both the front and back sides. It is known that the surface roughness affects the AC impedance as the contact resistance between the positive electrode and the separator when the electrochemical device is manufactured. This contact resistance can be calculated from the difference between a value of 0.1 Hz and an AC impedance value of 20000 Hz measured with an electrochemical element such as a laminate cell or coin battery. As the surface roughness Ra value increases, the difference between the value of 0.1 Hz and the value of 20000 Hz increases. The value of AC impedance is inversely proportional to the facing area according to Ohm's law.
- this value of a laminated cell having a facing area of 15 cm 2 made of a material used in a general lithium ion secondary battery such as LiPF 6 as a electrolyte using a CoLiO 2 positive electrode and a graphite negative electrode has an Ra value of 1.5. Is about 1 ⁇ .
- the contact resistance of the battery is preferably as low as possible, the condition where Ra is as small as possible is preferable.
- the surface roughness Ra varies depending on the fineness of the raw material, the dispersion state of the fibers, and the surface properties of the substrate.
- the base material transfer surface of the separator is more significantly affected than the influence of the fineness of the raw material and the dispersion state of the fibers, and therefore can be suitably used on the positive electrode side.
- the wire mesh is unsuitable because the transfer surface of the filter cloth comes out as it is, and the Ra value cannot be controlled small.
- the cellulose microporous membrane of the present invention is obtained from a slurry containing a hydrophilic pore-opening agent together with cellulose fibers containing 5% by weight or more of fibers having a thickness of 1 ⁇ m or more based on the total weight of the cellulose fibers. preferable.
- the cellulose microporous membrane of the present invention contains 5% by weight or more, preferably 30% by weight or less of fibers having a diameter of 1 ⁇ m or more with respect to the total weight of the cellulose fibers used.
- a step of applying a slurry containing essentially a hydrophilic pore-opening agent on a substrate, a step of drying the slurry to form a sheet on the substrate, and peeling the sheet from the substrate It can be obtained by a production method including at least a step of obtaining a cellulose microporous membrane comprising a sheet.
- the production efficiency can be greatly improved by applying a slurry containing a hydrophilic pore-opening agent onto a release substrate and drying as a means for making the sheet of cellulose fibers porous.
- the pore size of the sheet can be controlled by adjusting the solubility of the hydrophilic pore-opening agent in water.
- the porosity can be freely controlled by adjusting the amount of the hydrophilic pore-opening agent added.
- the hydrophilic pore-opening agent is preferably 50 to 600 parts by weight, more preferably 80 to 400 parts by weight, and still more preferably 100 to 300 parts by weight with respect to 100 parts by weight (mass) of cellulose fibers. Can be used in proportions.
- the hydrophilic pore-opening agent used in the present invention is not particularly limited as long as it is a hydrophilic substance capable of forming fine pores in a sheet made of cellulose fibers, but the boiling point of the hydrophilic pore-opening agent is It is preferable that it is 180 degreeC or more. It is known that hydrogen bonds between fibers are formed when the sheet moisture during drying is between 10 and 20% by weight. When this hydrogen bond is formed, a pore-opening agent is present in the sheet, and it becomes possible to make it porous by inhibiting the hydrogen bond between fibers. When a pore-opening agent having a boiling point of less than 180 ° C.
- a pore opening agent having a boiling point of 180 ° C. or higher is preferable, but 200 ° C. or higher is more preferable.
- a primary alcohol having a molecular weight lower than that of hexanol is a material having both water-solubility and hydrophobicity.
- hydrogen bonds cannot be sufficiently inhibited because it is more volatile than water in the drying process. Cannot be used.
- the boiling point is not necessarily obtained. Need not be 180 ° C. or higher.
- the hydrophilic pore-opening agent used in the present invention preferably has a water solubility of 20% by weight or more, more preferably 30% by weight or more.
- a pore-opening agent having a solubility in water of less than 20% by weight is used, so that the target porosity can be controlled only by the amount of pore-opening agent added. It can be difficult.
- separates because the amount of solvent decreases as drying progresses, it may become difficult to make it porous uniformly in the surface direction and the thickness direction of the sheet.
- Such a hydrophobic pore-opening agent can be made evenly porous to some extent by emulsifying with an emulsifier or the like, but it is difficult to control the pore size.
- a pore-opening agent having a solubility in water of 20% by weight or more it can be uniformly dispersed in the slurry, and since it is highly soluble in water, it is not separated in the drying step. In this case, the pores can be made uniform by uniformly inhibiting hydrogen bonding.
- the hydrophilic pore-opening agent used in the present invention preferably has a vapor pressure at 25 ° C. of less than 0.1 kPa, more preferably less than 0.09 kPa, and even more preferably less than 0.08 kPa. Since the hydrophilic pore-opening agent having a vapor pressure of 0.1 kPa or more has high volatility, it tends to volatilize before contributing to the porosity of the cellulose membrane, and as a result, it is difficult to obtain a microporous cellulose membrane. There is a risk.
- the hydrophilic pore-opening agent used in the present invention preferably has a water / octanol distribution coefficient (Log Pow) in the range of ⁇ 1.2 to 0.8, and in the range of ⁇ 1.1 to 0.8. More preferred are those in the range of -0.7 to 0.4.
- the octanol is preferably n-octanol.
- higher alcohols such as 1,5-pentanediol, 1-methylamino-2,3-propanediol, lactones such as iprosin caprolactone and ⁇ -acetyl- ⁇ -butyllactone, diethylene glycol, 1,3-butylene glycol
- Glycols such as propylene glycol, triethylene glycol dimethyl ether, tripropylene glycol dimethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol butyl methyl ether, tetraethylene glycol dimethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether , Triethylene glycol monobutyl ether, tetraethylene glycol monobutyl Ether, dipropylene glycol monomethyl ether, diethylene glycol monomethyl ether
- the slurry used in the present invention contains 3 to 80 parts by weight of a hydrophilic polymer binder as an adhesive for connecting the fibers in addition to the cellulose fibers and the hydrophilic pore opening agent, based on 100 parts by weight of the cellulose fibers. Is preferably contained in an amount of 5 to 50 parts by weight.
- the hydrophilic polymer binder can exhibit a function of improving the dispersibility of cellulose in addition to the function as an adhesive. In order to obtain a uniform pore distribution, it is necessary to disperse the fibers uniformly in the slurry. However, the hydrophilic polymer binder functions as a protective colloid by fixing on the surface of the cellulose fiber. Improves.
- the added amount of the binder is less than 3 parts by weight, the strength of the finished sheet may be reduced, and the dispersibility of the cellulose fibers is deteriorated, so that it is difficult to obtain uniform pores.
- the amount is more than 80 parts by weight, it is not preferable because the binder fills the pores and the volume resistivity of the microporous cellulose membrane increases.
- hydrophilic polymer binder examples include cellulose derivatives such as methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, and hydroxyalkylcellulose, and derivatives of polysaccharides such as phosphate esterified starch, cationized starch, and corn starch. It is possible to use a binder such as a styrene-butadiene copolymer emulsion or polyvinylidene fluoride known as a binder for electrodes.
- the substrate used in the present invention is not particularly limited, but a polymer film, a glass plate, a metal plate, a release paper, and the like can be used.
- the material of the base material is preferably one in which the hydrophilic pore-opening agent in the slurry such as wire, filter cloth, filter paper and the like does not come out.
- the porous pore opening agent is used to make a porous material, the sheet cannot be sufficiently porous if the hydrophilic pore opening agent comes off from the back of the substrate before drying.
- the dried sheet has the property of transferring the surface property of the substrate, it is preferable that the surface of the substrate is as smooth as possible.
- the biaxially stretched polyethylene terephthalate film is flexible and has a relatively high melting temperature, so that it is less affected by elongation and shrinkage during drying. Moreover, since polarity is high compared with a polypropylene film, it is easy to apply even in an aqueous slurry formulation, and can be suitably used.
- the method of applying a slurry containing cellulose fibers and a hydrophilic pore-opening agent onto the substrate may be a coating method that can be uniformly applied so that the thickness of the coating layer is within a certain range.
- Any means can be used.
- coating is possible with a pre-weighing type coater such as a slot die coater or a curtain coater, or a post-weighing type such as an MB coater, MB reverse coater or comma coater.
- a surfactant can be added to the slurry as an additive.
- a nonionic surfactant represented by acetylene glycol or the like as an antifoaming agent or a leveling agent can be used as long as it does not affect the performance of the electrochemical device. It is preferable not to use an ionic surfactant because it may affect electrochemical device performance.
- the slurry containing cellulose fibers and a hydrophilic pore-opening agent can contain a filler in addition to the binder and the surfactant.
- a filler in addition to the binder and the surfactant.
- inorganic fillers such as silica particles and alumina particles, and organic fillers such as silicone powder can be used. These particles can be added to such an extent that they do not affect the pores of the microporous membrane made of cellulose, but it is preferable to use particles having an average particle diameter of less than 2 ⁇ m as much as possible. An average particle size of 2 ⁇ m or more is not preferable because a pore having a large pore size is opened by a gap between particles.
- the slurry solvent used in the present invention basically needs to use water, but for the purpose of improving the drying efficiency, alcohols such as methanol, ethanol and t-butyl alcohol, ketones such as acetone and methyl ethyl ketone, It is possible to add a solvent having a higher vapor pressure than water, such as ethers such as diethyl ether and ethyl methyl ether, to 50% by weight of the total amount of the solvent. When these solvents are added in an amount of 50% by weight or more, the dispersibility of the cellulose fibers is deteriorated and the uniformity of the pore distribution is deteriorated, which is not preferable.
- the slurry applied on the substrate can be dried to obtain a sheet.
- the drying method is not particularly limited, specifically, it can be carried out using a commonly used drying method such as hot air drying and far infrared drying alone or in combination,
- the hot air temperature can be 30 to 150 ° C., preferably 60 to 120 ° C.
- the hot air temperature, the amount of hot air, far-infrared irradiation conditions, etc. so that the structure in the thickness direction of the sheet can be dried as uniformly as possible. Need to be adjusted. Microwave heating can also be used to improve drying efficiency.
- the sheet thickness in the present invention is preferably in the range of 10 to 40 ⁇ m.
- the thickness of the microporous membrane made of cellulose is a factor that can greatly change the performance of the electrochemical device, but if it is less than 10 ⁇ m, the lithium barrier property may not be sufficient and the safety may not be sufficient. On the other hand, if it exceeds 40 ⁇ m, the volume resistivity value of the microporous membrane made of cellulose becomes large, and the output performance of the electrochemical device is deteriorated.
- Particularly preferred is a sheet in the range of 15 to 30 ⁇ m in view of the balance between lithium barrier properties and volume resistivity values.
- the sheet formed on the base material in this way can be peeled to obtain a cellulose microporous film made of the sheet.
- the method for peeling the microporous film from the substrate is not particularly limited.
- the production method of the present invention includes at least a cellulose fiber and a hydrophilic pore-opening agent in which a fiber having a thickness of 1 ⁇ m or more is 5% by weight or more, preferably 30% by weight or less, based on the total weight of the cellulose fiber.
- a slurry to a substrate
- the sheet may be further washed with an organic solvent. This cleaning process is for removing components that impede the performance of the electrochemical element when a surfactant or the like is used as necessary, and for smoothly performing the process of peeling the sheet from the substrate. is there.
- the organic solvent is not particularly limited as long as it can be used in the washing step. However, in order to avoid the influence of sheet shrinkage due to the transfer of residual moisture into the organic solvent, the water solubility is low. Are preferred.
- organic solvent examples include organic solvents having a relatively high volatilization rate such as acetone, methyl ethyl ketone, ethyl acetate, n-hexane, toluene, and propanol.
- a solvent having a high affinity with water such as ethanol and methanol is preferable.
- the moisture in the sheet is transferred to the solvent or moisture in the air is absorbed, so that the cellulose In order to affect the physical properties and sheet shape of the microporous membrane, it is necessary to use it in a state where the water content is controlled.
- Solvents with high hydrophobicity such as n-hexane and toluene can be suitably used because they have a poor cleaning effect on the hydrophilic pore-opening agent but hardly absorb moisture.
- a method of replacing the solvent while repeating washing in the order of gradually increasing hydrophobicity such as acetone, toluene, and n-hexane is preferable.
- the cellulose microporous membrane of the present invention can be used as one component of an electrochemical element separator or as it is as an electrochemical element separator.
- the separator for an electrochemical element of the present invention can be used for, for example, a battery such as a lithium ion secondary battery or a polymer lithium battery, and a capacitor such as an aluminum electrolytic capacitor, an electric double layer capacitor, or a lithium ion capacitor.
- a battery such as a lithium ion secondary battery or a polymer lithium battery
- a capacitor such as an aluminum electrolytic capacitor, an electric double layer capacitor, or a lithium ion capacitor.
- the configuration of the electrochemical element can be the same as that of a conventional electrochemical element except that the electrochemical element separator of the present invention is used as a separator.
- the cell structure of the electrochemical element is not particularly limited, and examples thereof include a laminated type, a cylindrical type, a square type, and a coin type.
- a lithium ion secondary battery as an electrochemical element including the separator according to the present invention has a positive electrode and a negative electrode, and the electrochemical element separator according to the present invention is disposed between the positive electrode and the negative electrode. Is impregnated with an electrolytic solution.
- the positive electrode and the negative electrode include an electrode active material.
- the positive electrode active material conventionally known materials can be used, and examples thereof include lithium transition metal oxides such as LiCoO 2 , LiNiO 2 , and LiMn 2 O 4 , lithium metal phosphates such as LiFePO 4, and the like.
- a conventionally well-known thing can be used as a negative electrode active material, For example, carbon materials, such as a graphite, lithium alloys, etc. are mentioned.
- a conventionally well-known conductive support material and a binder are added to an electrode as needed.
- a positive electrode active material a negative electrode active material, and, if necessary, a positive electrode mixture and a negative electrode mixture each containing a conventionally known conductive additive and binder, respectively.
- a conventionally known current collector for example, aluminum or the like is used for the positive electrode, and copper or nickel is used for the negative electrode.
- the positive electrode and the negative electrode mixture are applied to the current collector, the positive electrode and the negative electrode in which the active material layer is formed on the current collector are obtained by drying and pressing.
- the obtained positive electrode and negative electrode and the separator for an electrochemical element of the present invention are laminated or wound in the order of a positive electrode, a separator for an electrochemical element, and a negative electrode to constitute an element.
- the element is housed in an exterior material, the current collector is connected to an external electrode, impregnated with a conventionally known electrolytic solution, and then the exterior material is sealed to obtain a lithium ion secondary battery.
- an electric double layer capacitor as an electrochemical element including the separator of the present invention has a positive electrode and a negative electrode, and the separator for an electrochemical element of the present invention is disposed between the positive electrode and the negative electrode.
- the separator is impregnated with an electrolytic solution.
- the positive electrode and the negative electrode are formed by, for example, applying an electrode mixture containing activated carbon powder and a conventionally known conductive additive or binder to a conventionally known current collector, drying, and press-molding. Is obtained.
- a conventionally known current collector for example, aluminum or the like is used as the current collector.
- An electric double layer capacitor comprises a positive electrode, a negative electrode, and a separator for an electrochemical device of the present invention, which are laminated or wound in the order of a positive electrode, a separator for an electrochemical device, and a negative electrode in order. Then, the element is housed in an exterior material, the current collector is connected to an external electrode, impregnated with a conventionally known electrolytic solution, and then the exterior material is sealed.
- the number average fiber length was measured with a fiber length measuring machine FIBER TESTER (manufactured by L & W).
- the sample was cut to a width of about 1 mm and the sample was cut to a width of about 1 mm, and then fixed to a sample holding jig and subjected to CT scan using TDM1000H-S ⁇ .
- the fiber amount was measured by extracting an arbitrary range of 27.89 ⁇ m ⁇ 448.70 ⁇ m ⁇ 432.26 ⁇ m at the center so as not to include the air portion at the outer periphery of the sample.
- (3) Measurement of thickness Using a thickness meter TM600 (manufactured by Kumagai Riki Co., Ltd.), the thickness of a cellulose microporous membrane 50 mm ⁇ 50 mm sample was arbitrarily measured at five points, and the average value was taken as the film thickness.
- (4) Measurement of tensile strength Tensile strength was measured by a measurement method according to JIS C2151.
- the AC impedance value ( ⁇ ) was measured under the conditions of a sweep frequency of 100 m to 1 MHz and an amplitude of 10 mV using a frequency response analyzer VSP (manufactured by Bio-Logic) that was sandwiched between gold electrodes and combined with a potentio / galvano stud.
- the measurement temperature was 25 ° C. This value and the thickness measured in (3) were converted to a resistivity (volume resistivity) value per unit volume.
- NBKP was dispersed in ion-exchanged water so as to have a concentration of 2% by weight, and beaten by cycling to a condition where the number average fiber length was 1.0 mm or less using a double risk refiner.
- the cellulose fiber dispersion having a number average fiber length of 1.0 mm or less was treated with a high-pressure homogenizer (manufactured by LAB-1000) 10 times under the condition of 800 bar to obtain a fine cellulose fiber raw material 1.
- the refined cellulose fiber raw material 2 was obtained by performing the treatment three times with a high-pressure homogenizer. Each was concentrated to about 10% by weight using a fiber centrifuge for 5 minutes at 10,000 rpm.
- the solid content of the cellulose fiber raw material 1 is 90% by weight
- the raw material mixed with the solid content of the cellulose fiber raw material 2 is 10% by weight
- 100 parts by weight Carboxymethylcellulose (trade name: trade name: 250 parts by weight of triethylene glycol butyl methyl ether having a boiling point of 261 ° C. as a hydrophilic pore-opening agent and infinite solubility in water and 1% by weight as a binder.
- MAC-500LC manufactured by Nippon Paper Chemicals Co., Ltd.
- the paint with water added so that the final solid content concentration was 1.5% by weight was added using 3 ⁇ m zirconia beads and using a bead mill. Dispersion was performed until evenly mixed.
- the prepared paint was applied on a 100 ⁇ m PET film using an applicator so that the WET film thickness was 1.0 mm, and dried for 12 minutes using hot air at 80 ° C. and an infrared heater.
- the obtained coating film was peeled from the PET film in toluene and the toluene was volatilized to obtain a sheet (cellulose microporous film) having a thickness of 20 ⁇ m.
- Example 2 A sheet having a film thickness of 20 ⁇ m was obtained in the same manner as in Example 1 except that the solid content of the cellulose fiber raw material 1 was 80 wt% and the solid content of the cellulose fiber raw material 2 was 20 wt%.
- Example 3 A sheet having a film thickness of 21 ⁇ m was obtained in the same manner as in Example 1 except that the solid content of the cellulose fiber raw material 1 was 50 wt% and the solid content of the cellulose fiber raw material 2 was 50 wt%.
- NBKP was dispersed in ion-exchanged water so as to have a concentration of 2%, and was beaten by cycling to a condition where the number average fiber length was 1.0 mm or less using a double risk refiner.
- a mass colloider manufactured by Masuko Sangyo Co., Ltd.
- Example 2 Thereafter, a sheet having a film thickness of 21 ⁇ m was obtained using the same method as in Example 1 except that the solid content of the cellulose fiber raw material 3 was 50 wt% and the solid content of the cellulose fiber raw material 2 was 50 wt%. .
- Example 1 A sheet having a film thickness of 23 ⁇ m was obtained in the same manner as in Example 1 except that the solid content of the cellulose fiber raw material 1 was 40 wt% and the solid content of the cellulose fiber raw material 2 was 60 wt%.
- NBKP was dispersed in ion-exchanged water so as to have a concentration of 2% by weight, and beaten by cycling to a condition where the number average fiber length was 1.0 mm or less using a double risk refiner.
- the cellulose fiber dispersion having a number average fiber length of 1.0 mm or less was treated with a high-pressure homogenizer (manufactured by LAB-1000) 15 times under the condition of 800 bar to obtain a fine cellulose fiber raw material 4. It concentrated to about 6 weight% by processing for 5 minutes on the conditions of 10,000 rpm using a fiber centrifuge.
- a cellulose microporous membrane was prepared in the same manner as in Example 1 except that the refined cellulose fiber raw material 4 was used, and a sheet having a thickness of 19 ⁇ m was obtained.
- Example 3 A sheet having a film thickness of 20 ⁇ m was obtained using the same method as in Example 1 except that the solid content of the cellulose fiber raw material 1 was 95 wt% and the solid content of the cellulose fiber raw material 2 was 5 wt%.
- Table 1 shows various physical properties of the cellulose sheets prepared in Examples 1 to 4 and Comparative Examples 1 to 3.
- Comparative Example 1 showed that when the content ratio of thick fibers having a fiber diameter of 1 ⁇ m or more exceeds a certain amount, the tensile strength is greatly reduced. Further, Comparative Examples 2 and 3 showed that when the content ratio of thick fibers having a fiber diameter of 1 ⁇ m or more is a certain amount or less, the tear strength is greatly reduced.
- Example 5 (Production of lithium ion secondary battery)
- a mixture obtained by mixing LiCoO 2 , acetylene black, and Pvdf-NMP solution (polyvinylidene fluoride-N-methylpyrrolidone) at a solid mass ratio of 89: 6: 5 was applied onto an aluminum foil and dried. It was manufactured by heat treatment after pressure molding.
- a mixture prepared by mixing mesocarbon microbead graphite, acetylene black and Pvdf-NMP solution at a solid mass ratio of 90: 5: 5 was applied onto a copper foil, dried, pressure-molded and then heated. Prepared by processing.
- the separator As the separator, the cellulose microporous membrane of Example 1 was used, and the electrode group was formed by interposing the separator between the negative electrode and the positive electrode.
- the volume ratio of ethylene carbonate / diethyl carbonate was 3: 7.
- a lithium ion secondary battery (cell size: 30 ⁇ 50 mm, battery capacity: 180 mAh) was prepared by loading a non-aqueous electrolyte solution in which 1 mol / L LiPF 6 was dissolved in the solvent mixed in step 1 into an aluminum pack. .
- Example 5 Evaluation of lithium ion secondary battery
- the internal resistance of the battery was evaluated by measuring AC impedance.
- the value of the part was read and used as the internal resistance ( ⁇ ).
- the internal resistance was 0.125 ⁇ .
- Example 6 (Production of electric double layer capacitor) A mixture prepared by mixing a mixture of activated carbon, acetylene black and tetrafluoroethylene at a mass ratio of solid content of 10: 1: 1 was applied onto an aluminum foil, dried, pressure-molded, and then heat-treated to produce an electrode. .
- the separator As the separator, the cellulose microporous membrane of Example 1 was used, and the separator was cut into a size about 0.5 mm larger than the electrode.
- the electrode has an opposing area of 15 cm 2 , a separator is interposed between the two electrodes, a 1 mol / L tetraethylammonium BF 4 salt (organic electrolyte) propylene carbonate solution is filled, and the electric double layer capacitor is Produced.
- Example 6 The performance of the electric double layer capacitor produced in Example 6 was evaluated.
- the internal resistance of the battery was evaluated by measuring AC impedance. A real number in which a Cole-Cole plot is created from the measured values of AC impedance ( ⁇ ) measured using a frequency response analyzer 1260 type (manufactured by Solartron) under conditions of a sweep frequency of 10 m to 500 kHz and an amplitude of 5 mV. The value of the part was read and used as the internal resistance ( ⁇ ). The internal resistance was 0.058 ⁇ .
- Examples 5 and 6 show that the battery and the capacitor provided with the cellulose microporous membrane of the present invention have a low internal resistance and can be suitably used as the battery and the capacitor.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cell Separators (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
1)電解液に対して化学的に安定であり、セパレータにより致命的な欠陥を起こさない。
2)セパレータの厚みを自由に設計することができるため、様々な要求に対応したセパレータの提供が可能である。
3)細孔径のサイズを小さく設計することができるため、リチウム遮断特性が優れ、リチウムデンドライトによる短絡が発生し難い。
4)リチウムイオン二次電池が熱暴走を起こした際に、ポリプロピレンやポリエチレンが溶融することで細孔が狭くなり初期の熱暴走を抑制することが可能である。
といった点である。
前記セルロース繊維に1μm以上の太さの繊維がセルロース繊維の全重量を基準として5重量%以上含まれており、
引張強度が50N・m/g以上であり、及び/又は、引裂強度が0.40kN/m以上である、
微多孔膜に関する。
1μm以上の太さの繊維がセルロース繊維の全重量を基準として5重量%以上含まれているセルロース繊維及び親水性開孔剤を少なくとも含むスラリーを基材上に塗布する工程、
前記スラリーを乾燥させて前記基材上にシートを形成する工程、及び、
前記シートを前記基材から剥離して該シートからなるセルロース微多孔膜を得る工程
を備える上記微多孔膜の製造方法にも関する。
前記セルロース繊維に1μm以上の太さの繊維がセルロース繊維の全体積を基準として5重量%以上含まれており、
引張強度が50N・m/g以上であり、及び/又は、引裂強度が0.40kN/m以上である。
繊維長測定機FIBER TESTER(L&W社製)にて、数平均繊維長を測定した。
(2)1μm以上の太さの繊維が含まれる割合の測定
X線CT解析装置を使用し、その回折データを1μm以上の太さを観察できる閾値に設定して、繊維部分を抽出し全体量に含まれる割合から計算繊維量を計算する方法を採用した。試料を約1mm幅にカットし試料は約1mm幅にカットした後、試料保持治具に固定してTDM1000H-Sμを用いてCTスキャンした。繊維量の計測は、試料外周部の空気部分を含まないようにするため、中心部の任意の27.89μm×448.70μm×432.26μmの範囲を抽出して実施した。
(3)厚さの測定
厚み計TM600(熊谷理機製)を用い、セルロース製微多孔膜50mm×50mmのサンプルの厚さを任意で5点測定し、その平均値を膜厚とした。
(4)引張強度の測定
JIS C2151に準じた測定法により引張強度を測定した。
(5)引裂強度の測定
JIS K7128-1に準じたトラウザー引裂法により測定した。
(6)20kHzの交流インピーダンスの測定及び体積抵抗率の決定
インピーダンス測定用のセルとしてSH2-Z型固体用サンプルホルダ(東陽テクニカ製)を使用した。直径20mmのサイズに打ち抜いたセパレータを150℃の条件で24時間以上乾燥させた。乾燥したセパレータを5枚重ねて1mol/LのLiPF6/プロピレンカーボネートの電解液に十分に浸したのち、0.8MPaまで減圧してセパレータ間に残る空気を脱気した後、対向する2枚の金電極間に挟み、ポテンショ/ガルバノスタッドを組み合わせた周波数応答アナライザVSP(Bio-Logic製)を用いて掃引周波数100m~1MHz、振幅10mVの条件で交流インピーダンス値(Ω)を測定した。なお、測定温度は25℃とした。この値と(3)で測定した厚みから単位体積当たりの抵抗率(体積抵抗率)値に換算した。
(7)空孔率の測定
50mm×50mmのサイズにカットしたサンプルを23℃50%RHの雰囲気下で1日調湿した後、サンプルの厚みを測定し、更にサンプルの重量を4桁若しくは5桁秤を用いて秤量する。秤量後、ケロシンに1分間含浸させた後、表面について余分な溶媒を吸い取り紙で吸収した後、再度秤量を行い、前述の計算式より算出した。
NBKPをイオン交換水中に2重量%濃度になるように分散させ、ダブルリスクリファイナーを用いて数平均繊維長1.0mm以下となるような条件までサイクリングにて叩解した。数平均繊維長が1.0mm以下となったセルロース繊維分散液を高圧ホモジナイザー(LAB-1000製)で800barの条件で10回処理することにより微細化セルロース繊維原料1を得た。同様の手法を用いて、高圧ホモジナイザーで3回処理することにより微細化セルロース繊維原料2を得た。それぞれ、繊維遠心分離装置を用いて10000rpmの条件で5分処理することにより約10重量%まで濃縮した。
セルロース繊維原料1の固形分を80重量%、セルロース繊維原料2の固形分を20重量%にした以外は、実施例1と同様の手法を用いて、膜厚が20μmのシートを得た。
セルロース繊維原料1の固形分を50重量%、セルロース繊維原料2の固形分を50重量%にした以外は、実施例1と同様の手法を用いて、膜厚が21μmのシートを得た。
NBKPをイオン交換水中に2%濃度になるように分散させ、ダブルリスクリファイナーを用いて数平均繊維長1.0mm以下となるような条件までサイクリングにて叩解した。数平均繊維長が1.0mm以下となったセルロース繊維分散液をマスコロイダー(増幸産業株式会社製)で3回処理することにより、微細化セルロース繊維原料3を得た。以後、セルロース繊維原料3の固形分を50重量%、セルロース繊維原料2の固形分を50重量%にした以外は、実施例1と同様の手法を用いて、膜厚が21μmのシートを得た。
セルロース繊維原料1の固形分を40重量%、セルロース繊維原料2の固形分を60重量%にした以外は、実施例1と同様の手法を用いて、膜厚が23μmのシートを得た。
NBKPをイオン交換水中に2重量%濃度になるように分散させ、ダブルリスクリファイナーを用いて数平均繊維長1.0mm以下となるような条件までサイクリングにて叩解した。数平均繊維長が1.0mm以下となったセルロース繊維分散液を高圧ホモジナイザー(LAB-1000 製)で800barの条件で15回処理することにより微細化セルロース繊維原料4を得た。繊維遠心分離装置を用いて10000rpmの条件で5分処理することにより約6重量%まで濃縮した。微細化セルロース繊維原料4を用いた以外は、実施例1と同様の手法でセルロース製微多孔膜を作成し、膜厚が19μmのシートを得た。
セルロース繊維原料1の固形分を95重量%、セルロース繊維原料2の固形分を5重量%にした以外は、実施例1と同様の手法を用いて、膜厚が20μmのシートを得た。
(リチウムイオン二次電池の作製)
正極は、LiCoO2、アセチレンブラック及びPvdf-NMP溶液(ポリフッ化ビニリデン-N-メチルピロリドン)を固形分の質量比89:6:5で混合した合剤を、アルミニウム箔上に塗布・乾燥し、加圧成型した後に加熱処理して作製した。負極は、メソカーボンマイクロビーズ黒鉛、アセチレンブラック及びPvdf-NMP溶液を、固形分の質量比90:5:5で混合した合剤を、銅箔上に塗布・乾燥し、加圧成型した後に加熱処理して作製した。
実施例5で作製したリチウムイオン二次電池について、電池の内部抵抗を交流インピーダンスの測定で評価した。周波数応答アナライザ1260型(ソーラトロン製)を用いて掃引周波数10m~500kHz、振幅5mVの条件で交流インピーダンス(Ω)を測定した測定値からコール・コールプロットを作成し虚数部の値が0となる実数部の値を読み取り内部抵抗(Ω)とした。内部抵抗は0.125Ωとなった。
(電気二重層キャパシタの作製)
活性炭、アセチレンブラック及びテトラフルオロエチレンの混合物を固形分の質量比10:1:1で混合した合剤を、アルミニウム箔上に塗布・乾燥し、加圧成型した後に加熱処理して電極を作製した。
実施例6で作製した電気二重層キャパシタの性能を評価した。電池の内部抵抗を交流インピーダンスの測定で評価した。周波数応答アナライザ1260型(ソーラトロン製)を用いて掃引周波数10m~500kHz、振幅5mVの条件で交流インピーダンス(Ω)を測定した測定値からコール・コールプロットを作成し虚数部の値が0となる実数部の値を読み取り内部抵抗(Ω)とした。内部抵抗は0.058Ωとなった。
Claims (15)
- セルロース繊維からなる微多孔膜であって、
前記セルロース繊維に1μm以上の太さの繊維がセルロース繊維の全重量を基準として5重量%以上含まれており、
引張強度が50N・m/g以上であり、及び/又は、引裂強度が0.40kN/m以上である、
微多孔膜。 - 空孔率が30~70%である、請求項1記載の微多孔膜。
- 前記セルロース繊維に1μm以上の太さの繊維がセルロース繊維の全重量を基準として5重量%以上30重量%以下の範囲で含まれている、請求項1又は2記載の微多孔膜。
- 前記セルロース繊維と共に親水性開孔剤を含むスラリーから得られる、請求項1~3のいずれかに記載の微多孔膜。
- 前記親水性開孔剤の水への溶解度が10重量%以上である、請求項4記載の微多孔膜。
- 前記親水性開孔剤がグリコールエーテル類である、請求項4又は5記載の微多孔膜。
- 前記スラリーがセルロース繊維100重量部に対して3~80重量部の割合で親水性高分子バインダーを含む、請求項4~6のいずれかに記載の微多孔膜。
- 1mol/LiPF6/プロピレンカーボネート溶液を含浸させた状態において20kHzの交流を使用して決定した体積抵抗率が1500Ω・cm以下である、請求項1~7のいずれかに記載の微多孔膜。
- 請求項1~8のいずれかに記載の微多孔膜を備える電気化学素子用セパレータ。
- 請求項9記載の電気化学素子用セパレータを備える電気化学素子。
- 電池又はキャパシタである請求項10記載の電気化学素子。
- 1μm以上の太さの繊維がセルロース繊維の全重量を基準として5重量%以上含まれているセルロース繊維及び親水性開孔剤を少なくとも含むスラリーを基材上に塗布する工程、
前記スラリーを乾燥させて前記基材上にシートを形成する工程、及び、
前記シートを前記基材から剥離して該シートからなるセルロース微多孔膜を得る工程
を備える請求項1~8のいずれかに記載の微多孔膜の製造方法。 - 前記シート又は微多孔膜を有機溶媒で洗浄する工程を更に備える、請求項12記載のセルロース微多孔膜の製造方法。
- 前記セルロース繊維が、粒度16~120番の砥粒を備える砥粒板を複数枚擦合せ配置した砥粒板擦合装置の擦合せ部に予め叩解処理したパルプスラリーを通過させる微細化処理を受けている、請求項12又は13記載の微多孔膜の製造方法。
- 前記セルロース繊維が、予め叩解処理したパルプスラリーを高圧ホモジナイザー処理する微細化処理を受けている、請求項13又は14記載の微多孔膜の製造方法。
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280006246.9A CN103842418B (zh) | 2011-10-13 | 2012-10-12 | 微多孔膜及其制造方法 |
US13/978,342 US8735000B2 (en) | 2011-10-13 | 2012-10-12 | Porous membrane and process for preparing the same |
EP12839853.4A EP2647662B1 (en) | 2011-10-13 | 2012-10-12 | Microporous membrane |
KR1020137019302A KR101446949B1 (ko) | 2011-10-13 | 2012-10-12 | 미다공막 및 그 제조 방법 |
ES12839853.4T ES2677471T3 (es) | 2011-10-13 | 2012-10-12 | Membrana microporosa |
RU2013134484/05A RU2542267C1 (ru) | 2011-10-13 | 2012-10-12 | Пористая мембрана и способ ее получения |
JP2013528425A JP5461745B2 (ja) | 2011-10-13 | 2012-10-12 | 微多孔膜及びその製造方法 |
MX2013007712A MX2013007712A (es) | 2011-10-13 | 2012-10-12 | Membrana porosa y procedimiento para preparacion de la misma. |
CA2824632A CA2824632A1 (en) | 2011-10-13 | 2012-10-12 | Porous membrane and process for preparing the same |
BR112013018606A BR112013018606A2 (pt) | 2011-10-13 | 2012-10-12 | membrana porosa, separador para um dispositivo eletroquímico, dispositivo eletroquímico, e, processo para preparar a membrana porosa |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011226269 | 2011-10-13 | ||
JP2011-226269 | 2011-10-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013054884A1 true WO2013054884A1 (ja) | 2013-04-18 |
Family
ID=48081930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/076447 WO2013054884A1 (ja) | 2011-10-13 | 2012-10-12 | 微多孔膜及びその製造方法 |
Country Status (12)
Country | Link |
---|---|
US (1) | US8735000B2 (ja) |
EP (1) | EP2647662B1 (ja) |
JP (1) | JP5461745B2 (ja) |
KR (1) | KR101446949B1 (ja) |
CN (1) | CN103842418B (ja) |
BR (1) | BR112013018606A2 (ja) |
CA (1) | CA2824632A1 (ja) |
ES (1) | ES2677471T3 (ja) |
MX (1) | MX2013007712A (ja) |
RU (1) | RU2542267C1 (ja) |
TW (1) | TW201332194A (ja) |
WO (1) | WO2013054884A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015191871A (ja) * | 2014-03-28 | 2015-11-02 | 特種東海製紙株式会社 | 膜電極複合体及びその製造方法、並びに、電気化学素子 |
KR101685878B1 (ko) | 2015-11-30 | 2016-12-12 | 스미또모 가가꾸 가부시키가이샤 | 비수 전해액 이차 전지용 세퍼레이터 |
RU2668078C2 (ru) * | 2013-06-24 | 2018-09-26 | Джонс Мэнвилл | Мат из сочетания грубых стекловолокон и микростекловолокон, используемый в качестве сепаратора в свинцово-кислотной аккумуляторной батарее |
KR20190062536A (ko) | 2016-10-24 | 2019-06-05 | 스미또모 가가꾸 가부시키가이샤 | 세퍼레이터 및 세퍼레이터를 포함하는 이차 전지 |
KR20190062535A (ko) | 2016-10-24 | 2019-06-05 | 스미또모 가가꾸 가부시키가이샤 | 세퍼레이터 및 세퍼레이터를 포함하는 이차 전지 |
US10573867B2 (en) | 2015-11-30 | 2020-02-25 | Sumitomo Chemical Company, Limited | Method for producing nonaqueous electrolyte secondary battery separator |
JP7402114B2 (ja) | 2020-05-18 | 2023-12-20 | 日本ポリプロ株式会社 | 繊維複合材料の品質管理方法および繊維複合材料の製造方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104681311B (zh) * | 2014-12-12 | 2017-12-19 | 宁波中车新能源科技有限公司 | 一种锂离子电容器的新型预嵌锂方法 |
CN104701031B (zh) * | 2014-12-12 | 2018-01-09 | 宁波中车新能源科技有限公司 | 一种锂离子电容器的制作方法及锂离子电容器 |
KR20170068304A (ko) | 2015-12-09 | 2017-06-19 | 삼성전자주식회사 | 대장균 및 코마가타에이박터 속 세포에서 복제가능한 벡터, 그를 포함한 세포, 및 그를 이용하는 방법 |
RU2650670C1 (ru) * | 2016-10-18 | 2018-04-16 | Федеральное государственное бюджетное учреждение науки Институт высокомолекулярных соединений Российской академии наук | Мембрана для нанофильтрации в водных, спиртовых и водно-спиртовых средах |
CN109004149B (zh) * | 2017-06-07 | 2021-08-10 | 银隆新能源股份有限公司 | 一种锂离子电池隔膜制作方法 |
CN116023705B (zh) * | 2023-03-22 | 2023-07-18 | 之江实验室 | 透明压电薄膜、超声换能器及其制备方法 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6261269A (ja) * | 1985-09-12 | 1987-03-17 | Fukui Kagaku Kogyo Kk | アルカリ電池用セパレ−タ− |
JPH1140130A (ja) | 1997-07-18 | 1999-02-12 | Oji Paper Co Ltd | 二次電池用セパレータ |
JP2000331663A (ja) * | 1999-05-18 | 2000-11-30 | Nippon Kodoshi Corp | セパレータ及び該セパレータを使用した電解コンデンサ,電気二重層コンデンサ,非水系電池 |
JP2006193858A (ja) * | 2005-01-13 | 2006-07-27 | Asahi Kasei Corp | 微多孔性セルロースシート及びその製造方法 |
JP4201308B2 (ja) | 2001-10-11 | 2008-12-24 | 株式会社豊田中央研究所 | リチウム二次電池用セパレータおよびそれを用いたリチウム二次電池 |
JP4425576B2 (ja) | 2003-06-23 | 2010-03-03 | 日本バイリーン株式会社 | リチウム二次電池用セパレータ及びリチウム二次電池 |
JP2010090486A (ja) | 2008-10-03 | 2010-04-22 | Asahi Kasei Corp | セルロース不織布およびその製造方法 |
JP2010235802A (ja) * | 2009-03-31 | 2010-10-21 | Agri Bioindustry:Kk | 導電性材料用支持体 |
JP4628764B2 (ja) | 2004-07-06 | 2011-02-09 | 旭化成株式会社 | 蓄電デバイス用セパレータ |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4594287A (en) * | 1981-09-25 | 1986-06-10 | Union Oil Company Of California | Densified carbonaceous bodies with improved surface finishes |
SU1706674A1 (ru) * | 1989-07-24 | 1992-01-23 | Институт коллоидной химии и химии воды им.А.В.Думанского | Способ получени композиционных мембран |
SE9002017D0 (sv) * | 1990-06-06 | 1990-06-06 | Kabivitrum Ab | Process for manufacture of matrices |
US5709798A (en) | 1995-06-19 | 1998-01-20 | Pall Corporation | Fibrous nonwoven web |
JP3980113B2 (ja) | 1997-03-11 | 2007-09-26 | ニッポン高度紙工業株式会社 | 電気二重層コンデンサ |
US5942354A (en) | 1997-12-02 | 1999-08-24 | Viskase Corporation | Reduced curl battery separator and method |
JP2000073265A (ja) | 1998-06-17 | 2000-03-07 | Mitsubishi Rayon Co Ltd | 吸水性及び蒸発性を有する繊維構造体 |
US6929884B2 (en) | 2001-04-19 | 2005-08-16 | Zinc Matrix Power, Inc. | Method for manufacture of films containing insoluble solids embedded in cellulose-based films |
JP2003331663A (ja) * | 2002-05-10 | 2003-11-21 | Sumitomo Wiring Syst Ltd | ワイヤハーネスの製造装置 |
JP2004146346A (ja) | 2002-08-28 | 2004-05-20 | Nisshinbo Ind Inc | 非水電解質および非水電解質二次電池 |
KR20050006540A (ko) * | 2003-07-09 | 2005-01-17 | 한국과학기술연구원 | 초극세 섬유상 다공성 고분자 분리막을 포함하는리튬이차전지 및 그 제조방법 |
CN100559526C (zh) | 2004-04-16 | 2009-11-11 | 三菱制纸株式会社 | 电化学元件用隔膜 |
JP4753874B2 (ja) * | 2004-07-01 | 2011-08-24 | 旭化成株式会社 | セルロース不織布 |
KR20070058660A (ko) | 2004-09-27 | 2007-06-08 | 가부시키가이샤 구라레 | 바인더 섬유 및 이것을 이용한 알칼리 전지용 세퍼레이터 |
JP5023261B2 (ja) | 2005-09-08 | 2012-09-12 | フジコピアン株式会社 | リチウム二次電池用セパレータおよびそれを用いたリチウム二次電池 |
US7170739B1 (en) * | 2005-09-30 | 2007-01-30 | E.I. Du Pont De Nemours And Company | Electrochemical double layer capacitors including improved nanofiber separators |
KR101389780B1 (ko) * | 2005-11-01 | 2014-04-29 | 도레이 배터리 세퍼레이터 필름 주식회사 | 폴리올레핀 미세 다공막 및 이를 이용한 전지용 세퍼레이터및 전지 |
JP2008274525A (ja) | 2007-04-06 | 2008-11-13 | Asahi Kasei Corp | 低目付セルロース不織布 |
JP4445537B2 (ja) | 2007-09-26 | 2010-04-07 | 株式会社東芝 | 二次電池、電池パック及び車 |
WO2009081881A1 (ja) * | 2007-12-21 | 2009-07-02 | Mitsubishi Chemical Corporation | 繊維複合体 |
JP4938640B2 (ja) | 2007-12-27 | 2012-05-23 | 旭化成せんい株式会社 | セパレーター |
JP2009224100A (ja) | 2008-03-14 | 2009-10-01 | Toray Ind Inc | 電池用セパレーター |
GB2462022B (en) * | 2008-06-16 | 2011-05-25 | Biovascular Inc | Controlled release compositions of agents that reduce circulating levels of platelets and methods thereof |
JP2010202987A (ja) | 2009-02-27 | 2010-09-16 | Asahi Kasei Corp | 複合シート材料及びその製法 |
EP2432933A4 (en) | 2009-05-18 | 2013-07-31 | Swetree Technologies Ab | PROCESS FOR PRODUCTION AND USE OF MICROFIBRILLED PAPER |
JP5474622B2 (ja) * | 2010-03-24 | 2014-04-16 | 富士重工業株式会社 | 蓄電デバイス |
EP2553747A2 (en) | 2010-04-02 | 2013-02-06 | Boston-Power, Inc. | Battery pack safety techniques |
KR101040572B1 (ko) | 2010-10-11 | 2011-06-16 | 대한민국 | 셀룰로오스 나노섬유를 이용한 다공성 분리막 및 그 제조방법 |
US9666848B2 (en) | 2011-05-20 | 2017-05-30 | Dreamweaver International, Inc. | Single-layer lithium ion battery separator |
-
2012
- 2012-10-12 EP EP12839853.4A patent/EP2647662B1/en active Active
- 2012-10-12 CA CA2824632A patent/CA2824632A1/en not_active Abandoned
- 2012-10-12 WO PCT/JP2012/076447 patent/WO2013054884A1/ja active Application Filing
- 2012-10-12 KR KR1020137019302A patent/KR101446949B1/ko active IP Right Grant
- 2012-10-12 TW TW101137690A patent/TW201332194A/zh unknown
- 2012-10-12 ES ES12839853.4T patent/ES2677471T3/es active Active
- 2012-10-12 RU RU2013134484/05A patent/RU2542267C1/ru not_active IP Right Cessation
- 2012-10-12 MX MX2013007712A patent/MX2013007712A/es not_active Application Discontinuation
- 2012-10-12 JP JP2013528425A patent/JP5461745B2/ja active Active
- 2012-10-12 BR BR112013018606A patent/BR112013018606A2/pt not_active IP Right Cessation
- 2012-10-12 CN CN201280006246.9A patent/CN103842418B/zh active Active
- 2012-10-12 US US13/978,342 patent/US8735000B2/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6261269A (ja) * | 1985-09-12 | 1987-03-17 | Fukui Kagaku Kogyo Kk | アルカリ電池用セパレ−タ− |
JPH1140130A (ja) | 1997-07-18 | 1999-02-12 | Oji Paper Co Ltd | 二次電池用セパレータ |
JP2000331663A (ja) * | 1999-05-18 | 2000-11-30 | Nippon Kodoshi Corp | セパレータ及び該セパレータを使用した電解コンデンサ,電気二重層コンデンサ,非水系電池 |
JP4201308B2 (ja) | 2001-10-11 | 2008-12-24 | 株式会社豊田中央研究所 | リチウム二次電池用セパレータおよびそれを用いたリチウム二次電池 |
JP4425576B2 (ja) | 2003-06-23 | 2010-03-03 | 日本バイリーン株式会社 | リチウム二次電池用セパレータ及びリチウム二次電池 |
JP4628764B2 (ja) | 2004-07-06 | 2011-02-09 | 旭化成株式会社 | 蓄電デバイス用セパレータ |
JP2006193858A (ja) * | 2005-01-13 | 2006-07-27 | Asahi Kasei Corp | 微多孔性セルロースシート及びその製造方法 |
JP2010090486A (ja) | 2008-10-03 | 2010-04-22 | Asahi Kasei Corp | セルロース不織布およびその製造方法 |
JP2010235802A (ja) * | 2009-03-31 | 2010-10-21 | Agri Bioindustry:Kk | 導電性材料用支持体 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2647662A4 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2668078C2 (ru) * | 2013-06-24 | 2018-09-26 | Джонс Мэнвилл | Мат из сочетания грубых стекловолокон и микростекловолокон, используемый в качестве сепаратора в свинцово-кислотной аккумуляторной батарее |
JP2015191871A (ja) * | 2014-03-28 | 2015-11-02 | 特種東海製紙株式会社 | 膜電極複合体及びその製造方法、並びに、電気化学素子 |
KR101685878B1 (ko) | 2015-11-30 | 2016-12-12 | 스미또모 가가꾸 가부시키가이샤 | 비수 전해액 이차 전지용 세퍼레이터 |
US10573867B2 (en) | 2015-11-30 | 2020-02-25 | Sumitomo Chemical Company, Limited | Method for producing nonaqueous electrolyte secondary battery separator |
KR20190062536A (ko) | 2016-10-24 | 2019-06-05 | 스미또모 가가꾸 가부시키가이샤 | 세퍼레이터 및 세퍼레이터를 포함하는 이차 전지 |
KR20190062535A (ko) | 2016-10-24 | 2019-06-05 | 스미또모 가가꾸 가부시키가이샤 | 세퍼레이터 및 세퍼레이터를 포함하는 이차 전지 |
JP7402114B2 (ja) | 2020-05-18 | 2023-12-20 | 日本ポリプロ株式会社 | 繊維複合材料の品質管理方法および繊維複合材料の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP2647662B1 (en) | 2018-04-25 |
KR101446949B1 (ko) | 2014-10-06 |
CN103842418B (zh) | 2015-10-07 |
RU2013134484A (ru) | 2015-01-27 |
CN103842418A (zh) | 2014-06-04 |
RU2542267C1 (ru) | 2015-02-20 |
TW201332194A (zh) | 2013-08-01 |
US20130280615A1 (en) | 2013-10-24 |
JP5461745B2 (ja) | 2014-04-02 |
EP2647662A1 (en) | 2013-10-09 |
US8735000B2 (en) | 2014-05-27 |
KR20130088901A (ko) | 2013-08-08 |
BR112013018606A2 (pt) | 2016-10-18 |
EP2647662A4 (en) | 2013-10-09 |
CA2824632A1 (en) | 2013-04-18 |
ES2677471T3 (es) | 2018-08-02 |
MX2013007712A (es) | 2013-09-26 |
JPWO2013054884A1 (ja) | 2015-03-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5461745B2 (ja) | 微多孔膜及びその製造方法 | |
JP5445885B2 (ja) | 電気化学素子用セパレータ及びその製造方法 | |
JP5461744B2 (ja) | 微多孔膜及びその製造方法 | |
JP5577561B2 (ja) | 微多孔膜及びその製造方法 | |
JP2014198835A (ja) | セルロース微多孔膜及びその製造方法、並びに、電気化学素子 | |
JP5448227B2 (ja) | 微多孔膜及びその製造方法 | |
JP6311904B2 (ja) | 微多孔膜及びその製造方法、並びに、電気化学素子 | |
JP2014211993A (ja) | 電気化学素子用セパレータ及びその製造方法、並びに、電気化学素子 | |
JP2016182817A (ja) | 積層体 | |
JP2017135043A (ja) | セルロース微多孔膜及びその製造方法、並びに、電気化学素子 | |
JP2016182816A (ja) | 積層体及びその製造方法 | |
JP6150045B2 (ja) | 微多孔膜及びその製造方法、並びに、電気化学素子 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12839853 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2013528425 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/A/2013/007712 Country of ref document: MX |
|
ENP | Entry into the national phase |
Ref document number: 2824632 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012839853 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13978342 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20137019302 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2013134484 Country of ref document: RU Kind code of ref document: A |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112013018606 Country of ref document: BR |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 112013018606 Country of ref document: BR Kind code of ref document: A2 Effective date: 20130719 |