JP5476844B2 - Porous film, battery separator and battery - Google Patents
Porous film, battery separator and battery Download PDFInfo
- Publication number
- JP5476844B2 JP5476844B2 JP2009183164A JP2009183164A JP5476844B2 JP 5476844 B2 JP5476844 B2 JP 5476844B2 JP 2009183164 A JP2009183164 A JP 2009183164A JP 2009183164 A JP2009183164 A JP 2009183164A JP 5476844 B2 JP5476844 B2 JP 5476844B2
- Authority
- JP
- Japan
- Prior art keywords
- porous film
- heat
- molecular weight
- weight
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229920000098 polyolefin Polymers 0.000 claims description 51
- 239000011342 resin composition Substances 0.000 claims description 32
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000010408 film Substances 0.000 description 105
- 239000010410 layer Substances 0.000 description 39
- 229920003235 aromatic polyamide Polymers 0.000 description 27
- 239000001993 wax Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 24
- 239000000945 filler Substances 0.000 description 19
- 229920006015 heat resistant resin Polymers 0.000 description 19
- 239000011248 coating agent Substances 0.000 description 18
- 238000000576 coating method Methods 0.000 description 18
- -1 ethylene, propylene, 1-butene Chemical class 0.000 description 17
- 239000000243 solution Substances 0.000 description 17
- 239000010419 fine particle Substances 0.000 description 15
- 239000002904 solvent Substances 0.000 description 15
- 229910052744 lithium Inorganic materials 0.000 description 13
- 239000000843 powder Substances 0.000 description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 12
- 239000004760 aramid Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000004642 Polyimide Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 229920001721 polyimide Polymers 0.000 description 8
- 125000003118 aryl group Chemical group 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 7
- 239000000155 melt Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 229910021383 artificial graphite Inorganic materials 0.000 description 5
- 239000003575 carbonaceous material Substances 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000000113 differential scanning calorimetry Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- MHSKRLJMQQNJNC-UHFFFAOYSA-N terephthalamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C=C1 MHSKRLJMQQNJNC-UHFFFAOYSA-N 0.000 description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 150000005676 cyclic carbonates Chemical class 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 229910003002 lithium salt Inorganic materials 0.000 description 4
- 239000012046 mixed solvent Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229910021382 natural graphite Inorganic materials 0.000 description 4
- 239000011255 nonaqueous electrolyte Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 4
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 150000004985 diamines Chemical class 0.000 description 3
- 230000010220 ion permeability Effects 0.000 description 3
- 159000000002 lithium salts Chemical class 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003495 polar organic solvent Substances 0.000 description 3
- 238000012643 polycondensation polymerization Methods 0.000 description 3
- 238000001175 rotational moulding Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 2
- 229910013063 LiBF 4 Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 229910012513 LiSbF 6 Inorganic materials 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 150000004984 aromatic diamines Chemical class 0.000 description 2
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 239000007770 graphite material Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- ZYAMKYAPIQPWQR-UHFFFAOYSA-N 1,1,1,2,2-pentafluoro-3-methoxypropane Chemical compound COCC(F)(F)C(F)(F)F ZYAMKYAPIQPWQR-UHFFFAOYSA-N 0.000 description 1
- AVQQQNCBBIEMEU-UHFFFAOYSA-N 1,1,3,3-tetramethylurea Chemical compound CN(C)C(=O)N(C)C AVQQQNCBBIEMEU-UHFFFAOYSA-N 0.000 description 1
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- UUAMLBIYJDPGFU-UHFFFAOYSA-N 1,3-dimethoxypropane Chemical compound COCCCOC UUAMLBIYJDPGFU-UHFFFAOYSA-N 0.000 description 1
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 description 1
- HIXDQWDOVZUNNA-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-5-hydroxy-7-methoxychromen-4-one Chemical compound C=1C(OC)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(OC)C(OC)=C1 HIXDQWDOVZUNNA-UHFFFAOYSA-N 0.000 description 1
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- LJGHYPLBDBRCRZ-UHFFFAOYSA-N 3-(3-aminophenyl)sulfonylaniline Chemical compound NC1=CC=CC(S(=O)(=O)C=2C=C(N)C=CC=2)=C1 LJGHYPLBDBRCRZ-UHFFFAOYSA-N 0.000 description 1
- PCTQNZRJAGLDPD-UHFFFAOYSA-N 3-(difluoromethoxy)-1,1,2,2-tetrafluoropropane Chemical compound FC(F)OCC(F)(F)C(F)F PCTQNZRJAGLDPD-UHFFFAOYSA-N 0.000 description 1
- CKOFBUUFHALZGK-UHFFFAOYSA-N 3-[(3-aminophenyl)methyl]aniline Chemical compound NC1=CC=CC(CC=2C=C(N)C=CC=2)=C1 CKOFBUUFHALZGK-UHFFFAOYSA-N 0.000 description 1
- VWIIJDNADIEEDB-UHFFFAOYSA-N 3-methyl-1,3-oxazolidin-2-one Chemical compound CN1CCOC1=O VWIIJDNADIEEDB-UHFFFAOYSA-N 0.000 description 1
- FZXVVMPYCPCKGU-UHFFFAOYSA-N 4-(3-chloro-7-azabicyclo[2.2.1]hepta-1,3,5-triene-7-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1C2=CC=C1C=C2Cl FZXVVMPYCPCKGU-UHFFFAOYSA-N 0.000 description 1
- GKZFQPGIDVGTLZ-UHFFFAOYSA-N 4-(trifluoromethyl)-1,3-dioxolan-2-one Chemical compound FC(F)(F)C1COC(=O)O1 GKZFQPGIDVGTLZ-UHFFFAOYSA-N 0.000 description 1
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 description 1
- IUAOAOWUFZRIMP-UHFFFAOYSA-N 4-[2-(1,1,1,3,3,3-hexafluoropropan-2-yl)phenyl]phthalic acid Chemical compound C(=O)(O)C=1C=C(C=CC1C(=O)O)C1=C(C=CC=C1)C(C(F)(F)F)C(F)(F)F IUAOAOWUFZRIMP-UHFFFAOYSA-N 0.000 description 1
- ZHBXLZQQVCDGPA-UHFFFAOYSA-N 5-[(1,3-dioxo-2-benzofuran-5-yl)sulfonyl]-2-benzofuran-1,3-dione Chemical compound C1=C2C(=O)OC(=O)C2=CC(S(=O)(=O)C=2C=C3C(=O)OC(C3=CC=2)=O)=C1 ZHBXLZQQVCDGPA-UHFFFAOYSA-N 0.000 description 1
- YUEBLCOCHGDFRH-UHFFFAOYSA-N 6-carbamoylnaphthalene-2-carboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)N)=CC=C21 YUEBLCOCHGDFRH-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910010238 LiAlCl 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910013528 LiN(SO2 CF3)2 Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000002015 acyclic group Chemical group 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- TUQQUUXMCKXGDI-UHFFFAOYSA-N bis(3-aminophenyl)methanone Chemical compound NC1=CC=CC(C(=O)C=2C=C(N)C=CC=2)=C1 TUQQUUXMCKXGDI-UHFFFAOYSA-N 0.000 description 1
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 150000004657 carbamic acid derivatives Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 150000001786 chalcogen compounds Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 125000006159 dianhydride group Chemical group 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- LXEJRKJRKIFVNY-UHFFFAOYSA-N terephthaloyl chloride Chemical compound ClC(=O)C1=CC=C(C(Cl)=O)C=C1 LXEJRKJRKIFVNY-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920006259 thermoplastic polyimide Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- 229910006525 α-NaFeO2 Inorganic materials 0.000 description 1
- 229910006596 α−NaFeO2 Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Cell Separators (AREA)
Description
本発明は、多孔質フィルム、電池用セパレータ及び電池に関する。 The present invention relates to a porous film, a battery separator, and a battery.
多孔質フィルムは、衛生材料、医療用材料、電池セパレータ等、多種用途に使用されている。中でも多孔質フィルムをリチウムイオン二次電池等の電池用セパレータとして用いる場合には、高い突刺し強度が要求される。 The porous film is used for various applications such as sanitary materials, medical materials, and battery separators. In particular, when a porous film is used as a battery separator such as a lithium ion secondary battery, high piercing strength is required.
突刺し強度に優れる多孔質フィルムとして、重量平均分子量が5×105以上の高分子量ポリオレフィンと、重量平均分子量が2×104以下の熱可塑性樹脂と、微粒子とを混練し、シート状に成形した後、該シートを延伸して得られる多孔質フィルムが知られている(特許文献1参照)。このような多孔質フィルムでは、製造工程で有機溶媒を用いることなく、高い分子量のポリオレフィンを容易に加工することができ、得られる多孔質フィルムは突刺し強度に優れる。 As a porous film excellent in piercing strength, a high molecular weight polyolefin having a weight average molecular weight of 5 × 10 5 or more, a thermoplastic resin having a weight average molecular weight of 2 × 10 4 or less, and fine particles are kneaded and formed into a sheet shape Then, a porous film obtained by stretching the sheet is known (see Patent Document 1). In such a porous film, a high molecular weight polyolefin can be easily processed without using an organic solvent in the production process, and the resulting porous film has excellent puncture strength.
また、電池用セパレータとして、熱可塑性ポリマーからなる多孔質フィルムに多孔質の耐熱層を積層した積層多孔質フィルムも知られている(特許文献2参照)。セパレータとして該積層多孔質フィルムを用いた電池は、過充電などで異常発熱が起きた際、多孔質フィルムが溶融しても、耐熱層によって正極と負極が接触することを防ぐことができるため、安全性に優れる。 A laminated porous film in which a porous heat-resistant layer is laminated on a porous film made of a thermoplastic polymer is also known as a battery separator (see Patent Document 2). The battery using the laminated porous film as a separator can prevent the positive electrode and the negative electrode from coming into contact with the heat-resistant layer even when the porous film melts when abnormal heat generation occurs due to overcharge, etc. Excellent safety.
このような積層多孔質フィルムの製造方法としては、耐熱性の樹脂を含む溶液を多孔質フィルム上に塗布し溶媒を揮発させて耐熱層を形成する方法や、多孔質フィルム上に前記溶液を塗布した後、貧溶媒にさらして耐熱性樹脂を析出させる方法が知られている。このような方法は簡便であり、生産性に優れる。しかしながらこのような方法で得られる積層多孔質フィルムには、耐熱層と多孔質フィルムとの接着強度の点において、さらなる改良が求められていた。 As a method for producing such a laminated porous film, a solution containing a heat-resistant resin is applied on the porous film and the solvent is volatilized to form a heat-resistant layer, or the solution is applied on the porous film. Then, a method of depositing a heat resistant resin by exposure to a poor solvent is known. Such a method is simple and excellent in productivity. However, the laminated porous film obtained by such a method has been required to be further improved in terms of the adhesive strength between the heat-resistant layer and the porous film.
本発明の目的は、多孔質フィルムに耐熱層を積層した場合に、耐熱層が剥がれにくい多孔質フィルム、多孔質フィルムと多孔質の耐熱層とが積層された積層多孔質フィルム、電池用セパレータ、及び電池を提供することにある。 The object of the present invention is, when a heat resistant layer is laminated on a porous film, a porous film in which the heat resistant layer is difficult to peel off, a laminated porous film in which a porous film and a porous heat resistant layer are laminated, a battery separator, And providing a battery.
すなわち本発明は、[1]〜[4]に係るものである。
[1]超高分子量ポリオレフィンと重量平均分子量3000以下のポリオレフィンワックスとを含む樹脂組成物を用いて得られる多孔質フィルムであって、60℃以下で溶融する成分を実質的に含まない多孔質フィルム。
[2]上記[1]における樹脂組成物が、ポリオレフィンワックスを5〜50重量%含む多孔質フィルム(ただし樹脂組成物の重量を100%とする)。
[3]上記[1]または[2]に記載の多孔質フィルムの少なくとも片面に、多孔質の耐熱層が積層されている積層多孔質フィルム。
[4]電池用セパレータである上記[1]または[2]に記載の多孔質フィルム、あるいは上記[3]に記載の積層多孔質フィルム。
[5]上記[4]に記載の電池用セパレータを含む電池。
That is, the present invention relates to [1] to [4].
[1] A porous film obtained by using a resin composition containing an ultrahigh molecular weight polyolefin and a polyolefin wax having a weight average molecular weight of 3000 or less, and substantially free of components that melt at 60 ° C. or less .
[2] A porous film in which the resin composition in the above [1] contains 5 to 50% by weight of polyolefin wax (however, the weight of the resin composition is 100%).
[3] A laminated porous film in which a porous heat-resistant layer is laminated on at least one surface of the porous film according to [1] or [2].
[4] The porous film according to [1] or [2], which is a battery separator, or the laminated porous film according to [3].
[5] A battery comprising the battery separator according to [4].
本発明によれば、多孔質フィルムに耐熱層を積層した場合に、耐熱層が剥がれにくい多孔質フィルム、多孔質フィルムと多孔質の耐熱層とが積層された積層多孔質フィルム、電池用セパレータ、及び電池を提供することができる。 According to the present invention, when a heat-resistant layer is laminated on a porous film, the heat-resistant layer is hardly peeled off, a laminated porous film in which a porous film and a porous heat-resistant layer are laminated, a battery separator, And a battery can be provided.
本発明は、超高分子量ポリオレフィンと重量平均分子量3000以下のポリオレフィンワックスとを含む樹脂組成物を用いて得られる多孔質フィルムであって、60℃以下で溶融する成分を実質的に含まない多孔質フィルムである。 The present invention relates to a porous film obtained by using a resin composition containing an ultrahigh molecular weight polyolefin and a polyolefin wax having a weight average molecular weight of 3000 or less, and is substantially free of a component that melts at 60 ° C. or less It is a film.
本発明における超高分子量ポリオレフィンとは、重量平均分子量が5×105以上のポリオレフィンであり、多孔質フィルムの強度の点から、重量平均分子量が10×105以上のポリオレフィンであることが好ましい。成形性の点から、超高分子量ポリオレフィンの重量平均分子量は通常50×105以下であり、40×105以下であることが好ましい。超高分子量ポリオレフィンとしては、例えばエチレン、プロピレン、1−ブテン、4−メチル−1−ペンテン、1−ヘキセンなどを重合した高分子量の単独重合体または共重合体が挙げられる。中でもエチレン由来の単量体単位を主体とする超高分子量ポリエチレンが好ましい。 The ultra-high molecular weight polyolefin in the present invention is a polyolefin having a weight average molecular weight of 5 × 10 5 or more, and is preferably a polyolefin having a weight average molecular weight of 10 × 10 5 or more from the viewpoint of the strength of the porous film. From the viewpoint of moldability, the weight average molecular weight of the ultrahigh molecular weight polyolefin is usually 50 × 10 5 or less, and preferably 40 × 10 5 or less. Examples of the ultrahigh molecular weight polyolefin include a high molecular weight homopolymer or copolymer obtained by polymerizing ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and the like. Of these, ultra high molecular weight polyethylene mainly composed of monomer units derived from ethylene is preferred.
本発明におけるポリオレフィンワックスとは、重量平均分子量が3000以下のポリオレフィンワックスである。ポリオレフィンワックスの重量平均分子量は、好ましくは500〜2500である。ポリオレフィンワックスとしては、エチレン単独重合体、エチレン−α−オレフィン共重合体等のポリエチレン系重合体、プロピレン単独重合体、プロピレン−α−オレフィン共重合体等のポリプロピレン系重合体、4−メチルペンテン−1重合体、ポリ(ブテン−1)、エチレン−酢酸ビニル共重合体などが挙げられる。超高分子量ポリオレフィンとの相溶性に優れるポリオレフィンワックスを選択することが好ましく、例えば超高分子量ポリオレフィンが超高分子量ポリエチレンである場合には、エチレン単独重合体またはエチレン−α−オレフィン共重合体等のポリエチレンワックスを用いることが好ましい。 The polyolefin wax in the present invention is a polyolefin wax having a weight average molecular weight of 3000 or less. The weight average molecular weight of the polyolefin wax is preferably 500-2500. Polyolefin waxes include ethylene polymers, polyethylene polymers such as ethylene-α-olefin copolymers, polypropylene polymers such as propylene homopolymers, propylene-α-olefin copolymers, 4-methylpentene- 1 polymer, poly (butene-1), ethylene-vinyl acetate copolymer and the like. It is preferable to select a polyolefin wax having excellent compatibility with the ultrahigh molecular weight polyolefin. For example, when the ultrahigh molecular weight polyolefin is ultrahigh molecular weight polyethylene, an ethylene homopolymer or an ethylene-α-olefin copolymer is used. It is preferable to use polyethylene wax.
超高分子量ポリオレフィンやポリオレフィンワックスの重量平均分子量は、一般的にGPC測定により求めることができる。 The weight average molecular weight of the ultrahigh molecular weight polyolefin or polyolefin wax can be generally determined by GPC measurement.
本発明では、前記した超高分子量ポリオレフィンとポリオレフィンワックスとを含む樹脂組成物を用いて多孔質フィルムを製造する。該樹脂組成物の重量を100重量%とするとき、ポリオレフィンワックスの割合が5〜50重量%であることが好ましく、10〜40重量%であることがより好ましい。また該樹脂組成物に含まれる超高分子量ポリオレフィンの量は、50〜95重量%であることが好ましく、60〜90重量%であることがより好ましい。このような組成の樹脂組成物は、加工性に優れると共に、超高分子量ポリオレフィンの結晶化が促進され、強度に優れる多孔質フィルムを得ることができる。 In the present invention, a porous film is produced using a resin composition containing the above-described ultrahigh molecular weight polyolefin and polyolefin wax. When the weight of the resin composition is 100% by weight, the proportion of the polyolefin wax is preferably 5 to 50% by weight, and more preferably 10 to 40% by weight. Further, the amount of the ultrahigh molecular weight polyolefin contained in the resin composition is preferably 50 to 95% by weight, and more preferably 60 to 90% by weight. The resin composition having such a composition is excellent in processability, promotes crystallization of ultrahigh molecular weight polyolefin, and can obtain a porous film excellent in strength.
本発明の多孔質フィルムは、前記した超高分子量ポリオレフィンと重量平均分子量3000以下のポリオレフィンワックスとを含む樹脂組成物を用いて得られる多孔質フィルムであって、60℃以下で溶融する成分を実質的に含まない。このような多孔質フィルムは、該多孔質フィルムの上に耐熱層を積層した場合、該耐熱層が剥がれにくいフィルムである。その理由は明らかではないが、60℃以下で溶融する成分が実質的に存在しないと、加工時に加わる熱や、後述の方法で耐熱層を多孔質フィルムに積層させる際の有機溶媒との接触によって、樹脂組成物の膨潤や溶融が起こりにくくなるため、表面が緻密な多孔質フィルムとなり、耐熱層との接触面積が広くなるため、多孔質フィルムと耐熱層との接着性が高まると考えられる。
多孔質フィルムに60℃で溶融する成分が含まれるかどうかは、示差走査熱量測定(DSC)によって確認することができる。
The porous film of the present invention is a porous film obtained using a resin composition containing the above-described ultrahigh molecular weight polyolefin and a polyolefin wax having a weight average molecular weight of 3000 or less, and substantially contains components that melt at 60 ° C. or less. Not included. Such a porous film is a film in which, when a heat resistant layer is laminated on the porous film, the heat resistant layer is hardly peeled off. The reason for this is not clear, but if there is substantially no component that melts at 60 ° C. or lower, it may be due to heat applied during processing or contact with an organic solvent when laminating the heat-resistant layer on the porous film by the method described below. Since the resin composition is less likely to swell or melt, the surface becomes a dense porous film, and the contact area with the heat resistant layer is widened. Therefore, it is considered that the adhesion between the porous film and the heat resistant layer is enhanced.
Whether or not the porous film contains a component that melts at 60 ° C. can be confirmed by differential scanning calorimetry (DSC).
本発明の多孔質フィルムは、60℃で溶融する成分を実質的に含まない材料を用いることにより得られる。すなわち、多孔質フィルムの製造に用いる樹脂組成物に含まれる超高分子量ポリオレフィンやポリオレフィンワックス、その他多孔質フィルムを製造した際に該多孔質フィルムに含まれることになる材料として、60℃で溶融する成分を実質的に含まない材料を用いることによって、本発明の多孔質フィルムを得ることができる。 The porous film of the present invention can be obtained by using a material that does not substantially contain a component that melts at 60 ° C. That is, it melts at 60 ° C. as a material to be included in the porous film when an ultra-high molecular weight polyolefin or polyolefin wax included in the resin composition used for manufacturing the porous film is produced. By using a material substantially free of components, the porous film of the present invention can be obtained.
本発明の多孔質フィルムの製造に用いる樹脂組成物は、前記超高分子量ポリオレフィン、重量平均分子量3000以下のポリオレフィンワックス以外の成分を含んでいてもよい。例えば、超高分子量ポリオレフィン、ポリオレフィンワックスに加えてフィラーを含む樹脂組成物を用いてシートを形成した後、一軸または二軸に延伸することにより、本発明の多孔質フィルムを得ることができる。また、前記シートからフィラーを除去して延伸することや、前記シートを延伸した後フィラーを除去することによっても、多孔質フィルムを得ることができる。 The resin composition used for the production of the porous film of the present invention may contain components other than the ultrahigh molecular weight polyolefin and the polyolefin wax having a weight average molecular weight of 3000 or less. For example, the porous film of the present invention can be obtained by forming a sheet using a resin composition containing a filler in addition to ultrahigh molecular weight polyolefin and polyolefin wax and then stretching the film uniaxially or biaxially. Moreover, a porous film can be obtained also by removing a filler from the said sheet | seat and extending | stretching, or removing a filler after extending | stretching the said sheet | seat.
フィラーとしては、一般的に充填剤と呼ばれる無機又は有機の微粒子を用いることができる。無機の微粒子としては、炭酸カルシウム、タルク、クレー、カオリン、シリカ、ハイドロタルサイト、珪藻土、炭酸マグネシウム、炭酸バリウム、硫酸カルシウム、硫酸マグネシウム、硫酸バリウム、水酸化アルミニウム、水酸化マグネシウム、酸化カルシウム、酸化マグネシウム、酸化チタン、アルミナ、マイカ、ゼオライト、ガラス粉、酸化亜鉛などの微粒子が使用される。特にこれらの中でも水分の少ない炭酸カルシウムや硫酸バリウムの微粒子が好ましい。有機の微粒子としては、公知の樹脂微粒子が用いられ、該樹脂としてスチレン、アクリロニトリル、メタクリル酸メチル、メタクリル酸エチル、グリシジルメタクリレート、アクリル酸メチルなどのモノマーを単独あるいは2種類以上重合して得られる重合体、メラミン、尿素などの重縮合樹脂が好ましい。 As the filler, inorganic or organic fine particles generally called a filler can be used. Inorganic fine particles include calcium carbonate, talc, clay, kaolin, silica, hydrotalcite, diatomaceous earth, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, aluminum hydroxide, magnesium hydroxide, calcium oxide, oxidation Fine particles such as magnesium, titanium oxide, alumina, mica, zeolite, glass powder, and zinc oxide are used. Among these, fine particles of calcium carbonate and barium sulfate with low moisture are particularly preferable. As the organic fine particles, known resin fine particles are used. As the resin, a polymer obtained by polymerizing monomers such as styrene, acrylonitrile, methyl methacrylate, ethyl methacrylate, glycidyl methacrylate, methyl acrylate alone or in combination of two or more kinds. Polycondensation resins such as coalescence, melamine and urea are preferred.
フィラーは、シートを延伸する前、又は延伸した後に除去してもよい。その際には、フィラーが水溶性であると、中性、酸性やアルカリ性などの水溶液で簡便に除去できるため好ましい。水溶性のフィラーとしては、例えば前述の微粒子の中ではタルク、クレー、カオリン、珪藻土、炭酸カルシウム、炭酸マグネシウム、炭酸バリウム、硫酸マグネシウム、酸化カルシウム、酸化カルシウム、水酸化マグネシウム、水酸化カルシウム、酸化亜鉛、シリカが挙げられる。これらの中でも炭酸カルシウムが好ましい。 The filler may be removed before or after the sheet is stretched. In that case, it is preferable that the filler is water-soluble because it can be easily removed with an aqueous solution such as neutral, acidic or alkaline. Examples of the water-soluble filler include talc, clay, kaolin, diatomaceous earth, calcium carbonate, magnesium carbonate, barium carbonate, magnesium sulfate, calcium oxide, calcium oxide, magnesium hydroxide, calcium hydroxide, and zinc oxide among the aforementioned fine particles. And silica. Among these, calcium carbonate is preferable.
フィラーの平均粒径は、0.01〜3μmが好ましく、0.02〜1μmがより好ましく、0.05〜0.5μmが最も好ましい。平均粒径が3μm以下であるとより突刺し強度に優れるフィルムを得ることができ、0.01μm以上であると、超高分子量ポリオレフィン及びポリオレフィンワックス内で高分散しやすくなるため、延伸によって均一に開孔しやすくなる。 The average particle size of the filler is preferably 0.01 to 3 μm, more preferably 0.02 to 1 μm, and most preferably 0.05 to 0.5 μm. When the average particle size is 3 μm or less, a film having better piercing strength can be obtained. When the average particle size is 0.01 μm or more, it becomes easy to highly disperse in the ultrahigh molecular weight polyolefin and the polyolefin wax. It becomes easy to open holes.
フィラーは、超高分子量ポリオレフィン及びポリオレフィンワックス中で分散しやすくするため、シートを延伸して多孔化する際に超高分子量ポリオレフィン及びポリオレフィンワックスとの界面剥離を促進させるため、また外部からの水分の吸収を防ぐために、表面処理が施されたものを用いることが好ましい。表面処理剤としては例えば、ステアリン酸、ラウリル酸等の高級脂肪酸又はその金属塩を挙げることができる。 In order to facilitate dispersion in the ultrahigh molecular weight polyolefin and polyolefin wax, the filler facilitates interfacial delamination with the ultra high molecular weight polyolefin and polyolefin wax when the sheet is stretched to make it porous. In order to prevent absorption, it is preferable to use a surface-treated one. Examples of the surface treatment agent include higher fatty acids such as stearic acid and lauric acid, and metal salts thereof.
フィラーを含む樹脂組成物を用いる場合、該樹脂組成物におけるフィラーの含有量は、該樹脂組成物に含まれる超高分子量ポリオレフィンとポリオレフィンワックスの合計体積を100体積部とするとき、該合計体積100体積部に対して、好ましくは15〜150体積部であり、より好ましくは25〜100体積部である。15体積部以上であれば、延伸により十分に開孔し良好な多孔質フィルムを得ることができ、また150体積部以下であると樹脂比率が高いため突刺し強度に優れた多孔質フィルムを得ることができる。 When a resin composition containing a filler is used, the filler content in the resin composition is such that the total volume of 100 when the total volume of the ultrahigh molecular weight polyolefin and polyolefin wax contained in the resin composition is 100 parts by volume. Preferably it is 15-150 volume parts with respect to a volume part, More preferably, it is 25-100 volume parts. If it is 15 parts by volume or more, it can be sufficiently opened by stretching to obtain a good porous film, and if it is 150 parts by volume or less, a resin ratio is high, so that a porous film having excellent puncture strength is obtained. be able to.
また本発明で用いる樹脂組成物には、必要に応じて本発明の目的を損じない範囲で一般に使用される添加剤(帯電防止剤、可塑剤、滑剤、酸化防止剤、増核剤など)を加えてもよい。 In addition, the resin composition used in the present invention contains additives (antistatic agents, plasticizers, lubricants, antioxidants, nucleating agents, etc.) that are generally used as long as they do not impair the purpose of the present invention. May be added.
前記した超高分子量ポリオレフィン、ポリオレフィンワックス、さらに必要に応じてフィラーや他の添加剤、他の樹脂を混練して、樹脂組成物を製造する。混練は、高いせん断力を有する混練装置にて行なうことが好ましく、具体的には、ロール、バンバリミキサー、一軸押出機、二軸押出機などが挙げられる。 The above-described ultrahigh molecular weight polyolefin, polyolefin wax, and, if necessary, a filler, other additives, and other resins are kneaded to produce a resin composition. The kneading is preferably performed in a kneading apparatus having a high shearing force. Specific examples include a roll, a Banbury mixer, a single screw extruder, and a twin screw extruder.
樹脂組成物を用いてシートを製造する方法は、特に限定はされないが、インフレーション加工、カレンダー加工、Tダイ押出加工、スカイフ法等が挙げられる。より膜厚精度の高いシートが得られることから、下記の方法により製造することが好ましい。 The method for producing a sheet using the resin composition is not particularly limited, and examples thereof include inflation processing, calendar processing, T-die extrusion processing, and Skyf method. Since a sheet with higher film thickness accuracy can be obtained, it is preferable to produce the sheet by the following method.
シートの好ましい製造方法とは、樹脂組成物に含有される超高分子量ポリオレフィンの融点より高い表面温度に調整された一対の回転成形工具を用いて、該樹脂組成物を圧延成形する方法である。回転成形工具の表面温度は、(融点+5)℃以上であることが好ましい。また表面温度の上限は、(融点+30)℃以下であることが好ましく、(融点+20)℃以下であることがさらに好ましい。一対の回転成形工具としては、ロールやベルトが挙げられる。両回転成形工具の周速度は必ずしも厳密に同一周速度である必要はなく、それらの差異が±5%以内程度であればよい。このような方法により得られるシートを用いて多孔質フィルムを製造することにより、強度やイオン透過、通気性などに優れる多孔質フィルムを得ることができる。また、前記したような方法により得られる単層のシート同士を積層したものを、多孔質フィルムの製造に使用してもよい。 A preferable production method of the sheet is a method of rolling the resin composition using a pair of rotational molding tools adjusted to a surface temperature higher than the melting point of the ultrahigh molecular weight polyolefin contained in the resin composition. The surface temperature of the rotary forming tool is preferably (melting point + 5) ° C. or higher. The upper limit of the surface temperature is preferably (melting point + 30) ° C. or less, and more preferably (melting point + 20) ° C. or less. Examples of the pair of rotary forming tools include a roll and a belt. The peripheral speeds of the two rotary forming tools do not necessarily have to be exactly the same peripheral speed, and the difference between them may be about ± 5% or less. By producing a porous film using a sheet obtained by such a method, a porous film excellent in strength, ion permeation, air permeability and the like can be obtained. Moreover, you may use what laminated | stacked the sheet | seat of the single layer obtained by the above methods for manufacture of a porous film.
樹脂組成物を一対の回転成形工具により圧延成形する際には、押出機よりストランド状に吐出した樹脂組成物を直接一対の回転成形工具間に導入してもよく、一旦ペレット化した樹脂組成物を用いてもよい。 When the resin composition is roll-formed with a pair of rotational molding tools, the resin composition discharged in a strand form from an extruder may be directly introduced between the pair of rotational molding tools, and the resin composition once pelletized May be used.
樹脂組成物を成形して得られるシートを延伸して多孔質フィルムとする方法は、特に限定はされないが、テンター、ロール、オートグラフなどの公知の装置を用いて延伸して製造することができる。延伸は一軸方向でも二軸方向でもよく、また延伸を一段で行なっても、多段階に分けて行なってもよい。樹脂とフィラーとの間に界面剥離を起こさせるために、延伸倍率は2〜12倍が好ましく、4〜10倍がより好ましい。延伸温度は、通常超高分子量ポリオレフィンの軟化点以上融点以下の温度で行なわれ、80℃〜120℃で行なうことが好ましい。このような温度で延伸を行なうことにより、延伸時にフィルムが破膜しにくく、かつ超高分子量ポリオレフィンが溶融しにくいため、樹脂とフィラーの界面剥離によって生じた孔が閉孔しにくくなる。また延伸の後に、必要に応じて孔の形態を安定化するために熱固定処理を行なってもよい。 The method of stretching the sheet obtained by molding the resin composition to form a porous film is not particularly limited, but can be produced by stretching using a known device such as a tenter, roll, or autograph. . The stretching may be uniaxial or biaxial, and the stretching may be performed in one step or in multiple steps. In order to cause interfacial peeling between the resin and the filler, the draw ratio is preferably 2 to 12 times, and more preferably 4 to 10 times. The stretching temperature is usually performed at a temperature not lower than the softening point and not higher than the melting point of the ultrahigh molecular weight polyolefin, and is preferably performed at 80 ° C to 120 ° C. By stretching at such a temperature, the film hardly breaks during stretching and the ultra-high molecular weight polyolefin hardly melts, so that the holes generated by the interfacial peeling between the resin and the filler are difficult to close. In addition, after stretching, a heat setting treatment may be performed as necessary to stabilize the shape of the holes.
樹脂組成物を成形して得られるシートから、少なくとも一部のフィラーを除去した後、延伸して多孔質フィルムを製造してもよい。あるいは、樹脂組成物を成形して得られるシートを延伸した後、少なくとも一部のフィラーを除去して多孔質フィルムを製造してもよい。フィラーを除去する方法としては、シートまたは延伸後のフィルムを、フィラーを溶解可能な液体に浸漬する方法が挙げられる。 After removing at least part of the filler from the sheet obtained by molding the resin composition, the porous film may be produced by stretching. Or after extending | stretching the sheet | seat obtained by shape | molding a resin composition, you may remove at least one part filler and manufacture a porous film. Examples of the method for removing the filler include a method of immersing the sheet or the stretched film in a liquid capable of dissolving the filler.
本発明では、前記したような方法で得られる多孔質フィルムの少なくとも片面に、多孔質の耐熱層を積層することができる。このような耐熱層を有する積層多孔質フィルムは、膜厚の均一性や耐熱性、強度、イオン透過性に優れ、またセパレータとして電池とした場合、過充電などで異常発熱が起きた際に、多孔質フィルムが溶融しても、該耐熱層が正極と負極が接触することを防ぎ安全性にも優れるため好ましい。 In the present invention, a porous heat-resistant layer can be laminated on at least one surface of the porous film obtained by the method as described above. The laminated porous film having such a heat-resistant layer is excellent in film thickness uniformity, heat resistance, strength, and ion permeability, and when a battery is used as a separator, when abnormal heat generation occurs due to overcharge, Even if the porous film is melted, the heat-resistant layer is preferable because it prevents the positive electrode and the negative electrode from contacting each other and is excellent in safety.
前記耐熱層を構成する耐熱樹脂としては、主鎖に窒素原子を含む重合体が好ましく、特に芳香族環を含むものが耐熱性の観点から好ましい。例えば、芳香族ポリアラミド(以下、「アラミド」ということがある)、芳香族ポリイミド(以下、「ポリイミド」ということがある)、芳香族ポリアミドイミドなどが挙げられる。アラミドとしては、例えばメタ配向芳香族ポリアミドやパラ配向芳香族ポリアミド(以下、「パラアラミド」ということがある)が挙げられ、膜厚が均一で通気性に優れる多孔性の耐熱層を形成しやすいことからパラアラミドが好ましい。 The heat-resistant resin constituting the heat-resistant layer is preferably a polymer containing a nitrogen atom in the main chain, and particularly preferably contains an aromatic ring from the viewpoint of heat resistance. For example, aromatic polyaramid (hereinafter sometimes referred to as “aramid”), aromatic polyimide (hereinafter sometimes referred to as “polyimide”), aromatic polyamideimide, and the like can be given. Examples of aramids include meta-oriented aromatic polyamides and para-oriented aromatic polyamides (hereinafter sometimes referred to as “para-aramids”), and it is easy to form a porous heat-resistant layer having a uniform film thickness and excellent air permeability. To para-aramid.
パラアラミドとは、パラ配向芳香族ジアミンとパラ配向芳香族ジカルボン酸ハライドの縮合重合により得られるものであり、アミド結合が芳香族環のパラ位またはそれに準じた配向位(例えば4,4’−ビフェニレン、1,5−ナフタレン、2,6−ナフタレン等のような反対方向に同軸または平行に伸びる配向位)で結合される繰り返し単位から実質的になるものである。具体的には、ポリ(パラフェニレンテレフタルアミド)、ポリ(パラベンズアミド)、ポリ(4,4’−ベンズアニリドテレフタルアミド)、ポリ(パラフェニレン−4,4’−ビフェニレンジカルボン酸アミド)、ポリ(パラフェニレン2,6−ナフタレンジカルボン酸アミド)、ポリ(2−クロローパラフェニレンテレフタルアミド)、パラフェニレンテレフタルアミド/2,6−ジクロロパラフェニレンテレフタルアミド共重合等のパラ配向型、またはパラ配向型に準じた構造を有するパラアラミドが例示される。 Para-aramid is obtained by condensation polymerization of a para-oriented aromatic diamine and a para-oriented aromatic dicarboxylic acid halide, and the amide bond is in the para position of the aromatic ring or an oriented position equivalent thereto (for example, 4,4′-biphenylene). , 1,5-naphthalene, 2,6-naphthalene, and the like, which are substantially composed of repeating units bonded in the opposite direction (orientation positions extending coaxially or in parallel). Specifically, poly (paraphenylene terephthalamide), poly (parabenzamide), poly (4,4′-benzanilide terephthalamide), poly (paraphenylene-4,4′-biphenylenedicarboxylic acid amide), poly ( (Paraphenylene 2,6-naphthalene dicarboxylic acid amide), poly (2-chloro-paraphenylene terephthalamide), paraphenylene terephthalamide / 2,6-dichloroparaphenylene terephthalamide copolymer, etc. Para-aramid having a similar structure is exemplified.
耐熱層を設ける際には、通常耐熱樹脂を溶媒に溶かした塗工液を用いる。耐熱樹脂がパラアラミドである場合、前記溶媒としては、極性アミド系溶媒または極性尿素系溶媒を用いることができ、具体的には、N,N−ジメチルホルムアミド、N,N−ジメチルアセトアミド、N−メチル−2−ピロリドン、テトラメチルウレアなどが挙げられるが、これらに限定されるものではない。
塗工性の観点から耐熱樹脂は、固有粘度1.0〜2.8dl/gの耐熱樹脂であることが好ましく、固有粘度1.7〜2.5dl/gの耐熱樹脂であることがより好ましい。ここでの固有粘度は、一度析出させた耐熱樹脂を溶解し、耐熱樹脂硫酸溶液にして測定された値である。塗工性の観点から塗工液中の耐熱樹脂濃度は0.5〜10重量%であることが好ましい。
When providing the heat-resistant layer, a coating solution obtained by dissolving a heat-resistant resin in a solvent is usually used. When the heat-resistant resin is para-aramid, a polar amide solvent or a polar urea solvent can be used as the solvent. Specifically, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl Examples include, but are not limited to, -2-pyrrolidone and tetramethylurea.
From the viewpoint of coatability, the heat resistant resin is preferably a heat resistant resin having an intrinsic viscosity of 1.0 to 2.8 dl / g, and more preferably a heat resistant resin having an intrinsic viscosity of 1.7 to 2.5 dl / g. . The intrinsic viscosity here is a value measured by dissolving the heat-resistant resin once deposited and making it into a heat-resistant resin sulfuric acid solution. From the viewpoint of coating properties, the heat-resistant resin concentration in the coating solution is preferably 0.5 to 10% by weight.
耐熱樹脂としてパラアラミドを用いる場合、パラアラミドの溶媒への溶解性を改善する目的で、パラアラミド重合時にアルカリ金属、又はアルカリ土類金属の塩化物を添加することが好ましい。具体例としては、塩化リチウムまたは塩化カルシウムが挙げられるが、これらに限定されるものではない。上記塩化物の重合系への添加量としては、縮合重合で生成するアミド基1.0モル当たり0.5〜6.0モルが好ましく、1.0〜4.0モル
がより好ましい。塩化物が0.5モル以上であると、生成するパラアラミドの溶解性が十分となり、6.0モル以下であると塩化物が溶媒に溶け残ることがなくなるため好ましい。一般には、アルカリ金属、またはアルカリ土類金属の塩化物が2重量%以上でパラアラミドの溶解性が十分となる場合が多く、10重量%以下でアルカリ金属、またはアルカリ土類金属の塩化物が極性アミド系溶媒または極性尿素系溶媒などの極性有機溶媒に溶け残ることなく完全に溶解する場合が多い。
When para-aramid is used as the heat-resistant resin, it is preferable to add an alkali metal or alkaline earth metal chloride during the para-aramid polymerization for the purpose of improving the solubility of para-aramid in a solvent. Specific examples include, but are not limited to lithium chloride or calcium chloride. The amount of the chloride added to the polymerization system is preferably 0.5 to 6.0 mol, more preferably 1.0 to 4.0 mol, per 1.0 mol of the amide group produced by condensation polymerization. If the chloride is 0.5 mol or more, the resulting para-aramid is sufficiently soluble, and if it is 6.0 mol or less, the chloride does not remain dissolved in the solvent. In general, the alkali metal or alkaline earth metal chloride is often 2% by weight or more and the solubility of para-aramid is often sufficient. At 10% by weight or less, the alkali metal or alkaline earth metal chloride is polar. In many cases, it is completely dissolved without being dissolved in a polar organic solvent such as an amide solvent or a polar urea solvent.
本発明に用いられるポリイミドとしては、芳香族の二酸無水物とジアミンの縮合重合で製造される全芳香族ポリイミドが好ましい。該二酸無水物の具体例としては、ピロメリット酸二無水物、2,2'−ビス(3,4−ジカルボキシフェニルフェニル)ヘキサフルオロプロパン、3,3'、4,4'−ビフェニルテトラカルボン酸二無水物などが挙げられる。該ジアミンの具体例としては、オキシジアニリン、パラフェニレンジアミン、ベンゾフェノンジアミン、3,3'−メチレンジアニリン、3,3'−ジアミノベンゾフェノン、3,3'−ジアミノジフェニルスルフォン、1,5−ナフタレンジアミンなどが挙げられるが、本発明は、これらに限定されるものではない。本発明においては、溶媒に可溶なポリイミドが好適に使用できる。このようなポリイミドとしては、例えば、3,3',4,4'−ジフェニルスルホンテトラカルボン酸二無水物と芳香族ジアミンとの縮合重合物のポリイミドが挙げられる。ポリイミドを溶解させる極性有機溶媒としては、アラミドを溶解させる溶媒として例示したもののほか、ジメチルスルホキサイド、クレゾール、及びo−クロロフェノールなどが好適に使用できる。 The polyimide used in the present invention is preferably a wholly aromatic polyimide produced by condensation polymerization of an aromatic dianhydride and a diamine. Specific examples of the dianhydride include pyromellitic dianhydride, 2,2′-bis (3,4-dicarboxyphenylphenyl) hexafluoropropane, 3,3 ′, 4,4′-biphenyltetra. Examples thereof include carboxylic dianhydrides. Specific examples of the diamine include oxydianiline, paraphenylenediamine, benzophenonediamine, 3,3′-methylenedianiline, 3,3′-diaminobenzophenone, 3,3′-diaminodiphenylsulfone, 1,5-naphthalene. Although diamine etc. are mentioned, this invention is not limited to these. In the present invention, a polyimide soluble in a solvent can be suitably used. An example of such a polyimide is a polyimide that is a condensation polymer of 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride and an aromatic diamine. As a polar organic solvent for dissolving polyimide, dimethyl sulfoxide, cresol, o-chlorophenol, and the like can be suitably used in addition to those exemplified as a solvent for dissolving aramid.
本発明において耐熱層を形成するために用いる塗工液は、無機微粒子を含有することが特に好ましい。任意の耐熱樹脂濃度の溶液に無機微粒子が添加された塗工液を用いて耐熱層を形成することにより、膜厚が均一で、かつ微細な多孔質である耐熱層を形成することができる。また無機微粒子の添加量によって、透気度を制御することができる。本発明における無機微粒子は、多孔質フィルムの強度や耐熱層表面の平滑性の点より、一次粒子の平均粒子径が1.0μm以下であることが好ましく、0.5μm以下であることがより好ましく、0.1μm以下であることがさらに好ましい。
該無機微粒子の含有量は多孔質フィルム中1重量%〜95重量%以下であることが好ましく、5重量%〜50重量%であることがより好ましい。1重量%以上であると、十分な多孔性が得られるためイオン透過性に優れ、95重量%以下であると十分な膜強度が得られるためハンドリングに優れる。使用する無機微粒子の形状は、特に限定はなく、球状でもランダムな形状でも使用できる。
In the present invention, the coating liquid used for forming the heat-resistant layer particularly preferably contains inorganic fine particles. By forming a heat-resistant layer using a coating solution in which inorganic fine particles are added to a solution having an arbitrary heat-resistant resin concentration, it is possible to form a heat-resistant layer having a uniform film thickness and a fine porosity. The air permeability can be controlled by the amount of inorganic fine particles added. The inorganic fine particles in the present invention preferably have an average primary particle size of 1.0 μm or less, more preferably 0.5 μm or less, from the viewpoint of the strength of the porous film and the smoothness of the heat-resistant layer surface. More preferably, it is 0.1 μm or less.
The content of the inorganic fine particles is preferably 1% by weight to 95% by weight or less in the porous film, and more preferably 5% by weight to 50% by weight. When the content is 1% by weight or more, sufficient porosity is obtained, so that the ion permeability is excellent. When the content is 95% by weight or less, sufficient film strength is obtained, so that handling is excellent. The shape of the inorganic fine particles to be used is not particularly limited, and can be spherical or random.
耐熱層を形成する際に用いられる無機微粒子は、セラミックス粉末であることが好ましい。セラミックス粉末としては、電気絶縁性の金属酸化物、金属窒化物、金属炭化物などからなるセラミックス粉末が挙げられ、例えばアルミナ、シリカ、二酸化チタン、酸化ジルコニウムなどの粉末が好ましく用いられる。上記セラミックス粉末は単独で用いてもよいし、2種類以上を混合してもよく、粒径の異なる同種あるいは異種のセラミックス粉末を任意に混合して用いることもできる。 The inorganic fine particles used when forming the heat-resistant layer are preferably ceramic powder. Examples of the ceramic powder include ceramic powders made of electrically insulating metal oxides, metal nitrides, metal carbides, and the like. For example, powders such as alumina, silica, titanium dioxide, and zirconium oxide are preferably used. The ceramic powders may be used alone, or two or more kinds thereof may be mixed, and the same or different ceramic powders having different particle sizes may be arbitrarily mixed and used.
超高分子量ポリオレフィンおよびポリオレフィンワックスを含む樹脂組成物から形成された多孔質フィルムに耐熱層を積層する方法としては、耐熱層を別に製造して後で多孔質フィルムと積層する方法、多孔質フィルムの少なくとも片面にセラミックス粉末と耐熱樹脂とを含有する塗工液を塗布して耐熱層を形成する方法などが挙げられるが、生産性の観点から後者の方法が好ましい。後者の方法としては具体的には以下のような工程を含む方法が挙げられる。
(a)耐熱樹脂100重量部を含む極性有機溶媒溶液に、耐熱樹脂100重量部に対しセラミックス粉末を1〜500重量部分散したスラリー状塗工液を調整する
(b)該塗工液を多孔質フィルムの少なくとも片面に塗工し、塗工膜を形成する。
(c)加湿、溶媒除去、あるいは耐熱樹脂を溶解しない溶媒への浸漬などの手段で、前記塗工膜から耐熱樹脂を析出させた後、必要に応じて乾燥する。
塗工液は、特開2001−316006号公報に記載の塗工装置及び特開2001−23602号公報に記載の方法により連続的に塗工することが好ましい。
As a method of laminating a heat-resistant layer on a porous film formed from a resin composition containing an ultra-high molecular weight polyolefin and a polyolefin wax, a method of separately producing a heat-resistant layer and laminating the porous film later, Although the method of apply | coating the coating liquid containing a ceramic powder and a heat resistant resin to an at least single side | surface and forming a heat resistant layer etc. are mentioned, The latter method is preferable from a viewpoint of productivity. Specifically, the latter method includes a method including the following steps.
(A) In a polar organic solvent solution containing 100 parts by weight of a heat resistant resin, a slurry-like coating liquid in which 1 to 500 parts by weight of ceramic powder is dispersed with respect to 100 parts by weight of the heat resistant resin is prepared. (B) The coating liquid is porous. Coating is performed on at least one surface of the quality film to form a coating film.
(C) The heat resistant resin is deposited from the coating film by means of humidification, solvent removal, or immersion in a solvent that does not dissolve the heat resistant resin, and then dried as necessary.
The coating liquid is preferably applied continuously by a coating apparatus described in JP-A-2001-316006 and a method described in JP-A-2001-23602.
また、耐熱樹脂を含む塗工液中に多孔質フィルムを浸漬した後乾燥することによって、多孔質フィルムの両面に耐熱層を積層することもできる。 Moreover, a heat resistant layer can also be laminated | stacked on both surfaces of a porous film by immersing a porous film in the coating liquid containing a heat resistant resin, and drying.
本発明の多孔質フィルムは、使用温度での透過性に優れ、かつ使用温度を超えた場合には低温で速やかにシャットダウン可能であり、非水系電池用セパレータとして好適である。また本発明の多孔質フィルムに耐熱層を積層させた積層多孔質フィルムは、耐熱性、強度、イオン透過性に優れ、非水系電池用セパレータ、特にリチウム2次電池用セパレータとして好適に使用することができる。 The porous film of the present invention is excellent in permeability at the use temperature and can be quickly shut down at a low temperature when the use temperature is exceeded, and is suitable as a separator for non-aqueous batteries. Moreover, the laminated porous film obtained by laminating the heat-resistant layer on the porous film of the present invention is excellent in heat resistance, strength and ion permeability, and is preferably used as a separator for non-aqueous batteries, particularly a separator for lithium secondary batteries. Can do.
本発明の電池用セパレータが、本発明の多孔質フィルムを含むものである場合、電解液の保持性と、フィルム強度およびシャットダウン性能の観点から、該多孔質フィルムの空隙率は、30〜80体積%が好ましく、さらに好ましくは40〜70体積%である。また、シャットダウン性、巻回時の電池短絡防止、電池の高電気容量化の観点から、多孔質フィルムの厚みは、5〜50μmが好ましく、より好ましくは10〜50μmが好ましく、さらに好ましくは10〜30μmである。多孔質フィルムの孔径としては0.1μm以下が好ましく、0.08μm以下がより好ましい。孔径が小さくなることによって同じ透気度でも膜抵抗の値が小さな多孔質フィルムとなる。 When the battery separator of the present invention includes the porous film of the present invention, the porosity of the porous film is 30 to 80% by volume from the viewpoints of electrolyte retention, film strength, and shutdown performance. More preferably, it is 40-70 volume%. In addition, from the viewpoint of shutdown property, battery short circuit prevention during winding, and high battery capacity, the thickness of the porous film is preferably 5 to 50 μm, more preferably 10 to 50 μm, and still more preferably 10 to 10 μm. 30 μm. The pore diameter of the porous film is preferably 0.1 μm or less, and more preferably 0.08 μm or less. By reducing the pore diameter, a porous film having a small membrane resistance value is obtained even with the same air permeability.
本発明の電池用セパレータが、本発明の積層多孔質フィルムを含むものである場合、該積層多孔質フィルムのうち、多孔質フィルムの好ましい空隙率、孔径は上記の多孔質フィルムと同様である。ただし膜厚については、積層多孔質フィルム全体として5〜50μmが好ましく、より好ましくは、10〜50μm、さらに好ましくは10〜30μmである。積層多孔質フィルムのうち、耐熱層の空隙率は、電解液の保持量および強度の観点から、30〜80体積%が好ましく、さらに好ましくは40〜70体積%である。耐熱層の膜厚は、加熱時の収縮抑制および電池にした際の負荷特性の観点から、0.5〜10μmが好ましく、さらに好ましくは1〜5μmである。 When the battery separator of the present invention includes the laminated porous film of the present invention, among the laminated porous films, preferred porosity and pore diameter of the porous film are the same as those of the porous film. However, the film thickness is preferably 5 to 50 μm, more preferably 10 to 50 μm, and still more preferably 10 to 30 μm as the whole laminated porous film. Among the laminated porous films, the porosity of the heat-resistant layer is preferably 30 to 80% by volume, more preferably 40 to 70% by volume, from the viewpoint of the amount of electrolyte retained and the strength. The film thickness of the heat-resistant layer is preferably 0.5 to 10 μm, more preferably 1 to 5 μm, from the viewpoint of suppressing shrinkage during heating and load characteristics when a battery is formed.
本発明の電池は、本発明の電池用セパレータを含むことを特徴とする。以下に、本発明の電池がリチウム電池などの非水電解液二次電池である場合について、電池用セパレータ以外の構成要素について詳細に説明する。 The battery of the present invention includes the battery separator of the present invention. Below, when the battery of this invention is nonaqueous electrolyte secondary batteries, such as a lithium battery, components other than the battery separator are demonstrated in detail.
非水電解質溶液としては、例えばリチウム塩を有機溶媒に溶解させた非水電解質溶液を用いることができる。リチウム塩としては、LiClO4、LiPF6、LiAsF6、LiSbF6、LiBF4、LiCF3SO3、LiN(SO2CF3)2、LiC(SO2CF3)3、Li2B10Cl10、低級脂肪族カルボン酸リチウム塩、LiAlCl4などのうち1種または2種以上の混合物が挙げられる。リチウム塩として、これらの中でもフッ素を含むLiPF6、LiAsF6、LiSbF6、LiBF4、LiCF3SO3、LiN(CF3SO2)2、およびLiC(CF3SO2)3からなる群から選ばれた少なくとも1種を含むものを用いることが好ましい。 As the non-aqueous electrolyte solution, for example, a non-aqueous electrolyte solution in which a lithium salt is dissolved in an organic solvent can be used. Examples of lithium salts include LiClO 4 , LiPF 6 , LiAsF 6 , LiSbF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiC (SO 2 CF 3 ) 3 , Li 2 B 10 Cl 10 , One or a mixture of two or more of lower aliphatic carboxylic acid lithium salts, LiAlCl 4 and the like can be mentioned. The lithium salt is selected from the group consisting of LiPF 6 containing fluorine, LiAsF 6 , LiSbF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , and LiC (CF 3 SO 2 ) 3 among these. It is preferable to use one containing at least one selected from the above.
非水電解質溶液で用いる有機溶媒としては、例えばプロピレンカーボネート、エチレンカーボネート、ジメチルカーボネート、ジエチルカーボネート、エチルメチルカーボネート、4−トリフルオロメチル−1,3−ジオキソラン−2−オン、1,2−ジ(メトキシカルボニルオキシ)エタンなどのカーボネート類;1,2−ジメトキシエタン、1,3−ジメトキシプロパン、ペンタフルオロプロピルメチルエーテル、2,2,3,3−テトラフルオロプロピルジフルオロメチルエーテル、テトラヒドロフラン、2−メチルテトラヒドロフランなどのエーテル類;ギ酸メチル、酢酸メチル、γ−ブチロラクトンなどのエステル類;アセトニトリル、ブチロニトリルなどのニトリル類;N,N−ジメチルホルムアミド、N,N−ジメチルアセトアミドなどのアミド類;3−メチル−2−オキサゾリドンなどのカーバメート類;スルホラン、ジメチルスルホキシド、1,3−プロパンサルトンなどの含硫黄化合物、または上記の有機溶媒にフッ素置換基を導入したものを用いることができるが、通常はこれらのうちの2種以上を混合して用いる。 Examples of the organic solvent used in the nonaqueous electrolyte solution include propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, 4-trifluoromethyl-1,3-dioxolan-2-one, 1,2-di ( Carbonates such as methoxycarbonyloxy) ethane; 1,2-dimethoxyethane, 1,3-dimethoxypropane, pentafluoropropyl methyl ether, 2,2,3,3-tetrafluoropropyl difluoromethyl ether, tetrahydrofuran, 2-methyl Ethers such as tetrahydrofuran; esters such as methyl formate, methyl acetate and γ-butyrolactone; nitriles such as acetonitrile and butyronitrile; N, N-dimethylformamide, N, N-dimethylacetate Amides such as amide; Carbamates such as 3-methyl-2-oxazolidone; Sulfur-containing compounds such as sulfolane, dimethyl sulfoxide and 1,3-propane sultone, or those obtained by introducing a fluorine substituent into the above organic solvent Usually, a mixture of two or more of these is used.
これらの中でもカーボネート類を含む混合溶媒が好ましく、環状カーボネートと非環状カーボネート、または環状カーボネートとエーテル類の混合溶媒がさらに好ましい。環状カーボネートと非環状カーボネートの混合溶媒としては、動作温度範囲が広く、負荷特性に優れ、かつ負極の活物質として天然黒鉛、人造黒鉛等の黒鉛材料を用いた場合でも難分解性であるという点で、エチレンカーボネート、ジメチルカーボネートおよびエチルメチルカーボネートを含む混合溶媒が好ましい。正極シートは、通常、正極活物質、導電材および結着剤を含む合剤を集電体上に担持したものを用いる。具体的には、該正極活物質として、リチウムイオンをドープ・脱ドープ可能な材料を含み、導電材として炭素質材料を含み、結着剤として熱可塑性樹脂などを含むものを用いることができる。該リチウムイオンをドープ・脱ドープ可能な材料としては、V、Mn、Fe、Co、Niなどの遷移金属を少なくとも1種含むリチウム複合酸化物が挙げられる。中でも好ましくは、平均放電電位が高いという点で、ニッケル酸リチウム、コバルト酸リチウムなどのα−NaFeO2型構造を母体とする層状リチウム複合酸化物、リチウムマンガンスピネルなどのスピネル型構造を母体とするリチウム複合酸化物が挙げられる。 Among these, a mixed solvent containing carbonates is preferable, and a mixed solvent of cyclic carbonate and acyclic carbonate or cyclic carbonate and ether is more preferable. The mixed solvent of cyclic carbonate and non-cyclic carbonate has a wide operating temperature range, excellent load characteristics, and is hardly decomposable even when a graphite material such as natural graphite or artificial graphite is used as the negative electrode active material. In addition, a mixed solvent containing ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate is preferable. As the positive electrode sheet, a sheet in which a mixture containing a positive electrode active material, a conductive material, and a binder is supported on a current collector is usually used. Specifically, as the positive electrode active material, a material containing a material that can be doped / undoped with lithium ions, a carbonaceous material as a conductive material, and a thermoplastic resin as a binder can be used. Examples of the material that can be doped / undoped with lithium ions include lithium composite oxides containing at least one transition metal such as V, Mn, Fe, Co, and Ni. Among these, in view of high average discharge potential, lithium based on a layered lithium composite oxide based on an α-NaFeO2 type structure such as lithium nickelate and lithium cobaltate and a spinel type structure such as lithium manganese spinel is preferable. A composite oxide is mentioned.
該リチウム複合酸化物は、種々の添加元素を含んでもよく、特にTi、V、Cr、Mn、Fe、Co、Cu、Ag、Mg、Al、Ga、InおよびSnからなる群から選ばれた少なくとも1種の金属のモル数とニッケル酸リチウム中のNiのモル数との和に対して、前記の少なくとも1種の金属が0.1〜20モル%であるように該金属を含む複合ニッケル酸リチウムを用いると、高容量での使用におけるサイクル性が向上するので好ましい。 The lithium composite oxide may contain various additive elements, particularly at least selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Cu, Ag, Mg, Al, Ga, In, and Sn. Composite nickel acid containing a metal such that the at least one metal is 0.1 to 20 mol% with respect to the sum of the number of moles of one metal and the number of moles of Ni in lithium nickelate Lithium is preferable because cycle characteristics in use at high capacity are improved.
該結着剤としての熱可塑性樹脂としては、ポリビニリデンフロライド、ビニリデンフロライドの共重合体、ポリテトラフルオロエチレン、テトラフルオロエチレン−ヘキサフロロプロピレンの共重合体、テトラフルオロエチレン−パーフルオロアルキルビニルエーテルの共重合体、エチレン−テトラフルオロエチレンの共重合体、ビニリデンフロライド−ヘキサフルオロプロピレン−テトラフルオロエチレンの共重合体、熱可塑性ポリイミド、ポリエチレン、ポリプロピレンなどが挙げられる。 As the thermoplastic resin as the binder, polyvinylidene fluoride, vinylidene fluoride copolymer, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether Copolymer, ethylene-tetrafluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, thermoplastic polyimide, polyethylene, polypropylene and the like.
該導電剤としての炭素質材料としては、天然黒鉛、人造黒鉛、コークス類、カーボンブラックなどが挙げられる。導電材として、それぞれ単独で用いてもよいし、例えば人造黒鉛とカーボンブラックとを混合して用いるといった複合導電材系を選択してもよい。 Examples of the carbonaceous material as the conductive agent include natural graphite, artificial graphite, cokes, and carbon black. As the conductive material, each may be used alone, or for example, a composite conductive material system in which artificial graphite and carbon black are mixed and used may be selected.
負極シートとしては、例えばリチウムイオンをドープ・脱ドーブ可能な材料、リチウム金属またはリチウム合金などを用いることができる。リチウムイオンをドープ・脱ドープ可能な材料としては、天然黒鉛、人造黒鉛、コークス類、カーボンブラック、熱分解炭素類、炭素繊維、有機高分子化合物焼成体などの炭素質材料、正極よりも低い電位でリチウムイオンのドープ・脱ドープを行う酸化物、硫化物等のカルコゲン化合物が挙げられる。炭素質材料として、電位平坦性が高く、また平均放電電位が低いため正極と組み合わせた場合大きなエネルギー密度が得られるという点で、天然黒鉛、人造黒鉛等の黒鉛材料を主成分とする炭素質材料が好ましい。 As the negative electrode sheet, for example, a material capable of doping and dedoping lithium ions, lithium metal, or a lithium alloy can be used. Materials that can be doped / undoped with lithium ions include carbonaceous materials such as natural graphite, artificial graphite, cokes, carbon black, pyrolytic carbons, carbon fibers, and fired organic polymer compounds, and lower potential than the positive electrode. And chalcogen compounds such as oxides and sulfides for doping and dedoping lithium ions. As a carbonaceous material, a carbonaceous material mainly composed of graphite materials such as natural graphite and artificial graphite, because it has a high potential flatness and a low average discharge potential, so that a large energy density can be obtained when combined with a positive electrode. Is preferred.
負極集電体としては、Cu、Ni、ステンレスなどを用いることができるが、特にリチウム二次電池においてはリチウムと合金を作り難く、かつ薄膜に加工しやすいという点でCuが好ましい。該負極集電体に負極活物質を含む合剤を担持させる方法としては、加圧成型する方法、または溶媒などを用いてペースト化し集電体上に塗布乾燥後プレスするなどして圧着する方法が挙げられる。 As the negative electrode current collector, Cu, Ni, stainless steel, or the like can be used. In particular, in a lithium secondary battery, Cu is preferable because it is difficult to form an alloy with lithium and it can be easily processed into a thin film. As a method of supporting the mixture containing the negative electrode active material on the negative electrode current collector, a method of pressure molding, or a method of pasting into a paste using a solvent or the like and applying pressure to the current collector by pressing after drying Is mentioned.
なお、本発明の電池の形状は、特に限定されるものではなく、ペーパー型、コイン型、円筒型、角形などのいずれであってもよい。 The shape of the battery of the present invention is not particularly limited, and may be any of a paper type, a coin type, a cylindrical type, a rectangular shape, and the like.
以下に実施例、比較例を挙げて本発明をより具体的に説明するが、本発明は以下の実施例に限定されるものではない。 Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples.
(1)DSC測定
セイコーインスツル株式会社製のSSC/5200を用いて、昇温速度10℃/分で測定した。
(1) DSC measurement Using a SSC / 5200 manufactured by Seiko Instruments Inc., the DSC measurement was performed at a heating rate of 10 ° C / min.
(2)接着強度測定
パラアラミド(ポリ(パラフェニレンテレフタルアミド))の合成
攪拌翼、温度計、窒素流入管及び粉体添加口を有する、3リットルのセパラブルフラスコを使用して、ポリ(パラフェニレンテレフタルアミド)の製造を行った。フラスコを十分乾燥し、N−メチル−2−ピロリドン(NMP)2200gを仕込み、200℃で2時間真空乾燥した塩化カルシウム粉末151.07gを添加し、100℃に昇温して完全に溶解させた。室温に戻して、パラフェニレンジアミン、68.23gを添加し完全に溶解させた。この溶液を20℃±2℃に保ったまま、テレフタル酸ジクロライド、124.97gを10分割して約5分おきに添加した。その後も攪拌しながら、溶液を20℃±2℃に保ったまま1時間熟成した。1500メッシュのステンレス金網でろ過した。得られた溶液は、パラアラミド濃度6%であった。
塗工液の調整
先に重合したパラアラミド溶液100gをフラスコに秤取し、300gのNMPを添加し、パラアラミド濃度が1.5重量%の溶液に調製して60分間攪拌した。上記のパラアラミド濃度が1.5重量%の溶液に、アルミナC(日本アエロジル社製)を6g、アドバンスドアルミナAA−03(住友化学社製)を6g混合し、240分間攪拌した。得られた溶液を1000メッシュの金網でろ過し、その後酸化カルシウム0.73gを添加して240分間攪拌して中和を行い、減圧下で脱泡してスラリー上の塗工液を得た。
接着強度の測定
得られた塗工液を多孔質フィルム上に130μm厚となるようにバーコーターで塗布した後、50℃70%RHのオーブンに15秒間入れ、多孔質フィルム上にアラミドを析出させた。1.5Rの突起を1つ有する2cm角のSUS板の上に錘を載せて、突起部を析出させたアラミド層の上に滑らせ、アラミド層が剥がれない最大の錘の重さを測定した。錘の重さが大きいほど、アラミド層と多孔質フィルムの接着強度が高い。
(2) Bond strength measurement
Synthesis of para-aramid (poly (paraphenylene terephthalamide)) Production of poly (paraphenylene terephthalamide) using a 3 liter separable flask with stirring blade, thermometer, nitrogen inlet tube and powder addition port went. The flask was sufficiently dried, charged with 2200 g of N-methyl-2-pyrrolidone (NMP), added with 151.07 g of calcium chloride powder vacuum-dried at 200 ° C. for 2 hours, heated to 100 ° C. and completely dissolved. . After returning to room temperature, 68.23 g of paraphenylenediamine was added and completely dissolved. While maintaining this solution at 20 ° C. ± 2 ° C., 124.97 g of terephthalic acid dichloride was added in 10 divided portions every about 5 minutes. Thereafter, the solution was aged for 1 hour while maintaining the temperature at 20 ° C. ± 2 ° C. with stirring. It filtered with the 1500 mesh stainless steel wire mesh. The resulting solution had a para-aramid concentration of 6%.
Preparation of coating liquid 100 g of the previously polymerized para-aramid solution was weighed into a flask, 300 g of NMP was added, and a solution having a para-aramid concentration of 1.5% by weight was prepared and stirred for 60 minutes. 6 g of alumina C (manufactured by Nippon Aerosil Co., Ltd.) and 6 g of advanced alumina AA-03 (manufactured by Sumitomo Chemical Co., Ltd.) were mixed with the above-mentioned solution having a para-aramid concentration of 1.5% by weight and stirred for 240 minutes. The obtained solution was filtered through a 1000 mesh wire mesh, then 0.73 g of calcium oxide was added, and the mixture was neutralized by stirring for 240 minutes, and defoamed under reduced pressure to obtain a coating solution on the slurry.
Measurement of adhesive strength After applying the obtained coating liquid on the porous film with a bar coater so as to have a thickness of 130 μm, it was placed in an oven at 50 ° C. and 70% RH for 15 seconds, and then applied onto the porous film. Aramid was precipitated. A weight was placed on a 2 cm square SUS plate having one 1.5R protrusion and slid onto the aramid layer on which the protrusion was deposited, and the weight of the largest weight that the aramid layer was not peeled was measured. . The greater the weight of the weight, the higher the bond strength between the aramid layer and the porous film.
実施例1
超高分子量ポリエチレン粉末(340M、三井化学社製)を70重量%、重量平均分子量1000のポリエチレンワックス(FNP−0115、日本精鑞社製)30重量%、この超高分子量ポリエチレンとポリエチレンワックスの100重量部に対して、酸化防止剤(Irg1010、チバ・スペシャリティ・ケミカルズ社製)0.4重量%、(P168、チバ・スペシャリティ・ケミカルズ社製)0.1重量%、ステアリン酸ナトリウム1.3重量%を加え、更に全体積に対して38体積%となるように平均孔径0.1μmの炭酸カルシウム(丸尾カルシウム社製)を加え、これらを粉末のままヘンシェルミキサーで混合した後、二軸混練機で溶融混練してポリオレフィン樹脂組成物とした。該ポリオレフィン樹脂組成物を表面温度が150℃一対のロールにて圧延し、膜厚約60μmのシートを作成した。このシートを塩酸水溶液(塩酸4mol/L、非イオン系界面活性剤0.5重量%)に浸漬させることで炭酸カルシウムを除去し、続いて105℃で5.8倍に延伸して多孔質フィルム(A)を得た。
多孔質フィルム(A)のDSC測定を行なったところ、60℃で溶融する成分が存在しないことが確かめられた。
前記(2)の「接着強度測定」に記載した方法に従い、多孔質フィルム(A)にアラミド層を積層してその接着強度を測定したところ、9gであった。
Example 1
70% by weight of ultrahigh molecular weight polyethylene powder (340M, manufactured by Mitsui Chemicals), 30% by weight of polyethylene wax having a weight average molecular weight of 1000 (FNP-0115, manufactured by Nippon Seiki Co., Ltd.), 100 of this ultrahigh molecular weight polyethylene and polyethylene wax Antioxidant (Irg1010, manufactured by Ciba Specialty Chemicals) 0.4 wt%, (P168, manufactured by Ciba Specialty Chemicals) 0.1 wt%, sodium stearate 1.3 wt%, based on parts by weight After adding calcium carbonate (manufactured by Maruo Calcium Co., Ltd.) having an average pore size of 0.1 μm so as to be 38% by volume with respect to the total volume, and mixing these with a Henschel mixer as a powder, a twin-screw kneader And kneaded to obtain a polyolefin resin composition. The polyolefin resin composition was rolled with a pair of rolls having a surface temperature of 150 ° C. to prepare a sheet having a thickness of about 60 μm. This sheet is immersed in an aqueous hydrochloric acid solution (hydrochloric acid 4 mol / L, nonionic surfactant 0.5 wt%) to remove calcium carbonate, and subsequently stretched 5.8 times at 105 ° C. to obtain a porous film (A) was obtained.
When the DSC measurement of the porous film (A) was performed, it was confirmed that there was no component that melted at 60 ° C.
According to the method described in “Adhesion strength measurement” of (2) above, an aramid layer was laminated on the porous film (A) and the adhesion strength was measured.
比較例1
ポリエチレンワックスとして、三井化学社製の重量平均分子量1000のハイワックス110Pを用いた以外は実施例1と同様にして、多孔質フィルム(B)を得た。
多孔質フィルム(B)のDSC測定を行なったところ、60℃以下で溶融する成分が存在することが確かめられた。
多孔質フィルム(B)に、実施例1と同様にしてアラミド層を積層してその接着強度を測定したところ、5gであった。
Comparative Example 1
A porous film (B) was obtained in the same manner as in Example 1 except that high wax 110P having a weight average molecular weight of 1000 manufactured by Mitsui Chemicals was used as the polyethylene wax.
When the DSC measurement of the porous film (B) was performed, it was confirmed that there was a component that melted at 60 ° C. or less.
When an aramid layer was laminated on the porous film (B) in the same manner as in Example 1 and the adhesive strength was measured, it was 5 g.
Claims (5)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009183164A JP5476844B2 (en) | 2009-08-06 | 2009-08-06 | Porous film, battery separator and battery |
KR1020127003023A KR101679451B1 (en) | 2009-08-06 | 2010-08-02 | Porous film, separator for batteries, and battery |
EP10806570.7A EP2463331A4 (en) | 2009-08-06 | 2010-08-02 | Porous film, separator for batteries, and battery |
CN201080034814.7A CN102471518B (en) | 2009-08-06 | 2010-08-02 | Porous film, separator for batteries, and battery |
US13/388,874 US9259900B2 (en) | 2009-08-06 | 2010-08-02 | Porous film, battery separator, and battery |
KR1020167032188A KR101791376B1 (en) | 2009-08-06 | 2010-08-02 | Porous film, separator for batteries, and battery |
PCT/JP2010/063437 WO2011016571A1 (en) | 2009-08-06 | 2010-08-02 | Porous film, separator for batteries, and battery |
TW099125740A TW201125190A (en) | 2009-08-06 | 2010-08-03 | Porous film, separator for batteries, and battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009183164A JP5476844B2 (en) | 2009-08-06 | 2009-08-06 | Porous film, battery separator and battery |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2011032445A JP2011032445A (en) | 2011-02-17 |
JP5476844B2 true JP5476844B2 (en) | 2014-04-23 |
Family
ID=43761836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009183164A Active JP5476844B2 (en) | 2009-08-06 | 2009-08-06 | Porous film, battery separator and battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP5476844B2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3168901A1 (en) | 2015-11-13 | 2017-05-17 | Sumitomo Chemical Company Limited | Porous layer for nonaqueous electrolyte secondary battery separator, and nonaqueous electrolyte secondary battery laminated separator |
DE102021207299A1 (en) | 2020-07-10 | 2022-01-13 | Sumitomo Chemical Company, Limited | Method for testing a separator for a non-aqueous electrolyte secondary battery, method for producing a non-aqueous electrolyte secondary battery, apparatus for testing a separator for a non-aqueous electrolyte secondary battery, apparatus for manufacturing a separator for a non-aqueous electrolyte secondary battery and separator for A NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY |
DE102021003633A1 (en) | 2020-07-17 | 2022-01-20 | Sumitomo Chemical Company, Limited | LAMINATED SECONDARY BATTERY BODY WITH ANHYDROUS ELECTROLYTE |
DE102021004488A1 (en) | 2020-09-03 | 2022-03-03 | Sumitomo Chemical Company, Limited | Porous layer for nonaqueous electrolyte secondary battery |
DE102021004489A1 (en) | 2020-09-03 | 2022-03-03 | Sumitomo Chemical Company, Limited | Porous layer for nonaqueous electrolyte secondary battery |
DE102022213166A1 (en) | 2021-12-07 | 2023-06-07 | Sumitomo Chemical Company, Limited | Porous layer for non-aqueous electrolyte secondary battery |
DE102023205104A1 (en) | 2022-06-02 | 2023-12-07 | Sumitomo Chemical Company, Limited | Separator for a secondary battery with non-aqueous electrolyte |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104582949B (en) * | 2012-08-23 | 2016-08-17 | 捷恩智株式会社 | The composite porous film of excellent heat resistance |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69915132T2 (en) * | 1998-10-01 | 2004-12-09 | Tonen Chemical Corp. | Microporous polyolefin membrane and method of making the same |
JP5140896B2 (en) * | 2000-06-14 | 2013-02-13 | 住友化学株式会社 | Porous film and battery separator using the same |
JP4677663B2 (en) * | 2000-10-26 | 2011-04-27 | 東レ東燃機能膜合同会社 | Polyolefin microporous membrane |
JP4839882B2 (en) * | 2005-03-31 | 2011-12-21 | 住友化学株式会社 | Sheet made of polyolefin resin composition, porous film, and battery separator |
-
2009
- 2009-08-06 JP JP2009183164A patent/JP5476844B2/en active Active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3168901A1 (en) | 2015-11-13 | 2017-05-17 | Sumitomo Chemical Company Limited | Porous layer for nonaqueous electrolyte secondary battery separator, and nonaqueous electrolyte secondary battery laminated separator |
DE102021207299A1 (en) | 2020-07-10 | 2022-01-13 | Sumitomo Chemical Company, Limited | Method for testing a separator for a non-aqueous electrolyte secondary battery, method for producing a non-aqueous electrolyte secondary battery, apparatus for testing a separator for a non-aqueous electrolyte secondary battery, apparatus for manufacturing a separator for a non-aqueous electrolyte secondary battery and separator for A NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY |
DE102021003633A1 (en) | 2020-07-17 | 2022-01-20 | Sumitomo Chemical Company, Limited | LAMINATED SECONDARY BATTERY BODY WITH ANHYDROUS ELECTROLYTE |
DE102021004488A1 (en) | 2020-09-03 | 2022-03-03 | Sumitomo Chemical Company, Limited | Porous layer for nonaqueous electrolyte secondary battery |
DE102021004489A1 (en) | 2020-09-03 | 2022-03-03 | Sumitomo Chemical Company, Limited | Porous layer for nonaqueous electrolyte secondary battery |
DE102022213166A1 (en) | 2021-12-07 | 2023-06-07 | Sumitomo Chemical Company, Limited | Porous layer for non-aqueous electrolyte secondary battery |
DE102023205104A1 (en) | 2022-06-02 | 2023-12-07 | Sumitomo Chemical Company, Limited | Separator for a secondary battery with non-aqueous electrolyte |
Also Published As
Publication number | Publication date |
---|---|
JP2011032445A (en) | 2011-02-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9259900B2 (en) | Porous film, battery separator, and battery | |
KR101621579B1 (en) | Resin composition, sheet, and porous film | |
JP5140896B2 (en) | Porous film and battery separator using the same | |
CA2350379C (en) | Porous film and separator for battery using the same | |
JP5920496B2 (en) | Laminated porous film and non-aqueous electrolyte secondary battery | |
JP5286817B2 (en) | Separator | |
JP5476844B2 (en) | Porous film, battery separator and battery | |
US9741990B2 (en) | Nonaqueous electrolyte secondary battery laminated separator | |
JP2017103036A (en) | Separator for non-aqueous electrolyte secondary battery, laminated separator for non-aqueous electrolyte secondary battery, member for non-aqueous electrolyte secondary batter and non-aqueous electrolyte secondary battery | |
JP5714441B2 (en) | Separator | |
JP2017103045A (en) | Separator for non-aqueous electrolyte secondary battery, laminated separator for non-aqueous electrolyte secondary battery, member for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery | |
JP2012094493A (en) | Slurry and method of manufacturing separator for nonaqueous electrolyte secondary battery using that slurry | |
JP2012077220A (en) | Method for producing polyolefin resin composition, and method for producing porous film made of polyolefin resin | |
JP5476845B2 (en) | Porous film, battery separator and battery | |
JP2012076384A (en) | Laminated porous film and battery | |
JP5874781B2 (en) | Resin composition, sheet, and porous film | |
US20190123333A1 (en) | Nonaqueous electrolyte secondary battery porous layer | |
JP2017103201A (en) | Separator for non-aqueous electrolyte secondary battery, laminated separator for non-aqueous electrolyte secondary battery, member for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery | |
JP2017103199A (en) | Separator for non-aqueous electrolyte secondary battery, laminated separator for non-aqueous electrolyte secondary battery, member for non-aqueous electrolyte secondary batter and non-aqueous electrolyte secondary battery |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20120621 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20131105 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20131212 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20140114 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20140127 |
|
R151 | Written notification of patent or utility model registration |
Ref document number: 5476844 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |