JP6989263B2 - 金属二次電池用セパレータ - Google Patents
金属二次電池用セパレータ Download PDFInfo
- Publication number
- JP6989263B2 JP6989263B2 JP2016550059A JP2016550059A JP6989263B2 JP 6989263 B2 JP6989263 B2 JP 6989263B2 JP 2016550059 A JP2016550059 A JP 2016550059A JP 2016550059 A JP2016550059 A JP 2016550059A JP 6989263 B2 JP6989263 B2 JP 6989263B2
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- JP
- Japan
- Prior art keywords
- polymer electrolyte
- negative electrode
- metal
- secondary battery
- lithium
- 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.)
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- 239000002184 metal Substances 0.000 title claims description 60
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- 239000010410 layer Substances 0.000 claims description 70
- 239000011148 porous material Substances 0.000 claims description 24
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- 239000000463 material Substances 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 8
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- 239000010419 fine particle Substances 0.000 description 63
- 229910052744 lithium Inorganic materials 0.000 description 55
- 239000004642 Polyimide Substances 0.000 description 42
- -1 tetracarboxylic acid dianhydride Chemical class 0.000 description 41
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- 230000000052 comparative effect Effects 0.000 description 27
- 239000003960 organic solvent Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 22
- 229920005575 poly(amic acid) Polymers 0.000 description 21
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 102100023520 Vang-like protein 2 Human genes 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- BQENXCOZCUHKRE-UHFFFAOYSA-N [La+3].[La+3].[O-][Mn]([O-])=O.[O-][Mn]([O-])=O.[O-][Mn]([O-])=O Chemical compound [La+3].[La+3].[O-][Mn]([O-])=O.[O-][Mn]([O-])=O.[O-][Mn]([O-])=O BQENXCOZCUHKRE-UHFFFAOYSA-N 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- OHOIHSTWKIMQNC-UHFFFAOYSA-N [Li].[P]=O Chemical compound [Li].[P]=O OHOIHSTWKIMQNC-UHFFFAOYSA-N 0.000 description 1
- NLGOTHQMVKZTBP-KVVVOXFISA-N acetic acid;(z)-octadec-9-en-1-amine Chemical compound CC(O)=O.CCCCCCCC\C=C/CCCCCCCCN NLGOTHQMVKZTBP-KVVVOXFISA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000004279 alanine Nutrition 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- YSJGOMATDFSEED-UHFFFAOYSA-M behentrimonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCCCCCC[N+](C)(C)C YSJGOMATDFSEED-UHFFFAOYSA-M 0.000 description 1
- SHXBKOTUGHTKLV-UHFFFAOYSA-N benzene-1,2,4,5-tetracarboxylic acid;dihydrate Chemical compound O.O.OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O SHXBKOTUGHTKLV-UHFFFAOYSA-N 0.000 description 1
- HFACYLZERDEVSX-UHFFFAOYSA-N benzidine Chemical group C1=CC(N)=CC=C1C1=CC=C(N)C=C1 HFACYLZERDEVSX-UHFFFAOYSA-N 0.000 description 1
- VEZXCJBBBCKRPI-UHFFFAOYSA-N beta-propiolactone Chemical compound O=C1CCO1 VEZXCJBBBCKRPI-UHFFFAOYSA-N 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- JYPVGDJNZGAXBB-UHFFFAOYSA-N bismuth lithium Chemical compound [Li].[Bi] JYPVGDJNZGAXBB-UHFFFAOYSA-N 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000001191 butyl (2R)-2-hydroxypropanoate Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229910021525 ceramic electrolyte Inorganic materials 0.000 description 1
- 229960001927 cetylpyridinium chloride Drugs 0.000 description 1
- YMKDRGPMQRFJGP-UHFFFAOYSA-M cetylpyridinium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+]1=CC=CC=C1 YMKDRGPMQRFJGP-UHFFFAOYSA-M 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 125000000853 cresyl group Chemical class C1(=CC=C(C=C1)C)* 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- GEQHKFFSPGPGLN-UHFFFAOYSA-N cyclohexane-1,3-diamine Chemical compound NC1CCCC(N)C1 GEQHKFFSPGPGLN-UHFFFAOYSA-N 0.000 description 1
- VKIRRGRTJUUZHS-UHFFFAOYSA-N cyclohexane-1,4-diamine Chemical compound NC1CCC(N)CC1 VKIRRGRTJUUZHS-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229960004670 didecyldimethylammonium chloride Drugs 0.000 description 1
- 229940019778 diethylene glycol diethyl ether Drugs 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical class CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 description 1
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
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- 150000002170 ethers Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 1
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 1
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 1
- 239000011245 gel electrolyte Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- QPPQHRDVPBTVEV-UHFFFAOYSA-N isopropyl dihydrogen phosphate Chemical compound CC(C)OP(O)(O)=O QPPQHRDVPBTVEV-UHFFFAOYSA-N 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- JWZCKIBZGMIRSW-UHFFFAOYSA-N lead lithium Chemical compound [Li].[Pb] JWZCKIBZGMIRSW-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- OJURWUUOVGOHJZ-UHFFFAOYSA-N methyl 2-[(2-acetyloxyphenyl)methyl-[2-[(2-acetyloxyphenyl)methyl-(2-methoxy-2-oxoethyl)amino]ethyl]amino]acetate Chemical compound C=1C=CC=C(OC(C)=O)C=1CN(CC(=O)OC)CCN(CC(=O)OC)CC1=CC=CC=C1OC(C)=O OJURWUUOVGOHJZ-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- HTBSGBIWKJSAGD-UHFFFAOYSA-N n,n-dimethylpropan-1-amine oxide Chemical compound CCC[N+](C)(C)[O-] HTBSGBIWKJSAGD-UHFFFAOYSA-N 0.000 description 1
- NTNWKDHZTDQSST-UHFFFAOYSA-N naphthalene-1,2-diamine Chemical compound C1=CC=CC2=C(N)C(N)=CC=C21 NTNWKDHZTDQSST-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- IIGMITQLXAGZTL-UHFFFAOYSA-N octyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCC IIGMITQLXAGZTL-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 239000011242 organic-inorganic particle Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229960000380 propiolactone Drugs 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
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- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本発明において用いられる多孔質ポリイミドフィルムは、ポリイミドを主成分とするフィルムであって、両主表面に開口した孔を有し、フィルム内部で個々の細孔が連通したものが特に限定されることなく使用できる。
上記の3DOM構造を有する多孔質ポリイミドフィルムは、例えば、次のような方法によって製造することができる。
上記のとおり、多孔質ポリイミドフィルムを形成するに際し、予めポリアミド酸またはポリイミドを有機溶媒中に均一に溶解し、ワニス化して無機微粒子の焼結体への含浸を行う。ワニスの製造は、例えば、下記のとおりに行うことができる。
ワニスの調製は、有機溶剤とポリアミド酸またはポリイミドを任意の比率で混合するか、有機溶剤中でポリアミド酸を重合して行われる。
本発明の多孔質ポリイミドフィルムは、上記3DOM構造を有する多孔質ポリイミドフィルム以外にも、ポリアミド酸またはポリイミドと無機微粒子とを含有するワニスを準備し、一旦成膜したのち焼成して、得られたポリイミド−無機微粒子複合フィルムから、無機微粒子を適切な方法を選択して除去することにより製造してもかまわない。その際、上記微粒子を除去する工程の前に、ポリイミド−無機微粒子複合フィルム表面のポリイミド部分の少なくとも一部を除去するか、または、微粒子除去工程後に、多孔質ポリイミドフィルム表面の少なくとも一部を除去する工程を設けてもよい。
上記のワニスは、予め微粒子が分散した有機溶剤とポリアミド酸またはポリイミドを任意の比率で混合するか、無機微粒子を予め分散した有機溶剤中でテトラカルボン酸二無水物およびジアミンを重合してポリアミド酸とするか、さらにイミド化してポリイミドとすることで製造でき、最終的に、その粘度を300〜1500cPとすることが好ましく、400〜700cPの範囲がより好ましい。ワニスの粘度がこの範囲内であれば、均一に成膜をすることが可能である。
本発明のポリマー電解質層の形成に用いられるポリマー電解質は、真性のポリマー電解質であってもよく、あるいは有機ポリマーと液体電解質との混合物であってもよい。
本発明の第二の態様は、金属負極と正極との間に、電解液および本発明の第一の態様である金属二次電池用多孔質セパレータが配置された金属二次電池である。上記本発明の金属二次電池用多孔質セパレータのポリマー電解質層が形成された主表面を、上記金属負極側に配置して使用する。
<3DOMポリイミドセパレータの製造>
下記要領にて3DOM構造を有する多孔質ポリイミドフィルム(以下、「3DOMポリイミドセパレータ」という。)を製造した後、ポリマー電解質層を設けセパレータA〜Cを得た。
ポリマー電解質のポリマー成分として、メタクリル酸のPEOエステル(PEGMA)とポリステレン(PSt)とのプロック共重合体が中心から放射状に伸びたスター構造ポリマー(S−MESポリマー)(日本曹達株式会社)を使用した。1,2−ジメトキシエタン(DME)に30重量%のS−MESポリマーを溶解した溶液に、リチウム塩(LiPF6)中のリチウム([Li])とS−MESポリマー中のエチレンオキシド([EO])の化学量論比が[Li]/[EO]=0.01となるよう、リチウム塩を添加しポリマー電解質溶液とした。
ポリマー電解質のリチウム塩を、化学量論比が[Li]/[EO]=0.02となるよう調節したほかは、セパレータAと同様にしてセパレータを作製した。
ポリマー電解質のリチウム塩を、化学量論比が[Li]/[EO]=0.03となるよう調節したほかは、セパレータAと同様にしてセパレータを作製した。
<参考例1>
アルゴン雰囲気ドライボックス内において、厚さ約10μmの銅箔の付いた厚さ20μmの金属リチウムをガラス基板上に、銅箔をガラス基板面に向けて静置した。前記金属リチウムに対し、上記のポリマー電解質溶液を、ドクターブレード法を用いて塗布した。その後、真空乾燥によりDME溶媒を除去し、ポリマー電解質層を設けた負極をガラス基板から剥離した。負極の金属リチウム上に形成されたポリマー電解質層の厚みは、およそ9μmであった。
アルゴン雰囲気ドライボックス内において、厚さ約6μmの銅箔の付いた厚さ20μmの金属リチウムをガラス基板上に、銅箔をガラス基板面に向けて静置した。前記金属リチウムに対し、上記のポリマー電解質溶液を、ドクターブレード法を用いて塗布した。その後、真空乾燥によりDME溶媒を除去し、ポリマー電解質層を設けた負極をガラス基板から剥離した。負極の金属リチウム上に形成されたポリマー電解質層の厚みは、およそ5〜6μmであった。なお、ポリマー電解質層の厚みは、ポリマー電解質溶液を負極である金属リチウム上に塗工する際のブレードのギャップ(塗工厚み)によって制御できることが確認されている。例えば、ガラス基板上に厚さ20μmのリチウム金属と厚さ6μmの銅箔とを静置し、その上からギャップ50μmでポリマー電解質液を塗工した際には、ポリマー電解質溶液の厚みは、24(50−20−6)μmとなる。その後、乾燥させガラス基板から剥離することにより、表面に厚み8〜10μmのポリマー電解質層が形成される負極が作製される。
ポリマー電解質溶液として、1,2−ジメトキシエタン(DME)中のS−MESポリマーの濃度を10重量%となるよう調節した以外は、参考例2と同様にして、ポリマー電解質層を設けた負極を作製した。
負極の金属リチウム上に形成されたポリマー電解質層の厚みを4〜5μmとなるように調節した以外は、参考例3と同様にして、ポリマー電解質層を設けた負極を作製した。なお、本参考例では、ギャップ40μmでポリマー電解質溶液を塗工したものである。
負極の金属リチウム上に形成されたポリマー電解質層の厚みを3〜4μmとなるように調節した以外は、参考例3と同様にして、ポリマー電解質層を設けた負極を作製した。なお、本参考例では、ギャップ30μmでポリマー電解質溶液を塗工したものである。
厚さ約10μmの銅箔の付いた厚さ20μmのリチウム金属のみを負極とした。
<比較例3>
厚さ約6μmの銅箔の付いた厚さ20μmのリチウム金属のみを負極とした。
正極活物質として、1−メチル−2−ピロリドン(NMP)中に、活物質LiCoO2(LCO)、導電助剤としてアセチレンブラック、バインダーとしてPVDFを92:4:4の重量比で混合してスラリーを調製した。このスラリーを、集電体Al箔上に塗布し、乾燥させて塗布電極を作製した。この塗布電極を、直径14mmの円形に打ち抜き、正極とした。また、負極には、厚さ10μmの銅箔の付いた厚さ20μmの金属リチウムを、円形に打ち抜いたものを使用した。
電池充放電装置HJ1001SM8A(北斗電工株式会社製)および充放電試験装置TOSCAT−3000U(東洋システム株式会社製)を用い、上記した試作コインセルを使用して、初期サイクル試験は、カットオフ電圧を3.0〜4.2Vとして30℃の恒温槽内で充放電試験を行った。充電は、CC、0.2Cの条件で4.2Vまで行い、その後、CVの条件で0.02Cまで行った。初期サイクル試験後のサイクル特性試験の条件は、カットオフ電圧を3.0〜4.2Vとして30℃の恒温槽内で充放電試験を行った。充電は、CC、1.0Cの条件で4.2Vまで行い、その後、CVの条件で0.1Cまで行った。放電は、CC、1.0Cの条件で3.0Vまで行った。各試作コインセルの充放電クーロン効率と容量維持率の評価結果を、表1及び表2に示す。
Solartron 1287型ポテンショ/ガルバノスタットおよび1255B型高周波応答アナライザを用い、30℃の恒温槽内で、実施例3および比較例1と参考例5および比較例3とのコインセルのサイクル特性試験前と、サイクル特性試験による、1サイクル、50サイクルおよび100サイクル後の電池の内部抵抗の測定を行った。測定条件は、入力交流振幅5mV、周波数範囲10mHz〜1.0MHzである。サイクル特性試験前(0サイクル)、50サイクルおよび100サイクル後の各試作コインセルのRfおよびRcの評価結果を、表3および表4に示す。
実施例3と比較例1のコインセルにLCO電極容量の100%に相当する充電量を充電した後、および、上記充放電試験100サイクル後の実施例3と比較例1のコインセルから、それぞれリチウム負極を取出し、走査型電子顕微鏡JSM−5310、SEM(日本電子(株)製)を用いてその表面を観察した。また、市販のポリプロピレンセパレータを使用したコインセル(比較例2)において、同条件に供したリチウム負極を取出し同様の観察を行った。さらに、参考例2〜5および比較例3のコインセルにおいて、同条件に供したリチウム負極を取出し同様の観察を行った。
Claims (3)
- 多孔質ポリイミドフィルムの少なくとも一方の主表面の表層にポリマー電解質層が形成された金属二次電池用多孔質セパレータであって、
前記多孔質ポリイミドフィルムの前記主表面に存在する開口部を形成する空孔が、前記ポリマー電解質により充填され、
前記多孔質ポリイミドフィルムの少なくとも一方の主表面に担持されたポリマー電解質材料、および該主表面から連続する層状領域中の空孔内に担持されたポリマー電解質材料によって、前記ポリマー電解質層が構成され、かつ
前記ポリマー電解質層の負極側表面が平滑化されている金属二次電池用多孔質セパレータ。 - 前記ポリマー電解質層が金属塩および/またはフィラーを含有する請求項1に記載の金属二次電池用多孔質セパレータ。
- 金属負極と正極との間に、電解液および請求項1または2に記載の金属二次電池用多孔質セパレータが配置された金属二次電池であって、前記金属二次電池用多孔質セパレータのポリマー電解質層が形成された主表面が前記金属負極側に配置される金属二次電池。
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