JP5429811B2 - リチウムイオン二次電池用セパレータおよびリチウムイオン二次電池 - Google Patents
リチウムイオン二次電池用セパレータおよびリチウムイオン二次電池 Download PDFInfo
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- JP5429811B2 JP5429811B2 JP2010046069A JP2010046069A JP5429811B2 JP 5429811 B2 JP5429811 B2 JP 5429811B2 JP 2010046069 A JP2010046069 A JP 2010046069A JP 2010046069 A JP2010046069 A JP 2010046069A JP 5429811 B2 JP5429811 B2 JP 5429811B2
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- separator
- porous layer
- lithium ion
- ion secondary
- secondary battery
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 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 1
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
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- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N methyl acetate Chemical compound COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
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- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
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- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
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- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- 235000020679 tap water Nutrition 0.000 description 1
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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- 239000002349 well water Substances 0.000 description 1
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- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 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
- Cell Separators (AREA)
- Secondary Cells (AREA)
Description
層(II)の厚みをA(μm)とし、前記多孔質層(II)の密度をB(g/cm3)としたとき、A×Bが3〜24であり、セパレータ全体の厚みが12〜36μmであることを特徴とするものである。
つ有していてもよく、複数有していてもよい。例えば、多孔質層(I)の両面に多孔質層(II)を配置してセパレータを構成したり、多孔質層(II)の両面に多孔質層(I)を配置してセパレータを構成してもよい。ただし、セパレータの有する層数が多くなりすぎると、セパレータの厚みを増やして電池の内部抵抗の増加やエネルギー密度の低下を招く虞があるので好ましくなく、セパレータ中の層数は5層以下であることが好ましい。
P = 100−(Σai/ρi)×(m/t) (1)
ここで、前記式中、ai:質量%で表した成分iの比率、ρi:成分iの密度(g/cm3)、m:セパレータの単位面積あたりの質量(g/cm2)、t:セパレータの厚み(cm)である。
スラリーA:
粒状ジルコニア(化学式ZrO2、密度5.8g/cm3、平均粒径1μm)1000gに、イオン交換水1000gと粒状ジルコニア100質量部に対して1質量部のポリアクリル酸アンモニウム(分散剤)とを添加し、これを卓上ボールミルにて6日間分散を行って分散液を得た。
粒状ジルコニアに代えて、粒状チタン酸バリウム(化学式BaTiO3、密度6.0g/cm3、平均粒径1μm)を用いた以外は、スラリーAと同様の手法でスラリーBを調製した。
粒状ジルコニアに代えて、粒状硫酸バリウム(化学式BaSO4、密度4.5g/cm3、平均粒径1μm)を用いた以外は、スラリーAと同様の手法でスラリーCを調製した。
粒状ジルコニアに代えて、板状アルミナ(化学式Al2O3、密度3.9g/cm3、平均粒径1μm)を用いた以外は、スラリーAと同様の手法でスラリーDを調製した。
粒状ジルコニアに代えて、板状ベーマイト(化学式Al2O3・H2OまたはAlOOH、密度3.0g/cm3、平均粒径1μm)を用いた以外は、スラリーAと同様の手法でスラリーEを調製した。
粒状ジルコニアに代えて、粒状シリカ(化学式SiO2、密度2.2g/cm3、平均粒径1μm)を用いた以外は、スラリーAと同様の手法でスラリーFを調製した。
<セパレータの製造>
片面にコロナ放電処理を施した長尺のポリエチレン製微多孔膜(厚み10μm)のコロナ放電処理面に、前記スラリーAを、乾燥後の多孔質層(II)の厚みが2μmとなるように塗布し、乾燥してセパレータを製造した。
正極活物質であるLiCoO2:85質量部、導電助剤であるアセチレンブラック:10質量部、およびバインダであるPVDF:5質量部を、N−メチル−2−ピロリドン(NMP)を溶剤として均一になるように混合して、正極合剤含有ペーストを調製した。このペーストを、集電体となる厚み15μmのアルミニウム箔の両面に、塗布長が表面320mm、裏面250mmになるように間欠塗布し、乾燥した後、カレンダー処理を行って、全厚が150μmになるように正極合剤層の厚みを調整し、幅43mmになるように切断して、長さ340mm、幅43mmの正極を作製した。更にこの正極のアルミニウム箔の露出部にタブ付けを行った。
前記のようにして得られた正極と負極とを、前記のセパレータを介して重ね合わせ、渦巻状に巻回して巻回構造の電極群とした。この電極群を直径14mm、高さ50mmの円筒状の電池ケース内に挿入し、有機電解液(エチレンカーボネートとエチルメチルカーボネートを1:2の体積比で混合した溶媒に、LiPF6を1.2mol/lの濃度で溶解させた溶液)を注入し、電池ケースの開口部を定法に従って封止してリチウムイオン二次電池を製造した。
多孔質層(II)の形成に用いたスラリー、乾燥後の多孔質層(II)の厚み、および多孔質層(I)に用いたポリエチレン製微多孔膜の厚みを、表1に示す通りにした以外は、実施例1と同様にしてセパレータを製造し、これらのセパレータを用いた以外は、実施例1と同様にしてリチウムイオン二次電池を製造した。
スラリーAとスラリーDとを1:1(質量比)で混合して調製したスラリーを多孔質層(II)の形成に用い、乾燥後の多孔質層(II)の厚み、および多孔質層(I)に用いたポリエチレン製微多孔膜の厚みを、表1に示す通りにした以外は、実施例1と同様にしてセパレータを製造し、このセパレータを用いた以外は、実施例1と同様にしてリチウムイオン二次電池を製造した。
スラリーAとスラリーEとを1:1(質量比)で混合して調製したスラリーを多孔質層(II)の形成に用い、乾燥後の多孔質層(II)の厚み、および多孔質層(I)に用いたポリエチレン製微多孔膜の厚みを、表1に示す通りにした以外は、実施例1と同様にしてセパレータを製造し、このセパレータを用いた以外は、実施例1と同様にしてリチウムイオン二次電池を製造した。
熱収縮率(%) = 100×(10−x)/10
[なお、前記式中、xは150℃に設定した恒温槽内で1時間放置した後のセパレータの縦または横の寸法(cm)である。]
Claims (9)
- 正極、負極、有機電解液およびセパレータを有するリチウムイオン二次電池に用いられるセパレータであって、
融点が80〜170℃である熱可塑性樹脂を主体とする、延伸された微多孔膜からなる多孔質層(I)と、耐熱性微粒子を主体として含む多孔質層(II)とを有しており、
前記多孔質層(II)の厚みをA(μm)とし、前記多孔質層(II)の密度をB(g/cm3)としたとき、Bが2.0〜4であり、かつA×Bが3〜24であり、
セパレータ全体の厚みが12〜36μmであることを特徴とするリチウムイオン二次電池用セパレータ。 - 多孔質層(II)の厚みが、6μm以下である請求項1に記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(II)の厚みが、2μm以上である請求項1または2に記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(I)の厚みが、10〜30μmである請求項1〜3のいずれかに記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(II)の含有する耐熱性微粒子の密度が4g/cm3以上である請求項1〜4のいずれかに記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(II)は、耐熱性微粒子として、ジルコニア、チタン酸バリウムおよび硫酸バリウムよりなる群から選択される少なくとも1種の材料の微粒子を含む請求項1〜5のいずれかに記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(II)の空孔率が、20〜60%である請求項1〜6のいずれかに記載のリチウムイオン二次電池用セパレータ。
- 多孔質層(II)の構成成分の全体積中、耐熱性微粒子の含有量が70体積%以上である請求項1〜7のいずれかに記載のリチウムイオン二次電池用セパレータ。
- 正極、負極、有機電解液およびセパレータを有するリチウムイオン二次電池であって、
前記セパレータが、請求項1〜8のいずれかに記載のリチウムイオン二次電池用セパレータであることを特徴とするリチウムイオン二次電池。
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CN101218695B (zh) * | 2005-12-08 | 2011-07-20 | 日立麦克赛尔株式会社 | 电化学元件用隔板及其制造方法以及电化学元件及其制造方法 |
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