JP2012238621A - 非水電解質電池用セパレータおよび非水電解質電池 - Google Patents
非水電解質電池用セパレータおよび非水電解質電池 Download PDFInfo
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- JP2012238621A JP2012238621A JP2012201365A JP2012201365A JP2012238621A JP 2012238621 A JP2012238621 A JP 2012238621A JP 2012201365 A JP2012201365 A JP 2012201365A JP 2012201365 A JP2012201365 A JP 2012201365A JP 2012238621 A JP2012238621 A JP 2012238621A
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- 239000010457 zeolite Substances 0.000 description 1
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Abstract
【解決手段】 熱可塑性樹脂を主成分とし、かつ150℃における熱収縮率が10%以上の樹脂多孔質膜と、前記樹脂多孔質膜表面に形成されてなり、耐熱性微粒子を80体積%以上含有する耐熱多孔質層とを有し、前記耐熱多孔質層は、有機バインダを更に含有しており、150℃の恒温槽に3時間放置した時の全体の熱収縮率が5%以下であることを特徴とする非水電解質電池用セパレータ、および該セパレータを有する非水電解質電池により、前記課題を解決する。前記非水電解質電池用セパレータにおいては、樹脂多孔質膜の厚みA(μm)と耐熱多孔質層の厚みB(μm)との比A/Bが、1〜5であることが好ましい。
【選択図】 なし
Description
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。
b=(P/100)・a・σ・R/1 (2)
ここで、P:セパレータの空孔率(%)、a:セパレータの面積(cm2)、σ:電解液の導電率(S/cm)、R:セパレータ1枚あたりの抵抗(Ω)、l:セパレータの厚み(μm)である。
F3SO3、LiCF3CO2、Li2C2F4(SO3)2、LiN(CF3SO2)2、LiC(CF3SO2)3、LiCnF2n+1SO3(n≧2)、LiN(RfOSO2)2〔ここでRfはフルオロアルキル基〕などの有機リチウム塩などを用いることができる。
有機バインダであるPVDFのN−メチル−2−ピロリドン(NMP)溶液(固形分比率15質量%):600gと、NMP:1000gとを容器に入れ、均一に溶解するまで室温で攪拌した。この溶液に耐熱性微粒子であるアルミナ粉末(平均粒径0.4μm):3000gを4回に分けて加え、ディスパーにより2800rpmで1時間攪拌して均一なスラリーを調製した。ポリエチレン製多孔質膜(厚み12μm、空孔率40%、平均孔径0.4μm、150℃での熱収縮率68%)上に、前記のスラリーをナイフコーターによって塗布し、乾燥して耐熱多孔質層を形成することで、厚みが20μmのセパレータを得た。このセパレータの耐熱多孔質層における耐熱性微粒子の体積比率は88体積%、耐熱多孔質層の空孔率は51%であった。
有機バインダであるSBRのエマルジョン(固形分比率40質量%):100gと、水:4000gとを容器に入れ、均一に分散するまで室温で攪拌した。この分散液に耐熱性微粒子であるベーマイト粉末(板状、平均粒径1μm、アスペクト比10):4000gを4回に分けて加え、ディスパーにより2800rpmで5時間攪拌して均一なスラリーを調製した。ポリエチレン製多孔質膜(厚み16μm、空孔率40%、平均孔径0.4μm)上に、前記のスラリーをマイクログラビアコーターによって塗布し、乾燥して耐熱多孔質層を形成することで、厚みが20μmのセパレータを得た。このセパレータの耐熱多孔質層における耐熱性微粒子の体積比率は91体積%、耐熱多孔質層の空孔率は48%であった。
有機バインダである自己架橋型アクリル樹脂のエマルジョン(固形分比率40質量%):200gと、水:4000gとを容器に入れ、均一に分散するまで室温で攪拌した。この分散液に耐熱性微粒子であるベーマイト粉末(二次粒子状、二次粒子の平均粒径0.6μm、):4000gを4回に分けて加え、ディスパーにより2800rpmで5時間攪拌して均一なスラリーを調製した。ポリエチレン製多孔質膜(厚み16μm、空孔率40%、平均孔径0.4μm)上に、前記のスラリーをマイクログラビアコーターによって塗布し、乾燥して耐熱多孔質層を形成することで、厚みが20μmのセパレータを得た。このセパレータの耐熱多孔質層における耐熱性微粒子の体積比率は82体積%、耐熱多孔質層の空孔率は46%であった。
耐熱性微粒子を、ベーマイト粉末に代えて架橋アクリル樹脂微粒子(平均粒径0.4μm):4000gとした以外は、実施例3と同様にしてセパレータを作製した。このセパレータの耐熱多孔質層における耐熱性微粒子の体積比率は94体積%、耐熱多孔質層の空孔率は49%であった。
実施例2〜4のセパレータに用いたポリエチレン製多孔質膜のみを比較例1として用いた。
<正極の作製>
正極活物質であるLiCoO2:90質量部、導電助剤であるアセチレンブラック:7質量部、およびバインダであるPVDF:3質量部を、NMPを溶剤として均一になるように混合し、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さ15μmのアルミニウム箔の両面に、活物質塗布長が表280mm、裏面210mm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になるように正極活物質含有層の厚みを調整し、幅43mmになるように切断して正極を作製した。その後、正極におけるアルミニウム箔の露出部にタブ付けを行った。
負極活物質である黒鉛:95質量部とPVDF:5質量部とを、NMPを溶剤として均一になるように混合して負極合剤含有ペーストを調製した。このペーストを銅箔からなる厚さ10μmの集電体の両面に、活物質塗布長が表290mm、裏面230mm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142μmになるように負極活物質含有層の厚みを調整し、幅45mmになるように切断して負極を作製した。その後、負極における銅箔の露出部にタブ付けを行った。
前記のようにして得た正極と負極とを、実施例1のセパレータを樹脂多孔質膜が負極側に向くように介在させつつ重ね、渦巻状に巻回して巻回体電極群を作製した。得られた巻回体電極群を押しつぶして扁平状にし、厚み4mm、高さ50mm、幅34mmのアルミニウム製外装缶に入れ、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体積比で1対2に混合した溶媒にLiPF6を濃度1.2mol/lで溶解したもの)を注入した後に封止を行って、非水電解質電池を作製した。
セパレータを実施例2〜4または比較例1のものに変更した以外は、実施例5と同様にして非水電解質電池を作製した。
Claims (5)
- 熱可塑性樹脂を主成分とし、かつ150℃における熱収縮率が10%以上の樹脂多孔質膜と、前記樹脂多孔質膜表面に形成されてなり、耐熱性微粒子を80体積%以上含有する耐熱多孔質層とを有し、
前記耐熱多孔質層は、有機バインダを更に含有しており、
150℃の恒温槽に3時間放置した時の全体の熱収縮率が5%以下であることを特徴とする非水電解質電池用セパレータ。 - 耐熱多孔質膜の厚みは、6μm以下である請求項1に記載の非水電解質電池用セパレータ。
- 樹脂多孔質膜の厚みA(μm)と耐熱多孔質層の厚みB(μm)との比A/Bが、1〜5である請求項1に記載の非水電解質電池用セパレータ。
- 耐熱多孔質層が含有する有機バインダは、エチレン−酢酸ビニル共重合体であって酢酸ビニル由来の構造単位が20〜35モル%のもの、エチレン−アクリル酸共重合体、フッ素樹脂、フッ素系ゴム、スチレン−ブタジエンゴム、カルボキシメチルセルロース、ヒドロキシエチルセルロース、ポリビニルアルコール、ポリビニルブチラール、ポリビニルピロリドン、ポリN−ビニルアセトアミド、架橋アクリル樹脂、ポリウレタン、およびエポキシ樹脂から選ばれる少なくとも1種を含む請求項1に記載の非水電解質電池用セパレータ。
- 請求項1〜4のいずれかに記載の非水電解質電池用セパレータを有することを特徴とする非水電解質電池。
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KR101105748B1 (ko) | 2012-01-17 |
JP5477985B2 (ja) | 2014-04-23 |
KR101166091B1 (ko) | 2012-07-23 |
CN101218695A (zh) | 2008-07-09 |
CN102244220A (zh) | 2011-11-16 |
CN102244221A (zh) | 2011-11-16 |
JP2008305783A (ja) | 2008-12-18 |
KR20110079744A (ko) | 2011-07-07 |
JP4151852B2 (ja) | 2008-09-17 |
WO2007066768A1 (ja) | 2007-06-14 |
JP5038186B2 (ja) | 2012-10-03 |
EP1965454A4 (en) | 2011-10-05 |
JPWO2007066768A1 (ja) | 2009-05-21 |
EP1965454B1 (en) | 2019-12-25 |
JP2013008690A (ja) | 2013-01-10 |
KR20080073371A (ko) | 2008-08-08 |
US8405957B2 (en) | 2013-03-26 |
EP1965454A1 (en) | 2008-09-03 |
US20090067119A1 (en) | 2009-03-12 |
CN101218695B (zh) | 2011-07-20 |
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