JP2011528843A - 多孔性コーティング層を備えたセパレータ及びこれを備えた電気化学素子 - Google Patents
多孔性コーティング層を備えたセパレータ及びこれを備えた電気化学素子 Download PDFInfo
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- JP2011528843A JP2011528843A JP2011518670A JP2011518670A JP2011528843A JP 2011528843 A JP2011528843 A JP 2011528843A JP 2011518670 A JP2011518670 A JP 2011518670A JP 2011518670 A JP2011518670 A JP 2011518670A JP 2011528843 A JP2011528843 A JP 2011528843A
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Abstract
Description
セパレータの製造
PVdF‐CTFE(ポリビニリデンフルオライド‐co‐クロロトリフルオロエチレン共重合体)及びシアノエチルプルランを10:2の重量比でそれぞれアセトンに添加し、50℃で約12時間以上溶解させてバインダー高分子溶液を製造した。
アノード活物質として炭素粉末、結合剤としてポリビニリデンフルオライド(PVdF)、導電材としてカーボンブラックをそれぞれ96重量%、3重量%、1重量%にして、溶剤であるN‐メチル‐2‐ピロリドン(NMP)に添加してアノード活物質スラリーを製造した。前記アノード混合物スラリーを、厚さが10μmであるアノード集電体である銅(Cu)薄膜に塗布、乾燥してアノードを製造した後、ロールプレスを行った。
カソード活物質としてリチウムコバルト複合酸化物92重量%、導電材としてカーボンブラック4重量%、結合剤としてPVdF4重量%を溶剤であるN‐メチル‐2‐ピロリドン(NMP)に添加してカソード混合物スラリーを製造した。前記カソード混合物スラリーを、厚さが20μmであるカソード集電体であるアルミニウム(Al)薄膜に塗布、乾燥してカソードを製造した後、ロールプレスを行った。
以上製造された電極及びセパレータを利用して電池を製造した。
導電性PTC粒子の代わりにBaTiO3粉末を100%使ったことを除いては、実施例と同一の方法でセパレータ及び電池を製造した。
実施例及び比較例に従って製造したセパレータに対して下記方法によってシャットダウン性能を測定しその結果を図1に示した。
実施例及び比較例に従って製造した電池に対してセル性能を測定しその結果を図2に示した。
実施例及び比較例に従って製造した電池に対して下記方法によって安全性テスト(4.25Vで釘直径:2.5mm、貫通速度5m/minで釘刺し試験)を実施しその結果をそれぞれ図3及び図4に示した。
Claims (20)
- セパレータであって、
複数の気孔を有する平面状の不織布基材と、及び前記不織布基材の少なくとも一面に設けられており複数のフィラー粒子及びバインダー高分子の混合物で形成された多孔性コーティング層とを備えてなり、
前記フィラー粒子が、
前記不織布基材の融点より低い融点を有する低融点樹脂と複数の導電材粒子との混合物を含有する導電性PTC粒子を含んでなる、セパレータ。 - 前記導電性PTC粒子の含量が、フィラー粒子の全体重量を基準にして1ないし100重量%である、請求項1に記載のセパレータ。
- 前記複数の導電材粒子が、天然黒鉛、人造黒鉛、カーボンブラック及びグラファイトからなる群より選択された少なくとも何れか一つの炭素質粒子である、請求項1に記載のセパレータ。
- 前記フィラー粒子の平均粒径が、0.001ないし10μmである、請求項1に記載のセパレータ。
- 前記導電材粒子と低融点樹脂との重量比が50:50ないし90:10である、請求項1に記載のセパレータ。
- 前記フィラー粒子が、無機物粒子を含んでなる、請求項1に記載のセパレータ。
- 前記無機物粒子の含量が、フィラー粒子の全体重量を基準にして50重量%以上である、請求項6に記載のセパレータ。
- 前記低融点樹脂の融点が、80ないし130℃である、請求項1に記載のセパレータ。
- 前記低融点樹脂が、ポリオレフィン系樹脂である、請求項1に記載のセパレータ。
- 前記フィラー粒子とバインダー高分子との重量比が50:50ないし99:1である、請求項1に記載のセパレータ。
- 前記バインダー高分子が、溶解度指数が15ないし45MPa1/2である、請求項1に記載のセパレータ。
- 前記バインダー高分子が、ポリビニリデンフルオライド‐ヘキサフルオロプロピレン、ポリビニリデンフルオライド‐クロロトリフルオロエチレン、ポリメチルメタクリレート、ポリアクリロニトリル、ポリビニルピロリドン、ポリビニルアセテート、エチレンビニルアセテート共重合体、ポリエチレンオキサイド、セルロースアセテート、セルロースアセテートブチレート、セルロースアセテートプロピオネート、シアノエチルプルラン、シアノエチルポリビニルアルコール、シアノエチルセルロース、シアノエチルスクロース、プルラン及びカルボキシルメチルセルロースからなる群より選択された何れか一種のバインダー高分子またはこれらの二種以上の混合物である、請求項1に記載のセパレータ。
- 前記不織布基材が、その平均太さが0.5ないし10μmである極細糸で形成されたものである、請求項1に記載のセパレータ。
- 前記極細糸の溶融温度が、200℃以上である、請求項13に記載のセパレータ。
- 前記不織布基材が、
気孔の長径が0.1ないし70μmである気孔を、全体気孔数を基準にして50%以上含んでなる、請求項13に記載のセパレータ。 - 前記極細糸が、ポリエステル、ポリアセタール、ポリアミド、ポリカーボネート、ポリイミド、ポリエーテルエーテルケトン、ポリエーテルスルホン、ポリフェニレンオキサイド、ポリフェニレンスルフィドロ及びポリエチレンナフタレンからなる群より選択された何れか一種の高分子またはこれらの二種以上の混合物で形成されてなる、請求項13に記載のセパレータ。
- 前記不織布基材の厚さが、9ないし30μmである、請求項1に記載のセパレータ。
- 前記不織布基材に対する多孔性コーティング層のローディング量が5ないし20g/m2である、請求項1に記載のセパレータ。
- 電気化学素子であって、
カソードと、アノードと、及び前記カソードとアノードとの間に介されたセパレータを備えてなるものであり、
前記セパレータが請求項1〜18の何れか一項に記載のセパレータである、電気化学素子。 - 前記電気化学素子が、リチウム二次電池である、請求項19に記載の電気化学素子。
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Also Published As
Publication number | Publication date |
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PL2378592T3 (pl) | 2020-09-21 |
EP2378592A4 (en) | 2012-12-19 |
EP2378592A2 (en) | 2011-10-19 |
WO2010076989A2 (ko) | 2010-07-08 |
CN102272977B (zh) | 2014-03-12 |
WO2010076989A3 (ko) | 2010-08-26 |
KR20100080372A (ko) | 2010-07-08 |
US8703323B2 (en) | 2014-04-22 |
CN102272977A (zh) | 2011-12-07 |
JP5405568B2 (ja) | 2014-02-05 |
US20110256443A1 (en) | 2011-10-20 |
KR101091228B1 (ko) | 2011-12-07 |
EP2378592B1 (en) | 2020-02-05 |
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