JP2014500589A - セパレータの製造方法、その方法により形成したセパレータ、及びそれを備えた電気化学素子 - Google Patents
セパレータの製造方法、その方法により形成したセパレータ、及びそれを備えた電気化学素子 Download PDFInfo
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- JP2014500589A JP2014500589A JP2013539739A JP2013539739A JP2014500589A JP 2014500589 A JP2014500589 A JP 2014500589A JP 2013539739 A JP2013539739 A JP 2013539739A JP 2013539739 A JP2013539739 A JP 2013539739A JP 2014500589 A JP2014500589 A JP 2014500589A
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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Abstract
Description
(S1)気孔を有する多孔性基材を用意する段階と、
(S2)前記多孔性基材の少なくとも一面上に第1溶媒をコーティングする段階と、
(S3)無機物粒子が分散しており、バインダー高分子が第2溶媒に溶解されたスラリーを前記コーティングされた第1溶媒上にコーティングする段階と、
(S4)前記第1溶媒及び第2溶媒を同時に乾燥処理し、多孔性有機無機複合層を前記多孔性基材上に形成する段階と、を含む。
PVdF‐CTFE(ポリフッ化ビニリデン‐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高分子溶液を製造した。製造した高分子溶液に、Al2O3粉末とBaTiO3粉末とを9:1の重量比で混合した無機物粒子を高分子:無機物粒子が10:90の重量比になるように添加し、12時間以上ボールミル法を用いて無機物粒子を破砕及び分散することでスラリーを製造した。このように製造したスラリーの無機物粒子の粒径は平均600nmであった。
アセトンをコーティングせず、スラリーのみを図1に示されたスロットダイを通じてコーティングしたことを除き、実施例1と同様の方法でセパレータを完成した。スラリーのコーティング量は、最終的に形成される多孔性有機無機複合層の厚さが4umになるように調節した。
スロットダイコーティングの代わりに、ポリエチレン多孔性膜をスラリーにディップコーティング方式で両面コーティングしたことを除き、比較例1と同様の方法でセパレータを完成した。両面にそれぞれコーティングされたスラリーの量は最終的に形成される多孔性有機無機複合層の厚さがそれぞれ2um(両面厚さの和が4um)になるように調節した。
Claims (16)
- セパレータの製造方法であって、
(S1)気孔を有する多孔性基材を用意する段階と、
(S2)前記多孔性基材の少なくとも一面上に第1溶媒をコーティングする段階と、
(S3)無機物粒子が分散しており、バインダー高分子が第2溶媒に溶解されたスラリーを前記コーティングされた第1溶媒上にコーティングする段階と、
(S4)前記第1溶媒及び第2溶媒を同時に乾燥処理し、多孔性有機無機複合層を前記多孔性基材上に形成する段階とを含んでなる、セパレータの製造方法。 - 前記多孔性有機無機複合層のバインダー高分子が、前記無機物粒子の表面の一部または全体にコーティング層として存在してなり、
前記無機物粒子が、密着した状態で前記コーティング層によって相互連結及び固定されてなり、且つ、
前記無機物粒子同士の間に存在するインタースティシャル・ボリューム(interstitial volume)によって気孔が形成されてなる、請求項1に記載のセパレータの製造方法。 - 前記多孔性基材がポリオレフィン系多孔性膜である、請求項1に記載のセパレータの製造方法。
- 前記多孔性基材の厚さが1ないし100umである、請求項1に記載のセパレータの製造方法。
- 前記バインダー高分子の溶解度指数が15ないし45Mpa1/2である、請求項1に記載のセパレータの製造方法。
- 前記バインダー高分子が、ポリフッ化ビニリデン‐ヘキサフルオロプロピレン、ポリフッ化ビニリデン‐トリクロロエチレン、ポリメチルメタクリレート、ポリブチルアクリレート、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、ポリアリレート、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又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の製造方法。
- 前記第1溶媒及び前記第2溶媒が、それぞれ相互に独立して、アセトン、テトラヒドロフラン、メチレンクロライド、クロロホルム、ジメチルホルムアミド、N‐メチル‐2‐ピロリドン(NMP)、シクロヘキサン及び水からなる群より選択されたいずれか一種の溶媒又はこれらの二種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の製造方法。
- 前記第1溶媒及び前記第2溶媒が同じ溶媒である、請求項7に記載のセパレータの製造方法。
- 前記第1溶媒、前記第2溶媒及び前記バインダー高分子の相互間溶解度指数の差が、全て5.0Mpa1/2以下である、請求項1に記載のセパレータの製造方法。
- 前記第1溶媒の沸点が前記第2溶媒の沸点以上である、請求項1に記載のセパレータの製造方法。
- 前記無機物粒子の平均粒径が0.001ないし10umである、請求項1に記載のセパレータの製造方法。
- 前記無機物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の製造方法。
- 前記第1溶媒のコーティング厚さが10ないし250umである、請求項1に記載のセパレータの製造方法。
- 請求項1〜13の何れか一項に記載のセパレータの製造方法によって形成された、セパレータ。
- 正極と、負極と、前記正極と前記負極との間に介在するセパレータとを備えてなる、電気化学素子であって、
前記セパレータが、請求項1〜13の何れか一項に記載のセパレータの製造方法によって得られてなるものである、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15に記載の電気化学素子。
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JP2015140439A (ja) * | 2015-04-24 | 2015-08-03 | 住友化学株式会社 | 塗工液及び積層多孔質フィルム |
WO2022005213A1 (ko) * | 2020-07-01 | 2022-01-06 | 주식회사 엘지에너지솔루션 | 분리막의 제조방법, 제조장치 이에 의해 제조된 분리막 |
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US9954210B2 (en) | 2018-04-24 |
EP2750219A1 (en) | 2014-07-02 |
KR20140097193A (ko) | 2014-08-06 |
CN103181000A (zh) | 2013-06-26 |
EP2750219A4 (en) | 2015-04-01 |
CN103181000B (zh) | 2019-04-19 |
US20150380702A1 (en) | 2015-12-31 |
KR101708884B1 (ko) | 2017-02-21 |
JP5678201B2 (ja) | 2015-02-25 |
WO2013058421A1 (ko) | 2013-04-25 |
EP2750219B1 (en) | 2018-01-17 |
US20130101885A1 (en) | 2013-04-25 |
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