JP2014160665A - セパレータの製造方法、その方法によって形成されたセパレータ、及びそれを含む電気化学素子の製造方法 - Google Patents
セパレータの製造方法、その方法によって形成されたセパレータ、及びそれを含む電気化学素子の製造方法 Download PDFInfo
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- JP2014160665A JP2014160665A JP2014080415A JP2014080415A JP2014160665A JP 2014160665 A JP2014160665 A JP 2014160665A JP 2014080415 A JP2014080415 A JP 2014080415A JP 2014080415 A JP2014080415 A JP 2014080415A JP 2014160665 A JP2014160665 A JP 2014160665A
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Abstract
【解決手段】セパレータ製造方法が、(S1)多数の気孔を有する平面状の多孔性基材を用意する段階;(S2)無機物粒子が分散され、第1バインダー高分子及び第2バインダー高分子を含むバインダー高分子が溶媒に溶解されたスラリーを、第1吐出口を通して前記多孔性基材にコーティングしながら、前記第2バインダー高分子は溶解させない非溶媒を、前記第1吐出口と隣接する第2吐出口を通して前記多孔性基材にコーティングされたスラリー上に連続的にコーティングする段階;(S3)前記溶媒及び非溶媒を同時に乾燥処理する段階を含む。
【選択図】図1
Description
(S1)多数の気孔を有する平面状の多孔性基材を用意する段階;
(S2)無機物粒子が分散され、第1バインダー高分子及び第2バインダー高分子を含むバインダー高分子が溶媒に溶解されたスラリーを、第1吐出口を介して(通じて)前記多孔性基材にコーティングしながら、前記第2バインダー高分子は溶解させない非溶媒を、前記第1吐出口と隣接する第2吐出口を介して(通じて)前記多孔性基材にコーティングされたスラリー上に連続的にコーティングする段階;及び
(S3)前記溶媒及び非溶媒を同時に乾燥処理する段階を含む。
第1バインダー高分子であるシアノエチルプルラン及び第2バインダー高分子であるポリフッ化ビニリデン‐ヘキサフルオロプロピレン(PVdF‐HFP)を2:10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。製造された高分子溶液にチタン酸バリウム(BaTiO3)粉末を高分子混合物/活性炭素粉末=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で無機物粒子を破砕及び分散してスラリーを製造した。製造されたスラリーの無機物粒子の粒径は平均600nmであった。
非溶媒の種類を蒸留水とメタノールが5:5(v/v)で混合された混合非溶媒に変更したことを除き、実施例1と同様の方法でセパレータを製造した。得られたセパレータのガーレー値及び結着力は、それぞれ367.6sec/100mL及び9.81gf/cmであった。
第1バインダー高分子をシアノアクリレートに変更したことを除き、実施例1と同様の方法でセパレータを製造した。得られたセパレータのガリー値及び結着力はそれぞれ375.4sec/100mL及び13.94gf/cmであった。
第1バインダー高分子をアクリルアミド‐アクリレートの共重合体に変更したことを除き、実施例1と同様の方法でセパレータを製造した。得られたセパレータのガリー値及び結着力はそれぞれ349.1sec/100mL及び10.47gf/cmであった。
非溶媒である蒸留水をコーティングする代わりに溶媒であるアセトンをコーティングしたことを除き、実施例1と同様の方法で実施した。
Claims (20)
- セパレータの製造方法であって、
(S1)多数の気孔を有する平面状の多孔性基材を用意する段階と、
(S2)無機物粒子が分散され、第1バインダー高分子及び第2バインダー高分子を含むバインダー高分子を溶媒に溶解したスラリーを、第1吐出口を通じて前記多孔性基材にコーティングしながら、前記第2バインダー高分子を溶解しない非溶媒を、前記第1吐出口と隣接する第2吐出口を通じて前記多孔性基材にコーティングしたスラリー上に連続的にコーティングする段階と、
(S3)前記溶媒及び非溶媒を同時に乾燥処理する段階とを含んでなる、セパレータの製造方法。 - 前記多孔性基材が、ポリオレフィン系多孔性膜であることを特徴とする、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であることを特徴とする、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であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記無機物粒子が、誘電率定数が5以上の無機物粒子、リチウムイオン伝達能力を有する無機物粒子、及びこれらの混合物からなる群より選択された無機物粒子であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記誘電率定数が5以上の無機物粒子は、BaTiO3、Pb(Zr,Ti)O3(PZT)、Pb1−xLaxZr1−yTiyO3(PLZT、0<x<1、0<y<1)、Pb(Mg1/3Nb2/3)O3‐PbTiO3(PMN‐PT)、ハフニア(HfO2)、SrTiO3、SnO2、CeO2、MgO、NiO、CaO、ZnO、ZrO2、Y2O3、Al2O3、SiC及びTiO2からなる群より選択されたいずれか1つの無機物粒子またはこれらのうち2種以上の混合物であることを特徴とする、請求項5に記載のセパレータの製造方法。
- 前記リチウムイオン伝達能力を有する無機物粒子が、リチウムホスフェート(Li3PO4)、リチウムチタンホスフェート(LixTiy(PO4)3、0<x<2、0<y<3)、リチウムアルミニウムチタンホスフェート(LixAlyTiz(PO4)3、0<x<2、0<y<1、0<z<3)、(LiAlTiP)xOy系列ガラス(0<x<4、0<y<13)、リチウムランタンチタネート(LixLayTiO3、0<x<2、0<y<3)、リチウムゲルマニウムチオホスフェート(LixGeyPzSw、0<x<4、0<y<1、0<z<1、0<w<5)、リチウムナイトライド(LixNy、0<x<4、0<y<2)、SiS2系列ガラス(LixSiySz、0<x<3、0<y<2、0<z<4)、P2S5系列ガラス(LixPySz、0<x<3、0<y<3、0<z<7)からなる群より選択されたいずれか1つの無機物粒子またはこれらのうち2種以上の混合物であることを特徴とする、請求項5に記載のセパレータの製造方法。
- 前記第1バインダー高分子が、シアノ基を有する高分子であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記シアノ基を有する高分子が、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、シアノアクリレート、及びシアノエチルスクロースからなる群より選択されたいずれか1つまたはこれらのうち2種以上の混合物であることを特徴とする、請求項8に記載のセパレータの製造方法。
- 前記第1バインダー高分子が、ポリアクリルアミド‐アクリレートであることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記溶媒と前記第1バインダー高分子との溶解度指数差、及び前記溶媒と前記第2バインダー高分子との溶解度指数差が、それぞれ5.0MPa0.5以下であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記溶媒が、アセトン、N,N‐ジメチルアセトアミド、N,N‐ジメチルホルムアミド、N‐メチル‐2‐ピロリドン、及びメチルエチルケトンからなる群より選択されたいずれか1つまたはこれらのうち2種以上の混合物であることを特徴とする、請求項11に記載のセパレータの製造方法。
- 前記第2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、及びポリメチルメタクリレートからなる群より選択されたいずれか1つまたはこれらのうち2種以上の混合物であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 前記非溶媒と前記第2バインダー高分子との溶解度指数差が、8.0MPa0.5以上であることを特徴とする請求項1に記載のセパレータの製造方法。
- 前記非溶媒が、水、メタノール、及びエタノールからなる群より選択されたいずれか1つまたはこれらのうち2種以上の混合物であることを特徴とする、請求項14に記載のセパレータの製造方法。
- 前記第1バインダー高分子と第2バインダー高分子との重量比が、75:25ないし10:90であることを特徴とする、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であることを特徴とする、請求項1に記載のセパレータの製造方法。
- 請求項1〜17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。
- 電気化学素子の製造方法であって、
セパレータを製造し、正極と負極との間に前記セパレータを介在させてラミネートする段階を含んでなり、
前記セパレータを請求項1〜17の何れか一項によって製造することを特徴とする、電気化学素子の製造方法。 - 前記電気化学素子がリチウム二次電池であることを特徴とする、請求項19に記載の電気化学素子の製造方法。
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