JP2019530173A - 二次電池分離膜内の水分含量測定方法 - Google Patents
二次電池分離膜内の水分含量測定方法 Download PDFInfo
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Abstract
Description
10gのテトラヒドロフラン(THF)を50mlのメスフラスコ(volumetric flask)に入れ、ジメチルホルムアミド(DMF)をフラスコの表示線まで入れた。前記メスフラスコで5mlの溶液を新たな50mlのメスフラスコに入れ、ジメチルホルムアミド(DMF)をフラスコの表示線まで入れて、内部標準溶液を製造した。
3g、6g及び9gの水をそれぞれ50mlのメスフラスコに入れ、ジメチルホルムアミド(DMF)をそれぞれのフラスコの表示線まで入れた。前記メスフラスコでそれぞれ5mlの溶液を取り出して、それぞれ新たな50mlのメスフラスコに入れ、ジメチルホルムアミド(DMF)をそれぞれのフラスコの表示線まで入れた。製造された溶液をそれぞれ20mlのヘッドスペースサンプラー用バイアル(vial)に入れ、クランプ(clamp)を用いて隔壁(septum)とキャップ(cap)とを密封した。該密封されたバイアルにマイクロシリンジ(microsyringe)を用いて、5μLの内部標準溶液を注入して、標準試料を製造した。
試験試料の製造のために、ポリエチレン樹脂(PE)にAl2O3をフッ化ポリビニリデン(PVDF)バインダーと共にスラリー状態でコーティングした後、乾燥させたSRS分離膜を準備した。1gのSRS分離膜を20mlのヘッドスペースサンプラー用バイアルに入れ、ジメチルホルムアミド(DMF)を満たした。前記バイアルをクランプを用いて隔壁とキャップとを密封した。該密封されたバイアルにマイクロシリンジを用いて、5μLの内部標準溶液を注入して、試験試料を製造した。
標準試料及び試験試料をヘッドスペースサンプラー(Agilent社の7694 headspace sampler使用)及びガスクロマトグラフィー/熱伝導度検出器(GC/TCD)(Agilent社の6890 GC system使用)を用いて分析した。ここで、ヘッドスペースサンプラー及びGC/TCDは、下記のような条件下に使用した。標準試料の分析結果値を通じて検量線を作成して、図1に示した。図1の検量線を用いて試験試料内の水分含量を測定し、図2のGC−TCDクロマトグラムを通じて測定された水分含量を検証した。実施例1による試験試料内の水分含量は、802.3ppmで測定された。
Vial temperature:150℃
Loop temperature:160℃
Transfer line temperature:160℃
Equilibrium time:30min
Pressurizing time:1min
Loop fill time:0.25min
Injection time:0.5min
Vial pressure:6.5psi
Column:Rtx−5(30m×0.53mm I.D.×1.2m(フィルム厚さ))
Injector temperature:250℃
Oven temperature:50℃/0min−30℃/min−200℃/min
Detector temperature:250℃
Flow:4ml(He)
Split ratio:1/5
Injection volume:1μL
Analysis time:6min
実施例1で使われた1gのSRS分離膜を100℃に加熱し、この際、発生する水分をカールフィッシャー滴定法を使用して測定した。比較例1によるSRS分離膜内の水分含量は、590ppmで測定された。比較例1のカールフィッシャー滴定法を使用して水分含量を測定する場合、実施例1の方法を使用して水分含量を測定する場合に比べて、約26.5%程度水分含量が少なく測定されることを確認することができた。
実施例1で使われたSRS分離膜の代わりに、ポリエチレン樹脂(PE)にAl2O3と少量のBaTiO3とを混合した混合物をフッ化ポリビニリデン(PVDF)バインダーと共にスラリー状態でコーティングした後、乾燥させたSRS分離膜を準備した。それを除いては、実施例1と同じ方法で実験が進められた。実施例2による試験試料内の水分含量は、769.0ppmで測定された。
実施例2で使われたSRS分離膜を比較例1で使われたカールフィッシャー滴定法を使用して水分含量を測定した。比較例2によるSRS分離膜内の水分含量は、575ppmで測定された。比較例2のカールフィッシャー滴定法を使用して水分含量を測定する場合、実施例2の方法を使用して水分含量を測定する場合に比べて、約25.2%程度水分含量が少なく測定されることを確認することができる。
実施例1と同じ構成であって、ポリエチレン樹脂(PE)にAl2O3をフッ化ポリビニリデン(PVDF)バインダーと共にスラリー状態でコーティングした後、乾燥させたSRS分離膜を準備した。バイアルの加熱温度及び経時的な分離膜内の水分含量を測定するために、加熱温度及び時間を除いては、実施例1と同じ方法で実験が進められた。これにより、測定された水分の含量を下記表1に示した。
Claims (11)
- ヘッドスペースサンプラーを備えたガスクロマトグラフィーを用いる二次電池分離膜内の水分含量測定方法。
- 前記二次電池分離膜は、ポリオレフィン基材上に無機物粒子及びバインダー高分子がコーティングされたSRS分離膜である請求項1に記載の二次電池分離膜内の水分含量測定方法。
- 前記ポリオレフィン基材は、ポリエチレンまたはポリプロピレンである請求項2に記載の二次電池分離膜内の水分含量測定方法。
- 前記無機物粒子は、Al2O3、BaTiO3、BaSO4、TiO2またはこれらの組合わせである請求項2または3に記載の二次電池分離膜内の水分含量測定方法。
- 前記バインダー高分子は、フッ化ポリビニリデン(PVDF)を含む高分子物質である請求項2から4のいずれか一項に記載の二次電池分離膜内の水分含量測定方法。
- 前記二次電池分離膜内の水分含量測定方法は、
(a)内部標準物質に溶媒を混合して内部標準溶液を製造する段階と、
(b)水に溶媒を混合した後、(a)段階の内部標準溶液を投入して標準試料を製造する段階と、
(c)二次電池分離膜サンプルに溶媒を混合した後、(a)段階の内部標準溶液を投入して試験試料を製造する段階と、
(d)ヘッドスペースサンプラーを備えたガスクロマトグラフィーを用いて、(b)段階の標準試料及び(c)段階の試験試料の水分含量を測定する段階と、
を含む請求項1から5のいずれか一項に記載の二次電池分離膜内の水分含量測定方法。 - 前記内部標準物質は、テトラヒドロフラン(THF)であり、前記溶媒は、ジメチルホルムアミド(DMF)である請求項6に記載の二次電池分離膜内の水分含量測定方法。
- 前記内部標準溶液でテトラヒドロフラン(THF)の濃度は、1〜500mg/mlである請求項7に記載の二次電池分離膜内の水分含量測定方法。
- 前記標準試料及び試験試料に投入される内部標準溶液の量は、測定されるそれぞれの標準試料及び試験試料を基準に0.1〜0.5μL/mlである請求項6から8のいずれか一項に記載の二次電池分離膜内の水分含量測定方法。
- 前記ヘッドスペースサンプラーは、前記標準試料及び試験試料をそれぞれ投入するための容器を含み、140〜160℃の容器の温度で使われる請求項6から9のいずれか一項に記載の二次電池分離膜内の水分含量測定方法。
- 前記ガスクロマトグラフィーは、検出器として熱伝導度検出器を使用する請求項6から10のいずれか一項に記載の二次電池分離膜内の水分含量測定方法。
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| Publication number | Publication date |
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| CN109863640B (zh) | 2022-02-22 |
| WO2018135777A1 (ko) | 2018-07-26 |
| KR20180085995A (ko) | 2018-07-30 |
| JP6791473B2 (ja) | 2020-11-25 |
| KR102020706B1 (ko) | 2019-09-11 |
| US20190250132A1 (en) | 2019-08-15 |
| US11480552B2 (en) | 2022-10-25 |
| CN109863640A (zh) | 2019-06-07 |
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