JP2023500544A - 電気化学素子用分離膜及びそれを含む電気化学素子 - Google Patents
電気化学素子用分離膜及びそれを含む電気化学素子 Download PDFInfo
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Classifications
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- H—ELECTRICITY
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Abstract
Description
前記無機コーティング層の総100重量%に対して前記無機物粒子の重量が50重量%以上であり、
下記の数式1による比率(A)が70%以上である。
比率(A)(%)=[(圧縮前の最初絶縁破壊電圧-圧縮後の絶縁破壊電圧)/(圧縮前の最初絶縁破壊電圧)]×100
比率(A)(%)=[(圧縮前の最初絶縁破壊電圧-圧縮後の絶縁破壊電圧)/(圧縮前の最初絶縁破壊電圧)]×100
以下の方法によってそれぞれの実施例及び比較例の分離膜を製造した。
実施例1~6及び比較例1~3で製造された分離膜の表面特性、スラリー粒度及び絶縁破壊電圧をそれぞれ測定して下記の表1に示した。
ガーレー透気度値はASTM D726-94方法によって測定した。ここで使用されたガーレーは、空気の流れに対する抵抗であって、 ガーレー透気度試験機(Gurley densometer)によって測定される。ここで、ガーレー透気度値は100mlの空気が12.2 in H2Oの圧力下で1平方インチの断面を通過するのにかかる時間(秒)、すなわち通気時間を示す。
実施例及び比較例の各組成物において、複合粒子の粒度分布をマイクロトラック3000を用いて測定した。
FESEM-光学プロファイラーなどの測定機器(×100倍)を用いて各実施例及び比較例で用意した分離膜のうち無機コーティング層の表面を観察した。それぞれの分離膜は1.5×2cmの大きさで用意した。前記光学プロファイラーによる測定時に最大高さと最小高さとの差が最大である部分を基準にして2次粒子の高さを算出した。また、無機コーティング層の最小高さを無機コーティング層の表面部にし、突出した2次粒子の最長径を基準にして無機物粒子の直径を測定した。
各実施例及び比較例に対して分離膜試片を用意し、AC/DC/IRハイポットテスターで絶縁破壊電圧を測定した。
比率(A)(%)=[(圧縮前の最初絶縁破壊電圧-圧縮後の絶縁破壊電圧)/(圧縮前の最初絶縁破壊電圧)]×100
以下のように負極を用意した。負極活物質(グラファイト)、導電材(スーパーP)、バインダー(CMCとSBR(スチレンブタジェンゴム)との1:1(重量比)混合物)を97.5:1.5:1重量比(wt%)で溶媒(水)に投入し混合(2000rpm、30分)して負極スラリーを製造した。用意した負極スラリーを厚さ20μmの銅薄膜にドクターブレードを用いて塗布し、110℃で一晩乾燥した。正極の厚さは約100μm~110μmになるように調節され、圧着機(ロールプレス)を用いて最終的に約60μm~70μmになるようにプレス作業を行った。このように用意した電極を80℃の真空乾燥機で4時間維持した。次いで、各実施例及び比較例で収得した分離膜と前記負極とを積層して分離膜-負極積層体試片を用意した。それぞれの積層体試片を2.5cm×10cmの大きさで用意した。3M社製の両面テープをスライドガラスに貼り付けた後、各試片の分離膜面が両面テープと対面するように付着した。UTM条件としては10Nロードセル及び180゜モードを使用し、速度は300mm/分で行った。
Claims (13)
- 電気化学素子用分離膜であって、
多数の気孔を有する多孔性基材と、前記多孔性基材の少なくとも一面または両面に形成されており、多数の無機物粒子及び前記無機物粒子の表面の一部または全部に位置して前記無機物粒子同士の間を連結及び固定させるバインダー樹脂を含む多孔性の無機コーティング層と、を含み、
前記無機コーティング層の総100重量%に対して前記無機物粒子の重量が50重量%以上であり、
下記の数式1による比率(A)が70%以上である、電気化学素子用分離膜。
[数式1]
比率(A)(%)=[(圧縮前の最初絶縁破壊電圧-圧縮後の絶縁破壊電圧)/(圧縮前の最初絶縁破壊電圧)]×100
数式1において、前記圧縮前の最初絶縁破壊電圧は、分離膜にDC電流を印加して所定の速度で昇圧させる場合、短絡が発生する時点の電圧を意味し、前記圧縮後の絶縁破壊電圧は、分離膜を1MPa~10MPaの範囲で加圧しながらDC電流を印加して所定の速度で昇圧させる場合、短絡が発生する時点の電圧を意味する。 - 前記無機コーティング層の表面を観察したとき、2次粒子が存在しないか又は観察される2次粒子の直径が50μm以下であり、前記2次粒子は複数の1次粒子が集まって凝集された凝集体である、請求項1に記載の電気化学素子用分離膜。
- 前記無機コーティング層の表面を観察したとき、2次粒子が存在しないか、又は、観察される2次粒子の直径が50μm以下であって分離膜の表面から突出した高さが3μm以内であり、前記2次粒子は複数の1次粒子が集まって凝集された凝集体である、請求項1に記載の電気化学素子用分離膜。
- 前記分離膜と電極との接着力が15gf/25mm~200gf/25mmである、請求項1から3の何れか一項に記載の電気化学素子用分離膜。
- 前記バインダー樹脂は、フッ素系バインダー樹脂を含み、前記フッ素系バインダー樹脂は、ポリフッ化ビニリデンホモポリマー、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フッ化ビニリデン-クロロトリフルオロエチレンからなる群より選択されたいずれか一つまたはこれらうち2種以上の混合物を含む、請求項1から4の何れか一項に記載の電気化学素子用分離膜。
- 前記フッ素系バインダー樹脂の分子量が200,000~1,500,000である、請求項5に記載の電気化学素子用分離膜。
- 前記フッ素系バインダー樹脂がPVdF-HFPであり、HFPの置換度が3wt%~30wt%である、請求項6に記載の電気化学素子用分離膜。
- 正極、負極、前記正極と負極との間に介在された分離膜を含み、前記分離膜が請求項1から7のうちいずれか一項に記載の分離膜である、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8に記載の電気化学素子。
- 請求項1から7の何れか一項に記載の電気化学素子用分離膜を製造する方法であって、
溶媒、無機物粒子及びバインダー樹脂を含む無機コーティング層形成用組成物を製造する段階と、
前記組成物を多孔性基材の表面に塗布して乾燥する段階と、を含み、
前記組成物は、溶媒に無機物粒子及びバインダー樹脂を投入し撹拌して用意し、収得された前記組成物中の複合粒子は、粒径(D50)2.5μm以下及び粒径(D99)35μm以下のうち一つ以上の条件を満足し、前記複合粒子は、前記組成物中の無機物粒子及び/またはバインダー樹脂が凝集されて形成されたフロックである、電気化学素子用分離膜の製造方法。 - 前記バインダー樹脂は、フッ素系バインダー樹脂を含み、前記フッ素系バインダー樹脂は、ポリフッ化ビニリデンホモポリマー、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フッ化ビニリデン-クロロトリフルオロエチレンからなる群より選択されたいずれか一つまたはこれらうち2種以上の混合物を含む、請求項10に記載の電気化学素子用分離膜の製造方法。
- 前記フッ素系バインダー樹脂の分子量が200,000~1,500,000である、請求項11に記載の電気化学素子用分離膜の製造方法。
- 前記フッ素系バインダー樹脂がPVdF-HFPであり、HFPの置換度が3wt%~30wt%である、請求項12に記載の電気化学素子用分離膜の製造方法。
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US11658365B2 (en) * | 2018-01-30 | 2023-05-23 | Lg Energy Solution, Ltd. | Separator for electrochemical device and method for manufacturing the same |
KR20210060238A (ko) * | 2019-11-18 | 2021-05-26 | 주식회사 엘지에너지솔루션 | 전기화학소자용 분리막 및 이를 포함하는 전기화학소자 |
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- 2020-11-17 WO PCT/KR2020/016206 patent/WO2021101222A1/ko unknown
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KR20210061137A (ko) | 2021-05-27 |
JP7395213B2 (ja) | 2023-12-11 |
WO2021101222A1 (ko) | 2021-05-27 |
US20220393304A1 (en) | 2022-12-08 |
EP4050721A4 (en) | 2022-12-21 |
CN114651367A (zh) | 2022-06-21 |
EP4050721A1 (en) | 2022-08-31 |
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