JP2016517161A - 熱伝導率を高めたナノ多孔質複合セパレータ - Google Patents
熱伝導率を高めたナノ多孔質複合セパレータ Download PDFInfo
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Abstract
Description
多孔質セパレータは、アノードとカソードの物理的な接触の防止しながら必要に応じて電気化学エネルギー供給のためのイオン輸送を促進することをを含む、電池設計の重要な役割を担う。大型リチウムイオン電池は、平均温度20度から70度で動作しうる。しかしながら、電池充電および/または放電におけるスパイクは、そのような電池の短期温度を110度以上に押し上げる可能性がある。リチウムイオン電池に使用されるセパレータは、一般的に、そのような高温においてはとりわけ化学分解のために縮みうるおよび/または溶けうるポリプロピレンまたはポリエチレンなどの、ポリオレフィンのセパレータである。これらのプラスチックセパレータは、電池の電極を互いから絶縁するのに必要な導電性が低いが、プラスチックセパレータはまた、熱伝導率も非常に低く、したがって、電池内の熱を放熱するのが遅く、効率が悪い。リチウムイオン電池は、電気および/またはハイブリット自動車のような高容量のアプリケーションにますます利用されており、これらの電池は大型でパワーレートが高いので、安全性の向上の必要性は非常に高まっている。場合によっては、電池セパレータは、電池性能および安全性を確保するために、200度以上の温度で寸法安定性(すなわちセパレータ材料の収縮率が5.0%より少ない)を維持することが求められうる。ポリオレフィンセパレータをセラミック基材料で被覆すること、および/または高融点のポリマー基材料(ポリエチレンテレフタレート、ポリアミド、ポリフッ化ビニリデンなど)を選択することは、熱安定性/電池故障温度を幾分上げうるが、そのような技術はコストを上げ、セル全体への速く、効率的で、均一な熱伝導という基本的なセパレータ設計事項に取り組み損ねる。
図1、図2は、赤外線カメラ(FLIRモデル8300)を用いて作製された、高分子セパレータおよび本開示の実施形態によって作製されたベーマイト基セパレータのサーモグラムを示す。図1は、加熱したステンレス鋼基板にさらした際のポリエチレンセパレータフィルムのサーモグラムである。一方、図2は、加熱したステンレス鋼基板に同様にさらした同じ厚さのベーマイト基セパレータフィルムのサーモグラムである。図1の明るいパッチ101は、熱集中が増加した領域に相当する。一方、暗いパッチ103は、熱集中が減少した領域に相当する。図2のベーマイト基セパレータで観察される均一な熱分布は、プラスチックセパレータに見られるムラのある熱分布と比べて明らかである。
Claims (28)
- セラミック粒子と、
多孔質バインダーと、を備え、
前記多孔質セパレータは、多孔率が35%から50%で、平均孔径が10nmから50nmである、多孔質電池セパレータ。 - 200度の温度に少なくとも一時間さらされた場合に1%より少ない収縮率を呈する、請求項1に記載ぼの多孔質セパレータ。
- 前記セラミック粒子は、無機酸化物粒子および無機窒化物粒子からなるグループから選択される、請求項1または請求項2に記載の多孔質セパレータ。
- 前記セラミック粒子は、Al2O3(アルミナ)、AlO(OH)またはベーマイト、AlN(窒化アルミニウム)、BN(窒化硼素)、SiN(窒化ケイ素)、ZnO(酸化亜鉛)、ZrO2(ジルコニア)、SiO2(シリカ)およびそれらの組み合わせのうち少なくとも一つを備える、請求項1から請求項3のいずれか一項に記載の多孔質セパレータ。
- 前記セラミック粒子は、65%から95%のベーマイトおよび残りのBN(窒化硼素)を備える、請求項1から請求項4のいずれか一項に記載の多孔質セパレータ。
- 前記セラミック粒子は、65%から95%のベーマイトおよび残りのAlN(窒化アルミニウム)を備える、請求項1から請求項4のいずれか一項に記載の多孔質セパレータ。
- 前記平均孔径は、10nmから90nmである、請求項1に記載の多孔質セパレータ。
- 1%より少ない細孔が、10nmから90nm以外の孔径を有する、請求項1に記載の多孔質セパレータ。
- 前記多孔率は、35%から50%である、請求項1に記載の多孔質セパレータ。
- 前記多孔質バインダーは、二フッ化ポリ塩化ビニリデン(PVdF)およびそのコポリマー、ポリビニルエーテル、ウレタン、アクリル、セルロース、スチレン−ブタジエンコポリマー、天然ゴム、キトサン、ニトリルゴム、シリコーンエラストマー、PEO(ポリエチレンオキシド)またはPEO(ポリエチレンオキシド)コポリマー、ポリホスファゼン、およびそれらの組み合わせから選択されるポリマーを備える、請求項1に記載の多孔質セパレータ。
- 温度が25度から50度に上昇すると高まり、ASTM E1461およびASTM 1530のうち一つを用いて試験される、熱伝導率を有する、請求項1に記載の多孔質セパレータ。
- 細孔容積を有し、前記細孔容積の90%より多くが、孔径が100nmより小さい細孔を備える、請求項1に記載の多孔質セパレータ。
- アノードと、
カソードと、
リチウム塩を備える無機電解質と、
有機ポリマーおよびセラミック材料を備える多孔質セパレータ層と、を備える電気化学セルであって、
前記多孔質セパレータ層は、多孔率が35%から50%で、平均孔径は10nmから90nmであり、200度の温度に少なくとも一時間さらされた場合に1%より少ない収縮率を呈する、電気化学セル。 - 前記無機セラミック粒子は、無機酸化物粒子および無機窒化物粒子からなるグループから選択される、請求項13に記載の電気化学セル。
- 前記セラミック材料は、Al2O3(アルミナ)、AlO(OH)またはベーマイト、AlN(窒化アルミニウム)、BN(窒化硼素)、SiN(窒化ケイ素)、ZnO(酸化亜鉛)、ZrO2(ジルコニア)、SiO2(シリカ)、およびそれらの組み合わせを備え、前記有機ポリマーは、PVdF(二フッ化ポリ塩化ビニリデン)およびそのコポリマー、ポリビニルエーテル、ウレタン、アクリル、セルロース、スチレン−ブタジエンコポリマー、天然ゴム、キトサン、ニトリルゴム、シリコーンエラストマー、PEO(ポリエチレンオキシド)またはPEO(ポリエチレンオキシド)コポリマー、ポリホスファゼン、およびそれらの組み合わせを備える、請求項14に記載の電気化学セル。
- 前記平均孔径は、25nmから35nmである、請求項13に記載の電気化学セル。
- 前記多孔率は、40%から45%である、請求項13に記載の電気化学セル。
- 可撓性多孔質複合セパレータを製造する方法であって、
有機高分子材料と、無機セラミック材料と、溶剤とを含む分散液を調合することと、
前記分散液を基板に付与して被膜を形成することと、
前記被膜を乾燥して硬化させることと、
前記被膜を前記基板から取り除き、それによって可撓性多孔質複合セパレータを形成することと、を備え、
前記多孔質セパレータは、多孔率が35%から50%で、平均孔径は10nmから50nmであり、200度の温度に少なくとも一時間さらされた場合に1%より少ない収縮率を呈する、方法。 - 前記平均孔径は20nmから40nmであり、前記多孔質複合セパレータの多孔率は40%から45%である、請求項18に記載の方法。
- 前記無機セラミック材料は、ベーマイト、BN(窒化硼素)、AlN(窒化アルミニウム)のうち少なくとも一つを備える、請求項18に記載の方法。
- 電池を介して熱を伝導する方法であって、前記方法は、
リチウムイオン電池の電極の温度を上昇させることと、
多孔質セラミック粒子およびポリマーを備えるセパレータを介して熱を前記電極から第二電極に伝導することと、を備え、
前記セパレータは、多孔率が35%から50%で、平均孔径は10nmから50nmである、方法。 - 前記平均孔径は、20nmから40nmである、請求項21に記載の方法。
- 前記セパレータは複数の細孔を有し、前記細孔のそれぞれの直径は10nmから50nmである、請求項21に記載の方法。
- 前記セパレータは複数の細孔を有し、1%または0.1%より少ない前記細孔は、直径が100nmより大きい、請求項21に記載の方法。
- 前記セパレータは、多孔率が40%から45%である、請求項21に記載の方法。
- 前記セパレータは、200度の温度に少なくとも一時間さらされた場合に、1%より少ない収縮率を呈する、請求項21に記載の方法。
- 可撓性複合セラミックセパレータであって、
ポリマーと、
前記ポリマーに均一に分散した第一無機粒子材料と、
前記ポリマーに均一に分散した、粒径または組成のどちらかが前記第一無機粒子材料と異なる第二無機粒子材料と、を備え、
前記第一無機粒子材料と前記第二無機粒子材料の負荷の合計と同じ負荷重量において単一の無機粒子材料のみを含むという点のみが異なる、同じ組成の比較複合セラミックセパレータの熱伝導率よりも高い熱伝導率を呈する、可撓性複合セラミックセパレータ。 - 前記比較複合セラミックセパレータの前記単一の無機粒子は、前記可撓性複合セラミックセパレータの前記無機粒子材料の一つと同じである、請求項27に記載の可撓性複合セラミックセパレータ。
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WO2023090449A1 (ja) * | 2021-11-22 | 2023-05-25 | 国立研究開発法人産業技術総合研究所 | 可撓性全固体電池及びその製造方法 |
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US20200343507A1 (en) | 2020-10-29 |
KR20160003137A (ko) | 2016-01-08 |
US20220352598A1 (en) | 2022-11-03 |
KR102236436B1 (ko) | 2021-04-06 |
US11387521B2 (en) | 2022-07-12 |
KR102513159B1 (ko) | 2023-03-23 |
US11217859B2 (en) | 2022-01-04 |
CN110591131A (zh) | 2019-12-20 |
JP7126281B2 (ja) | 2022-08-26 |
KR20210105445A (ko) | 2021-08-26 |
KR102294032B1 (ko) | 2021-08-27 |
JP2021122026A (ja) | 2021-08-26 |
KR20220137780A (ko) | 2022-10-12 |
WO2014179355A1 (en) | 2014-11-06 |
US20160104876A1 (en) | 2016-04-14 |
CN110591131B (zh) | 2023-01-24 |
JP7267630B2 (ja) | 2023-05-02 |
US10879513B2 (en) | 2020-12-29 |
DE112014002202T5 (de) | 2016-04-14 |
US20220123434A1 (en) | 2022-04-21 |
JP2021093379A (ja) | 2021-06-17 |
CN105247703A (zh) | 2016-01-13 |
KR102448882B1 (ko) | 2022-09-28 |
JP2023080287A (ja) | 2023-06-08 |
KR20210038696A (ko) | 2021-04-07 |
CN105247703B (zh) | 2019-09-03 |
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