JP2012059393A - 非水電解液電池 - Google Patents
非水電解液電池 Download PDFInfo
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- JP2012059393A JP2012059393A JP2010198759A JP2010198759A JP2012059393A JP 2012059393 A JP2012059393 A JP 2012059393A JP 2010198759 A JP2010198759 A JP 2010198759A JP 2010198759 A JP2010198759 A JP 2010198759A JP 2012059393 A JP2012059393 A JP 2012059393A
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- flame retardant
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Abstract
【解決手段】リチウムイオン二次電池1は、活物質を含む正極合剤層が集電体に形成された正極板2と、活物質を含む負極合剤層が集電体に形成された負極板3とが多孔質セパレータ4を介して捲回した電極群5を有している。正極板2、負極板3およびセパレータ4の少なくとも1種の片面または両面に難燃化剤層が配されており、難燃化剤層は、非フッ素系有機重合体、難燃化剤および増粘剤を含有している。
【選択図】図1
Description
実施例1では、難燃化剤のホスファゼン化合物の94質量%、および、バインダのSBRの5質量%を、増粘剤のCMCの2質量%を溶解させたCMC水溶液に分散させ、水性スラリを作製した。得られた水性スラリを正極板2の両表面に直接塗布し、乾燥することで難燃化剤層を形成した。難燃化剤層が正極合材層に対して10質量%となるように水性スラリの塗布量を調整した。この正極板2を用いて、リチウムイオン二次電池1を作製した。
実施例2では、実施例1と同じ水性スラリを、PETフィルム上に塗布し乾燥させた後、正極板2の両表面に接触させ、ロールプレス機を通し転写することで、難燃化剤層を形成し、リチウムイオン二次電池1を作製した。
比較例1では、難燃化剤のホスファゼン化合物の80質量%、および、バインダのPVDFの20質量%を溶解させたNMP溶液(非水性スラリ)を調整した。得られたNMP溶液を正極板の両表面に直接塗布し、乾燥することで難燃化剤層を形成した。難燃化剤層が正極合材層に対して10質量%となるようにNMP溶液の塗布量を調整した。この正極板を用いて、リチウムイオン二次電池を作製した。すなわち、比較例1は、難燃化剤層に多孔が形成されていないリチウムイオン二次電池である。
比較例2では、比較例1と同じNMP溶液を、PETフィルム上に塗布し乾燥させた後、正極板の両表面に接触させ、ロールプレス機を通し転写することで、難燃化剤を形成し、リチウムイオン二次電池を作製した。すなわち、比較例2は、難燃化剤層に多孔が形成されていないリチウムイオン二次電池である。
比較例3では、比較例1と同じNMP溶液に造孔剤として酸化アルミニウムを分散させた分散液を調整した。得られた分散液を正極板2の両表面に直接塗布し、乾燥することで難燃化剤層を形成した。難燃化剤層が正極合材層に対して10質量%となるようにNMP溶液の塗布量を調整した。この正極板を用いて、リチウムイオン二次電池を作製した。すなわち、比較例3は、造孔剤により難燃化剤層に多孔が形成されたリチウムイオン二次電池である。
実施例および比較例の各電池について、放電レートを0.2CA、1CA、2CA、3CAに変えて放電試験を行い、それぞれの放電容量(mAh)を測定した。各放電レートにおける放電容量の測定結果を図2に示す。
次に、本実施形態のリチウムイオン二次電池1の作用等について説明する。
2 正極板
3 負極板
4 セパレータ
Claims (7)
- 活物質を含む正極合剤層が集電体に形成された正極板と、活物質を含む負極合剤層が集電体に形成された負極板とが多孔質セパレータを介して配置された非水電解液電池において、前記正極板、負極板およびセパレータの少なくとも1種の片面または両面に難燃化剤層が配され、該難燃化剤層は、非フッ素系有機重合体、難燃化剤および増粘剤を含有することを特徴とする非水電解液電池。
- 前記難燃化剤層は、前記非フッ素系有機重合体が2〜10質量%、前記難燃化剤が87〜97質量%、前記増粘剤が1〜3質量%の範囲の割合であることを特徴とする請求項1に記載の非水電解液電池。
- 前記非フッ素系有機重合体は、芳香族ビニル化合物ないし共役ジエン化合物を含む重合体であることを特徴とする請求項2に記載の非水電解液電池。
- 前記非フッ素系有機重合体は、スチレン−ブタジエン共重合体、アクリロニトリル−ブタジエン共重合体から選択される1種であることを特徴とする請求項3に記載の非水電解液電池。
- 前記難燃化剤は、常温で固体状態であり、非水溶性のホスファゼン化合物であることを特徴とする請求項1に記載の非水電解液電池。
- 前記難燃化剤層は、正極板、負極板およびセパレータの少なくとも1種の片面または両面に、前記非フッ素系有機重合体、難燃化剤および増粘剤を含有する水性スラリを塗布することで形成されたものであることを特徴とする請求項2に記載の非水電解液電池。
- 前記難燃化剤層は、前記混合物を樹脂膜または金属箔上に塗布後、正極板、負極板およびセパレータの少なくとも1種の片面または両面に、前記水性スラリを転写することで形成されたものであることを特徴とする請求項2に記載の非水電解液電池。
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EP11823521.7A EP2615668A4 (en) | 2010-09-06 | 2011-09-05 | NONAQUEOUS ELECTROLYTE BATTERY |
KR1020137005735A KR20140027045A (ko) | 2010-09-06 | 2011-09-05 | 비수 전해액 전지 |
PCT/JP2011/070145 WO2012033046A1 (ja) | 2010-09-06 | 2011-09-05 | 非水電解液電池 |
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WO2013032006A1 (ja) * | 2011-09-02 | 2013-03-07 | 株式会社Nttファシリティーズ | 非水電解液電池 |
WO2013154196A1 (ja) * | 2012-04-10 | 2013-10-17 | 住友化学株式会社 | 樹脂の使用、樹脂組成物、非水電解液二次電池用セパレーター及びその製造方法、並びに、非水電解液二次電池 |
JP2014225410A (ja) * | 2013-05-17 | 2014-12-04 | 日本ゼオン株式会社 | 二次電池多孔膜用スラリー、二次電池用セパレータ、二次電池用電極及び二次電池 |
JP2019046733A (ja) * | 2017-09-06 | 2019-03-22 | トヨタ自動車株式会社 | 非水電解質二次電池 |
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US10707531B1 (en) | 2016-09-27 | 2020-07-07 | New Dominion Enterprises Inc. | All-inorganic solvents for electrolytes |
JP6981164B2 (ja) * | 2017-10-13 | 2021-12-15 | トヨタ自動車株式会社 | 正極板および非水電解質二次電池 |
KR20220057243A (ko) * | 2020-10-29 | 2022-05-09 | 주식회사 엘지에너지솔루션 | 난연성 그룹 함유 중합체, 이를 포함하는 비수전해질 전지 세퍼레이터 세퍼레이터, 및 비수전해질 전지 |
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