JP6954499B1 - リチウムイオン二次電池及び分離膜 - Google Patents
リチウムイオン二次電池及び分離膜 Download PDFInfo
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- JP6954499B1 JP6954499B1 JP2021523095A JP2021523095A JP6954499B1 JP 6954499 B1 JP6954499 B1 JP 6954499B1 JP 2021523095 A JP2021523095 A JP 2021523095A JP 2021523095 A JP2021523095 A JP 2021523095A JP 6954499 B1 JP6954499 B1 JP 6954499B1
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- separation membrane
- solvent
- negative electrode
- mixture layer
- positive electrode
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Abstract
Description
空隙率=(1−a/b)×100
PET製のシート(8×8cm、厚さ0.035mm)の上にシリコンゴム製の枠(4×4cm、厚さ1mm)を設置し、枠の中に下記式(3)で表されるポリエチレングリコールジアクリレート(式中のn=14、商品名:NKエステルA−600、新中村化学工業社製)6.0gと、ジグライム(富士フイルム和光純薬社製)4.0gと、硝酸リチウム(富士フイルム和光純薬社製)1.4gと、アゾビスイソブチロニトリル(富士フイルム和光純薬社製)1.0gとを混合したスラリを入れた。ホットプレートを用いて、60℃で1時間加熱してポリエチレングリコールジアクリレートを重合させることにより、ポリ(ポリエチレングリコールジアクリレート)製の分離膜を得た。分離膜を枠から外して、以下に示す試験に供した。
実施例1において、ポリエチレングリコールジアクリレートをポリテトラフルオロエチレン(富士フイルム和光純薬社製)に変更し、アゾビスイソブチロニトリル(富士フイルム和光純薬社製)を無添加とした以外は、実施例1と同様の方法により分離膜を作製した。これにより、ポリテトラフルオロエチレン(PTFE)製の分離膜を得た。
ポリオレフィンで形成された多孔体(ガーレー値:1秒/100cc、空隙率:60体積%、厚み:20μm)を用意した。多孔体の表面全体に、実施例1と同様の方法で作製したスラリを塗布してから、60℃で1時間加熱してポリエチレングリコールジアクリレートを重合させた。これにより、多孔体にポリ(ポリエチレングリコールジアクリレート)が塗布された分離膜を得た。
実施例3において、ポリエチレングリコールジアクリレートを、実施例2と同様のポリテトラフルオロエチレンに変更した以外は、実施例3と同様の方法により分離膜を作製した。これにより、多孔体にPTFEが塗布された分離膜を得た。
実施例3において、無機酸化物粒子Li7La3Zr2O12(富士フイルム和光純薬社製)を、分離膜全量に対して1体積%となるように更に添加したスラリを多孔体に塗布した以外は、実施例3と同様の方法により分離膜を作製した。これにより、リチウムイオン伝導性を有するポリマ製の多孔体に、ポリ(ポリエチレングリコールジアクリレート)及び無機酸化物粒子が塗布された分離膜を得た。
実施例5において、ポリエチレングリコールジアクリレートを、実施例2と同様のテトラフルオロエチレンに変更した以外は、実施例5と同様の方法により分離膜を作製した。これにより、リチウムイオン伝導性を有するポリマ製の多孔体に、PTFE及びSiO2が塗布された分離膜を得た。
実施例1において、ポリエチレングリコールジアクリレートをエチルシアノアクリレート(富士フイルム和光純薬社製)に変更した以外は、実施例1と同様の方法により分離膜を作製した。これにより、ポリエチルシアノアクリレート製の分離膜を得た。
実施例3において、ポリエチレングリコールジアクリレートを、比較例1と同様のエチルシアノアクリレートに変更した以外は、比較例1と同様の方法により分離膜を作製した。これにより、リチウムイオン伝導性を有するポリマ製の多孔体にポリエチルシアノアクリレートが塗布された分離膜を得た。
実施例5において、ポリエチレングリコールジアクリレートを、比較例1と同様のエチルシアノアクリレートに変更した以外は、実施例5と同様の方法により分離膜を作製した。これにより、リチウムイオン伝導性を有するポリマ製の多孔体にポリエチルシアノアクリレート及び無機酸化物粒子が塗布された分離膜を得た。
実施例又は比較例に係る分離膜と、セパレータ(UP3085、宇部興産社製)とを重ね、これらを2枚のシリコンゴム(厚み0.5mm)製シートで挟んだものを、H型セルの間に配置した。分離膜側のセルにジメチルカーボネート(DMC)を入れ、所定日数経過後のセパレータの外観を目視にて観察した。分離膜が溶媒分離能力に優れていると、DMCが分離膜を透過しにくいため、セパレータにDMCが浸透しにくいが、溶媒分離能力に劣る分離膜であれば、DMCが分離膜を透過してセパレータに浸透する。よって、セパレータの外観を観察し、セパレータへのDMCの浸透の有無を確認することにより、分離膜の溶媒(第1の溶媒及び第2の溶媒に相当する溶媒)の分離能力を評価することができる。試験開始から1日経過後であってもセパレータへのDMCの浸透がない場合に、表1〜表3において「≧1日」と示し、この場合、分離膜の溶媒分離能力が優れているといえる。一方、表1〜表3において、1日経過後にDMCの浸透が見られた場合には「<1日」と示す。表1〜表3に示すように、実施例に係る分離膜では1日以上経過してもセパレータへのDMCの浸透がなかったが、比較例に係る分離膜では1日経過後にはセパレータへDMCが浸透していた。
Claims (10)
- 正極合剤層、分離膜、及び負極合剤層をこの順に備えるリチウムイオン二次電池であって、
前記正極合剤層が、正極活物質、第1のリチウム塩、及び第1の溶媒を含有し、
前記負極合剤層が、負極活物質、第2のリチウム塩、及び前記第1の溶媒とは異なる第2の溶媒を含有し、
前記分離膜が、(メタ)アクリロイル基を有するモノマの少なくとも1種をモノマ単位として含む樹脂及びフッ素を含むオレフィンの少なくとも1種をモノマ単位として含む樹脂からなる群より選択される少なくとも1種の樹脂を含有する、リチウムイオン二次電池。 - 前記分離膜が、多孔体と、前記多孔体に保持された前記樹脂と、を含有する、請求項1に記載のリチウムイオン二次電池。
- 前記多孔体がポリマで形成されている、請求項2に記載のリチウムイオン二次電池。
- 前記分離膜が、前記多孔体に保持された無機酸化物粒子を更に含有する、請求項2又は3に記載のリチウムイオン二次電池。
- 前記分離膜が、第3のリチウム塩と、第3の溶媒とを更に含有する、請求項1に記載のリチウムイオン二次電池。
- 正極活物質、第1のリチウム塩、及び第1の溶媒を含有する正極合剤層と、負極活物質、第2のリチウム塩、及び前記第1の溶媒とは異なる第2の溶媒を含有する負極合剤層と、を備えるリチウムイオン二次電池において、前記正極合剤層及び前記負極合剤層の間に配置されるための分離膜であって、
(メタ)アクリロイル基を有するモノマの少なくとも1種をモノマ単位として含む樹脂及びフッ素を含むオレフィンの少なくとも1種をモノマ単位として含む樹脂からなる群より選択される少なくとも1種の樹脂を含有する、分離膜。 - 多孔体と、前記多孔体に保持された前記樹脂と、を含有する、請求項6に記載の分離膜。
- 前記多孔体がポリマで形成されている、請求項7に記載の分離膜。
- 前記多孔体に保持された無機酸化物粒子を更に含有する、請求項7又は8に記載の分離膜。
- 第3のリチウム塩と、第3の溶媒とを更に含有する、請求項6に記載の分離膜。
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GB9708365D0 (en) * | 1997-04-25 | 1997-06-18 | Johnson Matthey Plc | Proton conducting membranes |
JP3566891B2 (ja) * | 1999-10-05 | 2004-09-15 | シャープ株式会社 | リチウム二次電池 |
HUE042435T2 (hu) * | 2013-12-06 | 2019-07-29 | Daikin Ind Ltd | Szétválasztó másodlagos akkumulátorhoz, valamint másodlagos akkumulátor |
EP3736880B1 (en) * | 2019-05-09 | 2021-07-07 | Ningde Amperex Technology Limited | Separator and lithium ion battery |
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JP2002280070A (ja) * | 2001-03-19 | 2002-09-27 | Sanyo Electric Co Ltd | 非水電解質二次電池およびその製造方法 |
JP2005317499A (ja) * | 2004-03-29 | 2005-11-10 | Sanyo Electric Co Ltd | 非水電解質二次電池 |
JP2010192185A (ja) * | 2009-02-17 | 2010-09-02 | Toyota Motor Corp | リチウム二次電池とその製造方法 |
JP2014197511A (ja) * | 2013-03-29 | 2014-10-16 | 富士重工業株式会社 | 非水電解液二次電池 |
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WO2022107253A1 (ja) | 2022-05-27 |
CN116325260A (zh) | 2023-06-23 |
TW202230870A (zh) | 2022-08-01 |
US20230291074A1 (en) | 2023-09-14 |
US20230178850A1 (en) | 2023-06-08 |
EP4235936A2 (en) | 2023-08-30 |
EP4235936A3 (en) | 2023-10-25 |
JPWO2022107253A1 (ja) | 2022-05-27 |
KR20230095974A (ko) | 2023-06-29 |
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EP4195344A4 (en) | 2023-10-18 |
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