JP6996039B2 - リチウム二次電池用電解質膜、それを適用したリチウム二次電池用膜-電極構造体の製造方法 - Google Patents
リチウム二次電池用電解質膜、それを適用したリチウム二次電池用膜-電極構造体の製造方法 Download PDFInfo
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Description
本発明のリチウム二次電池用電解質膜は、前記化学式1~化学式4のいずれか1つで表示される化合物と、およびリチウム塩とを含み、リチウムイオン移送チャネルが形成されたことを特徴とする。
本発明のリチウム二次電池用バインダーは、前記化学式1~化学式4のいずれか1つで表示される化合物と、およびリチウム塩とを含み、リチウムイオン移送チャネルが形成されたことを特徴する。
本発明のリチウム二次電池用膜-電極構造体は、前記化学式1~化学式4のいずれか1つで表示される化合物およびリチウム塩を含む電解質膜と、前記電解質膜と同じ組成物で形成されるバインダーと、および前記電極バインダーにより前記電解質膜と結合された電極とを含み、リチウムイオン移送チャネルが形成されたことを特徴する。
化合物の製造
図1は、本発明の化合物を示した図である。
図1を参照すると、本発明の化合物は、PAESおよびPAEKを主鎖とPEGの反応で形成された、グラフティング(grafting)されたり、ブロック共重合体の形態の高分子物質であることができる。具体的には、4,4-ビス(4-ヒドロキシフェニル)吉草酸(4,4-bis(4-hydroxyphenyl)valeric acid、95%)およびビス(4-フルオロフェニル)スルホン(bis(4-fluorophenyl)sulfone、99%)を利用して、ポリアリーレンエーテルスルホンをベースにした高分子の主鎖となるPAES-COOHを合成した。また、4,4-ビス(4-ヒドロキシフェニル)吉草酸(4,4-bis(4-hydroxyphenyl)valeric acid、95%)および4,4’-ジフルオロベンゾフェノン(4,4’-Difluorobenzophenone、DBP)を利用して、ポリアリーレンエーテルケトンをベースにした高分子の主鎖となるPAEK-COOHを合成した。前記合成されたPAES-COOHとPAEK-COOHにポリエチレングリコールモノエチルエーテル(PEG)をグラフティングさせてPAES-g-PEGとPAEK-g-PEG共重合体を合成した。合成されたPAES-g-PEGとPAEK-g-PEG共重合体はそれぞれ、(a)と(b)で表される構造を有する。
本発明の実施例1で製造されたPAES-g-PEGの合成を確認するためには、PAES-COOHと製造されたPAES-g-PEGのそれぞれを核磁気共鳴分析(1H-NMR)とフーリエ変換赤外分光法(FT-IR)を利用してデータを得て、それぞれの結果を図2-A~図2-Cに示した。
電解質膜の製造
リチウム塩としてLiTFSI(Lithium bis(trifluoromethanesulfonyl))を用いて電解質膜を製造した。前記LiTFSIおよび前記実施例1で製造されたPAES-g-PEGをテトラヒドロフラン(tetrahydrofuran、THF)に溶解させた後、ガラス板に一定の厚さに鋳造した後、乾燥させて固体電解質膜を製造した。このとき、前記LiTFSIの重量比を調節して、様々なLiTFSIの重量比を有する固体電解質膜を製造した。
本発明の実施例2で製造された固体電解質膜の電気的特性をナイキスト(Nyquist)線図およびリチウムイオン伝導度のグラフで評価した。前記グラフを図3および図4に示した。
バインダーを導入した陽極の製造
前記実施例2と同じ操作を実行して、さまざまなLiTFSIの重量比を有するバインダーを製造した。陽極用活物質LiCoO2を80%、カーボンブラックを10%、様々なLiTFSIの重量比を有するバインダーを10%をN-メチル-2-ピロリジン(N-methyl-2-pyrrolidone、NMP)に溶解させた後、アルミホイルに鋳造し、陽極に製造した。
前記実施例2と同じ操作を実行して、さまざまなLiTFSIの重量比を有するバインダーを製造した。陽極用活物質LiNiMnCoO2を80%、カーボンブラック10%、様々なLiTFSIの重量比を有するバインダーを10%をN-メチル-2-ピロリジン(N-methyl-2-pyrrolidone、NMP)に溶解させた後、アルミホイルに鋳造し、陽極に製造した。
本発明の実施例3にしたがって製造されたバインダーが導入された陽極の表面と断面分析を行った。その比較例として、従来のリチウム二次電池用バインダーとして使用されるPVDFが導入された陽極を使用した。それぞれの陽極の表面と断面画像を走査電子顕微鏡(Scanning Electron Microscope、SEM)を用いて得て、その結果を図5に示した。
本発明の実施例3にしたがって製造されたバインダーが導入された陽極物質の元素分析をエネルギー分散型分光分析法(Energy Dispersive Spectrometry、EDS)を用いて行った。その結果を図6に示した。
本発明の実施例2に従って製造された電解質膜であるPAES-g-PEG電解質膜におけるPAES-g-PEGバインダーの界面抵抗とその比較例としてPAES-g-PEG電解質膜におけるPVDFバインダーの界面抵抗それぞれをナイキスト線図を通じて分析し、その結果を図7に示した。
様々な濃度のLiTFSIを含むPAES-g-PEGバインダーで製造した陽極の柔軟性評価を行った。前記柔軟性の評価は、前記陽極を半分に折ったり、ガラス棒に巻いたとき、表示される形態を肉眼で観察して行った。その結果を図8に示した。
本バインダーを導入した陽極の接着力を評価するために、アルミホイルにおけるPAES-g-PEGバインダーと、活物質として、それぞれLiCoO2、LiNiMnCoO2およびSulfur/CNTを用いた陽極におけるPAES-g-PEGバインダーの接着力を分析した。その結果を図9-A~図9-Dに示した。
本発明の電解質膜とそれと同じ組成物で形成されたバインダーを含む全固体リチウムイオン電池システムでは、それぞれ様々な濃度のLiTFSI塩を含むPAES-g-PEGバインダーと活物質LiCoO2、LiNiMnCoO2、Sulfur/CNTで製造した陽極との適合性をテストするために、電圧電流法を用いて、それぞれの充放電サイクルを測定し、その結果を図10~図12に示した。
Claims (13)
- 前記リチウム塩は、LiTFSI(Lithium bis(trifluoromethanesulfonyl))、LiPF6、LiBF4、LiSbF6およびLiAsFから選択されたいずれかの1つであることを特徴とする
請求項1に記載のリチウム二次電池用電解質膜。 - 前記リチウム塩は、前記リチウム二次電池用電解質膜に対し、10%~50%の重量比を有することを特徴とする
請求項1に記載のリチウム二次電池用電解質膜。 - 前記リチウム塩は、前記リチウム二次電池用電解質膜に対し、40%~50%の重量比を有することを特徴とする
請求項3に記載のリチウム二次電池用電解質膜。 - 前記リチウム塩は、LiTFSI(Lithium bis(trifluoromethanesulfonyl))、LiPF6、LiBF4、LiSbF6およびLiAsFから選択されたいずれかの1つであることを特徴とする
請求項5に記載のリチウム二次電池用バインダー。 - 前記リチウム塩は、前記リチウム二次電池用バインダーに対し、10%~50%の重量比を有することを特徴とする
請求項5に記載のリチウム二次電池用バインダー。 - 前記リチウム塩は、前記リチウム二次電池用バインダーに対し、40%~50%の重量比を有することを特徴とする
請求項5に記載のリチウム二次電池用バインダー。 - 前記電解質膜に対する前記バインダーの界面抵抗が1800~2100Ωであることを特徴とする
請求項9に記載のリチウム二次電池用膜-電極構造体。 - 前記リチウム塩は、LiTFSI(Lithium bis(trifluoromethanesulfonyl))、LiPF6、LiBF4、LiSbF6およびLiAsFから選択されたいずれかの1つであることを特徴とする
請求項10に記載のリチウム二次電池用膜-電極構造体。 - 前記リチウム塩は、前記リチウム二次電池用膜-電極構造体に対し、10%~50%の重量比を有することを特徴とする
請求項10に記載のリチウム二次電池用膜-電極構造体。 - 前記リチウム塩は、前記リチウム二次電池用膜-電極構造体に対し、40%~50%の重量比を有することを特徴とする
請求項10に記載のリチウム二次電池用膜-電極構造体。
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US20210313620A1 (en) | 2021-10-07 |
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