JP7268160B2 - 全固体電池用電解質膜及びそれを含む全固体電池 - Google Patents
全固体電池用電解質膜及びそれを含む全固体電池 Download PDFInfo
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Description
[化学式1]
-[PA]n-[PB]m- … 化学式1
実施例1
溶媒としてのテトラヒドロフラン(THF)に、ポリスチレン-ポリエチレンオキサイド共重合体(PS-b-PEO、イオン伝導度:5×10-6(常温条件))とポリスチレン(分子量(Mn):7kg/mol、ガラス転移温度(Tg):100℃)とを重量比で9:1の比率で投入して5wt%の高分子溶液を用意した。前記PS-b-PEOは、PSとPEOとの末端同士が結合された共重合体であり、分子量(Mn)がそれぞれ16kg/mol(PS部分)及び110kg/mol(PEO部分)であった。このとき、リチウム塩としてLiTFSIを[EO]/[Li+]=18/1(モル比)になるように一緒に投入した。前記高分子溶液をPs-b-PEO及びリチウム塩が十分に溶けるように60℃で一晩撹拌した。前記高分子溶液をスピンコーティングを用いて1000rpmで1分間コーティングした後、常温真空条件で一晩乾燥した。このような方式で固体電解質膜を収得した。収得された固体電解質膜の厚さは約30μmであった。
Ps-b-PEOとポリスチレンとの含量を80:20(重量比)にし、厚さを50μmにしたことを除き、実施例1と同じ方法で固体電解質膜を収得した。
溶媒としてアセトニトリル(AN)にポリエチレンオキサイド(Mw=4,000,000g/mol)を溶かして4wt%の高分子溶液を用意した。このとき、リチウム塩としてLiTFSIを[EO]/[Li+]=18/1(モル比)になるように一緒に投入した。前記高分子溶液をPEO及びリチウム塩が十分に溶けるように70℃で一晩撹拌した。次いで、開始剤と硬化剤を含む添加剤溶液を用意した。硬化剤としてはポリエチレングリコールジアクリレート(PEGDA、Mw=575)、開始剤は過酸化ベンゾイル(BPO)を使用し、PEGDAはPEO対比20wt%、BPOはPEGDA対比1wt%の量になるようにし、溶媒としてはアセトニトリルを使用した。前記添加剤溶液を投入した成分が十分混合されるように約1時間撹拌した。その後、前記添加剤溶液を前記高分子溶液に添加し、二つの溶液を十分に混合した。混合した溶液を離型フィルムにドクターブレードを用いて塗布及びコーティングした。コーティングギャップは800μm、コーティング速度は20mm/分にした。前記溶液がコーティングされた離型フィルムをガラス板に移し、水平を維持しながら常温条件で一晩乾燥し、100℃で12時間真空乾燥した。このような方式で固体電解質膜を収得した。収得された固体電解質膜の厚さは約50μmであった。
実施例1-1~1-3
実施例1を通じて三つの固体電解質膜サンプルを用意した。これをそれぞれ常温(実施例1-1)、100℃で1時間露出(実施例1-2)、100℃で12時間露出(実施例1-3)の条件で維持した後、回収してイオン伝導度を測定した。下記の表1にイオン伝導度の測定結果を示した。
実施例2-1及び2-2
実施例2を通じて実施例2-1及び2-2の二つの固体電解質膜サンプルを用意した。これを、それぞれ常温条件(実施例2-1)及び100℃で12時間露出する条件(実施例2-2)で維持した後、回収してイオン伝導度を測定した。下記の表2にイオン伝導度の測定結果を示した。
比較例1を通じて二つの固体電解質膜サンプルを用意した。これを、それぞれ常温条件(比較例1-1)及び100℃で12時間露出する条件(比較例1-2)で維持した後、回収してイオン伝導度を測定した。下記の表3にイオン伝導度の測定結果を示した。
電極活物質としてのNCM811(LiNi0.8Co0.1Mn0.1O2)、導電材としてのVGCF(気相法炭素繊維(vapor grown carbon fiber))及び高分子系固体電解質(PEO+LiTFSI、18:1モル比)を80:3:17の重量比で混合し、アセトニトリルに投入して撹拌して電極スラリーを製造した。これを厚さ20μmのアルミニウム集電体にドクターブレードを用いて塗布し、その結果物を120℃で4時間真空乾燥した。その後、前記真空乾燥の結果物をロールプレスを用いて圧延工程を行って、2mAh/cm2の電極ローディング、電極層の厚さが48μm、気孔度が22vol%である電極を収得した。
放電時:CCモードで3Vまで0.05Cで放電
Claims (11)
- 全固体電池用固体電解質膜であって、
前記固体電解質膜は、1×10-7S/cm以上のイオン伝導度を有し、
イオン伝導性の低い高分子材料(A)と固体電解質材料(B)との混合物を含み、
前記高分子材料(A)はイオン伝導度が9×10-8S/cm以下であり、固体電解質材料(B)はイオン伝導度が1×10-7S/cm以上であり、
前記固体電解質材料(B)は、高分子系固体電解質材料を含み、
前記固体電解質膜は、温度変化に応じて固体電解質材料(B)と高分子材料(A)との相分離が誘導されて固体電解質膜内に高分子材料(A)を含むイオン伝導遮断層が形成され、前記温度変化は温度上昇である、固体電解質膜。 - 前記高分子材料(A)は、ポリオレフィン系高分子、ポリスチレン系高分子、ポリアクリレート系高分子、ポリカーバイド系高分子、ポリエステル系高分子またはこれらのうち二つ以上を含む、請求項1に記載の固体電解質膜。
- 前記固体電解質材料(B)は、固体電解質材料100wt%に対して高分子系固体電解質材料を90wt%以上で含み、高分子樹脂とリチウム塩とが混合された複合物を含む、請求項1または2に記載の固体電解質膜。
- 前記固体電解質材料(B)は高分子系固体電解質材料を含み、前記高分子系固体電解質材料は高分子樹脂とリチウム塩とが混合された複合物を含み、前記高分子樹脂は高分子材料(A)を構成する重合単位を含む共重合体である、請求項1から3のいずれか一項に記載の固体電解質膜。
- 前記高分子樹脂は、ポリエーテル系高分子、ポリカーボネート系高分子、アクリレート系高分子、ポリシロキサン系高分子、ホスファゼン系高分子、ポリエチレン誘導体、アルキレンオキサイド系高分子、リン酸エステル系高分子、ポリアジテーションリシン、ポリエステルスルファイド、ポリビニルアルコール、ポリフッ化ビニリデン系高分子、イオン性解離基を含む重合体のうち少なくともいずれか一つを含み、前記高分子樹脂の高分子鎖内に高分子材料(A)を構成する重合単位を含む、請求項4に記載の固体電解質膜。
- 前記重合単位は、オレフィン系重合単位、スチレン系重合単位、アクリル系重合単位、カーバイド系重合単位、エステル系重合単位またはこれらのうち二つ以上である、請求項4または5に記載の固体電解質膜。
- 前記高分子樹脂は、ポリスチレン-ポリエチレンオキサイド共重合体を含む、請求項4から6のいずれか一項に記載の固体電解質膜。
- 前記高分子樹脂は、高分子樹脂100wt%に対して高分子材料(A)を構成する重合単位を51wt%~99wt%で含む、請求項4から7のいずれか一項に記載の固体電解質膜。
- 前記固体電解質材料(B)100重量部に対して高分子材料(A)が7重量部~80重量部である、請求項4から8のいずれか一項に記載の固体電解質膜。
- 前記高分子材料(A)は分子量(Mn)が1kg/mol~10,000kg/molである、請求項1から9のいずれか一項に記載の固体電解質膜。
- 前記高分子材料(A)はガラス転移温度及び/または溶融温度が150℃以下ある、請求項1から10のいずれか一項に記載の固体電解質膜。
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- 2020-05-11 CN CN202080028816.9A patent/CN113692667B/zh active Active
- 2020-05-11 EP EP20802045.3A patent/EP3907802A4/en active Pending
- 2020-05-11 US US17/413,213 patent/US12095115B2/en active Active
- 2020-05-11 KR KR1020200056183A patent/KR20200130189A/ko not_active Application Discontinuation
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US12095115B2 (en) | 2024-09-17 |
US20220069415A1 (en) | 2022-03-03 |
CN113692667A (zh) | 2021-11-23 |
EP3907802A4 (en) | 2022-04-27 |
JP2022513248A (ja) | 2022-02-07 |
EP3907802A1 (en) | 2021-11-10 |
WO2020226472A1 (ko) | 2020-11-12 |
CN113692667B (zh) | 2024-09-20 |
KR20200130189A (ko) | 2020-11-18 |
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