位置ゲル化共性有機フレームワーク 超絶的なイオン伝導性のための長距離相互接続した骨格を持つ電解質
Chaoqun Niu1,2, Shu Zhao1,2, Yuxi Xu2
1Zhejiang University, Hangzhou 310027, Zhejiang Province, China.
Journal of the American Chemical Society
|December 19, 2023
まとめ
COFゲル電解質 (CGEs) を作る新しい方法を開発し バッテリー性能を改善しました これらのCGEはイオン輸送を改善し,安定したリチウム金属電池を実現します.
科学分野:
- 材料科学
- 電気化学
- ポリマー化学
背景:
- コヴァレント有機フレームワーク (COF) は,イオン輸送に理想的なオーダーナノチャネルを提供します.
- 最適な電解質のためのバッテリー製造とCOF合成を統合する課題が存在します.
- 既存の方法は連続的なイオンチャンネルと 低インペデンスインターフェースを 作り出すのに苦労しています
研究 の 目的:
- COFゲル電解質 (CGEs) の製造のための in situ 凝縮法を開発する.
- COF合成を電池の電解質調製環境に直接統合する.
- 電池の電解質のイオン輸送と電気化学的インターフェースの特性を向上させる.
主な方法:
- 液体炭酸エレクトロライトの中でCOFゲル電解質 (CGEs) を合成するために,in-situ凝縮技術が使用されました.
- この方法は,リチウム塩とCOFの構成要素の相互接続した結晶COFの骨格間の前期調整を使用します.
- イオン伝導を強化するために,リチウム親和グループがCOFに組み込まれました.
主要な成果:
- 液体電解質と比較して,開発されたCGEsはイオン伝導性の3倍 (10. 5mS cm - 1) を示した.
- 低活性エネルギー (0.068 eV) は,効率的なイオン輸送と1800時間以上のデンドライトフリーリチウム堆積を促進しました.
- 優れた速度性能 (3°Cで101 mAh g-1) と極端な条件下でのサイクル安定性 (158 mAh g-1) が達成されました.
結論:
- この in situ 凝縮法では,COFの合成とバッテリー電解質の調製を成功裏に統合しています.
- その結果,CGEはリチウムイオン電池のイオン伝導性,安定性,性能を大幅に高めます.
- この方法論は多用途で,様々な金属イオン電池システム (K,Mg,Zn,Na,Ca) に適用できます.
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