高性能カリウム貯蔵のための堅固な共性有機フレームワークの複数のアクセス可能なレドックス活性サイト
Xue-Ling Chen1, Mo Xie1, Ze-Lin Zheng1
1College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China.
Journal of the American Chemical Society
|February 16, 2023
まとめ
この研究は,高性能カリウムイオン電池 (KIB) アノドのための新しい多孔共性有機フレームワーク (COF) を導入します. この新しい材料は,高度なエネルギー貯蔵のための優れた容量,速度能力,サイクル安定性を提供します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- イオン電池 (KIB) のアノドには,孔状の構造と安定性があるため,共性有機フレームワーク (COF) が有望である.
- 現在のCOFベースのKIBアノードは,可逆性および速度能力の制限に直面しています.
研究 の 目的:
- カリウムの貯蔵性能を向上させた新型の多孔性大容量COFを設計し,研究する.
- COFで高性能なカリウム貯蔵を担う主要な構造的および電子的特徴を特定する.
主な方法:
- 有望なCOF構造を特定するために理論的な計算が採用されました.
- 設計された多孔なボリュームCOFの合成と特徴付け
- KIBアノドとしてのCOFの電気化学試験
主要な成果:
- 設計された多孔型COFは,0.1°Cで423mAhg−1の高い可逆容量を示している.
- 10 C で 185 mAh g−1 の優れたレート能力が達成されました.
- 材料は強固なサイクル安定性と最小限の体積変化を示した.
結論:
- ピラジンとカルボニルを含む多孔性COFは,効率的なカリウム貯蔵のために複数のアクセス可能な酸化還元部位を提供します.
- 表面に支配された貯蔵メカニズムと安定した電極構造は,優れたKIBアノド性能に貢献します.
- この研究は,活性サイトがCO,CN,およびカチオン-π相互作用であることを確認し,先進的なCOF設計の道を開いた.
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