リドックス活性フェナントレネキノン三角形は,水性リチャージ可能な亜鉛電池で
Kwan Woo Nam1, Heejin Kim2, Yassine Beldjoudi1
1Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States.
Journal of the American Chemical Society
|January 3, 2020
まとめ
研究者は,水性充電式亜鉛電池 (ZB) のための新しい有機正極材料,フェナントレンキノンベースのマクロサイクル (PQ-Δ) を開発しました. この材料は,インターフェース抵抗を減らし,サイクル寿命を向上させることでバッテリーの性能を向上させ,エネルギー貯蔵のための有望なソリューションを提供します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 再充電可能な水性亜鉛電池 (ZB) は,安全性,コスト,およびレートの性能のために大規模なエネルギー貯蔵に有望である.
- キノンの化合物は,高い容量,持続可能性,低コストを提供するZBにとって魅力的なカトド材料です.
- サイクリング中のキノンベースのカトッドの溶解は,バッテリーの寿命を制限します.
研究 の 目的:
- 再充電可能な水性亜鉛電池のための安定した高性能カトド材料を開発する.
- 伝統的なキノンのカトドの溶解を克服するために
- 新しい有機マクロサイクルカトドの性能改善のメカニズムを調査する.
主な方法:
- レドックス活性三角フェナントレンキノンベースのマクロサイクル (PQ-Δ) の合成と特徴付け.
- 水性ZBにおけるカトド材料としてのPQ-Δの電気化学試験
- 密度関数理論 (DFT) の計算により,インターフェイス抵抗減少のメカニズムが解明される.
主要な成果:
- PQ-Δカトッドは,Zn2+イオンとH2O分子の挿入を示し,インターフェイス抵抗を効果的に低下させました.
- DFTの計算では,水素化Zn2+イオンの挿入が溶解エネルギーペナルティを低下させることを明らかにした.
- PQ-Δカトッドは,高い可逆容量 (210 mAh g−1) と優れたサイクル安定性 (500サイクル後に99.9%の保持率) を達成した.
結論:
- PQ-Δの硬い三角構造と水素イオン挿入は,電気化学的性能を大幅に向上させます.
- 二価イオンの溶解によって達成される低インターフェイス抵抗は,二価電池システムにとって極めて重要です.
- 電子活性有機マクロサイクルは,ZBのための高度なカトド材料を開発するための実行可能な戦略です.
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