リチウムイオン電池のNiおよびCoフリーカルコゲンベースのカトド化学における混合カチオンおよびアニオンリドックス
Sudhan Nagarajan1, Sooyeon Hwang2, Mahalingam Balasubramanian3
1Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, United States.
Journal of the American Chemical Society
|September 15, 2021
まとめ
研究者らはリチウムイオン電池を改良するために 硫黄ベースの新型カソッドを開発しました このアプローチは,伝統的な金属酸化物を越えて,混合アニオンおよびカチオン酸化還元反応を利用することで,安定性と容量を高めます.
科学分野:
- 材料科学
- 電気化学
- 固体化学
背景:
- リチウムイオン電池の従来の層状酸化カトッドは理論上の容量制限に直面しています.
- 電流カトドにおけるアニオン酸化還元反応は,弱い金属-酸素結合因子による安定性の問題を引き起こします.
研究 の 目的:
- カソード材料におけるメタル-リガンド共振性を改善する.
- 硫黄の組み込みによる可逆混合アニオン・カチオン・リドックス化学を活用する.
- 先進的なリチウムイオン電池のための新しい,安定したカトド材料を開発する.
主な方法:
- 低電子負カルコゲンリガンドとして硫黄をカトドフレームに導入する.
- Feリドックスカップルによる層状カトド材料 (Li2SnS3) の合成と特徴付け
- 電子エネルギー損失スペクトロスコーピー (EELS) とX線吸収近縁構造 (XANES) を利用して電荷分析を行う.
- 高解像度伝送電子顕微鏡 (HRTEM) と高角度環状ダークフィールドスキャン伝送電子顕微鏡 (HAADF-STEM) を利用して構造分析を行う.
主要な成果:
- 硫黄を統合することにより,強化された金属-リガンド共振性を示した.
- 新しい材料で反転可能な混合アニオンとカチオンリドックス化学を特定した.
- サイクル中の構造変化,表面無形化,ナノ孔形成を観察した.
- リチウム抽出中に金属とリガンドの場所での電荷の貢献に関する洞察を提供した.
結論:
- 硫黄を用いた新しい層状カトド材料を成功裏に設計した.
- この研究は,NiとCoフリーカルコゲンカトドの開発への道を示しています.
- この発見は,カルコゲンベースの二重酸化還元カソッドにおける高度な機能的材料への道を切り開きます.
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