レドックスメディエーターによって強化された全固体リチウム硫黄電池
Xin Gao1, Xueli Zheng1, Yuchi Tsao2
1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|October 22, 2021
まとめ
この研究では,完全固体リチウム硫黄電池 (ASSLSB) のためのリドックスメディエーター (RMs) が導入され,硫黄リチウム酸化のためのエネルギーバリアを大幅に低下させ,バッテリーの性能と安定性を改善します.
科学分野:
- 電気化学
- 材料科学
- エネルギー貯蔵
背景:
- レドックスメディエーター (RMs) は液体電解質電池において重要な役割を果たしているが,固体電池では未開発である.
- 完全固体リチウム硫黄電池 (ASSLSB) は,硫化リチウム (Li2S) 酸化エネルギーバリアに問題があります.
- 効率的なRMの開発は,ASSLSBの潜在能力を解き放つための鍵です.
研究 の 目的:
- 完全固体リチウム硫黄電池のリドックスメディエーター候補を調査する.
- Li2S酸化を促進するリドックスメディエーターの役割と行動を調査する.
- ASSLSBの電気化学性能と安定性を改善する.
主な方法:
- キノンベースの化合物に焦点を当てた,酸化還元媒介候補のスクリーニング.
- リオックスメディエーターを含む Li2S カソードの電気化学的特徴.
- 硫黄のKエッジX線吸収スペクトロスコーピーを操作して硫黄の種化を追跡する.
- サイクルの安定性と速度能力を含む性能評価
主要な成果:
- キノンベースのリドックスメディエーター (AQT) は,Li2S酸化に有利なリドックスポテンシャルと可逆性を示した.
- AQTを搭載したASSLSBは,充電エネルギーバリアの減少 (2.4V) と高い放電容量 (1133 mAh gs-1) を示した.
- オペラントスペクトロスコピーは,AQTが固体-ポリ硫化物-固体反応を促進し,Li2S酸化運動性を強化することを確認した.
結論:
- レドックスメディエーター,特にAQTは,ASSLSBにおけるLi2S酸化の活性化エネルギーを効果的に低下させることができます.
- AQT強化経路は,硫黄の利用,サイクル安定性 (150サイクルで98.9%CE),および速度能力を大幅に改善します.
- この研究は,固体電池におけるLi-S反応を加速させるための効果的なリドックスメディエーターを設計するための経路を確立している.
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