交換媒介による電解質の輸送:超高速か超遅い?
Bogdan Dereka1,2,3,4, Nicholas H C Lewis1,2,3,4, Yong Zhang4,5
1James Franck Institute, The University of Chicago, Chicago, Illinois 60637, United States.
Journal of the American Chemical Society
|April 26, 2022
まとめ
超高速スペクトロスコピーは,電池の電解質のイオン溶剤交換は100ピコ秒以内に起こらないことを明らかにします. 観測されたダイナミクスはエネルギー転送によるもので,これまで考えられていたよりも遅いイオン溶媒相互作用を示唆している.
科学分野:
- 電気化学
- 材料科学
- 物理化学
背景:
- 電池の電解質のイオン輸送メカニズムを理解することは,高度な電解質の設計に不可欠です.
- 現在のモデルは,イオン輸送のための車両拡散と構造的拡散 (溶媒交換) について議論しています.
研究 の 目的:
- バッテリー電解質の化学交換とエネルギー転送のダイナミクスを区別する.
- 様々な電解質におけるイオン溶剤相互作用の時間スケールを決定する.
主な方法:
- アセトニトリルイソトポログの超高速二次元赤外線 (2D IR) スペクトロスコーピーを利用した.
- Li+,Mg2+,Zn2+,Ca2+,およびBa2+ bis ((トリフローロメチルスルフォニル) イミド塩を含む試験中の電解質
- 分子動力学 (MD) シミュレーションと導電性測定を組み合わせた2D IR.
主要な成果:
- すべての試験されたイオンと濃度で100ピコ秒以内にイオン溶剤交換の証拠は観察されなかった.
- 全てのスペクトルダイナミクスは 分子間のエネルギー伝達によるもので 溶媒の交換によるものではありません
- イオン溶媒の滞在時間は数百ピコ秒という実験上の下限を確立した.
結論:
- イオン溶剤のレジデンスの時間は,以前に示唆されたより大幅に長い.
- イオン輸送は,濃度によって影響される車両および構造的メカニズムの連続体として見ることができる.
- 電解質の集合運動は様々な電池システムにおけるイオン輸送において重要な役割を果たします.
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