▌Probing Li2S Activation Mechanism in Lithium–Sulfur Batteries via Multimodal Operando Techniques
以多模態原位技術探究鋰硫電池中 Li₂S 的活化機制
E. B. Tamilarasan, Y. C. Huang, T. Agnihotri, T. I. Yeh, Y. Nikodimos*, E. A. Moges, S. A. Ahmed, R. Hasan, A. V. Saravanan, B. W. Taklu, S. H. Wu, W. N. Su* and B. J. Hwang*
https://doi.org/10.1021/acsenergylett.5c03358
SEED Member: B. J. Hwang, W. N. Su, S. H. Wu
Major Contributions
1. Multimodal operando techniques (in situ XRD, XAS, Raman, optical microscopy) are applied to directly observe the Li₂S activation process in real time, capturing intermediate species and phase transformations during the first charge.
2. The study reveals the step-by-step deactivation and reactivation pathways of Li₂S, elucidating the origin of high overpotential and sluggish kinetics associated with Li₂S oxidation in lithium–sulfur batteries.
3. Mechanistic insights linking activation conditions to electrochemical performance provide design guidelines for Li₂S cathode pretreatment and electrolyte formulation to improve cycle efficiency.
主要貢獻
1. 採用多模態原位表徵技術（原位 XRD、XAS、拉曼、光學顯微術）實時直接觀察 Li₂S 活化過程，捕捉首次充電期間的中間物種與相變。
2. 揭示 Li₂S 的逐步失活與再活化路徑，闡明鋰硫電池中 Li₂S 氧化所伴隨高過電位與遲緩動力學的起源。
3. 連結活化條件與電化學性能的機制洞察，為 Li₂S 正極預處理與電解液設計提供改善循環效率的指導方針。
