▌Anion-trapping composite gel electrolyte for safer and more stable anode-free lithium-metal batteries
陰離子捕捉複合凝膠電解質在無陽極鋰金屬電池中實現更安全且穩定的性能
T. Agnihotri, S.A. Ahmed, E.B. Tamilarasan, R. Hasan, B.T. Hotasi, H.K. Bezabh, S. Suwito, Y. Nikodimos, S.K. Jiang, K.N. Shitaw, Z.B. Muche, P.Y. Huang, Y.C. Lee, W.N. Su*, S.H. Wu*, B.J. Hwang*
https://doi.org/10.1016/j.cej.2024.149608
SEED Member: W.N. Su, S.H. Wu, B.J. Hwang
Major Contributions
1. Development of a novel composite gel polymer electrolyte (GPE) by combining PVDF-HFP and fluorinated polyimide (F-PI) through thermal treatment, creating a unique 3D crosslinked structure with enhanced thermal stability and safety features.
2. Discovery of an innovative anion-trapping mechanism where the amide bond (N-H moiety) in F-PI captures FSI- anions through strong H-bonding interaction, leading to improved Li-ion transport with a high Li+ transference number of 0.7.
3. Achievement of exceptional cycling stability in anode-free lithium metal batteries (AFLMBs), maintaining approximately 70% capacity retention after 100 cycles against high-voltage NMC811 cathode, with a high Coulombic efficiency of 99.8%.
主要貢獻
1. 透過熱處理將PVDF-HFP和氟化聚醯亞胺(F-PI)結合，開發出新型複合凝膠聚合物電解質(GPE)，形成獨特的三維交聯結構，提升了熱穩定性和安全性能。
2. 發現創新的陰離子捕捉機制，F-PI中的醯胺鍵(N-H基團)通過強氫鍵作用捕捉FSI-陰離子，提升鋰離子傳輸效率，實現高達0.7的鋰離子遷移數。
3. 在無陽極鋰金屬電池(AFLMBs)中實現優異的循環穩定性，與高電壓NMC811正極配對時，經過100次循環後仍保持約70%的容量保持率，並達到99.8%的庫倫效率。
