▌Two-Step Activations and Liquid Metal Fortified Copper Substrate on Corrosion Tolerance in Anode-Free Lithium–Sulfur Battery
兩步活化與液態金屬強化銅集流體提升無負極鋰硫電池之腐蝕耐受性。
B. W. Taklu, T. I. Yeh, C. Y. Chang, T. M. Hagos, Y. Nikodimos, S. A. Vallal, A. Windmüller, C. C. Chang, K. N. Shitaw, T. Agnihotri, R. Hasan, Z. B. Muche, Y. C. Huang, S. C. Yang, W. N. Su* and B. J. Hwang*
https://doi.org/10.1021/acsenergylett.5c03183
SEED Member: B. J. Hwang, W. N. Su
Major Contributions
1. A GaIn liquid metal coating on Cu current collector provides self-healing properties, uniform Li nucleation sites, and corrosion protection against polysulfide (PS) attack, overcoming Cu corrosion and Cu₂S formation confirmed by synchrotron XAS.
2. Operando heat evolution, confocal optical microscopy, and in situ XRD demonstrate that GaIn-Cu-CC suppresses dendrite growth and the alloy–dealloying mechanism, improving Li reversibility in anode-free Li–S batteries.
3. Two-step activation (TSA) of the Li₂S cathode on GaIn-Cu-CC achieves 50.11% capacity retention after 250 cycles, significantly outperforming bare Cu-CC (33.15% after 100 cycles).
主要貢獻
1. 在銅集流體上塗覆 GaIn 液態金屬提供自癒合特性、均勻 Li 成核位點及多硫化物腐蝕防護，克服 Cu 腐蝕與同步輻射 XAS 確認的 Cu₂S 形成問題。
2. 原位熱演化測試、共焦光學顯微術與原位 XRD 證明 GaIn-Cu 集流體可抑制枝晶生長與合金化/去合金化機制，提升無負極鋰硫電池中 Li 的可逆性。
3. 在 GaIn-Cu 集流體上對 Li₂S 正極進行兩步活化可在 250 次循環後保持 50.11% 容量，顯著優於裸 Cu（100 次循環後僅 33.15%）。
