Major Contributions

1.Innovative Dual-Coating Protective Layer Design
We developed a groundbreaking dual-coating protective layer for AFLMBs, consisting of a Sn-coated Cu substrate (Cu-Sn) as the bottom layer and a SrF₂ nanoparticle-reinforced PVDF-HFP polymer as the top layer. This design significantly enhances uniform lithium deposition and suppresses dendrite growth, solving key challenges in AFLMBs. The dual-layer structure also promotes the formation of a LiF-rich solid electrolyte interphase (SEI), which facilitates lithium-ion transport while preventing electron flow.

2.Enhanced Cycling Stability and Interface Engineering
Our dual-layer approach not only stabilizes the electrode interface but also enables long-term cycling stability. The Cu-Sn@SFPH electrode demonstrated remarkable performance, with over 3,200 hours of stable cycling at a capacity of 2 mAh cm⁻². The integration of lithiophilic Li-Sn and Li-Sr alloy layers acts as nucleation seeds for uniform lithium deposition, further improving the electrochemical stability of the system.

3.Practical Application in High-Performance Pouch Cells
We successfully applied our design in anode-free pouch cells using NCM111 cathodes under real-world conditions with lean electrolyte volumes. These cells retained 72.1% capacity after 120 cycles and achieved an average Coulombic efficiency of 99.9%, demonstrating the practical viability of our approach for high-energy-density battery applications.


主要貢獻

1.創新雙層保護結構設計
我們設計了一種創新的雙層保護結構，用於無陽極鋰金屬電池（AFLMBs），包括錫塗覆銅基底（Cu-Sn）作為底層，以及含鍶氟化物（SrF₂）奈米顆粒和PVDF-HFP聚合物的頂層。這種設計顯著改善了鋰沉積的均勻性，並有效抑制鋰枝晶的生長，解決了AFLMBs中鋰枝晶生長和界面不穩定的主要挑戰。

2.提升電化學穩定性與鋰沉積均勻性
我們的雙層結構促進了富含LiF的固態電解質界面（SEI）的形成，該界面在循環過程中加速了鋰離子的傳輸，同時限制電子流動。此外，Cu-Sn和Li-Sr合金層提供了均勻鋰沉積的成核位點，顯著提高了電極的循環穩定性。我們的Cu-Sn@SFPH電極在2 mAh cm⁻²容量下，展現出超過3200小時的穩定循環性能。

3.實際應用中的卓越表現
在實際應用條件下，我們將該設計應用於使用NCM111正極和Cu-Sn@SFPH負極的無陽極袋式電池中。這些電池在120次循環後仍能保持72.1%的容量，且庫倫效率高達99.9%。這表明我們的策略在低電解液量條件下具有實用潛力，有望推動高能量密度儲能設備的發展。