All-solid-state Li metal batteries (ASSLMBs) have attracted significant attention because of their high energy density and improved safety. However, the poor stability at the Li anode/solid-state electrolyte (SSE) interface is a long-standing problem that limits the current density and capacity, thus hindering the practical application of ASSLMBs. Herein, fluorination of an Argyrodite Li₆PS₅Cl (LPSCl) sulfide electrolyte is proposed to enhance the interfacial stability toward the Li metal anode. Because of the condensed and highly fluorinated interface that forms in situ with a self-healing essence, the Li metal symmetric cell employing the fluorinated LPSCl SSE enables ultrastable Li plating/stripping over 250 h at a superhigh current density of 6.37 mA cm^–2 and a cutoff capacity of 5 mAh cm^–2. Furthermore, the Li metal treated by the fluorinated LPSCl SSE is demonstrated to deliver good durability and rate capability in full cells. Fluorinating sulfide electrolytes provides a new strategy for realizing high-performance ASSLMBs.

中文翻译：

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通过氟化电解质对全固态锂金属电池实现超稳定阳极界面

全固态锂金属电池（ASSLMB）由于其高能量密度和更高的安全性而备受关注。但是，锂阳极/固态电解质（SSE）界面的稳定性差是一个长期存在的问题，它限制了电流密度和容量，因此阻碍了ASSLMBs的实际应用。本文中，提出了对gy石Li ₆ PS ₅ Cl（LPSCl）硫化物电解质的氟化，以增强对Li金属阳极的界面稳定性。由于在原位形成的具有自修复本质的冷凝且高度氟化的界面，采用氟化LPSCl SSE的Li金属对称电池可在超高电流密度6.37 mA cm ^{–2的条件下}在250 h内实现超稳定的Li镀/剥离截止容量为5 mAh cm ^–2。此外，经氟化的LPSCl SSE处理的锂金属在全电池中表现出良好的耐久性和定速能力。氟化硫化物电解质为实现高性能ASSLMB提供了新的策略。