The application of lithium metal batteries (LMBs) is greatly inhibited by the uncontrollable growth of Li metal dendrites and the consequent safety hazards. Herein, we introduce AgSO₃CF₃ and LiNO₃ into the electrolyte to form a stable mixed conductive interphase (MCI) layer on Li metal via in-situ surface reaction. Upon the surface reaction, ultrafine Ag nanoparticles uniformly formed on the Li surface that effectively seed dendrite-free lithium deposition. Besides, the SO₃CF₃⁻ and NO₃⁻ anions in the solvation shell of Li⁺ can be reduced to produce an Ag-LiF-Li₃N rich interface layer. The as-obtained uniform and robust layer renders a smooth Li morphology and fast interfacial kinetics. Therefore, Li||Li symmetrical cell exhibits a long lifespan over 2000 hours with an ultralow overpotential, and Li||LiFePO₄ full cell maintains capacity retention of ∼85% after 1100 cycles. The strategy proposed here opens a new avenue for addressing dendrite issues and makes the application of lithium metal batteries feasible.

锂金属枝晶的不可控生长以及随之而来的安全隐患极大地抑制了锂金属电池（LMBs）的应用。在此，我们将 AgSO ₃ CF ₃和 LiNO _{3引入电解液中，通过}原位表面反应在锂金属上形成稳定的混合导电界面 (MCI) 层。在表面反应后，超细银纳米颗粒均匀地形成在锂表面上，有效地为无枝晶锂沉积提供了种子。^{此外，Li +}的溶剂化壳层中的 SO ₃ CF ₃ ^-和 NO ₃ ^-阴离子可以被还原生成 Ag-LiF-Li ₃N 丰富的接口层。所获得的均匀且坚固的层呈现出光滑的锂形态和快速的界面动力学。因此，Li||Li 对称电池具有超过 2000 小时的超低过电位的超长寿命，而 Li||LiFePO ₄全电池在 1100 次循环后仍保持约 85% 的容量保持率。这里提出的策略为解决枝晶问题开辟了一条新途径，并使锂金属电池的应用成为可能。