All‐solid‐state metal batteries (ASSMBs) are attracting much attention due to their cost effectiveness, enhanced safety, room‐temperature performance and high theoretical specific capacity. However, the alkali metal anodes (such as Li and Na) are active enough to react with most solid‐state electrolytes (SSEs), leading to detrimental reactions at the metal–SSE interface. In this work, a molecular layer deposition (MLD) alucone film is employed to stabilize the active Na anode/electrolyte interface in the ASSMBs, limiting the decomposition of the sulfide‐based electrolytes (Na₃SbS₄ and Na₃PS₄) and Na dendrite growth. Such a strategy effectively improves the room‐temperature full battery performance as well as cycling stability for over 475 h in Na–Na symmetric cells. The modified interface is further characterized by X‐ray photoelectron spectroscopy (XPS) depth profiling, which provides spatially resolved evidence of the synergistic effect between the dendrite‐suppressed sodiated alucone and the insulating unsodiated alucone. The coupled layers reinforce the protection of the Na metal/electrolyte interface. Therefore, alucone is identified as an effective and bifunctional coating material for the enhancement of the metal/electrolyte interfacial stability, paving the way for rapid development and wide application of high‐energy ASSMBs.

中文翻译：

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逐步添加的Alucone作为固态Na金属电池的界面稳定策略

全固态金属电池（ASSMB）由于其成本效益，增强的安全性，室温性能和较高的理论比容量而备受关注。但是，碱金属阳极（例如Li和Na）的活性足以与大多数固态电解质（SSE）反应，从而导致金属-SSE界面发生有害反应。在这项工作中，采用分子层沉积（MLD）的Alucone膜来稳定ASSMB中的活性Na阳极/电解质界面，从而限制了硫化物基电解质（Na ₃ SbS ₄和Na ₃ PS ₄）和钠枝晶生长。这种策略有效地改善了室温下充满电池的性能以及Na–Na对称电池中超过475小时的循环稳定性。修改后的界面进一步通过X射线光电子能谱（XPS）深度剖析进行了表征，该剖析提供了空间分辨的证据，证明了树突抑制的磺胺酮和绝缘的非磺胺酮之间的协同作用。耦合层加强了对Na金属/电解质界面的保护。因此，人们认为，Alucone是一种有效的双功能涂层材料，可增强金属/电解质界面的稳定性，为快速开发和广泛应用高能ASSMB铺平了道路。