Li alloy film has been developed as an advanced artificial protection layer on Li metal anode, attributed to its tight contact with Li metal and unique transportation capability of mixed ion/electron. Li⁺ diffusion coefficient of the alloy interphase layer is crucial for Li dendrite growth and rate performance. Here, Zn thin film is sputtered on the surface of Li foil, and Li−Zn alloy buffer layer is spontaneously formed via an alloying reaction. In the process of electrochemical cycling, while Li⁺ ions are reduced on the interface of the electrolyte and the anode, the fresh Li atoms rapidly diffuse into the alloy layer via fast ion transport channels of the mixed conductor, resulting in the formation of Li metal free surface. As a consequence, Li−Zn layer protected Li electrode can effectively suppress Li dendrite growth and mitigate the deterioration of Li metal, demonstrating the greatly promoted performance at high current density in both the liquid electrolyte and all solid‐state electrolyte systems.

中文翻译：

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Li-Zn合金保护层的快速Li +传输，可实现出色的Li金属阳极电化学性能

锂合金膜已被开发为锂金属阳极上的高级人工保护层，这归因于其与锂金属的紧密接触以及独特的混合离子/电子传输能力。Li ⁺合金相间层的扩散系数对于Li枝晶的生长和倍率性能至关重要。在此，将Zn薄膜溅射在Li箔的表面上，并通过合金化反应自发形成Li-Zn合金缓冲层。在电化学循环过程中，Li ⁺离子在电解质和阳极的界面上还原，新鲜的Li原子通过混合导体的快速离子传输通道迅速扩散到合金层中，从而形成无Li金属的表面。结果，Li-Zn层保护的Li电极可以有效地抑制Li树枝状晶体的生长并减轻Li金属的劣化，这证明了在液态电解质和所有固态电解质系统中，在高电流密度下，其性能都有很大提高。