The unavoidable dendrite growth and side reactions are two major issues that lead to unsatisfactory cycling stability of the Zn metal anode and premature battery failure, which constrains the wide practical application of aqueous Zn-ion batteries. Herein, a bilayered zinc fluoride–indium interface-modified zinc anode (ZnF₂–In@Zn) is in situ-constructed to solve these two issues through a simple solution-dipping strategy. The outer ZnF₂ layer assures sufficient desolvation of hydrated Zn²⁺ and even Zn²⁺ flux; meanwhile, the interior In layer further contributes to the uniform distribution of the electric field and lower energy barrier of Zn²⁺ nucleation, achieving dendrite-free and side reaction-free Zn deposition. With synergistic regulation from the bilayered composite interface, the ZnF₂–In@Zn anode exhibits outstanding cycling stability (over 4200 h at 1 mA cm^–2), achieving a cumulative capacity of over 5250 mAh cm^–2 even under a high current density of 5 mA cm^–2. This work proposes an advanced understanding of reasonable interface engineering for tackling multiple challenges faced by metal anodes.

中文翻译：

---

通过双层无机金属界面层实现高度可逆的无枝晶锌阳极


不可避免的枝晶生长和副反应是导致 Zn 金属负极循环稳定性不理想和电池过早失效的两大问题，这限制了水性 Zn 离子电池的广泛实际应用。在此，原位构建了双层氟化锌-铟界面修饰的锌阳极 （ZnF₂–In@Zn），以通过简单的溶液浸渍策略解决这两个问题。外层 ZnF₂ 层确保水合 Zn²⁺ 甚至 Zn²⁺ 助焊剂充分脱溶剂;同时，内部 In 层进一步有助于电场的均匀分布和降低 Zn²⁺ 成核的能垒，实现无枝晶和无副反应的 Zn 沉积。在双层复合界面的协同调节下，ZnF₂–In@Zn 负极表现出出色的循环稳定性（在 1 mA cm^–2 下超过 4200 小时），即使在 5 mA cm^–2 的高电流密度下也能实现超过 5250 mAh cm^–2 的累积容量。这项工作提出了对合理界面工程的高级理解，以应对金属阳极面临的多重挑战。