Metallic Zn is an appealing anode for aqueous Zn-ion batteries, but it suffers from corrosion and Zn dendrites. In this work, we develop a nonstoichiometric silicon nitride (SiN_x) film with specific defect sites, i.e., Si dangling bonds (Si DBs), to modify the surface property and thus to enhance the stability of Zn anodes. The Si DBs, together with zincophilic N sites with strong Zn affinity, are able to uniformly distribute Zn²⁺ ions on the anodes, enabling an even Zn deposition. Meanwhile, the electrochemically inert SiN_x films can also suppress the side reactions to achieve a high Coulombic efficiency. As a result, the SiN_x@Zn symmetrical battery possesses a long lifespan of more than 4600 h at 1 mA cm^–2. Our work highlights the importance of defect engineering of protective layers in inhibiting the uncontrollable growth of Zn dendrites for constructing high-performance Zn anodes.

中文翻译：

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SiNx 保护涂层的同时悬挂键和亲锌位点工程朝向稳定的锌阳极

金属锌是一种很有吸引力的水系锌离子电池阳极，但它存在腐蚀和锌枝晶的问题。在这项工作中，我们开发了一种具有特定缺陷位点的非化学计量氮化硅 (SiN _x ) 薄膜，即 Si 悬空键 (Si DB)，以改变表面特性，从而提高 Zn 阳极的稳定性。Si DB 与具有强 Zn 亲和力的亲锌 N 位点一起，能够在阳极上均匀分布 Zn ^{2+离子，从而实现均匀的 Zn 沉积。}同时，电化学惰性的SiN _x薄膜还可以抑制副反应以实现高库仑效率。因此，SiN _x ^{@Zn 对称电池在 1 mA cm –2}下具有超过 4600 小时的长寿命. 我们的工作强调了保护层缺陷工程在抑制锌枝晶不可控生长以构建高性能锌阳极方面的重要性。