With advantages including high capacity, intrinsic safety and low cost, aqueous zinc‐ion batteries (AZIBs) are ideal electrochemical energy storage devices for large‐scale and portable energy storage. However, the development of AZIBs suffers from tricky challenges, such as the notorious Zn dendrite growth and severe parasitic reactions. Herein, as a low‐cost and nontoxic biomass, agar is adopted to construct an interface layer on Zn foil to mitigate side reactions and induce uniform Zn deposition on Zn anodes. The interaction between Zn2+ and polar functional groups of agar can regulate Zn2+ distribution and promote Zn2+ desolvation, thus simultaneously achieving homogenous Zn deposition and suppressed hydrogen evolution reaction. Meanwhile, SO42− anions are blocked from contacting Zn surface due to electrostatic repulsion, greatly restraining corrosion and passivation. Consequently, Zn||A‐Cu asymmetric cell operates normally for 590 cycles with an average coulombic efficiency of 99.5%, suggesting good reversibility of Zn plating/stripping. Notably, A‐Zn symmetric cell exhibits a long lifespan of 1100 h at 2 mA cm−2. Furthermore, the A‐Zn||NVO full cell displays a superb capacity retention of 94.8% after 3600 cycles at 5 A g−1. This work offers a novel interface modification method for constructing stable and dendrite‐free anodes of AZIBs.

中文翻译：

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用于抑制高性能水性锌离子电池寄生反应的琼脂基界面

水性锌离子电池（AZIB）具有高容量、本质安全和低成本等优点，是大规模、便携式储能的理想电化学储能装置。然而，AZIBs的发展面临着棘手的挑战，例如臭名昭​​著的锌枝晶生长和严重的寄生反应。在此，琼脂作为一种低成本、无毒的生物质，被用来在锌箔上构建界面层，以减轻副反应并诱导锌阳极上均匀的锌沉积。 Zn2+与琼脂极性官能团之间的相互作用可以调节Zn2+分布并促进Zn2+去溶剂化，从而同时实现均匀的Zn沉积和抑制析氢反应。同时，由于静电斥力，SO42−阴离子被阻止与Zn表面接触，极大地抑制了腐蚀和钝化。因此，Zn||A-Cu 不对称电池正常运行 590 个周期，平均库仑效率为 99.5%，表明镀锌/剥离具有良好的可逆性。值得注意的是，A-Zn 对称电池在 2 mA cm−2 下表现出 1100 小时的长寿命。此外，A-Zn||NVO 全电池在 5 A g−1 下循环 3600 次后显示出 94.8% 的优异容量保持率。这项工作为构建稳定且无枝晶的 AZIB 阳极提供了一种新颖的界面修饰方法。