Both high reversibility and cycle stability for zinc anode are desirable for practical applications. However, it is a challenge to obtain both due to severe hydrogen evolution, corrosion and pH fluctuation. Here, a trace-amount additive (0.1 wt%), ammonium succinate, is proposed to effectively suppress the above issues. The additive with high zinc absorbability not only participates in the Zn²⁺ solvation shell, reducing H₂O activity in the solvation shell but also forms an adsorption layer to inhibit corrosion and regulate ion flux for uniform deposition. More importantly, the strong pH buffering ability enabled by NH₄⁺ endows batteries with high cycle stability. Therefore, an unprecedentedly high average coulombic efficiency of 99.91% at 1 mA cm⁻² was obtained, and the symmetrical cell could stably cycle with a high cumulative capacity of 6150 mA h cm⁻² at 10 mA cm⁻², demonstrating the feasibility for both high reversibility and cycle stability for zinc anode.

中文翻译：

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高度可逆的锌阳极，由具有 pH 缓冲能力的痕量添加剂实现


锌负极的高可逆性和循环稳定性都是实际应用的理想选择。然而，由于严重的析氢、腐蚀和 pH 值波动，要同时获得两者是一项挑战。在这里，提出了一种痕量添加剂 （0.1 wt%） 琥珀酸铵，以有效抑制上述问题。具有高锌吸收性的添加剂不仅参与 Zn²⁺ 溶剂化壳层，降低溶剂化壳层中的 H₂O 活性，还形成吸附层以抑制腐蚀并调节离子通量以实现均匀沉积。更重要的是，NH₄⁺ 实现的强大 pH 缓冲能力赋予了电池高循环稳定性。因此，在 1 mA ^cm-2 处获得了前所未有的 99.91% 的平均库仑效率，对称电池可以在 10 mA ^cm-2 下以 6150 mA h ^cm-2 的高累积容量稳定循环，证明了锌负极高可逆性和循环稳定性的可行性。