Abstract

The unstable zinc anode/electrolyte interface induced by corrosion, interfacial water splitting reaction, and dendrite growth seriously degrades the performances of metal Zn anode in aqueous electrolyte. Herein, the nucleation and growth of zinc hydroxide sulfate (ZHS), an interfacial by-product, has been tailored by Tween 80 in the electrolyte, which thereby assists in in-situ forming a dense solid electrolyte interphase (SEI) with small-sized ZHS and evenly distributed Tween 80. This SEI has high corrosion resistance and uniform distribution of zinc ions, which not only contributes to blocking the interfacial side reactions but also induces stable and calm zinc plating/stripping. Consequently, the modified electrolyte can confer the assembled Zn∥Zn symmetric cell with a stable operation life over 1500 h at 1 mA·cm⁻² and 1 mAh·cm⁻² as well as the practical Zn∥NH₄V₄O₁₀ full battery with a high-rate capacity of 120 mAh·g⁻¹ at the current density of 5 A·g⁻¹. This work provides a way for regulating and reusing interfacial by-products, and a new sight on stabilization electrodes/electrolyte interfaces.

中文翻译：

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调整结晶氢氧化锌硫酸盐的生长以实现稳定的锌沉积化学

摘要

由腐蚀、界面水分解反应和枝晶生长引起的不稳定的锌阳极/电解质界面严重降低了金属锌阳极在水性电解质中的性能。其中，界面副产物氢氧化硫酸锌 (ZHS) 的成核和生长是通过电解质中的 Tween 80 进行定制的，从而有助于原位形成具有小尺寸的致密固体电解质界面 (SEI)。 ZHS和均匀分布的Tween 80。该SEI具有高耐腐蚀性和锌离子分布均匀，不仅有助于阻止界面副反应，而且能诱导稳定、平静的镀/剥锌。因此，改进的电解质可以赋予组装的Zn∥Zn对称电池在1 mA·cm ^-2和1 mAh·cm ^-2下稳定运行超过1500 h的寿命以及实用的Zn∥NH ₄ V ₄ O ₁₀全电池。电池在5A·g ^-1的电流密度下具有120mAh·g ^-1的高倍率容量。这项工作提供了一种调节和再利用界面副产物的方法，以及稳定电极/电解质界面的新视角。