A low-cost and non-corrosive electropolishing strategy for long-life zinc metal anode in rechargeable aqueous battery
A low-cost and non-corrosive electropolishing strategy for long-life zinc metal anode in rechargeable aqueous battery
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DOI：
10.1016/j.ensm.2022.01.016
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发表时间：
2022-01
影响因子：
20.4
通讯作者：
Ruijie Zhu;Zetao Xiong;Huijun Yang;T. Huang;Seongwoon Jeong;D. Kowalski;Sho Kitano;Y. Aoki;H. Habazaki;Chunyu Zhu
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文献类型：
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作者：
Ruijie Zhu;Zetao Xiong;Huijun Yang;T. Huang;Seongwoon Jeong;D. Kowalski;Sho Kitano;Y. Aoki;H. Habazaki;Chunyu Zhu
可充锌水溶液电池由于其固有的安全性和经济性而引起了人们的极大兴趣。然而，不可控的锌枝晶形成在水性电解质限制其可逆性的长寿命应用。原始锌表面的凸起或钝化层是大量锌晶体聚集和不均匀锌电沉积的核心。在这里，我们第一次展示了一种简单，有效，无腐蚀性的电解抛光策略，以开发一个光滑，清洁的锌金属相比，繁重和不可靠的机械抛光方法在实验室规模的研究。在去除原始钝化层后，新鲜的Zn阳极可以在40 mA cm− 2的高电流密度下存活6000次以上。此外，电抛光后的锌电极具有更稳定可靠的电化学行为，这将有助于后续研究锌电沉积机理和阐明保护策略的有效性。
Rechargeable aqueous zinc (Zn) batteries have attracted great interests because of its inherent safety and cost-effectiveness. However, the uncontrollable Zn dendrite formation in aqueous electrolyte restricts its reversibility for long-life application. The bulge or passivation layer in pristine Zn surface serves as nuclei for large amount of Zn crystal aggregation and inhomogeneous Zn electrodeposition. Here, for the first time, we demonstrate a simple, effective, and non-corrosive electropolishing strategy to develop a smooth and clean Zn metal as compared with burdensome and unreliable mechanical polishing method in lab-scale research. After removing the primitive passivation layer, the fresh Zn anode can survive at a high current density of 40 mA cm−2over 6000 times. Moreover, the electropolished Zn gains more consistent and reliable electrochemical behaviors which contributes to study the mechanism of Zn electrodeposition and clarify the effectiveness of protective strategies in the follow research.