Highly Stable Plating/Stripping Behavior of Zinc Metal Anodes in Aqueous Zinc Batteries Regulated by Quaternary Ammonium Cationic Salts,ChemElectroChem

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Highly Stable Plating/Stripping Behavior of Zinc Metal Anodes in Aqueous Zinc Batteries Regulated by Quaternary Ammonium Cationic Salts
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-01-06 , DOI: 10.1002/celc.202001426
Qiliang Qiu ₁ , Xiaowei Chi ₁ , Jiaqi Huang ₁ , Yuexiu Du ₁ , Yu Liu ₂

Affiliation

Aqueous zinc‐ion batteries (AZIBs) have attracted wide attention as large‐scale energy storage systems, owing to their obvious merits such as high safety, low cost, and simple maintenance. However, the development of AZIBs is seriously hindered by Zn dendrite‐induced low efficiency, cell fading, and even cell short‐circuiting. Unlike the traditional anode modification strategies, this work stabilized the Zn anode by functionalizing the aqueous electrolyte with a series of quaternary ammonium cationic compounds. The cations of the compounds can be adsorbed on the surface of the metallic Zn during electrodeposition process, which alters the nucleation and deposition behavior of zinc ions according to the molecular structure of the cations. Tetraethyl ammonium bromide (TEAB) was, for the first time, demonstrated to guide homogeneous Zn deposition, thereby inhibiting the growth of dendrites in near‐neutral electrolytes. Highly reversible Zn stripping/plating performance with an average coulombic efficiency of 99.7 % is achieved. Particularly, the Zn−Zn symmetric cell based on TEAB‐containing electrolyte exhibits an ultra‐long cycling time of 3000 h at 1 mA cm⁻² and even 800 h at 5 mA cm⁻²; the Zn−MnO₂ full cell shows stable cycling under the condition of the practical‐level mass loading.

中文翻译：

季铵阳离子盐调节的水性锌电池中锌金属阳极的高度稳定电镀/剥离行为

锌离子水电池（AZIBs）具有诸如安全性高，成本低和维护简单等明显优点，因此已成为大规模储能系统引起了广泛关注。但是，锌枝晶诱导的低效率，电池褪色甚至电池短路严重阻碍了AZIBs的发展。与传统的阳极改性策略不同，这项工作通过使用一系列季铵阳离子化合物对水性电解质进行功能化来稳定Zn阳极。化合物的阳离子可以在电沉积过程中吸附在金属Zn的表面上，这会根据阳离子的分子结构改变锌离子的成核和沉积行为。首次证明四乙基溴化铵（TEAB）可以引导均匀的Zn沉积，从而抑制了近中性电解质中树枝状晶体的生长。实现了高度可逆的Zn剥离/镀覆性能，平均库仑效率为99.7％。特别是，基于含TEAB的电解质的Zn-Zn对称电池在1 mA cm处表现出3000 h的超长循环时间^-2甚至在5 mA cm ^-2时为800小时；Zn-MnO ₂满电池在实际质量负荷条件下显示出稳定的循环。

更新日期：2021-03-04

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