Long Shelf-Life Efficient Electrolytes Based on Trace l-Cysteine Additives toward Stable Zinc Metal Anodes,Small

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Long Shelf-Life Efficient Electrolytes Based on Trace l-Cysteine Additives toward Stable Zinc Metal Anodes
Small ( IF 13.0 ) Pub Date : 2022-08-08 , DOI: 10.1002/smll.202203674
Cong Huang ₁ , Xin Zhao ₁ , Yisu Hao ₁ , Yujie Yang ₁ , Yang Qian ₁ , Ge Chang ₁ , Yan Zhang ₁ , Qunli Tang ₁ , Aiping Hu ₁ , Xiaohua Chen ₁

Affiliation

The unstable anode/electrolyte interface (AEI) triggers the corrosion reaction and dendrite formation during cycling, hindering the practical application of zinc metal batteries. Herein, for the first time, l-cysteine (Cys) is employed to serve as an electrolyte additive for stabilizing the Zn/electrolyte interface. It is revealed that Cys additives tend to initially approach the Zn surface and then decompose into multiple effective components for suppressing parasitic reactions and Zn dendrites. As a consequence, Zn|Zn symmetric cells using trace Cys additives (0.83 mm) exhibit a steady cycle life of 1600 h, outperforming that of prior studies. Additionally, an average Coulombic efficiency of 99.6% for 250 cycles is also obtained under critical test conditions (10 mA cm⁻²/5 mAh cm⁻²). Cys additives also enable Zn–V₂O₅ and Zn–MnO₂ full cells with an enhanced cycle stability at a low N/P ratio. More importantly, Cys/ZnSO₄ electrolytes are demonstrated to be still effective after resting for half year, favoring the practical production.

中文翻译：

基于微量 l-半胱氨酸添加剂的长保质期高效电解质，用于稳定的锌金属阳极

不稳定的阳极/电解质界面（AEI）在循环过程中引发腐蚀反应和枝晶形成，阻碍了锌金属电池的实际应用。在此， L-半胱氨酸（Cys）首次被用作电解质添加剂以稳定锌/电解质界面。结果表明，Cys 添加剂最初倾向于接近 Zn 表面，然后分解成多种有效成分，以抑制寄生反应和 Zn 枝晶。因此，使用痕量 Cys 添加剂 (0.83 mm m ) 的 Zn|Zn 对称电池表现出 1600 小时的稳定循环寿命，优于之前的研究。此外，在临界测试条件（10 mA cm^-2 /5 mAh cm ^-2 )。Cys 添加剂还使 Zn-V ₂ O ₅和 Zn-MnO ₂全电池在低 N/P 比下具有增强的循环稳定性。更重要的是，Cys/ZnSO ₄电解质在静置半年后仍然有效，有利于实际生产。

更新日期：2022-08-08

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