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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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