College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, P. R. China.
Small. 2022 Sep;18(37):e2203674. doi: 10.1002/smll.202203674. Epub 2022 Aug 8.
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 /5 mAh cm ). Cys additives also enable Zn-V O and Zn-MnO full cells with an enhanced cycle stability at a low N/P ratio. More importantly, Cys/ZnSO electrolytes are demonstrated to be still effective after resting for half year, favoring the practical production.
不稳定的正极/电解液界面（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，首次将半胱氨酸（Cys）用作电解液添加剂来稳定 Zn/电解液界面。研究表明，Cys 添加剂倾向于首先接近 Zn 表面，然后分解为多种有效成分，以抑制寄生反应和 Zn 枝晶的形成。因此，使用痕量 Cys 添加剂（0.83mm）的 Zn|Zn 对称电池表现出稳定的 1600 小时循环寿命，优于先前的研究。此外，在苛刻的测试条件（10mAcm/5mAhcm）下，经过 250 次循环后还可获得平均库仑效率为 99.6%。Cys 添加剂还可使 Zn-VO 和 Zn-MnO 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 电解液在静置半年后仍然有效，有利于实际生产。
