Huang Yang, Zhuang Yuexin, Guo Li, Lei Chongjia, Jiang Yue, Liu Zhenjie, Zhao Yuzhen, Xing Kangqian, Wu Xiangrong, Luo Shaojuan, Chen Guangming, Liu Zhuoxin, Hu Zhe
College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518055, P. R. China.
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, P. R. China.
Small. 2024 Mar;20(10):e2306211. doi: 10.1002/smll.202306211. Epub 2023 Oct 24.
The stability of aqueous Zn-ion batteries (AZIBs) is detrimentally influenced by the formation of Zn dendrites and the occurrence of parasitic side reactions at the Zn metal anode (ZMA)-electrolyte interface. The strategic manipulation of the preferential crystal orientation during Zn plating serves as an essential approach to mitigate this issue. Here, Zn aspartate (Zn-Asp), an electrolyte additive for AZIBs, is introduced not only to optimize the solvation structure of Zn , but also to crucially promote preferential Zn plating on the (002) crystal plane of ZMA. As a result, both side reactions and Zn dendrites are effectively inhibited, ensuring an anode surface free of both dendrites and by-products. The implementation of Zn-Asp leads to significant enhancements in both Zn||Zn symmetric and Zn||Ti batteries, which demonstrate robust cyclability of over 3200 h and high Coulombic efficiency of 99.29%, respectively. Additionally, the Zn||NaV O ·1.5H O full battery exhibits remarkable rate capability, realizing a high capacity of 240.77 mA h g at 5 A g , and retains 92.7% of its initial capacity after 1000 cycles. This research underscores the vital role of electrolyte additives in regulating the preferential crystal orientation of ZMA, thereby contributing to the development of high-performing AZIBs.
水系锌离子电池（AZIBs）的稳定性受到锌枝晶的形成以及锌金属阳极（ZMA）-电解质界面处寄生副反应发生的不利影响。在锌电镀过程中对优先晶体取向进行策略性调控是缓解这一问题的重要方法。在此，引入天冬氨酸锌（Zn-Asp）作为AZIBs的电解质添加剂，不仅用于优化锌的溶剂化结构，还至关重要地促进在ZMA的（002）晶面上优先镀锌。结果，副反应和锌枝晶均得到有效抑制，确保阳极表面无枝晶和副产物。Zn-Asp的应用使Zn||Zn对称电池和Zn||Ti电池均有显著提升，分别展现出超过3200小时的稳健循环稳定性和99.29%的高库仑效率。此外，Zn||NaVO₃·1.5H₂O全电池表现出卓越的倍率性能，在5 A g⁻¹时实现了240.77 mA h g⁻¹的高容量，并在1000次循环后保持其初始容量的92.7%。本研究强调了电解质添加剂在调节ZMA优先晶体取向方面的关键作用，从而有助于高性能AZIBs的发展。
