Zhao Yunyu, Yu Yingjian
College of Physics Science and Technology, Kunming University, Kunming, Yunnan 650214, China.
College of Physics Science and Technology, Kunming University, Kunming, Yunnan 650214, China.
J Colloid Interface Sci. 2025 Jul 7;700(Pt 1):138369. doi: 10.1016/j.jcis.2025.138369.
Aqueous zinc metal batteries (AZMBs) are a promising alternative for next-generation secondary batteries owing to their high safety, low cost, and high electrical capacity. However, issues such as corrosion and dendrite growth on zinc anodes hinder the practical application of AZMBs. In this study, we developed two two-dimensional fluorine-rich covalent organic frameworks (COFs), TpFPa and TpFBD, as protective layers for the AZMB anode. The fluorine-rich hybrid interface composed of COFs@Zn and ZnF, produced during Zn electroplating, promoted Zn dissolution and homogenized the Zn flux. These effects effectively inhibited side reactions and Zn dendrite growth. In addition, the uniform and dense COFs prevented direct contact between Zn and the electrolyte, which improved the corrosion resistance of the zinc anode. Thus, the symmetric cells assembled using COFs@Zn demonstrated a stable cycle performance of over 1680 h at 1 mA cm@1 mAh cm, which significantly surpassed the performance of bare zinc symmetric batteries. In addition, full cells protected by COFs maintained an ultra-long cycle stability of over 3500 cycles at 2 A g. This strategy of developing a fluorinated artificial interface layer represents a promising approach for designing high-performance AZMBs.
水系锌金属电池（AZMBs）因其高安全性、低成本和高电容量，是下一代二次电池的一个有前景的替代方案。然而，锌负极上的腐蚀和枝晶生长等问题阻碍了AZMBs的实际应用。在本研究中，我们开发了两种二维富氟共价有机框架（COFs），即TpFPa和TpFBD，作为AZMB负极的保护层。在锌电镀过程中产生的由COFs@Zn和ZnF组成的富氟混合界面促进了锌的溶解并使锌通量均匀化。这些作用有效地抑制了副反应和锌枝晶的生长。此外，均匀致密的COFs阻止了锌与电解质的直接接触，提高了锌负极的耐腐蚀性。因此，使用COFs@Zn组装的对称电池在1 mA cm@1 mAh cm下表现出超过1680小时的稳定循环性能，显著超过了裸锌对称电池的性能。此外，由COFs保护的全电池在2 A g下保持了超过3500次循环的超长循环稳定性。这种开发氟化人工界面层的策略是设计高性能AZMBs的一种有前景的方法。
