Chen Ruwei, Zhang Gengyuan, Zhou Hujing, Li Jianrong, Li Jiangtao, Chung Lai-Hon, Hu Xuanhe, He Jun
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China.
Small. 2024 Feb;20(8):e2305687. doi: 10.1002/smll.202305687. Epub 2023 Oct 15.
Aqueous zinc ion batteries (ZIBs) hold great promise for large-scale energy storage; however, severe zinc dendritic growth and side reactions on the anode dramatically impede their commercial application. Herein, a Zr-based MOF (UiO-66) functionalized with a high density of sulfonic acid (─SO H) groups is used to modify the glass fiber (GF) separator of ZIBs, providing a unique solution for stabilizing Zn anode. Benefiting from the strong interaction between zincophilic -SO H and Zn , this sulfonate-rich UiO-66 modified GF (GF@UiO-S2) separator not only guarantees the homogeneous distribution of ion flux, but also accelerates the ion migration kinetics. Hence, the GF@UiO-S2 separator promotes uniform Zn plating/stripping on the Zn anode and facilitates the desolvation of hydrated Zn ions at the interface, which helps guide dendrite-free Zn deposition and inhibit undesired side reactions. Accordingly, the Zn||Zn symmetric cell with this separator achieves excellent cycling stability with a long cycle life exceeding 3450 h at 3 mA cm . Besides, the Zn||MnO full cell paired with this separator delivers remarkable cyclability with 90% capacity retention after 1200 cycles. This design of metal-organic frameworks functionalized separators provides a new insight for constructing highly robust ZIBs.
水系锌离子电池（ZIBs）在大规模储能方面具有巨大潜力；然而，阳极上严重的锌枝晶生长和副反应极大地阻碍了它们的商业应用。在此，一种用高密度磺酸（─SO₃H）基团功能化的锆基金属有机框架（UiO-66）被用于修饰ZIBs的玻璃纤维（GF）隔膜，为稳定锌阳极提供了一种独特的解决方案。得益于亲锌的─SO₃H与Zn²⁺之间的强相互作用，这种富含磺酸盐的UiO-66修饰的GF（GF@UiO-S2）隔膜不仅保证了离子通量的均匀分布，还加速了离子迁移动力学。因此，GF@UiO-S2隔膜促进了锌阳极上锌的均匀电镀/剥离，并促进了界面处水合锌离子的去溶剂化，这有助于引导无枝晶的锌沉积并抑制不期望的副反应。相应地，使用这种隔膜的Zn||Zn对称电池在3 mA cm⁻²下实现了出色的循环稳定性，循环寿命超过3450小时。此外，与这种隔膜配对的Zn||MnO₂全电池具有显著的循环性能，在1200次循环后容量保持率为90%。这种金属有机框架功能化隔膜的设计为构建高度稳健的ZIBs提供了新的见解。
