Hu Nan, Qin Hongyu, Chen Xiangyou, Huang Yanping, Xu Jing, He Huibing
School of Chemistry and Chemical Engieering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, China.
Front Chem. 2022 Aug 10;10:981623. doi: 10.3389/fchem.2022.981623. eCollection 2022.
Aqueous zinc-ion batteries (AZIBs) have attracted extensive attention because of their eco-friendliness, intrinsic safety, and high theoretical capacity. Nevertheless, the long-standing Zn anode issues such as dendrite growth, hydrogen evolution, and passivation greatly restrict the further development of AZIBs. Herein, a metal-chelate interphase with high Zn affinity is constructed on the Zn metal surface (TA@Zn) via dipping metallic Zn into a tannic acid (TA) solution to address the aforementioned problems. Benefiting from the abundant hydrophilic and zincophilic phenolic hydroxyl groups of TA molecules, the metal-chelate interphase shows strong attraction for Zn ions, guiding uniform zinc deposition as well as decreasing Zn migration barrier. Therefore, the TA@Zn anode displays an extended lifespan of 850 h at 1 mA cm-, 1 mAh cm in the Zn|Zn symmetrical cell, and a high Coulombic efficiency of 96.8% in the Zn|Ti asymmetric cell. Furthermore, the Zn|VO full cell using TA@Zn anode delivers an extremely high capacity retention of 95.9% after 750 cycles at 2 A g-. This simple and effective strategy broadens the interfacial modification scope on Zn metal anodes for advanced rechargeable Zn metal batteries.
水系锌离子电池（AZIBs）因其环保、本质安全和高理论容量而受到广泛关注。然而，长期存在的锌负极问题，如枝晶生长、析氢和钝化，极大地限制了水系锌离子电池的进一步发展。在此，通过将金属锌浸入单宁酸（TA）溶液中，在锌金属表面构建了一种对锌具有高亲和力的金属螯合界面（TA@Zn），以解决上述问题。得益于TA分子丰富的亲水性和亲锌性酚羟基，金属螯合界面表现出对锌离子的强吸引力，引导锌均匀沉积并降低锌迁移势垒。因此，TA@Zn负极在锌|锌对称电池中，在1 mA cm-2、1 mAh cm-2的条件下显示出850小时的延长寿命，在锌|钛不对称电池中具有96.8%的高库仑效率。此外，使用TA@Zn负极的锌|钒全电池在2 A g-1的电流下循环750次后，具有95.9%的极高容量保持率。这种简单有效的策略拓宽了用于先进可充电锌金属电池的锌金属负极的界面改性范围。
