Cao Jin, Zhang Dongdong, Chanajaree Rungroj, Yue Yilei, Zhang Xinyu, Yang Xuelin, Cheng Chong, Li Shuang, Qin Jiaqian, Zhou Jiang, Zeng Zhiyuan
College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China.
Department of Materials Science and Engineering and State Key Laboratory of Marine Pollution, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong 999077, China.
ACS Appl Mater Interfaces. 2023 Sep 27;15(38):45045-45054. doi: 10.1021/acsami.3c10773. Epub 2023 Sep 14.
The zinc dendrites and side reactions formed on the zinc anode have greatly hindered the development of aqueous zinc-ion batteries (ZIBs). Herein, we introduce tannic acid (TA) as an additive in the ZnSO (ZSO) electrolyte to enhance the reversible Zn plating/stripping behavior. TA molecules are found to adsorb onto the zinc surface, forming a passivation layer and replacing some of the HO molecules in the Zn solvation sheath to form the [Zn(HO)TA] complex; this process effectively prevents side reactions. Moreover, the lower desolvation energy barrier of the [Zn(HO)TA] structure facilitates uniform Zn metal deposition and enables a stable plating/stripping lifespan of 2500 h with low voltage hysteresis (53 mV at 0.5 mA cm) as compared to the ZSO electrolyte (167 h and 104 mV). Additionally, the incorporation of the MnO cathode in the TA + ZSO electrolyte shows improved cycling capacity retention, from 64% (ZSO) to 85% (TA + ZSO), after 250 cycles at 1 A g, demonstrating the effectiveness of the TA additive in enhancing the performance of ZIBs.
锌阳极上形成的锌枝晶和副反应极大地阻碍了水系锌离子电池（ZIBs）的发展。在此，我们在ZnSO₄（ZSO）电解液中引入单宁酸（TA）作为添加剂，以增强锌的可逆电镀/剥离行为。研究发现，TA分子吸附在锌表面，形成钝化层，并取代锌溶剂化鞘层中的一些H₂O分子，形成[Zn(H₂O)₄TA]络合物；这一过程有效地防止了副反应。此外，[Zn(H₂O)₄TA]结构较低的去溶剂化能垒有助于锌金属均匀沉积，并实现2500小时的稳定电镀/剥离寿命，与ZSO电解液（167小时和104 mV）相比，具有较低的电压滞后（在0.5 mA cm²时为53 mV）。此外，在TA + ZSO电解液中加入MnO₂阴极，在1 A g⁻¹下循环250次后，循环容量保持率从64%（ZSO）提高到85%（TA + ZSO），证明了TA添加剂在提高ZIBs性能方面的有效性。
