Li Shiying, Fu Jing, Miao Guoxing, Wang Shengping, Zhao Wanyu, Wu Zichen, Zhang Yijie, Yang Xiaowei
School of Materials Science and Engineering, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, 201804, China.
Department of Electrical and Computer Engineering and Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, N2L3G1, Canada.
Adv Mater. 2021 May;33(21):e2008424. doi: 10.1002/adma.202008424. Epub 2021 Apr 19.
The propensity of Zn-metal anodes to form non-uniform or dendritic electrodeposits is bound up with the nature of the electrode surface. However, the effect of surface structure on the inherent nucleation and deposition of Zn is not yet well understood. Here, the surface structure of a Zn-metal anode is reconstructed with Sn-crystal textures via a facile chemical displacement reaction. Compared to the bare Zn, the high-affinity Zn binding sites of Sn afford lower deposition energy barrier, which promotes deposition kinetics. What is more, a Sn-textured surface with moderate Zn affinity but high average surface energy ensures a better wettability from the deposits, leading to the lateral growth of Zn crystals. The resultant Sn-textured Zn-metal anode exhibits an extremely low voltage hysteresis of 20 mV and achieves a prolonged cycling stability over 500 h cycles without dendrite formation. This work provides new insights into the crystal-texture-dependent Zn electrodeposition process and offers direction for direct surface texturing to better stabilize Zn-metal anodes with improved reversibility.
锌金属阳极形成不均匀或树枝状电沉积物的倾向与电极表面的性质密切相关。然而，表面结构对锌固有成核和沉积的影响尚未得到充分理解。在此，通过一种简便的化学置换反应，用锡晶体纹理重构了锌金属阳极的表面结构。与裸锌相比，锡的高亲和力锌结合位点提供了更低的沉积能垒，从而促进了沉积动力学。此外，具有适度锌亲和力但高平均表面能的锡纹理表面确保了沉积物具有更好的润湿性，导致锌晶体的横向生长。所得的具有锡纹理的锌金属阳极表现出极低的20 mV电压滞后，并在500个循环中实现了延长的循环稳定性，且无树枝状晶体形成。这项工作为依赖晶体纹理的锌电沉积过程提供了新的见解，并为直接表面纹理化提供了方向，以更好地稳定具有改善可逆性的锌金属阳极。
