Xie Chunlin, Liu Shengfang, Yang Zefang, Ji Huimin, Zhou Shuhan, Wu Hao, Hu Chao, Tang Yougen, Ji Xiaobo, Zhang Qi, Wang Haiyan
Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China.
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
Angew Chem Int Ed Engl. 2023 Apr 11;62(16):e202218612. doi: 10.1002/anie.202218612. Epub 2023 Feb 28.
Developing a highly stable and dendrite-free zinc anode is essential to the commercial application of zinc metal batteries. However, the understanding of zinc dendrites formation mechanism is still insufficient. Herein, for the first time, we discover that the interfacial heterogeneous deposition induced by lattice defects and epitaxial growth limited by residual stress are intrinsic and critical causes for zinc dendrite formation. Therefore, an annealing reconstruction strategy was proposed to eliminate lattice defects and stresses in zinc crystals, which achieve dense epitaxial electrodeposition of zinc anode. The as-prepared annealed zinc anodes exhibit dendrite-free morphology and enhanced electrochemical cycling stability. This work first proves that lattice defects and residual stresses are also very important factors for epitaxial electrodeposition of zinc in addition to crystal orientation, which can provide a new mechanism for future researches on zinc anode modification.
开发一种高度稳定且无枝晶的锌负极对于锌金属电池的商业应用至关重要。然而，目前对锌枝晶形成机制的理解仍不充分。在此，我们首次发现晶格缺陷引起的界面异质沉积和残余应力限制的外延生长是锌枝晶形成的内在关键原因。因此，提出了一种退火重构策略以消除锌晶体中的晶格缺陷和应力，从而实现锌负极的致密外延电沉积。所制备的退火锌负极呈现出无枝晶形态并具有增强的电化学循环稳定性。这项工作首次证明，除了晶体取向之外，晶格缺陷和残余应力对于锌的外延电沉积也是非常重要的因素，可为未来锌负极改性研究提供一种新机制。
