Highly Crystalline Flower-Like Covalent-Organic Frameworks Enable Highly Stable Zinc Metal Anodes
ACS APPLIED ENERGY MATERIALS(2022)
摘要
Aqueous zinc (Zn) ion batteries with low cost and high safety are promising devices for grid energy storage; however, the Zn anode problems, including dendrite growth and parasitic side reactions, severely retard their practical implementation. Here, a two-dimensional covalentorganic framework (COF) coating is developed to address these issues. Under the regulation of an optimal modulator, the prepared COF (COF- H) containing rich alkynyl units in an AA-stacking mode not only features a flower-like structure but also exhibits high crystallinity, large surface area, and high stability in strong acid and base medium. Consequently, the Zn anode with this COF-based artificial interface layer greatly mitigates the surface corrosion and efficiently suppresses the growth of the Zn dendrite, which is mainly attributed to the homogeneous distribution of Zn2+ in uniform channels and strong affinity of electron-rich sites including alkynyl, ketone, and enamine groups in COF-H toward Zn2+. The resulting Zn anode endows the symmetric cell with a long cycling lifetime of over 900 h at 3 mA cm-2 and promotes the cyclability of the COF@ Zn||MnO2 full cell. This study provides insights into designing highly crystalline COFs and constructing a highly reversible Zn anode for advanced rechargeable aqueous Zn ion batteries.
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关键词
covalent-organic framework, zinc anode, zinc dendrite, artificial interface, high crystallinity
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