Hubei Engineering Center of Natural Polymers-based Medical Materials, Key Laboratory of Biomedical Polymers of Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202217833. doi: 10.1002/anie.202217833. Epub 2023 Feb 17.
Zinc (Zn) metal anode suffers from uncontrollable Zn dendrites and parasitic side reactions at the interface, which restrict the practical application of aqueous rechargeable zinc batteries (ARZBs). Herein, an amphoteric cellulose-based double-network is introduced as hydrogel electrolyte to overcome these obstacles. On one hand, the amphoteric groups build anion/cation transport channels to regulate electro-deposition behavior on Zn (002) crystal plane enabled by homogenizing Zn ions flux. On the other hand, the strong bonding between negatively charged carboxyl groups and Zn ions promote the desolvation process of [Zn(H O) ] to eliminate side reactions. Based on the above two functions, the hydrogel electrolyte enables an ultra-stable cycling with a cumulative capacity of 7 Ah cm at 20 mA cm /20 mAh cm for Zn||Zn cell. This work provides significant concepts for developing hydrogel electrolytes to realize stable anode for high-performance ARZBs.
锌（Zn）金属阳极会遭受不可控的 Zn 枝晶和界面处的寄生副反应的影响，这限制了水系可充电锌电池（ARZBs）的实际应用。在此，引入两性纤维素基双网络作为水凝胶电解质来克服这些障碍。一方面，两性基团构建阴离子/阳离子传输通道，通过均匀化 Zn 离子通量来调节 Zn（002）晶面的电沉积行为。另一方面，带负电荷的羧基基团与 Zn 离子之间的强键合促进了 [Zn（H₂O）₆] 的去溶剂化过程，从而消除了副反应。基于这两个功能，水凝胶电解质使 Zn||Zn 电池在 20 mA·cm /20 mAh·cm 下具有 7 Ah·cm 的超稳定循环累积容量。这项工作为开发水凝胶电解质以实现高性能 ARZBs 的稳定阳极提供了重要概念。
