Qiao Liteng, Zhang Pengfei, Yu Yuanze, Jia Xu, Song Hongjiang, Zhong Shengkui, Liu Jie
College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong, 266042, P. R. China.
College of Marine Science and Technology, Hainan Tropical Ocean University, Sanya, Hainan, 572022, P. R. China.
Chemistry. 2024 Aug 1;30(43):e202401693. doi: 10.1002/chem.202401693. Epub 2024 Jul 15.
The serious dendrite growth and HO-induced side reactions on the Zn electrode lead to a significant fading in the cycling performance, hindering the development of commercial applications of aqueous Zn-ion batteries (AZIBs). Herein, a novel bifunctional network coating of dynamically cross-linking sodium alginate with trehalose has been rationally constructed on the Zn anode (Zn@AT). Firstly, the AT coating possesses abundant zinophilic oxygen-containing functional groups, which are able to induce uniform Zn ion flux. Secondly, the AT coating as a solid barrier can effectively inhibit HO-induced side reactions by lowering the activity of HO molecules. More specially, based on the dynamic cross-linking, AT network coating is endowed with self-healing capacity during cycling for durable battery operation. Consequentially, Zn@AT anodes in symmetric cells can cycle stably for 2787 h at 2 mA cm/2 mAh cm, and even achieve a significantly long cycle performance of 1087 h at large charge/discharge depths of 10 mA cm/10 mAh cm. Moreover, the Zn@AT//MnO full cell shows excellent specific capacity of 175 mAh g after 400 cycles. This study lights an effective strategy to enhance the durability of Zn electrodes in AZIBs.
锌电极上严重的枝晶生长和羟基诱导的副反应导致循环性能显著衰退，阻碍了水系锌离子电池（AZIBs）商业应用的发展。在此，一种将海藻酸钠与海藻糖动态交联的新型双功能网络涂层已被合理构建在锌负极上（Zn@AT）。首先，AT涂层具有丰富的亲锌含氧官能团，能够诱导均匀的锌离子通量。其次，AT涂层作为固体屏障，可以通过降低羟基分子的活性有效抑制羟基诱导的副反应。更特别的是，基于动态交联，AT网络涂层在循环过程中具有自愈能力，以实现电池的持久运行。因此，对称电池中的Zn@AT负极在2 mA cm/2 mAh cm下可稳定循环2787小时，甚至在10 mA cm/10 mAh cm的大充放电深度下实现长达1087小时的显著长循环性能。此外，Zn@AT//MnO全电池在400次循环后显示出175 mAh g的优异比容量。本研究为提高AZIBs中锌电极的耐久性提供了一种有效策略。
