Ding Jingyi, Liu Ying, Huang Shizhi, Wang Xusheng, Yang Junfeng, Wang Lijuan, Xue Mianqi, Zhang Xinxiang, Chen Jitao
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Ji'nan 250021, China.
ACS Appl Mater Interfaces. 2021 Jun 30;13(25):29746-29754. doi: 10.1021/acsami.1c08286. Epub 2021 Jun 15.
Aqueous zinc (Zn)-ion batteries are considered very promising in grid-scale energy storage systems. However, the dendrite, corrosion, and H evolution issues of Zn anode have restricted their further applications. Herein, to solve these issues, a hydrophilic layer, consisting of a covalent organic polymer (COP) and carboxylmethyl cellulose (CMC), is designed to construct a multifunctional quasi-gel (COP-CMC/QG) interface between Zn metal and the electrolyte. The COP-CMC/QG interface can significantly improve the rechargeability of the Zn anode through enhancing Zn transport kinetics, guiding uniform nucleation, and suppressing Zn corrosion and H evolution. As a result, the COP-CMC-Zn anode exhibits a reduced overpotential (12 mV at 0.25 mA cm), prolonged cycle life (over 4000 h at 0.25 mA cm and 2000 h at 5 mA cm in symmetrical cells), and elevated full-cell (Zn/MnO) performance. This work provides an efficient approach to achieve long-life Zn metal anodes and paves the way toward high-performance Zn-based and other metal-ion batteries.
水系锌离子电池在大规模储能系统中被认为非常有前景。然而，锌负极的枝晶、腐蚀和析氢问题限制了它们的进一步应用。在此，为了解决这些问题，设计了一种由共价有机聚合物（COP）和羧甲基纤维素（CMC）组成的亲水性层，以在锌金属和电解质之间构建多功能准凝胶（COP-CMC/QG）界面。COP-CMC/QG界面可以通过增强锌传输动力学、引导均匀成核以及抑制锌腐蚀和析氢来显著提高锌负极的可再充电性。结果，COP-CMC-Zn负极表现出降低的过电位（在0.25 mA cm时为12 mV）、延长的循环寿命（在对称电池中，在0.25 mA cm时超过4000 h，在5 mA cm时超过2000 h）以及提升的全电池（Zn/MnO）性能。这项工作提供了一种实现长寿命锌金属负极的有效方法，并为高性能锌基及其他金属离子电池铺平了道路。
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