Zhang Ying, Peng Chi, Zeng Zhi, Zhang Xiangni, Zhang Lulu, Ma Yue, Wang Zhaohui
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China.
College of Electrical Engineering & New Energy, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China.
ACS Appl Mater Interfaces. 2022 Mar 2;14(8):10419-10427. doi: 10.1021/acsami.1c24288. Epub 2022 Feb 18.
Although aqueous zinc-ion batteries (AZIBs) promise high capacity, low cost, and environmental friendliness, the Zn metal anode suffers from limited reversibility and unsatisfied lifespan arising from severe dendritic growth and inevitable interfacial corrosion. In this regard, constructing the artificial protective interfacial layer on the Zn metal foil has been recognized as an effective strategy to realize durable AZIBs. Inspired by the phytic acid (PA) anticorrosion conversion coating layer for industrial metal protection, herein, we designed a dense and conformal PA-Zn complex layer on the Zn anodes through a feasible, rapid wet-chemistry chelating reaction. The in situ formed uniform PA-Zn coating layer on the surface of Zn anodes can serve as a protective layer inhibiting corrosion reaction. More importantly, the desolvation energy of Zn is effectively reduced by the PA-Zn layer, which gives rise to enhanced kinetics of Zn plating/stripping for uniform Zn deposition. Consequently, the PA-Zn metal anode delivered a low overpotential of 36 mV and a long lifespan over 1400 h at 2 mA cm with a capacity of 1 mA h cm. The feasibility of PA-Zn anodes is also verified in the as-constructed PANI@VO||Zn full cells. This work paves the way for designing a multifunctional interface layer on Zn metal and promotes the development of high-performance AZIBs.
尽管水系锌离子电池（AZIBs）具有高容量、低成本和环境友好等优点，但锌金属负极存在严重的枝晶生长和不可避免的界面腐蚀问题，导致其可逆性有限且寿命不理想。在这方面，在锌金属箔上构建人工保护界面层已被认为是实现耐用型AZIBs的有效策略。受用于工业金属保护的植酸（PA）防腐转化涂层的启发，在此，我们通过一种可行的快速湿化学螯合反应，在锌负极上设计了一层致密且 conformal 的PA-Zn复合层。在锌负极表面原位形成的均匀PA-Zn涂层可作为抑制腐蚀反应的保护层。更重要的是，PA-Zn层有效降低了锌的去溶剂化能，从而增强了锌电镀/剥离的动力学，实现了锌的均匀沉积。因此，PA-Zn金属负极在2 mA cm 、容量为1 mA h cm 时，过电位低至36 mV，寿命长达1400 h以上。PA-Zn负极在构建的聚苯胺@VO||Zn全电池中的可行性也得到了验证。这项工作为在锌金属上设计多功能界面层铺平了道路，并推动了高性能AZIBs的发展。
