Yan Xiaoteng, Feng Xiaochen, Hao Boya, Liu Jiajun, Yu Yiren, Qi Junjie, Wang Honghai, Wang Zhiying, Hu Yuqi, Fan Xiaobin, Li Chunli, Liu Jiapeng
School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.
College of Environment and Chemical Engineering, Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, China.
J Colloid Interface Sci. 2022 Dec 15;628(Pt B):204-213. doi: 10.1016/j.jcis.2022.08.064. Epub 2022 Aug 12.
Aqueous zinc-ions batteries with low cost, reliable safety, high theoretical specific capacity and eco-friendliness have captured conspicuous attention in large-scale energy storage. However, the developed cathodes often suffer from low electrical conductivity and sluggish Zn diffusion kinetics, which severely hampers the development of aqueous zinc-ions batteries. Herein, we successfully prepare Mg/PANI/VO•nHO (MPVO) nanosheets through conducting polymers (polyaniline) and metal ions (Mg) co-intercalated strategy and systematically explore its electrochemical performance as cathode materials for aqueous zinc-ion batteries. Benefitting from the synergistic effect of polyaniline and Mg co-intercalated, the MPVO exhibits larger interlayer spacing and higher electrical conductivity than the single guest intercalation, which significantly enhances the electrochemical kinetics. As a consequence, the MPVO cathodes deliver superior specific capacity, rate capability and long-term cycling performance. Moreover, multiple characterizations and theoretical calculations are executed to expound the relevant mechanism.Therefore, this work provides a novel thought for the design of high-performance cathode materials for aqueous ZIBs.
具有低成本、可靠安全性、高理论比容量和环境友好性的水系锌离子电池在大规模储能领域引起了广泛关注。然而，已开发的正极材料往往存在电导率低和锌扩散动力学迟缓的问题，这严重阻碍了水系锌离子电池的发展。在此，我们通过导电聚合物（聚苯胺）和金属离子（镁）共插层策略成功制备了Mg/PANI/VO•nHO（MPVO）纳米片，并系统地研究了其作为水系锌离子电池正极材料的电化学性能。受益于聚苯胺和镁共插层的协同效应，MPVO表现出比单客体插层高的层间距和电导率，这显著增强了电化学动力学。因此，MPVO正极具有优异的比容量、倍率性能和长期循环性能。此外，还进行了多种表征和理论计算来阐明相关机理。因此，这项工作为水系锌离子电池高性能正极材料的设计提供了新思路。
