Nano-Micro Letters ›› 2024, Vol. 16 ›› Issue (1): 145-. doi: 10.1007/s40820-024-01361-0

• ARTICLE • Previous Articles     Next Articles

Critical Solvation Structures Arrested Active Molecules for Reversible Zn Electrochemistry

Junjie Zheng1,2, Bao Zhang3,*(), Xin Chen1,2, Wenyu Hao4, Jia Yao1,2, Jingying Li1,2, Yi Gan1,2, Xiaofang Wang1,2, Xingtai Liu1,2, Ziang Wu1,2, Youwei Liu1,2, Lin Lv1,2, Li Tao1,2, Pei Liang5, Xiao Ji4, Hao Wang1,2,*(), Houzhao Wan1,2,*()   

  1. 1 Hubei Yangtze Memory Laboratories, Wuhan, 430205, People’s Republic of China
    2 Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices, School of Microelectronics, Hubei University, Wuhan, 430062, People’s Republic of China
    3 School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
    4 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China
    5 Institute of Optoelectronics Technology, China Jiliang University, Hangzhou, 310018, People’s Republic of China
  • Received:2023-10-25 Accepted:2024-01-16 Online:2024-01-01 Published:2024-03-05
  • Contact: Bao Zhang, Hao Wang, Houzhao Wan

Abstract:

Aqueous Zn-ion batteries (AZIBs) have attracted increasing attention in next-generation energy storage systems due to their high safety and economic. Unfortunately, the side reactions, dendrites and hydrogen evolution effects at the zinc anode interface in aqueous electrolytes seriously hinder the application of aqueous zinc-ion batteries. Here, we report a critical solvation strategy to achieve reversible zinc electrochemistry by introducing a small polar molecule acetonitrile to form a “catcher” to arrest active molecules (bound water molecules). The stable solvation structure of [Zn(H2O)6]2+ is capable of maintaining and completely inhibiting free water molecules. When [Zn(H2O)6]2+ is partially desolvated in the Helmholtz outer layer, the separated active molecules will be arrested by the “catcher” formed by the strong hydrogen bond N-H bond, ensuring the stable desolvation of Zn2+. The Zn||Zn symmetric battery can stably cycle for 2250 h at 1 mAh cm−2, Zn||V6O13 full battery achieved a capacity retention rate of 99.2% after 10,000 cycles at 10 A g−1. This paper proposes a novel critical solvation strategy that paves the route for the construction of high-performance AZIBs.

Key words: Zinc-ion battery, Critical solvation, Helmholtz layer, Arrest active molecule, Reversible zinc anode