Nano-Micro Letters ›› 2024, Vol. 16 ›› Issue (1): 96-. doi: 10.1007/s40820-023-01312-1

• ARTICLE • Previous Articles     Next Articles

Ultrathin Zincophilic Interphase Regulated Electric Double Layer Enabling Highly Stable Aqueous Zinc-Ion Batteries

Yimei Chen1, Zhiping Deng1, Yongxiang Sun1, Yue Li1, Hao Zhang1, Ge Li2, Hongbo Zeng1(), Xiaolei Wang1()   

  1. 1 Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
    2 Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada
  • Received:2023-09-03 Accepted:2023-12-05 Online:2024-01-01 Published:2024-01-25
  • Contact: Hongbo Zeng, Xiaolei Wang

Abstract:

The practical application of aqueous zinc-ion batteries for large-grid scale systems is still hindered by uncontrolled zinc dendrite and side reactions. Regulating the electrical double layer via the electrode/electrolyte interface layer is an effective strategy to improve the stability of Zn anodes. Herein, we report an ultrathin zincophilic ZnS layer as a model regulator. At a given cycling current, the cell with Zn@ZnS electrode displays a lower potential drop over the Helmholtz layer (stern layer) and a suppressed diffuse layer, indicating the regulated charge distribution and decreased electric double layer repulsion force. Boosted zinc adsorption sites are also expected as proved by the enhanced electric double-layer capacitance. Consequently, the symmetric cell with the ZnS protection layer can stably cycle for around 3,000 h at 1 mA cm−2 with a lower overpotential of 25 mV. When coupled with an I2/AC cathode, the cell demonstrates a high rate performance of 160 mAh g−1 at 0.1 A g−1 and long cycling stability of over 10,000 cycles at 10 A g−1. The Zn||MnO2 also sustains both high capacity and long cycling stability of 130 mAh g−1 after 1,200 cycles at 0.5 A g−1.

Key words: Zinc anode, Electric double-layer regulation, Multifunction SEI layer, Inhibited side reactions and dendrite, Rapid kinetics