Bi₂S₃ for Aqueous Zn Ion Battery with Enhanced Cycle Stability.

ABSTRACT: Aqueous Zn ion batteries (ZIBs) are promising in energy storage due to the low cost, high safety, and material abundance. The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O^2- and Zn²⁺ which leads to poor cyclic stability. Herein, Bi₂S₃ is proposed as a promising cathode material for rechargeable aqueous ZIBs. Improved cyclic stability and fast diffusion of Zn²⁺ is observed. Also, the layered structure of Bi₂S₃ with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn²⁺. As a result, the Zn/Bi₂S₃ battery delivers high capacity of 161 mAh g^-1 at 0.2 A g^-1 and good cycling stability up to 100 cycles with ca. 100% retention. The battery also demonstrates good cyclic performance of ca. 80.3% over 2000 cycles at 1 A g^-1. The storage mechanism in the Bi₂S₃ cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive contribution. This work indicates that Bi₂S₃ shows great potential as the cathode of ZIBs with good performance and stability.

SUBMITTER: Xiong T 

PROVIDER: S-EPMC7770836 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature