J. Mater. Sci. Technol. ›› 2023, Vol. 164: 102-110.DOI: 10.1016/j.jmst.2023.04.023

• Research Article • Previous Articles     Next Articles

Realizing the highly reversible Zn2+ and Na+ dual ions storage in high-crystallinity nickel hexacyanoferrate microcubes for aqueous zinc-ion batteries

Kexuan Wanga,1, Zhu Xua,1, Heng Lia,b,*, Huibo Wanga, Mingzheng Gea, Jilei Liuc, Shengwen Lia, Zekun Hud, Mengyu Zhud, Yanyan Zhangd, Yuxin Tangd,*, Shi Chena,*   

  1. aInstitute of Applied Physics and Materials Engineering, University of Macau, Macau SAR 999078, China
    bState Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    cCollege of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China
    dCollege of Chemical Engineering, Fuzhou University, Fuzhou 350116, China
  • Received:2022-12-23 Revised:2023-03-29 Accepted:2023-04-16 Published:2023-11-20 Online:2023-11-15
  • Contact: *Institute of Applied Physics and Materials Engineering, University of Macau, Macau SAR 999078, China. E-mail addresses: liheng@mail.sic.ac.cn (H. Li), yxtang@fzu.edu.cn (Y. Tang), shichen@um.edu.mo (S. Chen).
  • About author:1These authors contributed equally to this work.

Abstract: Prussian blue analogues (PBAs) with the 3D open framework are regarded as promising cathode candidates for aqueous Zinc ion batteries (ZIBs). Among various PBAs, nickel hexacyanoferrate (NiHCF) has attracted considerable attention because of its high operating voltage and economic merit. However, the cyclability of NiHCF is unsatisfactory due to poor structural stability during Zn2+ ions insertion/deinsertion. Moreover, the ion storage mechanism of NiHCF in aqueous electrolytes has not been fully revealed yet. Herein, high-crystallinity NiHCF (HC-NiHCF) microcubes with improved structural stability and larger crystal plane spacing are synthesized. For the first time, highly reversible Zn2+ ions and Na+ ions co-insertion/extraction are achieved for the HC-NiHCF microcubes in mixed aqueous electrolyte, as evidenced by various observations including two separated discharge plateaus and sequential changes of Na 1s and Zn 2p signals in ex-situ X-ray photoelectron spectroscopy (XPS). As a result, a high specific capacity of 73.9 mAh g-1 is obtained for the HC-NiHCF microcubes at 0.1 A g-1, combined with enhanced cycle stability (75% vs. 16.4%) over 1000 cycles at 2 A g-1. The reversible Zn2+ ions and Na+ ions co-insertion in HC-NiHCF microcubes reveals a new ion storage mechanism of Ni-based PBAs in aqueous electrolytes.

Key words: Aqueous zinc-ion batteries, Prussian blue analogues, Ion storage mechanism, Dual ions storage, High crystallinity