J. Mater. Sci. Technol. ›› 2025, Vol. 211: 53-61.DOI: 10.1016/j.jmst.2024.05.030

• Research Article • Previous Articles     Next Articles

Regulation of Zn2+ solvation shell by a novel N-methylacetamide based eutectic electrolyte toward high-performance zinc-ion batteries

Yong Liua,*,1, Kaijia Fenga,1, Junmei Hana,1, Fei Wangb, Yibo Xinga, Feng Taoa, Haoming Lia, Binrui Xuc,*, Jiangtao Jid,*, Hongxia Lie,*   

  1. aSchool of Materials Science and Engineering, Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Henan University of Science and Technology, Luoyang 471023, PR China;
    bFaculty of Engineering, Huanghe Science & Technology University, Zhengzhou 450063, PR China;
    cSchool of Information Engineering, Henan University of Science and Technology, Luoyang 471023, PR China;
    dCollege of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471023, PR China;
    eState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, PR China
  • Received:2023-11-30 Revised:2024-04-30 Accepted:2024-05-17 Published:2025-03-10 Online:2024-06-01
  • Contact: * E-mail addresses: liuyong209@haust.edu.cn (Y. Liu), 9906065@haust.edu.cn (B. Xu), jjt0907@163.com (J. Ji), lihongx0622@126.com (H. Li).
  • About author:1 These authors contributed equally to this work.

Abstract: Aqueous Zn-ion batteries (AZIBs) have been regarded as promising alternatives to Li-ion batteries due to their advantages, such as low cost, high safety, and environmental friendliness. However, AZIBs face significant challenges in limited stability and lifetime owing to zinc dendrite growth and serious side reactions caused by water molecules in the aqueous electrolyte during cycling. To address these issues, a new eutectic electrolyte based on Zn(ClO4)2·6H2O-N-methylacetamide (ZN) is proposed in this work. Compared with aqueous electrolyte, the ZN eutectic electrolyte containing organic N-methylacetamide could regulate the solvated structure of Zn2+, effectively suppressing zinc dendrite growth and side reactions. As a result, the Zn//NH4V4O10 full cell with the eutectic ZN-1-3 electrolyte demonstrates significantly enhanced cycling stability after 1000 cycles at 1 A g-1. Therefore, this study not only presents a new eutectic electrolyte for zinc-ion batteries but also provides a deep understanding of the influence of Zn2+ solvation structure on the cycle stability, contributing to the exploration of novel electrolytes for high-performance AZIBs.

Key words: Zinc-ion batteries, Eutectic electrolyte, Zn dendrites, Suppressed side reactions, Zn2+ solvation structure, Electrochemical performance