J. Mater. Sci. Technol. ›› 2025, Vol. 212: 251-258.DOI: 10.1016/j.jmst.2024.06.023

• Research Article • Previous Articles     Next Articles

High-performance zinc-ion hydrogel electrolytes based on molecular-level hybridization of PVA with polymer quantum dots

Jingyu Dua, Xiao Zhana, Yuhuan Xua, Kunlan Diaoa, Daohai Zhanga,*, Shuhao Qinb,*   

  1. aSchool of Chemical Engineering of Guizhou Minzu University, Guiyang 550025, China;
    bNational Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang 550014, China
  • Received:2024-05-21 Revised:2024-06-10 Accepted:2024-06-15 Published:2025-03-20 Online:2025-03-14
  • Contact: *E-mail addresses: zhangdaohai6235@163.com (D. Zhang), qinshuhao@126.com (S. Qin)

Abstract: Aqueous zinc ion batteries have received widespread attention. However, the growth of zinc dendrites and hydrogen evolution reaction generation seriously hinder the practical application of zinc ion bat-teries. Herein, it is reported that a multifunctional dendrites-free low-temperature PVA-based gel elec-trolyte by introducing negatively charged polymer carbon quantum dots (QDs) and the organic antifreeze dimethyl sulfoxide (DMSO) into it. The QDs carrying a large number of functional groups on the surface can effectively adsorb Zn2+, eliminating the “tip effect”, and inducing the uniform deposition of Zn2+ and the formation of a dendrites-free structure. Meanwhile, the solvation structure of adsorbed Zn2+ can be controlled by charged groups to reduce the generation of side reactions, thus obtaining high-performance zinc ion batteries. The Zn/polyaniline (PANi) full battery can be stably cycled more than 1000 times at-20 ℃, and the design of this gel electrolyte can provide good feasibility for safe, stable, and flexible energy storage devices.

Key words: Solid-state zinc-ion batteries, PVA-based hydrogel, Dendrite-free, Quantum dots