Work

A Self‐Recognition Separator for Ion Management to Customize Selective Zn 2+ Channels Toward Dendrite‐Free Zinc Metal Anodes

Year: 2025

Type: article

Abstract: ABSTRACT Aqueous zinc‐ion batteries (ZIBs) are promising candidates for next‐generation energy storage, but the problems related to Zn dendrites and side reactions severely hinder their practical applications. Herein, a self‐recognition separator based on a Bi‐based metal–organic framework (GF@CAU‐17) is developed for ion management to achieve highly reversible Zn anodes. The GF@CAU‐17 has self‐recognition behavior to customize selective Zn 2+ channels, effectively repelling SO 4 2– and H 2 O, but facilitating Zn 2+ conduction. The inherent properties of CAU‐17 result in the repulsion of SO 4 2– ions while disrupting the hydrogen bond network among free H 2 O molecules, restraining side reactions and by‐products. Simultaneously, the zincophilic characteristic of CAU‐17 expedites the desolvation of [Zn(H 2 O) 6 ] 2+ , leading to a self‐expedited Zn 2+ ion pumping effect that dynamically produces a steady and homogeneous Zn 2+ ion flux, and thereby alleviates concentration polarization. Consequently, a symmetric cell based on the GF@CAU‐17 separator can achieve a long lifespan of 4450 h. Moreover, the constructed Zn//GF@CAU‐17//MnO 2 cell delivers a high specific capacity of 221.8 mAh g −1 and 88.0% capacity retention after 2000 cycles.

Source: Carbon Energy

DOI: 10.1002/cey2.701