Issue 43, 2021

High-performance dual-ion Zn batteries enabled by a polyzwitterionic hydrogel electrolyte with regulated anion/cation transport and suppressed Zn dendrite growth

Abstract

The rechargeable aqueous Zn battery is promising for next-generation wearable energy storage devices, due to its outstanding safety and low cost. Herein, we report a high-performance dual-ion Zn battery with both cations and anions hosted in the polyaniline (PANI) cathode. Of special interest is that a polyzwitterionic hydrogel electrolyte is specifically designed to regulate both the anion and cation transport, which originates from the strong electrostatic interaction between polyzwitterions with counter free ions. The ion-conducting and mechanical properties are then optimized by adjusting the polyzwitterionic content in the hydrogel networks. The intrinsic regulated anion/cation transport channels result in stable and uniform plating/stripping behaviors of the Zn metal anode, and meanwhile promote the cation/anion hosting reaction in the PANI cathode. These synergistic effects provide the Zn/PANI battery with excellent electrochemical performances, achieving a capacity of 102.5 mA h g−1 and a high retention rate of 87.5% after 600 cycles at 5 A g−1. Furthermore, a solid-state pouch cell is prepared for wearable devices with demonstrated excellent electrochemical performances, high flexibility and safety.

Graphical abstract: High-performance dual-ion Zn batteries enabled by a polyzwitterionic hydrogel electrolyte with regulated anion/cation transport and suppressed Zn dendrite growth

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
22 Sep 2021
Accepted
14 Oct 2021
First published
14 Oct 2021

J. Mater. Chem. A, 2021,9, 24325-24335

High-performance dual-ion Zn batteries enabled by a polyzwitterionic hydrogel electrolyte with regulated anion/cation transport and suppressed Zn dendrite growth

L. Li, L. Zhang, W. Guo, C. Chang, J. Wang, Z. Cong and X. Pu, J. Mater. Chem. A, 2021, 9, 24325 DOI: 10.1039/D1TA08127F

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