Issue 36, 2024

Graphene acid-enhanced interfacial layers with high Zn2+ ion selectivity and desolvation capability for corrosion-resistant Zn-metal anodes

Abstract

Utilizing an interfacial layer to stabilize Zn-metal anodes has been extensively explored, often accompanied by inhibition of Zn dendrites. However, most interfacial layers primarily delay Zn2+ ion transport/transfer, leading to slow Zn deposition due to the ion kinetics hindrance. Basically, this ionic hysteresis effect is inherent to all interfacial layers and will cause unstable Zn deposition over extended cycling periods. Here, we present a simple composite interfacial layer composed of graphene acid (GA) and cellulose nanofibers (CNFs). In the CNF/GA layer, a delicate balance between the rapid Zn2+ transport/transfer and uniform Zn deposition is achieved. The presence of GA not only demonstrates excellent ion selectivity and suppresses corrosion reactions, but also promotes Zn2+ transport/transfer, significantly reducing the desolvation energy of Zn2+ ions. Consequently, the symmetric cell with CNF/GA coatings achieves a highly stable cycling life of 2920 h, surpassing previous reports using graphene-based and CNF-based protecting layers. Moreover, the full cell based on the CNF/GA protected anodes exhibits excellent long-term stability and maintains an ultra-stable self-discharge retention of 99% after 24 h of standing. These findings provide valuable insights for the development of protective layers for Zn-metal anodes and future grid-scale Zn battery deployment.

Graphical abstract: Graphene acid-enhanced interfacial layers with high Zn2+ ion selectivity and desolvation capability for corrosion-resistant Zn-metal anodes

Supplementary files

Article information

Article type
Paper
Submitted
24 5 2024
Accepted
02 8 2024
First published
03 8 2024

J. Mater. Chem. A, 2024,12, 24175-24187

Graphene acid-enhanced interfacial layers with high Zn2+ ion selectivity and desolvation capability for corrosion-resistant Zn-metal anodes

K. Xia, L. Li, Y. Qiu, J. Weng, S. Shen, M. Chen, Y. Zhuang, Y. Wen, C. Yang, Z. Liu, M. Wu and Z. Zou, J. Mater. Chem. A, 2024, 12, 24175 DOI: 10.1039/D4TA03599B

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