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Issue 5, 2021
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Ultra-long-life and highly reversible Zn metal anodes enabled by a desolvation and deanionization interface layer

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Abstract

The zinc metal anode in aqueous zinc-ion batteries (AZIBs) is considerably impeded by uncontrollable dendrite growth and intricately water-induced corrosion, leading to low Coulombic efficiency (CE) and limited lifespan. Herein, a bifunctional cellulose nanowhisker-graphene (CNG) membrane was constructed to mitigate these problems. Experimental analysis and molecular dynamics simulation reveal that the CNG membrane, functioning as a desolvation layer to preclude H2O molecules encountering the Zn anode, retards the water-induced corrosion reaction. This CNG layer with negative surface charges can simultaneously generate a deanionization shock by spreading cations but screening anions to obtain redirected Zn deposition parallel to the (0002)Zn plane. Furthermore, the flexible and toughened CNG membrane could withstand a strong tensile force (8.54 N) and a great puncture force (0.10 N) to favorably accommodate the Zn anode surface fluctuation during plating/stripping. Accordingly, CNG/Zn anode delivers an enhanced CE (99.4%) and a longer cycle life (āˆ¼5500 h), over 27 times that of a bare Zn anode. A full MnO2/graphene-CNG/Zn battery exhibits a high discharge capacity (307 mA h gāˆ’1) and maintains a high capacity retention of 87.8% at 5C after 5000 cycles.

Graphical abstract: Ultra-long-life and highly reversible Zn metal anodes enabled by a desolvation and deanionization interface layer

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Supplementary files

Article information


Submitted
14 Dec 2020
Accepted
12 Mar 2021
First published
17 Mar 2021

Energy Environ. Sci., 2021,14, 3120-3129
Article type
Paper

Ultra-long-life and highly reversible Zn metal anodes enabled by a desolvation and deanionization interface layer

X. Zhang, J. Li, D. Liu, M. Liu, T. Zhou, K. Qi, L. Shi, Y. Zhu and Y. Qian, Energy Environ. Sci., 2021, 14, 3120 DOI: 10.1039/D0EE03898A

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