Journal Article

PUBDB-2023-07129

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synergistically Stabilizing Zinc Anodes by Molybdenum Dioxide Coating and Tween 80 Electrolyte Additive for High-Performance Aqueous Zinc-Ion Batteries

Thieu, N. A. ; Li, W. (Corresponding author) ; Chen, X. ; Li, Q. ; Wang, Q.Extern* ; Velayutham, M. ; Grady, Z. M. ; Li, X. ; Li, W. ; Khramtsov, V. V. ; Reed, D. M. ; Li, X. (Corresponding author)Extern* ; Liu, X. (Corresponding author)

2023
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsami.3c08474  doi:10.3204/PUBDB-2023-07129

Abstract: Recently, aqueous zinc-ion batteries (ZIBs) have become increasingly attractive as grid-scale energy storage solutions due to their safety, low cost, and environmental friendliness. However, severe dendrite growth, self-corrosion, hydrogen evolution, and irreversible side reactions occurring at Zn anodes often cause poor cyclability of ZIBs. This work develops a synergistic strategy to stabilize the Zn anode by introducing a molybdenum dioxide coating layer on Zn (MoO$_2$@Zn) and Tween 80 as an electrolyte additive. Due to the redox capability and high electrical conductivity of MoO$_2$, the coating layer can not only homogenize the surface electric field but also accommodate the Zn$^{2+}$ concentration field in the vicinity of the Zn anode, thereby regulating Zn$^{2+}$ ion distribution and inhibiting side reactions. MoO$_2$ coating can also significantly enhance surface hydrophilicity to improve the wetting of electrolyte on the Zn electrode. Meanwhile, Tween 80, a surfactant additive, acts as a corrosion inhibitor, preventing Zn corrosion and regulating Zn$^{2+}$ ion migration. Their combination can synergistically work to reduce the desolvation energy of hydrated Zn ions and stabilize the Zn anodes. Therefore, the symmetric cells of MoO$_2$@Zn∥MoO2@Zn with optimal 1 mM Tween 80 additive in 1 M ZnSO$_4$ achieve exceptional cyclability over 6000 h at 1 mA cm$^{-2}$ and stability (>700 h) even at a high current density (5 mA cm$^{-2}$). When coupling with the VO$_2$ cathode, the full cell of MoO$_2$@Zn∥VO$_2$ shows a higher capacity retention (82.4%) compared to Zn∥VO$_2$ (57.3%) after 1000 cycles at 5 A g$^{–1}$. This study suggests a synergistic strategy of combining surface modification and electrolyte engineering to design high-performance ZIBs.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20221092 (I-20221092) (I-20221092)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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