Issue 36, 2024

Reinforcing an interfacial molecular dam through a multifunctional organic electrolyte additive for stable Zn anodes

Abstract

The durability of aqueous zinc-ion batteries (AZIBs) is still impeded due to issues such as dendrite growth, byproduct formation and hydrogen evolution reactions in Zn metal anodes. Herein, we proposed a polydentate ligand, triazole (Ta), as an effective electrolyte additive to prolong the anode stability by its selective adsorption preference and enhanced zinc ion coordination and proton buffering ability. Specifically, Ta induces the formation of an interfacial molecular dam that not only mitigates corrosion via the H2O-deficient electric double-layer (EDL) but also facilitates uniform Zn deposition through its large conjugated planes and zincophilic properties. As a result, a symmetrical cell with the Ta additive exhibits a highly reversible cycle life for 2200 h at 1 mA cm−2 with a capacity of 1 mA h cm−2. Notably, using the Ta/ZnSO4 electrolyte enables stable cycling for 400 h at a high depth-of-discharge (DOD) level of 85%, leading to improved performance in the Zn//α-MnO2 full cell with a lifetime of over 2000 cycles.

Graphical abstract: Reinforcing an interfacial molecular dam through a multifunctional organic electrolyte additive for stable Zn anodes

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Article information

Article type
Paper
Submitted
27 jun 2024
Accepted
05 aug 2024
First published
06 aug 2024

J. Mater. Chem. A, 2024,12, 24226-24236

Reinforcing an interfacial molecular dam through a multifunctional organic electrolyte additive for stable Zn anodes

Z. Lin, Y. Zhang, X. Lin, H. Ding, M. Ye, Z. Wen, Y. Tang, X. Liu and C. C. Li, J. Mater. Chem. A, 2024, 12, 24226 DOI: 10.1039/D4TA04446K

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